VersaMed iVent201 User manual

iVent201
Service Manual
Part No. SM-01-04 Rev. 5 Revised February 2006
© 2006 VersaMed
0473

All Rights Reserved. No part of this document may be photocopied,
reproduced, stored in a retrieval system, or transmitted, in any form
or by any means, electronic, mechanical, or otherwise without the
prior written permission of VersaMed.
No warranty of accuracy is given concerning the contents of the
information contained in this publication. To the extent permitted
by law no liability (including liability to any person by reason of
negligence) will be accepted by VersaMed, its subsidiaries or
employees for any direct or indirect loss or damage caused by
omissions from or inaccuracies in this document.
VersaMed reserves the right to change details in this publication
without notice.
Adaptive Flow®and Adaptive Time®are registered trademarks of
VersaMed.
SAFETY: Before attempting to service or test the iVent
201
ventilator please
read this manual and the Operator's Manual in their entirety to
familiarize yourself with all Cautions and Warnings.
Manufacturer’s Address
VersaMed Medical Systems Inc.
2 Blue Hill Plaza Bldg. 2
Pearl River, NY 10965
845-770-2840
Authorized Representative in the European Community
Obelis S.A.
Avenue de Tervuren 34, Bte 44
B-1040 Brussels
Belgium
+32-2-732-59.54
Fax: [phone]

Calling For Help
If you have a ventilator problem that you cannot solve and you purchased
your ventilator directly from VersaMed, call:
800-475-9239 Customer Care and Service Assistance Line
or
866-483-6820 (866-iVent201)
If you have a ventilator problem that you cannot solve and you purchased
your ventilator from an authorized VersaMed distributor, please contact
your distributor directly to report the problem.
NOTE: If this ventilator has not been purchased directly from VersaMed, please
ensure that it has been purchased from an authorized distributor of
VersaMed. To obtain a list of authorized distributors contact VersaMed at
[email protected].
visit our website: www.versamed.com

Table of Contents
Section 1: Introduction................................................. 21
1.1 Intended Use .................................................................................... 21
1.2 General Description......................................................................... 22
1.3 Safety Information ........................................................................... 23
1.3.1 Safety Regulations................................................................................24
1.3.2 Technician Safety..................................................................................24
1.3.2.1 Hazard Notices .............................................................................24
1.3.2.2 Calibration and Verification Test ...............................................24
1.3.2.3 Handling PC Boards ....................................................................24
1.3.3 Important Safety Considerations .......................................................25
1.4 Labels and Symbols ........................................................................ 26
1.4.1 Symbols..................................................................................................26
1.4.2 Labels .....................................................................................................27
Section 2: System Specifications................................ 31
2.1 Specifications................................................................................... 31
2.1.1 Ventilation Modes ................................................................................31
2.1.2 Ventilation Performance and Controlled Parameters.....................31
2.1.3 Power Supply........................................................................................32
2.1.4 Oxygen Supply .....................................................................................32
2.1.5 Size and Weight....................................................................................32
2.1.6 Environmental Specifications .............................................................33
2.2 Standards and Safety Requirements ............................................. 33
2.3 Monitoring and Displayed Parameters........................................... 34
2.4 Adjustable Non-Displayed Parameters .......................................... 35

2.5 User Adjustable Alarms ...................................................................35
2.6 Additional Alarms and Indicators ...................................................36
2.6.1 Alarms ................................................................................................... 36
2.6.2 Indicators and Icons ............................................................................ 36
Section 3: Installation and Setup................................. 37
3.1 External Electrical Supply ...............................................................37
3.2 Internal Battery .................................................................................38
3.2.1 Battery Charging.................................................................................. 38
3.2.2 Internal Battery Charge Level Indicator........................................... 39
3.3 Oxygen Supply .................................................................................39
3.3.1 High Pressure Supply ......................................................................... 39
3.3.2 Low Pressure Oxygen Supply ........................................................... 40
3.4 Patient Circuit ...................................................................................41
3.4.1 Patient Circuit Connection ................................................................. 43
3.5 Filters ................................................................................................44
3.5.1 Air Inlet Filter....................................................................................... 44
3.5.1.1 Low Pressure Oxygen Adapter and Filter................................ 45
3.5.1.2 CBRN Filter................................................................................... 45
3.5.1.3 Bacterial Filter............................................................................... 45
3.6 Ventilator Controls ...........................................................................47
3.6.1 Rotational Control Knob (Encoder) .................................................. 47
3.6.2 Keypad .................................................................................................. 47
3.6.3 LED Indicators ..................................................................................... 48
3.7 Ventilator Operation.........................................................................48
Section 4: Theory of Operation.................................... 49
4.1 Pneumatic Unit .................................................................................49

