System Piping (Length) Limitation; Single Module And Standard Multi-Outside-Unit Combinations - Daikin VRV W T-Series Installation Manual

Indoor unit capacity 2 pipes
index
111≤x<230 KHRP26M72H9
≥230 KHRP26M73HU9
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 Heat pump mode
units
2 BHFP22T84U
3 BHFP22T126U
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
Actual piping length Pipe length between outside
units
Equivalent piping Pipe length between outside
length 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
Refnet joint
Refnet header
Single BSQ36-60T
Single BSQ96T
Multi BS4-6Q54T
Multi BS8-12Q54T
System piping (length) limitations
Term Definition
Actual piping length Pipe length between outside
and indoor units
Equivalent piping Pipe length between outside
length and indoor units
(b)
Total actual piping Total piping length from the
length outside to all indoor units
(a)
H1 Height difference between
outside and indoor units
RWEQ96~432TAYCU
VRV W T-Series water-cooled system air conditioner
4P540122-1B – 2018.11
3 pipes
KHRP25M72H9
KHRP25M73HU9
Heat recovery mode
BHFP26T84U
BHFP26T126U
Definition
and indoor
(a)
and indoor
(a)
Equivalent length
1.6 ft (0.5 m)
3.3 ft (1 m)
13 ft (4 m)
19 ft (6 m)
19 ft (6 m)
33 ft (10 m)
Distance
540 ft (165 m)
(a)
623 ft (190 m)
(a)
980 ft (300 m)
164 ft
(50 m)/130 ft
(40 m)
(b)
Term Definition
H2 Height difference between
indoor units
H3 Height difference between
outside units
(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
a
a
1
4 2
3
b
b
a Outside unit
b VRV indoor unit
Pipe
Longest pipe from the outside
unit or the last indoor unit (1+3,
1+2+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)
The actual piping length from
each indoor units to the nearest
refrigerant branch kit
(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.
4 Preparation
Distance
98 ft (30 m)
16 ft (5 m)
5
Maximum length (actual/
equivalent)
540 ft (165 m)/623 ft (190 m)
295 ft (90 m) /—
(b)
33 ft (10 m)/43 ft (13 m)
980 ft (300 m)/—
(c)
130 ft (40 m)/—
Installation manual
(a)
13