Service Manual
20 Pages
Preview
Page 1
Normothermia System
Model 775 Warming Unit Service Manual
1 3M™ Bair Hugger™ Warming Unit Model 775 2 Appareil de réchauffement Bair Hugger™ 3M™, modèle 775 3 3M™ Bair Hugger™ Wärmeeinheit, Modell 775
Made in the USA by 3M Health Care 2510 Conway Ave. St. Paul, MN 55144 800-228-3957 | www.bairhugger.com 3M, BAIR HUGGER and the BAIR HUGGER logo are trademarks of 3M. Used under license in Canada. © 2016, 3M. All rights reserved. Issue Date: 2016-08 34-8718-8817-7
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3M Deutschland GmbH Health Care Business Carl-Schurz-Str. 1 41453 Neuss Germany
Normothermia System
Model 775 Warming Unit Service Manual
1 English...1 2 Français ... 19 3 Deutsch ... 39
4394547 Description: 3M TM Bair Hugger™ Patient Adjustable Warming Unit Service Manual Base File Name: PA: 34871888177.indb GA: Software: InDesign CC 2014 - BOOK SGS Contact: Email: Printer: Printer Location: Supplier:
PROCESS BLACK
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PMS 280
3
Item Spec#: 34-8718-8817-7 Supersedes#:
08.04.16 New Build
kmh
08.26.16 Changes per RA proof report.
TN
Structure#:
09.15.16 Final release.
DJ
Cat/Product#:Model 775 Reference: Requester: Frank Boeshart/Debra Staack Die # / Doc. Size: 8.5" x 11"
1 Table of Contents Introduction... 3 Description of the 3M™ Bair Hugger™ Temperature Management System ... 3 Indications... 3 Definition of Symbols ... 3 Explanation of Signal Word Consequences... 4 CONTRAINDICATION: ... 4 WARNING: ... 4 CAUTION: ... 4 NOTICE: ... 4 Proper Use and Maintenance... 5 Read Before Servicing Equipment ... 5 Safety Inspection ... 5 Warming Unit Overview... 5 Warming Unit Power-On-Reset... 6 Temperature Modes ... 6 Airflow Modes ... 6 Standby Mode... 6 Fault Conditions... 6 Over-Temperature Condition... 6 Alternative Modes... 6 Accessing the Alternative Modes...7 Exiting an Alternative Mode...7 Required Preventative Maintenance ...7 Calibrating the Operating Temperature ...7 Testing the Over-Temperature Detection System... 8 Viewing the Fault Code Log... 8 Clearing the Fault Code Log ... 8 Fault Code Table... 9 Viewing the Hour Meter ... 9 Viewing the Operating Timer ... 9 Replacing the Air Filter... 9 Replacing the Hose ... 9 Detaching Warming Unit Hose ... 9 Reattaching Warming Unit Hose ...10 Replacing the Fuses ...10 Disassembling the Warming Unit ...10 Reassembling the Warming Unit ...10 Cleaning, Maintenance and Storage ...11 Troubleshooting...11 Technical Support and Order Placement ...12 Specifications...13 Maintenance Log... 17
GB / 34-8718-8817-7
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1
1 3M™ Bair Hugger™ Warming Unit Model 775 Service Manual Please forward to Biomedical Engineering Department
Manufacturer
Introduction Description of the 3M™ Bair Hugger™ Temperature Management System The 3M™ Bair Hugger™ temperature management system consists of a Model 775 warming unit (with optional rolling stand, and other accessories) along with a 3M warming blanket, Bair Hugger warming gown, or the 3M™ Ranger™ 241 blood/fluid warming set. The Bair Hugger warming unit is attached to the warming blanket or warming gown by means of a flexible hose. Warm air is generated in the warming unit and flows through the warming unit hose and into the blanket or gown. Depending on the model, the 3M blanket or gown is placed either around, over, or underneath the patient. Small perforations on the blanket or gown allow the warm air to be dispersed over the patient. For blood/fluid warming applications, the Model 241 blood/fluid warming set is inserted in the warming unit hose. When the warming unit is turned ON and a temperature setting is selected, warm air flows over the Model 241 tubing and warmed blood/fluid exits from the distal end of the tubing. For additional information on 3M blankets, gowns, the 241 warming set, or other accessories visit us online at bairhugger.com. This manual includes operating and service instructions and warming unit specifications for the Model 775 warming unit. The warming unit can be used in all clinical settings where the patient may feel too warm or too cold. For information about using 3M blankets, gowns, or the 241 blood/ fluid warming set with the warming unit, refer to the respective Instructions for Use.
Indications The Bair Hugger temperature management system is intended to prevent and treat hypothermia. In addition, the temperature management system can be used to provide patient thermal comfort when conditions exist that may cause patients to feel too warm or too cold. The temperature management system can be used with adult and pediatric patients. •
The Bair Hugger temperature management system should only be used by trained medical professionals.
•
Federal law (USA) restricts this device to sale by or on the order of a licensed healthcare professional.
Voltage, alternating current (AC)
This system is subject to European WEEE Directive 2002/96/EC. This product contains electrical and electronic components and must not be disposed of using standard refuse collection. Please consult local directives for disposal of electrical and electronic equipment.
Protective earth ground
No free hosing
High fan setting
Low fan setting
Non-explosion proof
Consult instructions for use
Follow instructions for use
Definition of Symbols The following symbols may appear on the product’s labeling or exterior packaging. An equipotentiality plug (grounded) conductor other than a protective earth conductor or a neutral conductor, providing a direct connection between electrical equipment and the potential equalization busbar of the electrical installation. Please consult IEC 60601-1 for requirements.
Fuse
Type BF equipment (patient applied)
Recycle to avoid environmental contamination. This product contains recyclable parts. For information on recycling, please contact your nearest 3M Service Center for advice.
Attention; see instructions for use
Keep dry
Temperature limit
Date of manufacture
GB / 34-8718-8817-7
PDF Scaled at 75.0%
3
1 3M™ Bair Hugger™ Warming Unit Model 775 Service Manual Please forward to Biomedical Engineering Department
Manufacturer
Introduction Description of the 3M™ Bair Hugger™ Temperature Management System The 3M™ Bair Hugger™ temperature management system consists of a Model 775 warming unit (with optional rolling stand, and other accessories) along with a 3M warming blanket, Bair Hugger warming gown, or the 3M™ Ranger™ 241 blood/fluid warming set. The Bair Hugger warming unit is attached to the warming blanket or warming gown by means of a flexible hose. Warm air is generated in the warming unit and flows through the warming unit hose and into the blanket or gown. Depending on the model, the 3M blanket or gown is placed either around, over, or underneath the patient. Small perforations on the blanket or gown allow the warm air to be dispersed over the patient. For blood/fluid warming applications, the Model 241 blood/fluid warming set is inserted in the warming unit hose. When the warming unit is turned ON and a temperature setting is selected, warm air flows over the Model 241 tubing and warmed blood/fluid exits from the distal end of the tubing. For additional information on 3M blankets, gowns, the 241 warming set, or other accessories visit us online at bairhugger.com. This manual includes operating and service instructions and warming unit specifications for the Model 775 warming unit. The warming unit can be used in all clinical settings where the patient may feel too warm or too cold. For information about using 3M blankets, gowns, or the 241 blood/ fluid warming set with the warming unit, refer to the respective Instructions for Use.
Indications The Bair Hugger temperature management system is intended to prevent and treat hypothermia. In addition, the temperature management system can be used to provide patient thermal comfort when conditions exist that may cause patients to feel too warm or too cold. The temperature management system can be used with adult and pediatric patients. •
The Bair Hugger temperature management system should only be used by trained medical professionals.
•
Federal law (USA) restricts this device to sale by or on the order of a licensed healthcare professional.
Voltage, alternating current (AC)
This system is subject to European WEEE Directive 2002/96/EC. This product contains electrical and electronic components and must not be disposed of using standard refuse collection. Please consult local directives for disposal of electrical and electronic equipment.
Protective earth ground
No free hosing
High fan setting
Low fan setting
Non-explosion proof
Consult instructions for use
Follow instructions for use
Definition of Symbols The following symbols may appear on the product’s labeling or exterior packaging. An equipotentiality plug (grounded) conductor other than a protective earth conductor or a neutral conductor, providing a direct connection between electrical equipment and the potential equalization busbar of the electrical installation. Please consult IEC 60601-1 for requirements.
Fuse
Type BF equipment (patient applied)
Recycle to avoid environmental contamination. This product contains recyclable parts. For information on recycling, please contact your nearest 3M Service Center for advice.
Attention; see instructions for use
Keep dry
Temperature limit
Date of manufacture
GB / 34-8718-8817-7
PDF Scaled at 75.0%
3
Explanation of Signal Word Consequences
! WARNING:
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
! CAUTION:
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE: Indicates a situation which, if not avoided, could result in property damage only.
! CONTRAINDICATION: To reduce the risk of thermal injury: •
!
Do not apply heat to lower extremities during aortic cross-clamping. Thermal injury may occur if heat is applied to ischemic limbs.
WARNING: To reduce the risk of thermal injury: •
•
The Bair Hugger Model 775 warming unit has been designed to operate safely ONLY with 3M disposable warming products. Use with other products may cause thermal injury. To the full extent permitted by law, the manufacturer and/or importer declines all responsibility for thermal injury resulting from the warming unit being used in conjunction with non-3M products. Do not treat patients with the warming unit hose alone. Always attach the hose to a 3M warming blanket/gown before providing warming therapy.
•
Do not allow the patient to lie on the warming unit hose.
•
Do not allow the warming unit hose to directly contact the patient’s skin during warming therapy.
•
Do not leave neonates, infants, children and other vulnerable patient populations unattended during warming therapy.
•
Do not leave patients with poor perfusion unmonitored during prolonged warming therapy.
•
• •
•
Do not place the non-perforated side of the warming blanket/ gown on the patient. Always place the perforated side (with the small holes) directly on top of the patient in contact with the patient’s skin. Do not connect a torn or damaged blanket/gown to the warming unit. For over-body warming blankets and gowns; do not place patient securement device (i.e. safety strap or tape) over the warming blanket/gown. For underbody or side channel warming blankets; if a securement device (i.e. safety strap, tape) is used, en-sure the warming channels are not occluded.
•
Do not place the warming blanket/gown directly over a dispersive electrode pad.
•
Do not continue warming therapy if the red Over-temp indicator light illuminates and the alarm sounds. Unplug the warming unit and contact a qualified service technician.
•
Do not continue 241 blood/fluid warming therapy if the red Over-temp indicator light illuminates and the alarm sounds. Immediately stop fluid flow, and discard the blood/fluid warming set. Unplug the warming unit, and contact a qualified service technician.
•
For the Bair Hugger flex warming gown; ensure that the blood pressure cuff, ECG, IV or other lines or cords are not between the upper sleeve insert and the gown prior to deploying the upper sleeve warming insert(s), as this could result in tearing of the insert during deployment.
4
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•
!
Do not perform the over-temperature detection system test while the warming unit is being used for warming therapy.
! CAUTION: To reduce the risk of fire: •
WARNING: To reduce the risk of patient injury or death due to altered drug delivery: •
Do not use a warming blanket/gown over transdermal medication patches.
To reduce the risk of injury due to interference ! WARNING: with ventilation: •
3M warming blankets and gowns are classified as Class I Normal Flammability as defined by the Consumer Product Safety Commissions flammable fabric regulation, 16 CFR 1610. Follow standard safety protocols when using high intensity heat sources.
To reduce the risks of thermal injury, hyperthermia ! CAUTION: or hypothermia: •
Do not allow the warming blanket/gown or head drape to cover the patient’s head or airway when the patient is not mechanically ventilated.
3M recommends continuously monitoring core temperature. In the absence of continuous monitoring, monitor the temperature of patients who are incapable of reacting, communicating and/or who cannot sense temperature a minimum of every 15 minutes or according to institutional protocol.
! WARNING: To reduce the risk of injury due to patient falls:
•
To reduce the risks associated with hazardous voltage ! WARNING: and fire:
Monitor cutaneous responses of patients who are incapable of reacting, communicating and/or who cannot sense temperature a minimum of every 15 minutes or according to institutional protocol.