4.1.1 Blower Assembly (Turbine)................................................................52
4.1.2 Oxygen Blending System ....................................................................52
4.1.2.1 O
2
Pressure Switch .......................................................................53
4.1.2.2 Demand Valve ..............................................................................53
4.1.2.3 Proportioning Valve.....................................................................53
4.1.2.4 Valve Controller............................................................................54
4.1.2.5 Valve Limit Switch (O
2
Microswitch)........................................54
4.1.2.6 Oxygen Sensor ..............................................................................54
4.1.3 Solenoid Valve System ........................................................................55
4.1.4 Filters and Mufflers..............................................................................56
4.1.5 Cooling Fan ...........................................................................................57
4.1.6 Patient Circuit .......................................................................................57
4.1.6.1 Wye and Flow Sensor ..................................................................57
4.1.6.2 Exhalation Valve...........................................................................57
4.1.6.3 One-way Valve..............................................................................58
4.2 Electronic Module ............................................................................ 59
4.2.1 Computer...............................................................................................61
4.2.1.1 System Memory ............................................................................61
4.2.1.2 BIOS ................................................................................................61
4.2.1.3 DiskOnChip®................................................................................61
4.2.1.4 RS-232.............................................................................................62
4.2.1.5 VGA Display .................................................................................62
4.2.1.6 Keyboard........................................................................................62
4.2.1.7 Ethernet..........................................................................................62
4.2.1.8 PC Watchdog.................................................................................63
4.2.1.9 Operating System (OS) ................................................................63
4.2.2 Main Board............................................................................................63
4.2.2.1 Sensors Interface ...........................................................................64
4.2.2.1.1 Flow Sensor............................................................................64
4.2.2.1.2 Pressure Sensors....................................................................64
4.2.2.1.3 Oxygen Sensor.......................................................................64
4.2.2.1.4 Temperature Sensor .............................................................65

4.2.2.1.5 Battery Voltage ..................................................................... 65
4.2.2.2 Digital/Analog Interface ............................................................ 65
4.2.2.3 Control and Status ....................................................................... 65
4.2.2.4 Motor Interface............................................................................. 65
4.2.2.5 Bus Interface ................................................................................. 66
4.2.2.6 Solenoids Interface....................................................................... 66
4.2.2.7 Stepper Interface .......................................................................... 66
4.2.2.8 Watchdog Timer........................................................................... 66
4.2.2.9 Remote Alarm............................................................................... 67
4.2.2.10 SpO2............................................................................................. 67
4.2.3 Zeroing/Purge Board.......................................................................... 67
4.2.4 Switching Board................................................................................... 68
4.2.4.1 Switching Block............................................................................ 69
4.2.4.2 RF Filter Block .............................................................................. 69
4.2.4.3 Protective Devices........................................................................ 69
4.2.4.4 Battery Charger Block ................................................................. 70
4.2.4.5 5V Output DC/DC Converter ................................................... 70
4.2.4.6 Power On/ Off Switching........................................................... 70
4.2.4.7 Status Block................................................................................... 70
4.2.4.8 Motor Driver................................................................................. 70
4.2.4.9 External DC/DC Converter and External DC Source ............ 71
4.2.4.10 Auxiliary Power Supplies......................................................... 71
4.2.5 Power Supply (AC/DC Converter) .................................................. 71
4.2.5.1 Cooling Fan................................................................................... 71
4.3 LCD Display ......................................................................................71
4.4 Interface Board .................................................................................72
4.5 Power Pack .......................................................................................72
4.5.1 Gas Gauge............................................................................................. 73
Section 5: Maintenance and Calibration ..................... 75
5.1 Cleaning and Routine Maintenance................................................75
5.2 Preventive Maintenance...................................................................76

