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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
2.1 Wall Tag.......................................................................5
2.2 Corrosive Chemicals....................................................5
2.3 National Standards and Applicable Codes ..................5
SECTION 3: Critical Considerations .....................................6
3.1 Basic Information.........................................................6
3.2 Manufactured Units......................................................6
3.3 Location and Suspension ............................................6
3.4 Minimum Required Installation Clearances .................6
3.5 Ventilation....................................................................6
3.6 Gas Supply..................................................................6
3.7 Electrical Supply..........................................................6
3.8 Vent..............................................................................6
SECTION 4: Clearances TO combustibles............................7
4.1 Required Clearances To Combustibles........................7
4.2 Clearances To Combustibles.......................................7
SECTION 5: National Standards and Applicable Codes .....8
5.1 Gas Codes...................................................................8
5.2 Aircraft Hangars...........................................................8
5.3 Parking Structures and Repair Garages......................8
5.4 Electrical......................................................................8
5.5 Venting.........................................................................8
5.6 High Altitude ................................................................9
SECTION 6: Heater installation............................................10
6.1 General......................................................................10
6.2 Suspension................................................................10
SECTION 7: Venting.............................................................. 11
7.1 Venting ....................................................................... 11
7.2 Vent Installation.......................................................... 11
7.3 Unvented Operation ...................................................12
7.4 Horizontal Venting ......................................................12
7.5 Vertical Venting...........................................................12
7.6 Length Requirements.................................................12
7.7 Vent Material...............................................................13
7.8 Replacing an Existing Heater in a Venting System.....13
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 Low Voltage Thermostat with Multiple Heaters
(Models UHA[X][S]150 - 250)....................................22
10.4 Low Voltage Thermostat with Multiple Heaters
(Models UHA[X][S]300 - 400)....................................23
10.5 UHA[X][S] Series Internal Wiring Diagram...............24
10.6 UHA[X][S] Series Ladder Wiring Diagram................25
10.7 Electrical Connection to the Heater..........................26
SECTION 11: Operation and Maintenance ..........................27
11.1 Pre-Start-Up Checks.................................................27
11.2 Begin Start-Up..........................................................28
11.3 Complete the Start-Up..............................................30
SECTION 12: User Instructions............................................31
12.1 Heater Operation......................................................31
12.2 Lighting Instructions.................................................31
12.3 Simple Troubleshooting............................................31
SECTION 13: Servicing.........................................................32
13.1 Servicing Instructions...............................................32
13.2 Burner Maintenance.................................................32
13.3 Fan/Motor Assembly Maintenance...........................32
13.4 Heat Exchanger Maintenance..................................32
13.5 Gas Valve Maintenance ...........................................32
13.6 Flue Blower..............................................................32
13.7 Venting and Air Intake Pipe......................................33
13.8 Maintenance Checklist.............................................33
SECTION 14: Troubleshooting.............................................35
14.1 General ....................................................................36
14.2 Troubleshooting For Automatic Ignition Burner
Systems...................................................................37
14.3 Troubleshooting for Flame Supervision System.......38
14.4 Troubleshooting for Gas Valves................................39
14.5 Troubleshooting for Flue Blower...............................39
SECTION 15: Replacement Parts.........................................40
15.1 Gas Valve.................................................................40
15.2 Burner Compartment ...............................................41
15.3 Ignition Electrode and Flame Probe.........................42
15.4 Heat Exchanger .......................................................43
15.5 Louvers and Louver Spring ......................................43
15.6 Flue Blow
er .............................................................44
15.7 Pressure Switch........................................................45
15.8 Ignition Control.........................................................45
15.9 Axial Fan/Guard/Motor Assembly.............................45
15.10 Limit Switches ........................................................46
SECTION 16: Specifications.................................................47
16.1 Dimension Data........................................................47
16.2 General Technical Data Table ..................................48
16.3 Technical Data Table................................................48
SECTION 17: The ROBERTS GORDON
®
COMBAT
®
UHA-Series Warranty.....................................50