Installation and Operation Manual -
WHDEHUM-90P
6
pump configuration. This will require expert
installation.
4.
Support the PVC tubing so that it maintains a
smooth downward flow to drain.
5.
Always test the drain before leaving the
installation area.
Step 3: Electrical Power Connections
The dehumidifier is equipped with a 3-prong,
standard 120VAC electrical plug. Given operation
in damp and wet environments, and to put safety
first, the required electrical outlet to be used to
connect the dehumidifiers should have:
1.
Ground Fault Circuit Interrupter (GFCI)
2.
15 Amp minimum circuit that cannot be shared
with any other significant load
120VAC may cause serious injury from electric
shock. To ensure safety:
1.
Disconnect electrical power before servicing.
2.
Only plug unit into grounded electrical circuit.
3.
Do not use extension cord.
4.
Do not use a plug adapter.
Step 4: General Ducting Points and
Requirements
In all cases, sound duct design practices must be
followed, such as those provided in ACCA manual
“D” of ASHRAE’s
Fundamentals of Air System
Design
.
For supply side air ducting (output from the
dehumidifier), the WHDEHUM-90P has a 6” round
duct.
For return side ducting, the dehumidifier is
equipped as follows:
•
A 12” round collar.
For ducting material to use between existing ducts
or new ducts with the dehumidifier, it is advisable
to select an acoustical flex duct material on all
dehumidifier duct connections to reduce noise
and vibration transmitted to rigid ductwork in the
structure. At the same time, flex ducting is very
easy to use and eliminates the need for very
detailed measurement, cutting, and duct forming.
Ducting for Standalone Unit Configuration
For Standalone Unit Dehumidification, there is not
a connection to existing HVAC ductwork. In the
SUD case, when installing the dehumidifier inside a
sealed crawlspace, a basement, or a sealed attic,
the ducting requirements are recommended as
follows:
1.
If the area is open without partitions and the
dehumidifier can be located near the center
of the zone, then the return ducting is not
absolutely necessary. Still, a minimum length
of supply duct of just 3’ to 6’ will aid in overall
air distribution. The short supply duct distance
will support carrying the dehumidified air far
enough away from the unit that it will not be
quickly reprocessed again as returned air.
2.
If the area being served is divided by walls or
partitions, then the return duct should be routed
to a second area/zone than the area where the
dehumidifier is placed - and the supply duct
should be routed to even a third area. These
different areas will help push the air between
the walls and/or partitions.
3.
A similar but reverse strategy as #1 above, if
the dehumidifier needs to be located along the
perimeter in a more open zone, then a single
return to the dehumidifier should be installed
in the central open area of the structure to aid
overall air distribution.
Ducting for Whole-House Separate Room
Figure 1 on page 4 depicts an example system
configuration that is in a residential living
environment but is not interconnected with an
existing HVAC system. The dehumidifier unit
is separated given the living area is not in close
proximity with the HVAC system, or the existing
HVAC system could be a mini-split without any
ductwork to connect with. In either case, the
dehumidifier is to be installed with its own separate
ducting, including both return and supply side.
Return Ducting for Whole-House Separate Room
The return duct length is not overly critical, and
it is acceptable to provide more than a single
WARNING
In all cases, local codes precede over
installation and wiring recommendations. Do
not plug the dehumidifiers into the outlet until all
the control circuitry is properly connected.
