Dräger Narkomed 2B Service Manual

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DrägerService

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Technical

Service

Manual

Part Number: S002011

Date: 20 May 2002

Rev: Y

Narkomed 2B

Anesthesia System

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DrägerService

Narkomed 2B Service Manual Table of Contents

Summary of What's New in Rev. Y

DESCRIPTION PAGE

SECTION 1:

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

SECTION 2:

Diagnostics ............................................................... 2-1

2.1 Service Menu Screen ............................................ 2-2

SECTION 3:

Troubleshooting ............................................................ 3-1

3.1 Power Supply and Voltage Distribution .............................. 3-1

3.2 Battery ...................................................... 3-3

3.3 Troubleshooting Guides .......................................... 3-3

SECTION 4:

Replacement Procedures ..................................................... 4-1

4.1 Cylinder Yoke Assemblies ........................................ 4-2

4.2 Cylinder Pressure Regulators ...................................... 4-5

4.3 Cylinder Cutoff Valves (Canada) ................................... 4-8

4.4 Cylinder and Pipeline Pressure Gauges ............................. 4-11

4.5 Flowmeters .................................................. 4-15

4.6 Flow Control Valves ............................................ 4-19

4.7 Oxygen Supply Pressure Failure Protection Device ..................... 4-22

4.8 Oxygen Supply Pressure Alarm Switch (earlier machines) ............... 4-25

4.9 Oxygen Supply Pressure Alarm Whistle (Canada) ..................... 4-28

4.10 Oxygen Ratio Monitor/Controller .................................. 4-30

4.11 Oxygen Ratio Controller (later machines) ............................ 4-34

4.12 Vaporizers ................................................... 4-37

4.13 O

4.14 AV-E Ventilator Controller Assembly ............................... 4-44

4.15 AV-E Ventilator Solenoid Valve ................................... 4-47

4.16 AV-2 Ventilator Controller Assembly ............................... 4-50

4.17 Convenience Outlet AC Power Filter ............................... 4-53

4.18 AV-E Inspiratory Flow Regulator .................................. 4-56

4.19 Ventilator Bellows Valve and Guide Assembly (AV-E Ventilator) .......... 4-59

4.20 Ventilator Bellows Valve and Guide Asm w/Press Lim Ctrl (AV-2) ......... 4-69

4.21 Alarm Channel (without oxygen supply pressure alarm switch) ........... 4-73

4.22 Alarm Channel and Oxygen Supply Pressure Alarm Switch .............. 4-76

4.23 Caster ...................................................... 4-80

4.24 Battery ..................................................... 4-83

4.25 Power Supply ................................................. 4-86

4.26 Processor Assembly ............................................ 4-89

4.27 CRT Assemblies ............................................... 4-92

4.28 Keypads ..................................................... 4-96

4.29 SPIROMED Respiratory Volume Sensor ............................. 4-99

Flush Valve ................................................ 4-40

Rev. T

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CONTENTS (continued) NM2B

DESCRIPTION PAGE

4.30 Oxygen Sensor .......................................... 4-101

4.31 Manual Sphygmomanometer ............................... 4-103

4.32 Auxiliary Oxygen Flowmeter ............................... 4-105

4.33 PEEP Valve Magnet Assembly Replacement ................... 4-107

SECTION 5:

Adjustment and Calibration Procedures ...................................5-1

5.1 Cylinder Pressure Regulator Adjustment (except CO

5.1A CO

Cylinder Pressure Regulator Adjustment ....................5-4

) ..............5-2

5.2 Oxygen Supply Pressure Alarm Switch Adjustment (earlier machines) . 5-5

5.3 Oxygen Supply Pressure Alarm Switch Adjustment (later machines

with switch on alarm channel) ................ 5-8

5.4 Oxygen Ratio Monitor/Controller (ORMC) Adjustment ............. 5-11

5.5 Oxygen Ratio Controller (ORC) Adjustment ..................... 5-15

5.5A Low Flow Oxygen Ratio Controller (ORC) Adjustment ............5-17A

5.6 Oxygen Sensor Calibration .................................. 5-18

5.7 Breathing Pressure Monitor Calibration ........................ 5-21

5.8 Vaporizer Interlock Adjustment .............................. 5-23

SECTION 6:

PMS Procedure ......................................................6-1

6.1 Electrical Safety ........................................... 6-2

6.2 Self-Diagnostics ...........................................6-4

6.3 Battery Circuit ............................................ 6-5

6.4 Configuration ............................................. 6-5

6.5 Service Data .............................................6-6

6.6 Calibrations ..............................................6-7

6.7A Scavenger, A/C ............................................6-8

6.7B Scavenger, Open Reservoir ...................................6-9

6.7C Scavenger Interface .......................................6-11

6.7D Suction Regulator ........................................ 6-13

6.8 Breathing System ........................................ 6-14

6.9 Manual Sphygmomanometer ................................ 6-22

6.10 Vapor Exclusion System .................................... 6-23

6.11 Yokes & Gauges .......................................... 6-24

6.12 High Pressure Regulator ................................... 6-26

6.13 High Pressure Leak ....................................... 6-28

6.14 Oxygen Supply Failure Protection ............................ 6-31

6.15 Flowmeters ............................................. 6-35

6.16 O

Med................................................. 6-38

6.17 Oxygen Concentrations .................................... 6-40

6.18 Auxiliary Oxygen flowmeter ................................. 6-43

6.19A Oxygen Ratio Controller .................................... 6-44

6.19B Oxygen Ratio Monitor Controller ............................. 6-45

6.20 Baromed ............................................... 6-47

6.21 Ventilator .............................................. 6-49

6.22 Bellows Drive Gas Leak: Adult .............................. 6-50

6.23 Spiromed ............................................... 6-51

Rev. W

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NM2B CONTENTS (continued)

DESCRIPTION PAGE

6.24 Manual Sphygmomanometer ................................ 6-39

6.24A Bellows: Adult ........................................... 6-53

6.24B Ventilator Relief Valve: Adult ............................... 6-53

6.25A Bellows: Pediatric External .................................6-54

6.25B Bellows: Pediatric Internal .................................. 6-56

6.26 Trace & Trend ........................................... 6-58

6.27 Pressure Limit Controller .................................. 6-58

6.28 Bellows Peep Valve .......................................6-59

6.29 Audio Silence ............................................ 6-59

6.30 Oxygen Flush Valve ....................................... 6-60

6.31 Final Tests .............................................. 6-61

SECTION 7:

Software Update Procedure .............................................7-1

SECTION 8: Spare and Replacement Parts

ASSEMBLY/PART PAGE

Monitor Chassis, Front Bezel, Power Supply, Processor Assembly, CRT Assemblies ...... 8-2, 8-3

AV-E Ventilator Box Assembly, Incl. Controller ................................. 8-4, 8-5

AV-2 Ventilator Controller Assembly ......................................... 8-6, 8-7

AV-E Ventilator Bellows Valve & Guide Assembly ............................... 8-8, 8-9

AV-2 Valve Case and Guide Assembly, Press. Limit Control, Bellows Assembly. ...... 8-10, 8-11

Bellows valve assembly details ......................................... 8-11A, 8-11B

Pipeline Inlet Fittings .................................................. 8-12, 8-13

Failsafe Assemblies, Minimum O2Flow Valve Assembly ........................ 8-14, 8-15

Gas Selector Switch and Valves ........................................... 8-16, 8-17

Vapor Exclusion System .............................................. 8-17A, 8-17B

ORMC (Earlier Config.) O2Alarm Switch, Alarm Channel, Alarm Whistle ........... 8-18, 8-19

ORC Assembly ........................................................ 8-20, 8-21

Alarm Channel Assembly with O2Alarm Switch (Later Configurations) ............. 8-22, 8-23

Flowmeter Shields, Knobs, Labels, Gauges .................................. 8-24, 8-25

Flow Tubes, Restrictor Assemblies, Flow Control Valve ......................... 8-26, 8-27

Cyl. Regulator Assemblies, O2Flush Valve and related parts ..................... 8-28, 8-29

CSA Items: Relief Valve, Cylinder Cutoff Valves .............................. 8-30, 8-31

Canada Fresh Gas Outlet ............................................. 8-31A, 8-31B

Cylinder Yokes, Common Parts, Labels ..................................... 8-32, 8-33

Sensor Interface Panel Asms., AC Power, Casters ............................. 8-34, 8-35

Absorber Assembly, Breathing Pressure Hoses, Oxygen Sensor ................... 8-36, 8-37

Ultrasonic Flow Sensor ............................................... 8-37A, 8-37B

Ultrasonic Flow Sensor Mounting Bracket .................................8-37C, 8-37D

Man/Auto Selector Valve ................................................ 8-38, 8-39

Man/Auto Selector Valve (Later Design) .................................... 8-40, 8-41

Auxiliary O2Flowmeter Assembly ......................................... 8-42, 8-43

Open Reservoir Scavenger ............................................... 8-44, 8-45

Open Reservior Scavenger, old style ....................................... 8-46, 8-47

A/C Scavenger ........................................................ 8-48, 8-49

Suction Scavenger ..................................................... 8-50, 8-51

Rev. X

iii

NARKOMED 2B ANESTHESIA SYSTEM

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BOOM

ALARM

DISPLAY

SYSTEM

CONTROL

KEYS

DATA DISPLA

MONITO

CONTROL

KEYS

MANUAL SPHYGMOMANOMETER (OPTIONAL)

BREATHING SYSTEM SENSOR INTERFACE PANEL

SV20001

1-0 Rev. F

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NM2B INTRODUCTION

1.0 Recommendations

Because of the sophisticated nature of Draeger Medical, Inc. anesthesia equipment and its critical importance in the operating room setting, it is highly recommended that only appropriately trained and experienced professionals be permitted to service and maintain this equipment. Please contact DrägerService® at (800) 543-5047 for service of this equipment.

Draeger Medical, Inc. also recommends that its anesthesia equipment be serviced at three-month intervals. Periodic Manufacturer’sService Agreementsare availablefor equipmentmanufactured by Draeger Medical, Inc. For further information concerning these agreements, please contact us at (800) 543-5047.

Draeger Medical, Inc. products/material in need of factory repair shall be sent to:

DrägerService 3124 Commerce Drive Telford, PA 18969 (Include RMA Number)

HOW TO USE THIS MANUAL

The manual is divided into several sections. The DIAGNOSTICS section describes self-test and service diagnostics for checking the system functions. An understanding of the on-board service capabilities is necessary before any attempt is made to troubleshoot the unit. The TROUBLESHOOTING section lists error codes and provides troubleshooting guides to assist the TSR in locating the source of a problem. The REPLACEMENT PROCEDURES section contains instructions for removal and replacement of the assemblies that are considered field-replaceable. The ADJUSTMENT AND CALIBRATION PROCEDURES section contains the field procedures needed to restore original system specifications. The Periodic Manufacturer’s Service (PMS) PROCEDURE section outlines the steps required to verify the electrical, mechanical and pneumatic safety of the unit and also identifies components requiring periodic replacement.

GENERAL TROUBLESHOOTING GUIDELINES

Troubleshooting the Narkomed 2B should always begin by communicating with those who observedor experienced a problem with the unit.This mayeliminate unnecessary troubleshooting steps. Once a general problem is identified, refer to the troubleshooting flow charts in Section 3 to determine the proper corrective action to be taken.

After a component has been replaced, verify that the unit is operating properly by running the appropriate diagnostic procedure. The PMS PROCEDURE in Section 6 must also be performed after any component has been replaced.

The general arrangement of the Narkomed 2B Anesthesia System is shown on the opposite page. WARNINGS are used in this manual before procedures which if not performed correctly could

result in personal injury. CAUTIONS are used in this manual to alert service personnel to the possibility of damage to the

equipment if a procedure is not performed correctly.

Rev. K

1-1

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INTRODUCTION NM2B

Copyright © 2001 by Draeger Medical, Inc. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, or stored in a retrieval system in any form or by any means, electronic or mechanical, including photocopying and recording, without the written permission of Draeger Medical, Inc.

Trademark Notices

CliniDAS, Datagrip, NAD Information Systems, NAD Logo, Narkomed, O.R. Data Manager, O.R. Link, ORM, PC Prep/View, Quality Service For Life, Vigilance Audit, Vitalert, Vitalink and Narkomed GS are registered trademarks of Draeger Medical, Inc. All other products or name brands are trademarks of their respective owners.

Disclaimer

The content of this manual is furnished for informational use only and is subject to change without notice. Draeger Medical, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in this manual.

1-2

Rev. N

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NM2B DIAGNOSTICS

2.0 DIAGNOSTICS

The Narkomed 2B contains a diagnostic system that monitors certain system functions and records their operational status. A series of tests is performed when the system is powered up and the results are displayed on the diagnostics screen shown in Figure 2-1. Further diagnostic functions are available through service screens that can be called up by a TSR at the display panel. The following paragraphs provide a description of each service screen that can be accessed through system control keys on the display panel. If no display is present upon system power-up, refer to Section 3 of this manual for troubleshooting assistance.

NARKOMED 2B

VIDEO TEST PASS VERSION 2.02 DIAGNOSTICS FIRMWARE TEST PASS COPYRIGHT, NAD INC. 1987-89 MEMORY TEST PASS TIMERS TEST PASS ANALOG TEST PASS AUDIO TEST - PRIMARY PASS

- BACKUP PASS SERIAL I/O TEST PASS CLOCK TEST PASS BACKUP MEMORY TEST PASS AC POWER TEST PASS RESERVE POWER TEST PASS

FUNCTIONAL

Figure 2-1: POWER-UP DIAGNOSTICS SCREEN

TRACE

TREND

2-1

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DIAGNOSTICS (continued) NM2B

2.1 Service Menu Screen

To access the Service Menu Screen, press and hold the CONFIG key, and (while holding the CONFIG key) simultaneously press the 21% and APNEA ALARM DISABLE keys. These keys are located on the monitor control key panel. The Service Menu Screen appears as shown in Figure 2-2. Access to the other service functions is gained through the keys to the right of the service screen which temporarily function according to their corresponding on-screen labels.

