GeneralAire DH95 Dehumidifier - Manual (Page 2)

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Electrical Requirements
• The DH95 is equipped with an appliance cord and may be plugged directly into a 120 volt, 15 amp household type
convenience outlet. If used in a wet area such as an indoor pool, spa room, or an area prone to flooding (basement
or crawlspace), a ground fault interrupter protected circuit is required. In all cases local codes precede over all
installation and wiring recommendations.
• If a remote wall mounted Humidistat is utilized, install the Humidistat control in a central area of the structure where
it will sense the relative humidity of the structure accurately. Do not install the control where it may not accurately
sense the relative humidity: near HVAC supply registers, near exterior doors, or near a pool or spa. Do not install
the control in an area not served by the DH95. The installer must supply the wiring between the DH95 and the
Humidistat control. Be sure to safely route the control wiring to prevent damage during installation. Be careful not
to cross the wires when connecting the DH95 and the control or damage to the transformer may result.
• When a remote Humidistat is utilized, set the unit mounted humidistat to the “OFF” position.
• Consult the electrical schematic in this manual or inside the access panel of the DH95 before making the control
connections.
Condensate Removal
Condensate drains by gravity, via the ¾” PVC drain outlet located at two locations, front side and back side. Use
of both is not required. As shipped the rear drain is plugged, and may be removed and replaced into the front drain
outlet if the rear outlet is used. Also included with the unit is the condensate drain trap,
this trap must be used to
allow the unit to drain properly during operation and prevent air from being drawn from the area where the unit
is located. An optional condensate pump kit may be installed if a lift is required to dispose of the condensate. If an
option pump is used the condensate trap is still necessary and must be installed between the unit and pump.
When the condensate drain is located in, or passes through, a non-conditioned space,
the condensate piping should
be insulated to prevent sweating that may cause damage.
Ducting
(See Ducting Diagram)
A. Installing Duct
The DH95 is equipped with an 10”round duct collar inlet, and an 10” round exhaust/supply collar that provides for
connecting to the supply distribution system. In all cases sound duct design practices must be followed such as those
provided in ACCA manual “D”, or ASHRAE’s “Fundamentals of Air System design”.
B. Ducting for Dehumidification
For the ideal installation, draw air from the central part of the home and return it to the isolated areas of the home like
the bedrooms, den, utility room, or family room. The ductwork of the existing HVAC system can be used to supply
air to the home. If the existing supply duct adequately serves all areas of the home, discharge the supply air of the
DH95 into the return of the existing HVAC system where it can distributed throughout the space. The existing return
duct, if adequate, may be used as return for the DH95, DO NOT draw air directly from the kitchen, laundry, or isolated
basement. You may draw air from a basement that is open to the home. All flexible ducting connected to the DH95
should be approved by local codes and in most cases insulated.
• Return air ducts should be designed to allow unimpeded air flow to the return side of the system. For returns less
than 10’ in length, a 10” round or equal may be utilized. Multiple returns are acceptable.
• The supply air outlet and the return air inlet are located on each end of the DH95. A length of acoustical flex
ducting on the outlet of the DH95 will reduce air noise from the fan. A length of flexible ducting on all DH95 duct
connections is recommended to reduce noise and vibration transmitted to rigid ductwork in the structure.
• Ducting the DH95 as mentioned in the “Ducting” sections requires consideration of the following points:
• Duct Sizing: For total duct lengths up to 10’, use a minimum 10” diameter round or equivalent rectangular. For
longer lengths, up to 25’, use a minimum 12” diameter or equivalent duct size. Grills or diffusers utilized must
not excessively restrict airflow.
• Isolated Areas: Effective dehumidification may require that ducting be branched to isolated, stagnant areas.
Use 10” or larger diameter branch ducting to each of two or three areas, use 6” or larger to each of four or more
areas.