Service Manual
115 Pages
Preview
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To obtain information about a warranty, if any, contact your local Nellcor representative.
Contents Contents ... i Figures... iii Tables... vi Safety Information ... 1 Warnings ... 1 Cautions ... 2 Introduction... 3 Intended Use ... 3 Manual Availability ... 3 Background Information... 3 Safety Features... 4 Customized Warming Therapy... 4 Automatic Temperature Stepdown ... 4 Automatic Over Temperature Shutdown... 4 Warning Light... 4 HEPA Filter ... 4 Over-Temperature Alarm ... 5 Wheel Locks ... 5 Symbols ... 6 Description of the Warming System... 7 Routine Maintenance... 9 HEPA Filter Replacement ... 9 Hose Replacement ... 11 Power Cord Replacement ... 12 Nozzle Replacement ... 13 Cleaning the Warming System ... 13 Performance Verification ... 15 Thermostat Protection Check... 15 Output Temperature Check... 18 Safety Tests... 20 Disassembly Guide... 21 Filter Cover Assembly Replacement ... 21 Separating the Warming Unit Front and Rear Covers ... 23 Front Cover Assembly Replacement ... 25 Universal PCB Replacement ... 33 Heater Assembly Replacement ... 40 Duct Adapter Assembly Replacement ... 54 Rear Cover Assembly Replacement ... 59 Spare Parts and Accessories ... 79 Ordering Information ... 79 Replacement Parts and Accessories... 82 Manual Availability ... 82
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Contents
Packing for Shipment ... 83 Introduction... 83 Returning the WT-5900 ... 83 General Instructions ... 83 Repacking in Original Carton ... 83 Repacking in a Different Carton ... 85 Specifications ... 87 Warming System Specifications ... 87 Transport and Shipping in Shipping Container ... 87 Compliance ... 88 Manufacturer’s Declaration ... 90 Ground Integrity Test... 94 Earth Leakage Current Test ... 94 Enclosure Leakage Current Test... 95 Principles of Operation ... 97 Control Panel ... 97 Main Circuit Board ... 98 DC Power Supply Circuit ... 98 Control Logic Circuit... 99 Automatic Temperature Stepdown ... 100 Alarm Drive Circuit ... 100 Temperature Control Circuit... 100 LCD Hour Meter... 100 AC Power Section... 101 Blower... 101 Heater... 101 Thermostat Protection... 102 Over-Temperature Test Port ... 102 Index... 105
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Figures Figure 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15: Figure 16: Figure 17: Figure 18: Figure 19: Figure 20: Figure 21: Figure 22: Figure 23: Figure 24: Figure 25: Figure 26: Figure 27: Figure 28: Figure 29: Figure 30: Figure 31: Figure 32: Figure 33: Figure 34: Figure 35: Figure 36: Figure 37: Figure 38: Figure 39:
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Cart Wheel Lock ... 5 Model WT-5900 Front View ... 7 Model WT-5900 Back View ... 8 Operating Hours Meter ... 9 Rear Panel Screws ... 10 HEPA Filter ... 11 Hose Replacement ... 12 Power Cord Routing ... 13 Over-Temperature Test Port ... 16 WarmTouch Boost Temperature Setting ... 17 Warning Light ... 17 Output Temperature Setup ... 19 Temperature Selection ... 19 Ground Stud ... 20 Power Cord ... 22 Rear Panel Screws ... 22 Power Cord ... 23 Cover Screw Locations ... 24 Separated Covers ... 24 Cable Harness Cable Ties-downs ... 26 Front Cover Assembly ... 26 Power Switch Removal ... 27 Cable Disconnect ... 27 Universal PCB Screws ... 28 Universal PCB Lights ... 29 Universal PCB Screws ... 29 Cable Connections ... 30 Power Switch Clips ... 30 Front cover Assembly Component Locations ... 31 Equipotential Ground ... 32 Cable Harness Cable Ties-downs ... 32 Cover Screw Locations ... 33 Universal PCB Connections ... 34 Universal PCB Screws ... 35 Universal PCB Solid State Relay Assembly ... 35 Part of Universal PCB ... 36 Universal PCB Alarm Jumper ... 36 Universal PCB Lights ... 37 Universal PCB Screws ... 37