SERVICE MENU DIAGNOSTICS

CALIBRATION

EXIT

Figure 2-2: SERVICE MENU SCREEN

TRACE

TREND

2-2

Rev. A

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NM2B DIAGNOSTICS (continued)

2.1.1 Diagnostics Menu Screen

Pressing the DIAGNOSTICS key on the Service Menu Screen brings up the Diagnostics Menu Screen. Figure 2-3 shows a typical Diagnostics menu which displays the last service date and an error log. To reset the last service date to the current date, press the RESET DATE key.

NOTE: The RESET DATE key also clears all stored error codes,

so the date should not be reset until the indicated problems are resolved. If the processor assembly must be replaced, the original assembly should be returned to the NAD Technical Service Department with all of its stored error codes.

Each line in the Error Log is displayed as three groups of hexadecimal characters, with each group having a left and right character (see Figure 2-3). Tables 2-1, 2-2 and 2-3 on the following pages list the possible errors that correspond to the displayed characters in each group.

DIAGNOSTICS MENU KEY TEST

LAST SERVICE DATE 14-JUN-91 ERROR LOG 00

Group 1 Group 2 Group 3

00 40 RESET DATE

EXIT

Figure 2-3: DIAGNOSTICS MENU SCREEN

TRACE

TREND

Rev. L

2-3

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DIAGNOSTICS (continued) NM2B

Table 2-1: NARKOMED 2B ERROR CODES, GROUP 1

Left

Char. Error(s)

0 No Error 0 No Error 1 System memory fail (checkerboard test) 1 CRT controller fail (readback test) 2 System memory fail (ROM compare test) 2 CRT memory fail (checkerboard test) 3 System memory fail (checkerboard test)

System memory fail (ROM compare test) 4 CTC fail (timer function test) 4 CRT memory fail (ROM compare test) 5 CTC fail (timer function test)

System memory fail (checkerboard test) 6 CTC fail (timer function test)

System memory fail (ROM compare test) 7 CTC fail (timer function test)

System memory fail (ROM compare test)

System memory fail (checkerboard test) 8 CTC fail (interrupt logic test) 8 ROM fail (firmware CRT test) 9 CTC fail (interrupt logic test)

System memory fail (checkerboard test)

Right Char. Error(s)

3 CRT controller fail (readback test)

CRT memory fail (checkerboard test)

5 CRT memory fail (ROM compare test)

CRT controller fail (readback test)

6 CRT memory fail (ROM compare test)

CRT memory fail (checkerboard test)

7 CRT memory fail (ROM compare test)

CRT memory fail (checkerboard test) CRT controller fail (readback test)

9 ROM fail (firmware CRT test)

CRT controller fail (readback test)

A CTC fail (interrupt logic test)

System memory fail (ROM compare test) B CTC fail (interrupt logic test)

System memory fail (ROM compare test)

System memory fail (checkerboard test) C CTC fail (interrupt logic test)

CTC fail (timer function test) D CTC fail (interrupt logic test)

CTC fail (timer function test)

System memory fail (checkerboard test) E CTC fail (timer function test)

CTC fail (interrupt logic test)

System memory fail (ROM compare test) F CTC fail (interrupt logic test)

CTC fail (timer function test)

System memory fail (ROM compare test)

System memory fail (checkerboard test)

A ROM fail (firmware CRT test)

CRT memory fail (checkerboard test)

B ROM fail (firmware CRT test)

CRT memory fail (checkerboard test) CRT controller fail (readback test)

C ROM fail (firmware CRT test)

CRT memory fail (ROM compare test)

D ROM fail (firmware CRT test)

CRT memory fail (ROM compare test) CRT controller fail (readback test)

E ROM fail (firmware CRT test)

CRT memory fail (ROM compare test) CRT memory fail (checkerboard test)

F ROM fail (firmware CRT test)

CRT memory fail (ROM compare test) CRT memory fail (checkerboard test) CRT controller fail (readback test)

2-4

Rev. L

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NM2B DIAGNOSTICS (continued)

Table 2-2: NARKOMED 2B ERROR CODES, GROUP 2

Left

Char. Error(s)

0 No Error 0 No Error 1 Backup audio fail (sound generation test) 1 A/D conv. fail (analog V out of range) 2 Serial port B fail (channel A on UART) 2 Primary audio fail (speaker test) 3 Backup audio fail (sound generation test)

Serial port B fail (channel A on UART) 4 Serial port A fail (channel B on UART) 4 Primary audio fail (sound gen. test) 5 Serial port A fail (channel B on UART)

Backup audio fail (sound generation test) 6 Serial port A fail (channel B on UART)

Serial port B fail (channel A on UART) 7 Serial port A fail (channel B on UART)

Serial port B fail (channel A on UART)

Backup audio fail (sound generation test) 8 Clock fail (cannot read) 8 Backup audio fail (speaker test) 9 Clock fail (cannot read)

Backup audio fail (sound generation test)

Right Char. Error(s)

3 A/D conv. fail (analog V out of range)

Primary audio fail (speaker test)

5 Primary audio fail (sound gen. test)

A/D conv. fail (analog V out of range)

6 Primary audio fail (sound gen. test)

Primary audio fail (speaker test)

7 Primary audio fail (sound gen. test)

Primary audio fail (speaker test) A/D conv. fail (analog V out of range)

9 Backup audio fail (speaker test)

A/D conv. fail (analog V out of range)

A Clock fail (cannot read)

Serial port B fail (channel A on UART)

B Clock fail (cannot read)

Serial port B fail (channel A on UART)

Backup audio fail (sound generation test)

C Clock fail (cannot read)

Serial port A fail (channel B on UART)

D Clock fail (cannot read)

Serial port A fail (channel B on UART)

Backup audio fail (sound generation test)

E Clock fail (cannot read)

Serial port A fail (channel B on UART)

Serial port B fail (channel A on UART)

F Clock fail (cannot read)

Serial port A fail (channel B on UART)

Serial port B fail (channel A on UART)

Backup audio fail (sound generation test)

A Backup audio fail (speaker test)

Primary audio fail (speaker test)

B Backup audio fail (speaker test)

Primary audio fail (speaker test) A/D conv. fail (analog V out of range)

C Backup audio fail (speaker test)

Primary audio fail (sound gen. test)

D Backup audio fail (speaker test)

Primary audio fail (sound gen. test) A/D conv. fail (analog V out of range)

E Backup audio fail (speaker test)

Primary audio fail (sound gen. test) Primary audio fail (speaker test)

F Backup audio fail (speaker test)

Primary audio fail (sound gen. test) Primary audio fail (speaker test) A/D conv. fail (analog V out of range)

Rev. L

2-5

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DIAGNOSTICS (continued) NM2B

Table 2-3: NARKOMED 2B ERROR CODES, GROUP 3

Left

Char. Error(s)

0 No Error 0 No Error 1 Backup memory fail (ROM compare test) 1 Clock fail (write/readback test) 2 Backup memory fail (array recall test) 2 Clock fail (original time test) 3 Backup memory fail (ROM compare test)

Backup memory fail (array recall test) 4 AC power fail 4 Clock fail (seconds not incrementing) 5 AC power fail

Backup memory fail (ROM compare test) 6 AC power fail

Backup memory fail (array recall test) 7 AC power fail

Backup memory fail (array recall test)

Backup memory fail (ROM compare test) 8 Reserve power fail (batt. low/disconnected) 8 Backup memory fail (checkerboard test) 9 Reserve power fail (batt. low/disconnected)

Backup memory fail (ROM compare test)

Right Char. Error(s)

3 Clock fail (write/readback test)

Clock fail (original time test)

5 Clock fail (seconds not incrementing)

Clock fail (write/readback test)

6 Clock fail (seconds not incrementing)

Clock fail (original time test)

7 Clock fail (seconds not incrementing)

Clock fail (original time test) Clock fail (write/readback test)

9 Backup memory fail (checkerboard test)

Clock fail (write/readback test)

A Reserve power fail (batt. low/disconnected)

Backup memory fail (array recall test) B Reserve power fail (batt. low/disconnected)

Backup memory fail (array recall test)

Backup memory fail (ROM compare test)

C Reserve power fail (batt. low/disconnected)

AC power fail

D Reserve power fail (batt. low/disconnected)

AC power fail

Backup memory fail (ROM compare test) E Reserve power fail (batt. low/disconnected)

AC power fail

Backup memory fail (array recall test) F Reserve power fail (batt. low/disconnected)

AC power fail

Backup memory fail (array recall test)

Backup memory fail (ROM compare test)

A Backup memory fail (checkerboard test)

Clock fail (original time test)

B Backup memory fail (checkerboard test)

Clock fail (original time test) Clock fail (write/readback test)

C Backup memory fail (checkerboard test)

Clock fail (seconds not incrementing)

D Backup memory fail (checkerboard test)

Clock fail (seconds not incrementing) Clock fail (write/readback test)

E Backup memory fail (checkerboard test)

Clock fail (seconds not incrementing) Clock fail (original time test)

F Backup memory fail (checkerboard test)

Clock fail (seconds not incrementing) Clock fail (original time test) Clock fail (write/readback test)

2-5A Rev. L

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NM2B DIAGNOSTICS (continued)

With the exception of the error codes corresponding to AC power and battery failure, the codes listed in Tables 2-1 thru 2-3 indicate a possible problem in the NARKOMED 2B processor assembly.

Troubleshooting should begin with a check of the power supply voltages on the processor board (see Section 3) followed by a check of all connections to the processor assembly. Refer to Section 4 for removal and replacement procedures for the field-replaceable assemblies in the NARKOMED 2B.

Rev. L

2-5B

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DIAGNOSTICS (continued) NM2B

2.1.1.1 Key Panel Test Screen

Pressing the KEY TEST key in the Diagnostics Menu Screen allows the TSR to check each key on the display panel. As each key on the display panel is pressed, a corresponding key is illuminated on the Key Panel Test Screen as shown in Figure 2-4.

NOTE: The TREND key should be pressed last,

because it also exits the Key Panel Test Screen.

If the correct keypanel response is not obtained, refer to Section 3 for the appropriate troubleshooting procedure.

Figure 2-4: KEY PANEL TEST SCREEN

2-6

EXIT

TRACE

TREND

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NM2B DIAGNOSTICS (continued)

2.1.2 Calibration Menu Screen

Pressing the CALIBRATION key on the Service Menu Screen brings up the Calibration Menu Screen. This menu allows the TSR to perform calibration for the Oxygen Analyzer sensor and the Breathing Pressure Monitor. Figure 2-5 shows a typical Calibration Menu Screen. The fourdigit numbers in the left column show the current values, while the numbers in the right column show the values stored from the previous calibration.

For a valid zero calibration of the Oxygen Analyzer sensor, the two offset readings should be between 125 and 145, and the difference between Cell A and Cell B should be no greater than 8. Pressing the O2MED key stores the values, and the message OXYGEN OFFSET READINGS STORED appears on the screen. Refer to Section 5 of this manual for the complete calibration procedure.

For a valid calibration of the Breathing Pressure Monitor, the pressure span reading at 60 cm H the BAROMED key stores the value, and the message PRESSURE SPAN READING STORED appears on the screen. Refer to Section 5 of this manual for the complete calibration procedure.

O should be between 465 and 519. Pressing

CALIBRATION MENU O2MED

OFFSET O2 CELL A 0138 0127 OFFSET O2 CELL B 0138 0129

BAROMED

OXYGEN OFFSET READINGS STORED

TRACE

PRESSURE SPAN (60 cm H2O) 0243 0481

Figure 2-5: CALIBRATION MENU SCREEN

Rev. A

2-7

EXIT

TREND

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NM2B TROUBLESHOOTING GUIDE

3.0 TROUBLESHOOTING

This section contains information to assist the Draeger Medical, Inc. qualified Technical Service Representative (TSR) in locating electrical faults affecting the NARKOMED 2B monitoring and display devices. Since most troubleshooting efforts begin with verifying power supply voltages, the following paragraph outlines the voltage distribution scheme within the machine along with test points for each of the voltages.

3.1 Power Supply and Voltage Distribution

In the NARKOMED 2B the power supply outputs at J10 are connected to J5 on the processor board for distribution. The CRTs are powered by 12 VDC; the ventilator controller and the alarm channel are powered by 8 VDC. The processor is powered by 5 VDC along with the other voltages. Under normal load conditions these voltages are measured at the (+) end of capacitors C23, C24 and C31 on the processor board. See Figure 3-1. The voltmeter return should be connected to the (-) end of one of the capacitors. Table 3-1 lists the acceptable range for each voltage.

TABLE 3-1: PROCESSOR BOARD VOLTAGES

LOCATION VOLTAGE ACCEPTABLE RANGE

+ End of C23 + 5 VDC 4.85 to 5.15 VDC + End of C24 + 8 VDC 7.45 to 8.47 VDC + End of C31 +12VDC 11.52 to 12.24 VDC

The power supply voltages can also be measured in an unloaded condition.

CAUTION

: Before disconnecting the output cable from J10 on the power

supply assembly, turn the System Power switch to STANDBY, and disconnect the data cable from J9 on the power supply assembly.

The test points are:

+5V: J10-3,-4 +8V: J10-1,-2 +12V: J10-5,-6 Com: J10-7,-8

Rev. H

3-1

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TROUBLESHOOTING GUIDE (continued) NM2B

TOP VIEW OF

PROCESSOR ASSEMBLY

SV20313

C31

C24

C23

Figure 3-1: PROCESSOR BOARD VOLTAGE TEST POINTS

3-2

Rev. A

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NM2B TROUBLESHOOTING GUIDE (continued)

3.2 Battery

While the machine is operating from an AC line, the battery voltage at full charge should be within the range of 12.83 to 14.18 VDC. Battery voltage can be measured between J7-3(+) and J7-4(-). During battery operation, the low battery cutoff voltage should be within the range of 9.79 to 10.82 VDC.

