Bedienungsanleitung Mitsubishi SKM20ZG-S (Seite 139 von 144) (Englisch)

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8.3.2 New installation work (when using new refrigerant piping)

(1) Air purge by vacuum pump and gas leakage inspection (see Fig. 6)

a) Connect the charge hose to the outdoor unit. 1

b) Connect the charge hose to the vacuum pump adapter. 2

At this time, keep the control valves in the fully closed position. 3 4

c) Place the handle Lo in the fully opened position 5, and turn on the vacuum pump’s power switch.

During this step, perform evacuating (about 10 ~ 15 minutes); for the evacuating time, refer to the equipment manufacturer’s

manual.

d) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg) 6, place the handle Lo in the fully closed position 5,

and turn OFF the vacuum pump’s power switch

Keep this state for 1~2 minutes, and ascertain that the compound gauge’s pointer does not return.

e) Fully open the control valves. 3 4

f) Detach the charge hoses. 1 2

g) Tightly secure the cap on the service port. 7

h) After securing the caps on the control valves, check the caps’ periphery if there is any gas leakage. 3 4 7

(2) Additional refrigerant charging required for refrigerant piping length longer than standard length (The following steps should be

taken following the step e) in (1) above. See Fig. 7)

a) Set the refrigerant cylinder to the electronic balance, and connect the connecting hoses on the cylinder and electronic balance’s

connecting port.

* Caution:

Be sure to make setting so that liquid can be charged. When using a cylinder equipped with a siphon, liquid can be charged

without turning it upside down.

b) Connect the gauge manifold’s charge hose to the electronic balance’s connecting port. 3 2

c) Open the refrigerant cylinder’s valve, and, after opening the charging valve a little, close it. 1 2

d) After making zero (0) adjustment, open the charging valve and, by opening the gauge manifold’s valve Lo, charge the liquid

refrigerant. 2 5

(Before handling the electronic balance, refer to its instruction manual).

e) When the designated amount of refrigerant could not be charged, make additional charging bit by bit by cooling operation (for

the amount of each addition, follow the instruction manual prepared by the equipment manufacturer). If the first additional

charging was not enough, make the second additional charging after about one minute in the same manner as the first addi-

tional charging.

* Caution:

Be sure never to charge a large amount of liquid refrigerant at once to the unit in cooling mode, since liquid is charged from

the gas side.

Fig.6 Configuration of air purge by vacuum pump

1 Charge hose

3 Control valve (2-way)

5 Handle Lo

6 Compound pressure

gauge

Gauge manifold

8 Handle Hi (always closed)

2 Charge hose

Vacuum pump adapter

Vacuum pump

7 Service port

4 Control valve

(3-way)

-76cmHg

Caution:

• Be sure to use the vacuum pump, vacuum pump adapter and

gauge manifold to refer to their instruction manuals beforehand.

• Ascertain that the vacuum pump is filled with oil to the level

designated on the oil gauge.

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