LG Multi V PRHR033 Installation Manual page 14

14
WARNING
!
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity of the indoor unit connected after branching, use an
appropriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
For Heat Pump System Installation
Precautions on Pipe connection / valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare
connection for the indoor unit, and welding connection for the outdoor
pipe and the branching parts.
WARNING
!
Always use extreme care to prevent the refrigerant gas (R410A)
from leakage while using fire or flame. If the refrigerant gas comes
in contact with the flame from any source, such as a gas stove, it
breaks down and generates a poisonous gas which can cause gas
poisoning. Never perform brazing in an unventilated room. Always
conduct an inspection for gas leakage after installation of the
refrigerant piping has been completed.
Cautions in pipe connection/valve operation
Open status when both the pipe and the valve are
in a straight line.
Cut both the pipe and the valve with a cutter to
suit the length
[Don't cut the length of less than 70 mm
(2-3/4")]
CLOSE OPEN
WARNING
!
After completing work, securely tighten both service ports and
caps so that gas does not leak.
Ball Valve
Elbow
(Liquid Pipe)
Ball Valve(Gas Pipe)
① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen
blow into the service port.(Releasing pressure : 0.02 MPa(2.9 psi) or
less)
② Cap: Remove caps and operate valve, etc. After operation, always
reattach caps (tightening torque of valve cap: 25 N·m (250 kg·cm) or
more). (Don't remove the internal part of the port)
③ Service port: Make the refrigerant pipe vacuum and charge it using
the service port. Always reattach caps after completing work
(tightening torque of service cap: 14 N·m (140 kg·cm) or more).
④ Liquid pipe
⑤ Gas pipe
⑥ Elbow joint (field supply)
h Remove the front panel before pipe
connection
h Must check the pipe (liquid pipe, gas
pipe) before pipe connection
h In case of the heat pump system
installation, be sure to maintain to
close no use pipe like picture.
Connection of Outdoor units
When installing ODU series, refer below picture.
A
(Master)
A ≥ B ≥ C
① IDU side connection pipe
② ODU to ODU connection pipe (1st branch)
③ ODU to ODU connection pipe (2nd branch)
2, 3 Outdoor Units
Outdoor Units Model
Ⓐ
2 Unit
ARCNN21
Liquid pipe
Not used (keep closed) Not used (keep closed) Not used (keep closed)
Gas pipe
B C
(Slave1) (Slave2)
[Unit : mm(inch)]
Pipe
Liquid Pipe
O.D 15.88(5/8) I.D 19.05(3/4)
331(13-1/32)
314(12-3/8)
I.D 15.88(5/8) I.D 15.88(5/8)
83
I.D 12.7 I.D 9.52
I.D 19.05(3/4)
(3-9/32)
(1/2) (3/8)
O.D 19.05(3/4)
I.D 22.2(7/8)
I.D 12.7(1/2) I.D 15.88(5/8)
70(2-3/4) O.D 12.7(1/2) I.D 9.52(3/8)
O.D 15.88(5/8) I.D 19.05(3/4)
Gas Pipe
I.D 22.2 O.D 28.58 I.D 34.9
(7/8) (1-1/8) (1-3/8)
416(16-3/8)
408(16-1/16)
I.D 28.58(1-1/8) I.D 22.2(7/8)
111
I.D 28.58
I.D 31.8(1-1/4) I.D 34.9(1-3/8) (4-3/8)
(1-1/8)
I.D 41.3 I.D 38.1
(1-5/8) (1-1/2)
O.D 34.9(1-3/8)
I.D 28.58(1-1/8)
130(5-1/8)
I.D 22.2 O.D 28.58 I.D 34.9(1-3/8)
(7/8) (1-1/8)