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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 Location and Suspension ............................................3
3.3 Minimum Required Installation Clearances .................3
3.4 Clearances to Combustibles........................................3
3.5 Ventilation ....................................................................3
3.6 Gas Supply..................................................................3
3.7 Electrical Supply..........................................................3
3.8 Vent..............................................................................3
3.9 Separated Combustion Installation..............................3
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 ................................................................5
SECTION 5: Major Components ............................................6
5.1 General........................................................................6
5.2 Suspension..................................................................6
SECTION 6: Venting................................................................7
6.1 Venting.........................................................................7
6.2 Vent Installation ...........................................................7
6.3 Unvented Operation.....................................................8
6.4 Horizontal Venting........................................................8
6.5 Vertical Venting............................................................8
6.6 Length Requirements ..................................................8
6.7 Vent Material................................................................9
SECTION 7: Air Supply.........................................................13
7.1 Separated Combustion Installation.............................13
7.2 Unvented Installation.................................................. 13
7.3 Building Ventilation.....................................................13
7.4 Outside Combustion Air Supply..................................13
SECTION 8: Gas Piping........................................................14
8.1 Connections...............................................................14
SECTION 9: Wiring................................................................15
9.1 Positioning Thermostats ............................................ 15
9.2 Low Voltage Thermostat with One Heater .................15
9.3 UHA[S] Series Internal Wiring Diagram.....................16
9.4 UHA[S] Series Ladder Wiring Diagram...................... 17
9.5 Electrical Connection to the Heater ........................... 18
SECTION 10: Operation and Maintenance..........................19
10.1 Pre-Start-Up Checks................................................19
10.2 Begin Start-Up ......................................................... 19
10.3 Complete the Start-Up .............................................21
SECTION 11: User Instructions............................................22
11.1 User Instructions.......................................................22
11.2 Heater Operation ......................................................22
11.3 Lighting Instructions..................................................22
11.4 Simple Troubleshooting.............................................22
SECTION 12: Servicing.........................................................24
12.1 Servicing Instructions...............................................24
12.2 Burner Maintenance.................................................24
12.3 Fan/Motor Assembly Maintenance...........................24
12.4 Heat Exchanger Maintenance..................................24
12.5 Gas Valve Maintenance ...........................................24
12.6 Flue Blower ..............................................................24
12.7 Venting and Air Intake Pipe......................................24
12.8 Maintenance Checklist.............................................25
SECTION 13: Troubleshooting .............................................27
13.1 General ....................................................................27
13.2 Troubleshooting For Automatic Ignition
Burner Systems .......................................................28
13.3 Troubleshooting for Flame Supervision System.......29
13.4 Troubleshooting for Gas Valves................................30
13.5 Troubleshooting for Flue Blower...............................30
SECTION 14: Replacement Parts.........................................31
14.1 Gas Valve.................................................................31
14.2 Burner Compartment ...............................................32
14.3 Ignition Electrode and Flame Probe.........................33
14.4 Heat Exchanger .......................................................34
14.5 Louvers and Louver Spring ......................................34
14.6 Flue Blower .............................................................35
14.7 Pressure Switch........................................................36
14.8 Ignition Control.........................................................36
14.9 Axial Fan/Guard/Motor Assembly.............................36
14.10 Limit Switches ........................................................37
SECTION 15: Specifications.................................................38
15.1 Standard (Models 150 - 400) UHA[S] Series
Dimension Data .......................................................38
15.2 General Technical Data Table (All Models) ..............39
15.3 Technical Data Table (All Models) ............................39
SECTION 16: The ROBERTS GORDON
®
COMBAT
®
UHA-Series Warranty.....................................41