Hitachi HSU-09RD03/R2(SDB) Outdoor unit, Purging Method To use vacuum pump, Open Close

Outdoor unit

5.Purging Method:To use vacuum pump

2-way valve Liquid Side

3-way valve Gas Side

1

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

2

Open the handle at Iow in gaugemanifold, operate

vacuum pump. If the scale-moves of gause (Iow)

reach vacuum condition in a moment, check 1 again.

3

Vacuumize for over 15min. And check the level gauge which should read -0.1 MPa (-76 cm Hg) at Iow pressure side. After the completion of vacuumizing, close the handle 'Lo' in gaugemanifold and stop the operation of 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, the return to the beginning of 3 .

4

Open the valve rod for the 2-way valve to an angle of anticlockwise 90 degrees.

After 6 seconds, close the 2-way valve and make the inspection of gas leakage.

Tube(for R410A)

Open

Close

Open

90O

Gaugemanifold(for R410A)

Anti countercurrent joint

Vacuum pump(for R410A)

2-way valve

3-way valve

5

In case of gas leakage, tighten

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

No gas leakage?

parts of pipe connection. If

leakage stops, then proceed 6 steps.

fill up prescribed refrigerant from the gas cylinder.

2-way valve

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 port's cap, the valve rod's cap for 2-way valve and 3-way's a little more than the point where the torque increases suddenly.

3-way valve

6

6	2-way valve 3-way valve
	2-way valve

3-way valve

8	7 Valve rod cap
After attaching the each caps, check the gas leakage	7 Valve rod cap
around the caps.	7 Service port cap

CAUTION:

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

2.Please do not let other cooling medium, except specified one (R410A),

or air enter into the cooling circulation system. Otherwise, there will be

abnormal high pressure in the system to make it crack and lead to

personal injuries.

7