Bair Paws 875 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 hand-
held temperature controller is in the OFF position.
Please forward to
Biomedical Engineering Department
Bair Paws®
Model 875
Warming Unit
Service Manual
Check the Bair Paws system website to ensure you have the most recent version of this document. www.bairpaws.com reorder #201332B

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Table of Contents
Introduction to the Bair Paws® Patient Adjustable Warming System................................................................. 1
Important Information about the Bair Paws Model 875 Warming Unit .......................................................... 2
Indications/Intended Use........................................................................................................................ 2
Contraindication..................................................................................................................................... 2
Warnings................................................................................................................................................. 2
Cautions.................................................................................................................................................. 3
Notices.................................................................................................................................................... 3
Proper Use and Maintenance .................................................................................................................. 3
Read Before Servicing Unit..................................................................................................................... 3
Safety Inspection..................................................................................................................................... 3
Preparing the Bair Paws Model 875 Warming Unit for Use ............................................................................. 4
Installing the Wall-mount Bracket.......................................................................................................... 4
Placing the Warming Unit on the Wall-mount Bracket .......................................................................... 5
Mounting the Warming Unit on an IV Pole........................................................................................... 6
Mounting the Warming Unit on a Bedrail.............................................................................................. 7
Mounting the Warming Unit with a Rail-mount to the Wall ................................................................. 8
Using the Hand-held Temperature Controller ........................................................................................ 9
Using the Holder for the Hand-held Temperature Controller................................................................. 9
Service Procedures ...........................................................................................................................................10
Calibrating the Operating Temperatures................................................................................................10
Testing the Over-temperature (OT) Circuit.......................................................................................... 13
Replacing the Filter................................................................................................................................14
Replacing the Temperature Controller and/or Hose...............................................................................15
Replacing the Power Cord......................................................................................................................18
Cleaning the Warming Unit ..................................................................................................................19
Technical Support and Customer Service ....................................................................................................... 20
U.S. Customer Service .......................................................................................................................... 20
When You Call for Technical Support .................................................................................................. 20
Repair and Exchange ............................................................................................................................ 20
Bair Paws Warming Unit Limited Warranty....................................................................................................21
Specifications.................................................................................................................................................. 22
Maintenance Log............................................................................................................................................ 24
Definition of Symbols..................................................................................................................................... 28

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Arizant Healthcare Inc.
Introduction to the Bair Paws®
Patient Adjustable Warming System
e Bair Paws patient adjustable warming system consists of the Model 875 forced-air
warming unit and disposable warming gowns. e Bair Paws Model 875 warming unit
can provide comfort warming and prewarming to patients in preoperative settings. In
postoperative settings the warming unit can provide comfort warming.
is manual includes service procedures and unit specifications for the Model 875 warming
unit. Please refer to the Instructions for Use for more information about the gowns.
Bair Paws Model 875 Warming Unit
e Bair Paws Model 875 warming unit has
the following key elements: a blower, a heating
element, and a hand-held temperature controller.
e warming unit delivers warmed air through
a hose that is connected to a port in a Bair Paws
gown. e patient can adjust the air temperature
and airflow using the temperature controller.
Bair Paws Warming Gowns e Bair Paws single-use warming gown has an
integral, channeled insert that delivers warm air
through small perforations to warm the patient.
Air channels and hose ports enable comfort and
prewarming with a Bair Paws 800 series warming
unit or clinical warming with a Bair Hugger®
500 or 700 series temperature management unit.
e gown also has Velcro® fastener strips on each
shoulder that provide easy access to the patient’s
arms and chest. e Bair Paws warming gowns
are latex-free.
VELCRO is a registered trademark of Velcro Industries B.V.
®

