3M Bair Hugger Model 750 Service Manual July 2013

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3 Bair Hugger

Model 750 Warming Unit

Service Manual

English  1

Français  33

Deutsch  67

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Table of Contents Introduction� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Description of the Total Temperature Management™ System � � � � � � � � � � � � � � � � � � � � � � � Indications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Definition of Symbols � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Explanation of Signal Word Consequences � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Contraindications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � warning  � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Cautions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Notices � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Proper Use and Maintenance � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Read Before Servicing Equipment � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Safety Inspection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

1 1 1 2 3 3 3 4 5 5 5 5

Overview  � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6 Unit Power-On-Reset � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6 Operating Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7 Standby Mode � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7 Fault Conditions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8 Over-Temperature Condition � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8 Alternative Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9 Accessing the Alternative Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10 Exiting an Alternative Mode � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10 Service Procedures � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Calibrating the Operating Temperatures � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Testing the Over-Temperature Detection System � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Viewing the Fault Code Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Clearing the Fault Code Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Fault Code Table � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Viewing the Hour Meter  � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Viewing the Operating Timer � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Replacing the Air Filter � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Replacing the Hose� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Reattaching Hose � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Replacing the Fuses � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

11 11 13 15 15 16 17 17 18 19 20 21

General Maintenance and Storage � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Cleaning the Cabinet and Hose � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Storage � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

23 23 23

Troubleshooting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Technical Support and Customer Service � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � When You Call for Technical Support� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � In-Warranty Repair and Exchange� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Returning Units for Service � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

26 26 26 27

Specifications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Maintenance Checklist � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Maintenance Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

30 31

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Bair Hugger Model 750 Temperature Management Unit Service Manual

2

Introduction Description of the Total Temperature Management™ System The 3MTM Bair HuggerTM brand Total Temperature Management system consists of a Model 750 forced-air temperature management unit (with optional rolling stand, and other accessories) and disposable components, including Bair Hugger forced-air blankets, the 3MTM 241TM blood/fluid warming set, and may be used with the 3MTM Bair PawsTM patient warming gowns. The Bair Hugger warming unit is attached to the blanket or gown by means of a flexible hose. Warm air is generated in the unit and flows through the hose and into the blanket or gown. Depending on the model, the 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 fluid warming applications, the Model 241 blood/fluid warming set is inserted in the warming unit hose. When the unit is turned ON and a temperature setting is selected, warm air flows over the Model 241 tubing and warmed fluid exits from the distal end of the tubing. For additional information on Bair Hugger blankets, Bair Paws gowns, the 241 blood/fluid warming set, or other accessories visit us online at bairhugger.com or bairpaws.com. This manual includes operating and service instructions and unit specifications for the Model 750 temperature management unit. You can use the Model 750 temperature management unit in all clinical settings where the patient may become too warm or too cold including the operating room to provide patient temperature management. For information about using Bair Hugger blankets, Bair Paws gowns or the 241 blood/fluid warming set with the Model 750 temperature management unit, refer to the “Instructions for Use” included with each of these disposable components. The Bair Hugger system should only be used by trained medical professionals.

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 become too warm or too cold. The temperature management system can be used with adult and pediatric patients.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

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; 2005 for requirements. Fuse Nonexplosion proof  Type BF equipment (patient applied)

VAC V

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 Consult operator's manual

Consult instructions for use Recycle to avoid environmental contamination. This product contains recyclable parts. For information on recycling - please contact your nearest 3M Service Center for advice. Manufacturer Attention; see instructions for use Keep dry Temperature limits

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Bair Hugger Model 750 Temperature Management Unit Service Manual

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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.

Contraindications Do not apply heat to lower extremities during aortic cross-clamping. Thermal injury may occur if heat is applied to ischemic limbs.

WARNING 1. Do not leave patients with poor perfusion unmonitored during prolonged warming therapy sessions. Thermal injury may result. 2. The Bair Hugger temperature management unit has been designed to operate safely ONLY with 3M Patient Warming disposable components. 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 unit being used in conjunction with product other than 3M Patient Warming products.) 3.

