GeneralAire DH70 Dehumidifier - Manual (Page 2)

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• In a whole house system, the DH70 should be located near the existing air handling system to minimize the
required ductwork for connecting of the DH70 system. When the remote control option is used, the control
(humidistat) unit must be located in the space that is to be conditioned. The control (humidistat) may be low
voltage (24 volt) and should be connected to the DH70 with code approved, low voltage thermostat cable.
• When a remote Humidistat is utilized, set the unit mounted humidistat to the “OFF” position.
• When locating the DH70 in areas of extreme heat or high humidity, >120-degrees/90% humidity, additional
external insulation may be required to prevent undesired condensation on the exterior of the unit.
Electrical Requirements
• The DH70 are equipped with an appliance cord with ground prong and may be plugged directly into a grounded
3 prong, 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.
• Do not remove ground prong. Do not use an adaptor. Do not use an extension cord.
• 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 DH70. The installer must supply the wiring between the DH70
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 DH70 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 DH70 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
optional 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 the drain line sweating that may cause damage.
Avoid double trapping. Where flexible tubing is used, or the possibilities of sags occurring in the drain line exist, or
the drain terminates in a sump below the waterline, the drain must be vented to allow proper draining. A condensate
drain vent must be installed at the outlet side of the drain trap, between the trap and the balance of drain line.
Ducting
(See Ducting Diagram)
A. Installing Duct
The DH70 is equipped with an 8”round duct collar inlet, and an 8” 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”.