Bair Paws® Model 875 Warming Unit Service Manual
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Important Information about the
Bair Paws Model 875 Warming Unit
Indications/Intended Use
e Model 875 warming unit is indicated for patient warming. is warming unit has been
designed for use with the Bair Paws warming gowns in all preoperative and postoperative
settings.
Contraindication
Do not apply heat to lower extremities during aortic cross-clamping. ermal injury may
occur if heat is applied to ischemic limbs.
Warnings Do not warm patients with the warming unit’s hose alone. ermal injury
may result. Always connect the hose to a Bair Paws warming gown before
providing patient warming.
Do not continue warming if the red Over-temp indicator light illuminates or an
audible alarm sounds; thermal injury may result. Turn the warming unit OFF.
Do not use a forced-air warming device over transdermal medications; increased drug
delivery, patient death, or injury may occur.
Use only Bair Paws warming gowns with this warming unit. is warming unit
has been designed to operate safely with Bair Paws warming gowns; 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 Bair Paws warming
gowns.
Do not allow the warming unit’s hose to contact the patient’s skin during patient
warming. ermal injury may result.
Equipment not suitable for use in the presence of a flammable anaesthetic mixture
with air or with oxygen or nitrous oxide.
is warming unit is not intended for use in the operating room.
Position the temperature controller cord and the hose away from the patient’s neck or
shoulders to avoid entanglement and/or injury.
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Cautions
Do not initiate patient warming unless the warming unit is safely placed on a hard
surface or securely mounted. Otherwise, injury may result.
Electrical shock hazard. Do not disassemble the warming unit unless you are a qualified
service technician. ere are electrically live parts within the unit when it is connected
to a power source, even when the unit is in OFF or Standby mode.
Notices
e Bair Paws warming unit meets the international electronic interference
requirements. If radio frequency interference with monitoring equipment occurs,
connect the warming unit to a different power source.
Federal law (USA) restricts this device to sale by or on the order of a licensed healthcare
professional.
To reliably ground this warming unit, only connect to receptacles marked “Hospital
Only” or “Hospital Grade.”
Proper Use and Maintenance
Arizant Healthcare Inc. assumes no responsibility for the reliability, performance, or safety of
the unit if any of the following events occur:
Modifications or repairs are performed by unqualified personnel.
e warming unit is used in a manner other than that described in the Operator’s
Manual or Service Manual.
e warming unit is installed in an environment that does not meet the appropriate
electrical and grounding requirements.
Read Before Servicing Unit
All repair, calibration, and servicing of the Model 875 warming unit must be performed by
qualified, medical equipment service technicians who are familiar with good practice for
medical device repair. If the warming unit does not require the manufacturer’s attention,
Arizant Healthcare Inc. will ship replacement parts to your location. Perform all repairs and
maintenance in accordance with the instructions provided with the replacement parts.
Safety Inspection
Perform a safety inspection after making repairs to the Model 875 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 the Service
Procedures section as well as testing for leakage current and continuity check on safety
ground.
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2.
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3.
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Bair Paws® Model 875 Warming Unit Service Manual
4
Preparing the Bair Paws Model
875 Warming Unit for Use
Before using the warming unit, make sure that it is safely placed on a flat, hard surface such
as a table, or securely mounted on a wall, IV pole, or bedrail.
C: Do not place the warming unit on a soft or uneven surface, such as a bed; this
may cause the air intake to become blocked, compromising the unit’s performance.
A wall-mount bracket is shipped with every warming unit; the brackets for mounting the
warming unit to an IV pole or a bedrail are available separately. Please contact your local
sales representative or call Arizant Healthcare® Customer Service at 1-800-733-7775 for more
information about ordering mounting brackets.
Installing the Wall-mount Bracket
Using the four wall-screw holes on the wall-mount bracket (see Figure 1) as a template,
mark the position for the four wall anchors on the desired wall. e use of a level is
recommended.
Install four suitable wall anchors at the marked positions. If using the provided self-
drilling wall anchors, use a Phillips screwdriver to screw the anchors into position. If
installing into industrial-grade plasterboard, predrilling may be required.
Hold the wall-mount bracket in position against the wall.
Screw the four provided screws through the wall-mount holes and into the wall anchors.
1.
2.
3.
4.
Figure 1. Front view of wall-mount bracket.
Wall screws

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Placing the Warming Unit on the Wall-mount Bracket
Snap the warming unit into position by sliding the clip on the back of the warming unit
into the groove of the wall-mount bracket. e assembly will click when the clip is fully
seated in the wall-mount bracket.
Lift the warming unit straight up to remove it from the wall-mount bracket.
N: It may be necessary to gently strike the case bottom in an upward fashion with
the palm of your hand to release the clip from the wall-mount bracket.
1.
2.
Figure 2. Inserting the warming unit into the groove of the wall-mount bracket.
Wall-mount
bracket
Case bottom

