Daikin VRV IV RKXYQ8T7Y1B, Installation And Operation Manual

Page: 9 / 44

4 Preparation
Installation and operation manual
9
8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
Compressor unit capacity type Refrigerant branch kit
5 HP KHRQ22M20T
8 HP KHRQ22M29T9
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch
kit model based on the total capacity index of all indoor units
connected after the refrigerant branch.
Example: Refnet joint c
(C→D/D).
Indoor unit capacity index Refrigerant branch kit
<200 KHRQ22M20T
200≤x<260 KHRQ22M29T9
Refnet headers
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index Refrigerant branch kit
<260 KHRQ22M29H
INFORMATION
Maximum 8 branches can be connected to a header.
4.2.5 Refrigerant piping length and height
difference
The piping lengths and height differences must comply with the
following requirements.
H1
H2
H3
H5
L1
a
L2
L3
L4
L5
L6
L7
H4
b
EKEXV
AHU
VRV DX
VRV DX
c
c
a Heat exchanger unit
b Compressor unit
c Refrigerant branch kit
VRV DX VRV DX indoor unit
EKEXV Expansion valve kit
AHU Air handling unit
H1~H5 Height differences
L1~L7 Piping lengths
Minimum and maximum piping lengths
1 Heat exchanger unit →
Compressor unit L1≤30 m
2 Actual piping length (equivalent
piping length)
(a)
L2+L3+L4≤70 m (90 m)
L2+L5+L6≤70 m (90 m)
L2+L5+L7≤70 m (90 m)
3 Total piping length (x=L1+L2+L3+L4+L5+L6+L7)
Minimum 10 m≤x
Maximum in case of
8 HP x≤300 m
Maximum in case of
5 HP If Then
L1≤30 m x≤115 m
L1≤25 m x≤120 m
L1≤20 m x≤125 m
L1≤15 m x≤130 m
L1≤10 m x≤135 m
L1≤5 m x≤140 m
4 EKEXV → AHU L4≤5 m
5 First branch kit → Indoor unit/
AHU L3+L4≤40 m
L5+L6≤40 m
L5+L7≤40 m
Maximum height differences
(b)
1 Heat exchanger unit ↔
Compressor unit H1≤10 m
2 Compressor unit ↔ Indoor unit H2≤30 m
H3≤30 m
3 EKEXV ↔ AHU H4≤5 m
4 Indoor unit ↔ Indoor unit H5≤15 m
(a) Assume equivalent piping length of refnet joint=0.5 m and
refnet header=1 m (for calculation purposes of equivalent
piping length, not for refrigerant charge calculations).
(b) Either unit can be the highest unit.
4.3 Preparing electrical wiring
4.3.1 About electrical compliance
Only for RKXYQ8
This equipment complies with:
▪ EN/IEC 61000‑3‑12 provided that the short-circuit power S
sc
is
greater than or equal to the minimum S
sc
value at the interface
point between the user's supply and the public system.
▪ EN/IEC 61000‑3‑12 = European/International Technical
Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input
current >16 A and ≤75 A per phase.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a short-circuit power S
sc
greater than or equal to the
minimum S
sc
value.
Model Minimum S
sc
value
RKXYQ8 3329 kVA
4.3.2 Safety device requirements
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
Power supply: Compressor unit
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model Minimum circuit
ampacity
Recommended
fuses
RKXYQ5 13.5 A 16 A
RKXYQ8 17.4 A 20 A
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380-415 V
Transmission wiring
Transmission line section: