Nellcor WT-5800 User manual
Model WT-5800 Patient Warming System
Service Manual
© 2011 Nellcor Puritan Bennett LLC. All rights reserved.
To obtain warranty information contact your local Nellcor representative.
Table of Contents
Safety Information.................................................................................................... 9
Overview ................................................................................................................ 9
Warnings ................................................................................................................ 9
Cautions................................................................................................................ 11
Introduction............................................................................................................. 13
Overview .............................................................................................................. 13
Intended Use ........................................................................................................ 13
Manual Availability.............................................................................................. 13
Background Information..................................................................................... 13
Safety Features..................................................................................................... 14
Customized Warming Therapy ..................................................................... 14
Automatic Temperature Stepdown.............................................................. 14
Automatic Over Temperature Shutdown .................................................... 14
Alarms ............................................................................................................ 15
HEPA Filter ..................................................................................................... 16
Wheel Locks ................................................................................................... 16
Symbols................................................................................................................. 17
Description of the Warming System................................................................... 17
Routine Maintenance ............................................................................................. 21
Overview .............................................................................................................. 21
HEPA Filter Replacement..................................................................................... 21
Power Cord Replacement.................................................................................... 24
Nozzle Replacement ............................................................................................ 25
Cleaning the Warming Unit ................................................................................ 26
Performance Verification........................................................................................ 27
Overview .............................................................................................................. 27
Power Fail / Start Alarm Check............................................................................ 27
Thermostat Protection Check.............................................................................. 28
Output Temperature Check ................................................................................ 31
Safety Tests........................................................................................................... 33
Repair....................................................................................................................... 35
Overview .............................................................................................................. 35
Filter Cover Assembly Replacement ................................................................... 36
Separating the Front and Rear Covers................................................................ 38
Rejoining the Front and Rear Covers.................................................................. 40
Front Cover Assembly Replacement ................................................................... 41
Control PCBA Replacement................................................................................. 49
Heater Assembly Replacement............................................................................ 53
Hose Replacement ............................................................................................... 64
Duct Adapter Assembly Replacement ................................................................ 66
Rear Cover Assembly Replacement..................................................................... 71
Service Manual iii
Spare Parts & Accessories....................................................................................... 87
Overview .............................................................................................................. 87
Ordering Information.......................................................................................... 87
Replacement Parts and Accessories .................................................................... 90
Manual Availability.............................................................................................. 90
Packing for Shipment ............................................................................................. 91
Overview .............................................................................................................. 91
Returning the Warming Unit .............................................................................. 91
Repacking in Original Carton.............................................................................. 91
Repacking in a Different Carton......................................................................... 93
Specifications .......................................................................................................... 95
Overview .............................................................................................................. 95
Warming System Specifications .......................................................................... 95
Transport and Shipping in Shipping Container ................................................. 96
Compliance........................................................................................................... 96
Manufacturer’s Declaration ................................................................................ 96
Electromagnetic Compatibility (EMC)................................................................. 97
Electromagnetic Emissions ............................................................................ 97
Electromagnetic Immunity............................................................................ 97
Ground Integrity Test .......................................................................................... 99
Earth Leakage Current Test............................................................................... 100
Enclosure Leakage Current Test........................................................................ 100
Principles of Operation......................................................................................... 101
Overview ............................................................................................................ 101
