Outdoor Unit Is Beneath The Indoor Unit; Outdoor Unit Is Above The Indoor Unit - Gree U-Match Series Owner's Manual

(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:

(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:
System gas pipe
Oil return bend
Outdoor unit
Outdoor unit
Install an oil return
bend every 6m
19
U-Match Series Duct Type Unit
Indoor unit
Install an oil return
bend every 6m
Non-return bend
System gas pipe
Oil return bend
Indoor unit