Bair Hugger Security Systems User manual

Warning: Electrical Shock Hazard. There are electrically live parts within the
warming unit when it is connected to a power source, even when the switches are
in the OFF or STANDBY position.
Please forward to Biomedical Engineering Department
Vorsicht: Gefährliche elektrische Spannung. In einem an das Stromnetz angeschlossenen
Wärmegerät stehen bestimmte elektrische Komponenten auch dann unter Strom, wenn
der Schalter auf AUS oder BEREITSCHAFTSMODUS geschaltet ist.
Bitte an die Abteilung für biomedizinische Technik weiterleiten
Mise en garde : Risque d’électrocution. Certaines pièces sont électriquement chargées
dans les appareils de réchauffement, lorsque ceux-ci sont connectés à une source
d’alimentation et ce, même si l’appareil est en position OFF (arrêt) ou STANDBY (attente).
A transmettre au Service d’ingénierie biomédicale
Bair Hugger*
Model 505 Warming Unit
Service Manual
Total Temperature Management System
UNITÉ DE GESTION DE TEMPÉRATURE BAIR HUGGER MODÈLE 505 SERVICE MANUEL
BAIR HUGGER MODELL 505 TEMPERATURMANAGEMENTGERÄT SERVICE GEBRAUCHSANLEITUNG
Check the Bair Hugger therapy website to ensure you have the most recent version of this document. www.bairhugger.com reorder #200597D

Deutsch 29
Français 61
English 1
Bair Hugger*
Model 505 Warming Unit
Service Manual

Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description of the Total Temperature Management* System . . . . . . . . . . . . . . . . . . . . . . . . . 1
Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Contraindications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Read Before Servicing Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cabinet Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hose Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Board Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Air Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Over Heat Alarm Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Over Heat Alarm Thermostat Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Normal Operating Temperature Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Normal Operating Temperature Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Key to Figure 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Technical Support and Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
When You Call for Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
In-Warranty Repair and Exchange USA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Returning Units for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Maintenance Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Symbol Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Bair Hugger Model 505 Service Manual

Introduction
Description of the Total Temperature Management* System
The Bair Hugger brand Total Temperature Management
system consists of a Bair Hugger forced-air warming unit and
disposable components, including Bair Hugger forced-air
blankets and the 241* blood/fluid warming set, and Bair
Paws* patient warming gowns. The system and disposables are
intended for use in clinical settings including the operating
room. The warming unit draws ambient air through a filter and
warms the air to the specified temperature. It then delivers the
warmed air through a hose to the blanket or gown.
This manual describes how to service the Model 505 warming
unit, and includes maintenance instructions and specifications.
For information about using Bair Hugger blankets, the 241
blood/fluid warming set, or Bair Paws gowns with Bair Hugger
units, refer to the “Instructions for Use” included with each of
these disposable components.
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.
Contraindications
Do not apply heat to lower extremities during aortic
cross-clamping. Thermal injury may occur if heat is applied to
ischemic limbs.
Bair Hugger Model 505 Service Manual 1

Warnings
Do not leave patients with poor perfusion unmonitored1.
during prolonged warming therapy sessions. Thermal injury
may result.
The Bair Hugger temperature management unit has been2.
designed to operate safely ONLY with Arizant Healthcare*
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 non-Arizant Healthcare 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.
Do not place the non-perforated side of the blanket on4.
the patient. Thermal injury may result. Always place the
perforated side (that is, with small holes) towards the patient.
Do not continue temperature management therapy if the5.
over-temp indicator light illuminates and the alarm sounds.
Thermal injury may result. Unplug the unit, and contact a
qualified service technician.
Do not continue 241 blood/fluid warming therapy if the6.
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.
Do not use a forced-air warming device over transdermal7.
medication. Increased drug delivery and patient injury or
death may occur.
Do not allow the patient to lie on the warming unit hose or8.
allow the hose to directly contact the patient’s skin during
patient warming; thermal injury may result.
Equipment not suitable for use in the presence of a9.
flammable anesthetic mixture with air or with oxygen or
nitrous oxide.
Resuable blankets made from woven fabric, or blankets10.
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 safety
ONLY with Bair Hugger blankets and Bair Paws gowns.
Bair Hugger Model 505 Service Manual
2

