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.
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.
ODU
IDU
Drain
Pipe
Oil Trap
Liquid
Pipe
Gas Pipe
Oil Trap
Oil Trap
Drain
Pipe
Outdoor Unit Installed Lower than
Indoor Unit
Outdoor Unit Installed Higher than
Indoor Unit
88-M4MHW17-1A-EN 23
Installer's Guide
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