Daikin VRV W T-series - Multiple Module: Possible Layouts

4 Preparation
Installation manual
14
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
In case of heat recovery mode
Connection with only indoor units
H3
1 5
H1
H2
3 2
4
a
b b
c
d
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 Maximum length (actual/
equivalent)
Longestpipefromtheoutside
unit or the last multi-outside
piping branch (1+2, 1+3, 1+5)
540 ft (165 m)/623 ft (190 m)
(a)
Longestpipeafterthefirst
branch (3, 2, 5)
295 ft (90 m)
(b)
/—
In case of a multi-outside setup:
longest pipe from the outside
unit to the last multi-outside
piping branch (4)
33 ft (10 m)/43 ft (13 m)
Total pipe length (1+2+3+5) 980 ft (300 m)/—
(c) (d)
(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)
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
>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 cb
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)