Air purge, Air purging with vacuum pump

Caution:

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 al! tightly fastened. (tf 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 wi!l 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.

Air purge

The air and moisture that remain in the refrigeration system have undesirable effects, as detailed below:

Air purging with vacuum pump

1.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.

2.When relocate the unit to another place, perform evacuation using vacuum pump.

3.To type refrigerant R407C, make sure the refrigerant added into the air conditioner is liquid form in any case.

4.Pipe length and refrigerant amount:

Caution in handling the packed valve

1.Open the valve stem until it hits against the stopper. Do not try to open it further.

2.Securely tighten the valve stem cap with aspanner or the like. Valve stem cap tightening torque (See tightening torque table in page 17).

1.Pressure in the system rises.

2.IOperating current rises..

3 Cooling or heating efficiency drops.

4.TMoisture in the refrigerant circuit may freeze and block capillary tubing.

5.VVater may lead to corrosion of

parts in the refrigeration system.

6.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..

Refrigerant				_//	Flare nut
outdoor unit	indoor		unit	7"
outdoor unit	indoor		unit
A	Gas	C	--		Stopper

Packed valve	Valve body	'	_
Half union
	Valv_	stem

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