5.2.1 500 Hour PM .........................................................................................76
5.2.2 1500 Hour PM .......................................................................................77
5.2.3 Annual PM ............................................................................................78
5.2.4 15000 Hour PM .....................................................................................78
5.3 Storage ............................................................................................. 79
5.4 Calibration Procedure ..................................................................... 79
5.4.1 Purpose ..................................................................................................79
5.4.2 Scope ......................................................................................................80
5.4.3 Tools & Equipment ..............................................................................80
5.4.4 Initialization ..........................................................................................80
5.4.5 Procedure...............................................................................................80
5.4.5.1 Enter Calibration Menu ...............................................................81
5.4.5.2 Zero Sensors ..................................................................................82
5.4.5.3 Pressure Sensors ...........................................................................82
5.4.5.4 PEEP-RPM .....................................................................................83
5.4.5.5 Flow Sensor ...................................................................................84
5.4.5.6 Volume...........................................................................................85
5.4.5.7 O
2
System.......................................................................................85
5.4.5.8 Save New Calibration ..................................................................86
Section 6: Ventilator Test Procedures ........................ 89
6.1 Operational Verification Test .......................................................... 89
6.1.1 Purpose ..................................................................................................89
6.1.2 Scope ......................................................................................................89
6.1.3 Tools & Equipment ..............................................................................89
6.1.4 Initialization ..........................................................................................89
6.1.5 Procedure...............................................................................................89
6.2 Ventilator Verification Test (VVT) Procedure................................. 91
6.2.1 Purpose ..................................................................................................91

6.2.2 Scope...................................................................................................... 91
6.2.3 Tools & Equipment.............................................................................. 91
6.2.4 Initialization.......................................................................................... 91
6.2.5 Procedure .............................................................................................. 91
6.2.5.1 Alarm Sound Tests....................................................................... 92
6.2.5.2 Pressure Tests ............................................................................... 94
6.2.5.3 Flow Tests ..................................................................................... 95
6.2.5.4 O
2
Tests.......................................................................................... 95
6.2.5.5 Battery Test ................................................................................... 96
6.2.5.6 Watchdog Timer Tests................................................................. 96
6.3 Functional Verification Test Procedure..........................................98
6.3.1 Purpose.................................................................................................. 98
6.3.2 Scope...................................................................................................... 98
6.3.3 Tools & Equipment.............................................................................. 98
6.3.4 Initialization.......................................................................................... 99
6.3.5 Procedure .............................................................................................. 100
6.3.5.1 O
2
Delivery and Linearity........................................................... 100
6.3.5.2 100% O
2
(Suction) Test ................................................................ 101
6.3.5.3 Safety Alarms Test ....................................................................... 102
6.3.5.3.1 High Pressure Alarm ........................................................... 102
6.3.5.3.2 Apnea Alarm......................................................................... 103
6.3.5.3.3 Tube Disconnect Alarm....................................................... 103
6.3.5.3.4 Patient Disconnect Alarm ................................................... 104
6.3.5.3.5 Sensor Disconnect Alarm.................................................... 105
Section 7: Service Procedures..................................... 107
7.1 Software Upgrade Procedure ..........................................................107
7.1.1 Purpose.................................................................................................. 107
7.1.2 Scope...................................................................................................... 107
7.1.3 Tools & Equipment.............................................................................. 107

7.1.4 Procedure...............................................................................................107
7.2 Technical Logs Download............................................................... 110
7.2.1 Purpose ..................................................................................................110
7.2.2 Scope ......................................................................................................110
7.2.3 Tools & Equipment ..............................................................................110
7.2.4 Procedure...............................................................................................111
7.3 Option Package Update................................................................... 112
7.3.1 Purpose ..................................................................................................112
7.3.2 Scope ......................................................................................................112
7.3.3 Tools & Equipment ..............................................................................112
7.3.4 Procedure...............................................................................................112
7.4 Ventilator Disassembly and Assembly .......................................... 114
7.4.1 Purpose ..................................................................................................114
7.4.2 Scope ......................................................................................................114
7.4.3 Enclosure Disassembly & Assembly .................................................114
7.4.3.1 Tools & Equipment ......................................................................114
7.4.3.2 Enclosure Disassembly ................................................................115
7.4.3.3 Enclosure Assembly.....................................................................117
7.4.4 Electronic Module Removal and Installation...................................118
7.4.4.1 Tools & Equipment ......................................................................118
7.4.4.2 Electronic Module Removal........................................................118
7.4.4.3 Electronic Module Installation....................................................120
7.4.5 Electronic Module Disassembly and Assembly...............................121
7.4.5.1 Electronic Module Cover Removal and Installation ...............121
7.4.5.1.1 Tools & Equipment...............................................................121
7.4.5.1.2 Electronic Module Cover Removal ....................................121
7.4.5.1.3 Electronic Module Cover Installation................................122
7.4.5.2 Zeroing/ Purge Board Removal and Installation....................123
7.4.5.2.1 Tools & Equipment...............................................................123

