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© 2012
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
1.2 Safety Labels and Their Placement .............................1
1.3 California Proposition 65 ..............................................1
SECTION 2: Installer Responsibility .....................................4
2.1 Wall Tag .......................................................................4
2.2 Corrosive Chemicals....................................................4
2.3 National Standards and Applicable Codes ..................4
SECTION 3: Critical Considerations .....................................5
3.1 Basic Information.........................................................5
3.2 Manufactured Units......................................................5
3.3 Location and Suspension ............................................5
3.4 Minimum Required Installation Clearances .................5
3.5 Ventilation ....................................................................5
3.6 Gas Supply ..................................................................5
3.7 Electrical Supply..........................................................5
3.8 Vent..............................................................................5
SECTION 4: Clearances to Combustibles.............................6
4.1 Required Clearances to Combustibles.........................6
4.2 Clearances to Combustibles........................................6
SECTION 5: National Standards and Applicable Codes .....7
5.1 Gas Codes...................................................................7
5.2 Aircraft Hangars ...........................................................7
5.3 Parking Structures and Repair Garages......................7
5.4 Electrical......................................................................7
5.5 Venting.........................................................................7
5.6 High Altitude ................................................................8
SECTION 6: Duct Heater Installation.....................................9
6.1 General........................................................................9
6.2 Shelf Mounting and Suspension................................10
6.3 Wall Mounting............................................................ 10
SECTION 7: Venting..............................................................12
7.1 Changing Vent and Air Intake Orientation ..................12
7.2 Venting .......................................................................12
7.3 Vent Installation..........................................................12
7.4 Unvented Operation ...................................................13
7.5 Horizontal Venting ......................................................13
7.6 Vertical Venting...........................................................13
7.7 Length Requirements.................................................13
7.8 Vent Material...............................................................14
7.9 Replacing an Existing Heater in a Venting System.....14
SECTION 8: Air Supply.........................................................18
8.1 Separated Combustion Installation............................18
8.2 Unvented Installation ................................................. 18
8.3 Building Ventilation ....................................................18
8.4 Outside Combustion Air Supply.................................18
SECTION 9: Gas Piping........................................................19
9.1 Connections...............................................................19
SECTION 10: Wiring..............................................................21
10.1 Positioning Thermostats ..........................................21
10.2 Low Voltage Thermostat with One Heater................21
10.3 UHD[X][S] Series Internal Wiring Diagram...............22
10.4 UHD[X][S] Series Ladder Wiring Diagram................23
10.5 Electrical Connection to the Heater..........................24
SECTION 11: Operation and Maintenance ..........................25
11.1 Pre-Start-Up Checks.................................................25
11.2 Begin Start-Up ..........................................................25
11.3 Complete Start-Up ....................................................27
SECTION 12: User Instructions............................................28
12.1 Heater Operation......................................................28
12.2 Common User Controls............................................28
12.3 Lighting Instructions.................................................29
12.4 Simple Troubleshooting............................................29
SECTION 13: Servicing.........................................................30
13.1 Servicing Instructions...............................................30
13.2 Burner Maintenance.................................................30
13.3 Heat Exchanger Maintenance..................................30
13.4 Gas Valve Maintenance ...........................................30
13.5 Flue Blower..............................................................30
13.6 Venting and Air Intake Pipe......................................30
13.7 Maintenance Checklist.............................................31
SECTION 14: Troubleshooting.............................................33
14.1 General ....................................................................34
14.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................35
14.3 Troubleshooting for Flame Supervision System.......36
14.4 Troubleshooting for Gas Valves................................37
14.5 Troubleshooting for Flue Blower...............................37
SECTION 15: Replacement Parts.........................................38
15.1 Gas Valve.................................................................38
15.2 Burner Compartment ...............................................39
15.3 Ignition Electrode and Flame Probe.........................40
15.4 Heat Exchanger .......................................................40
15.5 Flue Blower Vertical Installation...............................41
15.6 Pressure S
witch........................................................42
15.7 Ignition Control.........................................................42
15.8 Limit Switches ..........................................................42
SECTION 16: Specifications.................................................43
16.1 Dimension Data........................................................43
16.2 General Technical Data Table ..................................44
16.3 Technical Data Table................................................44
SECTION 17: ROBERTS GORDON
®
COMBAT
®
UHD-Series Warranty.....................................46