SERVICE
Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.
Cleaning Ð Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.
MAIN AND PILOT BURNERS Ð At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the pilot and main burner ¯ames through view port (in condenser section), and adjust if necessary. Refer to Pilot Adjustment or Main Burners sec- tions on pages 22 and 23.
FLUE GAS PASSAGEWAYS Ð The ¯ue collector box and heat exchanger cells may be inspected by removing heat ex- changer access panel (Fig. 4 and 5), ¯ue box cover, and main burner assembly (Fig. 25). Refer to Main Burners section on page 23 for burner removal sequence. If cleaning is re- quired, remove heat exchanger turbulators (Fig. 26) and clean all parts with a wire brush.
To inspect blower wheel, remove heat exchanger access panel. Shine a ¯ashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel assembly by removing screws holding motor mounting plate to top of com- bustion fan housing (Fig. 25 and 26). The motor and wheel assembly will slide up and out of the fan housing. Remove the blower wheel from the motor shaft and clean with a de- tergent or solvent. Replace motor and wheel assembly.
EVAPORATOR COIL Ð Clean as required with commer- cial coil cleaner.
CONDENSER COIL Ð Clean condenser coil annually and as required by location and
CONDENSATE DRAIN Ð Check and clean each year at start of cooling season. In winter, keep drains and traps dry.
FILTERS Ð Clean or replace at start of each heating and cooling season, or more often if operating conditions re- quire. Refer to Table 1 for type and size.
Lubrication
COMPRESSORS Ð Each compressor is charged with the correct amount of oil at the factory. Observe the level in the sight glass immediately after shutdown while the oil is still warm. If the oil level is observed when the oil is cold, the level observed may be a mixture of oil and refrigerant which is not a true indication of the oil level. If oil level observed is not between the low limit and high limit levels as indi- cated in Fig. 27, add oil until it is in the correct range.
Fig. 25 Ð Typical Gas Heating Section
(48HJE015, 48HJE017, and 48HJD025 Shown)
Fig. 26 Ð Typical Heating Section With
Main Burners Removed
(48HJE015, 48HJE017, and 48HJD025 Shown)
Fig. 27 Ð Compressor Sight Glass Oil Level
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