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Figure 40: Figure 41: Figure 42: Figure 43: Figure 44: Figure 45: Figure 46: Figure 47: Figure 48: Figure 49: Figure 50: Figure 51: Figure 52: Figure 53: Figure 54: Figure 55: Figure 56: Figure 57: Figure 58: Figure 59: Figure 60: Figure 61: Figure 62: Figure 63: Figure 64: Figure 65: Figure 66: Figure 67: Figure 68: Figure 69: Figure 70: Figure 71: Figure 72: Figure 73: Figure 74: Figure 75: Figure 76: Figure 77: Figure 78: Figure 79: Figure 80: Figure 81:
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Cable Connections ... 38 Cable Harness Cable Ties-downs ... 38 Cover Screw Locations ... 39 Filter Removal ... 40 Blower Assembly Screws ... 41 Cable Harness Cable Ties-downs ... 42 Front Cover Assembly ... 42 Cable Disconnect ... 43 Duct Adapter Placement ... 44 Blower Motor Removal ... 45 Blower Assembly Clips ... 45 Rubber Washer ... 46 Heater Assembly ... 46 Heater Assembly Installation ... 47 Rubber Washer ... 48 Blower Assembly Clips ... 48 Blower Assembly Screws ... 49 Duct Adapter Placement ... 50 Cable Connections ... 50 Front Cover Assembly ... 51 Equipotential Ground Stud Wiring ... 52 Cable Harness Cable Ties-downs ... 52 Cover Screw Locations ... 53 Filter Installation ... 53 Filter Cover Installation ... 54 Thermistor Silicone ... 55 Thermistor Removal ... 56 Duct Adapter Removal ... 56 Duct Adapter Placement ... 57 Thermistor Position Within Duct Adapter ... 58 Cover Screw Locations ... 59 Rear Panel Screws ... 61 Filter Removal ... 61 Warming Unit Mounting Clamps ... 62 Cover Screw Locations ... 63 Separated Covers ... 64 Front Cover Assembly ... 64 Cable Disconnect ... 65 Thermistor Cable Removal ... 66 Blower Assembly Screws ... 66 Blower Capacitor ... 67 Blower Motor Removal ... 68
Contents
Figure 82: Figure 83: Figure 84: Figure 85: Figure 86: Figure 87: Figure 88: Figure 89: Figure 90: Figure 91: Figure 92: Figure 93: Figure 94: Figure 95: Figure 96: Figure 97: Figure 98: Figure 99: Figure 100: Figure 101: Figure 102: Figure 103: Figure 104: Figure 105:
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Blower Assembly Clips ... 68 Rubber Washer ... 69 Heater Assembly ... 69 Warming Unit Mounting Brackets ... 70 Heater Assembly Installation ... 70 Rubber Washer ... 71 Blower Installation ... 71 Blower Screws ... 72 Thermistor Cable Installation ... 72 Capacitor Installation ... 73 Cable Connections ... 73 Front Cover Assembly ... 74 Equipotential Ground Stud Wiring ... 75 Cable Harness Cable Ties-downs ... 75 Cover Screw Locations ... 76 Filter Installation ... 76 Filter Cover Installation ... 77 Spare Parts (Sheet 1) ... 81 Spare Parts (Sheet 2) ... 82 Packing ... 84 Control Panel ... 97 Remove Screws to Open Case ... 99 Hour Meter ... 101 5900 Schematic Diagram ... 103
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Ta b l e s Table 1: Table 2: Table 3: Table 4: Table 5: Table 6: Table 7: Table 8: Table 9: Table 10: Table 11: Table 12: Table 13:
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WT-5900 Symbols ... 6 HEPA Filter Replacement Equipment Required ... 9 Power Cord Replacement Equipment Required ... 12 Thermostat Protection Check Equipment Required ... 15 Output Temperature Check Equipment Required ... 18 Spare Parts and Accessories ... 80 Model WT-5900 Blower Specifications ... 87 Model WT-5900 Cart Specifications ... 87 Model WT-5900 Compliance ... 88 Electromagnetic Emissions ... 90 Electromagnetic Immunity ... 90 Electromagnetic Immunity, RF Portable Equipment ... 93 Recommended Separation Distances ... 94
Safety Information
Warnings WARNING: Possible explosion hazard. Do not use the WarmTouch® Model WT-5900 patient warming system in the presence of flammable anesthetic agents.
