25
Refrigerant piping
Second connection method
1
2
3
5
4
L
1
L
2
N
1
N
2
N
3
N
5
N
6
N
4
L
3
L
4
L
5
a
A
B
D
E
C
b
c
e
f
d
Fig. 33
Ref. Pipe length Value
1
Maximum dierence in height
between outdoor units (located at
the top) and indoor units
30m
Maximum dierence in height
between outdoor units (located at
the bottom) and indoor units
20m
2
Pipes between the furthest indoor
unit and the first indoor branch
20m
3
Maximum equivalent length of the
pipe between the outdoor unit
and the furthest indoor unit
50m/70m (*)
4
Maximum dierence in height
between indoor units
8m
5
Equivalent pipe length from the
first branch to the nearest indoor
unit
15m
(*) 50 m (8-10.5 kW) - 70 m (12-14 + 16-18 kW)
Ref. Description
L Main pipe
L .... L Internal main pipes
a .... f Internal auxiliary pipes
A .... E Internal branch joints
N .... N
Indoor units
(the power in kW in brackets)
Outdoor unit
first joint
Indoor unit