Haier AU282XHERA, AU342XHERA installation manual Purging method to use vacuum pump

Purging method: to use vacuum pump

1 .Detach the service portis cap of 3-way valve, the valve rod's cap for 2-way valve and 3-way valves, connect the service port into the projection of charge hose (low) for gaugemanifold. Then connect the projection of charge hose (center) for gaugemanifold into vacuum pump.

2 .Open the handle at low in gaugemanifold, operate vacuum pump. If the scale-moves of gause (low) reach vacuum condition in a moment, check 1 again.

3 .Vacuumize for over 15min. And check the level gauge which should read -0.1MPa (-76 cm Hg) at low pressure side. After the completion of vacuumizing, close the handle 'Lo' in the vacuum pump. Check the condition of the scale and hold it for 1-2min. If the scale-moves back in spite of tightening, make flaring work again, then return to the beginning of 3 .

4 .Open the valve rod for the 2-way valve to and an angle of anticlockwise 90 degree. After 6 seconds, close the 2- way valve and make the inspection of gas leakge.

5 .No gas leakage?	In case of gas leakage, tighten
	parts of pipe connection. If
	leakage stops, then proceed 6
	steps.

6 .Detach the charge hose from the service port, open 2- way valve and 3-way. Turn the valve rod anticlockwise until hitting lightly.

7 .To prevent the gas leakage, turn the service ports cap, the valve rodis cap for 2-way valve and 3-way's a little more than the point where the torque increases suddenly.

8 .Take the same steps from 1 to 7 for each ways to ensure a completely vacuum for the whole system.

CAUTION: If the refrigerant of the air conditioner leaks, it is necessary to make all the refrigerant out. Vacuumize first, then charge the liquid refrigerant into air conditioner according to the amount marked on the name plate.

Liquid stop valve

	Gas stop valve
2 way valve
3 way valve	Gauge maifold(R410A)
	Vacuum pump(R410A)

Open

Close

2 way valve

3 way valve 900

Service port

900 for 6 sec.

If it does not stop gas leakage, discharge whole refrigerants from the service port. After flaring work again and vacuumize, fill up prescribed refrigerant from the gas

cylinder.

2 way valve

		6
3 way valve
		6
2 way valve
3 way valve		Valve rod cap
		Valve rod cap
Service port cap
3 way valve	9.52mm	To indoor unit A
	(3/8")
2 way valve	6.35mm
	(1/4")
3 way valve	9.52mm	To indoor unit B
	(3/8")
2 way valve	6.35mm
	(1/4")
3 way valve	9.52mm	To indoor unit C
	(3/8")
2 way valve	6.35mm
	(1/4")
3 way valve	9.52mm	To indoor unit D
	(3/8")
2 way valve	6.35mm
	(1/4")

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