Nellcor WarmTouch User manual

Service Manual

WarmTouch™

Convective Warming Unit

COVIDIEN, COVIDIEN with logo, and Covidien logo are U.S. and internationally registered trademarks of Covidien AG. Other brands are trademarks of a Covidien company.

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.1 Safety Symbol Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.2 Warnings (Service) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.3 Cautions (Service) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.2.4 Warnings (Patient Treatment) . . . . . . . . . . . . . . . . . . . . . . . .1-4

1.2.5 Cautions (Patient Treatment) . . . . . . . . . . . . . . . . . . . . . . . . .1-6

1.3 ESD (Electrostatic Discharge) Precautions . . . . . . . . . . . . . . . . . . .1-7

1.4 Tools Required for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

1.5 Serial Number, Software Version, and Error Codes . . . . . . . . . . . .1-9

1.6 Component Disposal - WEEE Directive . . . . . . . . . . . . . . . . . . . .1-11

1.7 Labeling Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12

1.8 Obtaining Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . .1-14

1.9 Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17

1.10 Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17

2 Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.2 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.2.2 Indications for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.3 Contraindications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.4 Covidien WarmTouch™ Warming Blankets . . . . . . . . . . . . . .2-2

2.3 Product Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

2.3.1 Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

2.3.2 Back View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

2.4 Operator’s Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

3.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

3.3 Attaching the Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.4 Installing the Warming Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3.4.1 IV Pole Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3.4.2 Bed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

3.4.3 Cart Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

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4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4.2 Safety Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4.3 Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

4.4 Overview of Warming Unit Operating Modes . . . . . . . . . . . . . . . .4-3

4.5 Beginning Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

4.6 Controlling the Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

4.6.1 Using Boost Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

4.6.2 Using the Heat Off Setting . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

4.6.3 Returning to Ready Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

4.6.4 Returning to Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.6.5 If Power is Interrupted... . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.7 Powering Off the Warming Unit . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

5.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

5.3 Cleaning the Warming Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

5.4 Safety Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

5.4.1 Physical Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

5.4.2 Temperature and Alarm Verification . . . . . . . . . . . . . . . . . . .5-3

5.4.3 Electrical Safety Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

5.5 Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

5.6 Monitoring the Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6.3 Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

6.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

6.3.2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

6.3.3 Component Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

6.3.4 Component Cable Connections . . . . . . . . . . . . . . . . . . . . . .6-8

6.4 Basic Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9

6.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12

7 Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

7.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

7.3 Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2

7.4 Service Screen Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2

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7.5 Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3

7.5.1 Power-On Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3

7.5.2 Keypad Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5

7.5.3 Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-7

7.5.4 Temperature Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . .7-8

7.5.5 Flow Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-10

7.5.6 Thermostat Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11

7.6 Electrical Safety Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-14

7.6.1 Ground Bond Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-14

7.6.2 Earth Leakage Current Test (Line Leakage) . . . . . . . . . . . . .7-14

7.6.3 Enclosure Leakage Current Test (Line Leakage) . . . . . . . . . .7-14

8 External Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . .8-1

8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1

8.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1

8.3 Pole Clamp Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2

8.4 USB Port Cover Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4

8.5 Power Cord Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5

8.6 Nozzle Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8

8.7 Nozzle Strap with Clip Replacement . . . . . . . . . . . . . . . . . . . . . .8-10

8.8 No Free-Hosing Label Replacement . . . . . . . . . . . . . . . . . . . . . . .8-11

9 Accessing the Inside of the Warming Unit . . . . . . . . . . . . . . . . . .9-1

9.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

9.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

9.3 Separating the Front and Rear Enclosures . . . . . . . . . . . . . . . . . . .9-2

9.4 Rejoining the Front and Rear Enclosures . . . . . . . . . . . . . . . . . . . .9-5

10 Internal Component Replacement (Inside Front Enclosure) . . .10-1

10.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

10.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2

10.3 Keypad Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3

10.4 Display (LCD) Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-8

10.5 User Interface (UI) PCBA Replacement . . . . . . . . . . . . . . . . . .10-12

10.6 Ribbon Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .10-19

10.7 USB Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-22

10.8 Clock Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .10-29

10.9 Power PCBA Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .10-31

10.10 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-35

10.11 Speaker Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-37

10.12 Speaker Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . .10-40

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10.13 Power Supply Replacement . . . . . . . . . . . . . . . . . . . . . . . . .10-43

10.14 Power Supply Output Cable Replacement . . . . . . . . . . . . . . .10-46

10.15 Ground Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . .10-48

10.16 AC Power Inlet Replacement . . . . . . . . . . . . . . . . . . . . . . . .10-51

10.17 Equipotential Stud Replacement . . . . . . . . . . . . . . . . . . . . . .10-55

11 Internal Component Replacement (Inside Rear Enclosure) . . .11-1

11.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1

11.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2

11.3 Thermistor Sensor Assembly Replacement . . . . . . . . . . . . . . . .11-3

11.4 Thermostat Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-9

11.5 Thermostat Cable Replacement . . . . . . . . . . . . . . . . . . . . . . .11-14

11.6 Pole Clamp and Mounting Bolt Replacement . . . . . . . . . . . . .11-18

11.7 Hose Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-21

11.8 Hose Duct Adapter Replacement . . . . . . . . . . . . . . . . . . . . . .11-25

11.9 Fan Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .11-33

11.10 Heater Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . .11-43

12 Enclosure Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1

12.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1

12.2 Safety Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1

12.3 Front Enclosure Replacement . . . . . . . . . . . . . . . . . . . . . . . . . .12-2

12.4 Filter Enclosure Replacement . . . . . . . . . . . . . . . . . . . . . . . . .12-12

12.5 Rear Enclosure Replacement . . . . . . . . . . . . . . . . . . . . . . . . . .12-15

13 Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

13.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

13.2 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

13.2.1 Warming Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

13.2.2 Transport Cart (Optional) . . . . . . . . . . . . . . . . . . . . . . . . .13-1

13.3 Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-2

13.4 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .13-2

13.4.1 Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-2

13.4.2 Shipping and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-2

13.5 Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-3

13.6 Product Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-3

13.7 Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . . . . .13-4

13.7.1 Manufacturer’s Declaration . . . . . . . . . . . . . . . . . . . . . . . .13-4

13.7.2 Electromagnetic Emissions . . . . . . . . . . . . . . . . . . . . . . . . .13-4

13.7.3 Electromagnetic Immunity . . . . . . . . . . . . . . . . . . . . . . . . .13-5

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14 Packing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-1

14.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-1

14.2 Returning the Warming Unit to Covidien . . . . . . . . . . . . . . . . .14-1

14.3 Packing in the Original Carton . . . . . . . . . . . . . . . . . . . . . . . . .14-2

14.4 Packing in a Different Carton . . . . . . . . . . . . . . . . . . . . . . . . . .14-4

A Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

A.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

A.2 External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

A.3 Internal Components (Inside Front Enclosure) . . . . . . . . . . . . . . . A-3

A.4 Internal Components (Inside Rear Enclosure) . . . . . . . . . . . . . . . A-5

A.5 Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

A.6 Miscellaneous Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

A.7 Parts Locator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

B Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

B.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

B.2 Error Codes and Suggested Resolutions . . . . . . . . . . . . . . . . . . . .B-2

C Service Test Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

C.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1

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Figures

1 Introduction

Figure 1-1 Serial Number Label on Back of Warming Unit . . . . . . . . . . . .1-9

Figure 1-2 Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Figure 1-3 System Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2 Product Overview

Figure 2-1 Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Figure 2-2 Back View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Figure 2-3 Operator’s Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

3 Installation

Figure 3-1 Positioning the Unit for Power Cord Installation . . . . . . . . . . .3-2

Figure 3-2 Power Cord Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

Figure 3-3 Power Cord Wrapped and Secured . . . . . . . . . . . . . . . . . . . .3-4

Figure 3-4 Back View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

Figure 3-5 Warming Unit Mounted on IV Pole . . . . . . . . . . . . . . . . . . . . .3-7

Figure 3-6 Bed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

Figure 3-7 Back View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

Figure 3-8 Cart Mounting Peg and Warming Unit Mounting Hole . . . . .3-10

Figure 3-9 Warming Unit Mounted on Cart . . . . . . . . . . . . . . . . . . . . . .3-11

4 Operation

Figure 4-1 Main Screen at Power-On . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Figure 4-2 Replace Filter Screen at Power-On . . . . . . . . . . . . . . . . . . . . . .4-4

Figure 4-3 Warming System Set to 40°C (Medium) . . . . . . . . . . . . . . . . .4-6

Figure 4-4 Warming System Set to Boost Mode . . . . . . . . . . . . . . . . . . . .4-6

Figure 4-5 Warming System Set to Heat Off . . . . . . . . . . . . . . . . . . . . . .4-7

Figure 4-6 Warming System Set to Ready Mode . . . . . . . . . . . . . . . . . . .4-7

5 Maintenance

Figure 5-1 Replace Filter Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

Figure 5-2 Filter Enclosure and Power Cord Connection . . . . . . . . . . . . . .5-5

Figure 5-3 HEPA Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Figure 5-4 Gasket inside Filter Enclosure . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Figure 5-5 Replace Filter Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Figure 5-6 Filter Information Screen - Filter Expired . . . . . . . . . . . . . . . . .5-8

Figure 5-7 Main Screen at Power-On . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

Figure 5-8 Power Cord Wrapped and Secured . . . . . . . . . . . . . . . . . . . .5-9

Service Manual vii

Figure 5-9 Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

Figure 5-10 Filter Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11

6 Troubleshooting

Figure 6-1 Warming Unit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .6-3

Figure 6-2 Cable Connections Between Major Components . . . . . . . . . .6-8

Figure 6-3 Low-Priority Alarm (Left) and Medium-Priority Alarm (Right) .6-12

7 Performance Verification

Figure 7-1 Key Code Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2

Figure 7-2 Main Screen at Power-On . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4

Figure 7-3 Replace Filter Screen at Power-On . . . . . . . . . . . . . . . . . . . . . .7-4

Figure 7-4 Position of Hose for Temperature Accuracy Test . . . . . . . . . . .7-8

Figure 7-5 Position of Hose for Flow Test . . . . . . . . . . . . . . . . . . . . . . . .7-10

Figure 7-6 Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11

Figure 7-7 Key Code Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11

Figure 7-8 Select Test Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-12

Figure 7-9 Thermostat Test Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-12

8 External Component Replacement

Figure 8-1 Pole Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2

Figure 8-2 Pole Clamp Foot and Knob . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3

Figure 8-3 USB Port Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4

Figure 8-4 Power Cord Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5

Figure 8-5 Power Cord Wrapped and Secured . . . . . . . . . . . . . . . . . . . . .8-7

Figure 8-6 Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8

Figure 8-7 Nozzle Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9

Figure 8-8 Nozzle Strap with Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10

Figure 8-9 No Free-Hosing Labels on Front Enclosure (L) and Nozzle (R) .8-11

9 Accessing the Inside of the Warming Unit

Figure 9-1 Separated Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2

Figure 9-2 Power Cord Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3

Figure 9-3 Enclosure Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4

Figure 9-4 Rejoining the Enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5

Figure 9-5 Power Cord Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-6

Figure 9-6 Power Cord Wrapped and Secured . . . . . . . . . . . . . . . . . . . . .9-7

10 Internal Component Replacement (Inside Front Enclosure)

Figure 10-1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3

Figure 10-2 Keypad Cable Connection on UI PCBA . . . . . . . . . . . . . . . .10-4

viii Service Manual

Figure 10-3 Removing the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-5

Figure 10-4 Feeding the Keypad Cable Through the Access Slot . . . . . .10-6

Figure 10-5 Aligning the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-6

Figure 10-6 Keypad Cable Secured by Locking Bar . . . . . . . . . . . . . . . . .10-7

