Step 5) Pipe Connection - LG MULTI V WATER IV ARWN080LAS4 Engineering Product Data Book

MULTI V Water IV
6. Installation

Step 5) Pipe connection

1) Follow the pipe path. Bend the pipe more than 3 times in 1 location and do not bend in the opposite direction.
(This will strengthen the pipe.)
2) After deforming the pipe, align the union fitting and center of the pipe, and tighten it with the wrench.
3) Connect the pipe to the service valve of the outside unit.
4) After finishing the piping work, check if there is any gas leakage
5) For the flare nut, always use the material that complies with Standard or better.
6) After completing the connection of the pipe, vacuum dry the indoor unit and the connecting pipe.
For the vacuum drying, you must use service ports of both the gas and liquid pipes.
Pipe Size (mm)
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
CAUTION
When using two wrenches, tighten at regulated torque
* For the pipe connection, use the method of connecting the end of the pipe to the branch pipe. The refrigerant
pipe coming out from the outside unit is branched out at the end and is individually connected to the indoor unit.
WARNING
• Always be careful not to leak the refrigerant during the welding.
• When the refrigerant is combusted, it generates a toxic poisonous gas.
• Do not execute the welding work in a closed location.
• Always do a leakage test after welding the pipes.
Open status when both the pipe and
the valve are in a straight line.
WARNING
After completing work, securely tighten both service ports and caps so that gas does not leak.
* High/low pressure side is the ball valve that is opened and closed by 1/4 rotation
1) Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen blow into the service valve
port.(Releasing pressure : 0.02 MPa or less)
2) Flare nut: Loose or tighten flare nut by using the wrench with both ends. Coat the flare connection part with
oil for the compressor.
3) Cap: Remove caps and operate valve, etc. After operation, always reattach caps (tightening torque of valve
cap: 25Nm (250kg-cm) or more).
(Don't remove the internal part of the port)
Heat Pump
CLOSE
Tightening Torque
(N·m)
18~25
34~42
55~66
63~82
99~121
Cut both the pipe and the valve with a
cutter to suit the length
(Don't cut the length of less than 70mm)
OPEN
Installation of Outside Units
(kgf·cm)
180~250
340~420
550~660
630~820
990~1,210
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