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Mounting the Warming Unit on an IV Pole
C: To prevent tipping, mount the Model 875 warming unit on an IV pole at a height
that ensures stability. We recommend mounting the warming unit no higher than 44 in.
(112 cm) from the floor on an IV pole with a minimum wheelbase radius of 14 in. (35.6 cm).
Failure to do so may result in IV pole tipping, leading to potential catheter site trauma and
other patient injuries.
Position the IV pole-mount at the desired height on the IV pole.
Turn the clamp knob on the IV pole-mount clockwise to tighten the clamp to the pole
(Figure 3).
Snap the warming unit into position by sliding the clip on the back of the warming
unit into the groove of the IV pole-mount. e assembly will click when the clip is fully
seated in the IV pole-mount.
1.
2.
3.
Figure 3. Installing a warming unit onto an IV pole.
Clamp knob
IV pole
IV pole-mount
Clip

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Mounting the Warming Unit on a Bedrail
Slide the clip on the back of the warming unit into the groove of the rail-mount bracket.
e assembly will click when the clip is fully seated in the rail-mount.
Hang the Model 875 warming unit on the bedrail by the hooks on the rail-mount.
Wrap the safety strap around the bedrail and connect the end to the fastener on
the strap. e safety strap will prevent the warming unit from falling if the unit is
accidentally dislodged from the bedrail.
1.
2.
3.
Figure 4. Mounting the warming unit on a bedrail using the rail-mount.
Safety strap
Bedrail
Rail-mount

Bair Paws® Model 875 Warming Unit Service Manual
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Mounting the Warming Unit with a Rail-mount to the Wall
P: e rail-to-wall bracket is intended for use only with a Bair Paws 800 series
warming unit.
N: A minimum of two wall anchors must be used to secure the rail-to-wall bracket to the
wall. Additional wall anchors (up to a total of four) can be used for extra support.
Using the wall-screw holes on the rail-to-wall bracket (see Figure 5) as a template,
mark the position for the two wall anchors on the desired wall. e use of a level is
recommended.
Install two suitable wall anchors at the marked position. If using the provided self-
drilling wall anchors, use a Phillips screwdriver to screw the anchors into position. If
installing into industrial-grade plasterboard, predrilling may be required.
Hold the rail-to-wall bracket in position against the wall.
Screw the two provided screws through the bracket holes and into the wall anchors.
If the warming unit is not already connected to the rail-mount, slide the clip on the
back of the warming unit into the groove of the rail-mount. e assembly will click
when the clip is fully seated in the rail-mount.
Hook the warming unit with the attached rail-mount to the rail-to-wall bracket as
depicted in Figure 5.
Lift the warming unit straight up to remove it from the rail-to-wall bracket.
1.
2.
3.
4.
5.
6.
7.
Figure 5. Placing the warming unit with a rail-mount onto the rail-to-wall bracket.
Rail-to-wall
bracket
Rail-mount

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Using the Hand-held Temperature Controller
After the hose has been connected to the Bair Paws gown, the patient can adjust the air
temperature and airflow by turning the knob on the temperature controller. e following
list explains how the unit will operate when the knob is placed in the specified position
shown in the figure.
When the knob is in position A, the warming unit is .
As the knob is rotated from position A to B, the knob clicks and the warming unit
turns on   and  .
By turning the knob from position B to C, the air temperature increases from slightly
above room temperature to approximately 41˚C (106˚F), while the blower remains on
 .
As the knob rotates clockwise past
position C, the blower’s airflow
increases.
At position D, the warming unit is on
  and  . e air
temperature will stabilize at 43±3˚C
(109±5.4˚F).
Using the Holder for the Hand-held Temperature Controller
Store the hand-held temperature controller in the controller holder to help prevent cord
clutter around the patient and accidental damage to the warming unit.
Press the holder onto the warming unit hose so it is
within the patient’s reach (see Figure 7).
Slide the temperature controller into the holder. It
should fit securely with the dial facing the patient
(see Figure 8).
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1.
2.
Warming
unit hose
Temperature
controller
holder
Figure 7. Controller holder.
Temperature
controller
Figure 8. Temperature
controller seated in holder.
Figure 6: Important knob positions
for the temperature controller.