Figure 10-7 Display behind UI PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . .10-8

Figure 10-8 Display Cable Connection on UI PCBA . . . . . . . . . . . . . . . .10-9

Figure 10-9 Positioning the Display . . . . . . . . . . . . . . . . . . . . . . . . . . .10-10

Figure 10-10 UI PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-12

Figure 10-11 UI PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .10-14

Figure 10-12 USB Connection on UI PCBA . . . . . . . . . . . . . . . . . . . . . .10-15

Figure 10-13 Attaching Backing Plate and Cable Tie to UI PCBA . . . . .10-16

Figure 10-14 Keypad Cable Secured by Locking Bar . . . . . . . . . . . . . . .10-18

Figure 10-15 Ribbon Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-19

Figure 10-16 Ribbon Cable Connections . . . . . . . . . . . . . . . . . . . . . . .10-20

Figure 10-17 USB Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-22

Figure 10-18 USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-23

Figure 10-19 UI PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .10-24

Figure 10-20 USB Connection on UI PCBA . . . . . . . . . . . . . . . . . . . . . .10-25

Figure 10-21 Attaching Backing Plate and Cable Tie to UI PCBA . . . . .10-26

Figure 10-22 Keypad Cable Secured by Locking Bar . . . . . . . . . . . . . . .10-28

Figure 10-23 Clock Battery on UI PCBA . . . . . . . . . . . . . . . . . . . . . . . .10-29

Figure 10-24 Power PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-31

Figure 10-25 Power PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . .10-33

Figure 10-26 Fuses on Power PCBA . . . . . . . . . . . . . . . . . . . . . . . . . . .10-35

Figure 10-27 Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-37

Figure 10-28 Speaker Cable Connections . . . . . . . . . . . . . . . . . . . . . .10-38

Figure 10-29 Speaker Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-40

Figure 10-30 Speaker Cable Connections . . . . . . . . . . . . . . . . . . . . . .10-41

Figure 10-31 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-43

Figure 10-32 Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . .10-44

Figure 10-33 Power Supply Output Cable . . . . . . . . . . . . . . . . . . . . . .10-46

Figure 10-34 Power Supply Output Cable Connections . . . . . . . . . . . .10-47

Figure 10-35 Ground Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-48

Figure 10-36 Ground Cable Terminal on Equipotential Stud . . . . . . . .10-49

Figure 10-37 AC Power Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-51

Figure 10-38 AC Power Inlet Connections . . . . . . . . . . . . . . . . . . . . . .10-52

Figure 10-39 Equipotential Stud Connections . . . . . . . . . . . . . . . . . . .10-53

Figure 10-40 Equipotential Stud . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-55

Figure 10-41 Equipotential Stud Connections . . . . . . . . . . . . . . . . . . .10-56

Figure 10-42 Equipotential Stud and Washer . . . . . . . . . . . . . . . . . . . .10-57

Service Manual ix

11 Internal Component Replacement (Inside Rear Enclosure)

Figure 11-1 Thermistor Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . .11-3

Figure 11-2 Thermistor Wire and Rivet . . . . . . . . . . . . . . . . . . . . . . . . . .11-4

Figure 11-3 Thermistor Cable Connections . . . . . . . . . . . . . . . . . . . . . .11-5

Figure 11-4 Attaching Rivet to Thermistor Wire . . . . . . . . . . . . . . . . . . .11-6

Figure 11-5 Inserting Thermistor Wire and Rivet . . . . . . . . . . . . . . . . . .11-6

Figure 11-6 Thermistor Position Inside Hose Duct Adapter . . . . . . . . . . .11-7

Figure 11-7 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . . . .11-7

Figure 11-8 Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-9

Figure 11-9 Thermostat Cable Connection to Thermostat . . . . . . . . . .11-10

Figure 11-10 Thermostat Rivets (Outside of Hose Duct Adapter) . . . . .11-11

Figure 11-11 Thermostat Rivets (Inside of Hose Duct Adapter) . . . . . . .11-12

Figure 11-12 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-12

Figure 11-13 Thermostat Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-14

Figure 11-14 Thermostat Cable Connection to Power PCBA . . . . . . . .11-15

Figure 11-15 Thermostat Cable Connection to Thermostat . . . . . . . . .11-16

Figure 11-16 Pole Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18

Figure 11-17 Pole Clamp Foot and Knob . . . . . . . . . . . . . . . . . . . . . . .11-19

Figure 11-18 Pole Clamp Mounting Bolt . . . . . . . . . . . . . . . . . . . . . . .11-20

Figure 11-19 Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-21

Figure 11-20 Wire Attaching Hose to Hose Duct Adapter . . . . . . . . . .11-22

Figure 11-21 Inserting Hose Duct Adapter . . . . . . . . . . . . . . . . . . . . . .11-23

Figure 11-22 Hose Duct Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-25

Figure 11-23 Thermistor Wire and Rivet . . . . . . . . . . . . . . . . . . . . . . . .11-26

Figure 11-24 Thermostat Cable Connection to Thermostat . . . . . . . . .11-27

Figure 11-25 Wire Attaching Hose to Hose Duct Adapter . . . . . . . . . .11-28

Figure 11-26 Thermostat Rivets (Outside of Hose Duct Adapter) . . . . .11-29

Figure 11-27 Thermostat Rivets (Inside of Hose Duct Adapter) . . . . . . .11-30

Figure 11-28 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-31

Figure 11-29 Inserting Thermistor Wire and Rivet . . . . . . . . . . . . . . . .11-32

Figure 11-30 Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-33

Figure 11-31 USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-34

Figure 11-32 Filter Enclosure and Screws . . . . . . . . . . . . . . . . . . . . . . .11-35

Figure 11-33 Power PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . .11-36

Figure 11-34 Fan Assembly Screws . . . . . . . . . . . . . . . . . . . . . . . . . . .11-37

Figure 11-35 Cable Tie Securing Fan Cable to Thermistor Cable . . . . .11-38

Figure 11-36 Position of Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . .11-39

Figure 11-37 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-40

Figure 11-38 Securing the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-40

Figure 11-39 USB Connector in Rear Enclosure . . . . . . . . . . . . . . . . . .11-41

Figure 11-40 Heater Assembly (below Fan Assembly) . . . . . . . . . . . . . .11-43

x Service Manual

Figure 11-41 USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-44

Figure 11-42 Filter Enclosure and Screws . . . . . . . . . . . . . . . . . . . . . . .11-45

Figure 11-43 Power PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . .11-46

Figure 11-44 Fan Assembly Screws . . . . . . . . . . . . . . . . . . . . . . . . . . .11-47

Figure 11-45 Fan Assembly and Hose Duct Adapter . . . . . . . . . . . . . . .11-48

Figure 11-46 Fan Assembly Pulled for Heater Replacement . . . . . . . . .11-49

Figure 11-47 Heater Assembly and Gasket . . . . . . . . . . . . . . . . . . . . .11-50

Figure 11-48 Routing of Heater Wires . . . . . . . . . . . . . . . . . . . . . . . . .11-51

Figure 11-49 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-52

Figure 11-50 Securing the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .11-52

Figure 11-51 USB Connector in Rear Enclosure . . . . . . . . . . . . . . . . . .11-53

Figure 11-52 Routing of Cables around Fan Assembly . . . . . . . . . . . . .11-54

12 Enclosure Replacement

Figure 12-1 Front Enclosure – Components to be Removed/Reinstalled .12-2

Figure 12-2 Equipotential Stud Connections . . . . . . . . . . . . . . . . . . . . .12-3

Figure 12-3 AC Power Inlet Connections . . . . . . . . . . . . . . . . . . . . . . . .12-4

Figure 12-4 Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . . .12-5

Figure 12-5 Speaker Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-6

Figure 12-6 Power PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . . . .12-7

Figure 12-7 UI PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-8

Figure 12-8 Keypad Cable Secured by Locking Bar . . . . . . . . . . . . . . . . .12-9

Figure 12-9 Filter Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-12

Figure 12-10 Power Cord Wrapped and Secured . . . . . . . . . . . . . . . . .12-14

Figure 12-11 Rear Enclosure (Outside) – Components to be

Removed/Reinstalled . . . . . . . . . . . . . . . . . . . . . . . . . . .12-15

Figure 12-12 Rear Enclosure (Inside) – Components to be

Removed/Reinstalled . . . . . . . . . . . . . . . . . . . . . . . . . . .12-16

Figure 12-13 USB Connector and Screws . . . . . . . . . . . . . . . . . . . . . . .12-18

Figure 12-14 Filter Enclosure and Power Cord Connection . . . . . . . . . .12-19

Figure 12-15 Power PCBA Connections . . . . . . . . . . . . . . . . . . . . . . . .12-20

Figure 12-16 Cable Ties to be Removed from Rear Enclosure . . . . . . . .12-21

Figure 12-17 Fan Assembly Screws . . . . . . . . . . . . . . . . . . . . . . . . . . .12-22

Figure 12-18 Heater Assembly and Gasket . . . . . . . . . . . . . . . . . . . . .12-23

Figure 12-19 Pole Clamps and Mounting Bolts . . . . . . . . . . . . . . . . . .12-24

Figure 12-20 Serial Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-25

Figure 12-21 Cable Tie Mount for Thermistor Cable . . . . . . . . . . . . . .12-25

Figure 12-22 Position of Heater Cone and Screen . . . . . . . . . . . . . . . .12-26

Figure 12-23 Routing of Heater Wires . . . . . . . . . . . . . . . . . . . . . . . . .12-27

Figure 12-24 Position of Hose Duct Adapter . . . . . . . . . . . . . . . . . . . .12-28

Figure 12-25 Inserting the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .12-29

Service Manual xi

Figure 12-26 Securing the Hose Duct Adapter . . . . . . . . . . . . . . . . . . .12-29

Figure 12-27 USB Connector in Rear Enclosure . . . . . . . . . . . . . . . . . .12-30

Figure 12-28 Thermistor Cable Secured . . . . . . . . . . . . . . . . . . . . . . . .12-31

Figure 12-29 Cable Ties and Routing of Cables . . . . . . . . . . . . . . . . . .12-32

Figure 12-30 Serial Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-33

14 Packing for Shipment

Figure 14-1 Packing in the Original Carton . . . . . . . . . . . . . . . . . . . . . .14-3

A Parts and Accessories

Figure A-1 External Components (Front) . . . . . . . . . . . . . . . . . . . . . . . . A-8

Figure A-2 External Components (Back) . . . . . . . . . . . . . . . . . . . . . . . . . A-9

Figure A-3 External Components (Bottom) . . . . . . . . . . . . . . . . . . . . . . A-10

Figure A-4 HEPA Filter (Filter Enclosure Removed) . . . . . . . . . . . . . . . . A-10

Figure A-5 Internal Components (Inside Front Enclosure) . . . . . . . . . . . A-11

Figure A-6 Internal Components (Inside Rear Enclosure) . . . . . . . . . . . A-12

xii Service Manual

1 Introduction

1.1 Overview

This manual, for use by qualified personnel only, contains instructions for servicing, testing, and maintaining the Covidien WarmTouch™ Convective Warming Unit. The manual includes all information necessary for troubleshooting problems with the warming unit and replacing affected components, including parts lists, replacement procedures, and system diagrams.