Do not warm patients with the temperature management unit hose alone. Thermal injury may result. Always connect the hose to a Bair Hugger blanket or Bair Paws gown before providing therapy.

4. Do not place the non-perforated side of the blanket on the patient. Thermal injury may result. Always place the perforated side (the side with small holes) towards the patient. 5. Do not continue temperature management therapy if the Over-temp indicator light illuminates and the alarm sounds. Thermal injury may result. Unplug the unit, and contact a qualified service technician. 6. Do not continue 241 blood/fluid warming therapy if the Over-temp indicator light illuminates and the alarm sounds. Immediately stop fluid flow, and discard the blood/fluid warming set. Unplug the temperature management unit, and contact a qualified service technician. 7. Do not use a forced-air warming device over transdermal medication. Increased drug delivery and patient injury or death may occur. 8. Do not allow the patient to lie on the warming unit hose or allow the hose to directly contact the patient’s skin during patient warming; thermal injury may result. 9. Reusable blankets made from woven fabric, or blankets without discrete, visible holes, can cause the safety system of this unit to fail, which may result in serious thermal injury. This warming unit has been designed to operate safely ONLY with Bair Hugger blankets and Bair Paws gowns. 10. Do not connect a Bair Hugger blanket, 241 blood/fluid warmer, or Bair Paws gown to the warming unit if it has been cut or damaged; thermal injury may result.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

11. Do not use a Bair Hugger blanket to transfer or move the patient; injury may result. 12. To reduce the risks associated with hazardous voltage and fire: • keep power cord visible and accessible at all times. The plug on the power cord serves as the disconnect device. The wall socket outlet shall be as close as practical and shall be easily accessible. • 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 warming unit, power cord or any component is damaged. Contact 3M Patient Warming technical support at 1-800-733-7775. • this equipment must only be connected to a supply mains with protective earth. 13. To reduce the risks associated with exposure to biohazards always perform the decontamination procedure prior to returning the warmer for service and prior to disposal. 14. Do not retain the patient using a warming blanket alone, as injury may result. Use a draw sheet, safety strap, or other means to retain the patient. 15. Do not modify this equipment without authorization of the manufacturer. 16. To ground this Bair Hugger warming unit, only connect to receptacles marked “Hospital Only” “Hospital Grade,” or a reliable grounded outlet.

CAUTIONS 1. Except for specific blanket models, Bair Hugger blankets are not sterile and are all intended for single patient use ONLY. Placing a sheet between the Bair Hugger blanket and the patient does not prevent contamination of this product. 2. Monitor the temperature and cutaneous response of patients who are incapable of reacting, communicating and/or who are without a sense of feeling every 10-20 minutes or according to institutional protocol. Monitor the patient's vital signs regularly. Adjust air temperature or discontinue therapy when the therapeutic goal is reached or if vital sign instability occurs. Notify physician of vital sign instability immediately. 3. Do not leave pediatric patients unattended during therapy. 4. Do not initiate temperature management therapy unless the temperature management unit is free from mechanical damage and is safely placed on a hard surface or securely mounted. Otherwise, injury may result. 5. To prevent tipping, clamp the Model 750 temperature management unit to an IV pole at a height that provides stability. We recommend clamping the unit no higher than 44" (112 cm) on an IV pole with a minimum 28" (71 cm) diameter wheelbase. Failure to do so may result in IV pole tipping, catheter site trauma, and patient injury. 6. Electrical shock hazard. Do not disassemble the temperature management unit unless you are a qualified service technician. There are electrically live parts with in the unit when it is connected to a power source, even when the unit is in Standby mode. 7. To reduce the risks associated with environmental contamination follow applicable regulations when disposing of this device or any of its electronic components.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

6

NOTICES 1. The Bair Hugger temperature management unit meets medical electronic interference requirements. If radio frequency interference with other equipment should occur, connect the unit to a different power source. 2. Federal law (USA) restricts this device to sale by or on the order of a licensed healthcare professional. 3. To avoid Bair Hugger warming unit damage: • do not immerse the Bair Hugger warming unit or warming unit parts or accessories in any liquid or subject them to any sterilization process. • do not use solvents such as acetone or thinner to clean the warming unit; avoid abrasive cleaners. • clean warming unit exterior with soft cloth using plain water or a mild, all-purpose or nonabrasive cleaner.

