© 200
8
Ro
b
erts-Gordon LLC
All rights reser
v
ed.
N
o part of this
w
ork co
v
ered
b
y the copyrights herein may
b
e reprod
u
ced
or copied in any form or
b
y any means - graphic, electronic, or mechanical, incl
u
ding
photocopying, recording, taping or information storage and retrie
v
al systems -
w
itho
u
t the
w
ritten permission of Ro
b
erts-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
SECTION 2: Installer Responsibility ..................................... 5
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 Clearances to Combustibles ........................................ 6
3.6 Ventilation .................................................................... 6
3.7 Gas Supply .................................................................. 7
3.8 Electrical Supply ......................................................... 7
3.9 Vent.............................................................................. 7
SECTION 4: National Standards and Applicable Codes ..... 8
4.1 Gas Codes................................................................... 8
4.2 Aircraft Hangars ........................................................... 8
4.3 Parking Structures and Repair Garages ...................... 8
4.4 Electrical ...................................................................... 8
4.5 Venting......................................................................... 8
4.6 High Altitude ................................................................ 9
SECTION 5: Major Components .......................................... 10
5.1 General ...................................................................... 10
5.2 Shelf Mounting and Suspension ................................ 10
5.3 Wall Mounting ............................................................ 10
SECTION 6: Venting.............................................................. 14
6.1 Changing Vent and Air Intake Orientation.................. 14
6.2 Venting....................................................................... 14
6.3 Vent Installation ......................................................... 14
6.4 Unvented Operation................................................... 15
6.5 Horizontal Venting...................................................... 15
6.6 Vertical Venting .......................................................... 16
6.7 Length Requirements ................................................ 16
6.8 Vent Material.............................................................. 16
6.9 Replacing an Existing Heater in a Venting System .... 16
SECTION 7: Air Supply......................................................... 21
7.1 Separated Combustion Installation............................. 21
7.2 Unvented Installation .................................................. 21
7.3 Building Ventilation ..................................................... 21
7.4 Outside Combustion Air Supply.................................. 21
SECTION 8: Gas Piping ........................................................ 22
8.1 Connections............................................................... 22
SECTION 9: Wiring................................................................ 23
9.1 Positioning Thermostats ............................................ 23
9.2 Low Voltage Thermostat with One Heater ................. 23
9.3 Multiple Heater Wiring 30 - 45 ................................... 24
9.4 Multiple Heater Wiring 60 - 125 ................................. 25
9.5 Internal Wiring Diagram ............................................. 26
9.6 Ladder Wiring Diagram.............................................. 27
9.7 Electrical Connection to the Heater ........................... 28
SECTION 10: Operation and Maintenance ..........................29
10.1 Pre-Start-Up Checks ................................................29
10.2 Begin Start-Up .........................................................29
10.3 Complete Start-Up ...................................................32
SECTION 11: User Instructions............................................33
11.1 User Instructions .......................................................33
11.2 Heater Operation ......................................................33
11.3 Common User Controls.............................................33
11.4 Lighting Instructions ..................................................33
11.5 Simple Troubleshooting.............................................34
SECTION 12: Servicing .........................................................35
12.1 Servicing Instructions...............................................35
12.2 Burner Maintenance.................................................35
12.3 Fan/Motor Assembly Maintenance ...........................35
12.4 Heat Exchanger Maintenance ..................................35
12.5 Gas Valve Maintenance ...........................................35
12.6 Flue Blower ..............................................................35
12.7 Venting and Air Intake Pipe ......................................36
12.8 Maintenance Checklist .............................................36
SECTION 13: Troubleshooting .............................................38
13.1 General ....................................................................38
13.2 Troubleshooting For Automatic Ignition
Burner Systems .......................................................39
13.3 Troubleshooting for Flame Supervision System .......40
13.4 Troubleshooting for Gas Valves ................................41
13.5 Troubleshooting for Flue Blower ...............................41
SECTION 14: Replacement Parts.........................................42
14.1 Gas Valve .................................................................42
14.2 Burner Compartment ...............................................43
14.3 Ignition Electrode and Flame Probe .........................44
14.4 Heat Exchanger .......................................................45
14.5 Louver and Louver Springs ......................................45
14.6 Flue Blower Vertical Installation ...............................46
14.7 Pressure Switch........................................................47
14.8 Ignition Control .........................................................47
14.9 Axial Fan/Guard/Motor Assembly.............................47
14.10 Limit Switches ........................................................48
SECTION 15: Specifications.................................................49
15.1 Dimension Data........................................................49
15.2 General Technical Data Table (All Models) ..............50
15.3 Technical Data Table (All Models) ............................50
SECTION 16: ROBERTS GORDON
®
COMBAT
®
UHA-Series Warranty......................................53