3.3 Troubleshooting Guides

Table 3-2 lists common failure modes and symptoms (excluding simultaneous multiple faults) for the monitoring and display devices in the NARKOMED 2B. Each failure mode or symptom is keyed to a troubleshooting guide flow chart on the following pages to assist in locating a problem. These flow charts assume that the machine is plugged into an AC outlet with the correct voltage, and the machine is not running on its backup battery.

TABLE 3-2: NARKOMED 2B FAILURE MODE AND SYMPTOM LIST

FAILURE MODE / SYMPTOM CORRECTIVE ACTION

Loss of O2Monitor Guide 1 Loss of Breathing Pressure Monitor Guide 2 Loss of Respiratory Volume Monitor Guide 3 No Audio Alarms Guide 4 Vitalink Failure Guide 5 Incorrect Display Guide 6 No Oxygen Ratio Monitor Alarms Guide 7 No Oxygen Supply Pressure Alarms Guide 8 Display Screens Blank Upon System Power-up Guide 9 No Keypanel Response Guide 10

Rev. A

3-3

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TROUBLESHOOTING GUIDE (continued) NM2B

GUIDE 1: Loss of O

CONNECT OXYGEN SENSOR CABLE TO

INTERFACE PANEL

CONNECT CABLE TO J10 ON PROCESSOR

BOARD (ALSO

CHECK CONTINUITY OF

INTERNAL CABLE)

Monitor

START

CENTRALERT ALARM

OXYGEN ANALYZER

FUNCTIONAL?

"O2 SENS DISC"

DISPLAYED ON

DISPLAY?

IS CABLE

CONNECTED TO

J10 ON PROCESSOR

BOARD?

PERFORM A

COMPLETE PMS

ON UNIT

DOES UNIT PASS PMS?

OXYGEN ANALYZER

FUNCTIONAL?

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

REPLACE

OXYGEN SENSOR

ASOUTLINED IN

PROCEDURE 4.30

OXYGEN ANALYZER

FUNCTIONAL?

REINSTALL ORIGINAL

OXYGEN SENSOR

-----------------------REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

CONTACT NAD

SERVICE DEPT.

UNIT IS

FUNCTIONAL

3-4

Rev. A

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NM2B TROUBLESHOOTING GUIDE (continued)

GUIDE 2: Loss of Breathing Pressure Monitor

START

CONNECT

PILOT LINE

AT BOTH ENDS

CONNECT TUBING TO

TRANSDUCER ON

PROCESSOR BOARD

(ALSO CHECK

CONTINUITY OF

INTERNAL TUBING

CONNECTIONS)

PRESSURE MONITOR

FUNCTIONAL?

CONNECTED TO

INTERFACE PANEL AND TO

PATIENT Y-PIECE OR

PRESSURE TUBING

CONNECTED TO

TRANSDUCER ON

PROCESSOR

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

BREATHING

PILOT LINE

ABSORBER?

BREATHING

BOARD?

REPLACE

BREATHING

PRESSURE MONITOR

FUNCTIONAL?

REINSTALL ORIGINAL

PROCESSOR

ASSEMBLY

CONTACT NAD

SERVICE DEPT.

PERFORM A

COMPLETE PMS

ON UNIT

DOES

UNIT PASS

PMS?

UNIT IS

FUNCTIONAL

Rev. A

3-5

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TROUBLESHOOTING GUIDE (continued) NM2B

GUIDE 3: Loss of Respiratory Volume Monitor

START

CONNECT VOLUME SENSOR CABLE TO

INTERFACE PANEL

CONNECT CABLE TO

J9 ON PROCESSOR

BOARD (ALSO

CHECK CONTINUITY OF

INTERNAL CABLE)

VOLUME MONITOR

CENTRALERT ALARM

J9 ON PROCESSOR

VOLUME MONITOR

FUNCTIONAL?

"VOL SENS DISC"

DISPLAYED ON

DISPLAY?

IS CABLE

CONNECTED TO

BOARD?

REPLACE

VOLUME SENSOR

ASOUTLINED IN

PROCEDURE 4.29

FUNCTIONAL?

PERFORM A

COMPLETE PMS

ON UNIT

DOES UNIT PASS PMS?

UNIT IS

FUNCTIONAL

VOLUME MONITOR

FUNCTIONAL?

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

CONTACT NAD

SERVICE DEPT.

REINSTALL ORIGINAL

VOLUME SENSOR

-----------------------REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

3-6

Rev. A

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NM2B TROUBLESHOOTING GUIDE (continued)

GUIDE 4: No Audio Alarms

START

ARE

WARNINGS AND

CAUTIONS AUDIBLY

ANNUNCIATED?

REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

ARE

WARNINGS AND

CAUTIONS AUDIBLY

ANNUNCIATED?

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

PERFORM A

COMPLETE PMS

ON UNIT

DOES

UNIT PASS

PMS?

Rev. A

CONTACT NAD

SERVICE DEPT.

3-7

UNIT IS

FUNCTIONAL

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TROUBLESHOOTING GUIDE (continued) NM2B

GUIDE 5: Vitalink Failure

START

CONNECT

PERIPHERAL CABLE

TO SERIAL

HOST FAIL TO

COMMUNICATE WITH

CABLE CONNECTED

TO SERIAL INTERFACE

CHECK PERIPHERAL

& HOST SERIAL

CONFIGURATION

HOST FAIL TO

COMMUNICATE WITH

DOES

PERIPHERAL

DEVICE?

PERIPHERAL

PORT?

PORT

SETTINGS

DOES

PERIPHERAL

DEVICE?

DOES

HOST FAIL TO

COMMUNICATE WITH

PERIPHERAL

DEVICE?

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

CONTACT NAD

SERVICE DEPT.

PERFORM A

COMPLETE PMS

ON UNIT

DOES UNIT PASS PMS?

UNIT IS

FUNCTIONAL

REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

3-8

Rev. A

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NM2B TROUBLESHOOTING GUIDE (continued)

GUIDE 6: Incorrect Display

START

IS WRONG

MONITOR SCREEN

DISPLAYED?

REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

IS WRONG

MONITOR SCREEN

DISPLAYED?

PERFORM A

COMPLETE PMS

ON UNIT

Rev. A

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

CONTACT NAD

SERVICE DEPT.

3-9

DOES

UNIT PASS

PMS?

UNIT IS

FUNCTIONAL

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TROUBLESHOOTING GUIDE (continued) NM2B

GUIDE 7: No Oxygen Ratio Monitor Alarms

START

ARE O2 / N2O

RATIO ALARMS

FUNCTIONAL?

IS O2 / N2O

FLOW RATIO

LED INDICATOR

FUNCTIONAL?

CHECK ORMC

ADJUSTMENTS AS OUTLINED IN PROCEDURE 5.4

IS O2 / N2O

FLOW RATIO

LED INDICATOR

FUNCTIONAL?

REPLACE ALARM

CHANNEL ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.21

"O2 / N20 LOW" DISPLAYED ON

CENTRALERT ALARM

PANEL?

IS O2 / N2O

FLOW RATIO

LED INDICATOR

FUNCTIONAL?

REINSTALL ORIGINAL

ORMC

REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

ARE O2 / N2O

RATIO ALARMS

FUNCTIONAL?

COMPLETE PMS

FUNCTIONAL

PERFORM A

ON UNIT

DOES

UNIT PASS

PMS?

UNIT IS

IS O2 / N2O

FLOW RATIO

LED INDICATOR

FUNCTIONAL?

REINSTALL ORIGINAL

ALARM CHANNEL

-------------------REPLACE ORMC AS OUTLINED IN

PROCEDURE 4.10

REINSTALL ORIGINAL

PROCESSOR

ASSEMBLY

CONTACT NAD

SERVICE DEPT.

3-10

Rev. A

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NM2B TROUBLESHOOTING GUIDE (continued)

GUIDE 8: No Oxygen Supply Pressure Alarms

START

ARE

OXYGEN SUPPLY

PRESSURE ALARMS

FUNCTIONAL?

IS O2

SUPPLY PRESSURE

LED INDICATOR

FUNCTIONAL?

REPLACE OXYGEN

SUPPLY PRESSURE

ALARM SWITCH

AS OUTLINED IN

PROCEDURE 4.8 OR 4.22

IS O2

SUPPLY PRESSURE

LED INDICATOR

FUNCTIONAL?

REINSTALL ORIGINAL

OXYGEN SUPPLY

ALARM SWITCH

--------------------

REPLACE

ALARM CHANNEL

AS OUTLINED IN

PROCEDURE 4.21 OR 4.22

"LOW O2 SUPPLY"

DISPLAYED ON

CENTRALERT ALARM

PANEL?

IS O2

SUPPLY PRESSURE

LED INDICATOR

FUNCTIONAL?

REINSTALL ORIGINAL

ALARM CHANNEL

REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

ARE

OXYGEN SUPPLY

PRESSURE ALARMS

FUNCTIONAL?

REINSTALL ORIGINAL

PROCESSOR

ASSEMBLY

COMPLETE PMS

FUNCTIONAL

PERFORM A

ON UNIT

DOES

UNIT PASS

PMS?

UNIT IS

Rev. A

3-11

CONTACT NAD

SERVICE DEPT.

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TROUBLESHOOTING GUIDE (continued) NM2B

GUIDE 9: Display Screens Blank Upon System Power-Up

START

CONNECT

CABLES

TO J3 & J4 ON

PROCESSOR

ARE

DISPLAY SCREENS

BLANK UPON SYSTEM

POWER-UP?

ARE

CABLES

CONNECTED TO J3 & J4

ON PROCESSOR

BOARD?

CHECK POWER

SUPPLY

VOLTAGES

AS OUTLINED IN

SECTION 3.1

ARE

DISPLAY SCREENS

BLANK UPON SYSTEM

POWER-UP?

ARE

DISPLAY SCREENS

BLANK UPON SYSTEM

POWER-UP?

REINSTALL ORIGINAL

CRT ASSEMBLY

----------------------REPLACE

PROCESSOR

ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

ARE

DISPLAY SCREENS

BLANK UPON SYSTEM

POWER-UP?

PERFORM A

COMPLETE PMS

ON UNIT

DOES UNIT

PASS PMS?

FUNCTIONAL

UNIT IS

REPLACE

CRT ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.27

3-12

REINSTALL ORIGINAL

PROCESSOR

ASSEMBLY

CONTACT NAD

SERVICE DEPT.

Rev. D

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NM2B TROUBLESHOOTING GUIDE (continued)

GUIDE 10: No Keypanel Response

START

CONNECT CABLES

TO J1 & J2 ON

PROCESSOR BOARD

ARE DISPLAY PANEL KEYS WORKING

PROPERLY?

ARE

CABLES

CONNECTED TO J1 & J2

ON PROCESSOR

BOARD?

REPLACE KEYPAD

AS OUTLINED IN

PROCEDURE 4.28

ARE DISPLAY PANEL KEYS WORKING

PROPERLY?

ARE DISPLAY PANEL KEYS WORKING

PROPERLY?

REINSTALL ORIGINAL

PROCESSOR ASSEMBLY

CONTACT NAD

SERVICE DEPT.

PERFORM A

COMPLETE PMS

ON UNIT

DOES UNIT PASS PMS?

UNIT IS

FUNCTIONAL

Rev. A

REINSTALL ORIGINAL

KEYPAD

-----------------------REPLACE

PROCESSOR ASSEMBLY

AS OUTLINED IN

PROCEDURE 4.26

3-13

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NM2B REPLACEMENT PROCEDURES

4.0 REPLACEMENT PROCEDURES

This section outlines removal and replacement procedures for the field-replaceable assemblies of the NARKOMED 2B Anesthesia System.

These procedures are to be performed only by a Draeger Medical, Inc. qualified Technical Service Representative (TSR).

The following are the only procedures authorized by Draeger Medical, Inc. to be performed in the field. All other service procedures shall be referred to NAD’s Technical Service Department.

NOTE: The PMS PROCEDURE detailed in Section 6 must be

performed after any replacement, removal, calibration or adjustment procedure.

Rev. H

4-1

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REPLACEMENT PROCEDURES (continued) NM2B

4.1 Cylinder Yoke Assemblies

Each cylinder yoke contains a replaceable filter and check valve assembly. Replacement of this assembly requires that the yoke be removed from the anesthesia machine. Figure 4-1 shows a typical cylinder yoke mounting arrangement. Access to the yoke mounting screws and gas line connection requires that the table top be removed from the machine.

4.1.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.1.2 Close all cylinder valves except the O

valve.

4.1.3 Set the oxygen flow to 5 liters per min.

4.1.4 Open the other gas flow control valves to drain pressure from the system.

4.1.5 Close the O the O

Flush valve to drain oxygen pressure from the system.

cylinder valve, and close the flow control valves. Press

4.1.6 Set the System Power switch to STANDBY.

4.1.7 Remove the cylinder where the yoke is to be replaced.

WARNING: Store the cylinder in a safe place and lay it on its side.

4.1.8 Remove the screws holding the table top to the machine and lift out the table top.

4.1.9 Pull the writing or keyboard tray out to its fully extended position.

4.1.10 Disconnect the gas line fitting at the yoke and remove the two yoke mounting screws.

4.1.11 Remove the filter and check valve assembly from the yoke and install a replacement assembly.

NOTE: If the entire yoke assembly is being replaced, ensure that the

replacementyoke has the correct label and pinindexing arrangement.

NOTE: If the yoke spacer is removed from the frame rail of the machine, be

sure to re-install it in its original position.