7.4.5.2.2 Zeroing/ Purge Board Removal ........................................ 123
7.4.5.2.3 Zeroing/ Purge Board Installation .................................... 124
7.4.5.3 Main Board Removal and Installation ...................................... 125
7.4.5.3.1 Tools & Equipment .............................................................. 125
7.4.5.3.2 Main Board Removal........................................................... 125
7.4.5.3.3 Main Board Installation....................................................... 128
7.4.5.4 CPU Board Removal and Installation....................................... 128
7.4.5.4.1 Tools & Equipment .............................................................. 128
7.4.5.4.2 CPU Board Removal............................................................ 129
7.4.5.4.3 CPU Board Installation........................................................ 131
7.4.5.5 Power Supply Board Removal and Installation ...................... 131
7.4.5.5.1 Tools & Equipment .............................................................. 131
7.4.5.5.2 Power Supply Board Removal ........................................... 131
7.4.5.5.3 Power Supply Board Installation....................................... 133
7.4.5.6 Switching Board Removal and Installation.............................. 133
7.4.5.6.1 Tools & Equipment .............................................................. 133
7.4.5.6.2 Switching Board Removal................................................... 133
7.4.5.6.3 Switching Board Installation .............................................. 135
7.4.6 Pneumatic Unit Removal and Installation ....................................... 136
7.4.6.1 Tools & Equipment...................................................................... 136
7.4.6.2 Pneumatic Unit Removal............................................................ 136
7.4.6.3 Pneumatic Unit Installation........................................................ 137
7.4.7 LCD Assembly Removal and Installation........................................ 140
7.4.7.1 Tools and Equipment .................................................................. 140
7.4.7.2 LCD Assembly Removal............................................................. 140
7.4.7.3 LCD Assembly Installation......................................................... 141
7.4.8 Interface Board Removal and Installation........................................ 142
7.4.8.1 Tools & Equipment...................................................................... 142
7.4.8.2 Interface Board Removal............................................................. 142
7.4.8.3 Interface Board Installation ........................................................ 143
7.4.9 Power Pack Disassembly and Assembly.......................................... 144
7.4.9.1 Tools & Equipment...................................................................... 144
7.4.9.2 Power Pack Disassembly ............................................................ 144

7.4.9.3 Power Pack Assembly..................................................................145
7.4.10 O
2
Sensor Removal and Installation ................................................146
7.4.10.1 Tools & Equipment ....................................................................146
7.4.10.2 O
2
Sensor Removal .....................................................................146
7.4.10.3 O
2
Sensor Installation.................................................................146
7.5 Battery Gas Gauge Initialization Procedure .................................. 147
7.5.1 Purpose ..................................................................................................147
7.5.2 Scope ......................................................................................................147
7.5.3 Tools & Equipment ..............................................................................147
7.5.4 Procedure...............................................................................................147
Section 8: Troubleshooting.......................................... 149
8.1 Troubleshooting Guide ................................................................... 149
8.2 Diagnostics and Repairs ................................................................. 154
8.2.1 Power Switch ........................................................................................154
8.2.2 Demand Valve ......................................................................................156
8.2.3 Pressure Switch.....................................................................................157
8.2.4 Valve Limit Switch (O
2
Microswitch)................................................158
8.2.5 Flow Sensor Leak..................................................................................160
8.2.5.1 Root Cause - Pneumatic vs. Electronic ......................................162
8.2.5.2 Isolation of Internal Tube Leak...................................................162
8.2.5.3 Blower Pressure & Exhalation Valve Control ..........................163
8.2.5.4 Negative (-) Flow Port vs. Positive (+) Flow Port....................163
8.2.5.5 Negative (-) Flow Port & Patient Pressure................................164
8.2.5.6 Positive (+) Flow Port ..................................................................167
8.3 Exhale VT Accuracy......................................................................... 168
8.3.1 Inhale VT Accuracy..............................................................................168
8.3.2 Exhale VT Accuracy Interferences.....................................................168
8.3.3 Leakage ..................................................................................................169

