3M Bair Hugger Model 775 Service Manual July 2013

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 Bair Hugger

Temperature Management Unit Model 775

Service Manual

English1 Français31 Deutsch65

English 202526A

Check the 3MTM Bair HuggerTM therapy website to ensure you have the most recent version of this document.

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Table of Contents Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

2

Definition of Symbols � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

2

Explanation of Signal Word Consequences � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Indications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Contraindications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Warnings � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Cautions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Notices � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Proper Use and Maintenance � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

6

Read Before Servicing Equipment � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

6

Safety Inspection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Overview  � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Operating Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Airflow Modes� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Standby Mode � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Fault Conditions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Over-Temperature Condition � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Alternative Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Accessing the Alternative Modes � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Exiting an Alternative Mode � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Service Procedures � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Testing the Over-Temperature Detection System � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Viewing the Fault Code Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Clearing the Fault Code Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Fault Code Table � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Viewing the Hour Meter  � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Viewing the Operating Timer � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Replacing the Air Filter � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Replacing the Hose� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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General Maintenance and Storage � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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

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Technical Support and Customer Service � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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In-Warranty Repair and Exchange� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Returning Units for Service � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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

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Maintenance Checklist � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Description of the Total Temperature Management™ System � � � � � � � � � � � � � � � � � � � � � � �

Unit Power-On-Reset � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

Calibrating the Operating Temperature � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

Cleaning the Warming Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

When You Call for Technical Support� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

Maintenance Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �

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Bair Hugger Model 775 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 775 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 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 775 temperature management unit. You can use the Model 775 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 775 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 professional.

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 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 High fan setting

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Bair Hugger Model 775 Temperature Management Unit Service Manual

Low fan setting Nonexplosion proof Consult instructions for use Follow 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. Date of manufacture Manufacturer Attention; see instructions for use Keep dry Temperature limit

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.

Indications

The Bair Hugger system is intended to prevent and treat hypothermia. In addition, the Model 775 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.

Contraindications

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

WARNINGS

1. Do not leave patients with poor perfusion unmonitored during prolonged warming therapy sessions. Thermal injury may result.

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Bair Hugger Model 775 Temperature Management Unit Service Manual

4

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 products 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. 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.

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Bair Hugger Model 775 Temperature Management Unit Service Manual

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 775 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 within 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.

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 of warming unit parts of 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.

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Bair Hugger Model 775 Temperature Management Unit Service Manual

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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 775 temperature management 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 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 Model 775 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 775 Temperature Management Unit Service Manual

7

Overview

When you connect the Bair Hugger Model 775 Temperature Management Unit to a grounded power source, the unit automatically performs the power-on-reset operation described below. Following the power-onreset 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. Temperature Modes H

IGH

High Fan Setting

43˚C D ME

Low Fan Setting W LO

Model 775 TEMP IN RANGE

AMBIENT

FAULT OVER TEMP

STANDBY

Figure 1. Control panel

Unit Power-On-Reset

The Bair Hugger Model 775 temperature management unit automatically performs the following power-onreset sequence after you connect the unit to a properly grounded power source: • Performs all self-test functions. • Illuminates 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. • Sounds the alarm (three low-level clicks). • Enters the Standby mode with the high fan (

) setting selected by default.

note: The low fan setting indicator light will not illuminate during power up.

If the Bair Hugger Model 775 Temperature Management Unit loses power for less than 1 second, the unit’s software will return the unit to the operating mode you selected prior to the power loss. However, if the temperature management 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 with the high fan setting selected by default.

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8

Operating Modes

The Model 775 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.

Airflow Modes

The Model 775 has two preset fan speed settings: a default or high fan setting ( )and a reduced or low fan setting ( ). The Model 775 will reset/default to the high fan setting each time the unit is powered up or Standby is selected. The low fan setting ( ) may be pre-selected while in Standby prior to selecting the desired temperature.

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.

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Fault Conditions

The Model 775 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" on page 16 and the "Fault Code Table" on page 17 for more information about specific fault codes.

Over-Temperature Condition

When an over temperature 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 page 17). 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.

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Alternative Modes

The Bair Hugger Model 775 temperature management unit has 5 alternative modes that allow access to the service and calibration utilities of the unit (see Figure 2 on page 11).

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, 32°C, 38°C, and 43°C modes) the temperature management unit has been in use. 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 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.

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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. HIG

Over-temperature Detection Test AltMode4

H

43˚C D ME

System Information AltMode3

W LO

Alternative Mode button AltMode0

Model 775 TEMP IN RANGE

AMBIENT

Fault Code Log AltMode2

FAULT OVER TEMP

STANDBY

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.

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 Temperature caution

Perform all temperature testing of the temperature management unit with an 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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Method

Note: If the Bair Hugger Model 775 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. Note: Verify unit is set to high fan setting by ensuring the indicator light next to the upper fan is illuminated. 4. Press the Alternative Mode button (see "Figure 2. Location of Alternative Mode button" on page 11) 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: • 32°C and 38°C indicator lights flash. • Blower remains ON. • Heater elements remain OFF. • 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. 5. Compare the temperature shown on the alphanumeric display and the temperature of the Model 22110, temperature test 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 as close as possible. 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 the 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 5 minutes.

Note

Verify unit is set to the high fan ( is illuminated.

) setting by ensuring the indicator light by the upper fan

4. Press the Alternative Mode button (See "Figure 2. Location of Alternative Mode button" on page 11) and the 43°C button simultaneously for 3 seconds. The temperature management unit is now in the Over-Temperature Detection Test mode. In this mode, the temperature management unit performs the following tasks: • 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.

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Bair Hugger Model 775 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 turn OFF. • 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 26. 7. Record the maximum temperature displayed by the test kit. (Use "Maintenance Log" on page 30.) If the temperature is above 56°C, contact 3M Patient Warming technical service for further instructions. 8. After the test is complete, allow the unit to cool by running it for at least five minutes. 9. Unplug the temperature management unit to reset it to normal operation.

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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 ("Figure 2. Location of 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 page 17 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.