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The included condensate trap
must be installed to the Model
1700. Use PVC primer and
cement to connect the trap to the
drain outlet on the Model 1700.
The drain outlet is located near
the On/Off toggle switch. Note
orientation of trap prior to
cementing. The high side of the
trap mates with the Model 1700. The adjustable legs on
the Model 1700 must be disengaged approximately 1” to
accommodate the trap. Complete the assembly by piping
the trap to a drain. The trap must be primed with water
prior to start-up.
If the 1700 is installed in an attic or in an area where
flooding is a potential problem, it should be installed in a
secondary drain pan with a condensate overflow safety
switch. See page 12 for condensate overflow safety
switch wiring.
If hanging the unit, use two unistruts to support the base
on the outside edges of the feet locations. There must
be at least 20” of clearance in front of one of the filter
access doors to allow removal of the filter.
3
DRAIN LINE
HANGING
DUCTING
The Aprilaire Dehumidifier is supplied with two
8” round collars. These are packaged with a
condensate trap inside the unit behind the filter
access panel. When installing the collar make sure
the foam seal uniformly contacts the cabinet and
secure with 4 screws (not included). UL approved
8” diameter, insulated flexible duct is recommended
for all connections. Rigid metal duct may be used.
The duct should be capable of handling at least
2” w.c. of positive and 0.75” w.c. of negative
pressure. All joints and seams must be sealed.
Design air flow is 275 CFM @ 0.6” w.c. This is
equivalent to 70 ft. of 8” duct on the inlet and
outlet side of the dehumidifier. Elbows, turns and
the static pressure of the HVAC equipment will
affect the airflow through the dehumidifier.
• For optimal moisture removal, airflow should be at or above
275 CFM.
• The total static pressure across the dehumidifier must not
exceed 0.8” w.c. Check all pressures with the HVAC fan on.
• The outlet from the dehumidifier to the HVAC supply duct must be
located at least 6” downstream of the cooling coil.
• If connected to HVAC ductwork, the dehumidifier inlet must be located
at least 6” upstream of the HVAC system air cleaner. This will prevent
any trapped particulates from being drawn into the dehumidifier.
• If UV Germicidal lamps are installed in the HVAC system, use
appropriate methods to protect the flexible duct from the UV light.
• If air noise is a problem, install at least 5 feet of acoustical flexible
duct on the outlet and inlet of the dehumidifier.
2
1
/2”
1
/2”
Drain Outlet
Drain Trap
High Side
Low Side
FIGURE 1
90-961
3“ MIN
CLEARANCE FOR
ACCESS PANEL
20” MINUMUM
CLEARANCE FOR FILTER
(EITHER SIDE)
6" MIN CLEARANCE FOR FILTER
FILTER
TOP VIEW
FIGURE 2
90-970