Safety Information Page 1-2

ESD (Electrostatic Discharge) Precautions Page 1-7

Tools Required for Service Page 1-7

Serial Number, Software Version, and Error Codes Page 1-9

Component Disposal - WEEE Directive Page 1-11

Labeling Symbols Page 1-12

Obtaining Technical Assistance Page 1-14

1.2 Safety Information

This section lists safety information associated with the warming unit. Where appropriate in the manual, individual Warnings and Cautions are repeated as reminders. Please familiarize yourself with this safety information before servicing the warming unit.

For reference, additional Warnings and Cautions that apply to operating the warming system in the clinical environment are provided in Warnings (Patient

Treatment) on page 1-4 and Cautions (Patient Treatment) on page 1-6.

1.2.1 Safety Symbol Definitions

Table1-1.Safety Symbol Definitions

Symbol Definition

WARNING

Warnings alert users to potential serious outcomes (death, injury, or adverse events) to the patient, user, or environment.

Caution

Cautions alert users to exercise appropriate care for safe and effective use of the product.

Note

Notes provide additional guidelines or information.

1.2.2 Warnings (Service)

 WARNING:

Possible electric shock hazard. Grounding reliability can be achieved only when the warming unit is connected to a suitable mains outlet with protective earth grounding.

 WARNING:

The use of accessories or cables with the warming system other than those indicated in this manual may result in non-compliance with the specifications listed in Electromagnetic Compatibility (EMC) on page 13-4.

1-2 Service Manual

 WARNING:

No modification of this equipment is allowed. Modification can result in death, injury, or property damage.

 WARNING:

Before attempting to open or disassemble the warming unit, disconnect the power cord from the AC power source.

 WARNING:

Do not operate the warming unit with the filter enclosure removed.

1.2.3 Cautions (Service)

Safety Information

 Caution:

Do not spray, pour, or spill any liquid on the warming unit, its accessories, connectors, switches, or openings in the case.

 Caution:

The HEPA filter must whichever comes first.

 Caution:

Operation of the warming system may affect or be affected by other devices in the vicinity due to electromagnetic interference (EMI). If interference occurs, try increasing the distance between devices, repositioning the cabling, or plugging the devices into separate outlet circuit branches. Reference

Electromagnetic Compatibility (EMC) on page 13-4 for additional guidance.

 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.

be replaced every 2,000 hours of operation or 365 days,

 Caution:

Observe ESD (electrostatic discharge) precautions when servicing the warming unit.

Service Manual 1-3

Introduction

 WARNING:

1.2.4 Warnings (Patient Treatment)

The following additional Warnings apply to operating the warming system in a clinical environment for patient treatment:

Possible explosion hazard. Do not use the device in the presence of flammable anesthetics or in an oxygen-rich environment.

No free-hosing. Keep hose nozzle connected to a WarmTouch™ blanket at all times or thermal injury may occur.

Possible burn or infection hazard. Do not allow warming blanket to come in contact with open wounds. All patients’ 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:

Thermal injury may occur if the warming unit hose comes into contact with the patient.

 WARNING:

Possible fire hazard. Prevent the blanket material from coming into contact with a laser or an electrosurgical active electrode.

 WARNING:

Continuously monitor the patient's temperature during treatment with the warming system. Use good clinical judgment in selecting and adjusting temperature settings based on the patient's warming needs and response to treatment.

1-4 Service Manual

 WARNING:

Using the warming system on patients with transdermal medication patches may increase the rate of drug delivery, potentially causing harm to the patient.

 WARNING:

Thermally conductive materials, such as water, gel, and similar substances, can decrease the patient's body temperature when the warming unit is switched off.

 WARNING:

Do not use the warming system during magnetic resonance imaging (MRI) scanning.

Safety Information

 WARNING:

Do not operate the warming system in a stacked configuration with other equipment.

 WARNING:

Do not operate the warming system adjacent to other equipment. If such a configuration cannot be avoided, first test the warming system in the intended configuration to verify normal operation.

 WARNING:

Use WarmTouch™ blankets only as directed. Carefully follow the Instructions for Use provided with the blankets regarding proper handling and

positioning.

 WARNING:

WarmTouch™ blankets are for single patient use only.

 WARNING:

Clean the warming unit after each use, as described in this manual.

 WARNING:

If a fault or sudden change in performance occurs in the warming system, discontinue use. Notify your sales/service center. The unit must be serviced by qualified personnel using procedures provided in the Service Manual.

Service Manual 1-5

Introduction

 WARNING:

 Caution:

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.

1.2.5 Cautions (Patient Treatment)

The following additional Cautions apply to operating the warming system in a clinical environment for patient treatment:

Federal (U.S.A.) law restricts the use of the warming system to sale by or on the order of a physician.

 Caution:

Only use WarmTouch™ blankets with the WarmTouch warming unit. Do not attempt to use other types of blankets with the warming unit. Similarly, do not attempt to use WarmTouch blankets with other types of warming units.

 Caution:

The USB port on the warming unit is for service use by qualified personnel only. During patient treatment, a USB cable must not

warming unit.

be connected to the

1-6 Service Manual

ESD (Electrostatic Discharge) Precautions

1.3 ESD (Electrostatic Discharge) Precautions

 Caution:

Observe ESD (electrostatic discharge) precautions when servicing the warming unit.

To avoid damaging ESD-sensitive components while service the warming unit, follow all appropriate ESD guidelines. These guidelines include:

• Using an ESD wrist strap, properly connected to a reliable ground.

• Using an anti-static mat.

• Handling ESD-sensitive components properly. (Do not touch connection points,

connector pins, leads, or terminals.)

• Keeping non-conducting materials (plastic containers, foam cups, synthetic cloth-

ing, cellophane tape, etc.) away from the work area.

1.4 Tools Required for Service

• Electrical leakage tester

• Ground bond tester

• Ohmmeter or digital multi-meter with resistance function

• Temperature probe (see page 7-2 for requirements)

• Torque driver with:

#1 Phillips bit #2 Phillips bit 11/32” hex socket 10mm hex socket

(See Table 1-2 on page 1-8 for torque requirements.)

• 10 mm open-end or box wrench

• 70% isopropyl alcohol solution and soft cloth for cleaning

• Small flat-blade screwdriver

• Pliers

Service Manual 1-7

Introduction

• Medium flat-blade screwdriver with long handle

• Knife, box cutter, or similar tool with a thin, stiff blade

• Wire cutters

• Small knife or scissors

• Cable ties

• Strap or cable tie to wrap around handle of unit and hose duct adapter

• Non-metallic stylus or similar tool

• Ruler

• Small rubber mallet or similar tool

• Handheld blow-dryer

Table1-2.Torque Requirements

Item Bit Torque (Metric) Torque (English)

USB port cover screw Phillips #2 1.1 to 1.5 N-m 9.7 to 13.3 lb-in

USB cable connector screws Phillips #1 0.18 to 0.27 N-m 1.6 to 2.4 lb-in

Filter enclosure screws Phillips #2 1.2 to 1.6 N-m 10.6 to 14.2 lb-in

Front/rear enclosure screws Phillips #2 1.1 to 1.5 N-m 9.7 to 13.3 lb-in

UI PCBA screws 11/32" socket 0.4 to 0.6 N-m 3.5 to 5.3 lb-in

Power PCBA screws Phillips #2 1.1 to 1.5 N-m 9.7 to 13.3 lb-in

Speaker screws Phillips #2 1.1 to 1.5 N-m 9.7 to 13.3 lb-in

Power supply screws Phillips #1 0.4 to 0.6 N-m 3.5 to 5.3 lb-in

Equipotential stud screws 10mm socket 3.2 to 3.8 N-m 28.3 to 33.6 lb-in

AC power inlet screws Phillips #1 0.4 to 0.6 N-m 3.5 to 5.3 lb-in

Fan assembly screws Phillips #2 1.1 to 1.5 N-m 9.7 to 13.3 lb-in

1-8 Service Manual

Serial Number, Software Version, and Error Codes

1.5 Serial Number, Software Version, and Error

Codes

Prior to servicing the warming unit, note the unit’s serial number, software version, and any error codes.

The serial number is located on the back of the warming unit (Figure 1-1).

Figure1-1.Serial Number Label on Back of Warming Unit

The software version number and error codes can be obtained from the warming unit’s System Information screen as described below.

To access the System Information screen:

1. Plug the warming unit’s power cord into the outlet, and press the On/Standby

key.

2. Press the Menu key. The Menu screen appears (Figure 1-2).

Service Manual 1-9

Introduction

Figure1-2.Menu Screen

3. Press the System Information key. The System Information screen shows the

software version and the most recent error messages, if any (Figure 1-3).

Figure1-3.System Information Screen

1 Software Version 2 Error Messages (Up to Six)

 Note:

Time stamps associated with error messages do not necessarily reflect local time. The warming unit is set to UTC (Coordinated Universal Time) at manufacture.

4. To return to the Main screen, press the Exit key twice.

5. Press the On/Standby key to power off the unit.

1-10 Service Manual

Component Disposal - WEEE Directive

1.6 Component Disposal - WEEE Directive

The warming unit contains components that must be disposed of in accordance with WEEE Directive. Do not dispose of the warming unit as a whole or the following individual components as unsorted municipal waste:

• Power cord – page 8-5

• Display (LCD) – page 10-8

• User Interface (UI) PCBA – page 10-12

• Clock battery – page 10-29

• Power PCBA – page 10-31

• Power supply – page 10-43

Service Manual 1-11

Introduction

1.7 Labeling Symbols

Table 1-3 defines the symbols that appear on the warming unit or its shipping

label.

Table1-3.Symbols on the Warming Unit and Shipping Label

Symbol Description Appears On...

Warming

Unit

By prescription only X X

No Free Hosing: Hose nozzle must be connected to a WarmTouch™ blanket or thermal injury may occur.

Do not use during magnetic resonance imaging (MRI). X X

Degree of protection from electric shock: Protection Class I, Type BF applied part

Recommendation to consult accompanying documents X X

Requirement to consult accompanying documents X X

Nature of power supply: Alternating Current (AC) X

Potential equalization conductor terminal Used to access the warming unit’s electrical ground for

electrical safety testing

Shipping

Label

Universal Serial Bus (USB) port (For service use by qualified personnel only)

Keep dry X X

Temperature limitations (shipping/storage): -40°C to +70°C

1-12 Service Manual

Table1-3.Symbols on the Warming Unit and Shipping Label (Continued)

Symbol Description Appears On...

Labeling Symbols

Warming

Unit

Temperature limitations (operating): +18°C to +28°C X

Relative humidity limitations (shipping/storage): 10% to 95% (non-condensing)

Relative humidity limitations (operating): 15% to 85% (non-condensing)

Atmospheric pressure limitations (shipping/storage): 12 kPa to 106 kPa

Atmospheric pressure limitations (operating): 70 kPa to 106 kPa

CE – Conformité Européene authorization mark 0123 – TÜV SÜD Product Service GmbH (notified body) Signifies compliance with Medical Device Directive

93/42/EEC

Shipping

Label

CSA – Canadian Standards Association certification mark

European Community (EC) authorized representative X X

Serial number X X

Catalog number X X

Manufacturer X X

Date of manufacture X X

Proper waste disposal for electrical and electronic equipment (WEEE)

Service Manual 1-13

Introduction

1.8 Obtaining Technical Assistance

For technical assistance or to order parts and additional manuals, contact Covidien Technical Services or a local Covidien representative.

When contacting Covidien for troubleshooting or service issues, please provide the information described in Serial Number, Software Version, and Error Codes on page 1-9.

