13
ENGLISH
HR unit HR unit
sealing
Changeover under control Auto changeover Changeover under control
Zoning control group 1 Zoning control group 2
(Max. 8 Indoor Units)
(Max. 8 Indoor Units)
Installation of Zoning Control
Some indoor unit can be connected to one port of HR unit.
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
PRHR043A HR unit is 58 kW (192 kBtu/h).
• The maximum number of indoor units connected to a PRHR043A
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]
[Unit : mm(inch)]
Models
High pressure
-
Gas pipe
Low pressure
Liquid pipe
Indoor unit
reducer
HR unit
reducer
PRHR023(A)
OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 15.88(5/8) Ø 12.7(1/2)
Ø 6.35(1/4)OD 9.52(3/8)
Ø 6.35(1/4)OD 9.52(3/8)
OD 19.05(3/4) Ø 15.88(5/8)
OD 12.7(1/2) Ø 9.52(3/8)
Ø
12.7(1/2)
OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 15.88(5/8) Ø 12.7(1/2)
PRHR033(A)
PRHR043(A)
PRHR063(A)
PRHR083(A)
OD 19.05(3/4) Ø 15.88(5/8)
OD 28.58(1-1/8) Ø 22.2(7/8) Ø 19.05(3/4)
OD 15.88(5/8) Ø 12.7(1/2) Ø 9.52(3/8)
OD 12.7(1/2) Ø 9.52(3/8)
OD 15.88(5/8) Ø 12.7(1/2)
CAUTION
1 Use the following materials for refrigerant piping.
• Material: Seamless phosphorous deoxidized copper pipe
• Wall thickness : Comply with the relevant local and national
regulations for the designed pressure 3.8 MPa
(551.14 psi). We recommend the following table
as the minimum wall thickness.
Outer diameter
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-5/8)
44.45
(1-3/4)
53.98
(2-1/8)
Minimum thickness
[mm(inch)]
0.8
(1/32)
0.8
(1/32)
0.8
(1/32)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
1.1
(3/64)
1.21
(3/64)
1.35
(7/128)
1.43
(7/128)
1.55
(1/16)
2.1
(11/128)
2 Commercially available piping often contains dust and other
materials. Always blow it clean with a dry inert gas.
3 Use care to prevent dust, water or other contaminants from
entering the piping during installation.
4 Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5 Always use the branch piping set shown below, which are sold
separately.
Y branch
Header
4 branch 7 branch 10 branch
ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,
ARBLB23220
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
6 If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7 Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in
heating/cooling performance.
8 A second branch cannot be made after a header. (These are shown
by .)
9 The Multi V water will stop due to an abnormality like excessive or
insufficient refrigerant. At such a time, always properly charge the
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
10 Never perform a pump down. This will not only damage the
compressor but also deteriorate the performance.
11 Never use refrigerant to perform an air purge. Always evacuate
using a vacuum pump.
12 Always insulate the piping properly. Insufficient insulation will
result in a decline in heating/cooling performance, drip of
condensate and other such problems.
13 When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the
Outside and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
been completed.
14 Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or
damage to the compressor unit and flux can harm the copper
piping or refrigerant oil.
Ⓐ To Outdoor Unit
Ⓑ Sealed Piping
A
A
B
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