Bair Paws® Model 875 Warming Unit Service Manual
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Service Procedures
Calibrating the Operating Temperatures
Service Frequency
Always recalibrate after performing service procedures.
Routinely calibrate every 6 months.
Tools/Equipment Needed
Model 90055 Temperature Test Kit (thermocouple included)
2-mm flat-headed screwdriver
Medium Phillips screwdriver
Calibrated thermometer
Warnings
e Model 875 hand-held temperature controller must be at its maximum (warmest)
setting when calibrating; otherwise, temperature settings may be inaccurate and
patient injury could result.
Do not calibrate the Model 875 warming unit above 43°C; patient injury may result.
Precautions
Perform all calibrations of the Model 875 warming unit using an Arizant Healthcare
Model 90055 Temperature Test Kit.
Perform calibration testing at an ambient temperature similar to the area where the
Model 875 warming unit will be used.
e Model 875 warming unit is intended for use in an ambient environment between
18 and 26°C (65 and 79°F).
Notes
e Model 90055 Temperature Test Kit simulates the operating characteristics of Bair Paws
gown when used with the Bair Paws Patient Adjustable Warming System.
When using the Model 90055 Test Kit, take temperature readings using a calibrated
thermometer that can accept a male, subminiature connector and read a “K” type
thermocouple (e.g., a Fluke Model 52 K/J ermometer). 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.
Arizant Healthcare Inc. assumes no responsibility for the reliability, safety, or performance
of the Model 875 warming unit if calibration tests or adjustments are made in any
manner other than those described here. Improper measurement or adjustment of the
normal operating temperature for the Model 875 unit could result in patient exposure to
temperatures outside of the indicated range and may lead to patient injury.
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Method
Turn the warming unit  and select the maximum airflow and temperature by turning
the temperature controller completely clockwise (refer to position D in Figure 6).
Press the clip buttons on the hose end and insert the hose end into the temperature
test kit.
Allow the system to warm 10 minutes before starting the calibration.
Extend the hose straight to its full length. Remove the two screws that attach the case
bottom (dark purple) to the warming unit and slide it down the hose.
Ensure the thermocouple is inserted through the grommet of the cylindrical test kit
body. e thermocouple tip should be approximately centered in the cross section of the
test kit (see Figure 9).
1.
2.
3.
4.
5.
Figure 9. Test kit used to calibrate the Model 875 warming unit.
Grommet
Figure 9. Test kit used to calibrate the Model 875 warming unit.
Grommet

Bair Paws® Model 875 Warming Unit Service Manual
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Insert a flat-headed, 2-mm screwdriver into the calibration access hole to a depth of
approximately 1/2 inch (see Figure 10). Turn the pot very slowly until the steady state
temperature reading is 43°C. Wait at least 5 minutes to ensure steady state (43.0±0.5°C).
Proceed to the next section to test the Over-temperature (OT) circuit.
6.
7.
Figure 10. Calibration access hole to adjust pot.Figure 10. Calibration access hole to adjust pot.

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Arizant Healthcare Inc.
Testing the Over-temperature (OT) Circuit
Service Frequency
Test every 6 months.
Tools/Equipment Needed
Model 90055 Temperature Test Kit (thermocouple included)
Small screwdriver
Medium Phillips screwdriver
Calibrated thermometer
Precautions
Perform all over-temperature circuit testing of the Model 875 warming unit using an
Arizant Healthcare Model 90055 Temperature Test Kit.
Perform all over-temperature circuit testing at an ambient temperature similar to the
area where the Model 875 warming unit will be used.
e Model 875 warming unit is intended for use in an ambient environment between
18 and 26°C (65 and 79°F).
Method
N: e OT threshold temperature cannot be adjusted. If problems occur, contact Arizant
Healthcare customer service.
If continuing from Calibrating the Operating Temperatures, skip to step 6; otherwise,
proceed to the next step.
Turn the warming unit  and select the maximum airflow and temperature setting by
turning the controller knob completely clockwise (refer to position D in Figure 6).
Press the clip buttons on the hose end and insert the hose end into the temperature test
kit.
Allow the system to warm 10 minutes before starting the test.
Extend the hose straight to its full length. If not already done, remove the two screws
that attach the case bottom (dark purple) to the warming unit and slide it down the
hose.
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2.
3.
4.
5.

Bair Paws® Model 875 Warming Unit Service Manual
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With a small screwdriver continuously press the OT
test button (see Figure 11) for the duration of the
over-temperature test.* When functioning properly, the
“Over-Temp” indicator will illuminate and an audible
alarm will sound. e peak test kit temperature will
be below 56°C, and the heater will switch off within
two minutes. If this does not occur, return the unit to
Arizant Healthcare Inc. for service.
*Pressing the OT test button places the heater in a full-on, unregulated condition;
therefore, the unit may become slightly warm to the touch.
Turn the temperature controller to the  position to
reset the alarm
(position A, Figure 6). Wait ten seconds.
Turn the temperature controller to position B (Figure 6). After waiting several minutes,
the thermocouple temperature should approach the ambient temperature.
Reposition the case bottom with the filter and attach to the warming unit with two
screws.
Replacing the Filter
Service Frequency
Inspect the warming unit filter every three months and replace at least every six months.
Tools/Equipment Needed
Medium Phillips screwdriver
Replacement filters (available from Arizant Healthcare Customer Service)
Method
Disconnect the warming unit from the power source.
Remove the two screws that attach the case bottom (dark purple) to the warming unit.
Slide the case bottom down the hose, remove the used filter, and replace with a new
filter.
Reposition the case bottom (with the new filter) and attach to the warming unit with
the two screws.
Reconnect the warming unit to the power source and turn the temperature controller
 to make sure the warming unit functions properly before returning to service.
N: Verify calibration and test the OT circuit if it has been longer than six months since it
was last serviced.
6.
7.
8.
9.
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2.
3.
4.
5.
Figure 11.
OT test button hole
Figure 11.
OT test button hole