4-2

Rev. A

YOKE

ASSEMBLY

(TYPICAL)

FILTER AND

CHECK VALVE

ASSEMBLY

GAS LINE

YOKE SPACER

SV40601

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-1: CYLINDER YOKE ASSEMBLY

Rev. J

4-3

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REPLACEMENT PROCEDURES (continued) NM2B

4.1.12 Position the yoke on the spacer, and install the two mounting screws and lockwashers. Tighten the screws securely. Connect the gas line fitting to the yoke.

4.1.13 If a new cylinder is being installed, remove the old sealing washer from the gas inlet of the yoke and install a new washer.

4.1.14 Install the correct cylinder in the yoke, making sure that the index pins are properly engaged before tightening the handle bolt. The cylinder should hang vertically after the handle is tight.

4.1.15 Perform the following leak test on the yoke assembly:

4.1.15.1 Open the cylinder valve and check for a pressure

indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must

contain the following minimum pressure:

O N

: 1000 PSI

O : 700 PSI

HE : 1000 PSI CO

: 800 PSI

AIR : 1000 PSI N O

: 1000 PSI

-He : 1000 PSI

4.1.15.2 Closethe cylinder valve and remove the cylinder from the

yoke.

4.1.15.3 For any gas, the pressure should not drop more than 50

PSI in two minutes.

4.1.16 Re-install the cylinder in the yoke.

4.1.17 Replace the table top and its retaining screws.

4.1.18 Replace the pipeline hoses.

4.1.19 Perform the PMS Procedure given in Section 6.

4-4

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.2 Cylinder Pressure Regulators

Access to the cylinder pressure regulators requires that the table top be removed from the anesthesia machine. Figure 4-2 shows the mounting arrangement of the regulators and typical connections.

4.2.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.2.2 Close all cylinder valves except the O

valve.

4.2.3 Set the oxygen flow to 5 liters per min.

4.2.4 Open the other gas flow control valves to drain pressure from the system.

4.2.5 Close the O the O

Flush valve to drain oxygen pressure from the system.

cylinder valve, and close the flow control valves. Press

4.2.6 Set the System Power switch to STANDBY.

4.2.7 Remove the cylinder corresponding to the regulator to be replaced.

4.2.8 Remove the screws holding the table top to the machine and lift out the table top.

4.2.9 Remove the top drawer from the cabinet and pull the writing or keyboard tray out to its fully extended position.

4.2.10 Disconnect the three compression fittings at the regulator.

4.2.11 Loosen the two setscrews holding the regulator to its mounting bracket and remove the regulator.

Rev. A

4.2.12 Record the serial number of the regulator that was removed, and record the serial number of the replacement regulator.

NOTE: If fittings must be installed in the replacement regulator, use Loctite

#271 (red). Refer to the parts list in Section 8.

NOTE: For Canadian machines, verify that the correct relief valve is

installed in the regulator. Refer to the parts list in Section 8 for CSA items.

4.2.13 Position the replacement regulator in its mounting bracket, and connect the three compression fittings. Do not tighten the fittings yet.

4-5

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REPLACEMENT PROCEDURES (continued) NM2B

TOP VIEW OF NARKOMED 4

WITH TABLE TOP REMOVED

O CYLINDER

PRESSURE REGULATOR

SET SCREWS

N O CYLINDER

PRESSURE

REGULATOR

AIR OR OPTIONAL

3RD GAS CYLINDER

PRESSURE REGULATOR

TEST GAUGE CONNECTION (TYPICAL)

CPR

Figure 4-2: CYLINDER PRESSURE REGULATORS

4-6

SIDE VIEW

ADJUSTMENT

SCREW

ACORN NUT

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.2.14 Tighten the regulator mounting setscrews to a torque of 50 to 55 in. lbs.

4.2.15 Tighten the compression fittings.

4.2.16 Locate the TEE fitting in the ¼ in. diameter regulator output line, and remove the plug from the TEE fitting.

4.2.17 Set the regulator output pressure in accordance with the Cylinder Pressure Regulator Adjustment given in Section 5.

4.2.18 Perform the following leak test on the high pressure side of the regulator:

4.2.18.1 Open the cylinder valve and check for a pressure

indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must

contain the following minimum pressure: O

: 1000 Psi

O : 700 Psi

HE : 1000 Psi CO

: 800 Psi

AIR : 1000 Psi

: 1000 Psi

4.2.18.2 Closethe cylinder valve and remove the cylinder from the

yoke.

4.2.18.3 For any gas, the pressure should not drop more than 50

Psi in two minutes.

4.2.19 Re-install the cylinder in the yoke.

4.2.20 Replace the table top and its retaining screws.

4.2.21 Replace the top drawer in the cabinet.

4.2.22 Connect the pipeline hoses.

Rev. A

4.2.23 Perform the PMS Procedure given in Section 6.

4-7

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REPLACEMENT PROCEDURES (continued) NM2B

4.3 Cylinder Cutoff Valves (Canada)

Access to the cylinder cutoff valves requires removal of the table top from the anesthesia machine. Figure 4-3 shows the locations of the O andN

Ocutoff valve assemblies. The instructions apply to all three assemblies.

, Air or 3rd gas,

On earlier machines the tubing arrangement may be slightly different from that illustrated.

NOTE: Replacement of the O

Cutoff Valve Assembly shall be performed every

24 months. Documentation shall be created by the service person and a copy distributed to the owner institution. Testing of the O

Cutoff Valve shall be

performed at each PMS. (Perform the flow test given at the end of the following procedure)

4.3.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.3.2 Close all cylinder valves except the O

valve.

4.3.3 Set the oxygen flow to 5 liters per min.

4.3.4 Open the other gas flow control valves to drain pressure from the system.

4.3.5 Close the O the O

Flush valve to drain oxygen pressure from the system.

cylinder valve, and close the flow control valves. Press

4.3.6 Set the System Power switch to STANDBY.

4.3.7 Remove the screws holding the table top to the machine and lift out the table top.

4.3.8 Remove the top drawer from the cabinet and pull the writing or keyboard tray out to its fully extended position.

4.3.9 Disconnect the compression fittings indicated at points marked C on the illustration.

4.3.10 Cut the tie-wrap clamp and disconnect the flexible tubing from the cutoff valve assembly at the point marked A on the illustration.

NOTE: On later machines with assemblies that have brass fittings instead

of nylon, the flex tubing is attached with a press-on hose clamp instead of a tie strap.

4.3.11 Remove the cylinder cutoff assembly.

4.3.12 Connect the flexible tubing to the replacement cutoff valve assembly and secure it with a new tie-wrap clamp.

4-8

Rev. D

SV50526

O2 CYLINDER

CUTOFF VALVE

ASSEMBLY

AIR OR 3RD GAS

CYLINDER

CUTOFF VALVE

ASSEMBLY

N2O CYLINDER

CUTOFF VALVE

ASSEMBLY

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-3: CYLINDER CUTOFF VALVES (CANADA)

Rev. J

4-9

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REPLACEMENT PROCEDURES (continued) NM2B

4.3.13 Connect and tighten the compression fittings at points marked C on the illustration.

4.3.14 Perform the following test: --Remove the plug from the test gauge connection at the Tee fitting in the regulator outlet piping, and install a test gauge.

NOTE: The cylinders used for this test must contain the following minimum

pressure: O

: 1000 PSI AIR : 1000 PSI

+He : 1000 PSI N2O : 745 PSI

--Set the System Power switch to ON.

--For the O

cutoff valve: open the O2cylinder valve and set the oxygen flow to

4 liters per min.

--For the N

O cutoff valve: open the O2cylinder valve and the N2O cylinder

valve. Set each flow to 4 liters per min.

--Verify that regulator outlet pressure is between 43 and 49 PSI.

--Connect the pipeline hoses and pressurize to 50 PSI.

--Turn off the pipeline supply and observe the pipeline pressure gauge.

--The cutoff valve shall open when the pipeline pressure drops through the range of 45 to 40 PSI.

--Close the cylinder valve(s), and close the flow control valve(s).

--Disconnect test pressure gauge and reinstall the plug in the regulator outlet piping.

4.3.15 Replace the table top and its retaining screws.

4.3.16 Replace the top drawer in the cabinet.

4.3.17 Connect the pipeline hoses.

4.3.18 Perform the PMS Procedure given in Section 6.

Flow Test:

--Disconnect all pipeline supplies.

--Install a full O2cylinder on the machine, and open the cylinder valve.

--Turn the System Power switch to ON.

--Set the Inspiratory Flow control to maximum high, and turn the ventilator switch to ON.

--Set the oxygen flow to 10 l/min.

--Verify that the oxygen flow does not drop below 8 l/min. while the ventilator is running.

--Press and hold the O2FLUSH button while observing the O2flowmeter, and verify that the oxygen flow does not drop below 8 l/min.

--If the oxygen flow in either of the above two steps drops below 8 l/min., replace the O2cutoff valve assembly.

4-10

Rev. D

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NM2B REPLACEMENT PROCEDURES (continued)

4.4 Cylinder and Pipeline Pressure Gauges

Replacement of the cylinder and pipeline pressure gauges requires that the plexiglass front cover be removed from the gas instrumentation panel, and also the rear cover for access to the gauge connections. Figure 4-4 shows disassembly and mounting details.

4.4.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.4.2 Close all cylinder valves except the O

valve.

4.4.3 Set the oxygen flow to 5 liters per min.

4.4.4 Open the other gas flow control valves to drain pressure from the

system.

4.4.5 Close the O

the O

Flush valve to drain oxygen pressure from the system.

cylinder valve, and close the flow control valves. Press

4.4.6 Set the System Power switch to STANDBY.

4.4.7 Remove the screws holding the rear cover, and remove the cover.

4.4.8 Remove the screws holding the table top to the machine and lift out

the table top.

4.4.9A Early models: Remove the two screws (from the back) holding the

front plate at the top of the plexiglass cover. Hold the front plate as the screws are removed from the back.

4.4.9B Later models (without the O

O ratio alarm lamp): Remove the six

2/N2

screws holding the flowmeter shield and vapor box cover panel, and remove the panel.

Rev. A

4.4.10 Remove the O

flow control knob. The knob has two setscrews.

NOTE: If the knob must be rotated to allow access to a setscrew,

carefully note its position so that it can be re-assembled in the same position with the "Off Stop" properly set.

4.4.11 Remove the two screws holding the knob guard in place, and remove

the knob guard. (For earlier machines with the bar-type knob guard, the screws holding the guard assembly are accessible through the back of the flowmeter housing.)

4.4.12 Remove the screws holding the plexiglass cover over the flow tubes

and gauges, and carefully remove the cover.

4-11

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REPLACEMENT PROCEDURES (continued) NM2B

REAR VIEW OF

FLOWMETER HOUSING

WITH REAR COVER REMOVED

FRONT COVER RETAINER SCREWS

FLEXIBLE TUBING CONNECTION (PIPELINE PRESSURE GAUGES)

COMPRESSION FITTING (CYLINDER PRESSURE GAUGES)

GAUGE

MOUNTING

NUTS (TYPICAL)

SV40644

Figure 4-4: CYLINDER AND PIPELINE PRESSURE GAUGES

4-12

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

NOTE: Intermediateassemblies may need to be removed to allow

access to the gauge connections and mounting hardware. Be sure to keep a record of the disassembly sequence so that all tubing can be correctly re-assembled.

4.4.13A For the cylinder pressure gauges:

Disconnect the compression fitting at the back of the gauge. Remove the gauge mounting nuts, and remove the gauge from

the front of the panel. Install the replacement gauge in the panel using the flat

washers, lock washers and mounting nuts that were previously removed.

Connect the gas line to the gauge and tighten the compression fitting.

4.3.13B For the pipeline pressure gauges:

Locate the flexible tubing connecting the gauge to the pipeline inlet assembly, cut the tie-wrap tubing clamp at the pipeline inlet and disconnect the tubing.

NOTE: Onlater machines that have brass fittings instead

of nylon, the flex tubing is attached with a presson hose clamp instead of a tie strap.

Remove the gauge mounting nuts, and remove the gauge from the front of the panel.

Cut the tie-wrap tubing clamp and disconnect the flexible tubing from the gauge.

Connect a new 7-inch length of tubing (8-inch for the air pipeline pressure gauge) to the replacement gauge and secure it with a new tie-wrap clamp.

Place the gauge in the panel and secure it with the flat washers, lock washers and mounting nuts that were previously removed.

Rev. C

Connect the other end of the flexible tubing to the pipeline inlet assembly and secure it with a tie-wrap clamp.

4.4.14 If a cylinder pressure gauge was replaced, perform the following leak

test:

4-13

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REPLACEMENT PROCEDURES (continued) NM2B

4.4.14.1 Open the cylinder valve and check for a pressure indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must

contain the following minimum pressure: O

: 1000 PSI

O : 700 PSI

HE : 1000 PSI CO

: 800 PSI

AIR : 1000 PSI N O

: 1000 PSI

-He : 1000 PSI

4.4.14.2 Closethe cylinder valve and remove the cylinder from the yoke.

4.4.14.3 For any gas, the pressure should not drop more than 50 PSI in two minutes.

4.4.15 Reinstall the cylinder in the yoke.

4.4.16 Place the plexiglass cover over the gauges and flow tubes, and reinstall the cover screws. Do not over-tighten these screws as the plexiglass may crack.

4.4.17 Place the knob guard over the flow control valves and install its two retaining screws. (Reinstall the bar-type knob guard on earlier machines.)

4.4.18 Reinstall the O knob is installed properly, the O

flow control knob and tighten its setscrews. If the

label will be straight when the knob

is against its clockwise stop.

4.4.19 Replace the front plate at the top of the plexiglass cover and secure it with the hardware that was previously removed.