Covidien Technical Services

Covidien Argentina

Aguero 351 Capital Federal - 1171 ABC Argentina Tel: (5411) 4863-5300 Fax: (5411) 4863-4142

Covidien Austria GmbH

Campus21 Europaring F09402 Brunn am Gebrige A-2345 Österreich Tel: (+43) 2236 - 3788 39 Fax: (+43) 2236 - 3788 3940

Covidien Canada

19600 Clark Graham Baie d'Urfe, QC, H9X 3R8 Canada Tel:1-514-695-1220, Ext.4004 Fax: 1-514-695-4965

Covidien Colombia

Edificio Prados de la Morea Carretera Central Del Norte (Cra 7a) Kilometro 18, Chia-Cundinamarca Bogota, Colombia Tel: (571) 619-5469 Fax: (571) 619-5425

Covidien Asia

Singapore Regional Service Centre 15 Pioneer Hub, #06-04 Singapore 627753 Tel (65) 6578 5288 Fax (65) 6515 5260

Covidien Belgie S.A.-N.V.

Generaal De Wittelaan 9/5 Mechelen 2800 België Tel +32 152 981 37 Fax +32 152 167 83

Covidien Chile

Camino lo Boza (Ex 8395) Pudehuel Santiago Chile Tel: (562) 739 - 3000 Fax: (562) 783 - 3149

Covidien Costa Rica

Global Park, Parkway 50 La Auroa de Heredia Costa Rica Tel: (506) 2239 - 5386 Fax: (506) 2239 - 5319

Covidien Australia

52A Huntingwood Drive Huntingwood, NSW 2148 Australia Tel: (+61) 1800 - 350702 Fax: (+61) 2967 - 18118

Covidien Brazil

Av. Das Nações Undias 12995 Andar 23 - Brooklin São Paulo, SP Brasil 04578-000 Tel: (5511) 2187-6200 Fax: (5511) 2187-6380

Covidien China

2F, Tyco Plaza 99 Tian Zhou Rd Shang Hai 200233 P.R. China Tel: (+86) 4008 1886 86 Fax: (+86) 2154 4511 18

Covidien ECE

Prosecká 851/64 190 00 Praha 9 Česká republika Tel: +420 239 000 711 Fax: +420 239 000 437

1-14 Service Manual

Covidien Technical Services (Continued)

Obtaining Technical Assistance

Covidien Danmark A/S

Langebrogade 6E, 4. sal 1411 København K Danmark Tel +45 702 753 50 Fax:+45 702 756 50

Covidien Finland Oy

Läkkisepäntie 23 00620 Helsinki Finland Te. +35 896 226 84 10 Fax +35 896 226 84 11

Covidien India

10th Floor Building No 9B DLF Cyber City Phase III Gurgaon Haryana - 122002 India Tel + 91 1244 709800 Fax + 91 1244 206850

Covidien Deutschland GmbH

Technisches Service Center Raffineriestr. 18 93333 Neustadt / Donau Germany Tel + 49 944 595 93 80 Fax + 49 944 595 93 65

Covidien France SA

Parc d'affaires Technopolis Bat. Sigma, 3 Avenue du Canada LP 851 Les Ulis 91975 Courtaboeuf Cedex France Tel +33 169 821 416 Fax +33 169 821 532

Covidien Hungary

1095 Budapest Mariassy u. 7 Magyarorszag Hungary Tel + 36 1880 7975 Fax + 36 1777 4932

Covidien ECE

Galvaniho 7/a 821 04 Bratislava Slovakia Tel.: +421 248 214 573 Fax: +421 248 214 501

Covidien Hong Kong

Unit 12 - 16, 18/F BEA Tower Millennium City 5 4187 Kwun Tong Road Kwum Tong, Kowloon, Hong Kong Tel + 852 3157 7299 Fax + 852 2838 0749

Covidien Ireland

Block G, Ground Floor, Cherrywood Technology Park, Loughlinstown County Dublin, Ireland Tel +353 1 4381613 Fax 353 1 439 3039

Covidien Israel

5 Shacham St. North Industrial Park Caesarea 38900 Israel Tel +97 246 277 388 Fax+97 266 277 688

Covidien Korea

5F, Hibrand Living Gwan, #215, Yangjae-Dong, Seocho-Gu Seoul, Korea Tel: +822 570 5459 Fax: +822 570 5499

Covidien Italia S.p.A.

Via Rivoltana 2/D 20090 Segrate Italy Tel +39 027 030 81 31 Fax +39 027 031 72 84

Covidien Mexico

Insurgentes Sur # 863, Piso 16 Col. Nápoles Del. Benito Juarez Mexico, D.F. 03810 Mexico Tel: (5255) 5804-1524 Fax: (5255) 5536-1326

Covidien Japan Inc.

Technical Support Center 83-1, Takashimadaira 1Chome Itabashi-ku, Tokyo 175-0082 Japan Tel: +81 (0) 3 6859 0120 Fax: +81 (0) 3 6859 0142

Covidien Nederland BV

Hogeweg 105 5301 LL Zaltbommel Nederland Tel +31 41 857 66 00

Service Manual 1-15

Introduction

Covidien Technical Services (Continued)

Covidien Norge AS

Postboks 343 1372 Asker. Norway Tel +47 668 522 22 Fax +47 668 522 23

Covidien Portugal Lda.

Estrada do Outeiro de Polima, Lote 10-1° Abóboda 2785-521 S.Domingos de Rana Portugal Tel +35 121 448 10 36 /30 Fax +35 121 445 1082

Covidien Saglik A.S.

Maslak Mahallesi Bilim Sokak No: 5, Sun Plaza Kat: 2-3 Sisli, Istanbul 34398 Turkey Tel +90 212 366 20 00 Fax +90 212 276 35 25

Covidien Sverige AB

Box 54 171 74 Solna Sweden Tel +46 858 56 05 00 Fax + 46 858 56 05 29

Covidien Panama

Parque Industrial Costa del Esta Calle Primera, Edifio # 109 Panama City, Panama Tel: (507) 264-7337 Fax: (507) 236-7408

Covidien Puerto Rico

Palmas Industrial Park Road 869 Km 2.0 Bdlg. #1 Cataño, PR 00962 Tel. 787-993-7250 Ext. 7222 & 7221 Fax 787-993-7234

Covidien South Africa

Corporate Park North 379 Roan Crescent Randjespark Midrand, South Africa Tel +27 115 429 500 Fax +27 115 429 624

Covidien Switzerland

Roosstrasse 53 8832 Wollerau Schweiz Tel +41 44786 5050 Fax +41 44786 5010

Covidien Polska

Al. Jerozolimskie 162 Warszawa. 02-342 Polska Tel +48 223 122 130 Fax +48 223 122 020

Covidien Russia

53 bld. 5 Dubininskaya Street Moscow RUSSIA. 119054 Tel +70 495 933 64 69 Fax +70 495 933 64 68

Covidien Spain S.L.

Business Park World Trade Center Almeda Park Edificio 7 - 3ª planta Plaça de la Pau s/n Cornellà de Llobregat

Covidien Thailand

99 Soi Rubia, Sukhumvit 42 Road 13 - 14 Fl., Berli Jucker Building Prakanong, Klongtoey Bangkok 10110, Thailand Tel +662 2073 - 100 Fax +662 657 - 6325

Covidien UK

Unit 2, Talisman Business Park London Road, Bicester OX26 6HR, United Kingdom Tel +44(0)1869 328092 Fax +44(0)1869 327585

1-16 Service Manual

Covidien US

15 Hampshire Street Mansfield, MA 02048 USA Tel 1.800.635.5267 Tel 1.925.463.4635 (toll)

1.9 Related Documents

• Operator’s Manual - Covidien WarmTouch™ Convective Warming System — This

document provides instructions for operating the WarmTouch warming system in a clinical environment.

• Instructions for Use - Covidien WarmTouch™ Warming Blanket — This document,

provided with WarmTouch warming blankets, contains important information regarding intended use, handling, connection, and positioning of the blanket.

1.10 Warranty Information

To obtain warranty information, contact Covidien Technical Services or a local Covidien representative. Reference Obtaining Technical Assistance on page 1-14.

2.1 Overview

This chapter provides an introduction to the Covidien WarmTouch™ Convective Warming System, including information about its features and controls.

2.2 Product Description

The warming system provides a means for treating or preventing hypothermia in adult and pediatric patients in clinical settings. The warming system consists of an electronic blower (warming unit) that delivers heated air through a flexible hose to a lightweight blanket placed on the patient. The blanket distributes the heated air through numerous small perforations that allow the air to reach the targeted areas of the patient’s body.

2.2.1 Features

• Multiple Temperature Settings — A range of temperature settings allows the

clinician to customize and adjust treatment based on the patient’s needs.

• Boost Mode — For rapid warming, air is generated at 47°C for 45 minutes, after

which the temperature automatically drops to the 45°C (High) temperature setting.

• HEPA Filter — A High Efficiency Particulate Air (HEPA) filter removes at least

99.97% of particles 0.3 micrometers or larger from the air delivered to the warming blanket. The warming unit monitors the amount of time the filter is in use and indicates when the filter needs to be replaced.

• Automatic Over- and Under-Temperature Protection — At any of the

heated air settings, if the temperature of the generated air is out of range for a specific amount of time, the heater and fan automatically shut off and an alarm is issued.

• Optional Cart with Wheel Locks — An optional transport cart, equipped with

wheel locks, is available for the warming unit. The wheel locks reduce cart movement while the system is in use.

2-1

Product Overview

2.2.2 Indications for Use

2.2.3 Contraindications

2.2.4 Covidien WarmTouch™ Warming Blankets

The WarmTouch Convective Warming System (warming unit and blanket) is intended for prevention and treatment of hypothermia, and for the management of appropriate normothermia.

None known.

The Covidien WarmTouch™ Convective Warming Unit is designed for use with WarmTouch™ blankets only. WarmTouch blankets are designed to attach securely to the warming unit’s hose nozzle. The nozzle features guides and a clip to ensure correct orientation.

Do not attempt to use other types of blankets with the warming unit; the performance of the warming system has not been evaluated with other blankets and cannot be predicted.

The warming unit is compatible with all WarmTouch blankets.

2-2 Service Manual

2.3 Product Views

2.3.1 Front View

Product Views

Figure2-1.Front View

1 Operator’s Panel 4 Hose

2 Handle 5 Nozzle Strap with Clip

3 No Free-Hosing Label 6 Nozzle

Service Manual 2-3

Product Overview

2.3.2 Back View

Figure2-2.Back View

1 No Free-Hosing Label 5 Mounting Channel (x2)

2 Serial Number Label 6 Pole Clamp (x3)

3 Symbols Label 7 Bed Hook

4 USB Port (Under Cover) 8 Power Cord

2-4 Service Manual

2.4 Operator’s Panel

The operator’s panel includes an On/Standby key, a multi-functional keypad, and a display that provides temperature and status information. The display indicates the function of each adjacent key. Key functions change based on operating context, as described in subsequent chapters.

Figure2-3.Operator’s Panel

Operator’s Panel

4 Temperature/Information Area – Displays the current air temperature being generated

(rounded to the closest 1°C). The following symbols can also appear in this area:

On/Standby Key – Press to place the warming unit in Ready mode or to return to Standby mode. Reference Beginning Operation on page 4-4 and Returning to

Standby Mode on page 4-8.

Status LED – Indicates the warming unit’s operational status. Reference Overview

of Warming Unit Operating Modes on page 4-3.