Proper Use and Maintenance 3M Patient Warming assumes no responsibility for the reliability, performance, or safety of the temperature management unit if the following events occur: • Modifications or repairs are performed by unqualified personnel. • The unit is used in a manner other than that described in the Operator’s or Service Manuals. • The unit is installed in an environment that does not meet the appropriate electrical and grounding requirements.

Read Before Servicing Equipment All repair, calibration, and servicing of the Bair Hugger model 750 temperature management unit requires 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 750 Service Manual provides the technical information needed to service the unit, or 3M Patient Warming will provide that information on request. Perform all repairs and maintenance in accordance with the instructions in the Service Manual.

Safety Inspection Perform a safety inspection after making repairs to the Bair Hugger temperature management unit and before returning the 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.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

Overview

When you connect the Model 750 temperature management unit to a grounded power source, the unit automatically performs the power-on-reset operation described below. Following the power-on-reset operation, the unit will enter the Standby mode. You can select any operating mode by pressing the appropriate button on the unit’s control panel. See Figure 1.

Alternative Mode button

Figure 1. Control panel

Unit Power-On-Reset The Model 750 temperature management unit performs the following power-on-reset sequence after you connect the unit to a grounded power source: • Performs all self-test functions. • Illuminates all indicator lights and all pixels in the alphanumeric display momentarily. • Displays the text “MD 700’s” and the software revision level in the alphanumeric display. • Produces 3 chirping sounds. • Enters the Standby mode. If the temperature management unit loses power for less than 1 second, the unit’s software will remain in the operating mode you selected prior to the power loss. If the unit loses power for longer than 1 second, the unit’s software will reset when you restore power. The unit will then enter the Standby mode.

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Operating Modes The Model 750 temperature management unit has 4 operating modes: Ambient, 32°C, 38°C, 43°C. To select the 32°C, 38°C, 43°C, or Ambient mode, press the corresponding button. The temperature management unit will operate within the specified temperature range, shown in the table below.

Temperature Mode

Temperature of Delivered Air

32°C

32°C ± 1.5°C

38°C

38°C ± 1.5°C

43°C

43°C ± 1.5°C

Ambient Unit will supply air that is slightly warmer than room temperature After you select a temperature mode, the following events occur: • Corresponding indicator light illuminates. • Blower operates. • Heater activates except in Ambient mode. • Temperature mode timer and hour meter activate. • Temperature at the blanket-end of the hose appears in the alphanumeric display. • T  emp 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.

Standby Mode To place the unit in Standby mode, press the Standby button. When in Standby mode, the following events occur: • Standby indicator light illuminates. • Blower and heater turn off. • Alphanumeric display deactivates. • Temperature mode timer pauses. • Alarm and fault detection functions remain active. * Within ±3°C in units with < Rev L software. The Rev version appears in the display window upon connection to a power source.

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Fault Conditions The Model 750 temperature management unit’s software recognizes several nonhazardous fault conditions including: • Sensor failures • Heater failures • Computer failure • Software failure • Keypad failure • Power supply failure • Blower motor failure • Forced over-temperature test failure When a fault condition exists, the following events occur: • Fault indicator light flashes. • Audible alarm sounds. • Blower heater turns off. • Fault code appears in the alphanumeric display. • Up to 5 fault codes are stored in memory. When the audible alarm sounds, press any button on the keypad to temporarily silence it. The temperature management unit must be unplugged before it can be restarted. See Viewing the Fault Code Log and the Fault Code Table for more information about specific fault codes.

