Concealed Duct Installation Manual

DURASTAR.COM18
4. This unit is equipped with a drain pump that allows the outlet of the drain pipe to be higher
than the pipe's connecting port. For pump assisted draining, install the drain pipe to the upper
connecting port. The vertical lift pipe must be installed no higher than 21 5/8" (550mm) from
the drain connection port with a maximum distance of 7 7/8" (200mm) between the unit and
the lift pipe. To prevent air bubbles, make sure the pipe between the unit and the lift pipe is
level or slightly tilted up (0 - 1"). Install hanging wires every 39 - 59" to keep the drain pipe
from sagging, and wrap the indoor portion of the pipe with foam pipe insulation to prevent
condensation. Incorrect installation can cause water to flow back into the unit and leaks.
1/100
Ceiling
<7 7/8”
(200mm)
39-59”
(990mm-
1500mm
<21 5/8”
(550mm)
Using pump
Not using pump
<21 5/8”
(550mm)
≥4”
(101mm)
Slope
1/100
Slope
1/100
5. If connecting multiple drain pipes, install the pipes as illustrated below.
6. Pass the drain pipe through the wall hole to the outside. The end of the pipe should be at least
2" (50mm) above the ground. If it touches the ground, the pipe may become blocked. Make
sure the water drains to a safe location where it will not cause water damage or a slipping
hazard.