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SCHEDULED MAINTENANCE
The owner should be made aware of the fact, that, as with any
mechanical equipment the Package Cooling and Heat Pump
units require regularly scheduled maintenance to preserve high
performance standards, prolong the service life of the equip-
ment, 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 the filters more often. If permanent type filters are
used, they should be washed with warm water, dried and
sprayed with an adhesive according to manufacturers
recommendations.
2. When operating on the cooling cycle, inspect the conden-
sate 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 casing of the outdoor unit 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 connections
are tight. Inspect wire insulation to be certain that it is
good.
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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.
8. Check the combustion chamber (Heat Exchanger) for soot,
scale, etc. Inspect all burners for lint and proper position-
ing.
9. Start the system, using the proper instrumentation check
gas inlet and manifold pressures, burner flame and microamp
signal. Adjust if necessary.
10. Start the system and run both a Cooling & Heating Perfor-
mance Test. If the results of the test are not satisfactory,
see the "Service Problem Analysis" Chart of the possible
cause.
TEST EQUIPMENT
Proper test equipment for accurate diagnosis is as essential
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 amperage and voltage.
4. Volt-Ohm Meter - testing continuity, capacitors, and motor
windings.
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 Electronic Scale - measure proper refrigerant
charge.
9. Inclined Manometer - measure static pressure and pres-
sure drop across coils.
Other recording type instruments can be essential in solving
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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