LG Multi V PRHR033 Installation Manual page 12

12
HR Unit
Liquid pipe
1 2
High pressure
Gas pipe
Low pressure
Gas pipe
Pipe
connection
from left side
CAUTION
!
Whenever connecting the indoor units with the HR unit, install the
indoor 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).
WARNING
!
Before brazing work, remove gas in the HR Unit by cutting the three
pipes in the small circles on the figure.
If not, it may cause injuries.
Remove the caps before connecting pipes.
Type of HR Unit
Select an HR unit according to the number of the indoor units to be
installed. HR units are classified into 5 types by the number of
connectable indoor units.
Ex) Installation of 6 indoor units
Consists of HR unit for 4 branches and HR unit for 2 branches.
2 1
PRHR023(A)(2 branches)
2 1
4 3
PRHR043(A)(4 branches)
PRHR083(A)(8 branches)
Gas pipe
Liquid pipe
3 4
Gas pipe
Liquid pipe
Pipe
connection
from right side
Parallel
pipe
connection
1
3 2
PRHR033(A)(3 branches)
2 1
4 3
6 5
PRHR063(A)(6 branches)
2 1
4 3
6 5
8 7
Joint Method of HR Unit (Big Duct : ARNU763B8-,
ARNU963B8-)
Joint Method is required when the big duct 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
4 3 2 1
BG B8
(38 k) (92 k)
High pressure gas pipe
Liquid pipe
Low pressure gas pipe
Remove caps on
The brazing part.
NOTE
!
• A connection to un-neighboring pipes is forbidden.
Do not link more than 2 outlets.
1 st HR Unit
4 3 2 1
B8
1 st HR Unit
4 3 2 1
B8
• The B8 unit, which has the largest capacity, must be connected
to the 1st and 2nd outlets of the 1st HR unit. Other B8 units can
be connected to any two neighboring outlets within one HR unit.
1 st HR Unit
4 3 2 1
B8 BG
(92k) (38k)
HR unit PRHR023(A)
Liquid pipe Ø 9.52 (3/8)
Low pressure
Ø 22.2 (7/8)
gas pipe
High pressure
Ø 19.05 (3/4)
gas pipe
nd
2 HR Unit
4 3 2 1
BH B8
(48 k) (72 k)
2 1
4 3
Gas pipe Ø 15.88(5/8) – Ø 12.7(1/2)
Liquid pipe Ø 9.52(3/8) – Ø 6.35(1/4)
Brazing Type
2 nd HR Unit
4 3 2 1
2 nd HR Unit
4 3 2 1
2 nd HR Unit
4 3 2 1
BH B8
(34k) (72k)
[Unit : mm(inch)]
PRHR043(A)
PRHR033(A) PRHR063(A)
PRHR083(A)
Ø 12.7 (1/2) Ø 15.88 (5/8)
Ø 28.58 (1-1/8) Ø 28.58 (1-1/8)
Ø 22.2 (7/8) Ø 22.2 (7/8)