Control Panel ..................................................................................................... 101
Main Circuit Board............................................................................................. 102
DC Power Supply Circuit.............................................................................. 102
Control Logic Circuit.................................................................................... 103
Automatic Temperature Stepdown............................................................ 103
Alarm Drive Circuits..................................................................................... 103
Temperature Control Circuit....................................................................... 104
LCD Hour Meter........................................................................................... 105
AC Power Section ........................................................................................ 105
Blower .......................................................................................................... 106
Heater........................................................................................................... 106
Thermostat Protection ................................................................................ 106
Over-Temperature Test Port ....................................................................... 106
iv Service Manual
List of Figures
Figure 1: Cart Wheel Lock........................................................................................... 16
Figure 2: Front View.................................................................................................... 18
Figure 3: Back View.................................................................................................... 19
Figure 4: Operating Hours Meter............................................................................... 22
Figure 5: Filter Cover Screws....................................................................................... 22
Figure 6: HEPA Filter and Power Cord Strain Relief.................................................. 23
Figure 7: Power Cord Routing .................................................................................... 24
Figure 8: Over-Temperature Test Port ....................................................................... 29
Figure 9: WT-5800 High Temperature Setting .......................................................... 29
Figure 10: Warning Light............................................................................................ 30
Figure 11: Output Temperature Test Setup............................................................... 32
Figure 12: Temperature Selection .............................................................................. 32
Figure 13: Ground Stud............................................................................................... 33
Figure 14: Power Cord ................................................................................................ 37
Figure 15: Filter Cover Screws..................................................................................... 37
Figure 16: Power Cord ................................................................................................ 38
Figure 17: Cover Screw Locations............................................................................... 39
Figure 18: Separated Covers ....................................................................................... 39
Figure 19: Cover Screw Locations............................................................................... 40
Figure 20: Cable Harness Bundle Ties ........................................................................ 42
Figure 21: Front Cover Assembly................................................................................ 42
Figure 22: Power Switch Clips and Wires................................................................... 43
Figure 23: Cable Disconnect ....................................................................................... 43
Figure 24: Control PCB Screws.................................................................................... 44
Figure 25: Control PCB Lights ..................................................................................... 45
Figure 26: Control PCB Screws.................................................................................... 45
Figure 27: Cable Connections ..................................................................................... 46
Figure 28: Power Switch Clips and Wires................................................................... 46
Figure 29: Front Cover Assembly Component Locations .......................................... 47
Figure 30: Equipotential Ground Stud Wiring .......................................................... 47
Figure 31: Cable Harness Bundle Ties ........................................................................ 48
Figure 32: Control PCB Connections .......................................................................... 49
Figure 33: Control PCB Screws.................................................................................... 50
Figure 34: Control PCB Lights ..................................................................................... 50
Figure 35: Control PCB Screws.................................................................................... 51
Figure 36: Cable Connections ..................................................................................... 51
Figure 37: Cable Harness Bundle Ties ........................................................................ 52
Figure 38: Filter Removal ............................................................................................ 53
Figure 39: Blower Assembly Screws ........................................................................... 54
Figure 40: Cable Harness Bundle Ties ........................................................................ 54
Figure 41: Front Cover Assembly................................................................................ 55
Figure 42: Duct Adapter Placement ........................................................................... 56
Figure 43: Blower Motor Removal ............................................................................. 57
Figure 44: Blower Assembly Clips............................................................................... 57
Figure 45: Rubber Gasket ........................................................................................... 58
Service Manual v
Figure 46: Heater Assembly ........................................................................................ 58
Figure 47: Heater Assembly Installation .................................................................... 59
Figure 48: Rubber Gasket ........................................................................................... 60
Figure 49: Blower Assembly Clips............................................................................... 60
Figure 50: Duct Adapter Placement ........................................................................... 61
Figure 51: Blower Assembly Screws ........................................................................... 62
Figure 52: Cable Harness Bundle Ties ........................................................................ 62
