Piping Requirements - Trane 18 Series Installer's Manual

Piping Requirements

If the outdoor unit is installed lower than the indoor unit:
1. A drain pipe should be above ground and the end of the pipe should not dip into water.
2. Taping pipes must be done from bottom to top. Do not wrap too tightly to avoid compression of
the insulation, otherwise its effectiveness is reduced.
3. All pipes are bound together by pipe tape and secured to the wall with saddles.
4. NOTE: Oil traps are sometimes needed when the outdoor unit is installed lower than the indoor
unit. One oil trap is required for each 33 ft. (10m) of vertical gas pipe length.
Outdoor Unit Installed Lower than
Indoor Unit
If the outdoor unit is installed higher than
the indoor unit:
1. Taping should be done from the lower to
the upper part. Do not wrap too tightly
to avoid compression of the insulation,
otherwise its effectiveness is reduced.
2. All pipes are bound and taped together and
also should be trapped to prevent water
from returning to the room.
3. Secure all pipes to the wall with saddles.
4. NOTE: Oil traps are sometimes needed
when the outdoor unit is installed higher
than the indoor unit. An oil trap is needed
for each 20 ft. (6m) of vertical rise on the
gas pipe.
88-M4MHW18-1C-EN
Outdoor Unit Installed Higher than
Indoor Unit
ODU
Drain
Pipe
Oil Trap
Insulated
Liquid
Pipe
Insulated
Gas Pipe
Oil Trap
Installer's Guide
Oil Trap
Drain
Pipe
IDU
23