•
Adjust air temperature or discontinue warming therapy when the therapeutic goal is reached, if elevated temperatures are recorded or if there is an adverse cutaneous response in the warmed area.
•
Do not place the warming unit on a soft uneven surface, such as a bed, or a visibly wet surface as the air in-take may become blocked and cause the warming unit to overheat, compromising the warming unit’s performance.
•
Perform all temperature testing of the warming unit with a 3M Model 22110 temperature test unit.
•
Do not use a warming blanket/gown to transfer or move the patient.
•
Keep power cord visible and accessible at all times. The plug on the power cord serves as the disconnect device.
•
Only connect to outlets marked “Hospital only,” “Hospital Grade,” or a reliable grounded outlet.
•
Use only the power cord specified for this product and certified for the country of use.
•
Do not allow the power cord to get wet.
•
Do not use the warming unit when it appears the unit, power cord or any component is damaged. Replace the warming unit. Contact 3M Technical Support.
•
Do not disassemble the warming unit unless you are a qualified service technician. There are electrically live parts within the warming unit when it is connected to a power source.
•
Connect each warming unit being tested to a separate power source.
To reduce the risk associated with electromagnetic ! CAUTION: interference (EMI) due to portable and mobile radio frequency (RF) communications equipment: •
The 3M Bair Hugger temperature management system has been tested to be resistant to both EMI and electro-static discharge (ESD).
•
Install and put into service the 3M Bair Hugger temperature management system according to the electromagnetic compatibility (EMC) information provided in the Guidance and Manufacturer’s Declaration.
! CAUTION: To reduce the risk of cross‑contamination: •
Except for specific Bair Hugger warming blanket models, 3M blankets/gowns are not sterile. Each warming blanket/gown is intended for single patient use ONLY. Placing a sheet between the warming blanket/gown and the patient does not prevent contamination of the product.
•
Clean the warming unit and the outside of the warming unit hose after each patient use. See “Cleaning Instructions” on page 11.
•
Follow applicable regulations when disposing of this warming unit or any of its electrical components.
•
•
Do not attempt to clean the air filter as it may be contaminated from use. Discard the filter in a manner consistent with institutional protocol. Do not operate the Bair Hugger warming unit with the hose detached from the 3M warming blanket/gown. The Bair Hugger warming unit is intended to be used with the hose properly attached to its corresponding warming blanket/gown and in accordance with good practices for operating room sterile technique.
! CAUTION: To reduce the risk of patient or caregiver injury: •
•
Should interference occur, move away from the portable or mobile RF communications equipment.
Proper Use and Maintenance 3M assumes no responsibility for the reliability, performance, or safety of the warming unit if the following events occur: •
Modifications or repairs are performed by unqualified personnel.
•
The warming unit is used in a manner other than that described in the Operator’s or Service Manuals.
•
The warming unit is installed in an environment that does not meet the appropriate electrical and grounding requirements.
•
The warming unit not maintained in accordance with the procedures described in the Service Manual.
Read Before Servicing Equipment All repair, calibration, and servicing of the warming unit require the skill of a qualified, medical equipment service technician who is familiar with good practice for medical device repair. If service does not require the manufacturer’s attention, the Model 775 Service Manual provides the technical information needed to service the warming unit. Perform all repairs and maintenance in accordance with the instructions in the Service Manual. For additional service information, please contact 3M technical support.
Safety Inspection Perform a safety inspection after making repairs to the warming unit and before returning the warming unit to service. A safety inspection should include calibrating the operating temperature settings and testing the over-temperature detection function as described in this service manual as well as testing for leakage current and continuity check on safety ground.
Warming Unit Overview When you connect the warming unit to a grounded power source, the warming unit automatically performs the power-on-reset operation described below. Following the power-on-reset operation, the warming unit will enter the Standby mode. You can select any operating mode by pressing the appropriate button on the warming unit control panel. See Figure 1. Alphanumeric Display Temperature Modes TEMPERATURE
MODEL
HIGH
775
43 C MEDIUM
2.
The Bair Hugger warming unit meets medical electronic interference requirements. If radio frequency interference with other equipment should occur, connect the warming unit to a different power source. To avoid warming unit damage: •
Use proper Electrostatic Discharge (ESD) procedures when performing maintenance.
•
Do not modify this equipment without authorization from the manufacturer.
•
Do not immerse the warming unit, warming unit parts or accessories in any liquid or subject them to any sterilization process.
•
Do not use cleaning solutions with greater than 80% alcohol or solvents, including acetone and thinner, to clean the warming unit or hose. Solvents may damage the labels and other plastic parts.
High Fan Setting Low Fan Setting
38 C
Notices 1.
AIR FLOW
LOW
32 C
TEMP IN RANGE
System
AMBIENT
FAULT OVER TEMP
STANDBY
Figure 1. MODEL 775 WARMING UNIT Control panel
If mounted on an IV pole, the distance from the bottom of the warming unit to the floor must be less than 44” (112 cm) and the IV pole wheelbase diameter must be at least 28” (71 cm) to prevent tipping.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
GB / 34-8718-8817-7
5
Explanation of Signal Word Consequences
! WARNING:
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
! CAUTION:
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE: Indicates a situation which, if not avoided, could result in property damage only.
! CONTRAINDICATION: To reduce the risk of thermal injury: •
!
Do not apply heat to lower extremities during aortic cross-clamping. Thermal injury may occur if heat is applied to ischemic limbs.
WARNING: To reduce the risk of thermal injury: •
•
The Bair Hugger Model 775 warming unit has been designed to operate safely ONLY with 3M disposable warming products. Use with other products may cause thermal injury. To the full extent permitted by law, the manufacturer and/or importer declines all responsibility for thermal injury resulting from the warming unit being used in conjunction with non-3M products. Do not treat patients with the warming unit hose alone. Always attach the hose to a 3M warming blanket/gown before providing warming therapy.
•
Do not allow the patient to lie on the warming unit hose.
•
Do not allow the warming unit hose to directly contact the patient’s skin during warming therapy.
•
Do not leave neonates, infants, children and other vulnerable patient populations unattended during warming therapy.
•
Do not leave patients with poor perfusion unmonitored during prolonged warming therapy.
•
• •
•
Do not place the non-perforated side of the warming blanket/ gown on the patient. Always place the perforated side (with the small holes) directly on top of the patient in contact with the patient’s skin. Do not connect a torn or damaged blanket/gown to the warming unit. For over-body warming blankets and gowns; do not place patient securement device (i.e. safety strap or tape) over the warming blanket/gown. For underbody or side channel warming blankets; if a securement device (i.e. safety strap, tape) is used, en-sure the warming channels are not occluded.
•
Do not place the warming blanket/gown directly over a dispersive electrode pad.
•
Do not continue warming therapy if the red Over-temp indicator light illuminates and the alarm sounds. Unplug the warming unit and contact a qualified service technician.
•
Do not continue 241 blood/fluid warming therapy if the red Over-temp indicator light illuminates and the alarm sounds. Immediately stop fluid flow, and discard the blood/fluid warming set. Unplug the warming unit, and contact a qualified service technician.
•
For the Bair Hugger flex warming gown; ensure that the blood pressure cuff, ECG, IV or other lines or cords are not between the upper sleeve insert and the gown prior to deploying the upper sleeve warming insert(s), as this could result in tearing of the insert during deployment.
4
PDF Scaled at 75.0%
•
!
Do not perform the over-temperature detection system test while the warming unit is being used for warming therapy.
! CAUTION: To reduce the risk of fire: •
WARNING: To reduce the risk of patient injury or death due to altered drug delivery: •
Do not use a warming blanket/gown over transdermal medication patches.
To reduce the risk of injury due to interference ! WARNING: with ventilation: •
3M warming blankets and gowns are classified as Class I Normal Flammability as defined by the Consumer Product Safety Commissions flammable fabric regulation, 16 CFR 1610. Follow standard safety protocols when using high intensity heat sources.
To reduce the risks of thermal injury, hyperthermia ! CAUTION: or hypothermia: •
Do not allow the warming blanket/gown or head drape to cover the patient’s head or airway when the patient is not mechanically ventilated.
3M recommends continuously monitoring core temperature. In the absence of continuous monitoring, monitor the temperature of patients who are incapable of reacting, communicating and/or who cannot sense temperature a minimum of every 15 minutes or according to institutional protocol.
! WARNING: To reduce the risk of injury due to patient falls:
•
To reduce the risks associated with hazardous voltage ! WARNING: and fire:
Monitor cutaneous responses of patients who are incapable of reacting, communicating and/or who cannot sense temperature a minimum of every 15 minutes or according to institutional protocol.
•
Adjust air temperature or discontinue warming therapy when the therapeutic goal is reached, if elevated temperatures are recorded or if there is an adverse cutaneous response in the warmed area.
•
Do not place the warming unit on a soft uneven surface, such as a bed, or a visibly wet surface as the air in-take may become blocked and cause the warming unit to overheat, compromising the warming unit’s performance.
•
Perform all temperature testing of the warming unit with a 3M Model 22110 temperature test unit.
•
Do not use a warming blanket/gown to transfer or move the patient.
•
Keep power cord visible and accessible at all times. The plug on the power cord serves as the disconnect device.
•
Only connect to outlets marked “Hospital only,” “Hospital Grade,” or a reliable grounded outlet.
•
Use only the power cord specified for this product and certified for the country of use.
•
Do not allow the power cord to get wet.
•
Do not use the warming unit when it appears the unit, power cord or any component is damaged. Replace the warming unit. Contact 3M Technical Support.
•
Do not disassemble the warming unit unless you are a qualified service technician. There are electrically live parts within the warming unit when it is connected to a power source.
•
Connect each warming unit being tested to a separate power source.
To reduce the risk associated with electromagnetic ! CAUTION: interference (EMI) due to portable and mobile radio frequency (RF) communications equipment: •
The 3M Bair Hugger temperature management system has been tested to be resistant to both EMI and electro-static discharge (ESD).
•
Install and put into service the 3M Bair Hugger temperature management system according to the electromagnetic compatibility (EMC) information provided in the Guidance and Manufacturer’s Declaration.
! CAUTION: To reduce the risk of cross‑contamination: •
Except for specific Bair Hugger warming blanket models, 3M blankets/gowns are not sterile. Each warming blanket/gown is intended for single patient use ONLY. Placing a sheet between the warming blanket/gown and the patient does not prevent contamination of the product.
•
Clean the warming unit and the outside of the warming unit hose after each patient use. See “Cleaning Instructions” on page 11.
•
Follow applicable regulations when disposing of this warming unit or any of its electrical components.
•
•
Do not attempt to clean the air filter as it may be contaminated from use. Discard the filter in a manner consistent with institutional protocol. Do not operate the Bair Hugger warming unit with the hose detached from the 3M warming blanket/gown. The Bair Hugger warming unit is intended to be used with the hose properly attached to its corresponding warming blanket/gown and in accordance with good practices for operating room sterile technique.
! CAUTION: To reduce the risk of patient or caregiver injury: •
•
Should interference occur, move away from the portable or mobile RF communications equipment.
Proper Use and Maintenance 3M assumes no responsibility for the reliability, performance, or safety of the warming unit if the following events occur: •
Modifications or repairs are performed by unqualified personnel.
•
The warming unit is used in a manner other than that described in the Operator’s or Service Manuals.
•
The warming unit is installed in an environment that does not meet the appropriate electrical and grounding requirements.
•
The warming unit not maintained in accordance with the procedures described in the Service Manual.
Read Before Servicing Equipment All repair, calibration, and servicing of the warming unit require the skill of a qualified, medical equipment service technician who is familiar with good practice for medical device repair. If service does not require the manufacturer’s attention, the Model 775 Service Manual provides the technical information needed to service the warming unit. Perform all repairs and maintenance in accordance with the instructions in the Service Manual. For additional service information, please contact 3M technical support.
Safety Inspection Perform a safety inspection after making repairs to the warming unit and before returning the warming unit to service. A safety inspection should include calibrating the operating temperature settings and testing the over-temperature detection function as described in this service manual as well as testing for leakage current and continuity check on safety ground.