Figure 53: Filter Installation........................................................................................ 63
Figure 54: Filter Cover Installation ............................................................................. 63
Figure 55: Hose Attachment....................................................................................... 65
Figure 56: Thermistor Silicone .................................................................................... 67
Figure 57: Thermistor Removal .................................................................................. 67
Figure 58: Duct Adapter Removal .............................................................................. 68
Figure 59: Duct Adapter Placement ........................................................................... 69
Figure 60: Thermistor Position Within Duct Adapter ............................................... 69
Figure 61: Filter Cover Screws..................................................................................... 72
Figure 62: Filter Removal ............................................................................................ 72
Figure 63: Separated Covers ....................................................................................... 73
Figure 64: Front Cover Assembly................................................................................ 74
Figure 65: Cable Disconnect ....................................................................................... 75
Figure 66: Thermistor Cable Removal ........................................................................ 75
Figure 67: Blower Assembly Screws ........................................................................... 76
Figure 68: Blower Capacitor ....................................................................................... 76
Figure 69: Blower Motor Removal ............................................................................. 77
Figure 70: Blower Assembly Clips............................................................................... 77
Figure 71: Rubber Gasket ........................................................................................... 78
Figure 72: Heater Assembly ........................................................................................ 78
Figure 73: Heater Assembly Installation .................................................................... 79
Figure 74: Rubber Gasket ........................................................................................... 80
Figure 75: Blower Installation .................................................................................... 80
Figure 76: Blower Screws ............................................................................................ 81
Figure 77: Thermistor Cable Installation.................................................................... 81
Figure 78: Capacitor Installation ................................................................................ 82
Figure 79: Cable Connections ..................................................................................... 82
Figure 80: Front Cover Assembly................................................................................ 83
Figure 81: Equipotential Ground Stud Wiring .......................................................... 84
Figure 82: Cable Harness Bundle Ties ........................................................................ 84
Figure 83: Filter Installation........................................................................................ 85
Figure 84: Filter Cover Installation ............................................................................. 85
Figure 85: Spare Parts (Sheet 1).................................................................................. 89
Figure 86: Spare Parts (Sheet 2).................................................................................. 90
Figure 87: Packing the Warming Unit in Original Carton ........................................ 92
Figure 88: Control Panel ........................................................................................... 101
Figure 89: Hour Meter .............................................................................................. 105
Figure 90: Warming Unit Schematic (Sheet 1)......................................................... 107
Figure 91: Warming Unit Schematic (Sheet 2)......................................................... 108
vi Service Manual
List of Tables
Table 1: Symbols on the Warming System................................................................. 17
Table 2: Equipment Required for HEPA Filter Replacement .................................... 21
Table 3: Equipment Required for Thermostat Protection Check ............................. 28
Table 4: Equipment Required for Output Temperature Check................................ 31
Table 5: Filter Cover Assembly Components ............................................................. 36
Table 6: Tools Required for Replacing FIlter Cover Assembly .................................. 36
Table 7: Tools Required for Separating Front and Rear Covers ............................... 38
Table 8: Filter Cover Assembly Components ............................................................. 41
Table 9: Tools Required for Replacing Front Cover Assembly.................................. 41
Table 10: Tools Required for Replacing Control PCB ................................................ 49
Table 11: Heater Assembly Components ................................................................... 53
Table 12: Tools Required for Replacing Heater Assembly ........................................ 53
Table 13: Hose Assembly Components ...................................................................... 64
Table 14: Tools Required for Replacing Hose Assembly ........................................... 64
Table 15: Duct Adapter Assembly Components ........................................................ 66
Table 16: Tools Required for Replacing Duct Adapter Assembly............................. 66
Table 17: Rear Cover Assembly Components ............................................................ 71
Table 18: Tools Required for Replacing Rear Cover Assembly ................................. 71
Table 19: Spare Parts and Accessories........................................................................ 88
Table 20: System Specifications .................................................................................. 95
Table 21: Shipping Container Specifications ............................................................. 96
Table 22: Compliance Standards ................................................................................ 96
Table 23: Electromagnetic Emissions Guidelines....................................................... 97
Table 24: Electromagnetic Immunity Guidelines....................................................... 97
Table 25: Recommended Separation Distances......................................................... 99
Table 26: Earth Leakage Current Test...................................................................... 100
Table 27: Enclosure Leakage Current Test............................................................... 100
Service Manual vii
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viii Service Manual
1 Safety Information
Overview
This chapter contains safety information requiring users to exercise
appropriate caution when servicing the WarmTouch™ Model WT-5800
patient warming system.
