DC Inverter U-Match Series Cassette Type Unit
21
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:
Install an oil return
bend every 6m
Oil return bend
System gas pipe
Outdoor unit
Indoor unit
(2) Outdoor unit is above the indoor unit.
It’s necessary to add oil return bend and non-return bend at the lowest and
highest position of the vertical pipe, as shown below:
Outdoor unit
Non-return bend
System gas pipe
Oil return bend
Indoor unit
Install an oil return
bend every 6m
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