Warming Unit Overview When you connect the warming unit to a grounded power source, the warming unit automatically performs the power-on-reset operation described below. Following the power-on-reset operation, the warming unit will enter the Standby mode. You can select any operating mode by pressing the appropriate button on the warming unit control panel. See Figure 1. Alphanumeric Display Temperature Modes TEMPERATURE
MODEL
HIGH
775
43 C MEDIUM
2.
The Bair Hugger warming unit meets medical electronic interference requirements. If radio frequency interference with other equipment should occur, connect the warming unit to a different power source. To avoid warming unit damage: •
Use proper Electrostatic Discharge (ESD) procedures when performing maintenance.
•
Do not modify this equipment without authorization from the manufacturer.
•
Do not immerse the warming unit, warming unit parts or accessories in any liquid or subject them to any sterilization process.
•
Do not use cleaning solutions with greater than 80% alcohol or solvents, including acetone and thinner, to clean the warming unit or hose. Solvents may damage the labels and other plastic parts.
High Fan Setting Low Fan Setting
38 C
Notices 1.
AIR FLOW
LOW
32 C
TEMP IN RANGE
System
AMBIENT
FAULT OVER TEMP
STANDBY
Figure 1. MODEL 775 WARMING UNIT Control panel
If mounted on an IV pole, the distance from the bottom of the warming unit to the floor must be less than 44” (112 cm) and the IV pole wheelbase diameter must be at least 28” (71 cm) to prevent tipping.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
GB / 34-8718-8817-7
5
Warming Unit Power‑On‑Reset
Fault Conditions
The warming unit automatically performs the following power-on-reset sequence after you connect the warming unit to a properly grounded power source (See Figure 1):
The warming unit software recognizes several nonhazardous fault conditions including:
•
Performs all self-test functions.
•
Illuminates indicator lights and all pixels in the alphanumeric display momentarily.
•
Sensor failures
•
Heater failures
•
Computer failure Software failure
To access the alternative modes, you must press the Alternative Mode button that is located on the front panel of the warming unit but is unlabeled. Press the center of the Bair Hugger logo when the instructions direct you to press the Alternative Mode button.
•
Displays the text “MD 700’s” and the software revision level in the alphanumeric display.
•
Keypad failure
•
Sounds the alarm (three low-level clicks).
•
Power supply failure
•
Enters the Standby mode with the high fan setting selected by default.
•
Blower motor failure
•
Forced over-temperature test failure
If the warming unit loses power for less than 1 second, the warming unit software will return the warming unit to the operating mode you selected prior to the power loss. However, if the warming unit loses power for longer than 1 second, the warming unit software will reset when you restore power. The warming unit will then enter the Standby mode with the high fan setting selected by default.
Temperature Modes The warming unit has 4 operating modes: Ambient, 32°C, 38°C, 43°C.
•
Audible alarm sounds.
•
Blower and heater turn off.
•
Fault code appears in the alphanumeric display.
•
Up to 5 fault codes are stored in memory.
TEMPERATURE MODE
Over‑Temperature Condition
32°C ± 1.5°C
38°C
38°C ± 1.5°C
43°C Ambient
When an over temperature condition exists, the following events occur: •
Over‑temp indicator light flashes.
43°C ± 1.5°C
•
Audible alarm sounds.
Warming unit will supply air at room temperature
•
Blower, heater, and operating mode indicator lights automatically turn off.
•
Fault code appears in the alphanumeric display (see page 9).
After you select a temperature mode, the following events occur: •
Corresponding temperature indicator light illuminates.
When the audible alarm sounds, press any button on the keypad to silence it. The warming unit must be unplugged before it can be restarted.
•
Blower operates at selected fan speed.
Alternative Modes
•
Heater activates except in Ambient mode.
•
Temperature mode timer and hour meter activate.
The warming unit has 5 alternative modes that allow access to the service and calibration utilities of the warming unit (see Figure 2 on page 7).
•
Temperature at the blanket-end of the hose appears in the alphanumeric display.
•
Temp in Range indicator light illuminates when the temperature at the blanket end of the hose is within ±1.5°C of the selected setting; this indicator light does not illuminate in the Ambient mode.
Airflow Modes The warming unit has two preset fan speed settings: a default or high fan setting ( ) and a reduced or low fan setting ( ). The warming unit will reset/default to the high fan setting each time the warming unit is powered up or Standby is selected. The low fan setting ( ) may be preselected while in Standby prior to selecting the desired temperature.
Standby Mode To place the warming unit in Standby mode, press the Standby button. When in Standby mode, the following events occur: •
Standby indicator light illuminates.
•
Blower and heater are turned OFF.
•
Alphanumeric display deactivates.
•
Alarm and fault detection functions remain active.
•
Operating timer pauses.
•
Airflow mode resets/defaults to the high fan setting.
6
PDF Scaled at 75.0%
HIGH
775
43 C
AIR FLOW
System Information AltMode3
MEDIUM
38 C
LOW
When the audible alarm sounds, press any button on the keypad to silence it. The warming unit must be unplugged before it can be restarted. See “Viewing the Fault Code Log” on page 8 and the “Fault Code Table” on page 9 for more information about specific fault codes.
32°C
MODEL
Fault indicator light flashes.
To select the 32°C, 38°C, 43°C, or Ambient mode, press the corresponding button. The warming unit will operate within the specified temperature range, shown in the table below. TEMPERATURE OF DELIVERED AIR
Over‑temperature Detection Test AltMode4
TEMPERATURE
When a fault condition exists, the following events occur: •
The Over‑temperature Detection Test mode allows the user to test the operation of the independent over-temperature shutdown system.
32 C
Fault Code Log AltMode2
TEMP IN RANGE
System
•
The Model 22110 temperature test unit simulates the operating characteristics of 3M warming blankets and gowns when used with Bair Hugger warming units.
•
When using the Model 22110 temperature test unit, take temperature readings using a calibrated thermometer that can accept a male, subminiature connector and read a “K” style thermocouple (e.g., a Fluke Model 52 K/J Thermometer). If the test unit connector does not fit your thermometer, remove the connector from the test unit and attach a connector that fits your meter. Be certain to observe polarity.
OVER TEMP
Alternative Mode button AltMode0
2.
Connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode.
3.
Press the Ambient button to place the warming unit in Ambient mode. Allow the warming unit to run in Ambient mode for at least ten minutes to equalize the temperature of the warming unit’s internal components. NOTE: Verify warming unit is set to high fan setting by ensuring the indicator light next to the upper fan is illuminated.
4.
To enter one of the alternative modes, press the Alternative Mode button in combination with one of the operating mode buttons, also located on the front panel. Figure 2 indicates which keys must be pressed to enter each of the 5 alternative modes. When the correct combination of keys is pressed, the display reads “Hold for AltModeX,” where “X” represents the selected alternative mode.
Press the Alternative Mode button (see Figure 2. Location of Alternative Mode button on page 7) and the Ambient button simultaneously for 3 seconds. The warming unit is now in Calibration mode. In this mode, the warming unit performs the following tasks: •
32°C and 38°C indicator lights flash indicating they can be used to adjust the offset value.
•
Blower remains on.
•
Heater elements remain off.
Exiting an Alternative Mode
•
Exit the alternative modes by pressing the Alternative Mode button or by waiting for 60 seconds. You will need to access the alternative modes for several of the service procedures described in this manual.
The text TMP and the end of hose temperature in °C (0.1°C resolution) appear in the alphanumeric display.
•
The text OS and the current calibration offset value (0.1°C resolution) appear in the alphanumeric display.
Hour Meter
AltMode1
Calibration
AltMode2
Fault Code Log
AltMode3
System Information
AltMode4
Over-temperature Detection Test
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Attach the Model 22110 temperature test unit to the end of the warming unit hose.
Figure 2. Location of Alternative Mode button
AltMode0
The Fault Code Log mode sequentially displays the last 5 fault codes stored in system memory. Please refer to the “Fault Code Table” on page 8 for more information about a particular fault code.
1.
STANDBY
Note: Auto tester must not interrupt the voltage during warming unit on power reset or an Error 053/054 may result.
The Calibration mode allows a technician to check and adjust the hose end sensor calibration offset value. This should be done as part of routine maintenance and after servicing the warming unit or replacing the hose. The hose end sensor temperature can be altered a maximum of ±3.0°C by adjusting the calibration offset value. In the Calibration mode, the warming unit operates in the Ambient temperature mode, and the alphanumeric display shows the current hose end sensor temperature and calibration offset with 0.1°C precision.
Note: If the warming unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the calibration procedure.
Calibration AltMode1
Required Preventative Maintenance
The Hour Meter mode displays the cumulative amount of operating time (in Ambient, 32°C, 38°C, and 43°C modes) the warming unit has been in use. The time is displayed in whole hours only.
METHOD
FAULT
AMBIENT
DESCRIPTION
ALTERNATIVE MODES
NOTES:
Accessing the Alternative Modes
•
NOTE: The low fan setting indicator light will not illuminate during power up.
The System Information mode allows the technician to view important system information including the firmware, system identification, serial port baud rate, 5V power supply status, and the control board serial number.
5.
Compare the temperature shown on the alphanumeric display and the temperature shown on the thermocouple monitor. •
If the temperatures match, no adjustment is necessary, press the Alternative Mode button to return the warming unit to Standby mode.
•
If the temperatures do not match, adjust the warming unit displayed temperature:
Calibrating the Operating Temperature
Perform all temperature testing of the warming unit with a ! Caution: 3M Model 22110 temperature test unit. 3M assumes no responsibility for the reliability, safety, or performance of the Bair Hugger temperature management system if temperature tests or adjustments are made in any manner other than those described here. Improper measurement or adjustment of the warming unit’s normal operating temperature could result in patient exposure to temperatures outside of the indicated range and may lead to patient injury.
a.
Press the 32°C button to decrease the temperature or the 38°C button to increase the temperature by 0.1°C. You can adjust the temperature of the warming unit a maximum of ±3°C.
b.
Continue to press the 32°C or 38°C button(s) until the temperature in the alphanumeric display matches the temperature on the thermocouple monitor as close as possible.
c.
Press the Alternative Mode button to store the calibration offset value and return the warming unit to Standby mode.
Service frequency Every 6 months or 500 hours of use, or whenever service is performed.
Tools/equipment Model 22110 temperature test unit
Calibrated thermocouple temperature monitor
GB / 34-8718-8817-7
Note: If it is necessary to enter an offset value greater than ±3°C, there may be a defect in the warming unit hose end sensor. Remove warming unit from service until a new hose assembly can be substituted.
7
Warming Unit Power‑On‑Reset
Fault Conditions
The warming unit automatically performs the following power-on-reset sequence after you connect the warming unit to a properly grounded power source (See Figure 1):
The warming unit software recognizes several nonhazardous fault conditions including:
•
Performs all self-test functions.
•
Illuminates indicator lights and all pixels in the alphanumeric display momentarily.
•
Sensor failures
•
Heater failures
•
Computer failure Software failure
To access the alternative modes, you must press the Alternative Mode button that is located on the front panel of the warming unit but is unlabeled. Press the center of the Bair Hugger logo when the instructions direct you to press the Alternative Mode button.
•
Displays the text “MD 700’s” and the software revision level in the alphanumeric display.
•
Keypad failure
•
Sounds the alarm (three low-level clicks).
•
Power supply failure
•
Enters the Standby mode with the high fan setting selected by default.
•
Blower motor failure
•
Forced over-temperature test failure
If the warming unit loses power for less than 1 second, the warming unit software will return the warming unit to the operating mode you selected prior to the power loss. However, if the warming unit loses power for longer than 1 second, the warming unit software will reset when you restore power. The warming unit will then enter the Standby mode with the high fan setting selected by default.
Temperature Modes The warming unit has 4 operating modes: Ambient, 32°C, 38°C, 43°C.
•
Audible alarm sounds.
•
Blower and heater turn off.
•
Fault code appears in the alphanumeric display.
•
Up to 5 fault codes are stored in memory.
TEMPERATURE MODE
Over‑Temperature Condition
32°C ± 1.5°C
38°C
38°C ± 1.5°C
43°C Ambient
When an over temperature condition exists, the following events occur: •
Over‑temp indicator light flashes.
43°C ± 1.5°C
•
Audible alarm sounds.
