Air Purging - LG MW122C4 Installation Manual

AIR PURGING

The air which contains moisture remaining in the
refrigeration cycle may cause a malfunction on the
compressor. After connecting the indoor and outdoor
units, release air and moisture from the refrigerant
cycle using a vacuum pump, as shown below.
NOTE
• To protect the environment, be sure not to
discharge the refrigerant to the air directly.
How to Purge Air Tubes
1
Unscrew and remove caps from 2 and 3-way
valves.
2
Unscrew and remove cap from service valve.
3
Connect vacuum pump flexible hose to the
service valve.
4
Start vacuum pump for 10-15 minutes until
reaching a vacuum of 100 Pa absolutes.
5
With vacuum pump still running close the low
pressure knob on vacuum pump manifold. Then
stop the vacuum pump.
6
Open 2-way valve ,1/4 turn, then close it after 10
seconds. Check tightness of all joints using liquid
soap or an electronic leak detector.
7
Turn 2 and 3-way valves stem to fully open the
valves. Disconnect the flexible vacuum pump
hose.
8
Replace and tighten all valve caps.
Refrigerant flow direction
Service
port nut
2 Turn
8 Tighten
Vacuum
pump
3-way valve diagram
Connect to
outdoor unit
Valve core
Indoor unit
3-way valve
6 Open 1/4 turn
7 Turn to fully
open the valve
1 Turn
Valve cap
Valve cap
8 Tighten
Connect to indoor unit
Open position
EN
2-way valve
7 Turn to fully
open the valve
1 Turn
8 Tighten
Spindle
Needle
Service port
cap
19