Multiple Outdoor Units: Possible Layouts - Daikin VRV IV+ Installer And User Reference Manual

5.3.8 Multiple outdoor units: Possible layouts

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
6,7 VRV DX indoor units
Maximum allowable length
▪ Between outdoor unit and indoor unit.
Actual piping length
(a)
Equivalent length
Total piping length
(a) Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes).
▪ Between BP unit and indoor unit.
Indoor unit capacity index
<60
60
71
Remark: Minimum allowable length between outdoor unit and first refrigerant
branch kit>5 m (the refrigerant noise from the outdoor unit can be transmitted).
Example: a>5 m
Maximum allowable height difference
H1 ≤50 m (40 m) (if outdoor is located below indoor units)
H2 ≤15 m
H4 ≤40 m
H5 ≤15 m
H6 ≤5 m
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit ≤50 m.
Example: b+g+l≤50 m
If the piping length between the first branch and BP unit or VRV DX indoor unit is
over 20 m, it is necessary to increase the gas and liquid piping size between the
first branch and BP unit or VRV DX indoor unit. If the piping diameter of the sized
up piping exceeds the diameter of the piping before the first branch kit, than the
latter also requires a liquid piping and gas piping size up.
▪ The piping between the outdoor units must be routed level or slightly upward to
avoid the risk of oil retention into the piping.
100 m
Example:
a+b+g+l≤100 m
120 m
250 m
Example:
a+b+d+g+l+k+c+e+f+h+i+j≤250 m
5 Preparation
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Pipe length
2~15 m
2~12 m
2~8 m
Installer and user reference guide
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