Warming unit will supply air at room temperature
•
Blower, heater, and operating mode indicator lights automatically turn off.
•
Fault code appears in the alphanumeric display (see page 9).
After you select a temperature mode, the following events occur: •
Corresponding temperature indicator light illuminates.
When the audible alarm sounds, press any button on the keypad to silence it. The warming unit must be unplugged before it can be restarted.
•
Blower operates at selected fan speed.
Alternative Modes
•
Heater activates except in Ambient mode.
•
Temperature mode timer and hour meter activate.
The warming unit has 5 alternative modes that allow access to the service and calibration utilities of the warming unit (see Figure 2 on page 7).
•
Temperature at the blanket-end of the hose appears in the alphanumeric display.
•
Temp in Range indicator light illuminates when the temperature at the blanket end of the hose is within ±1.5°C of the selected setting; this indicator light does not illuminate in the Ambient mode.
Airflow Modes The warming unit has two preset fan speed settings: a default or high fan setting ( ) and a reduced or low fan setting ( ). The warming unit will reset/default to the high fan setting each time the warming unit is powered up or Standby is selected. The low fan setting ( ) may be preselected while in Standby prior to selecting the desired temperature.
Standby Mode To place the warming unit in Standby mode, press the Standby button. When in Standby mode, the following events occur: •
Standby indicator light illuminates.
•
Blower and heater are turned OFF.
•
Alphanumeric display deactivates.
•
Alarm and fault detection functions remain active.
•
Operating timer pauses.
•
Airflow mode resets/defaults to the high fan setting.
6
PDF Scaled at 75.0%
HIGH
775
43 C
AIR FLOW
System Information AltMode3
MEDIUM
38 C
LOW
When the audible alarm sounds, press any button on the keypad to silence it. The warming unit must be unplugged before it can be restarted. See “Viewing the Fault Code Log” on page 8 and the “Fault Code Table” on page 9 for more information about specific fault codes.
32°C
MODEL
Fault indicator light flashes.
To select the 32°C, 38°C, 43°C, or Ambient mode, press the corresponding button. The warming unit will operate within the specified temperature range, shown in the table below. TEMPERATURE OF DELIVERED AIR
Over‑temperature Detection Test AltMode4
TEMPERATURE
When a fault condition exists, the following events occur: •
The Over‑temperature Detection Test mode allows the user to test the operation of the independent over-temperature shutdown system.
32 C
Fault Code Log AltMode2
TEMP IN RANGE
System
•
The Model 22110 temperature test unit simulates the operating characteristics of 3M warming blankets and gowns when used with Bair Hugger warming units.
•
When using the Model 22110 temperature test unit, take temperature readings using a calibrated thermometer that can accept a male, subminiature connector and read a “K” style thermocouple (e.g., a Fluke Model 52 K/J Thermometer). If the test unit connector does not fit your thermometer, remove the connector from the test unit and attach a connector that fits your meter. Be certain to observe polarity.
OVER TEMP
Alternative Mode button AltMode0
2.
Connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode.
3.
Press the Ambient button to place the warming unit in Ambient mode. Allow the warming unit to run in Ambient mode for at least ten minutes to equalize the temperature of the warming unit’s internal components. NOTE: Verify warming unit is set to high fan setting by ensuring the indicator light next to the upper fan is illuminated.
4.
To enter one of the alternative modes, press the Alternative Mode button in combination with one of the operating mode buttons, also located on the front panel. Figure 2 indicates which keys must be pressed to enter each of the 5 alternative modes. When the correct combination of keys is pressed, the display reads “Hold for AltModeX,” where “X” represents the selected alternative mode.
Press the Alternative Mode button (see Figure 2. Location of Alternative Mode button on page 7) and the Ambient button simultaneously for 3 seconds. The warming unit is now in Calibration mode. In this mode, the warming unit performs the following tasks: •
32°C and 38°C indicator lights flash indicating they can be used to adjust the offset value.
•
Blower remains on.
•
Heater elements remain off.
Exiting an Alternative Mode
•
Exit the alternative modes by pressing the Alternative Mode button or by waiting for 60 seconds. You will need to access the alternative modes for several of the service procedures described in this manual.
The text TMP and the end of hose temperature in °C (0.1°C resolution) appear in the alphanumeric display.
•
The text OS and the current calibration offset value (0.1°C resolution) appear in the alphanumeric display.
Hour Meter
AltMode1
Calibration
AltMode2
Fault Code Log
AltMode3
System Information
AltMode4
Over-temperature Detection Test
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Attach the Model 22110 temperature test unit to the end of the warming unit hose.
Figure 2. Location of Alternative Mode button
AltMode0
The Fault Code Log mode sequentially displays the last 5 fault codes stored in system memory. Please refer to the “Fault Code Table” on page 8 for more information about a particular fault code.
1.
STANDBY
Note: Auto tester must not interrupt the voltage during warming unit on power reset or an Error 053/054 may result.
The Calibration mode allows a technician to check and adjust the hose end sensor calibration offset value. This should be done as part of routine maintenance and after servicing the warming unit or replacing the hose. The hose end sensor temperature can be altered a maximum of ±3.0°C by adjusting the calibration offset value. In the Calibration mode, the warming unit operates in the Ambient temperature mode, and the alphanumeric display shows the current hose end sensor temperature and calibration offset with 0.1°C precision.
Note: If the warming unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the calibration procedure.
Calibration AltMode1
Required Preventative Maintenance
The Hour Meter mode displays the cumulative amount of operating time (in Ambient, 32°C, 38°C, and 43°C modes) the warming unit has been in use. The time is displayed in whole hours only.
METHOD
FAULT
AMBIENT
DESCRIPTION
ALTERNATIVE MODES
NOTES:
Accessing the Alternative Modes
•
NOTE: The low fan setting indicator light will not illuminate during power up.
The System Information mode allows the technician to view important system information including the firmware, system identification, serial port baud rate, 5V power supply status, and the control board serial number.
5.
Compare the temperature shown on the alphanumeric display and the temperature shown on the thermocouple monitor. •
If the temperatures match, no adjustment is necessary, press the Alternative Mode button to return the warming unit to Standby mode.
•
If the temperatures do not match, adjust the warming unit displayed temperature:
Calibrating the Operating Temperature
Perform all temperature testing of the warming unit with a ! Caution: 3M Model 22110 temperature test unit. 3M assumes no responsibility for the reliability, safety, or performance of the Bair Hugger temperature management system if temperature tests or adjustments are made in any manner other than those described here. Improper measurement or adjustment of the warming unit’s normal operating temperature could result in patient exposure to temperatures outside of the indicated range and may lead to patient injury.
a.
Press the 32°C button to decrease the temperature or the 38°C button to increase the temperature by 0.1°C. You can adjust the temperature of the warming unit a maximum of ±3°C.
b.
Continue to press the 32°C or 38°C button(s) until the temperature in the alphanumeric display matches the temperature on the thermocouple monitor as close as possible.
c.
Press the Alternative Mode button to store the calibration offset value and return the warming unit to Standby mode.
Service frequency Every 6 months or 500 hours of use, or whenever service is performed.
Tools/equipment Model 22110 temperature test unit
Calibrated thermocouple temperature monitor
GB / 34-8718-8817-7
Note: If it is necessary to enter an offset value greater than ±3°C, there may be a defect in the warming unit hose end sensor. Remove warming unit from service until a new hose assembly can be substituted.
7
Testing the Over‑Temperature Detection System
!
b.
Warning: Do not perform the over-temperature detection system test while the warming unit is being used for warming therapy.
Perform all temperature testing of the warming unit with a ! Caution: 3M Model 22110 temperature test unit. Connect each warming unit being tested to a separate ! Caution: power source.
FAIL–Warming unit did not detect an over-temperature condition within 150 seconds (time-out failure). An alarm sounds and the Fault indicator light flashes. The text FAIL flashes in the alphanumeric display, followed by these messages: i.
OT Test ‑ FAIL
ii.
TestTime ‑ 150 Secs
iii.
Unplug ‑ To Reset
Fault Code Table
2.
The software will detect and report the following conditions by displaying the corresponding fault code: FAULT CONDITION
FAULT CODE
Internal sensor 1 over-temperature condition
001
Hose end sensor 2 over-temperature condition
002
Hose end sensor 3 over-temperature condition
003
Every 6 months or 500 hours of use, or whenever service is performed.
Note: Do not place a warming unit back into service if it fails the over-temperature test. Contact 3M technical support.
Internal sensor 1 shorted
004
TOOLS/EQUIPMENT
Hose end sensor 2 shorted
005
7.
Hose end sensor 3 shorted
006
Hose end sensor 2 open
007
Rapid button press, blower failure, open thermostat or low wattage heater failure
008
Open thermostat/medium wattage heater failure
009
High wattage heater failure
010
SERVICE FREQUENCY
Model 22110 temperature test unit Calibrated thermocouple temperature monitor
Method Note: If continuing from the previous section (Calibrating the Operating Temperature) skip to step 4. Note: If the warming unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the test. 1.
Connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode.
2.
Connect the temperature test kit to the hose of the warming unit.
3.
Press the Ambient button and allow the warming unit to run for 5 minutes.
NOTE: Verify warming unit is set to the high fan ( the indicator light by the upper fan is illuminated. 4.
5.
6.
8.
After the test is complete, allow the warming unit to cool by running it for at least five minutes.
9.
Unplug the warming unit to reset it to normal operation.
Viewing the Fault Code Log SERVICE FREQUENCY As often as necessary.
TOOLS/EQUIPMENT None required. 1.
•
Blower remains ON.
•
Heater elements turn ON at full power.
•
43°C indicator light flashes.
•
Over-temperature timer activates.
•
OT Test flashes in the alphanumeric display.
2.
Heater elements turn OFF.
•
Blower continues to operate. (NOTE: The blower turns off if an over-temperature condition occurs during normal use.)
View the alphanumeric display to determine test outcome: a.
PASS–The warming unit detected an over-temperature condition within 150 seconds. An alarm sounds for 2 short beeps. The text “PASS” flashes in the alphanumeric display, followed by these messages: i.
OT Test ‑ PASS‑Prx or OT Test ‑ PASS‑Dst
ii.
TestTime ‑ XX Secs
iii.
Unplug ‑ To Reset
8
PDF Scaled at 75.0%
4.
012
(Reserved Fault Code)
013
Error in execution loop
014 015 016
If your warming unit is already ON, you can access the fault code log from any operating mode. Otherwise, connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode. Then select any operating mode.
Error in executing a depressed key
017
Stuck key during startup
050
EEPROM is at max # write cycles
051
Non-0 EEPROM byte detected after zeroing
052
Press the Alternative Mode button (Figure 2. Location of Alternative Mode button on page 7) and the 32°C button simultaneously for three seconds. The warming unit is now in Fault Code Log mode. In this mode, the warming unit performs the following tasks:
EEPROM checksum failure on copy #1 (see page 11)
053
EEPROM compare failure copy #1 to copy #2
a.
Continues to operate in current operating mode.
b.
32°C and 38°C indicator light flashes.
c.
Text FC(n) XXX appears in the alphanumeric display. FC is an abbreviation for the phrase fault code n represents the numerical order of the fault code in the log, and XXX represents the code for the fault condition. See page 9 for a list of fault codes and their meanings.
d.
3.
011
A/D startup check failed
RAM corruption in duplicate RAM locations
Wait for the warming unit to perform the over-temperature test. When the test is complete, the warming unit performs the following tasks: •
A/D converter timeout
Timeout on alphanumeric display busy flag clearing
METHOD
) setting by ensuring
With the warming unit in Ambient mode, press the Alternative Mode button (See Figure 2. Location of Alternative Mode button on page 7) and the 43°C button simultaneously for 3 seconds. The warming unit is now in the Over‑Temperature Detection Test mode. In this mode, the warming unit performs the following tasks:
Record the maximum temperature displayed by the test kit. (Use Maintenance Log on page 17.) If the temperature is outside the range of 46°C to 56°C, contact 3M technical support for further instructions.
The time (HH:MM:SS) of each fault appears below FC(n) XXX in the alphanumeric display. If the warming unit reaches 100 or more hours the time only reads hours and minutes.
