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SCHEDULED MAINTENANCE
Package heat pumps require regularly scheduled mainte-
nance to preserve high performance standards, prolong the
service life of the equipment, and lessen the chances of costly
failure.
In many instances the owner may be able to perform some
of the maintenance; however, the advantage of a service con-
tract, which places all maintenance in the hands of a trained
serviceman, should be pointed out to the owner.
WARNING
ONCE A MONTH
1. Inspect the return filters of the evaporator unit and clean
or change if necessary. NOTE: Depending on operation
conditions, it may be necessary to clean or replace the
filters more often. If permanent type filters are used, they
should be washed with warm water and dried.
2. When operating on the cooling cycle, inspect the con-
densate line piping from the evaporator coil. Make sure
the piping is clear for proper condensate flow.
ONCE A YEAR
Qualified Service Personnel Only
1. Clean the indoor and outdoor coils.
2. Clean the cabinet inside and out .
3. Motors are permanently lubricated and do not require oil-
ing. TO AVOID PREMATURE MOTOR FAILURE, DO NOT
OIL.
4. Manually rotate the outdoor fan and indoor blower to be
sure they run freely.
5. Inspect the control panel wiring, compressor connections,
and all other component wiring to be sure all connec-
tions are tight. Inspect wire insulation to be certain that
it is good.
6. Check the contacts of the compressor contactor. If
they are burned or pitted, replace the contactor.
7. Using a halide or electronic leak detector, check all
piping and etc. for refrigerant leaks.
TEST EQUIPMENT
Proper test equipment for accurate diagnosis is as essen-
tial as regular hand tools.
The following is a must for every service technician and
service shop:
1. Thermocouple type temperature meter - measure dry
bulb temperature.
2. Sling psychrometer- measure relative humidity and wet
bulb temperature.
3. Amprobe - measure current.
4. Volt-Ohm Meter - testing continuity, capacitors, motor
windings and voltage.
5. Accurate Leak Detector - testing for refrigerant leaks.
6. High Vacuum Pump - evacuation.
7. Electric Vacuum Gauge, Manifold Gauges and high
vacuum hoses - to measure and obtain proper vacuum.
8. Accurate Charging Cylinder or Electronic Scale - mea-
sure proper refrigerant charge.
9. Inclined Manometer - measure static pressure and pres-
sure drop across coils.
Other recording type instruments can be essential in solv-
ing abnormal problems, however, in many instances they
may be rented from local sources.
Proper equipment promotes faster, more efficient service,
and accurate repairs with less call backs.