Multiple Module: Possible Layouts - Daikin VRV W T-Series Installation Manual

4 Preparation
In case of heat recovery mode
Connection with only indoor units
a
4
3
b b
a Outside unit
b VRV indoor unit
c Multi branch selector unit
d Single branch selector unit
The actual piping length from each indoor units to the nearest
refrigerant branch kit.
Multi branch selector box is to be considered as a branch, a single
branch selector box is not considered as a branch.
Pipe
Longest pipe from the outside
unit or the last multi-outside
piping branch (1+2, 1+3, 1+5)
Longest pipe after the first
branch (3, 2, 5)
In case of a multi-outside setup:
longest pipe from the outside
unit to the last multi-outside
piping branch (4)
Total pipe length (1+2+3+5)
(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) 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.
(d) Total pipe length can be extended to 1640 ft (500 m) when
total refrigerant amount is as follows:
Single system ≤ 77 lbs (35 kg)
Double system ≤ 145 lbs (66 kg)
Triple system ≤ 150 lbs (68 kg)
Installation manual
14
1 5
c
2
d
b
b
Maximum length (actual/
equivalent)
540 ft (165 m)/623 ft (190 m)
(a)
295 ft (90 m) /—
(b)
33 ft (10 m)/43 ft (13 m)
980 ft (300 m)/—
(c) (d)
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
b
a
b
a
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
≤6.5 ft (2 m)
6.5 ft (2 m)
or less
a
>6.5 ft (2 m)
6.5 ft (2 m)
or less
a
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 b c
A B
a To indoor units
b Outside unit multi connecting piping kit (first branch)
c Outside unit multi connecting piping kit (second branch)
VRV W T-Series water-cooled system air conditioner
Pattern 2
b
a
b
a
Then
b
Rising height:
8 inch (200 mm)
or more
b
C
RWEQ96~432TAYCU
4P540122-1B – 2018.11