Press either the 32°C or 38°C button to view the next fault code in the log. The warming unit stores a maximum of 5 fault codes in non volatile memory. Press the Alternative Mode button to return the warming unit to its previous operating mode.
Clearing the Fault Code Log
a.
Continues to operate in current operating mode.
b.
Hours appears in the alphanumeric display.
c.
Cumulative hours of warming unit operation appear in the alphanumeric display. The time is displayed in whole hours only.
Wait 60 seconds or press the Alternative Mode button to return the warming unit to its previous operating mode.
Viewing the Operating Timer To view the amount of time the warming unit has been operating in the current temperature mode, press and hold the current temperature mode button for at least 3 seconds. The time is displayed in HH:MM:SS format.
Replacing the Air Filter SERVICE FREQUENCY Every 12 months or 500 hours of use.
TOOLS/EQUIPMENT Replacement air filter #2 Phillips screwdriver Do not attempt to clean the air filter as it may be ! Caution: contaminated from use. Discard the filter in a manner consistent with institutional protocol.
Method 1.
Disconnect the warming unit from the grounded power source.
2.
Turn the warming unit upside down.
3.
Remove the 2 screws located in the louvered filter cover.
4.
Lift the filter cover off the warming unit.
054
5.
Remove the air filter and discard it.
EEPROM compare failure copy #1 to RAM
055
6.
EEPROM write cycle time out
056
Place the new filter in the filter compartment with the gasket toward the filter ledge.
SPI byte transfer time out
057
7.
Replace the filter cover with the louvers facing the back of the warming unit.
8.
Replace the 2 screws in the filter cover.
EEPROM write error when entering standby
059
Real time clock failure
060
Temperature out of range high
070
Replacing the Hose SERVICE FREQUENCY
Temperature out of range low
071
5 V power supply in excess of 5.333 V
100
5 V power supply under 4.667 V
101
Startup test EEPROM error
102
Needle-nose pliers
Startup test RAM error
103
Strap wrench
Viewing the Hour Meter SERVICE FREQUENCY As often as necessary.
Put the warming unit in Fault Code mode by pressing the Alternative Mode button and the 32°C button simultaneously for three seconds; then, press the 43°C button.
TOOLS/EQUIPMENT
NOTE: The fault code log should not be cleared unless instructed to do so by a 3M representative.
1.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
3.
Press the Alternative Mode button for 3 seconds. (See Figure 2. Location of Alternative Mode button on page 7.) The warming unit is now in Hour Meter Display mode. In this mode, the warming unit performs the following tasks:
As needed.
TOOLS/EQUIPMENT Replacement hose
METHOD Detaching Warming Unit Hose 1.
Disconnect the warming unit from the power source before replacing hose.
None required.
2.
Unscrew the hose collar.
METHOD
3.
Slide the hose out of the warming unit. The hose will still be attached to the warming unit by a cable.
4.
By hand or using a needle-nose pliers, carefully detach the cable connector from the header plug located inside the hose connector (see Figure 3. Hose replacement).
If your warming unit is already ON, you can begin the test from any operating mode. Otherwise, connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode. Then select any operating mode.
GB / 34-8718-8817-7
9
Testing the Over‑Temperature Detection System
!
b.
Warning: Do not perform the over-temperature detection system test while the warming unit is being used for warming therapy.
Perform all temperature testing of the warming unit with a ! Caution: 3M Model 22110 temperature test unit. Connect each warming unit being tested to a separate ! Caution: power source.
FAIL–Warming unit did not detect an over-temperature condition within 150 seconds (time-out failure). An alarm sounds and the Fault indicator light flashes. The text FAIL flashes in the alphanumeric display, followed by these messages: i.
OT Test ‑ FAIL
ii.
TestTime ‑ 150 Secs
iii.
Unplug ‑ To Reset
Fault Code Table
2.
The software will detect and report the following conditions by displaying the corresponding fault code: FAULT CONDITION
FAULT CODE
Internal sensor 1 over-temperature condition
001
Hose end sensor 2 over-temperature condition
002
Hose end sensor 3 over-temperature condition
003
Every 6 months or 500 hours of use, or whenever service is performed.
Note: Do not place a warming unit back into service if it fails the over-temperature test. Contact 3M technical support.
Internal sensor 1 shorted
004
TOOLS/EQUIPMENT
Hose end sensor 2 shorted
005
7.
Hose end sensor 3 shorted
006
Hose end sensor 2 open
007
Rapid button press, blower failure, open thermostat or low wattage heater failure
008
Open thermostat/medium wattage heater failure
009
High wattage heater failure
010
SERVICE FREQUENCY
Model 22110 temperature test unit Calibrated thermocouple temperature monitor
Method Note: If continuing from the previous section (Calibrating the Operating Temperature) skip to step 4. Note: If the warming unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the test. 1.
Connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode.
2.
Connect the temperature test kit to the hose of the warming unit.
3.
Press the Ambient button and allow the warming unit to run for 5 minutes.
NOTE: Verify warming unit is set to the high fan ( the indicator light by the upper fan is illuminated. 4.
5.
6.
8.
After the test is complete, allow the warming unit to cool by running it for at least five minutes.
9.
Unplug the warming unit to reset it to normal operation.
Viewing the Fault Code Log SERVICE FREQUENCY As often as necessary.
TOOLS/EQUIPMENT None required. 1.
•
Blower remains ON.
•
Heater elements turn ON at full power.
•
43°C indicator light flashes.
•
Over-temperature timer activates.
•
OT Test flashes in the alphanumeric display.
2.
Heater elements turn OFF.
•
Blower continues to operate. (NOTE: The blower turns off if an over-temperature condition occurs during normal use.)
View the alphanumeric display to determine test outcome: a.
PASS–The warming unit detected an over-temperature condition within 150 seconds. An alarm sounds for 2 short beeps. The text “PASS” flashes in the alphanumeric display, followed by these messages: i.
OT Test ‑ PASS‑Prx or OT Test ‑ PASS‑Dst
ii.
TestTime ‑ XX Secs
iii.
Unplug ‑ To Reset
8
PDF Scaled at 75.0%
4.
012
(Reserved Fault Code)
013
Error in execution loop
014 015 016
If your warming unit is already ON, you can access the fault code log from any operating mode. Otherwise, connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode. Then select any operating mode.
Error in executing a depressed key
017
Stuck key during startup
050
EEPROM is at max # write cycles
051
Non-0 EEPROM byte detected after zeroing
052
Press the Alternative Mode button (Figure 2. Location of Alternative Mode button on page 7) and the 32°C button simultaneously for three seconds. The warming unit is now in Fault Code Log mode. In this mode, the warming unit performs the following tasks:
EEPROM checksum failure on copy #1 (see page 11)
053
EEPROM compare failure copy #1 to copy #2
a.
Continues to operate in current operating mode.
b.
32°C and 38°C indicator light flashes.
c.
Text FC(n) XXX appears in the alphanumeric display. FC is an abbreviation for the phrase fault code n represents the numerical order of the fault code in the log, and XXX represents the code for the fault condition. See page 9 for a list of fault codes and their meanings.
d.
3.
011
A/D startup check failed
RAM corruption in duplicate RAM locations
Wait for the warming unit to perform the over-temperature test. When the test is complete, the warming unit performs the following tasks: •
A/D converter timeout
Timeout on alphanumeric display busy flag clearing
METHOD
) setting by ensuring
With the warming unit in Ambient mode, press the Alternative Mode button (See Figure 2. Location of Alternative Mode button on page 7) and the 43°C button simultaneously for 3 seconds. The warming unit is now in the Over‑Temperature Detection Test mode. In this mode, the warming unit performs the following tasks:
Record the maximum temperature displayed by the test kit. (Use Maintenance Log on page 17.) If the temperature is outside the range of 46°C to 56°C, contact 3M technical support for further instructions.
The time (HH:MM:SS) of each fault appears below FC(n) XXX in the alphanumeric display. If the warming unit reaches 100 or more hours the time only reads hours and minutes.
Press either the 32°C or 38°C button to view the next fault code in the log. The warming unit stores a maximum of 5 fault codes in non volatile memory. Press the Alternative Mode button to return the warming unit to its previous operating mode.
Clearing the Fault Code Log
a.
Continues to operate in current operating mode.
b.
Hours appears in the alphanumeric display.
c.
Cumulative hours of warming unit operation appear in the alphanumeric display. The time is displayed in whole hours only.
Wait 60 seconds or press the Alternative Mode button to return the warming unit to its previous operating mode.
Viewing the Operating Timer To view the amount of time the warming unit has been operating in the current temperature mode, press and hold the current temperature mode button for at least 3 seconds. The time is displayed in HH:MM:SS format.
Replacing the Air Filter SERVICE FREQUENCY Every 12 months or 500 hours of use.
TOOLS/EQUIPMENT Replacement air filter #2 Phillips screwdriver Do not attempt to clean the air filter as it may be ! Caution: contaminated from use. Discard the filter in a manner consistent with institutional protocol.
Method 1.
Disconnect the warming unit from the grounded power source.
2.
Turn the warming unit upside down.
3.
Remove the 2 screws located in the louvered filter cover.
4.
Lift the filter cover off the warming unit.
054
5.
Remove the air filter and discard it.
EEPROM compare failure copy #1 to RAM
055
6.
EEPROM write cycle time out
056
Place the new filter in the filter compartment with the gasket toward the filter ledge.
SPI byte transfer time out
057
7.
Replace the filter cover with the louvers facing the back of the warming unit.
8.
Replace the 2 screws in the filter cover.
EEPROM write error when entering standby
059
Real time clock failure
060
Temperature out of range high
070
Replacing the Hose SERVICE FREQUENCY
Temperature out of range low
071
5 V power supply in excess of 5.333 V
100
5 V power supply under 4.667 V
101
Startup test EEPROM error
102
Needle-nose pliers
Startup test RAM error
103
Strap wrench
Viewing the Hour Meter SERVICE FREQUENCY As often as necessary.
Put the warming unit in Fault Code mode by pressing the Alternative Mode button and the 32°C button simultaneously for three seconds; then, press the 43°C button.
TOOLS/EQUIPMENT
NOTE: The fault code log should not be cleared unless instructed to do so by a 3M representative.
1.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
3.
Press the Alternative Mode button for 3 seconds. (See Figure 2. Location of Alternative Mode button on page 7.) The warming unit is now in Hour Meter Display mode. In this mode, the warming unit performs the following tasks:
As needed.
TOOLS/EQUIPMENT Replacement hose
METHOD Detaching Warming Unit Hose 1.
Disconnect the warming unit from the power source before replacing hose.
None required.
2.
Unscrew the hose collar.
METHOD
3.
Slide the hose out of the warming unit. The hose will still be attached to the warming unit by a cable.
4.
By hand or using a needle-nose pliers, carefully detach the cable connector from the header plug located inside the hose connector (see Figure 3. Hose replacement).
If your warming unit is already ON, you can begin the test from any operating mode. Otherwise, connect the warming unit to a grounded power source. The warming unit performs a self-test and automatically proceeds to Standby mode. Then select any operating mode.
GB / 34-8718-8817-7
9
METHOD 1.
Detach the warming unit hose (see Detaching Warming Unit Hose on page 9 for instructions).
Disassembling the Warming Unit
1.
Disconnect the warming unit from the power source before cleaning.
STORAGE
2.
Cleaning should be performed in accordance with hospital practices for cleaning OR equipment. After every use; wipe the warming unit, the outside of the warming unit hose, and any other surfaces that may have been touched. Use a damp, soft cloth and a hospital approved mild detergent, germicidal disposable wipes, disinfecting towelettes, or antimicrobial spray.
Turn warming unit upside down.
2.
Using a Phillips screwdriver, remove the eight screws that secure the top and bottom enclosures together
3.
Turn warming unit upright.
4.
Remove four screws that attach upper enclosure to back plate.
3.
5.
Lift the upper enclosure straight up and disconnect the user interface wire by squeezing the release tabs.
Notice:
6.
Replace fuses.
Let air dry or dry with a separate clean soft cloth.
Do not use cleaning solutions with greater than 80% alcohol or solvents, including acetone and thinner, to clean the warming unit or hose. Solvents may damage the labels and other plastic parts.
