After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power circuit specifically for the air conditioner. As for
the method of wiring, be guided by the circuit diagram posted on the inside of control
cover.
2) The screw which fasten the wiring in the casing of electrical fittings are liable to come
loose from vibrations to which the unit is subjected during the course of
transportation. Check them and make sure that they are all tightly fastened. (If they
are loose, it could cause burn-out of the wires.)
3) Specification of power source.
4) Confirm that electrical capacity is sufficient.
5) See to that the starting voltage is maintained at more than 90 percent of the rated
voltage marked on the name plate.
6) Confirm that the cable thickness is as specified in the power source specification.
7) Always install an earth leakage circuit breaker in a wet or moist area.
8) The following would be caused by voltage drop.
?
Vibration of a magnetic switch, which will damage the contact point, fuse breaking, disturbance of the
normal function of the overload.
9) The means for disconnection from a power supply shall be incorporated in the fixed
wiring and have an air gap contact separation of at least 3mm in each active(phase)
conductors.
CAUTION
CAUTION
CAUTION
CAUTION
Air and moisture in the refrigerant system have undesirable effects as indicated below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze and block capillary tubing.
●
Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested
and evacuated to remove any noncondensables and moisture from the system.
Air purging with vacuum pump
●
Preparation
Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units
have been properly connected and all wiring for the test run has been completed. Remove
the service valve caps from both the gas and the liquid side on the outdoor unit. Note that
both the liquid and the gas side service valves on the outdoor unit are kept closed at this
stage.
●
Pipe length and refrigerant amount:
AIR PURGING
Air purging
12
Connective
pipe length
Less than 5m
More than 5m
Air purging
method
Use vacuum
pump.
Use vacuum
pump.
Additional amount of refrigerant to be charged
R22: (Pipe length-5)x30g/m
R410A: (Pipe length-5)x20g/m
Liquid side: 6.35
R22: (Pipe length-5)x60g/m
R410A: (Pipe length-5)x40g/m
Liquid side: 9.53
