Daikin VRV IV Series - Page 70

16 | Piping installation
Installer and user reference guide
70
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
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.