Attach the cable connector of the new warming unit hose to the header plug, making sure that the protrusions on the connector align with the corresponding slots on the header.
FAULT CODE
4.
Reconnect the warming unit to a grounded power source.
5.
Calibrate operating temperature settings. See page 7.
6.
Perform over-temperature detection system test. See page 8.
Replacing the Fuses SERVICE FREQUENCY
Reassembling the Warming Unit
As needed.
1.
Slide the upper enclosure over the chassis.
2.
Reinstall the four enclosure screws to attach the upper enclosure to the back plate. Push down on the top of the warming unit when tightening the screws to attain proper sealing of the enclosures.
3.
Flip the warming unit upside down and replace the eight enclosure screws. In order to obtain a proper seal and prevent noise, be sure to tighten these screws fully. If using a power screwdriver, you may need to increase the torque setting to ensure proper seating. Once complete, if there is a whistling noise present it is most likely from these screws not being fully tightened.
Do not disassemble the warming unit unless you are a ! Warning: qualified service technician. There are electrically live parts with-in the warming unit when it is connected to a power source.
Notice: Use proper Electrostatic Discharge (ESD) procedures when performing maintenance. Failure to do so may result in damage to the warming unit.
TOOLS/EQUIPMENT Phillips screwdriver Wire cutter Wire tie
4.
Reattach the warming unit hose (see Reattaching Warming Unit Hose on page 10 for instructions).
Needle-nose pliers
FC-002 AT TURN ON OR AFTER PRESSING A TEMPERATURE SETTING
Firmly screw the hose collar back into place.
Fuses
PERMANENT ERRORS – A FAULT CONDITION ALWAYS OCCURS
FC-001
Align the flat section of the warming unit hose end with the corresponding flat part of the warming unit’s hose connector and slide the replacement hose into the warming unit.
3.
FC-003 FC-005 FC-006 FC-007 FC-008 FC-009
PDF Scaled at 75.0%
GB / 34-8718-8817-7
Troubleshooting The warming unit software routinely checks unusual operating conditions. If such a condition occurs, the system may trigger a fault condition and alarm. The warming unit can be reset by disconnecting the warming unit from the main power source and allowing 30-60 seconds for the system to reset. If the fault code condition reoccurs, disconnect again and wait 5 minutes for the system to reset. If the fault condition reoccurs upon connection to the main power source, the warming unit may have a hard-fault or permanent error. Contact 3M technical support. If the fault does not reoccur upon connection to the main power source, the warming unit may have a cautionary fault.
POSSIBLE CAUSE
SOLUTION Replace warming unit hose. Refer to service manual or IFU included with replacement part for instructions.
Faulty elbow sensor.
Replace elbow sensor. Refer to IFU included with replacement part for instructions.
Warming Unit Hose disconnected from warming unit (FC-007 only).
Reattach warming unit hose.
Faulty heater element or faulty control board.
Verify fan runs in ambient.
FC-010
Calibrate and return to service.
Check resistance of J4 connector on control board. The resistance may be up to 400 Ohms. White to black White to blue White to yellow If “open”, replace heater. Otherwise, replace control board. Calibrate and return to service.
FC-050
Defective user interface.
Replace user interface. Calibrate and return to service.
FC-053, 054
EEPROM error.
Reset microprocessor. (Press and hold Alternative Mode button and Standby buttons at same time then connect to power source. Release buttons when Standby light remains on). Calibrate and return to service.
FC-101
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Store all components in a cool, dry place when not in use.
Faulty hose end sensor at patient end.
FC-004
FC-100
10
As needed.
Do not immerse the Bair Hugger warming unit, warming unit parts, or accessories in any liquid or subject them to any sterilization process.
Reattaching Warming Unit Hose
2.
SERVICE FREQUENCY
1.
Figure 3. Warming Unit Hose Replacement
1.
Cleaning, Maintenance and Storage Cleaning Instructions
Defective control board.
Replace control board. Calibrate and return to service.
11
METHOD 1.
Detach the warming unit hose (see Detaching Warming Unit Hose on page 9 for instructions).
Disassembling the Warming Unit
1.
Disconnect the warming unit from the power source before cleaning.
STORAGE
2.
Cleaning should be performed in accordance with hospital practices for cleaning OR equipment. After every use; wipe the warming unit, the outside of the warming unit hose, and any other surfaces that may have been touched. Use a damp, soft cloth and a hospital approved mild detergent, germicidal disposable wipes, disinfecting towelettes, or antimicrobial spray.
Turn warming unit upside down.
2.
Using a Phillips screwdriver, remove the eight screws that secure the top and bottom enclosures together
3.
Turn warming unit upright.
4.
Remove four screws that attach upper enclosure to back plate.
3.
5.
Lift the upper enclosure straight up and disconnect the user interface wire by squeezing the release tabs.
Notice:
6.
Replace fuses.
Let air dry or dry with a separate clean soft cloth.
Do not use cleaning solutions with greater than 80% alcohol or solvents, including acetone and thinner, to clean the warming unit or hose. Solvents may damage the labels and other plastic parts.
Attach the cable connector of the new warming unit hose to the header plug, making sure that the protrusions on the connector align with the corresponding slots on the header.
FAULT CODE
4.
Reconnect the warming unit to a grounded power source.
5.
Calibrate operating temperature settings. See page 7.
6.
Perform over-temperature detection system test. See page 8.
Replacing the Fuses SERVICE FREQUENCY
Reassembling the Warming Unit
As needed.
1.
Slide the upper enclosure over the chassis.
2.
Reinstall the four enclosure screws to attach the upper enclosure to the back plate. Push down on the top of the warming unit when tightening the screws to attain proper sealing of the enclosures.
3.
Flip the warming unit upside down and replace the eight enclosure screws. In order to obtain a proper seal and prevent noise, be sure to tighten these screws fully. If using a power screwdriver, you may need to increase the torque setting to ensure proper seating. Once complete, if there is a whistling noise present it is most likely from these screws not being fully tightened.
Do not disassemble the warming unit unless you are a ! Warning: qualified service technician. There are electrically live parts with-in the warming unit when it is connected to a power source.
Notice: Use proper Electrostatic Discharge (ESD) procedures when performing maintenance. Failure to do so may result in damage to the warming unit.
TOOLS/EQUIPMENT Phillips screwdriver Wire cutter Wire tie
4.
Reattach the warming unit hose (see Reattaching Warming Unit Hose on page 10 for instructions).
Needle-nose pliers
FC-002 AT TURN ON OR AFTER PRESSING A TEMPERATURE SETTING
Firmly screw the hose collar back into place.
Fuses
PERMANENT ERRORS – A FAULT CONDITION ALWAYS OCCURS
FC-001
Align the flat section of the warming unit hose end with the corresponding flat part of the warming unit’s hose connector and slide the replacement hose into the warming unit.
3.
FC-003 FC-005 FC-006 FC-007 FC-008 FC-009
PDF Scaled at 75.0%
GB / 34-8718-8817-7
Troubleshooting The warming unit software routinely checks unusual operating conditions. If such a condition occurs, the system may trigger a fault condition and alarm. The warming unit can be reset by disconnecting the warming unit from the main power source and allowing 30-60 seconds for the system to reset. If the fault code condition reoccurs, disconnect again and wait 5 minutes for the system to reset. If the fault condition reoccurs upon connection to the main power source, the warming unit may have a hard-fault or permanent error. Contact 3M technical support. If the fault does not reoccur upon connection to the main power source, the warming unit may have a cautionary fault.
POSSIBLE CAUSE
SOLUTION Replace warming unit hose. Refer to service manual or IFU included with replacement part for instructions.
Faulty elbow sensor.
Replace elbow sensor. Refer to IFU included with replacement part for instructions.
Warming Unit Hose disconnected from warming unit (FC-007 only).
Reattach warming unit hose.
Faulty heater element or faulty control board.
Verify fan runs in ambient.
FC-010
Calibrate and return to service.
Check resistance of J4 connector on control board. The resistance may be up to 400 Ohms. White to black White to blue White to yellow If “open”, replace heater. Otherwise, replace control board. Calibrate and return to service.
FC-050
Defective user interface.
Replace user interface. Calibrate and return to service.
FC-053, 054
EEPROM error.
Reset microprocessor. (Press and hold Alternative Mode button and Standby buttons at same time then connect to power source. Release buttons when Standby light remains on). Calibrate and return to service.
FC-101
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Store all components in a cool, dry place when not in use.
Faulty hose end sensor at patient end.
FC-004
FC-100
10
As needed.
Do not immerse the Bair Hugger warming unit, warming unit parts, or accessories in any liquid or subject them to any sterilization process.
Reattaching Warming Unit Hose
2.
SERVICE FREQUENCY
1.
Figure 3. Warming Unit Hose Replacement
1.
Cleaning, Maintenance and Storage Cleaning Instructions
Defective control board.
Replace control board. Calibrate and return to service.
11
FAULT CODE FC-001
POSSIBLE CAUSE Airflow occluded.
FC-003 FC-008 Intermittent elbow sensor failure.
SOLUTION Disconnect from power source. Remove warming unit hose occlusion. Position hose end correctly into hose card (refer to the Operator’s Manual). Check for air intake obstructions on the bottom of the warming unit. Replace filter. Wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit is ready for use.
The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming unit should assure that it is used in such an environment.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source.
RF emissions
FC-003 FC-004 FC-005 FC-006
WHILE UNIT IS IN USE
CAUTIONARY ERRORS – FAULT CONDITION
If these faults continue to occur during use and the airflow is not occluded replace elbow sensor. FC-002
FC-007
Warming unit hose end sensor failure at patient end. Moisture. Intermittent hose sensor failure.
Guidance and manufacturer’s declaration – electromagnetic emissions
Emissions test
Compliance
Electromagnetic environment ‑ guidance
Group 1
The Model 775 warming unit uses RF energy only for its internal function. Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment.
Class B
The Model 775 warming unit is suitable for use in all establishments, including domestic establishments and those directly connected to the public low-voltage power supply network that supplies buildings used for domestic purposes.
CISPR 11 RF emissions
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit is ready to use.
Harmonic emissions
If these faults continue to occur during use, replace hose.
IEC 61000-3-2
CISPR 11 Class A
Voltage fluctuations/ Flicker emissions
High heat. Intermittent elbow sensor failure.
Specifications
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source.
Complies
IEC 61000-3-3
If these faults continue to occur during use and the airflow is not occluded replace elbow sensor. FC-070
Warming unit hose end temperature exceeds the set point by at least 5°C for approximately 5 minutes. Faulty control board.
FC-071
Warming unit hose end temperature is at least 10°C below the set point for approximately 10 minutes. Faulty control board. Faulty heater. Faulty blower.
Whistling sound during operation
Air leaks in enclosure or warming unit hose. Faulty bearing in blower motor.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit Is ready to use. Replace control board.
Immunity Test
Calibrate and return to service. Unplug the warming unit, then wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit Is ready to use. Replace control board. Replace heater. Replace blower. Calibrate and return to service. Tighten all screws. Check for holes in warming unit hose. Check for loose warming unit hose collar and presence of O-rings. Clean the filter gasket and mating surface.
Technical Support and Order Placement USA
Returning Warming Units for Service TOOLS/EQUIPMENT
TEL: 800-733-7775
3M service carton
OUTSIDE OF THE USA
Tape dispenser
Contact your local 3M representative.
Shipping label
When You Call for Technical Support
Marking pen
We will need to know the serial number of your Bair Hugger warming unit when you call us. The serial number label is located on the back of the warming unit.
METHOD
In‑Warranty Repair and Exchange USA Call 3M technical support if your warming unit requires factory service. A technical support representative will give you a Return Authorization (RA) number. Please use this RA number on all correspondence concerning your warming unit. Your technical support representative will also send a shipping carton to you at no charge, if needed. Call your local supplier or sales representative to inquire about borrowing a warming unit while we service your warming unit.
1.
Call 3M technical support (see page 12 for contact information) to get a Return Authorization (RA) number and a service carton.
2.
Remove the top foam piece. If the plastic liner is available, use it to enclose the warming unit.
3.