Fan Off Key – During operation, press to turn off the fan. The heater, if running, shuts off automatically. Reference Returning to Ready Mode on page 4-7.

Dashes instead of a temperature reading indicate that the warming unit is in Ready mode (both heater and fan are off).

Animated symbol indicates that the fan is on.

Animated symbol indicates that the heater is on.

Service Manual 2-5

Product Overview

Animated arrow indicates that the temperature is adjusting upward or downward to a new setting. The symbol disappears when the temperature is within 1.5°C of the new setting.

 Note:

When you press any of the temperature setting keys, the Heat Off key, or the Fan Off key, the setting is highlighted on the display to indicate the current selection. For

example, in the previous figure, 34° is the current selection.

Menu Key – Press to access screens for viewing filter status and system information. Reference Monitoring the Filter Status on page 5-10 and Serial Number, Soft-

ware Version, and Error Codes on page 1-9.

Note: Symbol is shown for reference only. This menu is accessible only when the heater and fan are off (Ready mode).

47°C (Boost Mode) Key – Press to generate air at 47°C (116.6°F) for 45 minutes. Reference Using Boost Mode on page 4-6.

45°C (High) Key – Press to generate air at 45°C (113°F). Reference Controlling the

Temperature on page 4-5.

40°C (Medium) Key – Press to generate air at 40°C (104°F). Reference Controlling

the Temperature on page 4-5.

34°C (Low) Key – Press to generate air at 34°C (93.2°F). Reference Controlling the

Temperature on page 4-5.

Heat Off Key – Press to deliver air at room temperature (unheated). Reference

Controlling the Temperature on page 4-5.

 Note:

A soft click tone indicates a successful key press.

2-6 Service Manual

3 Installation

3.1 Overview

This chapter contains information for installing the Covidien WarmTouch™ Convective Warming Unit.

3.2 Safety Reminders

 WARNING:

No modification of this equipment is allowed. Modification can result in death, injury, or property damage.

3-1

Installation

3.3 Attaching the Power Cord

The warming unit is shipped with a power cord appropriate to the country of use.

To attach the power cord:

1. Position the warming unit on its front so the bottom of the unit is accessible

(Figure 3-2).

Figure3-1.Positioning the Unit for Power Cord Installation

1 Power Cord Routing Bracket 2 Power Cord Socket

2. Insert the power cord into the socket on the warming unit, making sure that it is

fully seated.

Note: Do not route the power cord through the metal hook on the filter enclosure.

3. Press the power cord into the routing bracket until it is completely seated

(Figure 3-2). If necessary, use a screwdriver to carefully spread the sides of the bracket while inserting the cord.

3-2 Service Manual

Figure3-2.Power Cord Connection

Attaching the Power Cord

4. Set the warming unit upright. Wrap the power cord around the back of the unit,

and secure it with the attached strap (Figure 3-3).

Service Manual 3-3

Installation

Figure3-3.Power Cord Wrapped and Secured

3-4 Service Manual

3.4 Installing the Warming Unit

The warming unit can be used as a standalone device, or it can be mounted on an IV pole, bed, or optional transport cart. The following sections provide mounting instructions.

3.4.1 IV Pole Installation

The warming unit can be mounted on an IV pole with a maximum diameter of

3.2 cm (1.25 inches) and a minimum diameter of 1.9 cm (0.75 inches). To avoid tipping, the warming unit must be mounted on the pole with the

handle no higher than 76 cm (30 inches) above the floor.

Requirements:

• Measuring tape

Installing the Warming Unit

To install the warming unit on an IV pole:

1. On the IV pole, mark the maximum mounting height. The warming unit’s handle

must be no higher than 76 cm (30 inches) above the floor.

2. Ensure that the power cord is secured at the back of the warming unit. Reference

Figure 3-4 on page 3-6.

3. Locate the mounting channel with two clamps at the back of the warming unit.

Do not use the mounting channel with one clamp. Reference Figure 3-4 on page 3-6.

4. Loosen the knobs on the two clamps and rotate the clamp feet away from the

mounting channel.

Service Manual 3-5

Installation

Figure3-4.Back View

1 Mounting Channel 3 Clamp Knob (x2)

2 Clamp Foot (x2)

5. Bracing the IV pole, position the warming unit against the pole so that the pole is

fully seated in the mounting channel. Verify that the handle is not

above the

maximum height.Reference Figure 3-5 on page 3-7.

6. Rotate the two clamp feet across the IV pole, and tighten the clamp knobs to

secure the warming unit. Do not overtighten.

3-6 Service Manual

Figure3-5.Warming Unit Mounted on IV Pole

Installing the Warming Unit

Service Manual 3-7

Installation

3.4.2 Bed Installation

The warming unit can be attached to a bed that has a mounting surface up to

3.6 cm (1.4 inches) wide. Typically, the unit is attached to the bed’s head board or foot board.

To attach the warming unit to a bed:

1. Locate the bed hook on the back of the warming unit. Reference Figure 2-2 on

page 2-4. The hook slides in and out to accommodate different mounting surface widths.

2. Hang the bed hook over the mounting surface to attach the warming unit to the

bed.

Figure3-6.Bed Installation

3-8 Service Manual

3.4.3 Cart Installation

An optional transport cart is available for the warming unit. Contact Covidien Technical Services or a local Covidien representative to purchase the transport cart. Reference Obtaining Technical Assistance on page 1-14.

To install the warming unit on the cart:

1. Ensure that the power cord is secured at the back of the warming unit. Reference

Figure 3-7.

2. Loosen the knobs on the three clamps at the back of the warming unit, and rotate

the clamp feet away from the mounting channels.

Figure3-7.Back View

Installing the Warming Unit

1 Mounting Channel (x2) 3 Clamp Foot (x3)

2 Clamp Knob (x3)

Service Manual 3-9

Installation

3. Locate the mounting pegs on the cart’s vertical poles, and locate the holes at the

bottom of the warming unit’s mounting channels.

Figure3-8.Cart Mounting Peg and Warming Unit Mounting Hole

1 Mounting Channel (x2) 3 Mounting Peg (x2)

2 Mounting Hole (x2)

4. Holding the warming unit by the handle and bracing the cart, position the

warming unit against the cart so that the mounting holes engage the mounting pegs. The cart poles must be fully seated in the mounting channels.

5. Rotate each of the three clamp feet across the cart poles, and tighten the clamp

knobs to secure the warming unit. Do not overtighten.

3-10 Service Manual

Figure3-9.Warming Unit Mounted on Cart

Installing the Warming Unit

Service Manual 3-11

Installation

Page Left Intentionally Blank

3-12 Service Manual

4 Operation

4.1 Overview

This chapter provides basic operating instructions for the Covidien WarmTouch™ Convective Warming Unit. Full instructions for operating the unit in a clinical setting are provided in the Covidien WarmTouch™ Convective Warming System Operator’s Manual. Clinicians intending to use the warming system for treatment of patients must consult the Operator’s Manual.

Applying Power Page 4-2

Overview of Warming Unit Operating Modes Page 4-3

Beginning Operation Page 4-4

Controlling the Temperature Page 4-5

Powering Off the Warming Unit Page 4-8

4.2 Safety Reminder

 WARNING:

4-1

Operation

4.3 Applying Power

 WARNING:

Possible electric shock hazard. Grounding reliability can be achieved only when the warming unit is connected to a suitable mains outlet with protective earth grounding.

To apply power to the warming unit:

1. Locate a hospital-grade or suitable mains outlet with protective earth grounding.

Ensure that the power outlet is easily accessible; disconnection from the outlet is the only way to completely remove power from the warming unit.

2. Plug the warming unit’s power cord into the outlet. The status LED illuminates

amber to indicate that the warming unit is in Standby mode. The fan and heater are off, and the display is blank.

4-2 Service Manual

Overview of Warming Unit Operating Modes

4.4 Overview of Warming Unit Operating Modes

Standby Mode

• Status LED: AMBER

• Heater: OFF

• Fan: OFF

• Display: OFF

Ready Mode

• Status LED: GREEN

• Heater: OFF

• Fan: OFF

• Display: ON

Treatment Mode

• Status LED: GREEN

• Heater: ON or OFF

• Fan: ON

• Display: ON

See Operator’s Panel on page 2-5 for descriptions of the display symbols.

1 On/Standby Key — Press to place the unit in Ready mode and prepare for

operation, or press to return to Standby mode when treatment is complete. See Beginning Operation on page 4-4 and Returning to Standby Mode on page 4-8.

2 Temperature Keys — Press to place the unit in Treatment mode, delivering

air to the blanket. See Controlling the Temperature on page 4-5.

3 Fan Off Key — Press to return to Ready mode, pausing air delivery. See

Returning to Ready Mode on page 4-7.

Service Manual 4-3

Operation

4.5 Beginning Operation

To begin operation:

1. Press the On/Standby key. The unit enters Ready mode:

• The status LED turns green, and the display turns on.

• A short tone indicates a successful power-on self-test (POST). If POST is unsuc-

cessful, an alarm screen appears. See Alarms on page 6-12.

• The Main screen appears (Figure 4-1). Note that if the filter needs to be

replaced, the Replace Filter screen appears instead of the Main screen (Figure 4-2).

Figure4-1.Main Screen at Power-On

Figure4-2.Replace Filter Screen at Power-On

2. If you see the Replace Filter screen, follow the procedure Filter Replacement on

page 5-4. It is possible to continue operation; however, failure to replace the filter

4-4 Service Manual

as recommended can adversely affect device performance. If you choose to continue operation, press the OK key. The Main screen appears (Figure 4-1). Until the filter is replaced, the Replace Filter screen reappears at each subsequent poweron.

4.6 Controlling the Temperature

 Note:

During patient treatment, a WarmTouch™ warming blanket must be attached to the warming unit at all times.

Select a setting by pressing one of the temperature keys. Change the setting as desired.

Note that the temperature settings and readings on the display correspond to internal measurements of the air entering the hose. The air temperature entering the blanket is lower and can vary depending on environmental conditions. Use Table 4-1 as a guideline for selecting temperature settings.

Controlling the Temperature

Setting Avg. Temperature

Entering Hose

Room temperature Room temperature To aid in cooling the patient, if

(Heat Off)

34°C (93°F) 32°C (90°F) To help prevent or treat hypo-

(Low)

40°C (104°F) 38°C (100°F)

(Medium)

45°C (113°F) 42°C (108°F)

(High)

47°C (117°F) for 45

(Boost)

minutes

Table4-1.Temperature Settings

Avg. Temperature

Entering Blanket

44°C (111°F) To rapidly warm patients.

Typical Use

necessary.

thermia, or to maintain appropriate normothermia.

Service Manual 4-5

Operation

Figure4-3.Warming System Set to 40°C (Medium)

Note that when you change the temperature setting, an amber arrow appears next to the current temperature while it adjusts. When the temperature is within approximately 1.5°C of the new setting, the arrow disappears.

4.6.1 Using Boost Mode

Boost mode allows rapid warming of patients. Air is generated at 47°C (116.6°F) for 45 minutes. After 45 minutes, the setting automatically changes to 45°C (High).

To use Boost mode, press the 47°C (Boost Mode) key. A countdown timer shows the time remaining before the temperature switches to the 45°C (High) setting. Boost mode sessions can be repeated as necessary.

Figure4-4.Warming System Set to Boost Mode

4-6 Service Manual

4.6.2 Using the Heat Off Setting

The heat off setting provides a means to cool a patient. To use the heat off setting, press the Heat Off key. Air is delivered to the warming blanket at room temperature (heater off).

