Westpoint 12K - Page 31

DC Inverter U-match Series Cassette Type Unit
20
Item
Model
Size of Fitting
Pipe(inch)
Maximum
pipe length
(m)
Biggest drop
between
indoor and
outdoor units
(m)
Liquid
pipe
Gas pipe
12K
Ф1/4
Φ3/8
30
15
18K
Φ1/2
30
20
18K
30
20
24K
Φ3/8 Φ5/8
30
20
30K
30
25
36K
75
30
42K
75
30
48K
75
30
60K
75
30
Connection pipe should adopt water-proof insulating material. Its wall thickness
should be 0.5-1.0mm and the pipe wall should be able to withstand 6.0MPa. The
longer the connection pipe is, the worse cooling and heating performance it has.
When the drop between indoor and outdoor units is larger than 10m, an oil
return bend should be added every 6m.
The requirement on the adding of oil return bend is as below:
(1) Outdoor unit is beneath the indoor unit.
There’s no need to add non-return bend at the lowest or highest position of the
vertical pipe, as shown below: