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HPXA16 SERIES
Maintenance
WARNING
Electric shock hazard. Can cause inju-
ry or death. Before attempting to per-
form any service or maintenance, turn
the electrical power to unit OFF at dis-
connect switch(es). Unit may have
multiple power supplies.
Before the start of each heating and cooling season, the
following service checks should be performed by a quali-
fied service technician. First, turn off electrical power to the
unit prior to performing unit maintenance.
Inspect and clean the 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
(e.g., 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 the 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, if necessary.
Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
Check drive belt for wear and proper tension.
NOTE − If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked. Re-
fer to section on refrigerant charging in this instruction.
Optional Accessories
Refer to the Engineering Handbook for optional accesso-
ries that may apply to this unit. The following may or may
not apply:
Loss of charge kit
High pressure switch kit
Compressor monitor
Compressor crankcase heater
Hail guards
Mounting bases
Timed-off control
Stand−off Kit
Sound cover
Low ambient kit
Monitor kit
Dave Lennox
SignatureStat
Room Thermostat