Cautions
Except for specific blanket models, Bair Hugger blankets are1.
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.
Monitor the patient’s temperature and cutaneous response2.
every 10-20 minutes or according to institutional protocol
and 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.
Do not leave pediatric patients unattended during therapy.3.
Do not initiate temperature management therapy unless4.
the temperature management unit is safely placed on a hard
surface or securely mounted. Otherwise, injury may result.
To prevent tipping, clamp the Temperature Management5.
Unit to an IV pole at a height that provides stability.
We recommend clamping the unit no higher than 44”
(112cm) on an IV pole with a minimum 14” (35cm) radius
wheelbase. Failure to do so may result in IV pole tipping,
catheter site trauma, and patient injury.
Electrical shock hazard. Do not disassemble the temperature6.
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.
Notices
The Bair Hugger temperature management unit meets1.
medical electronic interference requirements. If radio
frequency interference with other equipment should occur,
connect the unit to a different power source.
Federal law (USA) restricts this device to sale by or on the2.
order of a licensed healthcare professional.
To reliably ground this Bair Hugger warming unit, only3.
connect to receptacles marked “Hospital Only” or “Hospital
Grade”.
Bair Hugger Model 505 Service Manual 3

Read Before Servicing Equipment
The repair, calibration, and servicing of the warming unit
requires the skill of a qualified medical equipment service
technician who is familiar with good practice for medical
device repair. If service is designated as not requiring
manufacturer’s attention, the technical information is provided
in this service manual or will be provided, on request, by
Arizant Healthcare Inc.
Refer to Service Manual
Perform all repairs and maintenance in accordance with the
instructions in this service manual.
Safety Inspection
Perform a safety inspection after making repairs to the
Bair Hugger warming unit and before returning the warming
unit to service. A safety inspection should include a test of the
operating temperatures (described in this service manual), the
Over Heat alarm system, as well as a leakage current test.
Proper Use and Maintenance
Arizant Healthcare Inc. assumes no responsibility for the
reliability, performance, or safety of the equipment if:
• Modificationsorrepairsareperformedbynon-authorized
personnel.
• Theequipmentisusedinamannerotherthanthatdescribed
in the Operator’s or Service Manuals.
• Theequipmentisinstalledinanenvironmentthatdoesnot
meet the relevant grounding requirements.
Bair Hugger Model 505 Service Manual
4

Service Procedures
Cabinet Cleaning
Tools/Equipment
Soft cloth, lightly dampened with water and mild detergent.
Method
Disconnect the warming unit from the power source.1.
Wipe the exterior of the warming unit clean.2.
CAUTION: Do not use a dripping wet cloth when cleaning the
warming unit. Moisture may seep into the electrical contacts
and damage the components. Also, do not use alcohol or other
solvents to clean the cabinet. Solvents may damage the labels and
other plastic parts.
Hose Replacement
Method
Press the tab on the blower outlet to release the existing1.
hose.
Attach the replacement hose by inserting the flange end at2.
a 45° angle in the grooved blower outlet, then snap the hose
into place. (See Figure 1.)
Figure 1. Attaching the
Replacement Hose
Insert flange into
groove and snap into
place
Press this
tab to
release
hose
Bair Hugger Model 505 Service Manual 5

Power entry
module (see
detail)
Power Fuse Replacement
The power fuses are located in the power entry module. A
spare fuse is located in the fuse carrier (see Figure 2).
Tools/Equipment
Phillips-head screwdriver
Small slotted screwdriver
Method
Disconnect the warming unit from the power source.1.
Remove the 2 Phillips-head screws that secure the cord2.
retainer. Remove the power cord.
Locate the fuse carrier in the center of the power entry3.
module (see Figure 2).
Use the small screwdriver to remove the fuse carrier from4.
the power entry module.
Remove the blown fuse(s) from the fuse carrier.5.
Place the new fuse(s) (as marked) into the fuse carrier.6.
CAUTION: Replace only with the fuse capacity and type that is
indicated on the adjacent label.
Replace the fuse carrier into the power entry module.7.
Reattach the power cord.8.
Replace the 2 Phillips-head screws to reattach the cord9.
retainer.
Reconnect the warming unit to the power source.10.
Record the maintenance action taken and the hours of11.
operation (read from the hour meter) in the Maintenance
Log section.
Spare fuse
Fuse
carrier
Detail
Figure 2. Location
of Power Fuse
Bair Hugger Model 505 Service Manual
6