Figure4-5.Warming System Set to Heat Off

Controlling the Temperature

4.6.3 Returning to Ready Mode

During operation, you can switch back to Ready mode (fan and heat off) any time you do not need to apply air to the warming blanket. The display stays on, and the unit remains ready to operate.

To return to Ready mode, press the Fan Off key. Note that in Ready mode, the temperature reading shows dashes.

Figure4-6.Warming System Set to Ready Mode

Service Manual 4-7

Operation

4.6.4 Returning to Standby Mode

Use Standby mode when you are finished using the warming system but do not wish to unplug it.

To return to Standby mode during operation, press the On/Standby key. The heater and fan shut off, the display goes blank, and the status LED turns amber.

4.6.5 If Power is Interrupted...

If power is interrupted during operation, the warming unit responds as follows, based on the duration of the power loss:

• Power restored within approximately 15 seconds — The warming unit

powers up, performs a power-on self-test (POST), and resumes operation in the same mode as before the power loss.

• Power restored after approximately 15 seconds — The warming unit

powers up in Standby mode.

If the warming unit powers back up in Standby mode, press the On/Standby key to enter Ready mode, then select a temperature setting to resume operation.

4.7 Powering Off the Warming Unit

To power off the warming unit:

1. Press the On/Standby key. The fan and heater (if running at the time) turn off.

The display goes blank, and the status LED turns amber.

2. To completely remove power from the warming unit, unplug the unit’s power

cord from the outlet.

4-8 Service Manual

5 Maintenance

5.1 Overview

This chapter describes the cleaning and maintenance requirements for the Covidien WarmTouch™ Convective Warming Unit.

Cleaning the Warming Unit Page 5-2

Safety Checks Page 5-3

Filter Replacement Page 5-4

Monitoring the Filter Status Page 5-10

5.2 Safety Reminders

 WARNING:

Before attempting to open or disassemble the warming unit, disconnect the power cord from the AC power source.

 Caution:

Observe ESD (electrostatic discharge) precautions when servicing the warming unit.

5-1

Maintenance

 WARNING:  WARNING:

 Caution:

5.3 Cleaning the Warming Unit

Clean the warming unit after each use, as described in this manual.

Disconnect the warming unit's power cord from the AC power source before performing this procedure.

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 disinfection of the warming unit, follow your institution's procedures or the recommended actions below:

• Surface cleaning — Use a soft cloth dampened with either a commercial, non-

abrasive 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.

5-2 Service Manual

5.4 Safety Checks

5.4.1 Physical Inspection

Covidien recommends that the customer perform a visual check of the following items before each use of the warming unit:

• Equipment — Inspect the warming unit and power cord for mechanical damage

or deterioration.

• Labels — Inspect the safety labels for legibility.

After performing any service on the warming unit, be sure to check these items before returning the unit to operation.

Covidien also recommends checking the time remaining time before the filter must be replaced before returning the unit to operation. See Monitoring the

Filter Status on page 5-10 for instructions.

Safety Checks

5.4.2 Temperature and Alarm Verification

Once a year, the following tests must be performed:

• Temperature Accuracy Test — Use this test to verify heater output tempera-

tures. See page 7-8 for instructions.

• Thermostat Test — Use this test to verify the alarm system. See page 7-11 for

instructions.

These tests are also required after certain service procedures. Refer to the instructions in each component replacement section for testing requirements.

5.4.3 Electrical Safety Tests

The following electrical safety tests must be performed after certain service procedures:

• Ground Bond Test — See page 7-14 for values.

• Earth Leakage Current Test (Line Leakage) — See page 7-14 for values.

• Enclosure Leakage Current Test (Line Leakage) — See page 7-14 for values.

Refer to the instructions in each component replacement section for testing requirements.

Service Manual 5-3

Maintenance

 WARNING:  WARNING:

 Caution:

5.5 Filter Replacement

Do not operate the warming unit with the filter enclosure removed.

Disconnect the warming unit's power cord from the AC power source before performing this procedure.

The HEPA filter must whichever comes first.

be replaced every 2,000 hours of operation or 365 days,

 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.

The warming unit contains a HEPA filter that must be replaced at regular intervals. When the filter needs to be replaced, the screen shown in Figure 5-1 appears at each power-on. Failure to replace the filter as recommended

can adversely affect device performance.

Figure5-1.Replace Filter Screen

5-4 Service Manual

Requirements:

• WT HEPA Filter Kit (page A-7)

• Torque driver with #2 Phillips bit

• 70% isopropyl alcohol solution and soft cloth (if replacing gasket in filter enclo-

sure)

To replace the filter:

1. If the power cord is secured around the back of the unit, unwind it completely.

2. Position the warming unit on its front so the bottom of the unit is accessible

(Figure 5-2).

Figure5-2.Filter Enclosure and Power Cord Connection

Filter Replacement

1 Filter Enclosure 3 Power Cord Routing Bracket

2 Filter Enclosure Screws (x3) 4 Power Cord Connector

Service Manual 5-5

Maintenance

 Caution:

3. Remove the three screws from the filter enclosure. Lift the enclosure away from

the unit, disengaging the power cord from its socket. Set the enclosure and attached power cord aside.

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.

4. Remove the filter (Figure 5-3). Dispose of the filter as required by local governing

ordinances.

Figure5-3.HEPA Filter

5. Place the new filter on the unit.

5-6 Service Manual

6. Before placing the filter enclosure back on the unit, check the circular gasket

inside the enclosure (Figure 5-4). If the gasket is worn or damaged, replace it as follows:

a. Peel the gasket off the enclosure. b. Use a soft cloth dampened with a solution of 70% isopropyl alcohol to

remove any adhesive remnants from the surface. Make sure that the surface is completely dry before proceeding.

c. Remove the backing from the new gasket to expose the adhesive. d. Center the gasket around the raised area in the enclosure, and press around

the entire gasket to adhere.

Figure5-4.Gasket inside Filter Enclosure

Filter Replacement

7. Place the filter enclosure back on the unit, aligning the power cord with its socket.

Make sure that the enclosure is fully seated on the unit.

8. Press the power cord connector into the socket so that it is fully connected

(Figure 5-2 on page 5-5).

9. Reinstall the three screws in the filter enclosure. Tighten the screws to 1.2 to 1.6

N-m (10.6 to 14.2 lb-in).

Service Manual 5-7

Maintenance

10. Set the unit upright, and plug the power cord into the power outlet.

11. Reset the filter counters as follows:

a. Press the On/Standby key. The Replace Filter screen appears (Figure 5-5).

Figure5-5.Replace Filter Screen

b. Press the Replace Filter key. The Filter Information screen appears (Figure 5-

6).

Figure5-6.Filter Information Screen - Filter Expired

c. Press the Filter Reset key. d. Press the key code as described in Service Screen Access on page 7-2. The filter

counters are reset to 365 days and 2000 hours.

e. Press the On/Standby key to return to Standby mode. Press the On/Standby

key again and verify that the Main screen appears (Figure 5-7) rather than the Replace Filter screen.

5-8 Service Manual

Figure5-7.Main Screen at Power-On

12. Power off the warming unit by pressing the On/Standby key. Disconnect the

power cord from the outlet.

13. Wrap the power cord around the back of the unit, and secure it with the attached

strap (Figure 5-8).

Filter Replacement

Figure5-8.Power Cord Wrapped and Secured

Service Manual 5-9

Maintenance

 Note:

5.6 Monitoring the Filter Status

The warming unit monitors filter usage and provides counters that indicate the number of operating hours and days until the filter needs to be replaced. You can anticipate filter replacement by checking the counters on the Filter Information screen.

The Filter Information screen is only accessible when the warming unit is in Ready mode. It is not accessible while the warming unit is operating.

To view the Filter Information screen:

1. If the warming unit is not already powered on, follow the steps in Applying Power

on page 4-2.

2. Press the On/Standby key to enter Ready mode.

3. Press the Menu key on the Main screen. The Menu screen appears (Figure 5-9).

Figure5-9.Menu Screen

4. Press the Filter Information key. The Filter Information screen indicates the days

and operating hours remaining before the filter needs to be replaced (Figure 5-

10).

5-10 Service Manual

Figure5-10.Filter Information Screen

1 Filter Days Remaining 2 Filter Hours Remaining

Monitoring the Filter Status

5. To return to the Main screen, press the Exit key twice.

Service Manual 5-11

Maintenance

Page Left Intentionally Blank

5-12 Service Manual

6 Troubleshooting

6.1 Overview

This chapter provides information for troubleshooting problems that may occur with the Covidien WarmTouch™ Convective Warming Unit.

Principles of Operation Page 6-2

Basic Troubleshooting Page 6-9

Alarms Page 6-12

6.2 Safety Reminders

 WARNING:

No modification of this equipment is allowed. Modification can result in death, injury, or property damage.

 Caution:

Electromagnetic Compatibility (EMC) on page 13-4 for additional guidance.

6-1

Troubleshooting

6.3 Principles of Operation

6.3.1 Overview

The Covidien WarmTouch™ Convective Warming System provides clinicians with a means to supply warmed or room temperature air to the skin surface of patients to achieve and maintain normothermia. The system consists of the Covidien WarmTouch™ Convective Warming Unit and specially designed blankets to distribute the air.

The warming unit is powered from wall outlet AC power through an internal power supply that maintains a consistent output across a range of input voltages and frequencies. Users interact with the unit via a set of hardware keys arranged around a software-controlled Graphical User Interface (GUI).

The warming unit produces air output by drawing room air through a High Efficiency Particulate Air (HEPA) filter, across a heating element, and into an electrically-operated fan. The fan outputs the air across a control thermistor at the base of the hose. The temperature of the air is monitored by a hardware circuit under software control that provides power to the heating element to regulate the temperature for the heated air settings. The heated air is delivered to the output hose where the nozzle connects distally to the blanket, resulting in air delivery to the patient.

The delivered air temperature is constantly monitored by the warming unit’s microprocessors. If the temperature does not stay within specification, the unit shuts down the heating element and the fan. A safety thermostat provides additional protection by shutting down the heating element and fan if the

heated air temperature exceeds its operating limit.

6-2 Service Manual

6.3.2 Block Diagram

Figure 6-1 shows the relationship between the major components in the

warming unit. Descriptions of the components and their interactions follow. A detailed diagram of the cable connections between the components is provided on page 6-8.

Figure6-1.Warming Unit Block Diagram

Principles of Operation

Service Manual 6-3

Troubleshooting

6.3.3 Component Descriptions

Display

The unit uses a 2.5”, QVGA (320 x 240) TFT liquid crystal display (LCD) to relay status and provide interactive information to the user. The display is located inside the unit’s front enclosure behind the UI PCBA (see Figure 10-7 on page 10-8). The display is controlled by the UI microprocessor on the UI PCBA and connects to the PCBA via a cable that is fixed to the display.

Keypad

The keypad on the front of the unit consists of an On/Standby key and seven multifunction control keys. The On/Standby key switches the unit between Standby mode and Ready mode (see Overview of Warming Unit Operating

Modes on page 4-3). The control keys perform a variety of functions depend-

ing on operating context. The keypad is built into the die-cut panel that attaches to the unit’s front enclo-

sure. The panel includes an LED that indicates warming unit status:

• Green for operating modes

• Amber for standby mode

• Off when disconnected from power

The keypad connects to the UI PCBA via a fixed cable that is routed into the unit through a slot below the panel (see Figure 10-4 on page 10-6).

