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4 Preparation
Installation manual
13
RWEQ96~432TAYD
∗
+ RWEQ96~432TATJ
∗
VRV W T-Series water-cooled system air conditioner
Outside unit
capacity type (MBH)
2 pipes
3 pipes
96
KHRP26A33T9
KHRP26A33TA
KHRP25A33T9
KHRP25A33TA
120~216
KHRP26M72TU9
KHRP26M72TUA
KHRP25M72TU9
KHRP25M72TUA
240~432
KHRP26M73TU9
KHRP26M73TUA
KHRP25M73TU9
KHRP25M73TUA
▪ For refnet joints other than the first branch (example refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Indoor unit capacity
index
2 pipes
3 pipes
<72
KHRP26A22T9
KHRP26A22TA
KHRP25A22T9
KHRP25A22TA
72≤x<111
KHRP26A33T9
KHRP26A33TA
KHRP25A33T9
KHRP25A33TA
111≤x<246
KHRP26M72TU9
KHRP26M72TUA
KHRP25M72TU9
KHRP25M72TUA
≥246
KHRP26M73TU9
KHRP26M73TUA
KHRP25M73TU9
KHRP25M73TUA
▪ Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity
index
2 pipes
3 pipes
<72
KHRP26M22H9
KHRP26M22HA
(Max. 4 branches)
or
KHRP26M33H9
KHRP26M33HA
(Max. 8 branches)
KHRP25M33H9
KHRP25M33HA
72≤x<111
KHRP26M33H9
KHRP26M33HA
111≤x<230
KHRP26M72H9
KHRP26M72HA
KHRP25M72H9
KHRP25M72HA
≥230
KHRP26M73HU9
KHRP26M73HUA
KHRP25M73HU9
KHRP25M73HUA
INFORMATION
If not stated otherwise, maximum 8 branches can be
connected to a header.
▪ How to choose an outside multi connection piping kit. Choose
from the following table in accordance with the number of outside
units.
Number of outside units Heat pump mode Heat recovery mode
2
BHFP22T84U
BHFP26T84U
3
BHFP22T126U
BHFP26T126U
INFORMATION
Reducers or T-joints are field supplied.
NOTE
Refrigerant branch kits can only be used with R410A.
4 .3 .4
System piping (length) limitation
Make sure the piping installation does not exceed the maximum
allowable pipe length, the allowable level difference, and the
allowable length after branching. To illustrate the piping length
requirements, 6 cases are discussed in the chapters below. They
describe both standard and non-standard outside unit combinations.
Definitions
Term
Definition
Actual piping length
Pipe length between outside
(a)
and indoor
units
Equivalent piping
length
Pipe length between outside
(a)
and indoor
units, including the equivalent length of the
piping accessories
Total piping length
Total piping length, from the outside to all
indoor units
(a) If the system is a multi outside installation, re-read "the first
outside unit branch as seen from the indoor unit".
Equivalent length of the piping accessories
Accessory
Equivalent length
Refnet joint
1.6 ft (0.5 m)
Refnet header
3.3 ft (1 m)
Single BSQ36-60T
∗
13 ft (4 m)
Single BSQ96T
∗
19 ft (6 m)
Multi BS4-6Q54T
∗
19 ft (6 m)
Multi BS8-12Q54T
∗
33 ft (10 m)
For the equivalent length of BSF-Q54T
∗
, refer to the table below based
on the total capacity of the indoor units to be connected downstream.
Also add 14 ft (4.3 m) to the below length when calculating an
equivalent length to each indoor unit connected to BSF-Q54T
∗
.
Total capacity of the
indoor units to be
connected downstream
Equivalent length
BSF4Q54T
∗
BSF6Q54T
∗
BSF8Q54T
∗
< 54
1 ft (0.4 m)
1 ft (0.4 m)
1 ft (0.4 m)
54 ≤ × < 72
1 ft (0.4 m)
1 ft (0.4 m)
1 ft (0.4 m)
72 ≤ × < 111
2 ft (0.7 m)
2 ft (0.7 m)
2 ft (0.7 m)
111 ≤ × < 162
5 ft (1.6 m)
7 ft (2.2 m)
7 ft (2.2 m)
162 ≤ × < 230
7 ft (2.2 m) 11 ft (3.4 m) 11 ft (3.4 m)
230 ≤ × ≤ 290
14 ft (4.3 m) 19 ft (5.8 m) 19 ft (5.8 m)
System piping (length) limitations
Term
Definition
Distance
Actual piping length Pipe length between outside
(a)
and indoor units
540 ft (165 m)
Equivalent piping
length
(b)
Pipe length between outside
(a)
and indoor units
623 ft (190 m)
Total actual piping
length
Total piping length from the
outside
(a)
to all indoor units
980 ft (300 m)
H1
Height difference between
outside and indoor units
164 ft (50 m)/
130 ft (40 m)
(b)
H2
Height difference between
indoor units
98 ft (30 m)
H3
Height difference between
outside units
16 ft (5 m)
(a) In the case of an outside units multi system, "outside unit"
should be read as the "first outside unit multi connection
piping kit", seen from the indoor units side.
(b) The allowable height difference is 164 ft (50 m) in case the
outside unit is positioned higher than the indoor unit, and
130 ft (40 m) in case the outside unit is positioned lower
than the indoor unit.
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