Control Board Fuse Replacement
Control board fuses are located on the control board. (See
Figure 3.) The internal fuses on the Model 505 are for control
board functions only.
The power fuses are located in the power entry module.
Instructions for power fuse replacement can be found in the
Power Fuse Replacement section.
Tools/Equipment
Phillips-head screwdriver
Method
Disconnect the warming unit from the power source.1.
Turn the Model 505 unit over, so that the bottom panel is2.
facing up.
Using the Phillips-head screwdriver, remove the screw from3.
each of the 2 front feet (bumpers) and remove the feet.
Remove the Phillips-head screw from the center of the4.
upper rear panel.
Remove the 2 Phillips-head screws located under the bed5.
hooks on the upper rear panel. Turn the unit right side up.
Lift the top cover and unhook the front of the top cover6.
from the retainer bracket inside. The control panel is
located on the underside of the top cover. See Figure 3 for
location of the fuse.
Remove the fuse and replace with the new one.7.
CAUTION: Replace only with the fuse capacity and type that is
indicated on the adjacent label.
Bair Hugger Model 505 Service Manual 7

Figure 3. Location of
Control Board Fuse
Control board
fuse
Flip the top cover to access the
control board
Phillips screws
Control Board Fuse Replacement
Hook the retainer bracket onto the front of the top cover.8.
Place the top cover back into position. Replace all screws.9.
NOTE: It may be necessary to remove the air filter to correctly
position the lower portion of the retainer bracket inside the
unit.
Reconnect the warming unit to the power source.10.
Record the maintenance action taken and the hours of11.
operation (read from the hour meter) in the Maintenance
Log section.
Retainer bracket
Retainer bracket
hooks into top cover
and is secured by
screws through two
front “feet”
Bair Hugger Model 505 Service Manual
8

Air filter
Hour meter
Air Filter Replacement
The air filter is mounted in the bottom of the warming unit
(See Figure 4).
Tools/Equipment
Phillips-head screwdriver
Service Frequency
Every 6 months or 500 hours of use.
Method
Disconnect the warming unit from the power source.1.
Remove the M6 x 25 pan-head screw on the bottom on the2.
unit. The filter should slide out easily.
Record the hour meter reading and date on the new air3.
filter label. The hour meter is located in the lower left
corner of the top warning label (see Figure 4).
Slide the new filter into the base of the unit.4.
Replace the M6 x 25 pan-head screw on the bottom on the5.
unit.
Reconnect the warming unit to the power source.6.
Record the hour meter reading and maintenance action7.
taken in the Maintenance Log section.
Figure 4. Location
of Air Filter and
Hour Meter
Bair Hugger Model 505 Service Manual 9

Over Heat Alarm Testing
WARNING: Perform all testing and adjustments of warming unit
temperature with a calibrated Model 221 Temperature test kit
or a Model 22110 Temperature test unit. Arizant Healthcare Inc.
assumes no responsibility for the reliability, safety, or performance
of the Bair Hugger system if warming unit temperature testing or
adjustments are made in any other manner than that described
here. Improper measurement or adjustment of the warming
unit’s over heat alarm setting could result in patient exposure to
temperatures outside of the indicated range, and may lead to
patient injury.
NOTE: The Model 221 Temperature Test Kit and the Model 22110
Temperature Test Unit are designed to simulate the operating
characteristics of Bair Hugger blankets and Bair Paws gowns when
used with Bair Hugger warming units; use of the temperature test
device with any other warming system may result in imprecise
readings.
If using the Model 221 Test Kit, temperature readings are taken
from the test kit itself. If using the Model 22110 Test Unit,
temperature readings are taken from a calibrated temperature
meter.
Service Frequency
6-month intervals or 500 hours of use
Tools/Equipment
Phillips-head screwdriver
If using the Model 22110 Temperature Test Unit:
• Useacalibratedtemperaturemeterthatcanacceptamale
subminiature connector and read a K style thermocouple
(e.g., a Fluke Model 52 K/J Thermometer).
• Iftheconnectordoesnotfityourmeter,youcanremove
the provided connector and attach a connector that fits
your meter.
Bair Hugger Model 505 Service Manual
10

