Purging The Refrigerant Piping - McQuay CC10C Installation Manual

PURGING THE REFRIGERANT PIPING

Purging the piping and the indoor unit
Except the outdoor unit which is pre-charged with refriger-
ant R22, the indoor unit and the refrigerant connection pipes
must be air purged because the air that contain moisture
remaining in the refrigerant cycle may cause malfunction to
the compressor.
The outdoor unit is equipped by two 3 ways refrigerating
connecting valves. The suction valve is the larger one while
the small one is the liquid valve. Both valves are supplied
with service port valve for connection to a manometer.
Refrigerant
Flare
Piping
Nut
Service
Outdoor Unit
Port
3 way Valve
OUTDOOR UNIT
LIQUID VALVE
CCC-0700 (01~16) ENG*
Flexible Hose
4mm
Allen
Key
REFRIGERANT PIPING
LOW SIDE
PRESSURE GAUGE
GAS VALVE
MANIFOLD
12
• Remove the caps from the valve and the service port.
• Connect the center manifold gauge with the vacuum
pump.
• Connect the manifold gauge to the service port of the 3
ways valve.
• Start the vacuum pump. Check the low pressure manifold
gauge until it indicate 0.9 bar. The evacuation time varies
with each vacuum pump capacity but generally in half
an hour.
• Close the manifold valve and stop the vacuum pump.
• On the outdoor unit, open the suction and liquid valve
(anti clockwise) with 4mm key for hexagon sacked screw.
• The air conditioner unit is ready for start.
• If the reading is close to 0, the refrigerant circuit must be
evacuated (by vacuum pump) and charged (R22) again.
INDOOR UNIT
HIGH PRESSURE GAUGE
FLEXIBLE HOSE
VACUUM PUMP
1-12
2/1/01, 10:42 AM