4.4.20 Replace the rear cover and its retaining screws.

4.4.21 Replace the table top and its retaining screws.

4.4.22 Connect the pipeline hoses.

4.4.23 Perform the PMS Procedure given in Section 6.

4-14

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.5 Flowmeters

The flowmeter tubes are held by compression in gaskets at the top and bottom of each tube. Each upper gasket is seated in an adjustable retainer that allows removal of the tube as shown in Figure 4-5. Access to the flow tubes and their retainers requires removal of the plexiglass cover on the gas instrumentation panel.

4.5.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.5.2 Close all cylinder valves except the O

valve.

4.5.3 Set the oxygen flow to 5 liters per min.

4.5.4 Open the other gas flow control valves to drain pressure from the system.

4.5.5 Close the O the O

Flush valve to drain oxygen pressure from the system.

cylinder valve, and close the flow control valves. Press

4.5.6 Set the System Power switch to STANDBY.

4.5.7 Remove the screws holding the table top to the machine and lift out the table top.

4.5.8 Early models: Remove the flowmeter housing rear cover.

4.5.9A Early models: Remove the two screws (from the back) holding the front plate at the top of the plexiglass cover. Hold the front plate as the screws are removed from the back.

4.4.9B Later models (without the O

O ratio alarm lamp): Remove the six

2/N2

screws holding the flowmeter shield and vapor box cover panel, and remove the panel.

Rev. A

4.5.10 Remove the O

flow control knob. The knob has two setscrews.

NOTE: If the knob must be rotated to allow access to a setscrew,

carefully note its position so that it can be re-assembled in the same position with the "Off Stop" properly set.

4.5.11 Remove the two screws holding the knob guard in place, and remove the knob guard. (For earlier machines with the bar-type knob guard, the screws holding the guard assembly are accessible through the back of the flowmeter housing.)

4.5.12 Remove the screws holding the plexiglass cover over the flow tubes and gauges, and carefully remove the cover.

4-15

FLOW TUBE

RETAINE R SC REW

UPPER FLOW

TUBE RETAINER

FLOW TUBE

LIGHTING CHANNEL

FLOW

RESTRICTOR

SV40605

GASKET

GUIDE RING

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REPLACEMENT PROCEDURES (continued) NM2B

Figure 4-5: FLOWMETERS

4-16

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.5.13 Loosen the screw directly above the flowmeter tube to be replaced. Turning the screw counter clockwise will raise the upper flow tube retainer. Raise the retainer far enough to be able to pull the top of the tube outward, and remove the tube.

NOTE: If the bottom of the tube is seated in a flow restrictor, be

sure that the arrangement of the restrictor and its gaskets is not disturbed.

4.5.14 Make sure that the replacement flow tube bears the correct markings and has a ball.

4.5.15 Place the bottom of the flowmeter tube into the guide ring of the lower gasket seal, and position the top of the flow tube into the center guide ring of the top gasket seal. It will be easier to hold the tube if the adjacent lighting channel is pulled forward and temporarily removed.

CAUTION: The flowmeter tube must be properly centered over the

guide rings or damage to the flowmeter tube may occur.

4.5.16 Ensure that the markings on the flow tube are facing forward, and turn the upper retainer screw clockwise until the flow tube is firmly held in place.

CAUTION: Do not over-tighten the screw as the flowmeter tube may

break.

4.5.17 Perform the following leak test on the system:

4.5.17.1 Disconnect the absorber hose from the freshgas outlet.

4.5.17.2 Connecta test gauge and B.P. bulb to the freshgas outlet,

and pressurize the system to 50 cm H

4.5.17.3 The pressure should not drop more than 10 cm H

Oin

thirty seconds.

4.5.18 Disconnect the test gauge and re-connect the absorber hose to the freshgas outlet.

Rev. A

4.5.19 Replace any lighting channels that were previously removed.

4-17

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REPLACEMENT PROCEDURES (continued) NM2B

4.5.20 Place the plexiglass cover over the gauges and flow tubes, and reinstall the cover screws. Do not over-tighten these screws as the plexiglass may crack.

4.5.21 Place the knob guard over the flow control valves and reinstall its two retaining screws. (Reinstall the bar-type knob guard on earlier machines.)

4.5.22 Reinstall the O knob is installed properly, the O

flow control knob and tighten its setscrews. If the

label will be straight when the knob

is against its clockwise stop.

4.5.23 Replace the front cover plate at the top of the plexiglass cover and secure it with the hardware that was previously removed.

4.5.24 If applicable, replace the flowmeter housing rear cover.

4.5.25 Replace the table top and its retaining screws.

4.5.26 Connect the pipeline hoses.

4.5.27 Perform the PMS Procedure given in Section 6.

4-18

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.6 Flow Control Valves

The flow control valves have replaceable elements that are removable from the front of the gas instrumentation panel as shown in Figure 4-6. Each flow control knob has a clockwise positive stop arrangement that prevents damage to the valve seat. Whenever a valve cartridge is replaced, the "off stop" must be set as outlined in the following procedure.

4.6.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.6.2 Close all cylinder valves except the O

valve.

4.6.3 Set the oxygen flow to 5 liters per min.

4.6.4 Open the other gas flow control valves to drain pressure from the system.

4.6.5 Close the O

Flush valve to drain oxygen pressure from the system.

cylinder valve and the O2flow control valve. Press the

4.6.6 Set the System Power switch to STANDBY.

4.6.7 Remove the O

flow control knob, and the knob on the valve to be

replaced.

4.6.8 Remove the two screws holding the knob guard in place, and remove the knob guard. (For earlier machines with the bar-type knob guard, the screws holding the guard assembly are accessible through the back of the flowmeter assembly.)

4.6.9 Remove the stop pin nut.

4.6.10 Remove the flow control valve by holding it at the wrench flats and turning it counter-clockwise.

Rev. A

4.6.11 Install the replacement flow control valve in the valve housing. CAUTION: Before tightening the cartridge, rotate the valve shaft

several turns counter-clockwise to prevent bottoming the valve element into the seat when the cartridge is tightened.

4.6.12 Replace the stop pin nut.

4.6.13 Replace the knob guard and secure it with the two mounting screws. (Replace the bar-type knob guard on earlier machines.)

4-19

VALVE

HOUSING

FLOW CO NT ROL VALVE

WRENCH

FLATS

KNOBLABEL

SV20606

STOP PIN NUT

KNOB GUARD

(NEW STYLE)

KNOB GUARD

(OLD STYLE)

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REPLACEMENT PROCEDURES (continued) NM2B

Figure 4-6: FLOW CONTROL VALVES

4-20

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.6.14 Set the System Power switch to ON.

4.6.15A For the O

flow control valve:

Open the oxygen cylinder valve. Turn the flow control valve clockwise until the flow rate will not

drop any further. (If the machine has been modified to eliminate the minimum flow feature, turn the valve until the flow rate is zero.)

4.6.15B For the other gas flow control valves:

Open the oxygen cylinder valve, and open the cylinder valve corresponding to the flow control valve replacement.

Set the oxygen flow rate to four liters per minute. Turn the other gas flow control valve clockwise until the flow

rate is zero.

4.6.16 Place the knob on the flow control valve shaft and turn it clockwise until it engages the stop pin. Tighten one of the knob setscrews.

4.6.17 Turn the knob in both directions and ensure that the flow can be controlled over its entire range. When the valve is closed, the knob should be against the clockwise stop. Tighten the remaining setscrew.

4.6.18 If the knob label is not horizontal when the valve is closed, remove the label and install a new label in the correct position.

4.6.19 Connect the pipeline hoses.

4.6.20 Perform the PMS Procedure given in Section 6.

Rev. A

4-21

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REPLACEMENT PROCEDURES (continued) NM2B

4.7 Oxygen Supply Pressure Failure Protection Device

The oxygen supply failure protection devices (failsafe assemblies) are located behind the gas instrumentation panel. Access to these assemblies requires removal of the rear cover. For earlier machines, replacement assemblies are supplied with all hardware out to the first compression fitting in each line.

On later machines with flowmeter assemblies having an Oxygen Ratio Controller (ORC), failsafe assemblies have an additional inlet port that allows both pipeline and cylinder supplies to be connected directly to the failsafe assemblies. Figure 4-7 shows the arrangement for both types of assemblies.

4.7.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.7.2 Close all cylinder valves except the O

valve.

4.7.3 Set the oxygen flow to 5 liters per min.

4.7.4 Open the other gas flow control valves to drain pressure from the system.

4.7.5 Close the O

Flush valve to drain oxygen pressure from the system.

cylinder valve and the O2flow control valve. Press the

4.7.6 Set the System Power switch to STANDBY.

4.7.7 Remove the screws holding the rear cover, and remove the cover.

4.7.8 Cut the tie-wrap clamp on the flexible O

control line, and disconnect

the flexible tube.

NOTE: On later machines with assemblies that have brass fittings instead

of nylon, the flex tubing is attached with a press-on hose clamp instead of a tie strap.

4.7.9 Disconnect the compression fittings at the side ports and at the check valve, and remove the assembly.

NOTE: If fittings must be installed in the replacement block assembly, use

Loctite #271 (red). See parts list in Section 8.

4.7.10 Install thereplacement failsafe assembly,and tightenall compression fittings.

4.7.11 Connect the flexible tubing to the control port, and install a new tiewrap clamp.

4-22

Rev. C

SV70101

O2 CONTROL LIN E

EARLIER DESIGN SUPPLIED

WITH FIT TIN GS

OXYGEN SUPPLY FAILURE PROTECT IO N DEVICE (N2O CONTROL DEVICE ILLUSTRATED)

OUTLE T

CYLINDER INLET

CHECK VALVE

PIPELINE INLET

CONNECTION

LATER DESIGN OF MAC HI NES

WITH FLOWMETER ASSEMBL IES

HAVING AN ORC

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-7: OXYGEN SUPPLY FAILURE PROTECTION DEVICE

Rev. J

4-23

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REPLACEMENT PROCEDURES (continued) NM2B

4.7.12 Perform the following test:

4.7.12.1 Open the cylinder valves.

4.7.12.2 Set the System Power switch to ON.

4.7.12.3 Set the oxygen flow to five liters per minute.

4.7.12.4 Set the other gas flow to five liters per minute.

4.7.12.5 Close the oxygen cylinder valve.

4.7.12.6 As the oxygen flow decreases, the other gas flow should

also decrease proportionally.

4.7.12.7 Set the System Power switch to STANDBY.

4.7.13 Replace the rear cover and its retaining screws.

4.7.14 Connect the pipeline hoses.

4.7.15 Perform the PMS Procedure given in Section 6.

4-24

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.8 Oxygen Supply Pressure Alarm Switch (earlier machines)

The oxygen supply pressure alarm switch is located behind the gas instrumentation panel. Access to the switch requires removal of the flowmeter housing rear cover. The replacement switch must be tested to ensure that its operating point is set correctly. Figure 4-8 shows the switch assembly on earlier machines where the switch is supported by the O

tubing.

On later machines with flowmeter assemblies having an Oxygen Ratio Controller (ORC), the oxygen supply pressure alarm switch is part of the alarm channel assembly. Refer to the procedure titled "Alarm Channel and Oxygen Supply Pressure Alarm Switch" for specific replacement instructions.

4.8.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.8.2 Close all cylinder valves except the O

valve.

4.8.3 Set the oxygen flow to 5 liters per min.

4.8.4 Open the other gas flow control valves to drain pressure from the system.

4.8.5 Close the O

Flush valve to drain oxygen pressure from the system.

cylinder valve and the O2flow control valve. Press the

4.8.6 Set the System Power switch to STANDBY.

4.8.7 Remove the screws holding the rear cover, and remove the cover.

4.8.8 Disconnect the two compression fittings at the TEE.

4.8.9 Note the position of the wires on the switch so that the replacement unit can be connected in the same manner. Disconnect the wires from the switch and remove the assembly.

4.8.10 Connect the wires to the replacement assembly; connect and tighten the compression fittings on the O

lines.

Rev. A

4.8.11 Remove the screws holding the table top to the machine and lift out the table top.

4.8.12 Pull the writing or keyboard tray out to its fully extended position.

4.8.13 Locate the TEE fitting in the ¼ in. diameter output line of the O regulator and remove the plug from the TEE fitting.

4.8.14 Connect a dedicated O

test gauge to the TEE fitting.

4-25

OXYGEN SUPPLY PRESSURE ALARM SWITCH

O LINES

ALARM WIRES

ADJUSTMENT

WHEEL

REAR VIEW, FLOWMETER HOUSING

WITH REAR COVER REMOVED

INCREASE

SETPOINT

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REPLACEMENT PROCEDURES (continued) NM2B

Figure 4-8: OXYGEN SUPPLY PRESSURE ALARM SWITCH

4-26

OSPAS

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.8.15 Open the oxygen cylinder valve and set the System Power switch to ON.

4.8.16 Set the oxygen flow to five liters per minute.

4.8.17 Close the oxygen cylinder valve.

4.8.18 As the pressure drops, the O

SUPPLY alarm should activate when

the pressure is between 40 and 34 psi as shown on the test gauge.

4.8.19 If the alarm activates when the pressure is below 34 psi, turn the adjustment wheel counter-clockwise, repeat the test and adjust as necessary to bring the set point into the correct range.

If the alarm activates when the pressure is above 40 psi, turn the adjustment wheel clockwise,repeat the test and adjust as necessary to bring the set point into the correct range.

4.8.20 Set the System Power switch to STANDBY.

4.8.21 Disconnect the test gauge and replace the plug in the regulator line TEE fitting.

4.8.22 Replace the table top and its retaining screws.

4.8.23 Replace the rear cover and its retaining screws.

4.8.24 Connect the pipeline hoses.

4.8.25 Perform the PMS Procedure given in Section 6.

Rev. A

4-27

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REPLACEMENT PROCEDURES (continued) NM2B

4.9 Oxygen Supply Pressure Alarm Whistle (Canada)

The oxygen supply pressure alarm whistle is located inside the flowmeter housing. Access to the whistle assembly requires removal of the flowmeter housing rear cover. Figure 4-9 shows the arrangement of the whistle assembly within the flowmeter housing, and indicates the compression fittings that need to be disconnected in order to remove the assembly.