Over-Temperature Condition When an overtemperature condition exists, the following events occur: • Over-temp indicator light flashes. • Audible alarm sounds. • Blower and heater turn off. • Fault code appears in the alphanumeric display (see Fault Code Table). When the audible alarm sounds, press any button on the keypad to temporarily silence it. The temperature management unit must be unplugged before it can be restarted. * Up to 3 fault codes in units with < Rev L software. The Rev version appears in the display window upon connection to a power source.

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Alternative Modes The Model 750 temperature management unit has 5 Alternative modes that allow access to the service and calibration utilities of the unit.

Alternative Modes

Description

AltMode0

Hour meter

AltMode1

Calibration

AltMode2

Fault code log

AltMode3

System information

AltMode4

Over-temperature detection test

The Hour Meter mode displays the cumulative amount of operating time (in Ambient, Low, Medium, and High modes) the temperature management unit has accrued since the initialization of EEPROM. The time is displayed in whole hours only. The Calibration mode allows a technician to check and adjust the hose end sensor calibration. This should be done as part of routine maintenance and always after servicing the temperature management 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 temperature management 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. 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 17 for more information about a particular fault code. 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. The Over-temperature Detection Test mode allows the user to test the operation of the independent overtemperature shutdown system.

* The last 3 fault codes in units with < Rev L software. The Rev version appears in the display window upon connection to a power source.

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Accessing the Alternative Modes To access the Alternative modes, you must press the Alternative Mode button that is located on the front panel of the temperature management unit but is unlabeled. Press the text on the Bair Hugger logo when the instructions direct you to press the Alternative Mode button. Over-temperature Detection Test AltMode4

System Information AltMode3 Alternative Mode button

Fault Code Log AltMode2 Calibration AltMode1 Figure 2. Location of Alternative Mode button

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 from the list above.

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.

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Service Procedures caution

Auto tester must not interrupt the voltage during unit on power reset or an error 053/054 may result.

Calibrating the Operating Temperatures caution

Perform all temperature testing of the temperature management unit with a 3M Patient Warming Model 22110 Temperature Test Unit. 3M Patient Warming assumes no responsibility for the reliability, safety, or performance of the Bair Hugger system if temperature tests or adjustments are made in any manner other than those described here. Improper measurement or adjustment of the temperature management unit’s normal operating temperature could result in patient exposure to temperatures outside of the indicated range and may lead to patient injury.

Service frequency Every 6 months or 500 hours of use, or whenever service is performed.

Tools/equipment Model 22110 Temperature Test Unit

NOTES: • Th  e Model 22110 Temperature Test Unit simulates the operating characteristics of Bair Hugger blankets when used with Bair Hugger temperature management units. • W  hen 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’s 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.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

Method Note: If the temperature management unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the calibration procedure. 1. Attach the Model 22110 temperature test device to the end of the temperature management unit hose. 2. Connect the temperature management unit to a grounded power source. The unit performs a self-test and automatically proceeds to Standby mode. 3. Press the Ambient button to place the unit in Ambient mode. Allow the unit to run in Ambient mode for at least ten minutes to equalize the temperature of the unit’s internal components. 4. Press the Alternative Mode button (see Figure 2) and the Ambient button simultaneously for 3 seconds. The temperature management unit is now in Calibration mode. In this mode, the temperature management unit performs the following tasks: • 37 °C and 38 °C indicator lights flash. • Blower activates. • Heater elements deactivate. • The text “TMP” and the temperature in °C (0.1°C resolution) at the end of the hose appear in the alphanumeric display. • The text “OS” and the current calibration offset value (0.1°C resolution) appear in the alphanumeric display. 5. Compare the temperature shown on the alphanumeric display and the temperature on the independent, temperature calibration device. • If the temperatures match, press the Alternative Mode button to return the temperature management unit to Standby mode. • If the temperatures do not match, adjust the temperature management unit’s displayed temperature: 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 temperature management 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 calibration device. c. Press the Alternative Mode button to store the calibration offset value and return the temperature management unit to Standby mode. Note: If it is necessary to enter an offset value greater than ±3°C, there may be a defect in the hose end sensor. Remove unit from service until a new hose assembly can be substituted.

