Service manual

© 2013
Addison
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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......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 Maximum Vent Lengths Table..................................... 12
7.7 Vent Material............................................................... 12
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 for
Models UHA[T][X][S] 150-250 .................................22
10.3 Low Voltage Thermostat with One Heater for
Models UHA[X][S] 300-400......................................22
10.4 Low Voltage Thermostat with Multiple Heaters
(Models UHA[T][X][S]150 - 250)...............................23
10.5 Low Voltage Thermostat with Multiple Heaters
(Models UHA[X][S]300 - 400).................................. 24
10.6 UHA[X][S] Series Internal Wiring Diagram for
Single Stage Gas Valves ......................................... 25
10.7 UHA[X][S] Series Ladder Wiring Diagram for
Single Stage Gas Valves ......................................... 26
10.8 UHA[T][X][S] Series Internal Wiring Diagram for
Two Stage Gas Valves ............................................. 27
10.9 UHA[T][X][S] Series Ladder Wiring Diagram for
Two Stage Gas Valves ............................................. 28
10.10 Electrical Connection to the Heater ....................... 29
SECTION 11: Operation and Maintenance ......................... 30
11.1 Pre-Start-Up Checks ................................................ 30
11.2 Begin Start-Up ......................................................... 31
11.3 Pressure Switch........................................................ 33
11.4 Turning Off the Heater .............................................. 33
11.5 External Controls...................................................... 33
11.6 Complete the Start-Up ............................................. 33
11.7 Instruction to the User.............................................. 33
SECTION 12: User Instructions........................................... 34
12.1 Heater Operation..................................................... 34
12.2 Lighting Instructions ................................................ 34
12.3 Simple Troubleshooting ........................................... 34
SECTION 13: Servicing ........................................................ 35
13.1 Servicing Instructions .............................................. 35
13.2 Burner Maintenance................................................ 35
13.3 Fan/Motor Assembly Maintenance .......................... 36
13.4 Heat Exchanger Maintenance ................................. 36
13.5 Gas Valve Maintenance........................................... 36
13.6 Flue Blower ............................................................. 36
13.7 Venting and Air Intake Pipe ..................................... 36
13.8 Maintenance Checklist ............................................ 36
SECTION 14: Troubleshooting............................................. 39
14.1 General.................................................................... 40
14.2 Troubleshooting For Automatic Ignition Burner
Systems................................................................... 41
14.3 Troubleshooting for Flame Supervision System....... 42
14.4 Troubleshooting for Gas Valves ............................... 43
14.5 Troubleshooting for Flue Blower .............................. 43
SECTION 15: Replacement Parts ........................................ 44
15.1 Gas Valve ................................................................ 44
15.2 Burner Compartment for Models UHA[T][X][S]
150-250 .................................................................... 45
15.3 Burner Compartment for Models UHA[X][S]
300-400 ................................................................... 47
15.4 Ignition Electrode and Flame Probe for Models
UHA[T][X][S] 150-250.............................................. 48
15.5 Ignition Electrode and Flame Probe for Models
UHA[X][S] 300-400.................................................. 49
15.6 Heat Exchanger....................................................... 50
15.7 Louvers and Louver Spring ..................................... 50
15.8 Flue Blower for Models UHA[T][X][S] 150-175 ........ 51
15.9 Flue Blower for Models UHA[T][X][S] 200-300 ....... 52
15.10 Flue Blower for Models UHA[X][S] 350-400 ......... 53
15.11 Pressure Switch ..................................................... 54