Lower the warming unit carefully into the carton.
4.
Replace the top foam piece. Observe proper orientation. Hose will extend out in the corner of foam.
5.
Lay the warming unit hose on top of the foam piece around the edge.
6.
Seal the carton with tape.
OUTSIDE THE USA
7.
Apply the shipping label addressed to 3M Health Care.
Contact your local distributor concerning in-warranty repair and exchange.
8.
Write the RA number on the outside of the carton.
9.
Ship to 3M Health Care.
12
PDF Scaled at 75.0%
Guidance and manufacturer’s declaration – electromagnetic immunity The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming unit should assure that it is used in such an environment.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Electrostatic discharge (ESD)
IEC 60601 test level
Compliance level
±6 kV contact
±6 kV contact
±8 kV air
±8 kV air
Electrical fast transient/burst
±2 kV for power supply lines
±2 kV for power supply lines
IEC 61000-4-4
±1 kV for input/output lines
±1 kV for input/output lines
Surge
±1 kV line to line
±1 kV line to line
IEC 61000-4-5
±2 kV line(s) to earth
±2 kV line(s) to earth
Voltage dips, short interruptions and voltage variations on power supply input lines
<5% UT (>95% dip in UT) for 0,5 cycle
<5% UT (>95% dip in UT) for 0,5 cycle
40% UT (60% dip in UT) for 5 cycles
40% UT (60% dip in UT) for 5 cycles
70% UT (30% dip in UT) for 25 cycles
70% UT (30% dip in UT) for 25 cycles
<5% UT (>95% dip in UT) for 5 sec
<5% UT (>95% dip in UT) for 5 sec
3 A/m
3 A/m
IEC 61000-4-2
IEC 61000-4-11
Power frequency (50/60 Hz) magnetic field
Electromagnetic environment ‑ guidance Floors should be wood, concrete or ceramic tile. If floors are covered with synthetic material, the relative humidity should be at least 30%. Mains power quality should be that of a typical commercial or hospital environment.
Mains power quality should be that of a typical commercial or hospital environment. Mains power quality should be that of a typical commercial or hospital environment. If the user of the Model 775 warming unit requires continued operation during power mains interruptions, it is recommended that the Model 775 warming unit be powered from an uninterruptible power supply or a battery.
Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment.
IEC 61000-4-8 NOTE UT is the a.c. mains voltage prior to application of the test level.
GB / 34-8718-8817-7
13
FAULT CODE FC-001
POSSIBLE CAUSE Airflow occluded.
FC-003 FC-008 Intermittent elbow sensor failure.
SOLUTION Disconnect from power source. Remove warming unit hose occlusion. Position hose end correctly into hose card (refer to the Operator’s Manual). Check for air intake obstructions on the bottom of the warming unit. Replace filter. Wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit is ready for use.
The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming unit should assure that it is used in such an environment.
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source.
RF emissions
FC-003 FC-004 FC-005 FC-006
WHILE UNIT IS IN USE
CAUTIONARY ERRORS – FAULT CONDITION
If these faults continue to occur during use and the airflow is not occluded replace elbow sensor. FC-002
FC-007
Warming unit hose end sensor failure at patient end. Moisture. Intermittent hose sensor failure.
Guidance and manufacturer’s declaration – electromagnetic emissions
Emissions test
Compliance
Electromagnetic environment ‑ guidance
Group 1
The Model 775 warming unit uses RF energy only for its internal function. Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment.
Class B
The Model 775 warming unit is suitable for use in all establishments, including domestic establishments and those directly connected to the public low-voltage power supply network that supplies buildings used for domestic purposes.
CISPR 11 RF emissions
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit is ready to use.
Harmonic emissions
If these faults continue to occur during use, replace hose.
IEC 61000-3-2
CISPR 11 Class A
Voltage fluctuations/ Flicker emissions
High heat. Intermittent elbow sensor failure.
Specifications
Disconnect from power source. Allow warming unit to cool. Wait 30-60 seconds before reconnecting to the main power source.
Complies
IEC 61000-3-3
If these faults continue to occur during use and the airflow is not occluded replace elbow sensor. FC-070
Warming unit hose end temperature exceeds the set point by at least 5°C for approximately 5 minutes. Faulty control board.
FC-071
Warming unit hose end temperature is at least 10°C below the set point for approximately 10 minutes. Faulty control board. Faulty heater. Faulty blower.
Whistling sound during operation
Air leaks in enclosure or warming unit hose. Faulty bearing in blower motor.
Unplug the warming unit, then wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit Is ready to use. Replace control board.
Immunity Test
Calibrate and return to service. Unplug the warming unit, then wait 30-60 seconds before reconnecting to the main power source. If no fault occurs, warming unit Is ready to use. Replace control board. Replace heater. Replace blower. Calibrate and return to service. Tighten all screws. Check for holes in warming unit hose. Check for loose warming unit hose collar and presence of O-rings. Clean the filter gasket and mating surface.
Technical Support and Order Placement USA
Returning Warming Units for Service TOOLS/EQUIPMENT
TEL: 800-733-7775
3M service carton
OUTSIDE OF THE USA
Tape dispenser
Contact your local 3M representative.
Shipping label
When You Call for Technical Support
Marking pen
We will need to know the serial number of your Bair Hugger warming unit when you call us. The serial number label is located on the back of the warming unit.
METHOD
In‑Warranty Repair and Exchange USA Call 3M technical support if your warming unit requires factory service. A technical support representative will give you a Return Authorization (RA) number. Please use this RA number on all correspondence concerning your warming unit. Your technical support representative will also send a shipping carton to you at no charge, if needed. Call your local supplier or sales representative to inquire about borrowing a warming unit while we service your warming unit.
1.
Call 3M technical support (see page 12 for contact information) to get a Return Authorization (RA) number and a service carton.
2.
Remove the top foam piece. If the plastic liner is available, use it to enclose the warming unit.
3.
Lower the warming unit carefully into the carton.
4.
Replace the top foam piece. Observe proper orientation. Hose will extend out in the corner of foam.
5.
Lay the warming unit hose on top of the foam piece around the edge.
6.
Seal the carton with tape.
OUTSIDE THE USA
7.
Apply the shipping label addressed to 3M Health Care.
Contact your local distributor concerning in-warranty repair and exchange.
8.
Write the RA number on the outside of the carton.
9.
Ship to 3M Health Care.
12
PDF Scaled at 75.0%
Guidance and manufacturer’s declaration – electromagnetic immunity The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming unit should assure that it is used in such an environment.
3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
Electrostatic discharge (ESD)
IEC 60601 test level
Compliance level
±6 kV contact
±6 kV contact
±8 kV air
±8 kV air
Electrical fast transient/burst
±2 kV for power supply lines
±2 kV for power supply lines
IEC 61000-4-4
±1 kV for input/output lines
±1 kV for input/output lines
Surge
±1 kV line to line
±1 kV line to line
IEC 61000-4-5
±2 kV line(s) to earth
±2 kV line(s) to earth
Voltage dips, short interruptions and voltage variations on power supply input lines
<5% UT (>95% dip in UT) for 0,5 cycle
<5% UT (>95% dip in UT) for 0,5 cycle
40% UT (60% dip in UT) for 5 cycles
40% UT (60% dip in UT) for 5 cycles
70% UT (30% dip in UT) for 25 cycles
70% UT (30% dip in UT) for 25 cycles
<5% UT (>95% dip in UT) for 5 sec
<5% UT (>95% dip in UT) for 5 sec
3 A/m
3 A/m
IEC 61000-4-2
IEC 61000-4-11
Power frequency (50/60 Hz) magnetic field
Electromagnetic environment ‑ guidance Floors should be wood, concrete or ceramic tile. If floors are covered with synthetic material, the relative humidity should be at least 30%. Mains power quality should be that of a typical commercial or hospital environment.
Mains power quality should be that of a typical commercial or hospital environment. Mains power quality should be that of a typical commercial or hospital environment. If the user of the Model 775 warming unit requires continued operation during power mains interruptions, it is recommended that the Model 775 warming unit be powered from an uninterruptible power supply or a battery.
Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment.
IEC 61000-4-8 NOTE UT is the a.c. mains voltage prior to application of the test level.
GB / 34-8718-8817-7
13
Physical Characteristics
Guidance and manufacturer’s declaration – electromagnetic immunity The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming should assure that it is used in such an environment.
DIMENSIONS
Immunity Test
WEIGHT
IEC 60601 test level
Conducted RF IEC 61000-4-6
3 Vrms 150 kHz to 80 MHz
Radiated RF IEC 61000-4-3
3 V/m 80 MHz to 2,5 GHz
Compliance level 3 Vrms 3 V/m
Electromagnetic environment ‑ guidance
16 lb (7.3kg) Portable and mobile RF communications equipment should be used no closer to any part of the Model 775 warming unit, including cables, than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter.
RELATIVE NOISE LEVEL
Recommended separation distance
HOSE
d = 1.2
Flexible, compatible with the Model 241 blood/fluid warming set.
48 dBA (Low fan setting)
80 MHz to 800 MHz
Length: 80” (203 cm)
d = 2.3
800 MHz to 2,5 GHz
UNIT INTAKE FILTER
Field strengths from fixed RF transmitters, as determined by an electromagnetic site surveya, should be less than the compliance level in each frequency range.b Interference may occur in the vicinity of equipment marked with the following symbol:
At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people. a
53 dBA (High fan setting)
d = 1.2
where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer and d is the recommended separation distance in meters (m).
NOTE 1
13” high x 13” deep x 14” wide (33 cm high x 33 cm deep x 36 cm wide)
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Model 775 warming unit is used exceeds the applicable RF compliance level above, the Model 775 warming unit should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-orienting or relocating the Model 775 warming unit.
MERV 14* * See Frequently Asked Questions on Filtration (p. 58)
RECOMMENDED FILTER CHANGE Every 12 months or 500 hours of use
MOUNTING Can be clamped to an IV pole, placed on a hard surface, bed rail mount, or mounted to the rolling cart accessory.
Temperature Characteristics RECOMMENDED OPERATING ENVIRONMENT TEMPERATURE: 15°C-25°C
HUMIDITY:
SAFETY SYSTEM THERMOSTAT Independent electronic circuit; thermal cutoff shuts the heater OFF to ensure hose end air remains below 46°C to 56°C; back-up over-temperature detection at hose inlet.
ALARM SYSTEM Over-temperature (46°C to 56°C): red Over‑temp indicator light flashes, alarm sounds, heater and blower shut down, operating indicator lights turn OFF, and the user can no longer adjust the warming unit using the control panel.
FAULT: Fault indicator light flashes, alarm sounds.
OVERCURRENT PROTECTION Dual input fused lines.
Electrical Characteristics HEATING ELEMENT 1400 W Resistive
LEAKAGE CURRENT Meets UL 60601-1 and IEC 60601-1 requirements.
BLOWER MOTOR OPERATING SPEED: 4,700 rpm (high fan setting) 4,100 rpm (low fan setting)
AIRFLOW: Up to 48 cfm or 23 L/s
Max relative humidity 80% (up to 31°C) decreasing linearly to 50% relative humidity at 40°C.
POWER CONSUMPTION
ALTITUDE:
Average: 800 W
Max 2,000m
POWER CORD
TEMPERATURE CONTROL
15 ft., SJT, 3 cond., 13 A
Recommended separation distances between portable and mobile RF communications equipment and the Model 775 warming unit
Electronically controlled.
15 ft., SJT, 3 cond., 15 A
The Model 775 warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the Model 775 warming unit can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the Model 775 warming unit as recommended below, according to the maximum output power of the communications equipment.
HEAT GENERATED High fan setting:
4.6 m, HAR, 3 cond., 10 A
1600 BTU/hr (average), 470 W (average)
110-120 VAC, 50/60 Hz, 11.7 A, or
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Rated maximum output power of transmitter W
Separation distance according to frequency of transmitter m 150 kHz to 80 MHz
80 MHz to 800MHz
800 MHz to 2,5 GHz
d = 1.2
d = 1.2
d = 2.3
0,01
0.12
0.12
0.23
0,1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer. NOTE 1
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.
