If handing the unit, use two unistruts to support the base on
the outside edges of the feet locations. The strut must come
out a minimum of 20” in front of the filter access panel to
allow the panel and filter to be removed.
3
DRAIN LINE
The condensate drain of the humidifier must have a trap installed. Make sure
that a secure, leak-proof connection is made between the drain trap and drain elbow
on the dehumidifier. The condensate drain should be sloped to a floor drain or
condensate pump so water can not back up past trap.
If unit is installed in an attic or in an area where flooding is a potential problem
the unit should be installed in a secondary drain pan with a condensate overflow
safety switch.
HANGING
DUCTING
The Aprilaire Dehumidifier is supplied with two,
8” round collars. These are packaged 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.g.
of positive and 0.75” 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. See
Table 1 on page 11 for more detail.
• For optimal moisture removal, use a manual balancing damper
to adjust air flow to 275 CFM @ 0.6” w.c. across the
dehumidifier. Do not exceed 300 CFM or drop below 210 CFM.
• The total static pressure across the dehumidifier must not
exceed 0.8” w.c. Check all pressures with the HVAC
equipment blower 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.
