Service manual
Table Of Contents
- Installation, Operation & Service Manual
- UHA-Series
- Tubular Unit and Utility Heaters
- (Low Profile Range)
- Manuel d’installation, d’operation, et de service
- UHA-Series
- Aérothermes Utilitaires à échangeur tubulaire
- (Gamme compacte)
- TABLE OF CONTENTS
- SECTION 1: Heater Safety
- SECTION 2: Installer Responsibility
- SECTION 3: Critical Considerations
- SECTION 4: Clearances to Combustibles
- SECTION 5: National Standards and Applicable Codes
- SECTION 6: Heater installation
- SECTION 7: Venting
- 7.2.1 United States Requirements
- 7.2.2 Canadian Requirements
- 7.3.1 Standard Vented Heaters (Models UHA[X] 30 - 125)
- 7.3.2 Separated Combustion Heaters (Models UHA[X]S 30 - 125)
- 7.7.1 Maximum Vent Lengths Table
- 1. Seal any unused openings in the venting system.
- 2. Inspect the venting system for proper size and horizontal pitch, as required by the NFPA 54/ ANSI Z223.1 - latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) and these instruction...
- 3. Close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any exhaust fans, such as range hoods and bathr...
- 4. Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously.
- 5. For any appliance having a draft hood, test for draft hood appliance spillage at the draft hood relief opening after five minutes of main burner operation. Use the flame of a match or candle.
- 6. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliances to their previous conditions...
- 7. If improper venting is observed during any of the above tests, the venting system must be corrected by a contractor qualified in the installation and service of gas-fired equipment or your local gas supplier. If the venting must be resized, use ap...
- Figure 9: Vent and Roof Detail
- Figure 10: Standard Vented Heater - Vertical and Horizontal Vent Termination
- Figure 11: Standard Vented Heater - Common Vertical Vent Termination
- Figure 12: Separated Combustion Heater - Vertical and Horizontal Vent Termination
- Figure 13: Concentric Vent Box
- Figure 14: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater
- SECTION 8: Air Supply
- SECTION 9: Gas Piping
- SECTION 10: Wiring
- SECTION 11: Operation and Maintenance
- 11.1.1 Louvers
- 11.1.2 Electrical Checks
- 11.1.3 Gas Supply
- 11.1.4 Mechanical Checks
- 11.2.1 Before Operating the Heater
- Figure 16: Automatic Burner Control Sequence
- Figure 17: Gas Valve for Models UHA[X][S] 30 - 45
- Figure 18: Gas Valve for Models UHA[X][S] 60 - 125
- 11.2.2 Start-Up the Gas Valve (All Gases)
- 11.2.2.1 Check Burner Gas Pressure
- 1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer.
- 2. With the burner firing, measure the pressure on the manometer. To adjust the burner pressure, remove the regulator cover from the valve and turn the regulator adjustment screw to set the required burner pressure as stated in the Technical Data Tab...
- 11.2.2.2 Check Gas Rate
- 1. After burner pressure adjustment, allow the heater to operate for at least 15 minutes and then re-check settings. Adjust pressure setting if necessary.
- 2. Check gas flow rate at gas meter.
- 3. Turn off heater and electrical supply.
- 4. Remove the manometer and refit all covers to the valve and tighten the screw of the outlet pressure tap.
- 11.2.2.1 Check Burner Gas Pressure
- 11.2.2 Start-Up the Gas Valve (All Gases)
- SECTION 12: User Instructions
- SECTION 13: Servicing
- 1. Open the hinged door and remove from the hinges. Set door aside. See Page 46, Section 15.2.
- 2. Remove burner side panel. Electrode and flame probe should remain attached. See Page 47, Section 15.3.
- 3. Remove burner assembly from cabinet via four screws, two on top and two on bottom. Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner.
- 4. Check condition of ignition electrode and flame probe. Clean off any deposits which may have formed, check condition of ceramic insulators. Replace as required. See Page 47, Section 15.3.
- SECTION 14: Troubleshooting
- SECTION 15: Replacement Parts
- See warnings and important information on Page 37, Section 13 before removing or replacing parts.
- Burner Components All serviceable burner parts are accessed by the hinged door on the side of the heater.
- 15.1 Gas Valve
- 15.2 Burner Injectors
- 15.3 Ignition Electrode and Flame Probe
- 15.4 Heat Exchanger
- 15.5 Louver and Louver Springs
- 15.6 Flue Blower Vertical Installation
- 15.7 Pressure Switch
- Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting. Carry out a start-up after working on or changing a press...
- The control mounts to the heat exchanger plate. Pull out ignition cable and wiring from board, noting their positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable and all other wiring.
- The axial fan unit for the heater is supplied completely assembled and balanced.
- SECTION 16: Specifications
- SECTION 17: ADDISON® UHA-Series Warranty
UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
50 of 55
15.7 Pressure Switch
Carbon Monoxide Hazard
Use correct pressure switch specified for each
model.
Use of incorrect pressure switch or disabling
pressure switch circuit could cause unsafe
condition.
Failure to follow these instructions can result in
death or serious injury.
WARNING
Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure
switch for model. The pressure switches are color coded for each pressure setting. Carry out a start-up
after working on or changing a pressure switch. See Page 31, Section 11.
MODEL UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125
Pressure Switch
Kit P/N
90439804 90439804 90439804 90439804 90439810 90439810
Color Code
white white white white black black
Set Point in. wc
0.47 0.47 0.47 0.47 0.35 0.35
Pressure Switch
Snap Ring P/N
90439850 90439850 90439850 90439850 90439850 90439850
15.8 Ignition Control
The control mounts to the heat exchanger plate. Pull out ignition cable and wiring from board, noting their
positions
. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable
and all other wiring.
15.9 Axial Fan/Guard/Motor Assembly
The axial fan unit for the heater is supplied completely assembled and balanced.
MODEL UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125
Axial Fan Guard 91901103 91901103 91901102 91901102 91901102 91901102
Axial Fan Motor 90600104 90600104 90600105 90600105 90600106 90600106
Axial Fan Blade 90709004 90709003 90709002 90709001 90709001 90709001