The WARNING symbol identifies warnings.
Overview
Warnings alert the user to potential serious outcomes, such as death, injury,
or adverse events to the patient or user.
The CAUTION symbol identifies cautions.
Cautions alert the user to exercise care necessary for the safe and effective
use of the warming system.
The NOTE symbol identifies notes.
Notes contain important information that may otherwise be overlooked or
missed.
Warnings
WARNING
Possible explosion hazard. Do not use the device in the presence of
flammable anesthetics.
Service Manual 9
Safety Information
WARNING
Possible electrical shock hazard. To reduce the risk of electrical shock do not
remove the back case. Servicing is only to be done by qualified personnel.
WARNING
Possible electric shock hazard. Grounding reliability can be achieved only
when the warming system is connected to a suitable mains outlet.
WARNING
Possible fire hazard. Prevent the blanket material from coming into contact
with a laser or an electrosurgical active electrode; rapid combustion could
result.
WARNING
Possible burn hazard. Do not apply heat directly to open wounds. All
patient’s wounds should be covered while using the warming system.
WARNING
Possible patient burns. Use caution and consider discontinuing use on
patients during vascular surgery when an artery to an extremity is clamped.
Do not apply the warming system to ischemic limbs.
WARNING
Possible patient burns. Use caution and monitor closely if used on patients
with severe peripheral vascular disease.
WARNING
If a malfunction occurs in the warming system, discontinue use. Notify your
sales/service center of the malfunction. The unit must be serviced by an
authorized service technician.
WARNING
TM
No free-hosing. Keep hose nozzle connected to a WarmTouch
blanket at
all times or thermal injury may occur.
WARNING
TM
WarmTouch CareDrape
and CareQuiltTM blankets are for single patient use
only.
10 Service Manual
WARNING
The warming system should not be operated in the presence of
electromagnetic fields that are greater than 3 volts/meter. This could cause
shutdown of the warming system by the fail-safe function within the
equipment.
WARNING
The warming system is not suitable for use during magnetic resonance
imaging (MRI) scanning. The warming system may affect the MRI image.
WARNING
Continuously monitor the patient's temperature. Reduce the air temperature
or discontinue therapy when normothermia is reached.
WARNING
The patient must be closely monitored for rewarming. Vasodilation and
potential hypotension can occur. Use good judgment when selecting a
temperature. If unsure of proper setting, consult with the attending
physician.
Cautions
WARNING
The use of accessories and power cables other than those specified may
result in increased emission and/or decreased immunity of the warming
system.
WARNING
Thermal injury may result if the warming system hose comes into contact
with the patient.
WARNING
Using the warming system on transdermal medication patches may increase
the rate of drug delivery, potentially causing harm to the patient.
WARNING
Before attempting to open or disassemble the warming system, disconnect
the power cord from the AC power source.
Cautions
Caution
Federal (U.S.A.) law restricts the use of the warming system to sale by or on the order
of a physician.
Service Manual 11
Safety Information
Caution
The warming system is fitted with an air filter; however, airborne contamination
should be considered when using the warming system.
Caution
If the warming system is mounted on the intravenous (IV) pole, it should be installed
with the top of the unit’s handle less than 76 cm (30 inches) above the floor to
prevent the IV pole from tipping over.
Caution
The institution should follow local governing ordinances and recycling instructions
regarding disposal or recycling of filter and device components or end of life of the
product.
Caution
The HEPA filter must be changed every 2,000 hours of operation. Refer to the
Routine Maintenance section for replacement procedures requiring a qualified
technician.
Caution
Do not spray, pour, or spill any liquid on the warming unit, its accessories,
connectors, switches or openings in the case.
Caution
Observe ESD (electrostatic discharge) precautions when working within the warming
system.
Caution
Repairs to the warming system should only be accomplished by trained service
technicians.
Caution
Ensure that the patient is dry or the warming system may be ineffective.