4.9.1 Set the System Power switch to STANDBY, and remove AC power from the machine.

4.9.2 Close all cylinder valves and disconnect the pipeline hoses.

4.9.3 Press the O

FLUSH button to remove pressure from the oxygen

circuit.

4.9.4 Remove the screws holding the flowmeter housing rear cover, and remove the cover.

4.9.5 Disconnect the three compression fittings at the locations shown in the illustration, and remove the whistle assembly.

4.9.6 Position the replacement whistle assembly in the flowmeter housing, connect and tighten the three compression fittings.

4.9.7 Replace the flowmeter housing rear cover and its retaining screws.

4.9.8 Connect the pipeline hoses and perform the following test:

-- Set the System Power switch to ON.

-- Set the oxygen flow rate to 1 l/min.

-- Close the pipeline supply valve and observe the pipeline

pressure gauge.

-- The alarm whistle shall sound for a minimum of 10 seconds

when the pressure drops below the range of 35 to 30 PSI.

4.9.9 Perform the PMS Procedure given in Section 6.

4-28

Rev. A

REAR VIEW OF

FLOWMETER HOUSING (CANADA)

WITH COVER REMOVED

COMPRESSION FITTING

WHISTLE ASSEMBLY

COMPRESSION FITTING

SIDE VIEW

OF LOWER

COMPRESSION

FITTING

COMPRESSION FITTING

SV20324

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-9: OXYGEN SUPPLY PRESSURE ALARM WHISTLE (CANADA)

Rev. J

4-29

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REPLACEMENT PROCEDURES (continued) NM2B

4.10 Oxygen Ratio Monitor/Controller

The oxygen ratio monitor/controller (ORMC) is located in the vapor box and is accessible by removing the rear cover panel above the vaporizer mounts. Figure 4-10 shows the location of the ORMC mounting screws and connections. Test and adjustment instructions are included in the following procedure.

NOTE: Steps marked with an asterisk (*) do not apply to later model

machines that do not have the O

O ratio lamp on the alarm

2/N2

channel.

4.10.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.10.2 Close all cylinder valves except the O

valve.

4.10.3 Set the oxygen flow to 5 liters per min.

4.10.4 Open the other gas flow control valves to drain pressure from the system.

4.10.5 Close the O

Flush valve to drain oxygen pressure from the system.

cylinder valve and the O2flow control valve. Press the

4.10.6 Set the System Power switch to STANDBY.

4.10.7 Remove the four screws holding the vapor box rear cover, and remove the cover.

4.10.8 Remove the two screws holding the ORMC to the bottom of the vapor box.

4.10.9 Remove the four screws holding the bottom plate of the vapor box, and remove the plate to gain access to the ORMC connections.

4.10.10 Disconnect the flexible O disconnect the flexible N

tubing from the left side of the ORMC, and

O tubing from the right side of the MPL

switch. (Later models do not have the MPL switch.)

* 4.10.11 Cut the tie-wrap clamp on the in-line wiring harness connectors, and

separate the two ORMC connections.

4.10.12 While holding the ORMC, carefully disconnect the compression fittings on the N

4.10.13 Disconnect the remaining flexible N

O lines.

O tubing from the tee fitting at

the front of the ORMC. (Later models do not have the tee fitting.)

4-30

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

NARKOMED 4

REAR VIE W

O TUBING

O2 TUBING

MPL SWITCH ADJUSTMENT (TURN CLOCKWISE TO DECREA SE SETPOINT)

OXYGEN RATIO MONITOR/CONTROLLER

SWITC H MOUNT

SWITCH ADJUSTMENT CAM (TURN CLOCKWISE TO CLOSE CONTACTS)

N20

MOUNTING

BRACKET

CAM

SV40311

Figure 4-10: OXYGEN RATIO MONITOR/CONTROLLER

Rev. J

4-31

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REPLACEMENT PROCEDURES (continued) NM2B

4.10.14 Connect the flexible N

O tubing that was removed in the previous

step to the tee fitting at the front of the replacement ORMC, and secure the connection with a new tie strap clamp. (Later models do not have the tee fitting.)

4.10.15 Connect the copper N

O lines to the replacement ORMC and tighten

the compression fittings.

* 4.10.16 Join the in-line wiring harness to the replacement ORMC connectors

and install a new tie-wrap cable clamp.

4.10.17 Connect the flexible O connect the flexible N

tubing to the left side of the ORMC, and

O tubing to right side of the MPL switch.

Secure each connection with a press-on clamp. (Later models do not have the MPL switch.)

4.10.18 Open the O

and N2O cylinder valves.

4.10.19 Set the System Power switch to ON, and perform the following test:

4.10.19.1 Open the N

O flow control valve three turns. There

should be no nitrous oxide flow.

4.10.19.2 Slowly open the O

should start to flow when the oxygen flow is between 200 and 300 ml per minute.

4.10.19.3 Connect a calibrated oxygen monitor to the Freshgas

Outlet.

4.10.19.4 Adjust the oxygen flow to 1 liter per minute. The oxygen

concentration should be between 21% and 29% oxygen.

* 4.10.19.5 The yellow O

panel should be lighted.

4.10.19.6 Adjust the oxygen flow to 1.5 liters per minute. The

oxygen concentration should be between 21% and 29% oxygen.

* 4.10.19.7 The yellow O

panel should be lighted.

4.10.19.8 Adjust the oxygen flow to a point where the nitrous oxide

flowmeter indicates 10 liters per minute.

flow control valve. The nitrous oxide

O FLOW RATIO lamp on the alarm

2/N2

O FLOW RATIO lamp on the alarm

2/N2

4-32

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

* 4.10.19.9 The yellow O

O FLOW RATIO lamp on the alarm

2/N2

panel should be lighted.

4.10.19.10 Close the oxygen flow control valve. The nitrous oxide

flow should decrease proportionally, and the oxygen concentration should remain between 21% and 29% oxygen.

4.10.19.11 The nitrous oxide flow should stop when the flow of

oxygen is between 200 and 300 ml per minute.

4.10.19.12 Close the N

O flow control valve and set the System

Power switch to STANDBY. NOTE: If the ORMC is not working properly,

perform the adjustment procedure given in Section 5.

4.10.20 Replace the bottom plate of the vapor box. Be sure it is oriented correctly with the ORMC mounting holes in the correct position.

4.10.21 Secure the ORMC to the bottom of the vapor box with its two mounting screws.

4.10.22 Replace the rear cover of the vapor box.

4.10.23 Perform the PMS Procedure given in Section 6.

Rev. A

4-33

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REPLACEMENT PROCEDURES (continued) NM2B

4.11 Oxygen Ratio Controller (machines with E-Z Plumb piping)

The Oxygen Ratio Controller (ORC) is part of the N2O flowmeter sub-assembly and is located within the flowmeter housing. The ORC is accessible by removing the rear flowmeter housing cover. Figure 4-11 shows a typical ORC location and mounting arrangement, with a detail of the O-rings and filter.

The following procedure applies to both ORC designs: P/N 4111800, and Low Flow design P/N 4113229.

4.11.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.11.2 Close all cylinder valves except the O

valve.

4.11.3 Set the oxygen flow to 5 liters per min.

4.11.4 Open the other gas flow control valves to drain pressure from the system.

4.11.5 Close the O

Flush valve to drain oxygen pressure from the system.

cylinder valve and the O2flow control valve. Press the

4.11.6 Set the System, Power switch to STANDBY.

4.11.7 Remove the press-on clamp securing the flexible O

line to the ORC,

and carefully disconnect the tubing from the hose barb.

4.11.8 Remove the three screws holding the ORC to the flowmeter subassembly, and carefully remove the ORC from the flowmeter housing.

4.11.9 For low flow ORC (P/N 4113229) replacement, install the 6 in. length of flexible tubing with a blue N

O label on the replacement ORC (see

detail view in illustration) Secure each connection with a press-on hose clamp.

Position the replacement ORC at the back of the N assembly; be sure that its O-rings and filter are in place, and install its three mounting screws.

4.11.10 Connect the flexible O on hose clamp.

4.11.11 Open the O

and N2O cylinder valves.

4-34

O flowmeter sub-

line to the ORC and secure it with the press-

Rev. F

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NM2B REPLACEMENT PROCEDURES (continued)

REAR VIEW OF FLOWMETER HOUSING

WITH REAR COVER REMOVED

SV50504

ADJUSTING

SCREW

LOCKNUT

CONNECTION

ORC

ASSEMBLY

O-RING,

#105

(NEOPRENE)

Figure 4-11: OXYGEN RATIO CONTROLLER

Rev. J

FILTER

O-RING,

0.066 X 0.042 (BUNA-N)

ORC ASSEMBLY MOUNTING

SCREWS (3X)

DETAIL OF LOW FLOW

ORC ASSEMBLY WITH

6 IN. FLEXIBLE TUBING

4-35

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REPLACEMENT PROCEDURES (continued) NM2B

4.11.12 Perform the ORC adjustment procedure given in Section 5 of this manual.

NOTE: There are two adjustment procedures - one for ORC P/N 4111800,

and one for low flow ORC P/N 4113229. Be sure to follow the correct procedure.

4.11.13 Reinstall the flowmeter housing rear cover.

4.11.14 Perform the PMS Procedure given in Section 6.

4-36

Rev. F

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NM2B REPLACEMENT PROCEDURES (continued)

4.12 Vaporizers

Each vaporizer is held to the machine by two metric sized hex screws. These screws are accessible at the back of the vaporizer mount, below the interlock mechanism as shown in Figure 4-12. Before removing a vaporizer from the machine, it must be completely drained and dried in accordance with the procedure given below. Be sure to have a suitable packing or storage container available in which to place the vaporizer.

CAUTION: The following steps must be performed in the sequence given.

4.12.1 Set the System Power switch to ON.

4.12.2 Set all vaporizer handwheels to their Zero or OFF position. WARNING: Do not inhale anesthetic vapors as this could

result in personal injury.

4.12.3 Remove the filler and drain plugs, and drain the vaporizer into a suitable container. Dispose of the residual agent in an approved manner.

4.12.4 Turn the vaporizer handwheel to the maximum concentration setting.

4.12.5 Set the oxygen flow to 10 l/min. for at least 20 minutes. WARNING: This procedure must be performed in a well

ventilated area and without personnel present.

4.12.6 Turn the vaporizer handwheel to 0 (zero), and replace the filler and drain plugs.

4.12.7 Turn the oxygen flow off, and set the System Power switch to

STANDBY.

4.12.8 While holding the vaporizer, remove the mounting screws and carefully separate the vaporizer from the machine. Note the arrangement of gaskets so that the replacement vaporizer can be installed in the same manner.

4.12.9 Place the vaporizer in a suitable container for transport or storage.

Rev. A

WARNING: Do not tilt a vaporizer that contains anesthetic

agent more than 45 degrees. Failure to observe this precaution will render the handwheel calibration invalid.

4-37

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REPLACEMENT PROCEDURES (continued) NM2B

VAPORIZER MOUNT

INTERLOCK PIN

HANDWHEEL

VAPORIZER

VAPORIZER INTERLOCK MECHANISM REAR VIEW

LOCKING

NUT

SETSCREW

VAPORIZER

MOUNTING

SCREWS (2 EA)

(RECESSED)

SV20325

VAPORIZER MOUNTING SCREW LOCATIONS (2 EA)

RIGHT

SETSCREW

Figure 4-12: VAPORIZER INSTALLATION AND INTERLOCK ADJUSTMENT

4-38

LEFT

SETSCREW

CENTER

SETSCREWS

(RECESSED)

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

NOTE: Should a vaporizer containing anesthetic agent be

accidentally tilted more than 45 degrees, it must be drainedandflushed in accordancewithinstructions given in the manual supplied with the vaporizer.

4.12.10 Set the handwheel on the replacement vaporizer to its Zero position.

4.12.11 Installthe replacement vaporizer on the machine (be sure the O-rings are in place) and tighten the mounting screws to a torque of 24 to

26.5 inch pounds.

4.12.12 Perform the following test on the interlock mechanism and make any necessary adjustments:

4.12.12.1 Turn the center vaporizer handwheel ON. The left and

the right vaporizer handwheels should be locked in their Zero position. If the left or right vaporizer does not lock, tighten the corresponding center set screw until the handwheel locks properly.

4.12.12.2 Turn the center vaporizer OFF and turn the left

vaporizer ON. The center and the right vaporizer handwheels should be locked in their Zero position. If the right vaporizer does not lock, loosen the locking nut on the right set screw and adjust the set screw until the handwheel locks properly. Tighten the locking nut while holding the set screw to maintain the correct adjustment.

NOTE: Do not over-tighten the set screws. Each

vaporizer handwheel must turn easily while the other vaporizers are locked .

4.12.12.3 Turn the left vaporizer OFF and turn the right vaporizer

ON. The center and the left vaporizer handwheels should be locked in their Zero position. If the left vaporizer does not lock, loosen the locking nut on the left set screw and adjust the set screw until the handwheel locks properly. Tighten the locking nut while holding the set screw to maintain the correct adjustment.

4.12.13 Perform the PMS Procedure given in Section 6.

Rev. A

4-39

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REPLACEMENT PROCEDURES (continued) NM2B

4.13 O2 Flush Valve

The O2flush valve is located at the front of the machine next to the freshgas outlet. Access to the flush valve requires removal of the table top. Figure 4-13 shows the mounting and assembly details of the flush valve.