DEVICE RATINGS
Low fan setting:
220-240 VAC, 50/60 Hz, 7.2 A, or
1330 BTU/hr (average), 390 W (average)
100 VAC, 50/60 Hz, 15 A
OPERATING TEMPERATURES
FUSES TYPE:
Average temperatures at the end of the hose: HIGH: 43° ± 1.5°C (109.4° ± 2.7°F) MED:
38° ± 1.5°C (100.4° ± 2.7°F)
LOW:
32° ± 1.5°C (89.6° ± 2.7°F)
Fast acting ceramic fuses, 250 VAC
AMP RATING: 12 A (110 - 120 VAC)
TIME TO REACH OPERATING TEMPERATURE
8 A (220 - 240 VAC)
2 - 5 minutes (dependent on blanket model)
15 A (100 VAC)
Time required for the contact surface temperature to heat up from 23 ± 2°C to 37°C (73 ± 2°F to 99°F).
OPERATING SPEED:
STORAGE/TRANSPORT TEMPERATURE
At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Peak: 1550 W
-20°C to 45°C (-4°F to 113°F) Store all components in a cool, dry place when not in use.
F (Fast Acting)
BREAKING CAPACITY: 15 A, 12 A: 750 A @ 250 Vac 15 A, 12 A: 10,000 A @ 125 Vac 8 A: 200 A @ 250 Vac 8 A: 10,000 A @ 125 Vac
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Physical Characteristics
Guidance and manufacturer’s declaration – electromagnetic immunity The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model 775 warming should assure that it is used in such an environment.
DIMENSIONS
Immunity Test
WEIGHT
IEC 60601 test level
Conducted RF IEC 61000-4-6
3 Vrms 150 kHz to 80 MHz
Radiated RF IEC 61000-4-3
3 V/m 80 MHz to 2,5 GHz
Compliance level 3 Vrms 3 V/m
Electromagnetic environment ‑ guidance
16 lb (7.3kg) Portable and mobile RF communications equipment should be used no closer to any part of the Model 775 warming unit, including cables, than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter.
RELATIVE NOISE LEVEL
Recommended separation distance
HOSE
d = 1.2
Flexible, compatible with the Model 241 blood/fluid warming set.
48 dBA (Low fan setting)
80 MHz to 800 MHz
Length: 80” (203 cm)
d = 2.3
800 MHz to 2,5 GHz
UNIT INTAKE FILTER
Field strengths from fixed RF transmitters, as determined by an electromagnetic site surveya, should be less than the compliance level in each frequency range.b Interference may occur in the vicinity of equipment marked with the following symbol:
At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people. a
53 dBA (High fan setting)
d = 1.2
where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer and d is the recommended separation distance in meters (m).
NOTE 1
13” high x 13” deep x 14” wide (33 cm high x 33 cm deep x 36 cm wide)
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Model 775 warming unit is used exceeds the applicable RF compliance level above, the Model 775 warming unit should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-orienting or relocating the Model 775 warming unit.
MERV 14* * See Frequently Asked Questions on Filtration (p. 58)
RECOMMENDED FILTER CHANGE Every 12 months or 500 hours of use
MOUNTING Can be clamped to an IV pole, placed on a hard surface, bed rail mount, or mounted to the rolling cart accessory.
Temperature Characteristics RECOMMENDED OPERATING ENVIRONMENT TEMPERATURE: 15°C-25°C
HUMIDITY:
SAFETY SYSTEM THERMOSTAT Independent electronic circuit; thermal cutoff shuts the heater OFF to ensure hose end air remains below 46°C to 56°C; back-up over-temperature detection at hose inlet.
ALARM SYSTEM Over-temperature (46°C to 56°C): red Over‑temp indicator light flashes, alarm sounds, heater and blower shut down, operating indicator lights turn OFF, and the user can no longer adjust the warming unit using the control panel.
FAULT: Fault indicator light flashes, alarm sounds.
OVERCURRENT PROTECTION Dual input fused lines.
Electrical Characteristics HEATING ELEMENT 1400 W Resistive
LEAKAGE CURRENT Meets UL 60601-1 and IEC 60601-1 requirements.
BLOWER MOTOR OPERATING SPEED: 4,700 rpm (high fan setting) 4,100 rpm (low fan setting)
AIRFLOW: Up to 48 cfm or 23 L/s
Max relative humidity 80% (up to 31°C) decreasing linearly to 50% relative humidity at 40°C.
POWER CONSUMPTION
ALTITUDE:
Average: 800 W
Max 2,000m
POWER CORD
TEMPERATURE CONTROL
15 ft., SJT, 3 cond., 13 A
Recommended separation distances between portable and mobile RF communications equipment and the Model 775 warming unit
Electronically controlled.
15 ft., SJT, 3 cond., 15 A
The Model 775 warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the Model 775 warming unit can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the Model 775 warming unit as recommended below, according to the maximum output power of the communications equipment.
HEAT GENERATED High fan setting:
4.6 m, HAR, 3 cond., 10 A
1600 BTU/hr (average), 470 W (average)
110-120 VAC, 50/60 Hz, 11.7 A, or
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Rated maximum output power of transmitter W
Separation distance according to frequency of transmitter m 150 kHz to 80 MHz
80 MHz to 800MHz
800 MHz to 2,5 GHz
d = 1.2
d = 1.2
d = 2.3
0,01
0.12
0.12
0.23
0,1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer. NOTE 1
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.
DEVICE RATINGS
Low fan setting:
220-240 VAC, 50/60 Hz, 7.2 A, or
1330 BTU/hr (average), 390 W (average)
100 VAC, 50/60 Hz, 15 A
OPERATING TEMPERATURES
FUSES TYPE:
Average temperatures at the end of the hose: HIGH: 43° ± 1.5°C (109.4° ± 2.7°F) MED:
38° ± 1.5°C (100.4° ± 2.7°F)
LOW:
32° ± 1.5°C (89.6° ± 2.7°F)
Fast acting ceramic fuses, 250 VAC
AMP RATING: 12 A (110 - 120 VAC)
TIME TO REACH OPERATING TEMPERATURE
8 A (220 - 240 VAC)
2 - 5 minutes (dependent on blanket model)
15 A (100 VAC)
Time required for the contact surface temperature to heat up from 23 ± 2°C to 37°C (73 ± 2°F to 99°F).
OPERATING SPEED:
STORAGE/TRANSPORT TEMPERATURE
At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
Peak: 1550 W
-20°C to 45°C (-4°F to 113°F) Store all components in a cool, dry place when not in use.
F (Fast Acting)
BREAKING CAPACITY: 15 A, 12 A: 750 A @ 250 Vac 15 A, 12 A: 10,000 A @ 125 Vac 8 A: 200 A @ 250 Vac 8 A: 10,000 A @ 125 Vac
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CERTIFICATIONS
Maintenance Log
IEC 60601-1; IEC/EN 60601-1-2; UL 60601-1; CAN/CSA-C22.2, No.601.1; EN 55011: EN 80601-2-35 and in accordance with Canadian/CSA C22.2, No. 601.1. Classified under the Medical Device Directive as a Class IIb device.
Date
Maintenance Action Performed
CLASSIFICATION MEDICAL - GENERAL MEDICAL EQUIPMENT AS TO ELECTRICAL SHOCK, FIRE AND MECHANICAL HAZARDS ONLY IN ACCORDANCE WITH UL 60601‑1; CAN/ CSA‑C22.2, No.601.1; ANSI/AAMI ES60601‑1:2005 CSA‑C22.2 No. 60601‑1:08; EN 80601‑2‑35; Control No.4HZ8. Classified under IEC 60601-1 Guidelines (and other national versions of the Guidelines) as Class I, Type BF, Ordinary equipment, Continuous operation. Not suitable for use in the presence of flammable anesthetic mixtures with air or with oxygen or nitrous oxide. Classified by Underwriters Laboratories Inc. with respect to electric shock, fire and mechanical hazards only, in accordance with UL 60601-1
DIAGNOSTICS A qualified service technician can perform over-temperature detection system testing, temperature output testing, operating temperature calibration, and fault code troubleshooting.
Maintenance Checklist FILTER INSPECTION 1.
Remove and inspect the filter.
2.
Return filter or replace as necessary.
Note: Replace every 12 months or every 500 hours (PN 90047).
CALIBRATE THE OPERATING TEMPERATURE 1. 2. 3.
4.
Attach the Model 22110 temperature test unit to the end of the warming unit hose. Run in Ambient mode and high fan setting (
Enter the calibration mode.
) for 10 minutes.
a.
Press the Alternate Mode button and Ambient button, together for approximately 3-seconds.
b.
Temperature measured at end of hose will display on LCD.
Adjust Bair Hugger warming unit displayed temperature so it matches test unit sensor as close as possible (± .1° increments). a.
32°C button lowers displayed temperature.
b.
38°C button raises displayed temperature.
Note: Warming unit can only adjust ± 3.0°C. Try a different hose if more adjustment is required and call 3M technical support with results. 5.
Save Settings – Press the Alternate Mode button to save your settings.
TEST OVER TEMPERATURE DETECTION SYSTEM 1.
1. Run in Ambient mode and high fan setting (
2.
Initiate over-temperature test a.
3.
) for 5 minutes.
Press the Alternative Mode and 43°C button together for approximately 3-seconds.
b.
Wait as warming unit executes self test.
c.
Two beeps indicate test has completed.
Review Results a.
Observe the temperature is 46°C to 56°C.
b.
Pass or fail indicated on display.
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3M™ Bair Hugger™ Warming Unit Model 775 – Service Manual
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CERTIFICATIONS
Maintenance Log
IEC 60601-1; IEC/EN 60601-1-2; UL 60601-1; CAN/CSA-C22.2, No.601.1; EN 55011: EN 80601-2-35 and in accordance with Canadian/CSA C22.2, No. 601.1. Classified under the Medical Device Directive as a Class IIb device.
Date
Maintenance Action Performed
CLASSIFICATION MEDICAL - GENERAL MEDICAL EQUIPMENT AS TO ELECTRICAL SHOCK, FIRE AND MECHANICAL HAZARDS ONLY IN ACCORDANCE WITH UL 60601‑1; CAN/ CSA‑C22.2, No.601.1; ANSI/AAMI ES60601‑1:2005 CSA‑C22.2 No. 60601‑1:08; EN 80601‑2‑35; Control No.4HZ8. Classified under IEC 60601-1 Guidelines (and other national versions of the Guidelines) as Class I, Type BF, Ordinary equipment, Continuous operation. Not suitable for use in the presence of flammable anesthetic mixtures with air or with oxygen or nitrous oxide. Classified by Underwriters Laboratories Inc. with respect to electric shock, fire and mechanical hazards only, in accordance with UL 60601-1
DIAGNOSTICS A qualified service technician can perform over-temperature detection system testing, temperature output testing, operating temperature calibration, and fault code troubleshooting.
Maintenance Checklist FILTER INSPECTION 1.
Remove and inspect the filter.
2.
Return filter or replace as necessary.
Note: Replace every 12 months or every 500 hours (PN 90047).
CALIBRATE THE OPERATING TEMPERATURE 1. 2. 3.
4.
Attach the Model 22110 temperature test unit to the end of the warming unit hose. Run in Ambient mode and high fan setting (
Enter the calibration mode.
) for 10 minutes.
a.
Press the Alternate Mode button and Ambient button, together for approximately 3-seconds.
b.
Temperature measured at end of hose will display on LCD.
Adjust Bair Hugger warming unit displayed temperature so it matches test unit sensor as close as possible (± .1° increments). a.
32°C button lowers displayed temperature.
b.
38°C button raises displayed temperature.
Note: Warming unit can only adjust ± 3.0°C. Try a different hose if more adjustment is required and call 3M technical support with results. 5.
Save Settings – Press the Alternate Mode button to save your settings.
TEST OVER TEMPERATURE DETECTION SYSTEM 1.
1. Run in Ambient mode and high fan setting (
2.
Initiate over-temperature test a.
3.
) for 5 minutes.
Press the Alternative Mode and 43°C button together for approximately 3-seconds.
b.
Wait as warming unit executes self test.
c.
Two beeps indicate test has completed.
Review Results a.
Observe the temperature is 46°C to 56°C.
b.
Pass or fail indicated on display.
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