Daikin VRV W T-series - System Piping (Length) Limitation; Single Module and Standard Multi-Outside-Unit Combinations

4 Preparation
Installation manual
13
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
Indoor unit capacity
index
2 pipes 3 pipes
111≤x<230 KHRP26M72H9 KHRP25M72H9
≥230 KHRP26M73HU9 KHRP25M73HU9
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)
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)
Term Definition Distance
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.
4.3.5 Single module and standard multi-
outside-unit combinations
In case of heat pump mode
Connection with indoor units and air handling units
4
H1
H3
H2
a
a
b
b
2
5
1
3
a Outside unit
b VRV indoor unit
Pipe Maximum length (actual/
equivalent)
Longestpipefromtheoutside
unit or the last indoor unit (1+3,
1+2+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)
The actual piping length from
each indoor units to the nearest
refrigerant branch kit
130 ft (40 m)/—
(a) If the equivalent piping length is more than 295 ft (90 m),
size up the main liquid piping 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.