MovinCool Office Pro W20 Service Manual - Manual (Page 70)

Repair Section
70
(1) Connection of gauge manifold
1) Properly remove the crushed end of the pinch-off
tubes at the high pressure side and the low
pressure side of the refrigerant cycle with a pipe
cutter.
2) Fit the process tube fitting to the pinch-off tube on
both sides.
3) Connect the charging hoses (red-high pressure
side) for the gauge manifold to the process tube
fitting.
< NOTE >
Connect the hoses using care not to mistake
the high pressure side for the low pressure side
and vice versa.
4) Connect the charging hose (green) at the center
of the gauge manifold to the vacuum pump.
(2) Evacuation
1) Open the high pressure valve (Hl) of the gauge
manifold.
2) Turn on the vacuum pump to start evacuation.
(Evacuate the system for approximately 15
minutes.)
3) When the low pressure gauge indicates 30 inHg
(100 kPa) or larger, turn off the vacuum pump
and close the high pressure valves of the gauge
manifold.
I002183
Pinch-Off Tube
Seal
Charging Hose
Side
Refrigerant
Cycle Side
I000568
High Pressure Valve
(Closed)
High Pressure
Side Tube
Vacuum Pump
(when stopped)
Low Pressure
Valve (Closed)
Red Hose
Green Hose
Process Tube Fitting
I002227
LO
Closed
HI
Open
LO
Closed
HI
Closed
Valve Setting
30 inHg (100 kPa) or larger
High Pressure Valve
High Pressure Gauge
Gauge
High Pressure
Side Tube
Vacuum Pump
(in Operation)
Low Pressure
Valve