Movincool Office Pro 10, Руководство по обслуживанию

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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.