8.3.4 Velocity.................................................................................................. 169
8.3.5 MAQUET (Siemens 190) Test lung ................................................... 170
8.4 Miscellaneous Issues.......................................................................171
8.4.1 Black Screen .......................................................................................... 171
8.4.2 Fails Calibrate Flow Sensor ................................................................ 171
8.4.3 Erratic O
2
Control ................................................................................ 171
8.4.4 Erratic Exhale Tidal Volumes ............................................................ 172
8.4.5 Low Pressure During Calibration or VVT ....................................... 172
8.5 Setting Up the Ventilator for Static Pressure.................................172
Appendix A: Parts and Accessories............................ 175
Appendix B: Service Report Form............................... 177
Appendix C: Technician Tool Utility Software............ 181
C.1 Purpose ............................................................................................181
C.2 Scope................................................................................................181
C.3 Tools & Equipment ..........................................................................181
C.4 Procedure.........................................................................................181
C.4.1 Software Installation........................................................................... 181
C.4.2 Initial Setup.......................................................................................... 182
C.4.3 Overview.............................................................................................. 184
C.4.4 Read All Parameters ........................................................................... 184
C.4.5 Card Number....................................................................................... 185
C.4.6 Read O2 Raw Value............................................................................ 185
C.4.7 Read Battery LMD .............................................................................. 186
C.4.8 Reset Battery Gas Gauge.................................................................... 187
C.4.9 Set Machine Serial Number............................................................... 188

C.4.10 SetUp Button ......................................................................................189
Appendix D: Wiring and Cables................................... 191
Index............................................................................... 195

Illustrations
Figure 1-1: The iVent
201
(front view) .............................................................................. 22
Figure 1-2: The iVent
201
(rear view)................................................................................ 23
Figure 3-1: External AC and DC Power ......................................................................... 38
Figure 3-2: Oxygen Inlet Connector................................................................................ 40
Figure 3-3: Low Pressure Oxygen Supply System ....................................................... 41
Figure 3-4: Patient Circuit ................................................................................................ 42
Figure 3-5: Patient Circuit Connection ........................................................................... 44
Figure 3-6: iVent
201
Filters................................................................................................ 46
Figure 3-7: Ventilator Controls........................................................................................ 47
Figure 4-1: Pneumatic Unit .............................................................................................. 50
Figure 4-2: Pneumatic Unit Overview............................................................................ 51
Figure 4-3: Electronic Module ......................................................................................... 59
Figure 4-4: Ventilator Overview...................................................................................... 60
Figure 5-1: Cooling Vent (left) and Cooling Air Inlet Filter (right)............................ 77
Figure 5-2: Entering the Maintenance Menu................................................................. 81
Figure 5-3: Entering the Calibration Menu.................................................................... 81
Figure 5-4: Zero Sensors ................................................................................................... 82
Figure 5-5: Calibrate Pressure Sensors ........................................................................... 83
Figure 5-6: Calibrate PEEP-RPM..................................................................................... 84
Figure 5-7: Calibrate Flow Sensor ................................................................................... 84
Figure 5-8: Calibrate Volume........................................................................................... 85
Figure 5-9: Calibrate O
2
System....................................................................................... 86
Figure 5-10: Save Calibration........................................................................................... 87
Figure 6-1: OVT #1 ............................................................................................................ 90
Figure 6-2: OVT #2 ............................................................................................................ 90
Figure 6-3: Entering the Maintenance Window............................................................ 93
Figure 6-4: Entering VVT ................................................................................................. 93

