Daikin VRV IV+ User Manual

18 | Piping installation
Installer and user reference guide
77
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Pipe Maximum length (actual/equivalent)
Longest pipe from the outdoor unit or
the last multi-outdoor piping branch
(1+2, 1+3, 1+5)
165m/190m
(a)
120m/165m
(b)
Longest pipe after the first branch (2, 3,
5)
40m/—
(c)
In case of a multi-outdoor setup:
longest pipe from the outdoor unit to
the last multi-outdoor piping branch (4)
10m/13m
Total pipe length 1000m/—
(a) If the equivalent piping length is more than 90m, size up the main liquid piping
according to "To select the piping size"[471].
(b) If the height difference between indoor units (=H2) is between 15 and 30m, then
the allowable maximum length of the longest pipe is limited to 120/165m (actual/
equivalent).
(c) An extension up to 90m is possible if all of the following conditions are met:
1 In case of BS1Q units, the piping length between all indoor units and the
nearest branch kit is ≤40m.
2 In case of multi BS units, the piping length between all indoor units and the
multi BS unit is ≤40m.
3 It is required to size up the liquid piping between the first branch kit and the
last. Beware that in contrast to multi BS units, BS1Q units are NOT considered
branch kits. If the increased pipe size is larger than the pipe size of the main
pipe, also increase the size of the main pipe.
4 After sizing up the liquid piping (previous condition), double its length in the
calculation of the total piping length. Make sure the total piping length is within
limitations.
5 The piping length difference between the nearest indoor unit to the outdoor
unit and the farthest indoor unit to the outdoor unit is ≤40m.
Connection with VRV DX indoor units and Hydrobox units
H3
1 2
H1
H2
3 5
4
a
b
b
c
d
e
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit

Daikin VRV IV+ Specifications

General

Type	VRV (Variable Refrigerant Volume)
Series	VRV IV+
Refrigerant	R-410A
Energy Efficiency	High
Inverter Technology	Yes
Operating Temperature Range (Cooling)	-5°C to 46°C
Cooling Capacity Range	22.4 kW - 168 kW
Indoor Unit Compatibility	Wide range
Maximum Piping Length	Up to 1000 m
Power Supply	380-415V, 50Hz, 3-phase
Maximum Height Difference	Up to 50 meters