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

SECTION 2: INSTALLER RESPONSIBILITY
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SECTION 2: INSTALLER RESPONSIBILITY
The installer is responsible for the following:
• To install the heater, as well as the gas and
electrical supplies, in accordance with applicable
specif
ications and codes. Addison
recommends the installer contact a Local
Building Inspect
or or Fire Marshal for guidance.
• To use the information given in a layout drawing
and in the man
ual together with the cited codes
and regulations to perform the installation.
• To install the heater in accordance with the
clearances to combustibles.
• To furnish all needed materials not supplied as
st
andard equipment.
• To plan location of supports, vents and air
int
akes.
• To provide access for servicing.
• To provide the owner with a copy of this
Installation, Operation and Service Manual.
• To never use heater as support for a ladder or
other access equipment and ne
ver hang or
suspend anything from heater.
• To ensure there is adequate air circulation
ar
ound the heater and to supply air for
combustion, ventilation and distribution in
accordance with local codes.
• To ensure the heater is placed in an approved
application.
2.1 Wall Tag
A laminated wall tag is included with the heater as a
per
manent reminder of the safety instructions and
the importance of the required clearances to
combustibles. Affix the tag by peeling off the backing
of the adhesive strips on the rear surface and
position the tag on a wall near the heater.
A copy of the wall tag (P/N 91040097) is illustrated
on the bac
k cover.
Know your model number and installed
conf
iguration. Model number and installed
configuration are found on the heater serial plate
and throughout the Installation, Operation and
Service Manual.
2.2 Corrosive Chemicals
CAUTION
Product Damage Hazard
Do not use heater in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.
Addison cannot be responsible for ensuring that all
appropriate safety measures are undertaken prior to
installation; this is entirely the responsibility of the
installer. It is essential that the contractor, the sub-
contractor, or the owner identifies the presence of
combustible materials, corrosive chemicals or
halogenated hydrocarbons* anywhere in the
premises.
* Halogenated Hydrocarbons are a family of chemical
compounds characterized by the presence of halogen ele-
ments (fluorine, chlorine, bromine, etc.). These compounds are
frequently used in refrigerants, cleaning agents, solvents, etc. If
these compounds enter the air supply of the burner, the life
span of the heater components will be greatly reduced. An out-
side air supply must be provided to the burners whenever the
presence of these compounds is suspected. Warranty will be
invalid if the heater is exposed to halogenated hydrocarbons.
2.3 National Standards and Applicable Codes
All appliances must be installed in accordance with
the lat
est revision of the applicable standards and
national codes. This refers also to the electric, gas
and venting installation. Note: Additional standards
for installations in public garages, aircraft hangars,
etc. may be applicable. See Page 9, Section 5.










