12. Maintenance and
Service
WARNING: If you turn
off the power supply,
turn off the gas. See
Hazard Levels, page 2.
The material contained in the MAINTENANCE AND SERVICE Section of
this manual is designed to aid a qualified service person in maintaining and
servicing this equipment. This heater will operate with a minimum of main-
tenance. 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.
When any service is completed, be careful to reassemble correctly to
ensure that no unsafe conditions are created. When re-lighting, always fol-
low the lighting instructions on the heater.
Burner Removal
Instructions (Refer to
FIGURE 27.)
12.1
Maintenance
Schedule
The following procedures should be carried out at least annually (See
FIG-
URE 28, page 43,
and Paragraphs 12.2.1 - 12.2.16.):
Clean all dirt, lint, and grease from the combustion air opening and
venter assembly.
Clean all dirt, lint, and grease from the fan blade, fan guard, and motor.
Clean the condensate traps.
Check the heat exchanger both internally and externally.
Check the burner for scale, dust, or lint accumulation. Clean if needed.
Check gas valve to ensure that gas flow is being shutoff completely.
Check the vent/combustion air system for soundness. Clean openings.
Replace any parts that do not appear sound.
Check the wiring for any damaged wire. Replace damaged wiring. (See
Paragraph 8 for replacement wiring requirements.)
NOTE
: If replacement parts are required, use only factory-authorized
parts.
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12.2 Maintenance
Procedures
12.2.1 Heat Exchanger Maintenance
This heater has a
T
CORE
3
®
heat exchanger (patent pending).
Remove any external dirt or dust accumulation. Visually check the heat
exchanger for cracks and holes. If a crack or hole is observed, replace the
heat exchanger. A
T
CORE
3
®
heat exchanger has a primary and a second
-
ary heat exchanger; check both sections.
NOTE: Inspection of the lower portion of the heat exchanger is done with
the burner removed. See the Burner Service section below for information
on inspecting the lower portion of the heat exchanger.
12.2.2
Burner Maintenance
This heater is equipped with a
T
CORE
2
®
burner (U.S. Patent No.
6,889,686).
Inspect the burner/control compartment annually to determine if cleaning
is necessary. If there is an accumulation of dirt, dust, and/or lint, clean the
compartment and follow the instructions below to remove and clean the
burner.
CAUTION: Use of eye protection is recommended.
1.
Outside the cabinet, shut the gas supply off at the manual valve ahead
of the union.
Form I-UEAS, Page 40
