Daikin VRV IV+ User Manual

18 | Piping installation
Installer and user reference guide
75
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
18.1.5 About the piping length
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 outdoor unit combinations
with VRV DX indoor units, Hydrobox units and/or air handling units (AHU).
Definitions
Term Definition
Actual piping length Pipe length between outdoor and
indoor units
Equivalent piping length Pipe length between outdoor and
indoor units, including the equivalent
length of the piping accessories
Total piping length Total piping length, from the outdoor to
all indoor units
Equivalent length of the piping accessories
Accessory Equivalent length
Refnet joint 0.5m
Refnet header 1m
Single BS1Q100~160 4m
Single BS1Q25 6m
Multi BS4~16Q14 4m
Allowable height difference
Term Definition Height difference (m)
H1 Height difference
between outdoor and
indoor units
50/40
(b)
H2 Height difference
between indoor units
15
30
(a)
H3 Height difference
between outdoor units
5
H4 Height difference
between EKEXV‑kits and
AHU units.
5
(a) If single outdoor units or standard multi-outdoor combinations >20HP are
connected to only VRV DX indoor units, then the height difference between indoor
units (=H2) can be increased from 15 to 30m. However, this limits the allowable
maximum length of the longest pipe (see "Connection with only VRV DX indoor
units"[476]).
(b) The allowable height difference is 50m in case the outdoor unit is positioned higher
than the indoor unit, and 40m in case the outdoor unit is positioned lower than the
indoor unit. If only VRV DX indoor units are used, the allowable height difference
between outdoor and indoor units may be extended to 90m, without the need of
an additional option kit. In this case, make sure all conditions below are met:

Daikin VRV IV+ Specifications

General

Brand	Daikin
Model	VRV IV+
Category	Heat Pump
Language	English