Installation and Operation Manual -
WHDEHUM-90P
5
splashed and that it is wired into a GROUND
FAULT INTERRUPTER protected circuit.
5.
A secondary drain pan MUST be placed under
the unit if installed above a living area or above
an area where water leakage could cause dam-
age (see local codes for other requirements)
6.
DO NOT position the dehumidifier directly on
structural members where noise or vibration
may be objectionable. The unit is equipped with
adjustable support feet to raise and level the
unit from the mounting surface; these adjust-
able feet should be utilized to provide improved
drainage from the drain pan and should be
adjusted to tilt slightly toward the drain utilized.
7. The unit should be located near the existing
air handling system to minimize the required
ductwork for connection of the dehumidifier to
the existing HVAC air handling system. When
the option is used, the control (humidistat) unit
must be located in the space that is to be con-
ditioned. The control (humidistat)
must
be low
voltage (24V) and should be connected to the
unit with code approved, low voltage thermostat
cable.
8.
When locating the dehumidifier in areas of ex-
treme heat or high humidity, >120-degrees/90%
humidity, additional external insulation may be
required to prevent undesired condensation on
the exterior of the unit.
Common Installation Instructions Across All
Configurations
Step 1: Placement of the Dehumidifier Unit
IMPORTANT: If the dehumidifier unit is handled in
such a manner that the compressor did not remain
in the upright position, it is necessary to place on
a level surface and wait a minimum of two hours
before turning the unit on.
Additionally, the Comfort-Aire/Century dehumidifier
cannot sit directly on the floor unless the unit
condensate drain output is feeding directly into a
sump pump next to it.
When placing, the dehumidifier unit is equipped
with adjustable feet that can be used along with a
leveling tool to make sure the dehumidifier rests in
a completely “level” final state as needed for proper
operation.
Step 2: Set Up Drain Line
The condensate drain line should be routed to a
suitable drain to carry the condensate water to the
outside. The drain line must flow down without any
loops, dips, or valleys to the final drain hole.
Recommended Dehumidifier Drain Config-
uration Including a Transition to PVC Pipe
1.
Cut a piece of ¾” OD PVC that is 6” minimum.
2.
Insert PVC into a ¾” elbow, then attach a ¾”
OD length of PVC to drain. Keep the length
of the PVC drain pipe to a minimum and make
sure it flows down.
3.
Insert the open end of the dehumidifier
condensate tubing into the ¾” pipe so that
it does not extend into the elbow fitting. For
proper flow, a minimum downward slope of
1” per 10’ run is required. NOTE: If a proper
downward angle is not possible, then it is
recommended to use an external condensate
Installation
WARNING
Standalone Unit Dehumidification configu-
rations, as noted, are typically used to dry
basements and crawlspaces. To be properly
dehumidified, the area to be controlled should
be sealed with a vapor barrier. If the unit is to
be installed in a crawlspace, all vents to the
outdoors should be sealed. Do not install your
humidifier in a corrosive environment. Some
liquid barriers dry via “solvent evaporation”.
Always ensure the barrier is completely dry and
area is thoroughly ventilated before installing
dehumidifier.
Figure 3.
Drain Tube Drawing
