Type Of Hr Unit; Installation Of Zoning Control - LG MULTI V S ARUB060GSS4 Installation Manual

12

Type of HR Unit

Select an HR unit according to the number of the indoor units to be
installed. HR units are classified into 3 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
PRHR022(A)(2 branches)
PRHR042(A)(4 branches)
Joint Method of HR Unit (Big Duct : ARNU763B8-, ARNU963B8-)
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
(96 k) (28 k)
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
Remove caps on
The brazing part.
Gas pipe Ø 15.88 (5/8)
Liquid pipe Ø 9.52 (3/8)
Brazing Type
HR unit PRHR022(A)
Low pressure
Ø 22.2 (7/8)
gas pipe
High pressure
Ø 19.05 (3/4)
gas pipe
Liquid pipe Ø 9.52 (3/8)
3
2
1
PRHR032(A)(3 branches)
4
3
1 2
nd
2 HR Unit
1 2 3 4
BH B8
(21 k) (76 k)
3 4
1 2
PRHR032(A) PRHR042(A)
Ø 28.58 (1-1/8) Ø 28.58 (1-1/8)
Ø 22.2 (7/8) Ø 22.2 (7/8)
Ø 12.7 (1/2) Ø 15.88 (5/8)

Installation of Zoning Control

Some indoor unit can be connected to one port of HR unit.
HR unit
sealing
Zoning control group 1
(Max. 8 Indoor Units)
Changeover under control Auto changeover
WARNING
!
• A branch pipe of HR unit allows up to 14.5 kW (48 kBtu/h) based
on cooling capacity of the indoor unit. (up to 14.5 kW (48 kBtu/h)
for max installation)
• The maximum total capacity of indoor units connected to a
PRHR042(A) HR unit is 58 kW (192 kBtu/h).
• The maximum number of indoor units connected to a
PRHR042(A) HR unit are 32 indoor units. (The Maximum indoor
units per a branch pipe of HR unit are 8 indoor units)
• There is not operate "Auto-changeover" & "Mode override"
function in the zoning group.
• When there are operating indoor units on cooling(heating) mode,
another indoor units aren't changed on heating(cooling) mode in
the zoning group.
[Reducers for indoor unit and HR unit]
Models
Liquid pipe
Indoor unit
reducer
O.D 9.52 (3/8)
Ø 6.35 (1/4)
O.D 19.05 (3/4)
PRHR022(A)
O.D 9.52 (3/8)
Ø 6.35 (1/4)
HR unit
reducer
O.D 22.2 (7/8)
PRHR032A/
PRHR042A
O.D 15.88 (5/8) Ø 9.52 (3/8)
Ø 12.7 (1/2)
HR unit
Zoning control group 2
(Max. 8 Indoor Units)
Changeover under control
Unit : mm(inch)
Gas pipe
High pressure Low pressure
-
O.D 15.88 (5/8)
Ø 12.7 (1/2)
O.D 22.2 (7/8) Ø 15.88 (5/8)
Ø 12.7 (1/2)
Ø 19.05 (3/4)
15.88 (5/8)
O.D 15.88 (5/8)
O.D 12.7 (1/2) Ø 9.52 (3/8)
Ø 12.7 (1/2)
O.D 28.58 (1-1/8) Ø 19.05 (3/4)
Ø 15.88 (5/8)
Ø 22.2 (7/8)
Ø 19.05 (3/4)
O.D 15.88 (5/8)
O.D 19.05 (3/4)
Ø 12.7 (1/2)
Ø 15.88 (5/8)