USB Port

To facilitate software updates, error log downloads, and other service tasks performed at Covidien Service Centers, the warming unit can communicate with a computer via its USB interface. The USB port is located under a protective cover at the back of the unit (see Figure 10-18 on page 10-23). An internal USB cable connects the port to the UI PCBA (see Figure 10-17 on page 10-22).

6-4 Service Manual

Principles of Operation

Speaker

The unit’s speaker is located inside the front enclosure (see Figure 10-27 on page 10-37). The speaker generates alert tones (such as when POST passes), alarm tones, and key clicks. It is connected to and driven by the power PCBA. There is no external speaker opening.

UI PCBA

The UI PCBA is located inside the front enclosure below the operator’s panel (see Figure 10-10 on page 10-12). It contains the UI microprocessor which is responsible for all user interface functions. The UI microprocessor displays information and menus on the LCD and receives user input from the keypad. It sends commands based on the input to the A/D microprocessor on the power PCBA which controls the unit’s power, fan, and heating functions.

The UI PCBA also contains a real-time clock (RTC) that allows filter use to be tracked and log/code entries to be time-stamped. The replaceable battery for the RTC is located on the UI PCBA.

The USB connector on the UI PCBA supports software updates, error log downloads, and other service functions performed at Covidien Service Centers.

Power PCBA

The power PCBA is located inside the front enclosure (see Figure 10-24 on page 10-31). It contains the A/D microprocessor and control circuitry for the fan, heater, and thermostat.

The power PCBA has power input connections from the AC power inlet and power supply, and output connections to the heater, fan, thermostat, and speaker. The power PCBA converts the 48VDC output from the power supply to various voltages required to power components throughout the system. The power circuits are protected by redundant fuses located on the PCBA.

The A/D microprocessor maintains a communication channel with the UI microprocessor and controls power to the UI PCBA and display. It also receives input from the thermistor and relays that input to the UI microprocessor which displays the temperature readings on the LCD.

Service Manual 6-5

Troubleshooting

Power Supply

The power supply is located inside the front enclosure (Figure 10-31 on page 10-43). It is an internally-fused AC/DC converter delivering 48VDC, 65W output from an input range of 90-264VAC. It has an input connection from the AC power inlet, an output connection to the power PCBA, and a ground connection to the equipotential stud. The 48V output from the power supply is converted to 12V, 5V, 3.3V, and 2.5V on the power PCBA to drive various system components.

HEPA Filter

The HEPA filter is located inside the filter enclosure at the back of the unit (see

Figure 5-3 on page 5-6). The fan draws air into the filter through the opening

at the base of the filter enclosure prior to delivering the air across the heating element.

The filter must be replaced every 2,000 hours of operation or 365 days, whichever comes first. Software counters track the number of power-on hours and calendar days since the previous filter change. These counters rely on the realtime clock (RTC) located on the UI PCBA.

When the filter needs to be replaced based on either of the counters, the user is notified at power-on. The counters can be reset using a key code at the keypad when the filter is replaced.

Heater

The heater is located below the fan assembly inside the rear enclosure (see

Figure 11-40 on page 11-43). The heater consists of a wire-wound element

that generates heat when current (90-264VAC) is passed through it. The heater connects to the power PCBA and is controlled by the A/D microprocessor based on user input and thermistor feedback.

Fan

The fan is located inside the rear enclosure (see Figure 11-30 on page 11-33). It is powered by 48VDC from the power PCBA. Fan speed is monitored by the A/D microprocessor and is voltage-controlled via circuitry on the PCBA. If the speed is too low or too high, the software shuts down the fan and heater and generates an alarm.

6-6 Service Manual

Principles of Operation

Thermostat

The thermostat is located in the hose duct adapter near the base of the hose (see Figure 11-9 on page 11-10). It is connected to the power PCBA. The thermostat provides thermal cut-out protection by opening at 49°C to 55°C (120°F to 131°F), resulting in heater and fan shutdown.

Thermistor

The thermistor is located in the hose duct adapter just below the screen at the base of the hose (see Figure 11-2 on page 11-4 and Figure 11-6 on page 11-7). It is connected to the power PCBA.

During operation, the temperature measured by the thermistor is monitored by the A/D processor and relayed to the UI microprocessor for display on the LCD. If the temperature does not remain within specification, the software shuts down the heater and fan and generates an alarm.

Service Manual 6-7

Troubleshooting

6.3.4 Component Cable Connections

Figure6-2.Cable Connections Between Major Components

6-8 Service Manual

6.4 Basic Troubleshooting

Table6-1.Warming Unit Problems and Resolutions

Problem Resolution

Basic Troubleshooting

Low-priority alarm

Medium-priority alarm

(flashing)

Failure to power on (LED not turning on)

See Alarms on page 6-12.

• Check the power cord’s connection to the warming unit. The

connector must be fully seated (page 3-2).

• Try a different power cord (page 8-5).

• Check the cable connections between the AC power inlet and

the power supply, power PCBA, and equipotential stud (page 10-51).

• Check the fuses on the power PCBA (page 10-35).

• Check the ribbon cable connection between the power PCBA

and the UI PCBA (page 10-19).

• Check the keypad cable connection to the UI PCBA (page 10-3).

• Try replacing components in the following order:

1. Ribbon cable (page 10-19).

2. Power supply output cable (page 10-46).

3. AC power inlet (page 10-51).

4. Power supply (page 10-43).

5. Power PCBA (page 10-31).

6. UI PCBA (page 10-12).

7. Keypad (page 10-3).

Power-on self-test (POST) failure

Check the error codes on the System Information screen (page 1-9), and perform recommended corrective actions (page B-1).

Service Manual 6-9

Troubleshooting

Table6-1.Warming Unit Problems and Resolutions (Continued)

Problem Resolution

Display not working • Make sure that the On/Standby key has been pressed and the

status LED is green. (If the status LED is amber, the display is blank.)

• Check the display cable connection to the UI PCBA (page 10-8).

• Try replacing components in the following order:

1. Display (page 10-8).

2. UI PCBA (page 10-12).

Display test failure (bad pixels or incorrect colors)

Key(s) not working on keypad

Keypad test failure

Speaker not working

Fan not operating

• Check the display cable connection to the UI PCBA (page 10-8).

• Try replacing components in the following order:

1. Display (page 10-8).

2. UI PCBA (page 10-12).

• Check the keypad cable connection to the UI PCBA (page 10-3).

• Try replacing components in the following order:

1. UI PCBA (page 10-12).

2. Keypad (page 10-3).

• Check the speaker cable connection to the power PCBA and to

the two terminals on the speaker. Make sure the wires are on the correct terminals (red to positive; black to negative) (page 10-40).

• Try replacing components in the following order:

1. Speaker cable (page 10-40).

2. Speaker (page 10-37).

3. Power PCBA (page 10-31).

• Check the error codes on the System Information screen

(page 1-9), and perform recommended corrective actions (page B-1).

• Check the fan cable connection to the power PCBA

(page 10-31).

• Try replacing components in the following order:

1. Fan (page 11-33).

2. Power PCBA (page 10-31).

Flow test failure (fan speed out of range)

• Check the fan cable connection to the power PCBA

(page 10-31).

• Try replacing components in the following order:

1. Power PCBA (page 10-31).

2. Fan (page 11-33).

6-10 Service Manual

Table6-1.Warming Unit Problems and Resolutions (Continued)

Problem Resolution

Heater not operating • Check the error codes on the System Information screen

(page 1-9), and perform recommended corrective actions (page B-1).

• Check the heater cable connection to the power PCBA

(page 10-31).

• Try replacing components in the following order:

1. Heater (page 11-43).

2. Power PCBA (page 10-31).

Basic Troubleshooting

Thermostat test failure (thermostat fails to open)

Temperature accuracy test failure (output air temperature not within specification)

• Check the error codes on the System Information screen

(page 1-9), and perform recommended corrective actions (page B-1).

• Check the thermostat cable connection to the power PCBA and

to the thermostat terminals (page 11-14).

• Try replacing components in the following order:

1. Thermostat (page 11-9).

2. Power PCBA (page 10-31).

3. Thermostat cable (page 11-14).

• Check the error codes on the System Information screen

(page 1-9), and perform recommended corrective actions (page B-1).

• Check the thermistor cable connection to the power PCBA

(page 11-3).

• Make sure that the thermistor wire and rivet are correctly

attached to the hose duct adapter (page 11-4).

• Check the heater cable connection to the power PCBA

(page 10-31).

• Try replacing components in the following order:

1. Thermistor sensor assembly (page 11-3).

2. Power PCBA (page 10-31).

Electromagnetic interference between the warming unit and other devices

• Check the error codes on the System Information screen

(page 1-9), and perform recommended corrective actions (page B-1).

• Advise the customer to try increasing the distance between

devices, repositioning the cabling, or plugging the devices into separate outlet circuit branches. See Electromagnetic Compati-

bility (EMC) on page 13-4 for additional guidance.

Service Manual 6-11

Troubleshooting

6.5 Alarms

If an alarm condition or error occurs during operation, the warming unit sounds alarm tones and displays an alarm screen. There are two types of alarms: low-priority and medium-priority.

Figure6-3.Low-Priority Alarm (Left) and Medium-Priority Alarm (Right)

 Note:

If multiple alarms occur at the same time, the unit reports the highest priority alarm.

Table6-2.Alarm Indicators

Symbol Tones Type of Alarm

Two successive tones

repeating

Three successive tones

repeating at decreasing

intervals

(flashing)

Low-priority alarm: A condition that requires operator awareness.

Medium-priority alarm: A condition that requires prompt operator response.

6-12 Service Manual

To troubleshoot an alarm:

1. If the alarm is currently indicated on the unit’s display, try clearing the alarm as

follows:

a. Power off the warming unit by pressing the key indicated on the alarm screen. b. Press the On/Standby key to power the warming unit back on.

Note: While a low-priority alarm may be cleared this way, a medium-priority alarm typically will not be cleared.

2. If possible, check the error codes on the System Information screen (see Serial

Number, Software Version, and Error Codes on page 1-9). Perform the repair(s)

listed for the error code(s) (see Error Codes and Suggested Resolutions on page B-2).

Alarms

Service Manual 6-13

Troubleshooting

Page Left Intentionally Blank

6-14 Service Manual

7 Performance Verification

7.1 Overview

This chapter provides instructions for testing the Covidien WarmTouch™ Convective Warming Unit after repair. Testing is required after most service procedures. Refer to the instructions in each component replacement section for minimum testing requirements.

Required Test Equipment Page 7-2

Service Screen Access Page 7-2

Performance Tests Page 7-3

Electrical Safety Tests Page 7-14

7.2 Safety Reminders

 WARNING:

Possible electric shock hazard. Grounding reliability can be achieved only when the warming unit is connected to a suitable mains outlet with protective earth grounding.

 Caution:

Observe ESD (electrostatic discharge) precautions when servicing the warming unit.

7-1

Performance Verification

7.3 Required Test Equipment

• Temperature probe (either handheld meter or USB-based):

– Accuracy of probe must be ±0.25°C or better over the range 10°C to 60°C.

– Probe cable must be long enough to reach from computer to hose duct

• Electrical leakage tester

• Ground bond tester

7.4 Service Screen Access

adapter screen inside compressed hose.

The warming unit provides screens for performing functions restricted to service personnel. These screens are protected by a key code.

When you see the message “Enter Key Code” press the keys indicated in

Figure 7-1 simultaneously to access these screens.

