Movincool Office Pro 10 Service Manual download pdf (Page 50)

TROUBLESHOOTING AND REPAIR

42

LO HI

OPEN OPEN

LO HI

CLOSED CLOSED

VALVE SETTING

LOW PRESSURE

GAUGE READING

VALVE OF

REFRIGERANT

CYLINDER

(OPEN)

LOW PRESSURE VALVE

(CLOSED)

OPEN HIGH PRESSURE VALVE

PROCESS TUBE FITTING

HIGH PRESSURE

SIDE TUBE

LOW PRESSURE

SIDE TUBE

REFRIGERANT

CYLINDER R-22

LOW PRESSURE GAUGE

4 kg/cm

2

G (57 psiG)

4 kg/cm

2

G

(57 psiG)

LO HI

OPEN OPEN

LO HI

CLOSED CLOSED

VALVE SETTING

LOW PRESSURE GAUGE

750 mmHg OR LARGER

GAUGE

LOW PRESSURE

VALVE

VACUUM PUMP

(IN OPERATION)

HIGH PRESSURE

SIDE TUBE

LOW PRESSURE

SIDE TUBE

HIGH PRESSURE VALVE

HIGH PRESSURE GAUGE

AIR PURGING

BLUE

RED

TO PROCESS TUBE FITTING

CHARGING HOSE (GREEN)

OPEN THE VALVE

OF REFRIGERANT

CYLINDER

REFRIGERANT

CYLINDER R-22

LO HI

CLOSED CLOSED

VALVE SETTING

Still Checking Gas Leak

Evacuation

Checking Gas leak

(2) Loosen the nut on the gauge manifold

side of the charging hose (green).

(3) Open the high pressure valve of the

gauge manifold. Charge the system with

refrigerant until the low pressure gauge

indicates 57 PSIG. (4 kg/cm

2

G.) After

charging is complete, close the high

pressure valve.

(4) Check carefully for gas leaks inside the

refrigerant system using the gas leak

tester.

(5) Repair any leak.

WARNING: Do not attempt any repair on a

charged system.

WARNING: Before checking for gas leaks, fully

confirm that there is nothing flammable in the

area to cause an explosion or fire. Contact of

refrigerant with an open fire generates toxic gas.

E. Evacuation (Repeat)

(1) Close the valve of the refrigerant cylinder.

Then remove the charging hose (green)

from the refrigerant cylinder, and connect

it to the refrigerant recovery machine.

NOTE: Keep the high pressure valve and the low

pressure valve of the gauge manifold closed.

(2) Using procedure 28B., evacuate the

system until the low pressure gauge

indicates 750mmHg (30in.HG) or greater.

(For 15 minutes or more.)

(3) After evacuation is complete, close the

high and the low pressure valves of the

gauge manifold.

CAUTION: Be sure to evacuate the system twice

or more using the repetitive vacuum method.

Evacuate the system an additional time on rainy

or humid days.

D. Checking Gas Leak

(1) Remove the charging hose (green) from

the vacuum pump, and connect the hose

to the refrigerant cylinder (R-22).

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