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Testing the Over-Temperature Detection System warning

Do not perform the over-temperature detection system test while the temperature management unit is being used for temperature management therapy. Thermal injury may result. caution

Connect each warming unit being tested to a separate power source.

Service frequency Every 6 months or 500 hours of use, or whenever service is performed.

Tools/equipment Model 22110 Temperature Test Unit

Method note: If continuing from previous section (Calibrating the Operating Temperature) skip to step 4. note: If the temperature management unit has been stored at a temperature lower than 20°C, allow it to reach ambient temperature before beginning the test. 1. Connect the temperature management unit to a grounded power source. The unit performs a self-test and automatically proceeds to Standby mode 2. Connect the temperature test kit to the hose of the temperature management unit. 3. Press the Ambient button and allow the temperature management unit to run for five minutes. 4. Press the Alternative Mode button (See Figure 2) and the 43 °C button simultaneously for three seconds. The temperature management unit is now in a Forced Over-temperature mode. In this mode, the temperature management unit performs the following tasks: • Blower activates. • Heater elements continuously operate at full power. • 43°C indicator light flashes. • Over-temperature timer activates. • “OT Test” flashes in the alphanumeric display.

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Bair Hugger Model 750 Temperature Management Unit Service Manual

5. Wait for the temperature management unit to perform the over-temperature test. When the test is complete, the temperature management unit performs the following tasks: • Heater elements deactivate. • Blower continues to operate. (note: The blower turns off if an over-temperature condition occurs during normal use.) 6. View the alphanumeric display to determine test outcome: a. PASS–The 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: 1. OT Test OT Test PASS-Prx OR PASS-Dst 2. TestTime XX Secs 3. Unplug To Reset b. FAIL–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: 1. OT Test FAIL 2. TestTime 150* Secs 3. Unplug To Reset NOTE: Do not place a temperature management unit back into service if it fails the Over-temperature Detection System test. Send the unit back to 3M Patient Warming for repair. See Returning Units for Service on page 27. 4. Record the maximum temperature displayed by the test kit. (Use maintenance log on page 32.) If the temperature is >56°C (53°C ± 3°C typical) contact 3M Patient Warming technical service for further instructions. 5. Unplug the temperature management unit to reset it. *Within 90 seconds in units with < Rev L software. The Rev version appears in the display window upon connection to a power source.

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Viewing the Fault Code Log Service frequency As often as necessary.

Tools/equipment None required.

Method 1. If your temperature management unit is already ON, you can access the fault code log from any operating mode. Otherwise, connect the temperature management unit to a grounded power source. The unit performs a self-test and automatically proceeds to Standby mode. Then select any operating mode. 2. Press the Alternative Mode button (see Figure 2: Alternative Mode button on page 11) and the 32°C button simultaneously for three seconds. The temperature management unit is now in Fault Code Log mode. In this mode, the temperature management unit performs the following tasks: 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 Fault Code Table on page 16 for a list of fault codes and their meanings. d. The time (HH:MM:SS) of each fault appears below “FC(n) XXX” in the alphanumeric display. If the unit reaches 100 or more hours the time only reads hours and minutes. 3. Press either the 32°C or 38°C button to view the next fault code in the log. The temperature management unit stores a maximum of 5 fault codes in non-volatile memory. 4. Press the Alternative Mode button to return the temperature management unit to its previous operating mode.

Clearing the Fault Code Log Put the 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.

Note The fault code log should not be cleared unless instructed to do so by a 3M Patient Warming representative.