Over Heat Alarm Testing
Method
The Over Heat alarm test panel is located on the back panel of
the Model 505 (see Figure 5).
Insert the open hose end from the warming unit in the port1.
on the temperature test device (see Figure 6).
NOTE: Do not block the rear air vents on the test device.
Figure 5. Location of Over Heat
Alarm Test Panel
Test
panel
Figure 6. Model 22110 Temperature Test Unit
Connect the warming unit to the power source and turn2.
the warming unit power ON.
NOTE: The temperature setting will not affect the Over Heat
test.
Using the Phillips-head screwdriver, remove the screw on3.
the alarm test panel. The unit will go into an over heat
condition when the test panel is loose.
When the over heat alarm activates both visually and4.
audibly, note the maximum temperature achieved. Let the
alarm operate for at least 1 minute or until the temperature
read-out is approximately 38°C (100°F), then turn the
warming unit OFF and then ON; the alarm should also
turn off. The alarm and manual reset constitutes one cycle.
NOTE: If the alarm does not turn off, allow the unit to alarm for
1 more minute before turning the warming unit to STANDBY,
then ON again.
Port
Hose
Bair Hugger Model 505 Service Manual 11

Over Heat Alarm Testing
Allow the warming unit to cycle 2 times more after the first5.
satisfactory reading. When the alarm activates, note the
alarm temperature read-out. See Table 1 for specified limits.
NOTE: The first over heat cycle temperature may be slightly
higher when started from a cold start.
If the results of the test6. did not meet specified limits,
adjust the over heat thermostat. See the Over Heat Alarm
Thermostat Adjustment section.
If the results of the test7. did meet specified limits, turn the
warming unit to STANDBY, and disconnect the warming
unit from the power source.
Remove the hose end from the port on the temperature test8.
device.
Retighten the screw on the over heat alarm test panel.9.
Record the maintenance action taken and hours of10.
operation (read from the hour meter) in the Maintenance
Log section.
Table 1. Over Heat Specification
Model 500 Series High Temperature Thermostat
The thermostat interrupts power to the heater and activates
the alarm at a preset high temperature of 53° ± 3°C
(127.4° ± 5.4°F) or less at the end of the hose, as determined
by the Model 221 Temperature Test Kit or the Model 22110
Temperature Test Unit.
Bair Hugger Model 505 Service Manual
12

Over Heat Alarm Thermostat Adjustment
WARNING: Improper adjustment of the warming unit’s over heat
alarm setpoint could result in patient exposure to temperatures
outside of the indicated range, and may lead to patient injury.
• Closelyfollowinstructionsforthermostatadjustment.
• Dangerousvoltagesarepresentattheterminalsofthe
thermostat.
• AlwaysuseaModel221TemperatureTestKitoraModel22110
Temperature Test Unit to verify output temperatures.
• Recalibratethetemperaturetestkitatleastonceayear.The
Model 22110 Temperature Test Unit does not need to be
calibrated. The meter it is connected to must be calibrated.
Follow the calibration instructions in the meter service manual or
follow standard facility calibration schedules.
• Whenindoubt,contactArizantHealthcareTechnicalSupportfor
assistance in temperature adjustment.
Tools/Equipment
• Model221TemperatureTestKitoraModel22110
Temperature Test Unit
• Smallslottedscrewdriver
• Phillips-headscrewdriver
Method
Insert the open hose end from the warming unit in the port1.
on the temperature test device.
NOTE: Do not block the rear air vents on the test device.
Connect the warming unit to the power source and turn2.
the warming unit power ON.
NOTE: The temperature setting will not affect the over heat
adjustment.
Using the Phillips-head screwdriver, remove the screw on3.
the alarm test panel. Lift and remove the panel.
Bair Hugger Model 505 Service Manual 13

Figure 7. Location of Over
Heat Alarm Thermostat
Over heat alarm
thermostat access
(detail)
Over Heat Alarm Thermostat Adjustment
Locate the over heat adjustment thermostat (see Figure 7).4.
NOTE: Adjustment of the over heat alarm thermostat is most
easily done while the temperature read-out is climbing.
Use a small slotted screwdriver to adjust the thermostat.5.
• Ifthetestedalarmtemperaturewasbelow the specified
limits, turn the screwdriver CLOCKWISE to increase
the alarm temperature.
• Ifthetestedalarmtemperaturewasabove specified
limits, turn the screwdriver COUNTERCLOCKWISE
to lower the alarm temperature.
Fine-tune the adjustment until the warming unit alarms at6.
the specified temperature.
Manually turn the warming unit to STANDBY, then7.
ON again. This manual reset constitutes one cycle.
Retest the alarm temperature to verify correct adjustment at8.
least 2 times. Allow the warming unit to cycle before each
test.
When the warming unit alarm setting is within the9.
specified limit, turn the warming unit to STANDBY and
disconnect it from the power source.
Remove the hose end from the temperature test device.10.
Replace the over heat alarm test panel. Resecure the screw.11.
Record the maintenance action taken and the hours of12.
operation (read from the hour meter) in the Maintenance
Log section.
Bair Hugger Model 505 Service Manual
14

