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Piping installation
Installer and user reference guide
70
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
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.
