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Condensate Drain Connection
Note:
•
All condensate drain connections must be properly trapped
and primed before operating the unit. Failure to properly
trap a drain will result in flooding the drain pan and
potential water damage to the unit or building.
Unit has a factory mounted condensate pump that runs
continuously while the unit is in cooling mode. The pump
has an internal high level float switch that stops the unit
if the water level in the pan rises too high.
Unit includes a factory-provided flexible drain hose kit
with one or two clamps to connect the unit to the drain
piping system. The hose can be used to connect the
condensate pipe to the condensate pump connection.
There is the option to direct connect a 1 NPT fitting to
the drain pa
n’s gravity drain connection.
Note:
•
not to exert lateral force on the drain nipple. Internal
damage may occur. Refer to Table 19 for condensate pipe
connection size
Condensate Pump Connection
•
Unit has a condensate pump. Note the following
when connecting the condensate pipe to the unit
(Figure 19).
•
Units DO NOT come with check valves or a backflow
prevention device. If check valves are needed, they
must be field supplied.
•
The maximum lift of all condensate pumps is 27
in.wg.
•
Measure lift distance from the bottom surface of the
unit, NOT from the condensate pipe connection.
•
Slope all horizontal condensate pipe segments a
minimum of 1/4 inch per foot away from the indoor
unit.
Figure.19: Built in Drain Duct to Drain Piping System
Unit Drain Information
When the bottom surface of the unit is at an elevation
below the receiving building drain line connection, install
an inverted trap at the top of the condensate pump
discharge riser before connection to the building drain
pipe.
When the receiving drain line is mounted horizontal,
connect the inverted trap to the top half of the pipe. The
connection point of the inverted trap to the building drain
pipe must always be to the top half of the pipe and must
never be over 45° either side of the upper most point of
the horizontal building drain line.
If connecting to a vertical drain line or plumbing system
vent line, connect the IDU condensate pump discharge
line using a Y-45 fitting with the double end of the Y-45
fitting facing up. When connecting to a vertical drain line
include an inverted trap at the top of the IDU condensate
pump discharge riser before connection to the Y-45
fitting
Gravity Condensate Pipe Connection
Unit has an auxiliary gravity condensate drain
connection opposite side of condensate pump pipe
connection the unit. This connection may be used
instead of using the condensate pump. If the gravity
drain is used, disconnect the DOAS condensate pump
connector on the Controller.
• Verify the unit is installed with a slight cant toward
the gravity drain connection.
• Remove the rubber plug before connecting the
condensate line to the indoor unit.
• The gravity condensate line must be equipped with a
condensate trap for proper condensate flow. Refer to
Figure 20 for trap details.
• All horizontal segments of condensate pipe should
be sloped a minimum of 1/4 inch per foot away from
the indoor unit.
Figure.20: Gravity Condensate Trap
39.6~58.8 in.
When making condensate pip connections, be careful
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