12 Service Manual
1 Introduction
Overview
This chapter provides an introduction to the WarmTouch™ Model WT-5800
patient warming system.
Intended Use
The WarmTouch™ Model WT-5800 patient warming system (warming unit
and blanket) is intended for prevention and treatment of hypothermia, for
example, with the surgical patient, the patient in the pre-operative holding
area, the pregnant woman who shivers during epidural anesthesia due to
hypothermia, or any patient who is uncomfortable anywhere in the cold
critical care environment.
Overview
Manual Availability
The most recent revision of this manual is available on the Internet at:
http://www.nellcor.com/serv/manuals.aspx
Background Information
There are numerous ways of warming your patient, from cotton blankets to
water mattresses. Research has shown that low temperatures surrounding the
patient are a major factor contributing to hypothermia.
system covers the patient with warm air and actively transfers heat across the
skin. The result is to achieve normothermia.
1
Morris RH, Wilkey BR. “The Effects of the Ambient Temperature on Patient Temperature
During Surgery Not Involving Body Cavities.” Anesthesiology 32:102
2
Morris RH. “Influence of Ambient Temperature on Patient Temperature During
Intra
-abdominal Surgery.” Annals of Surgery 173:230-233, 1971.
1,2
The warming
-107, 1970.
Service Manual 13
Introduction
In creating this warm customized pocket of air around the hypothermic
patient, it is important to note that stagnant air, even if it is warm, does not
work as an effective heat transfer medium. Stagnant air acts as an insulator,
preventing the boundary layer of molecules next to the skin surface from
transferring heat.
Forced air warming causes warmed air molecules to flow over cooler skin
surface. It is this active flow of warmed molecules that acts as a heat transfer
medium. With the warming system, air is warmed and delivered into a
lightweight blanket (CareQuilt or CareDrape blanket) that rests over or under
the patient. The CareQuilt and CareDrape blankets have many small
perforations on the underside that allow air to exit the blanket and surround
the patient.
Safety Features
The warming system is designed to give healthcare professionals more control
over the patient’s core body temperature. There are several safety features of
the warming system which make it safe and appropriate for such use.
Customized Warming Therapy
Clinicians select temperature range setting at the onset of warming therapy
to help ensure the appropriate setting is selected for every patient.
Automatic Temperature Stepdown
The warming system provides a 45-minute temperature stepdown feature.
When in High temperature mode, blower temperature will automatically drop
to the Medium temperature setting after each 45 minutes of use. The
temperature may be reset to High at any time by selecting the High
temperature setting on the control panel to start another 45-minute cycle.
Automatic Over Temperature Shutdown
The automatic temperature controller and two back-up systems help to
ensure temperature will not reach excessive levels. If necessary, the control
system automatically turns off the heater element when the blower outlet
temperature rises to between 47º C and 50º C, illuminates the warning light,
14 Service Manual
and sounds an audible alarm. The warming system heater will start producing
heat when the warming system temperature drops to between approximately
34º C and 37º C. A yellow warning light illuminates whenever the control
system identifies an over-temperature condition.
Alarms
The WarmTouch control circuit manages and monitors operation of the
patient warming system. Should the control circuit encounter a failure
condition, it reports failures using both visual and audible alarms. The visual
alarm is a yellow warning indicator on the control panel that lights at power
on, upon power restoration following power failure, and whenever the
control system identifies an alarm condition. The audible alarm sounds
intermittently or continuously, depending on the alarm condition. Investigate
immediately.
Safety Features
The WarmTouch control circuit recognizes two failure conditions.
1. Power On/Power Fail Alarm — This condition causes an intermittent
audible alarm and continuous visual alarm. It appears at power on and
after power failure, indicating the operator must select the desired
temperature. Upon selection of a temperature key, the system cancels the
alarm and the blower operates at the desired temperature.
