Pipe Connections Between Indoor And Outdoor Unit; U36A Chassis (1 Fan Model); Selection Of Refrigerant Piping - LG MULTI V Series Installation Manual

16
PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT

U36A Chassis (1 FAN model)

Connect the refrigerant pipe, and after the refrigerant leakage
inspection, cover with insulation material and wrap with vinyl tape.
Tighten the flare nut according to the specified torque. (until there is a
"click" sound in the torque wrench part)
The center shall match
Refrigerant pipe
Socket flare
Monkey spanner
Do not bend the pipe 2 or more times, and work with the bigger
radius.
If the pipe is bent, the cooling/heating performance is degraded, and it
may cause failure.
Do not remove the cap of the flare surface until the locking work.
If dust, earth, etc. enters inside the pipe, it may cause failure.
Cap
Pipe
Piping pipe
Bend carefully along the wall, and connect to the outdoor unit valve.
Refrigerant pipe locking torque
Pipe outer diameter
Torque
h The exterior of the product may be different for each model.
Flare nut
Flare nut
Torque wrench
Pipe
Ø 6.35 Ø 9.52 Ø 12.7 Ø 15.88
16±2 38±4 55±6 75±7

Selection of Refrigerant Piping

Outdoor unit
Gas pipe
Liquid pipe
Branching
pipe
Main pipe
Branching
pipe
① Outdoor unit
② Branching section
Piping parts
③ Branching section
① Main pipe
② Branching pipe
Name
③ Indoor unit connecting pipe
① Size of main pipe
Outdoor unit
capacity[HP]
6
5
4
② Pipe size of between branching sections
Selection Indoor unit capacity
[kW(Btu/h)]
of
≤ 5.6(19 100)
pipe size
< 16.0(54 600)
< 22.4(76 400)
③ Connecting pipe size of indoor unit
Indoor unit capacity
[kW(Btu/h)]
≤ 5.6(19 100)
< 16.0(54 600)
≤ 22.4(76 400)
Indoor unit
'
1st branching section
'
Branching section
'
Indoor unit
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø 9.52(3/8) Ø 19.05(3/4)
Ø 9.52(3/8) Ø 15.88(5/8)
Ø 9.52(3/8) Ø 15.88(5/8)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø 6.35(1/4) Ø 12.7(1/2)
Ø 9.52(3/8) Ø 15.88(5/8)
Ø 9.52(3/8) Ø 19.05(3/4)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø 6.35(1/4) Ø 12.7(1/2)
Ø 9.52(3/8) Ø 15.88(5/8)
Ø 9.52(3/8) Ø 19.05(3/4)