Haier HPU-90CA03T3 operation manual Check for leakage, Vacuum Pumping

Installation procedure

Outdoor unit

Check for leakage

In the case of pressure decrease during steps 1 to 3 ,check the joints with the ear,hand or soapsuds for leakage.Repair it by welding or tighten the connecting nut up.

Vacuum Pumping

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 High-pressure

gauge gauge

			Three-way valve fully
Indoor	Outdoor		closed(gas side)	VL VH
				Gauge distributor
Solder joint		Solder joint	Access hole
				6.4
				Copper

pipe

Tightly	Solder
closed
	joint	Access hole

Indoor unit

Outdoor unit

Three-way valve fully closed liquid side

Detailed diagram of the three-way valve

6.4Relief valve

Copper pipe

Nitrogen bottle

To the gauge
distributor		(Gas side)three-way valve
	(Liquid side)three-way valve
	To the unit	(Gas side )
		access hole
(Liquid side)access hole

To the unit

Field tube
installation	Field tube
	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 onthe 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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