Haier AD842AHEAA, AU84NATEAA Pipe Vacuumizing, Installation Precedure, Outdoor Unit

Installation Precedure

Outdoor Unit

7. Pipe Vacuumizing

Use vacuum pump to evacuate the air. Never use the refrigerant for the evacuation.

Drain off the nitrogen gas after the leak test and then connect the vacuum pump as shown in the figure below. The vacuum pumping must be done from both the liquid and gas inlets.

				Low-pressure gauge High-pressure gauge
				Three-way valve fully closed
Indoor	Outdoor			(gas side)	VL VH	Gauge distributor
Tightly				6.4Copper pipe
			Solder			6.4Copper pipe
closed	Solder joint
			joint
				Access hole
						P
Tightly			Tightly			Vacuum pump
closed	Solder joint
			closed	Access hole
Indoor unit
				Outdoor unit
				Three-way valve fully closed
				liquid side
Detailed diagram of the three-way valve
To the gauge distributor			(Gas side) access hole
			(Gas side) three-way valve
(Liquid side)access hole				To the unit
(Liquid side)three-way valve
		unitthe oT
Field tube		Field tube
installation		installation

Use a vacuum pump with high degree of vacuum(below-755mmHg) and large volume displacement (above 40L/min).

The pumping time depends on the length of the connecting pipe. Generally, it takes about 2-3 hours. Make sure that the Y-shaped valves on both the gas and liquid sides are closed before pumping.

If the vacuum can no reach-755mmHg within 2 hours, continue pumping for another 1 hour.

If the vacuum can no reach-755mmHg after more than 2 hour's pumping, close the valves VL and VH on the gauge distributor and stop pumping. One hour later, check the vacuum again. If the vacuum has changed, it means there is a leakage. Repair it. After the above steps, replace the vacuum pump with the refrigerant pump and refill refrigerant.

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