Carrier 38GJ Owner's Manual & Installation Instructions page 12

4.2.3 Oil Trap Design Requirements
If the height differencebetween the indoor unit and the outdoor unit exceeds 19.7ft(6m), install an oil trap every 19.7ft(6m) from
the lower to the upper section of the vertical gas pipe. The oil trap shall be fabricated into two U-type
elbows or one return-type elbow. The height shall be 3~5 times the piping diameter.
See below for details on the installation and fabrication of the oil trap.
_. The oil trap may be fabricated into a U-type or return-type.
If the outdoor unit is below the indoor unit, it is not needed to install an oil trap on the vertical pipe for gas piping.
@. If the outdoor unit is below the indoor unit, it is not needed to install an oil trap at the highest or lowest
position. If the outdoor unit is above the indoor unit, the oil trap and stop elbow must be installed at the lowest and
the highest position of the vertical pipe. Refer to the schematics below.
_. The fabrication dimensions of the oil trap are shown below.
¢3/4i n (19.05m
@. Refer to the schematics below.
• The outdoor unit is lower than the indoor unit.
Stopelbow
Gas pipe
Liquid pipe
Oil trap
Outdoor
unit
/
12
19.7ft (6m)
19.7ft (6m)
19.7ft (6m)
19.7ft (6m)
19.7ft (6m)
Indoor
unit