4.13.1 Set the System Power switch to STANDBY.

4.13.2 Disconnect all pipeline hoses.

4.13.3 Close the O

4.13.4 Press the O

cylinder valve.

Flush valve to drain oxygen pressure from the system.

4.13.5 Remove the screws holding the table top to the machine and lift out the table top.

4.13.6 Hold the O

Flush button in and rotate it until one of its set screws

are visible through the access hole in the guard ring, and loosen the set screw.

4.13.7 Turn the O

Flush button 180 degrees, hold it in and loosen the other

set screw.

4.13.8 Remove the O

Flush button and washer from the valve shaft.

4.13.9 Disconnect the two compression fittings at the valve. NOTE: Do not lose the flow restrictor located at the right-angle

fitting. This restrictor will be transferred to the replacement valve assembly.

4.13.10 The O

Flush valve is retained by the guard ring on the front of the

machine frame. Hold the body of the Clippard valve with an open end wrench; insert a rod or hex wrench through the holes in the guard ring (or use a spanner wrench), and un-screw the guard ring from the front of the frame rail.

4.13.11 Assemble the replacement O washer and guard ring through the frame and tighten the assembly, making sure that the valve is mounted straight.

4-40

Flush valve, spacer, internal tooth lock

Rev. A

COMPRESSION

FITTINGS

ACCESS

HOLES

PUSH

BUTTON

SPACER

GUARD RING

SET SCREWS

RESTRICTOR

WASHER

FRONT VIEW WITH

TABLE TOP REMOVED

O2 FLUSH VALVE

INTERNAL TOOTH LOCKWASHER

SV49099

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-13: O2FLUSH VALVE

Rev. J

4-41

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REPLACEMENT PROCEDURES (continued) NM2B

4.13.12 Connect the compression fittings to the valve. Be sure the flow restrictor is in place at the right-angle fitting.

4.13.13 Place the washer and the O

4.13.14 Hold the O

Flush button in and turn it until a set screw is visible

Flush button on the valve shaft.

through an access hole in the guard ring. Tighten the set screw. Rotate the button 180 degrees until the other set screw is visible, and tighten the set screw.

4.13.15 Disconnect the absorber freshgas hose from the freshgas outlet. Connect a test gauge and B.P. bulb to the freshgas outlet, and perform the following test:

4.13.15.1 Open the oxygen cylinder valve.

4.13.15.2 Release any pressure that is indicated on the test gauge.

4.13.15.3 Over the next 60 seconds, the test gauge should not show

a pressure increase greater than 2 cm H

4.13.15.4 Increase the pressure to 50 cm H

4.13.15.5 The pressure should not drop more than 10 cm H

Oin

the next 30 seconds.

4.13.15.6 Disconnect the test gauge from the freshgas outlet.

4.13.15.7 Open the oxygen cylinder valve and allow the pressure to

stabilize. (The cylinder pressure must be at least 1000 psi for this test.)

4.13.15.8 Close the oxygen cylinder valve.

4.13.15.9 The pressure should not drop more than 50 psi in two

minutes.

4.13.15.10 Connect a volumeter to the freshgas outlet, and reset the

volumeter to zero.

4.13.15.11 Press the O

Flush button and observe the flow rate. It

should be between 45 and 65 liters per minute.

4.13.15.12 Disconnect the volumeter from the freshgas outlet.

4-42

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.13.16 Connect the absorber freshgas hose to the freshgas outlet.

4.13.17 Replace the table top and secure it with the mounting screws.

4.13.18 Connect the pipeline hoses.

4.13.19 Perform the PMS Procedure given in Section 6.

Rev. A

4-43

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REPLACEMENT PROCEDURES (continued) NM2B

4.14 AV-E Ventilator Controller Assembly

The ventilator controller assembly is located in the left side of the ventilator box. Access to the controller requires removing the front panel from the ventilator box. Figure 4-14 shows the mounting screw locations and cable connections to the ventilator controller.

4.14.1 Set the System Power switch to STANDBY.

4.14.2 Remove the four screws holding the ventilator box front panel. Remove the panel and carefully separate the ventilator switch in-line connector.

4.14.3 Remove the two screws holding the ventilator controller assembly to the floor of the ventilator box.

4.14.4 Pull the controller assembly forward and disconnect the two cables from J1 and J2 at the back of the assembly, and remove the controller assembly.

4.14.5 Plug the cables that were previously removed into J1 and J2 on the back of the replacement controller assembly.

4-44

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

VENTILATOR BOX TOP VIEW

SV20327

VENTILATOR CONTROLLER ASSEMBLY

VENTILATOR BOX FRONT PANEL SCREWS (6)

VENTILATOR BOX

FRONT PANEL

IN-LINE

CONNECTOR

VENTILATOR

SWITCH

VENTILATOR

CONTRO LLER ASSEMBLY

MOUNTING SCREW S

Figure 4-14: VENTILATOR CONTROLLER ASSEMBLY

Rev. J

4-45

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REPLACEMENT PROCEDURES (continued) NM2B

4.14.6 Mount the replacement controller assembly to the floor of the ventilator box and secure it with the two mounting screws.

4.14.7 Join the ventilator switch in-line connector, and replace the front panel of the ventilator box.

4.14.8 Perform the PMS Procedure given in Section 6.

4-46

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.15 AV-E Ventilator Solenoid Valve

The ventilator solenoid valve is located in the ventilator box and is mounted on the inner back wall of the box. Replacement of the solenoid valve requires lifting the monitor box to gain access to its mounting and connections. Figure 4-15 shows the mounting location, electrical connections and tubing arrangement of the solenoid valve.

4.15.1 Set the System Power switch to STANDBY and remove AC power from the machine.

4.15.2 Remove the screws holding the monitor box to the ventilator box. WARNING: Two people are required to perform the remaining

portion of this procedure.

4.15.3 Raise the rear left side of the monitor box chassis approximately two inches, and prop the box open.

WARNING: Ensure that AC power is removed from the

machine before raising the monitor box. Failure to observe this precaution may cause injury by electric shock.

4.15.4 Remove the two screws holding the safety cover over the AC power filter, and remove the cover.

4.15.5 Remove the two screws holding the solenoid valve to the inner wall of the ventilator box.

Rev. A

4-47

XXX

XXX.

XXX

AC POWER FILTER COVER

COVER SCREWS

VENTILATOR SOLENOID VALVE

MOUNTING SCREWS (2)

VENTILATOR

SOLENOID VALVE

VENTILATOR BOX TOP VIEW

SV20328

OUTPUT PORT

INPUT

PORT

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REPLACEMENT PROCEDURES (continued) NM2B

Figure 4-15: VENTILATOR SOLENOID VALVE

4-48

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.15.6 Remove the prop from the rear left side of the monitor box, and return the box to its normal position.

4.15.7 Raise the front of the monitor box approximately four inches, and prop the box open.

4.15.8 Pull the solenoid valve forward to gain access to its connections, and remove the electrical connections.

4.15.9 Remove the three flexible tubing connections and remove the solenoid valve. Mark each tube so that the replacement solenoid can be connected in the same manner.

4.15.10 Connect the flexible tubing to the replacement solenoid valve.

4.15.11 Connect the two wires to the solenoid, and place the solenoid near its mounting position.

4.15.12 Remove the prop from the front of the monitor box and lower the box to its original position.

4.15.13 Raise the rear of the monitor box chassis approximately two inches, and prop the box open.

4.15.14 Mount the solenoid valve to the ventilator box using the original hardware.

4.15.15 Replace the safety cover over the AC power filter and secure it with the two screws.

4.15.16 Remove the prop from the rear of the monitor box, and return the box to its normal position.

4.15.17 Replace the screws holding the monitor box to the ventilator box.

4.15.18 Restore power to the machine and perform the PMS Procedure given in Section 6.

Rev. A

4-49

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REPLACEMENT PROCEDURES (continued) NM2B

4.16 AV-2 Ventilator Controller Assembly

The Ventilator Controller assembly is attached to the left front panel of the ventilator box and includes electrical and pneumatic components. Figure 4-16 shows the mounting screw locations and connections to the ventilator controller. Flexible tubing allows the assembly to be pulled from the front of the ventilator box without raising the monitor box.

4.16.1 Set the System Power switch to STANDBY and remove AC power from the machine.

4.16.2 Disconnect all pipeline hoses and close all cylinder valves.

CAUTION: The controller circuit boardcontains static sensitive devices. Use

ESD protection when handling the controller assembly.

4.16.3 Remove the two screws securing the left end of the ventilator controller panel.

4.16.4 Pull the left side of the panel outward, slide it to the left until the locking tab on the right side of the panel is clear of its receptacle, then pull the assembly out far enough to gain access to its connections.

4.16.5 Disconnect the alarm channel wiring harness from J2 on the controller circuit board.

4.16.6 Disconnect the following large and small diameter pneumatic tubing (the letters are keyed to the illustration):

A: Small dia. tube from solenoid to rear vent fitting on bellows box B: Large dia. tube from supply valve to venturi C: Small dia. tube to auto-ranging valve D: Large dia. tube from main switch (O

supply)

4.16.7 Remove the controller assembly from the machine.

4.16.8 Position the replacement controller assembly in the ventilator box and reconnect the four pneumatic lines.

4.16.9 Reconnect the alarm channel wire harness to J2 on the controller circuit board.

4-50

Rev. A

SV50509

O2 SUPPLY

TO VENTURI

TO VENT

RETAINING

SCREWS (2X)

SUPPLY VALVE

SOLENOID

CONTROLLER ASSEMBLY

TOP VIEW OF CONTROLLER

ASSEMBLY

IN VENTILATOR

BOX

J2 GAUGE

ON-OFF

SWITCH

INSPIRATORY

FLOW

REGULATOR

TO AUTO-

RANGING VALVE

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NM2B REPLACEMENT PROCEDURES (continued)

Figure 4-16: AV-2 VENTILATOR CONTROLLER ASSEMBLY

Rev. J

4-51

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REPLACEMENT PROCEDURES (continued) NM2B

4.16.10 Slide the controller into the ventilator box, carefully fit the locking tab into its receptacle at the right side of the panel, and slide the assembly to the right until it is properly seated.

4.16.11 Reinstall the two retaining screws at the left side of the panel.

4.16.12 Perform the PMS Procedure given in Section 6.

4-52

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.17 Convenience Outlet AC Power Filter

The convenience outlet AC power filter is located in the back of the ventilator box near the AC convenience outlets. Access to the power filter requires lifting the monitor box. Figure 4-17 shows the location of the filter, its connections and its mounting arrangement.

4.17.1 Set the System Power switch to STANDBY and remove AC power from the machine.

4.17.2 Remove the screws holding the monitor box to the ventilator box. WARNING: Two people are required to perform the remaining

portion of this procedure.

4.17.3 Raise the rear of the monitor box chassis approximately two inches, and prop the box open.

WARNING: Ensure that AC power is removed from the

machine before raising the monitor box. Failure to observe this precaution may cause injury by electric shock.

4.17.4 Remove the two screws holding the safety cover over the AC power filter, and remove the cover.

4.17.5 Disconnect the AC wiring from each side of the filter. Note the position of the wires so they can be re-installed in the same manner.

Rev. A

4-53

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REPLACEMENT PROCEDURES (continued) NM2B

VENTILATOR BOX TOP VIEW

FILTER MOUNTING SPACERS (2X)

AC POWER FILTER COVER

BLACK WHITE

CONVENIENCE OUTLET AC

POWER FILTER

BROWN GREEN/YELLOW BLUE

COVER

SCREWS

Figure 4-17: CONVENIENCE OUTLET AC POWER FILTER

4-54

SV20331

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.17.6 Unscrew the two hex post nuts holding the filter to the ventilator box, and remove the filter.

4.17.7 Install the replacement filter and secure it with the two hex post nuts.

4.17.8 Connect the AC wiring to the replacement filter. Be sure to observe the wire color code as illustrated.

4.17.9 Place the safety cover over the filter and secure it with the two screws.

4.17.10 Remove the prop from the rear of the monitor box, and return the box to its normal position.

4.17.11 Replace the screws holding the monitor box to the ventilator box.

4.17.12 Restore power to the machine and perform the PMS Procedure given in Section 6.

Rev. A

4-55

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REPLACEMENT PROCEDURES (continued) NM2B

4.18 AV-E Inspiratory Flow Regulator

The inspiratory flow regulator is located in the ventilator box. Access to the regulator requires removal of the ventilator box front panel, and lifting the monitor box. Figure 4-18 shows the regulator mounting arrangement and its connections.

4.18.1 Set the System Power switch to STANDBY.

4.18.2 Remove the four screws holding the ventilator box front panel. Remove the panel and carefully separate the ventilator switch in-line connector.

4.18.3 Remove the screws holding the monitor box to the ventilator box. WARNING: Two people are required to perform the remaining

portion of this procedure.

4.18.4 Raise the front of the monitor box chassis approximately four inches, and prop the box open.

WARNING: Ensure that AC power is removed from the

machine before raising the monitor box. Failure to observe this precaution may cause injury by electric shock.

4.18.5 Disconnect the two compression fittings at the regulator.

4.18.6 Remove the tie strap securing the small diameter flex tubing to the hose barb on the flow regulator assembly, and disconnect the tubing.

4.18.7 Un-screw the retaining ring holding the regulator to its mounting bracket, and remove the regulator.

4.18.8 Install the replacement regulator in the mounting bracket and tighten the mounting ring.

4.18.9 Connect the two compression fittings to the regulator.

4.18.10 Reattach the small diameter flex tubing previously removed from the regulator assembly and secure the connection with a tie strap.