WARNING: Possible electrical shock hazard. Do not open or disassemble the warming system. If a malfunction occurs, please notify your sales/service center.
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. This could possibly cause the patient to be burned.
WARNING: Possible patient burns. Use caution and monitor closely if used on patients with severe peripheral vascular disease. This could possibly cause the patient to be burned.
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WARNING: Possible patient burns. Do not warm patients with the warming system hose only. Thermal injury may result. Always attach the hose to a WarmTouch blanket before providing warming therapy.
WARNING: WarmTouch CareDrape® and CareQuilt® blankets are for single patient use only.
WARNING: MRI scanning. 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.
Cautions 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: 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. Caution: The Model WT-5900 should not be operated in the presence of electromagnetic fields that are greater than three Volts per meter. This could cause shutdown of the Model WT-5900 by the fail-safe function within the equipment. Caution: Ensure that the patient is dry or the warming system may be ineffective.
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Introduction
Intended Use The WarmTouch Model WT-5900 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.
Manual Availability The most recent revision of this manual is available on the Internet at: http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/ProductManuals.html
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.1), 2) The warming system covers the patient with warm air and actively transfers heat across the skin. The result is to achieve normal thermia. 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.
1) Morris RH, Wilkey BR. "The Effects of the Ambient Temperature on Patient Temperature During Surgery Not Involving Body Cavities.” Anesthesiology 32:102-107, 1970. 2) Morris RH. “Influence of Ambient Temperature on Patient Temperature During Intraabdominal Surgery.” Annals of Surgery 173:230-233, 1971.
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Introduction
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 the Boost mode, blower temperature will automatically drop to the high mode after each 45- minutes of use. The temperature may be reset to the Boost mode by selecting the Boost temperature on the unit front 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 back-up systems automatically turn off the heater, illuminates the warning light and sounds an alarm. The warming system heater will start producing heat when the warming system temperature drops to approximately 55 ºC to 57 ºC.
Warning Light When the warning light on the control panel is illuminated, it indicates that one of the two thermostats has turned off the heater. The reason for the heater turn-off should be investigated as soon as possible after use.
HEPA Filter The system's High Efficiency Particulate Air Filter is 99.97% efficient at 0.3-micron particle size.
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Introduction
Over-Temperature Alarm An over-temperature alarm will sound when automatic over temperature shutdown occurs. The over-temperature alarm will continue to sound while the unit is in an over temperature shutdown condition.
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
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Symbols The symbols identified in Table 1 are the symbols used on the WT-5900 and all WT-5900 labeling. Table 1: WT-5900 Symbols Attention symbol, consult accompanying documentation Temperature Control Low (32 °C)
Temperature Control Medium (38 °C)
Temperature Control High (43 °C)
Temperature Control Boost (45 °C for 45 minutes)
Mains I Power On 0 Power Off Protection Class I Protection Type BF
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Introduction
Description of the Warming System The WarmTouch Model WT-5900 Patient warming system (Figure 2 and Figure 3), CareQuilt and CareDrape blankets are 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 epidual anesthesia due to hypothermia, or any patient who is uncomfortable anywhere in the cold critical care environment.
