Connection Of Outdoor Units; Installation Procedure For Hr Unit; Installation Of Outdoor Unit, Hr Unit, Indoor Unit Refrigerant Pipe; Type Of Hr Unit - LG Multi V IV PRHR041 Installation Manual

12

Connection of Outdoor units

2, 3, 4 Outdoor Units
Outdoor units Model Low Pressure Gas Pipe
I.D.28.58
C ARCNB21
2 Unit C
I.D.31.8 I.D.34.9
I.D.41.3 I.D.38.1 O.D.34.9
130
C
C
3 Unit ARCNB31 I.D.41.3
I.D.41.3 O.D.34.9
C
ARCNB41
4 Unit A
I.D.44.48 I.D.53.98
C
For more information, refer accessory installation manual.
Y branch
A
To outdoor unit
A
B To branch piping or indoor unit
Facing Facing
downwards upwards
Within ± 3° Within ± 3°

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.
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)
Liquid Pipe High Pressure Gas Pipe
331
416 334
408 314 281
I.D.28.58 I.D.15.88 I.D.15.88
111 I.D.12.7 I.D.9.52 83
I.D.22.2 I.D.19.05
I.D.22.2 I.D.19.05
I.D.22.2 O.D.19.05
I.D.28.58 I.D.12.7 I.D.15.88
70
341
334 416
298
281 408
I.D.28.58
I.D.34.9
111 83
I.D.19.05
I.D.22.2 I.D.19.05 I.D.31.8 I.D.34.9
I.D.41.3 I.D.38.1 O.D.34.9
I.D.28.58 I.D.15.88 I.D.12.7
125
130
415 334 341
375 298
281
83
I.D.19.05
134 I.D.22.2 I.D.19.05
I.D.41.3 I.D.41.3
I.D.25.4 O.D.22.2
I.D.41.3 O.D.34.9
I.D.15.88 I.D.12.7
I.D.28.58
80
125
Within +/- 10
B
Viewed from point A
in direction of arrow
A
Insulation
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
I.D.19.05 83
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
I.D.15.88 I.D.12.7
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.
I.D.28.58
111
I.D.22.2
I.D.28.58
Low pressure
Gas pipe
I.D.34.9
111
I.D.28.58
Liquid pipe
CAUTION
!
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).

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.
PRHR021(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.
st
1 HR Unit
1 2 3 4
B8 BG
(96k) (28k)
Gas pipe
HR Unit
Liquid pipe
3 4
1 2
Gas pipe
High pressure
Gas pipe
Liquid pipe
2
1
PRHR031(3 branches)
3 4
1 2
PRHR041(4 branches)
nd
2 HR Unit
1
BH
(21k)
3
2
1
2 3 4
B8
(76k)