Service manual

© 2006 Roberts-Gordon, LLC
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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 Public 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 Shelf Mounting and Suspension..................................6
5.3 Wall Mounting .............................................................. 6
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.............................................................. 11
6.9 Replacing an Existing Heater in a Venting System .... 12
SECTION 7: Air Supply......................................................... 16
7.1 Separated Combustion Installation............................. 16
7.2 Unvented Installation .................................................. 16
7.3 Building Ventilation ..................................................... 16
7.4 Outside Combustion Air Supply.................................. 16
SECTION 8: Gas Piping........................................................ 17
8.1 Connections............................................................... 17
SECTION 9: Wiring................................................................ 18
9.1 Positioning Thermostats ............................................ 18
9.2 Low Voltage Thermostat with One Heater ................. 18
9.3 UH (A) (AS) Series Internal Wiring Diagram.............. 19
9.4 UH (A) (AS) Series Ladder Wiring Diagram.............. 20
9.5 Electrical Connection to the Heater ........................... 21
SECTION 10: Operation and Maintenence ..........................22
10.1 Pre-Start-Up Checks ................................................22
10.2 Begin Start-Up .........................................................22
10.3 Complete the 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 Fan/Motor Assembly Maintenance ...........................28
12.4 Heat Exchanger Maintenance..................................28
12.5 Gas Valve Maintenance ...........................................28
12.6 Combustion Fan .......................................................28
12.7 Venting and Air Intake Pipe ......................................28
12.8 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 Combustion Fan........................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 Combustion Fan Vertical Installation ........................38
14.5 Pressure Switch........................................................39
14.6 Ignition Control .........................................................40
14.7 Axial Fan/Guard/Motor Assembly.............................40
14.8 Limit Switches ..........................................................40
SECTION 15: Specifications.................................................41
15.1 Low-Profile (Models 30 - 125) UH(A) (AS) Series
Dimension Data.........................................................41
15.2 General Technical Data Table (All Models) ..............42
15.3 Technical Data Table (All Models) ............................42
SECTION 16: The ROBERTS GORDON
®
Combat
®
Tubular Unit Heater Warranty .........................43