MAINTENANCE
WARNING
Before performing maintenance operations on system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death.
Before the start of each heating and cooling season, the following service checks should be performed by a qualified service technician.
•Inspect and clean outdoor and indoor coils. The outdoor coil may be flushed with a water hose.
NOTE: It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (such as pet urine, cottonwood seeds, etc...).
•Visually inspect the refrigerant lines and coils for leaks.
•Check wiring for loose connections.
•Check voltage at the indoor and outdoor units (with units operating).
•Check amperage draw at the outdoor fan motor, compressor, and indoor blower motor. Values should be compared with those given on unit nameplate.
•Check, clean (or replace) indoor unit filters.
•Check the refrigerant charge and gauge the system pressures.
•Check the condensate drain line for free and unob- structed flow. Clean drain line, if necessary.
•Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM.
•Belt drive blowers: Check drive belt for wear and proper tensions.
If insufficient cooling is reported, the unit should be gauged and refrigerant charge checked (see Refrigerant Charging on page 12).
Page 25 | Issue 1004 |
