Installation and Operation Manual -
WHDEHUM-90P
8
If the water does not properly drain and the float
switch closes, this will cause an error function to be
triggered by the dehumidifier, which will cause the
unit to permanently shut off. The error condition can
only be reset by switching the dehumidifier breaker
off, then back on or by unplugging power from the
dehumidifier.
Whole-House HVAC Configurations
An increasing number of systems are being
implemented with combination thermostat/
humidistats. In the same spirit of consolidated
control, there are also high integration thermostats
that include two different humidity control
capabilities. The first provides separate control
for a humidifier typically required during heating
season, and the second provides separate control
for a dehumidifier during the air conditioning
season. At the same time, control systems have
also become multi-speed controllers as required
to interoperate with high efficiency heat-pump and
forced air systems.
The Comfort-Aire/Century dehumidifier is equipped
with the basic required interconnection as
illustrated in Figure 4 below. However, this manual
does not provide interconnection diagrams for
the multitude of integrated thermostat/humidistats
A1 A2 A3 A4 A5 A6
NORMALLY OPEN FLOAT SWITCH
(PERMANENTLY CLOSES TO DISABLE
DEHUMIDIFIER)
G
*If the dehumidifier is installed in an attic or another location requiring
leak protection, the unit should be placed in a condensate pan with
a normally closed, condensate overflow safety switch (float switch).
Wire the float switch to terminals A5 and A6 as shown.
R
C
DH
DH
HVAC SYSTEM
TERMINALS
EXTERNAL
DEHUMIDISTAT
TERMINALS
Wiring shows connection of external humidistat to dehumidifier terminals.
Dehumidifier will start HVAC blower upon a call for dehumidification. When
te call is satisfied, the dehumidifier will act to turn off the HVAC blower
unless there is a call for cooling present. At that time, the HVAC
thermostat/air handler will be controlling the HVAC blower.
JUMPER
WIRE
DEHUMIDIFIER TERMINALS
Figure 4.
Wiring Diagram
* If the dehumidifier is installed in an attic or another location requiring leak protection, the unit should be placed in
a condensate pan with a normally open, condensate overflow safety switch (float switch). Wire the float switch to
Terminals A5 and A6 as shown.
currently available. The installation and control
should be performed by an expert HVAC technician
who will have the required knowledge to properly
prescribe and interconnect a specific combination
thermostat/humidistat.
Operation of the dehumidifier is supported with
both the unit control panel and optional humidistat
for whole-house configurations. In either case,
the dehumidifier configuration is set using the
dehumidifier control panel shown below.
Button Functions
1. Power Button ON/OFF
Use this button to turn the dehumidifier ON and
OFF. Press once to turn the machine ON. You
will hear a beep, and the power light will illuminate
Unit Controls
Figure 5.
Dehumidifier Control Panel
