13
Indoor Unit
Outdoor Unit
H
max. difference in height
≥
300mm
≥
300mm
Figure 7-4
CAUTION
7.4 Connecting method
Figure 7-5
CAUTION
The largest level difference between indoor unit and outdoor unit should not exceed 20m (if the outdoor unit is above)
or 15m (if the outdoor unit is below). Additionally: (i) If the outdoor unit is above and the level difference is greater than
20m, it is recommended that an oil return bend with dimensions as specified in Figure 7-4 is set every 5m in the gas
pipe of the main pipe; and (ii) if the outdoor unit is below and the level difference is more than 15m, the liquid pipe of
the main pipe should be increased one size.
1) Size of pipes of Gas side and Liquid side
MODEL
Refrigerant
Gas side/Liquid side
4/6kW
R32
Φ15.9/Φ6.35
8/10kW
R32
Φ15.9/Φ9.52
2) Connection method
Gas side
Liquid side
4~10kW
outdoor unit
Flaring
Flaring
Indoor unit
Flaring
Flaring
A
B
Check point of outdoor unit
Check point of indoor unit
D
C
The unit body
Affiliated heat pump belt
Site pipe side
Cut from upward