Installing the Refrigerant Pipe Work
Item Example Remarks
Maximum
allowable
length of pipe
Outdoor unit ~
Indoor units
Longest
piping length
Less than
70m
a+b+c+d+e ≤ 70m
Equivalent
length
Less than
85m
Y-joint and EEV kit : 0.5m
Total length
Less than
200m
a+b+c+d+e+f+g+h+i ≤ 200m
10m≤Total length
≤200m
Maximum
allowable
height
Outdoor unit ~
Indoor units
Less than 30m H1
If outdoor unit is
located lower
position H1 ≤ 25m
Indoor unit ~
Indoor unit
Height
difference
between
indoor units
Less than
15m
H2
Maximum
allowable
length of pipe
First Y-joint ~
Last indoor unit
Actual piping
length
Less than
40m
b+c+d+e ≤ 40m (between first Y-joint and indoor unit)
h≤20m(between EEV kit and indoor unit)
Additional refrigerant
calculation
R=Basic charge + additional charge by the piping length
Basic charge : Up to 10m when installing A2W only = 3300g
When installing A2W and A2A together, add basic additional refrigerant (700g)=4000g
Contact the manufacturer if the length should exceed.
Outdoor unit
Using EEV kit
Using only Y-joint
Outdoor unit
RD110/140/160PHXEA
EEV
kit
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