Figure 6-5: Pressure Tests .................................................................................................94
Figure 6-6: Pressure Test Results .....................................................................................94
Figure 6-7: Flow Tests........................................................................................................95
Figure 6-8: O
2
Tests (21%) .................................................................................................95
Figure 6-9: O
2
Tests (100%) ...............................................................................................96
Figure 6-10: Battery Test ...................................................................................................96
Figure 6-11: Reconnect AC Power...................................................................................97
Figure 6-12: Watchdog Timer Tests.................................................................................97
Figure 6-13: VVT Test Results ..........................................................................................98
Figure 6-14: External O
2
Analyzer Test Setup ...............................................................99
Figure 6-15: Internal O
2
Measurement..........................................................................100
Figure 6-16: 100% O
2
(Suction) Mode ...........................................................................101
Figure 6-17: High Pressure Alarm.................................................................................102
Figure 6-18: Apnea Alarm ..............................................................................................103
Figure 6-19: Tube Disconnect Alarm.............................................................................104
Figure 6-20: Patient Disconnect Alarm .........................................................................104
Figure 6-21: Sensor Disconnect Alarm..........................................................................105
Figure 7-1: RS-232 Cable to iVent
201
..............................................................................108
Figure 7-2: Upgrade iVent
201
Software Screen.............................................................108
Figure 7-3: Upgrade iVent
201
PC Application Screens................................................109
Figure 7-4: ivDownload PC Application Screens........................................................111
Figure 7-5: Update Package Key....................................................................................113
Figure 7-6: Enclosure (Rear View) #1............................................................................116
Figure 7-7: Front Enclosure (Inside View) #1 ..............................................................116
Figure 7-8: Rear Enclosure (Inside View) #1................................................................117
Figure 7-9: Enclosure (Rear View) #2............................................................................119
Figure 7-10: Rear Enclosure (Inside View) #2..............................................................120
Figure 7-11: EM Cover Screw Locations.......................................................................122
Figure 7-12: EM Sensor Tubing Cover Screw Locations ............................................122
Figure 7-13: EM with Cover Removed to Show Zeroing/ Purge PCB ....................124
Figure 7-14: Electronic Module (Rear View) – Remote Alarm Area ........................125

Figure 7-15: Main Board ................................................................................................. 127
Figure 7-16: CPU Board.................................................................................................. 130
Figure 7-17: EM with Side Cover Lowered to Show Power Supply........................ 132
Figure 7-18: EM with Side Cover Lowered to Show Switching Board.................... 134
Figure 7-19: Switching Board Screw Locations........................................................... 135
Figure 7-20: Rear Enclosure (Inside View) #3 ............................................................. 137
Figure 7-21: O
2
Mixer Cam to Mid Point Position...................................................... 138
Figure 7-22: PU Ground Point Locations ..................................................................... 139
Figure 7-23: Front Enclosure (Inside View #2)............................................................ 141
Figure 7-24: Front Enclosure (Inside View) #3............................................................ 143
Figure 7-25: Power Pack (Rear View) ........................................................................... 145
Figure 7-26: Power Pack (Removed)............................................................................. 145
Figure 8-1: Power Switch Assembly............................................................................. 155
Figure 8-2: O
2
Inlet Pipe and Demand Valve .............................................................. 157
Figure 8-3: PU Main Connector (Front View) - Pressure Switch Pinout................. 158
Figure 8-4: O
2
Mixer (Top View) ................................................................................... 159
Figure 8-5: Main Connector (Front View) - Microswitch Pinout ............................ 160
Figure 8-6: Pneumatic Sensors Connections................................................................ 161
Figure 8-7: Test Setup (Unit Operating Disassembled) ............................................. 166
Figure 8-8: Flow Graphs (Occluding the Negative Flow Sensor Port) .................... 167
Figure 8-9: Flow Graphs (Occluding the Positive Flow Sensor Port) ...................... 167
Figure 8-10: Flow Graphs (High Velocity Exhale)...................................................... 170
Figure 8-11: Test Lung 190 and iVent
201
Waveforms ................................................. 171
Figure C-1: Password Entry Box ................................................................................... 182
Figure C-2: Creating File Message Box ........................................................................ 183
Figure C-3: Select Communication Port....................................................................... 183
Figure C-4: Main Screen ................................................................................................. 184
Figure C-5: O2 Raw Value Too Low Pop-Up.............................................................. 186
Figure C-6: LMD Value Too Low Pop-Up................................................................... 187
Figure C-7: LMD Reset Verification Pop-Up............................................................... 188
Figure C-8: Set Machine Serial Number....................................................................... 189

Figure D-1: iVent
201
Wiring Diagram (Page 1).............................................................193
Figure D-2: iVent
201
Wiring Diagram (Page 2).............................................................194

Tables
Table 2-1: Displayed Parameters and Indicators During Ventilation........................ 34
Table 3-1: Internal Battery Charge Level Indicator ...................................................... 39
Table 5-1: Cleaning and Routine Maintenance ............................................................. 75
Table 5-2: Preventive Maintenance Schedule................................................................ 76
Table 8-1: Troubleshooting Guide ............................................................................... 150