4.18.11 Remove the prop from the front of the monitor box, and return the box to its normal position.

4.18.12 Replace the four screws holding the monitor box to the ventilator box.

4-56

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NM2B REPLACEMENT PROCEDURES (continued)

VENTILATOR BOX TOP VIEW

COMPRESSION FITTING

REGULATOR MOUNTING NUT

VENTILATOR BOX FRONT PANEL SCREWS (4)

HOSE BARB

FITTING

COMPRESSION

FITTING

INSPIRATORY

FLOW

REGULATOR

SV20341

Figure 4-18: INSPIRATORY FLOW REGULATOR

Rev. J

4-57

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REPLACEMENT PROCEDURES (continued) NM2B

4.18.13 Join the ventilator switch in-line connector, and replace the front panel of the ventilator box.

4.18.14 Perform the PMS Procedure given in Section 6.

4-58

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NM2B REPLACEMENT PROCEDURES (continued)

4.19 Ventilator Bellows Valve and Guide Assembly (AV-E Ventilator)

The ventilator bellows valve and guide assembly is located in the bellows box on the left side of the machine. Access to the valve case and guide assembly requires that the bellows box front panel and the bellows canister be removed from the bellows box. The monitor box will also need to be raised for access to a connection inside the ventilator box.

Replacement Procedure 1 applies to machines with a two-piece tidal volume adjustment and valve case assembly inside the bellows box. Figure 4-19 shows the mounting and tubing arrangement.

Replacement Procedure 2 applies to machines with a one-piece tidal volume adjustment and valve case assembly inside the bellows box. Figure 4-19A shows the mounting and tubing arrangement for assemblies with either a Humphrey or a Clippard valve.

Replacement Procedure 1:

4.19.1 Set the System Power switch to STANDBY, remove AC power from the machine, and disable all circuit breakers.

4.19.2 Close all cylinder valves, and disconnect the pipeline hoses from the machine.

4.19.3 Press the O

FLUSH button to relieve pressure from the system.

4.19.4 Adjust the TIDAL VOLUME knob to fully extend the volume indicator to its minimum setting.

4.19.5 Disconnect the bellows hose and the scavenger hose from the bellows assembly. Loosen the wingnuts and remove the bellows assembly.

4.19.6 Remove the canister from the bellows box by pulling it downward.

4.19.7 Remove the screws holding the front panel and tidal volume adjustment knob, and remove the panel. The knob assembly remains with the panel. On machines with a two-piece panel, remove the angle plate above the knob panel. (Some older machines may have a non-removable panel above the bellows adjustment knob.)

Rev. A

4.19.8 Remove the four socket head screws securing the valve case assembly to the bellows top plate.

4.19.9 Carefully cut the tie strap at the exhaust port (front of valve) and remove the large hose.

4-59

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REPLACEMENT PROCEDURES (continued) NM2B

VENTILATOR BOX

INSIDE TOP VIEW

COMPRESSION

FITTING

VENTILATOR BOX

AND BELLOWS BOX

FRONT VIEW

BELLOWS ASSEMBLY

COPPER TUBE

FRONT PANEL

MOUNTINGSCREWS (4X)

FRONT PANEL AND TIDAL

VOLUME ADJUSTMENT KNOB

Figure 4-19: TWO-PIECE TIDAL VOLUME ADJ. & VALVE CASE ASSEMBLY

4-60

SV20332

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

BELLOWS BOX FRONT VIEW

WITH PANEL REMOVED

TIE STRAP

EXHAUST

INTAKE

TIE STRAP

SV20312

COPPER

TUBE

MINIATURE ACTUATOR

VALVE CASE

ASSEMBLY

VALVE CASE ASSEMBLY

MOUNTING SCREWS (4X)

Figure 4-19: TWO-PIECE TIDAL VOLUME ADJ. & VALVE CASE ASSEMBLY (continued)

Rev. A

4-61

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REPLACEMENT PROCEDURES (continued) NM2B

4.19.10 Carefully cut the tie strap and remove the other end of the large hose at the top of the muffler interface wall.

4.19.11 Remove the three socket head screws securing the bellows top plate to the bellows box.

4.19.12 Carefully cut the tie strap at the intake port (rear of valve) and remove the large hose.

4.19.13 Disconnect the small diameter tubing from the hose barb on the bottom of the miniature actuator.

4.19.14 Remove the screws holding the monitor box to the ventilator box. WARNING: Two people are required to perform the remaining

portion of the procedure.

4.19.15 Raise the front of the monitor box chassis approximately four inches, and prop the box open.

WARNING: Ensure that AC power is removed from the

machine before raising the monitor box. Failure to observe this precaution may cause injury by electric shock.

4.19.16 Disconnect the compression fitting at the outboard end of the copper tube from the valve case assembly, and remove the valve case assembly.

4.19.17 Carefullyposition the replacement valve case assembly in the bellows box, with the copper tube extending up into the ventilator box, and connect the compression fitting in the ventilator box.

4.19.18 Connect the small diameter tubing to the hose barb on the bottom of the miniature actuator and secure the connection with a press-on clamp.

4.19.19 Attach the large hose to the intake port of the new valve case assembly and secure it with a new tie strap.

4.19.20 Secure the valve case assembly to the bellows top plate with the four screws that were previously removed. Be sure that the two O-rings in the bellows top plate are properly seated.

4.19.21 Secure the bellows top plate to the bellows box using the three screws that were previously removed.

4-62

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

4.19.22 Attach the large hose from the muffler interface wall and secure the connection with a new tie strap.

4.19.23 Attach the other large hose to the exhaust port on the valve case assembly and secure the connection with a new tie strap.

4.19.24 Remove the prop from the monitor box and carefully lower it into position. Replace the screws holding the monitor box to the ventilator box.

4.19.25 Place the bellows box front panel into position, ensure that the slot in the knob assembly is correctly aligned with the drive pin on the bellows adjustment shaft, and install the four screws holding the front panel to the machine.

4.19.26 Reattach the canister to the bellows box.

4.19.27 Reattach the bellows assembly and tighten the wingnuts holding it in place. Connect any hoses that were previously removed from the bellows assembly.

4.19.28 Reconnect the pipeline hoses and AC power cord, and reset all circuit breakers.

4.19.29 Perform the PMS Procedure given in Section 6.

Rev. A

4-63

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REPLACEMENT PROCEDURES (continued) NM2B

Replacement Procedure 2:

4.19.30 Set the System Power switch to STANDBY, remove AC power from the machine, and disable all circuit breakers.

4.19.31 Close all cylinder valves, and disconnect the pipeline hoses from the machine.

4.19.32 Press the O

FLUSH button to relieve pressure from the system.

4.19.33 Adjust the TIDAL VOLUME knob to fully extend the volume indicator to its minimum setting.

4.19.34 Disconnect the bellows hose and the scavenger hose from the bellows assembly. Loosen the wingnuts and remove the bellows assembly and the canister.

4.19.35 Remove the canister from the bellows box by pulling it downward.

4.19.36 Remove the screws holding the front panel and tidal volume adjustment knob, and remove the panel. The knob assembly remains with the panel. On machines with a two-piece panel, remove the angle plate above the knob panel.

4.19.37 Remove the screws holding the monitor box to the ventilator box. WARNING: Two people are required to perform the remaining

portion of the procedure.

4.19.38 Raise the front of the monitor box chassis approximately four inches, and prop the box open.

WARNING: Ensure that AC power is removed from the

machine before raising the monitor box. Failure to observe this precaution may cause injury by electric shock.

4.19.39 Remove the bellows guide by unscrewing its stem from the bellows adjustment rod.

4.19.40 Remove the volume indicator from the bellows adjustment rod by loosening its two set screws. Note the position of the indicator on the rod so that it can be reassembled in the same manner.

4.19.41 Remove the screws securing the muffler access panel at the rear of the bellows box, and remove the panel.

4-64

Rev. A

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NM2B REPLACEMENT PROCEDURES (continued)

VENTILATOR BOX

INSIDE TOP VIEW

VENTILATOR SOLENOID "OUT" PORT

COMPRESSION

FITTING

VENTILATOR BOX

AND BELLOWS BOX

FRONT VIEW

BELLOWS GUIDE

BELLOWS ASSEMBLY

COPPER TUBE

FRONT PANEL

MOUNTING SCREWS (4X)

FRONT PANEL AND TIDAL

VOLUME ADJUSTMENT KNO B

VOLUME INDICATOR

SET SCREWS (2X)

VOLUME INDICATOR

Figure 4-19A: ONE-PIECE TIDAL VOLUME ADJ. & VALVE CASE ASSEMBLY

Rev. J

4-65

SV20333

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REPLACEMENT PROCEDURES (continued) NM2B

INTAKE HOSE

EXHAUST HOSE

HOSE CLAMP (2X)

BELLOWS TOP PLATE MOUNTING SCREWS (3X)

ASSEMBLY WITH

CLIPPARD VALVE

BELLOWS BOX

INSIDE TOP VIEW

ASSEMBLY WITH

HUMPHREY VALVE

COPPER T UBE

BELLOWS ADJUSTING ROD TUBE

BELLOWS VAL V E AND GUIDE ASSEMBLY

BELLOWS TOP PLATE

VALVE AND GUIDE ASSEMBLY MOUNTING SCREWS (2X)

BELLOWS BOX FRONT VIEW

WITH PANEL REMOVED

TO VENTILATOR

SOLENOID

TO VENTILATOR

SOLENOID

SV45016

Figure 4-19A: ONE-PIECE TIDAL VOLUME ADJ. & VALVE CASE ASSEMBLY (continued)

4-66

Rev. J

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NM2B REPLACEMENT PROCEDURES (continued)

4.19.42 Remove the muffler/silencer (white tube) from the intake flange at the interface wall by turning the muffler counter-clockwise.

4.19.43 Disconnect the press-on clamp and small diameter tubing from the left side hose barb on the ventilator solenoid valve (port labeled "out").

4.19.44 Disconnect the compression fitting at the outboard end of the copper tube from the valve case assembly.

4.19.45 Unscrew the bellows adjustment rod tube from the top of the assembly. Do not misplace the spacer ring.

4.19.46 Pull the bellows adjustment rod up.

4.19.47 Remove the two screws securing the valve case and guide assembly to the bellows top plate.

NOTE: Be careful not to misplace the two O-rings and the spacer

ring under the valve case assembly.

4.19.48 Pull both large diameter tubes forward until they clear the muffler housing interface wall.

4.19.49 Rotate the valve case and guide assembly as needed in order to withdraw it from the bellows box.

CAUTION: Do not damage any of the fittings or small hose barbs on

the assembly during its removal.

4.19.50 Transfer the large diameter tubing and hose clamps to the intake and exhaust ports on the replacement valve case and guide assembly.

4.19.51 Carefully position the replacement valve case and guide assembly in the bellows box, with the copper tube extending up into the ventilator box, and with the intake and exhaust hoses correctly positioned in the muffler housing interface wall.

4.19.52 Secure the valve case assembly to the bellows top plate with the two screws that were previously removed. Be sure that the spacer ring and the two O-rings in the bellows top plate are properly seated.

Rev. A

4-67

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REPLACEMENT PROCEDURES (continued) NM2B

4.19.53 Connect the copper tube to the tee fitting in the ventilator box.

4.19.54 Install the spacer ring and bellows adjustment rod tube at the top of the valve case and guide assembly.

4.19.55 Attach the small diameter tubing from the miniature actuator to the left side hose barb on the ventilator solenoid valve (port labeled "out"), and secure the connection with a press-on clamp.

NOTE: After the connection is made, ensure that there are no

kinks or sharp bends in the tubing.

4.19.56 Reattach the muffler/silencer to the intake flange at the muffler housinginterface, and reattach the rear access panel using the screws that were previously removed.

4.19.57 Install the volume indicator on the bellows adjustment rod in the same position as before disassembly, and tighten its two setscrews.

4.19.58 Install the bellows guide by screwing its stem into the bellows adjustment rod. Secure it with #222 (purple) Loctite.

4.19.59 Remove the prop from the monitor box and carefully lower it into position. Replace the screws holding the monitor box to the ventilator box.

4.19.60 Place the bellows box front panel into position, ensure that the slot in the knob assembly is correctly aligned with the drive pin on the bellows adjustment shaft, and install the four screws holding the front panel to the machine.

4.19.61 Replace the bellows assembly and tighten the wingnuts holding it in place. Connect any hoses that were previously removed from the bellows assembly.

4.19.62 Reconnect the pipeline hoses and AC power cord, and reset all circuit breakers.

4.19.63 Perform the PMS Procedure given in Section 6.

4-68

Rev. A

Dräger Narkomed 2B Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 Recommendations

2.0 DIAGNOSTICS

2.1 Service Menu Screen

2.1.1 Diagnostics Menu Screen

2.1.2 Calibration Menu Screen

3.0 TROUBLESHOOTING

3.1 Power Supply and Voltage Distribution

3.2 Battery

3.3 Troubleshooting Guides

4.0 REPLACEMENT PROCEDURES

4.1 Cylinder Yoke Assemblies

4.2 Cylinder Pressure Regulators

4.3 Cylinder Cutoff Valves (Canada)

4.4 Cylinder and Pipeline Pressure Gauges

4.5 Flowmeters

4.6 Flow Control Valves

4.7 Oxygen Supply Pressure Failure Protection Device

4.8 Oxygen Supply Pressure Alarm Switch (earlier machines)

4.9 Oxygen Supply Pressure Alarm Whistle (Canada)

4.10 Oxygen Ratio Monitor/Controller

4.11 Oxygen Ratio Controller (machines with E-Z Plumb piping)

4.12 Vaporizers

4.13 O2 Flush Valve

4.14 AV-E Ventilator Controller Assembly

4.15 AV-E Ventilator Solenoid Valve

4.16 AV-2 Ventilator Controller Assembly

4.17 Convenience Outlet AC Power Filter

4.18 AV-E Inspiratory Flow Regulator

4.19 Ventilator Bellows Valve and Guide Assembly (AV-E Ventilator)