Figure7-1.Key Code Screen

7-2 Service Manual

7.5 Performance Tests

Power-On Test Page 7-3

Keypad Test Page 7-5

Display Test Page 7-7

Temperature Accuracy Test Page 7-8

Flow Test Page 7-10

Thermostat Test Page 7-11

 Note:

A test data sheet that can be used to record test results is provided on page C-2.

Performance Tests

7.5.1 Power-On Test

Use the power-on test to confirm basic functionality of the unit.

To perform the power-on test:

1. Plug the warming unit’s power cord into the outlet, and press the On/Standby

key.

2. Verify that the unit passes its power-on self-test (POST) and enters Ready mode:

• The status LED turns green, and the display turns on.

• A short tone sounds, indicating a successful POST. If POST is unsuccessful, an

alarm screen appears (see Alarms on page 6-12).

• The Main screen appears (Figure 7-2). Note that if the filter needs to be

replaced, the Replace Filter screen appears instead of the Main screen (Figure 7-3). If you see the Replace Filter screen, press the OK key to proceed to the Main screen. (The filter must be replaced before placing the unit back in operation. Refer to Filter Replacement on page 5-4.)

Service Manual 7-3

Performance Verification

Figure7-2.Main Screen at Power-On

Figure7-3.Replace Filter Screen at Power-On

3. Press one of the temperature keys. Verify that the temperature reading on the

screen rises and stabilizes.

4. When finished with all testing:

a. Press the On/Standby key to power off the unit. b. Unplug the unit from the outlet.

Power-On Test Failure

If the test fails, see Basic Troubleshooting on page 6-9.

7-4 Service Manual

7.5.2 Keypad Test

Use the keypad test to confirm that each key is functioning and that the unit responds as expected.

To perform the keypad test:

1. Perform steps 1 and 2 of the power-on test (page 7-3).

2. Press and verify each key:

Key Expected Behavior of Unit

Temperature reading on Main screen rises and stabilizes. Reading corresponds to key pressed.

Performance Tests

(Heat Off)

(Fan Off)

(Menu)

Unit delivers air at room temperature:

- Heater: OFF

- Fan: ON

- Status LED: GREEN

Unit returns to Ready mode:

- Heater: OFF

- Fan: OFF

- Status LED: GREEN

Menu screen appears:

Service Manual 7-5

Performance Verification

Key Expected Behavior of Unit

Main screen appears:

(Exit)

Unit powers off:

- Display: OFF

(On/Standby)

- Status LED: AMBER

3. When finished with all testing, unplug the unit from the outlet.

Keypad Test Failure

If the test fails, see Basic Troubleshooting on page 6-9.

7-6 Service Manual

7.5.3 Display Test

Use the display test to confirm that there are no bad pixels.

To perform the display test:

1. Plug the warming unit’s power cord into the outlet, and press the On/Standby

key.

2. Verify that the initial display screen is lighted white and has no vertical or

horizontal black or colored rows.

3. When finished with all testing:

a. Press the On/Standby key to power off the unit. b. Unplug the unit from the outlet.

Performance Tests

Display Test Failure

If the test fails, see Basic Troubleshooting on page 6-9.

Service Manual 7-7

Performance Verification

7.5.4 Temperature Accuracy Test

Use the temperature accuracy test to verify that the unit’s output air temperature is within specification.

Requirements:

• Temperature probe (see page 7-2).

To perform the temperature accuracy test:

1. Perform steps 1 and 2 of the power-on test (page 7-3).

2. Fully compress the warming unit’s hose and position it vertically, nozzle facing up

(Figure 7-4).

Figure7-4.Position of Hose for Temperature Accuracy Test

7-8 Service Manual

3. Lower the temperature probe into the hose until it contacts the metal screen at

the base of the hose duct adapter. The probe should be approximately centered on the screen.

4. Test the 34°C setting:

a. Press the 34°C key. Allow the temperature to stabilize for at least 3 minutes. b. Confirm that the temperature measured by the probe is within 1°C of the

temperature setting.

5. Test the 47°C setting:

a. Press the 47°C key. Allow the temperature to stabilize for at least 3 minutes. b. Confirm that the temperature measured by the probe is within 1°C of the

temperature setting.

6. Remove the temperature probe from the unit.

Performance Tests

7. When finished with all testing:

a. Press the On/Standby key to power off the unit. b. Unplug the unit from the outlet.

Temperature Accuracy Test Failure

If the test fails, see Basic Troubleshooting on page 6-9.

Service Manual 7-9

Performance Verification

7.5.5 Flow Test

Use the flow test to confirm fan functionality.

To perform the flow test:

1. Position the hose on the nozzle hook with the hose compressed as much as pos-

sible (Figure 7-5).

Figure7-5.Position of Hose for Flow Test

2. Perform steps 1 and 2 of the power-on test (page 7-3).

3. Press the 34°C key. The fan should ramp up to operating speed and air should

flow from the nozzle. Confirm that no alarms occur.

4. When finished with all testing:

a. Press the On/Standby key to power off the unit. b. Unplug the unit from the outlet.

Flow Test Failure

If the test fails, see Basic Troubleshooting on page 6-9.

7-10 Service Manual

7.5.6 Thermostat Test

Use the thermostat test to verify that the thermostat opens when an over-temperature condition occurs and that an audible and visual alarm is generated.

To perform the thermostat test:

1. Perform steps 1 and 2 of the power-on test (page 7-3).

2. Press the Menu key on the Main screen. The Menu screen appears (Figure 7-6).

Figure7-6.Menu Screen

Performance Tests

3. Press the System Test key. The Key Code screen appears (Figure 7-7).

Figure7-7.Key Code Screen

Service Manual 7-11

Performance Verification

4. Press the key code as described in Service Screen Access on page 7-2. The Select

Test screen appears (Figure 7-8).

Figure7-8.Select Test Screen

5. Press the Test Thermostat key to begin the thermostat test. The Thermostat Test

screen appears (Figure 7-9).

Figure7-9.Thermostat Test Screen

6. Verify that within 1-2 minutes, the heater and fan shut down and an alarm is gen-

erated. (It is not necessary to time the process, however, if the thermostat fails to open, see Thermostat Test Failure on page 7-13.)

7. Press the On/Standby key to power off the unit. Allow the unit to cool 5 -10 min-

utes, then power it back on.

8. Press the Menu key. The Menu screen appears.

7-12 Service Manual

9. Press the System Information key. The System Information screen shows the

most recent error messages. Look for error code 006, indicating that the thermal cut-out switch opened.

10. When finished with all testing:

a. Press the On/Standby key to power off the unit. b. Unplug the unit from the outlet.

Thermostat Test Failure

If the thermostat fails to open within 20 minutes after the thermostat test begins, the heater and fan automatically shut down. The following message appears on the display:

Thermostat Test Failed. Consult Service Manual

If the test fails, see Basic Troubleshooting on page 6-9.

Performance Tests

Service Manual 7-13

Performance Verification

7.6 Electrical Safety Tests

This section provides values for electrical safety tests required by the warming unit. Technicians must be familiar with the standards applicable to their respective institution and country. Test equipment and its application must comply with the applicable standards.

7.6.1 Ground Bond Test

Without power cord: ≤ 100 m Ω With power cord: ≤ 200 m Ω

7.6.2 Earth Leakage Current Test (Line Leakage)

Table7-1.Earth Leakage Current Test

AC Polarity Line Cord Neutral Cord Leakage Current

Normal Closed Closed 300 μA

Reversed Closed Closed 300 μA

Normal Open Closed 1000 μA

Normal Closed Open 1000 μA

7.6.3 Enclosure Leakage Current Test (Line Leakage)

Table7-2.Enclosure Leakage Current Test

AC Line Cord Neutral Line Cord Power Line

Ground Cable

Normal Closed Closed 100 μA

Normal Closed Open 500 μA

Normal Open Closed 500 μA

AAMI / ANSI

Standard ES1

Reversed Closed Closed 100 μA

Reversed Open Closed 500 μA

Reversed Closed Open 500 μA

7-14 Service Manual

8 External Component Replacement

8.1 Overview

This chapter provides instructions for replacing external components of the Covidien WarmTouch™ Convective Warming Unit.

Pole Clamp Replacement Page 8-2

USB Port Cover Replacement Page 8-4

Power Cord Replacement Page 8-5

Nozzle Replacement Page 8-8

Nozzle Strap with Clip Replacement Page 8-10

No Free-Hosing Label Replacement Page 8-11

8.2 Safety Reminders

 WARNING:

No modification of this equipment is allowed. Modification can result in death, injury, or property damage.

 WARNING:

Before attempting to open or disassemble the warming unit, disconnect the power cord from the AC power source.

 Caution:

Observe ESD (electrostatic discharge) precautions when servicing the warming unit.

8-1

External Component Replacement

8.3 Pole Clamp Replacement

This procedure describes replacing pole clamps only, not the mounting bolts for the clamps. If you are replacing the mounting bolts, refer to Pole Clamp and

Mounting Bolt Replacement on page 11-18.

Figure8-1.Pole Clamps

Requirements:

• WT-CWU Pole Clamp Kit (page A-2)

Note: Each kit contains three clamps, knobs, and mounting bolts.

 WARNING:

Disconnect the warming unit's power cord from the AC power source before performing this procedure.

8-2 Service Manual

Nellcor WarmTouch User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

1.1 Overview

1.2 Safety Information

1.2.1 Safety Symbol Definitions

1.2.2 Warnings (Service)

1.2.3 Cautions (Service)

1.2.4 Warnings (Patient Treatment)

1.2.5 Cautions (Patient Treatment)

1.3 ESD (Electrostatic Discharge) Precautions

1.4 Tools Required for Service

Serial Number, Software Version, and Error Codes

1.6 Component Disposal - WEEE Directive

1.7 Labeling Symbols

1.8 Obtaining Technical Assistance

1.9 Related Documents

1.10 Warranty Information

2.1 Overview

2.2 Product Description

2.2.1 Features

2.2.2 Indications for Use

2.2.3 Contraindications

2.2.4 Covidien WarmTouch™ Warming Blankets

2.3 Product Views

2.3.1 Front View

2.3.2 Back View

2.4 Operator’s Panel

3.1 Overview

3.2 Safety Reminders

3.3 Attaching the Power Cord

3.4 Installing the Warming Unit

3.4.1 IV Pole Installation

3.4.2 Bed Installation

3.4.3 Cart Installation

4.1 Overview

4.2 Safety Reminder

4.3 Applying Power

4.4 Overview of Warming Unit Operating Modes

4.5 Beginning Operation

4.6 Controlling the Temperature

4.6.1 Using Boost Mode

4.6.2 Using the Heat Off Setting

4.6.3 Returning to Ready Mode

4.6.4 Returning to Standby Mode

4.6.5 If Power is Interrupted...

4.7 Powering Off the Warming Unit

5.1 Overview

5.2 Safety Reminders

5.3 Cleaning the Warming Unit

5.4 Safety Checks

5.4.1 Physical Inspection

5.4.2 Temperature and Alarm Verification

5.4.3 Electrical Safety Tests

5.5 Filter Replacement

5.6 Monitoring the Filter Status

6.1 Overview

6.2 Safety Reminders

6.3 Principles of Operation

6.3.1 Overview

6.3.2 Block Diagram

6.3.3 Component Descriptions

Display

Keypad

USB Port

Speaker

UI PCBA

Power PCBA

Power Supply

HEPA Filter

Heater

Thermostat

Thermistor

6.3.4 Component Cable Connections

6.4 Basic Troubleshooting

6.5 Alarms

7.1 Overview

7.2 Safety Reminders