Allowable length and altitude difference of refrigerant pipe
Total Pipe Length(Actual)
Maximum
Piping(L)
Pipe Length(from the first line branch
pipe to furhtest indoor unit)(m)
Pipe Length(from the nearest branch
pipe equivalent length(m)
Indoor Unit-Outdoor
Unit Drop Height(H)
Indoor Unit to Indoor Unit Drop Heihgt(H)
Note: When the total equivalent piping length of liquid + gas side is ≥90m, it must increase the size of air side main pipe. Besides, according
to the distance of refrigerant pipe and the over matched state of inner unit, when the capacity is decreasing it still can increase the gas side
main pipe size.
The first cennect methond
Outdoor unit
L1
The First Line Branch Pipe
≤50m(8kW)
≤65m(10/12kW)
≤100m(14/16kW)
≤35m(8kW)
Actual Length
≤45m(10/12kW)
≤60m(14/16kW)
≤40m(8kW)
Equivalent Length
≤50m(10/12kW)
≤70m(14/16kW)
≤20m
≤15m
≤10m(8kW)
Outdoor Unit up
≤20m(10/12kW)
≤30m(14/16kW)
≤10m(8kW)
Outdoor Unit Down
≤20m(10/12kW)
≤20m(14/16kW)
≤8m
Pipe length(From the nearest branch pipe equivalent length)
A
L2
(From the first line branch pipe) Maximum pipe equivalent length
B
b
Pimitted value
L1+L2+L3+L4+L5+f(The first connect methond)
or L1+L3+L5+f(The second connect methond)
L2+L3+L4+L5+f(The first connect methond)
or L3+L5+f(The second connect methond)
a
Maximum pipe equivalent length
L3
L4
D
C
c
Indoor Unit
17
Piping
+a+b+c+d+e+f
L1+L2+L3+L4+L5
a,b,c,d,e
L5
E
d
e
f
table 4-11
Fig.4-7
V.1