Haier MRV II AV08NMVERA Installation Manual page 19

Allowable refrigerant piping length and height difference
a. Allowable pipe length and height difference
Single way total pipe length
Single way max. pipe length
Main pipe between outdoor to 1
Pipe length between outdoors
Height difference between indoor and
outdoor
Height difference between outdoors(in the same system)
st
Max. pipe length from 1
Height difference between indoors
b. Pipe length between outdoors
outdoor1
Oil equalization pipe:
height difference between outdoors: h ＜ 5m
Note: a. HZG-30/A includes HZG-20/A;
b. The connection pipe among outdoors can not be higher than the stop valve position;
c. The connection pipe among outdoors should be horizontal or be in a certain angle as
the below figure (less than 15degree).
st
branch
Outdoor is upper
Outdoor is lower
branch pipe to indoor
Gas/liquid pipe: L1 ＜ 10m,
L5+L6 ＜ 10m
300m
Max. 150m
Max. 90m
Less than 10m to 1
Max. 50m
Max. 40m
Within 5m (better be horizontal)
Max. 40m
Max. 15m
outdoor2
L2+L3 ＜ 10m
19
st
branch pipe
outdoor 3
1st gather pipe
3
2st gather pipe