2. Over-temperature Alarm — This condition causes a continuous audible
alarm and a flashing visual alarm. It appears when reaching the
temperature safety limit, and the control system turns off the heater. Once
the system air temperature returns to a safe operating temperature of
between 34ºC and 37ºC, the heater will turn back on.
If the control system determines the heater again exceeds the safety limit,
the warming system alarms once more. Take the warming system out of
service for repair by a qualified service technician.
If a power failure occurs while the warming system is in the overtemperature fault condition, and the warming system is still in the overtemperature fault condition when power is restored, both continuous
audible and visual alarms will activate. In this instance, the overtemperature fault cannot be cleared. Take the warming system out of
service for repair by a qualified service technician.
Note:
The Power Fail/Start Alarm is only found on WT-5800 warming units containing a
Control PCBA with part number GR100305.
Service Manual 15
Introduction
HEPA Filter
Caution
The HEPA filter must be changed every 2,000 hours of operation. Refer to the
Routine Maintenance section for replacement procedures requiring a qualified
technician.
The system's High Efficiency Particulate Air Filter is 99.97% efficient at
0.3-micron particle size.
Wheel Locks
The cart is equipped with two wheel locks. The wheel locks prevent the cart
from moving while in use. The wheel locks must be released when moving
the cart. Press the wheel lock arm down to lock the wheel. Lift the wheel lock
arm to release the wheel lock. See Figure 1.
Figure 1. Cart Wheel Lock
16 Service Manual
Symbols
The symbols identified in Table 1 are the symbols used on the warming unit.
Table 1. Symbols on the Warming System
Symbols
Attention symbol, consult accompanying documentation
Do not direct air from the hose to the patient (free-hosing); use hose only
with warming blankets.
Dangerous voltage
Protection Class I
Protection Type BF
Date of manufacture
Visual and audible alert
.
Description of the Warming System
The warming unit (Figure 2 and Figure 3) and CareQuiltTMand CareDrape
blankets are intended for prevention and treatment of hypothermia. For
example, use the warming system with the surgical patient, the patient in the
preoperative holding area, the pregnant woman who shivers during epidural
anesthesia due to hypothermia, or any patient who is uncomfortable
anywhere in the cold critical care environment.
Service Manual 17
TM
Introduction
1 Power Cord 4 Hose
2 Hours Meter 5 Power Switch
3 Control Panel 6 Nozzle
Figure 2. Front View
18 Service Manual
Description of the Warming System
1 Over-Temperature Test Port 5 Filter Cover
2 Instruction Label 6 Bed Hook Bracket
3 Blower Cart Clamp 7 Nozzle Strap with Clip
4 Warning Label
Figure 3. Back View
Service Manual 19
Introduction
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20 Service Manual
1 Routine Maintenance
Overview
This chapter provides routine maintenance procedures for the WarmTouch™
Model WT-5800 patient warming system.
Caution
The institution should follow local governing ordinances and recycling instructions
regarding disposal or recycling of filter and device components or end of life of the
product.
Overview
HEPA Filter Replacement
The warming system filter must be replaced after every 2,000 hours of use.
Contact Nellcor’s Customer Service Department (1.800.635.5267, press 3 in
the U.S.A.) or your local Nellcor representative to purchase new filters. The
correct filter will be sent to your hospital for installation.
Caution
Only qualified hospital personnel should replace the air filter.
Table 2. Equipment Required for HEPA Filter Replacement
Equipment Description / Use
Phillips screwdriver #2 / Removing screws
Replacement filter P/N 505-2200
Flat blade screwdriver Detaching power cord from filter cover
WARNING
Do not operate the warming system with the back cover removed.
Note:
To read the operating hours meter, the warming system must be running.
Service Manual 21
Routine Maintenance
To replace the HEPA filter:
1. Write the date and total hours of operation of the warming system on the
new filter label and warming system label. The operating hours meter is on
the front of the warming system (see Figure 4).
Figure 4. Operating Hours Meter
2. Unplug the warming system.
3. Lay the warming unit on its front side so that the bottom of the warming
unit is visible.