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Replacing the Temperature Controller and/or Hose
Tools/Equipment Needed
Small Phillips screwdriver
Medium Phillips screwdriver
Method
Disconnect the warming unit from the power source.
Remove the two screws that attach the case bottom (dark purple) to the warming unit,
and slide the case bottom down the hose.
Remove the three screws on the back of the warming unit that hold the enclosures
together (see Figure 12).
Flip the unit over and remove the cover. is will expose the control board.
Gently pull the end-of-hose coupler out of the warming unit by a few inches to expose
the controller wire.
Disconnect the controller wire from the control board. You will have to depress the tab
on the controller wire plug to free it from its port on the control board.
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1.
2.
3.
4.
5.
6.
Figure 12. Removing the enclosure screws.
Back of
warming unit
Case bottom
End-of-hose
coupler
Figure 13. Pull the end-of-hose coupler out of the warming unit.

Bair Paws® Model 875 Warming Unit Service Manual
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To replace the hose or controller remove the two screws that connect the wire collar to
the mid-hose coupler and pull the wire out through the dedicated hole (see Figure 14).
N: If you are replacing both the hose and controller do not remove the wire collar
from the hose. Proceed to Step 8.
Using either a replacement temperature controller assembly and/or a replacement hose,
thread the controller wire through the dedicated hole. Hold the hose vertical and let the
wire plug drop through to the end-of-hose coupler.
Secure the wire collar to the mid-hose coupler with two screws.
If replacing the hose, transfer the case bottom onto the new hose.
Plug the controller wire into the port on the control board.
7.
8.
9.
10.
11.
Mid-hose
coupler
Wire collar
Figure 14. Removing the existing controller wire from the hose.
Mid-hose
coupler
Wire collar
Figure 14. Removing the existing controller wire from the hose.

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Making sure that the controller wire passes through the clearance slot, insert the end-of-
hose coupler into the warming unit (see Figure 15).
N: Ensure the end-of-hose coupler ridge is seated under the control board.
Replace the cover.
Install the three screws on the back of the unit.
Reposition the case bottom with the filter and attach to the warming unit with two screws.
Plug the unit into a proper power source.
Calibrate unit and test OT circuit.
12.
13.
14.
15.
16.
17.
Figure 15. Inserting the end-of-hose coupler into the warming unit.
Clearance
slot
Controller
wire
Ridge of end-of-hose coupler
End-of-hose
coupler
Figure 15. Inserting the end-of-hose coupler into the warming unit.
Clearance
slot
Controller
wire
Ridge of end-of-hose coupler
End-of-hose
coupler

Bair Paws® Model 875 Warming Unit Service Manual
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Replacing the Power Cord
Tools/Equipment Needed
Medium Phillips screwdriver
Method
Disconnect the warming unit from the power
source.
Loosen the two screws that secure the cord retainer
to the warming unit. e screws should be backed
out by 1/8” to allow the removal of the cord
retainer (Figure 16).
N: Do not back the cord retainer screws out
completely.
Rotate the cord retainer to free it from the screw
heads and slide it off of the cord (Figure 17).
Pull the plug of the old cord out of the unit.
Dispose of the old cord.
Insert the plug of the new cord into the unit.
Position the cord retainer onto the new cord.
Secure the cord retainer to the warming unit
with the two screws.
Reconnect the warming unit to the power
source and turn the temperature controller
 to make sure the warming unit functions
properly before returning to service.
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1.
2.
3.
4.
5.
6.
7.
8.
Figure 17.
Uninstalling
the cord retainer.
Figure 17.
Uninstalling
the cord retainer.
Figure 16.
View of a fully
installed cord
retainer.