LG multi V JRUN Series Installation Manual page 28

Pipe connections between indoor and outdoor unit
Remove leakage prevention cap
• Remove the leakage prevention cap attached to the
outdoor unit service valve before pipe work.
• Proceed the leakage prevention cap removal as follows:
1. Verify whether the liquid/gas/common pipes are
locked.
2. Extract remaining refrigerant or air inside using the
service port.
3. Remove the leakage prevention cap
Method of pipe cap work during the
installation of single outdoor unit
1. Remove rubber cap inserted in the common pipe.
2. Wrap the common pipe service valve with wet towel.
3. Insert the pipe cap provided into the common pipe.
4. Place high/low pressure flare nut cap under the pipe cap so
that the pipe cap does not move.
5. Weld the pipe cap.
If not wrapped with a wet towel, there may be damages
inside the valve.
If the unit is operated without pipe cap work, there may be
abnormality in the cycle caused by refrigerant leakage.
Pipe Drawing Out during Single / Series connection
Method of drawing out pipes on the front side
• Proceed with the pipe work as shown in the below figure for front side pipe drawing out.
28 Outdoor Unit
Pipe Knock Out for
Liquid/Gas pipes
Pipe Knock Out for
common pipes
Liquid pipe
Gas pipe
Common pipe
Leakage Prevention Cap
Common pipe Liquid pipe
Service Port
Pipe Cap
Flare Nut
Gas pipe