1 - Hose
4 - Power Cord
2 - Main Power Switch
5 - Hour Meter
3 - Nozzle
6 - Control Panel Figure 2: Model WT-5900 Front View
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1 - Over-Temperature Test Port
4 - Warning Label
2 - Bed Hook Bracket
5 - Nozzle Strap with Clip
3 - Filter Cover
6 - Instruction Label
Figure 3: Model WT-5900 Back View
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Routine Maintenance Caution: The institution should follow local governing ordances and recycling instructions regarding disposal or recycling of filter and device components or end of life of the product.
HEPA Filter Replacement The warming system filter should 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. The warming system total operating hours and the date of filter installation should be recorded on the new filter label and on the unit label when the filter is installed. See Figure 4 for the location of the Hour Meter on the warming system. Note: The warming system must be operating to read the total operating hours meter. Table 2: HEPA Filter Replacement Equipment Required Equipment Phillips Screwdriver
Description/Use #2, removing screws
1 - Operating Hours Meter Figure 4: Operating Hours Meter
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Routine Maintenance
WARNING: Do not operate the warming system with the back cover removed. 1. Write the date and total hours of operation of the warming system on the new filter label and unit label. 2. Unplug the warming system. 3. Lay the warming system on the front cover. 4. Unwrap the power cord from the rear of the warming system. 5. Remove the three screws from the rear of the warming system. See Figure 5.
Three Panel Screws Figure 5: Rear Panel Screws 6. Remove the WarmTouch Model WT-5900 Patient Warming System back panel.
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1 - HEPA Filter 2 - Power Cord Strain Relief Figure 6: HEPA Filter 7. Remove the filter. See Figure 6. 8. Place the new filter into the warming system. 9. Ensure that the power cord’s female connector is fully seated into the warming system case. 10. Place the warming system back panel on the case and insert the power cable into the power cable slot on the bottom of the case. 11. Align the back case with the three screw holes in the filter and install the three screws holding the back case to the unit.
Hose Replacement If the warming system hose is damaged, contact your local Nellcor representative to obtain a replacement hose. The hose for the warming system is made of plastic reinforced with wire. Caution: Only qualified hospital personnel should replace the hose. 1. The warming system hose unscrews clockwise (CW) from the warming system unit. Refer to Figure 7. The new hose should be screwed counterclockwise (CCW) into the warming system unit. 2. Slip the blanket clip onto the new hose.
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3. Remove the nozzle from the old hose and install the nozzle on the new hose. Refer to Nozzle Replacement on Figure 7.
1 Hose Connection
3 Blanket Clip
2 Hose
4 Nozzle
Figure 7: Hose Replacement
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.
Table 3: Power Cord Replacement Equipment Required Equipment Phillips Screwdriver
Description/Use #2, removing screws
1. Unplug the warming system power cord from the AC outlet. 2. Place the warming system unit on a workbench with the bottom of the unit facing you. 3. Unwind the power cord from the warming unit case. 4. Disconnect the power cord connector from the warming unit.
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1 - Equipotential ground
3 - Strain Relief
2 - Power Cord Female Connector
4 - Power Cord Routing
Figure 8: Power Cord Routing 5. Remove the power cord from the power cord routing bracket. 6. Connect the new power cord connector to the warming unit. 7. Insert the power cord into the power cord routing bracket. It may be necessary to use a screwdriver to separate the power cord routing bracket. 8. Tighten the power cord retaining bracket screws.
Nozzle Replacement If the nozzle is damaged, contact your Nellcor representative. The nozzle is held in place by four clips on the hose assembly. Pull and twist the nozzle to remove it. To replace the nozzle, push the new nozzle over the four clips on the hose assembly.
Cleaning the Warming System Caution: Do not spray, pour, or spill any liquid on the warming system, its accessories, connectors, switches, or openings in the case. For surface-cleaning and disinfecting, follow your institution's procedures or: •
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The warming system may be surface-cleaned by using a soft cloth dampened with either a commercial, nonabrasive cleaner or a solution of 70% alcohol in water, and lightly wiping the surfaces of the monitor.
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