4 Preparation
Installation manual
15
RWEQ96~432TAYD
∗
+ RWEQ96~432TATJ
∗
VRV W T-Series water-cooled system air conditioner
(a) If the equivalent piping length is more than 295 ft (90 m),
size up the main liquid pipings according to "4.3.2 To select
the piping size" on page 11.
(b) If actual piping length of indoor units where difference from
the indoor unit nearest to the outside unit is more than 130 ft
(40 m), please size up according to "4.3.7 Piping length
requirements" on page 15.
(c) For Branch Selector unit connected in pass through
installation, all three conditions below must be satisfied.
1. Maximum capacity index of connectable indoor units for
BSF6, 8Q54T
∗
is ≤162 per Branch Selector unit.
2. Maximum capacity index of connectable indoor units under
Branch Selector units connected in pass through is ≤230.
3. Total number of ports of Branch Selector units connected
in pass through is ≤12.
(d) 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.
(e) Total pipe length can be extended to 1640 ft (500 m) when
total refrigerant amount is as follows:
Single system ≤ 77 lb (35 kg)
Double system ≤ 145 lb (66 kg)
Triple system ≤ 150 lb (68 kg)
4 .3 .6
Multiple module: Possible layouts
▪ The piping between the outside units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1
a
b
Pattern 2
a
b
a
b
a
b
a
To indoor unit
b
Piping between outside units
X
Not allowed (oil remains in piping)
O
Allowed
▪ If the piping length between the outside unit connecting pipe kit or
between the outside units exceeds 6.5 ft (2 m), create a rise of
8 inch (200 mm) or more in the suction gas and high/low pressure
gas line within a length of 6.5 ft (2 m) from the kit.
▪ For the gas piping (both discharge and suction gas piping in case
of the heat recovery system) after the branch, install a trap of
8 inch (200 mm) or more using the piping included in the piping kit
for connecting the outside unit. Otherwise, the refrigerant may
stay in the piping, causing damage to the outside unit.
≥8 inch (200mm)
If
Then
≤6.5 ft (2 m)
6.5 ft (2 m)
or less
a
b
If
Then
>6.5 ft (2 m)
6.5 ft (2 m)
or less
Rising height:
8 inch (200 mm)
or more
a
b
a
To indoor unit
b
Piping between outside units
NOTE
There are restrictions on the refrigerant pipe connection
order between outside units during installation in case of a
multiple module system. Install according to following
restrictions. The capacities of outside units A, B and C
must fulfill the following restriction conditions: A≥B≥C.
a
c
b
A
B
C
a
To indoor units
b
Outside unit multi connecting piping kit (first branch)
c
Outside unit multi connecting piping kit (second branch)
4 .3 .7
Piping length requirements
In case of heat pump mode
10
12
13
11
17
16
9
8
7
1
Y
14
15
6
b
a
a
b
c
*b
*b
b
b
b
First branch
Farthest
branch
If actual piping length of indoor units 48 types, 54 types, and 72
types, 96 type where difference from the indoor unit (Y) nearest to
the outside unit is more than 130 ft (40 m),
Example:
b is neither 48 types nor 54 types nor 72 types nor 96 type
*b is 48 types or 54 types or 72 types or 96 type
(6+11)–(6+10)<130 ft (40 m)
(7+12+17)–(6+10)<130 ft (40 m)
(7+13+17)–(6+10)<130 ft (40 m)
(7+8+14)–(6+10)>130 ft (40 m)
(7+8+9+15)–(6+10)>130 ft (40 m)
(7+8+9+16)–(6+10)>130 ft (40 m)
please size up both liquid pipe and gas pipe until the closest branch.
(14, 16)
01_EN_4P602454-1C.indd 15
2020/07/29 16:16:41
