7
English
PURGING THE REFRIGERANT PIPING
Purging The Piping And The Indoor Unit
Except the outdoor unit which is pre-charged with refrigerant,
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.
• 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 4 mm 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 again.
Outdoor Unit
3 way Valve
Flare
Nut
Refrigerant
Piping
Service
Port
Flexible Hose
4 mm
Allen
Key
Vacuum Pump
Flexible Hose
High Pressure Gauge
Manifold
Low Side
Pressure Gauge
Gas Valve
Refrigerant Piping
Indoor Unit
Outdoor Unit
Liquid Valve