4. Unwrap the power cord from the filter cover.
5. Remove the filter cover screws. See Figure 5.
Figure 5. Filter Cover Screws
22 Service Manual
HEPA Filter Replacement
6. Unseat the power cord from the power cord routing bracket on the filter
cover. If necessary, use the head of the flat blade screwdriver to separate
the halves of the bracket sufficiently to allow unseating of the cord.
7. Remove the filter cover.
8. Remove the filter. See Figure 6.
1 HEPA Filter 2 Power Cord Strain Relief
Figure 6. HEPA Filter and Power Cord Strain Relief
9. Place the new filter into the warming unit.
10. Ensure that the power cord’s female connector is still fully inserted into the
socket in the warming unit housing.
11. Place the filter cover on the case and reseat the power cable into the
power cable routing bracket on the bottom of the cover.
12. Align the filter cover with the three screw holes in the filter and install the
three screws holding the filter cover to the warming unit.
13. Attach the completed replacement filter label to the rear surface of the
filter cover. If a replacement filter label is already present, cover it with the
new label.
Service Manual 23
Routine Maintenance
Power Cord Replacement
The warming system is equipped with a detachable power cord. If the power
cord is damaged, contact your local Nellcor representative.
Caution
Only qualified hospital personnel should replace the power cord.
The only equipment required for this procedure is a flat blade screwdriver.
To replace the power cord:
1. Unplug the warming system power cord from the AC outlet.
2. Lay the warming unit on its rear side so that the bottom of the warming
unit is visible.
3. Unwind the power cord from the filter cover.
4.
Unseat the power cord from the power cord routing bracket (Figure 7, item 4)
on the filter cover. If necessary, use the head of the flat blade screwdriver to
separate the halves of the bracket sufficiently to allow unseating of the cord
5. Disconnect the power cord connector (Figure 7, item 2) from its socket in
the blower housing.
1 Equipotential Ground 3 Strain Relief
2 Power Cord Female Connector 4 Power Cord Routing Bracket
.
Figure 7. Power Cord Routing
24 Service Manual
Nozzle Replacement
6. Connect the replacement power cord connector to the warming unit,
making sure the connector is fully inserted into the socket in the warming
unit housing.
7. Reseat the power cord into the power cord routing bracket. If necessary,
use the head of the flat blade screwdriver to separate the halves of the
bracket sufficiently to allow reseating of the cord.
Nozzle Replacement
If the nozzle is damaged, contact your Nellcor representative.
The only equipment required for this procedure is a flat blade screwdriver. The
nozzle is held in place at its base by four clips on the hose assembly; make
sure the screwdriver is long enough to reach inside the nozzle to the clips.
To replace the nozzle:
1. Insert the screwdriver blade into the nozzle, positioning it between one of
the clips and the inner surface of the nozzle.
2. Use the screwdriver blade to push the clip in toward the center of the
nozzle, while simultaneously pulling the nozzle away from the hose until
the clip is disengaged from the base of the nozzle.
3. Repeat steps 1 and 2 to disengage the other three clips.
4. Remove the nozzle from the hose.
5.
Put the replacement nozzle over the end of the hose
6. Push the replacement nozzle down onto the hose until all four clips
engage with the nozzle.
.
Service Manual 25
Routine Maintenance
Cleaning the Warming Unit
Caution
Do not spray, pour, or spill any liquid on the warming unit, its accessories,
connectors, switches, or openings in the case.
For surface-cleaning and disinfecting, follow your institution's procedures or
the recommended actions below.
Surface cleaning — Use a soft cloth dampened with either a commercial,
•
nonabrasive cleaner or a solution of 70% alcohol in water, lightly wiping
the surfaces of the warming unit.
• Disinfection — Use a soft cloth saturated with a solution of 10% chlorine
bleach in tap water, lightly wiping the surfaces of the warming unit.
