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.
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.
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