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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 Shelf Mounting and Suspension..................................8
5.3 Wall Mounting..............................................................8
SECTION 6: Venting.............................................................. 10
6.1 Changing Vent and Air Intake Orientation.................. 10
6.2 Venting....................................................................... 10
6.3 Vent Installation ......................................................... 10
6.4 Unvented Operation................................................... 11
6.5 Horizontal Venting...................................................... 11
6.6 Vertical Venting.......................................................... 11
6.7 Length Requirements ................................................ 11
6.8 Vent Material.............................................................. 12
6.9 Replacing an Existing Heater in a Venting System.... 12
SECTION 7: Air Supply......................................................... 17
7.1 Separated Combustion Installation.............................17
7.2 Unvented Installation..................................................17
7.3 Building Ventilation.....................................................17
7.4 Outside Combustion Air Supply..................................17
SECTION 8: Gas Piping........................................................ 18
8.1 Connections............................................................... 18
SECTION 9: Wiring................................................................ 19
9.1 Positioning Thermostats ............................................19
9.2 Low Voltage Thermostat with One Heater ................. 19
9.3 Internal Wiring Diagram.............................................20
9.4 Ladder Wiring Diagram..............................................21
9.5 Electrical Connection to the Heater ...........................22
SECTION 10: Operation and Maintenance..........................23
10.1 Pre-Start-Up Checks ................................................23
10.2 Begin Start-Up .........................................................23
10.3 Complete Start-Up ...................................................25
SECTION 11: User Instructions............................................26
11.1 User Instructions.......................................................26
11.2 Heater Operation ......................................................26
11.3 Common User Controls.............................................26
11.4 Lighting Instructions..................................................26
11.5 Simple Troubleshooting.............................................27
SECTION 12: Servicing.........................................................28
12.1 Servicing Instructions...............................................28
12.2 Burner Maintenance.................................................28
12.3 Heat Exchanger Maintenance..................................28
12.4 Gas Valve Maintenance ...........................................28
12.5 Flue Blower ..............................................................28
12.6 Venting and Air Intake Pipe......................................28
12.7 Maintenance Checklist.............................................29
SECTION 13: Troubleshooting .............................................31
13.1 General ....................................................................31
13.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................32
13.3 Troubleshooting for Flame Supervision System.......33
13.4 Troubleshooting for Gas Valves................................34
13.5 Troubleshooting for Flue Blower...............................34
SECTION 14: Replacement Parts.........................................35
14.1 Gas Valve.................................................................35
14.2 Burner Compartment ...............................................36
14.3 Ignition Electrode and Flame Probe.........................37
14.4 Heat Exchanger .......................................................37
14.5 Flue Blower Vertical Installation ...............................38
14.6 Pressure Switch........................................................39
14.7 Ignition Control.........................................................39
14.8 Limit Switches ..........................................................39
SECTION 15: Specifications.................................................40
15.1 Dimension Data........................................................40
15.2 General Technical Data Table ..................................41
15.3 Technical Data Table ................................................41
SECTION 16: ROBERTS GORDON
®
COMBAT
®
UHD-Series
Warranty..........................................................43