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UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K
MAINTENANCE
⚠ WARNING ⚠
• If you turn OFF the electrical power supply, turn OFF the gas.
• Eye protection is recommended when cleaning unit.
⚠ CAUTION ⚠
• When any service is completed, ensure that the unit is reassembled correctly so that no unsafe
conditions are created.
• When re-lighting, always follow the lighting instructions on the heater.
• If any of the original wire supplied with the appliance must be replaced, it must be replaced
with wiring material having a temperature rating of at least 105°C, except for limit control, flame
rollout, and sensor lead wires which must be rated at 150°C.
• If replacement parts are required, use only factory-authorized parts.
NOTE: To ensure long life and satisfactory performance, a heater that is operated under normal
conditions should be inspected and cleaned at the start of each heating season. If the heater is
operating in an area where an unusual amount of dust or soot or other impurities are present in
the air, more frequent maintenance is recommended.
The unit is designed to operate with a minimum of maintenance. However, to ensure long life and satisfactory
performance, routine service is recommended. When servicing, follow standard safety procedures and those specific
instructions and warnings in this manual. The following is designed to aid a qualified service person in maintaining
and servicing this equipment.
Service Checklist
At a minimum, perform the following annually (see Figure 11 for component locations):
Inspect burner/control compartment annually to determine if cleaning is necessary.
Clean all dirt, lint, and grease from combustion air opening (models UBX and UDX) and venter assembly.
Clean all dirt, lint, and grease from fan blade, fan guard, and motor.
Check heat exchanger both internally and externally.
Check burner for scale, dust, or lint accumulation and clean if needed.
Check gas valve to ensure that gas flow is being shut off completely.
Check vent or vent/combustion air system for soundness and clean openings.
Replace any parts that do not appear sound.
Check for any damaged wiring and replace as necessary.
Maintenance Procedures
Burner Maintenance
Visually inspect the burner compartment (see Figure 15). If there is an accumulation of dirt, dust, and/or lint,
clean the compartment and remove and clean the burner as follows:
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