Movincool Office Pro 10 Service Manual download pdf (Page 49)

TROUBLESHOOTING AND REPAIR

41

LOW PRESSURE

VALVE (CLOSED)

HIGH PRESSURE VALVE

(CLOSED)

RED HOSE

PROCESS TUBE FITTING

HIGH PRESSURE

SIDE TUBE

LOW PRESSURE

SIDE TUBE

BLUE HOSE

GREEN HOSE

VACUUM PUMP

(AT A STOP)

LEAVE VALVES CLOSED FOR 5 MINUTES

OR MORE. POINTER OF LOW PRESSURE

GAUGE RETURNING TO ZERO INDICATES

THERE IS A LEAK.

LO

HI

CLOSEDCLOSED

VALVE SETTING

LOW PRESSURE GAUGE

RETURN

BRAZING OF PIPING

LOW PRESSURE

VALVE (CLOSED)

GAUGE

HIGH PRESSURE VALVE

(CLOSED)

HIGH PRESSURE GAUGE

HIGH PRESSURE

SIDE TUBE

LOW PRESSURE

SIDE TUBE

VACUUM PUMP

(IN OPERATION)

VALVE SETTING

LOW PRESSURE GAUGE

750 mmHg OR LARGER

LO HI

OPEN OPEN

LO HI

CLOSED CLOSED

Checking Vacuum

Evacuation

Hose Connection

B. Evacuation

(1) Open the high pressure valve (HI) and the

low pressure valve (LO) of the gauge

manifold.

(2) Turn on the vacuum pump to start

evacuation. (Evacuate the system for

approximately 20 minutes.)

(3) When the low pressure gauge indicates

750mmHg (29.55 in.Hg) or larger, turn off

the vacuum pump and close the high and

low pressure valves of the gauge mani-

fold.

C. Checking Vacuum

(1) Leave the high pressure valve and the

low pressure valve of the gauge manifold

closed for five minutes or more, and

confirm that the gauge pointer does not

return to zero.

(2) If the gauge pointer returns gradually to

zero there is a leak somewhere in the

system (this could also include gauge

manifold). Perform leak check according

to procedure indicated in 28D. Once leak

has been found and repaired evacuate

the system once more, and confirm

system holds vacuum.

NOTE: Connect the hoses using care not to mistake

the high pressure side for the low pressure side and

vice versa.

(3) Connect the charging hoses (red - high

pressure side, blue - low pressure side) of

the gauge manifold to the process tube

fittings.

(4) Connect the charging hose (green) at the

center of the gauge manifold to the

vacuum pump.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 55 56

Comments to this Manuals

No comments