LG Multi V IV PRHR041 - OUTDOOR UNIT CONNECTIONS; REFRIGERANT PIPING INSTALLATION DETAILS; HR Unit Installation Procedure

12
ENGLISH
Type of HR Unit
Select an HR unit according to the number of the indoor units to be in-
stalled. HR units are classified into 3 types by the number of con-
nectable indoor units.
Ex) Installation of 6 indoor units
Consists of HR unit for 4 branches and HR unit for 2 branches.
Joint Method of HR Unit (Big Duct : ARNU76GB8-,
ARNU96GB8-)
Joint Method is required when B5/B8 chassis is installed. In Joint
Method, two neighboring outlets of one HR unit are linked by Y branch
pipe and connected to one indoor unit.
For more information, refer accessory installation manual.
2 Unit
3 Unit
4 Unit
ARCNB21
ARCNB31
ARCNB41
C
C
A
Outdoor units Model Low Pressure Gas Pipe Liquid Pipe High Pressure Gas Pipe
111
130
416
408
I.D.28.58 I.D.28.58
I.D.34.9
I.D.41.3 I.D.38.1
O.D.34.9
I.D.31.8
I.D.22.2
I.D.28.58
111
130
416
408
I.D.28.58 I.D.28.58
I.D.34.9
I.D.41.3 I.D.38.1
O.D.34.9
I.D.31.8
I.D.22.2
I.D.28.58
I.D.15.88 I.D.15.88
I.D.15.88
I.D.19.05
I.D.12.7
I.D.12.7
I.D.9.52
331
83
70
314
I.D.22.2
O.D.19.05
341
111
125
298
I.D.34.9
I.D.41.3
I.D.41.3
O.D.34.9
I.D.28.58
341
111
125
298
I.D.34.9
I.D.41.3
I.D.41.3
O.D.34.9
I.D.28.58
334
281
I.D.15.88
I.D.19.05
I.D.19.05
I.D.12.7
83
I.D.22.2
334
281
I.D.15.88
I.D.19.05
I.D.19.05
I.D.12.7
83
I.D.22.2
134
415
375
I.D.44.48 I.D.53.98
I.D.41.3
I.D.28.58
334
281
I.D.15.88
I.D.19.05
O.D.22.2I.D.25.4
I.D.19.05
I.D.12.7
83
80
I.D.22.2
C
C
C
C
Y branch
A
B
To outdoor unit
To branch piping or indoor unit
A
B
Facing
upwards
Facing
downwards
Within ± 3° Within ± 3°
Viewed from point A
in direction of arrow
Within +/- 10
Six-sided Nut
(M10 or M8)
Hanger metal
Hanger metal
Hanger metal
Flat washer
Flat washer
Flat washer
(M10)
Hanging bolt
Hanging bolt
Hanging bolt
(M10 or M8)
A
Insulation
Gas pipe
Gas pipe
Liquid pipe
Liquid pipe
HR Unit
1
2
3
4
Low pressure
Gas pipe
Liquid pipe
High pressure
Gas pipe
Whenever connecting the indoor units with the HR unit, install the in-
door units in numerical order from No.1.
Ex) In case of installing 3 indoor units : No. 1, 2, 3 (O), No. 1, 2, 4 (X),
No.1, 3, 4 (X), No.2, 3, 4 (X).
CAUTION
!
PRHR031(3 branches)PRHR021(2 branches)
1
2
1
3
2
PRHR041(4 branches)
1
2
3
4
1
st
HR Unit 2
nd
HR Unit
1 2 3 4
B8
(96k) (28k)
BG
1 2 3 4
B8
(76k)(21k)
BH
Installation of Outdoor Unit, HR Unit, Indoor Unit
Refrigerant Pipe
3 pipes are connected to the HR unit from the outdoor unit, classified
into liquid pipe, low pressure gas pipe and high pressure gas pipe de-
pending on status of refrigerant passing through the pipe.
You must connect 3 pipes from outdoor unit to HR unit.
For connection between indoor unit and HR unit, you must connect
both liquid pipe and gas pipe from the HR unit to the indoor unit. In this
case, connect them to the indoor unit starting from No.1 connection
port of the HR unit (the port number is displayed on ports of the HR
unit). Use auxiliary flare as annexed parts in connection to the indoor
unit.
Installation procedure for HR unit
1 Using an insert-hole-in- anchor, hang the hanging bolt.
2 Install a hexagon nut and a flat washer (locally-procured)to the hang-
ing bolt as shown in the figure in the bottom, and fit the main unit to
hang on the hanger metal.
3 After checking with a level that the unit is level, tighten the hexagon
nut.
* The tilt of the unit should be within ±5° in front/back and left/right.
4 This unit should be installed suspended from ceiling and side A
should always be
facing up.
5 Insulate not used pipes completely as shown in the figure.
Connection of Outdoor units
2, 3, 4 Outdoor Units