86
9) Final Checking
• Ensure that steps 1 to 8 are closely followed.
• Ensure the following, in particular :-
1) The unit is mounted solidly and rigidly in position.
2) Piping and connections are leak proof after charging.
3) Proper wiring has been done.
• Trial run
1) Conduct a trial run after water drainage test and gas leakage test.
2) Watch out for the following :-
a) Is the electric plug firmly inserted into the socket?
b) Is there any abnormal sound from unit?
c) Is there any abnormal vibrations with regard to unit itself or pipings?
d) Is there smooth drainage of water?
• Check that :
1) Condenser fan is running, with warm air blowing off the condensing unit.
2) Evaporator blower is running and discharging cool air.
3) Suction (Low side) pressure as per recommended.
4) The remote controller incorporate a 3 minute delay in their circuit. Thus, it requires about 3 minutes upon cut off
before the outdoor condensing unit can start up.
Diagram shows typical charging method.
Note : R407C – Fix filter dryer
R22 - Nil
R410A - Nil
CAUTION FOR R407C / R410A
Avoid prolong exposure of an opened compressor, or the internal part of refrigerant piping
to moist air. The POE oil in the compressor and piping can absorb moisture from air.
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