26 Service Manual
1 Performance Verification
Overview
This chapter provides performance verification procedures to be used when
servicing the WarmTouch™ Model WT-5800 patient warming system.
Power Fail / Start Alarm Check
This procedure ensures the Power Fail / Start Alarm functions correctly and
can be canceled properly. Perform this procedure before returning the
warming system into service.
Overview
Note:
The Power Fail/Start Alarm is only found on WT-5800 warming units containing a
PCBA with part number GR100305. WT-5800 warming units with earlier versions of
the Control PCBA (referred to as the Universal PCBA in earlier versions of this
manual) do not have this alarm, and do not need this test.
At power up, both audible and visual alarms activate, regardless of the reason for
power loss. Selecting any blower temperature cancels both types of alarms.
No equipment is required for this check.
To check the Power Fail / Start Alarm:
1. Plug in the warming system.
2. Turn on the warming system using the power switch. The audible alarm should
sound intermittently, and the warning light should be on steady. The Low
temperature indicator light on the control panel should also be on steady.
3. Select any temperature setting. The audible alarm should stop, and the
warning light should turn off. The indicator light for the selected
temperature should be on steady.
4. Turn off the warming system and unplug it.
Service Manual 27
Performance Verification
Thermostat Protection Check
This procedure checks to ensure that the thermostat protection controls are
working properly. This procedure should be performed before returning the
warming system into service.
Calibration of the thermostat protection is neither required nor possible. If the
test time or temperatures are outside the allowable range, factory service is
required. Contact your local Nellcor representative.
Table3.Equipment Required for Thermostat Protection Check
Equipment Description / Use
Temperature probe Mon-a-Therm subcutaneous temperature probe, or
equivalent, and monitor with an accuracy of ±0.2ºC.
Tape To hold the temperature probe in place.
Stopwatch Manual or electronic
Jumper wire with alligator clips 3 to 12 in (8 to 30 cm) long, alligator clip at each
end, 12 gauge minimum.
Phillips screwdriver #2 / Loosening and tightening test port screw.
WarmTouch CareDrape Lower
Body blanket
To complete patient warming system.
To check thermostat protection:
1. Lay the temperature probe beside the warming unit nozzle at the end of
the hose and bend approximately 1.5 inches (4 cm) of the temperature
probe into the nozzle opening.
2. Position the tip of the temperature probe approximately 1 to 2 in (2.5 to 5
cm)) inside the nozzle, centered in the nozzle opening.
3. Tape the probe in place.
4. Connect the probe to the temperature monitor.
5. Connect the nozzle to the blanket.
6. Unplug the warming system.
7. Loosen the over-temperature test port screw. See Figure 8.
8. Slide the over-temperature test port cover to the side.
28 Service Manual
Thermostat Protection Check
Figure 8. Over-Temperature Test Port
WARNING
Possible patient injury. Connecting the jumper wire disables (shorts out) the
thermistor that is part of the temperature control system.
9. Connect the jumper wire across the two terminals in the over-temperature
test port.
10. Plug in the warming system and turn it on.
11. Select the High (42-46C) temperature setting. See Figure 9.
Figure 9. WT-5800 High Temperature Setting
Service Manual 29
Performance Verification
12. When the monitored temperature exceeds 46ºC, start the stopwatch.
13. When the alarm starts to sound and the warning light indicator lights, stop
the stopwatch. See Figure 10.
Figure 10. Warning Light
14. Time elapsed on the stopwatch should be 5 minutes or less, and the
temperature monitor should not exceed 58ºC.
15. Turn off the warming system and unplug it.
WARNING
Possible patient injury. Connection of the jumper wire disables (shorts out)
the thermistor that is part of the temperature control system. The jumper
wire must be removed.
16. Remove the jumper wire from the over-temperature test port. See Figure 8.
17. Close the over-temperature test port and tighten the screw.
18. Disconnect the warming unit from the blanket.
19. Allow the warming unit to cool for 30 minutes before using it on a patient.
30 Service Manual
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