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© 2008
Roberts-Gordon LLC
All rights reserved. No part of this work covered by the copyrights herein may be reproduced
or copied in any form or by any means - graphic, electronic, or mechanical, including
photocopying, recording, taping or information storage and retrieval systems - without the
written permission of Roberts-Gordon LLC.
Printed in U.S.A.
TABLE OF CONTENTS
SECTION 1: Heater Safety......................................................1
1.1 Manpower Requirements .............................................1
SECTION 2: Installer Responsibility .....................................2
2.1 Wall Tag.......................................................................2
2.2 Corrosive Chemicals....................................................2
2.3 National Standards and Applicable Codes ..................2
SECTION 3: Critical Considerations .....................................3
3.1 Basic Information.........................................................3
3.2 Manufactured Units......................................................3
3.3 Location and Suspension ............................................3
3.4 Minimum Required Installation Clearances .................3
3.5 Clearances to Combustibles........................................3
3.6 Ventilation ....................................................................4
3.7 Gas Supply..................................................................4
3.8 Electrical Supply..........................................................4
3.9 Vent..............................................................................4
SECTION 4: National Standards and Applicable Codes .....5
4.1 Gas Codes...................................................................5
4.2 Aircraft Hangars ...........................................................5
4.3 Parking Structures and Repair Garages......................5
4.4 Electrical......................................................................5
4.5 Venting.........................................................................5
4.6 High Altitude ................................................................6
SECTION 5: Duct Heater Installation.....................................7
5.1 General........................................................................7
5.2 Suspension..................................................................8
SECTION 6: Venting................................................................9
6.1 Changing Vent and Air Intake Orientation....................9
6.2 Venting.........................................................................9
6.3 Vent Installation ...........................................................9
6.4 Unvented Operation................................................... 10
6.5 Horizontal Venting...................................................... 10
6.6 Vertical Venting.......................................................... 10
6.7 Length Requirements ................................................ 10
6.8 Vent Material.............................................................. 11
6.9 Replacing an Existing Heater in a Venting System.... 11
SECTION 7: Air Supply.........................................................15
7.1 Separated Combustion Installation.............................15
7.2 Unvented Installation..................................................15
7.3 Building Ventilation..................................................... 15
7.4 Outside Combustion Air Supply..................................15
SECTION 8: Gas Piping........................................................16
8.1 Connections...............................................................16
SECTION 9: Wiring................................................................17
9.1 Positioning Thermostats ............................................17
9.2 Low Voltage Thermostat with One Heater.................17
9.3 Internal Wiring Diagram............................................. 18
9.4 Ladder Wiring Diagram.............................................. 19
9.5 Electrical Connection to the Heater ...........................20
SECTION 10: Operation and Maintenance ..........................21
10.1 Pre-Start-Up Checks ................................................21
10.2 Begin Start-Up .........................................................21
10.3 Complete Start-Up ...................................................23
SECTION 11: User Instructions............................................24
11.1 User Instructions.......................................................24
11.2 Heater Operation ......................................................24
11.3 Lighting Instructions..................................................24
11.4 Simple Troubleshooting.............................................24
SECTION 12: Servicing.........................................................25
12.1 Servicing Instructions...............................................25
12.2 Burner Maintenance.................................................25
12.3 Heat Exchanger Maintenance..................................25
12.4 Gas Valve Maintenance ...........................................25
12.5 Flue Blower ..............................................................25
12.6 Venting and Air Intake Pipe......................................25
12.7 Maintenance Checklist.............................................26
SECTION 13: Troubleshooting.............................................28
13.1 General ....................................................................28
13.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................29
13.3 Troubleshooting for Flame Supervision System.......30
13.4 Troubleshooting for Gas Valves................................31
13.5 Troubleshooting for Flue Blower...............................31
SECTION 14: Replacement Parts.........................................32
14.1 Gas Valve.................................................................32
14.2 Burner Compartment ...............................................33
14.3 Ignition Electrode and Flame Probe.........................34
14.4 Heat Exchanger .......................................................35
14.5 Flue Blower .............................................................35
14.6 Pressure Switch........................................................36
14.7 Ignition Control.........................................................36
14.8 Limit Switches ..........................................................36
SECTION 15: Specifications.................................................37
15.1 Dimension Data........................................................37
15.2 General Technical Data Table ..................................38
15.3 Technical Data Table ................................................38
SECTION 16: The ROBERTS GORDON
®
COMBAT
®
UHD-Series Warranty.....................................39