EVACUATION
CAUTION
N
CAUTION
After complying to 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 screws which fasten the wiring in the electrical box are liable to come loose
from vibrations which the unit is subjected to during the course of transportation. Check
them and make sure that they are all tightly fastened. (If they are loose, it could cause
the wires to burn out.)
3)
Specification of power source.
4)
Confirm that electrical capacity is sufficient.
5)
Check that the starting voltage is maintained at more than 90 percent of the rated voltage
marked on the nameplate.
6)
Confirm that the cable thickness is as specified in the power source specification
.
7)
Always install a GFI circuit breaker in a wet or moist area.
8)
The following could cause a voltage drop
:
Vibration of a magnetic switch, which will damage the contact point. Also a bad fuse or breaker
could cause a voltage drop.
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
.
Evacuation
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.
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.
Evacuation 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:
Lineset
Air purging
pipe length
method
Additional amount of refrigerant to be charged
Less than 5m
Use vacuum
pump.
Use vacuum
More than 5m pump.
R410A: (Pipe length-5)x20g/m
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