At HIGH, Nominal Temperature on Test Kit (°F)
Ambient Room Temperature (°C)
At HIGH, Nominal Temperature on Test Kit (°C)
45
44
43
42
15 16 17 18 19 20 21 22 23 24 25 26 27
Normal Operating Temperature Testing
WARNING: Perform all testing and adjustments of warming unit
temperature with a calibrated Model 221 Temperature Test Kit
or a Model 22110 Temperature Test Unit. Arizant Healthcare Inc.
assumes no responsibility for the reliability, safety, or performance
of the Bair Hugger system if warming unit temperature testing or
adjustments are made in any other manner than that 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.
Service Frequency
6-month intervals, or 500 hours of use
Tools/Equipment
Model 221 Temperature Test Kit or Model 22110 Temperature
Test Unit
Method
Insert the open hose end from the warming unit in the port1.
on the temperature test device (see Figure 6).
NOTE: Do not block the rear air vents on the test device.
Turn the warming unit power ON and select the2.
HIGH temperature setting. Always begin testing at the
HIGH setting.
Note the ambient room temperature.3.
After approximately 5 minutes of operation, note the4.
temperature read-out. Use Figure 8 to correlate ambient
temperature to the warming unit’s operating temperature.
Figure 8. Room Temperature vs. High
Temperature Output
WarmingunittemperaturesettingshouldbeonHIGHwhen
conducting this test
1
Ambient Room Temperature (°F)
Bair Hugger Model 505 Service Manual 15

Normal Operating Temperature Testing
After correcting for ambient temperature, the tested normal5.
operating temperature should meet the limits specified in
Table 2.
If the HIGH temperature setting is not within specified6.
limits, adjust the normal operating temperature. See the
Normal Operating Temperature Adjustment section.
If the HIGH temperature setting is within specified7.
limits, verify the MED and then LOW settings against
specified limits (allow the warming unit to operate at each
temperature setting for about 3 to 5 minutes
before test).
Turn the warming unit to STANDBY. Remove the hose8.
end from the port on the temperature test device.
Record the maintenance action taken and the hours of9.
operation (read from the hour meter) in the Maintenance
Log section.
Table 2. Model 500 Series Operating Temperatures
(Operating temperature = Average temperature at the end of the hose.)
HIGH: 43° ± 3°C (109.4° ± 5.4°F)
MED: 38° ± 3°C (100.4° ± 5.4°F)
LOW: 32° ± 3°C (89.6° ± 5.4°F)
Note: Air temperature reaching the patient is approximately 2°C lower than
the listed temperatures.
Bair Hugger Model 505 Service Manual
16

Normal Operating Temperature Adjustment
WARNING: Improper 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.
• Closelyfollowinstructionsfortemperatureadjustment.
• AlwaysuseaModel221TemperatureTestKitoraModel22110
Temperature Test Unit to verify output temperatures.
• AlwaysmakeadjustmentsrelativetotheHIGHtemperature
settingonthewarmingunit.WhentheHIGHsettingisaccurately
adjusted,theMEDandLOWsettingsshouldalsobewithin
specifiedlimits.IftheHIGHrangeisproperlyset,andMEDand/
orLOWdonotmeetspecs,callTechnicalService.
• Recalibratethetemperaturetestkitatleastonceayear.The
Model 22110 Temperature Test Unit does not need to be
calibrated. The meter it is connected to must be calibrated.
Follow the calibration instructions in the meter service manual or
follow standard facility calibration schedules.
• Whenindoubt,contactTechnicalServiceforassistancein
temperature adjustment.
Tools/Equipment
Model 221 Temperature Test Kit or
Model 22110 Temperature Test Unit
Small slotted screwdriver
Method
The operating temperature adjustment potentiometer may be
accessed through openings in the upper right corner of the rear
access panel (see Figure 9).
Insert the open hose end from the warming unit in the port1.
on the temperature test device.
NOTE: Do not block the rear air vents on the test device.
Turn the warming unit power ON, and allow it to operate2.
at HIGH for about 3 to 5 minutes before adjusting the
potentiometer.
Bair Hugger Model 505 Service Manual 17