Install Instructions

MODEL 76 – EXTERNAL CONTROL OR CRAWL SPACE/SEALED ATTIC CONTROL AND WIRING
NOTE: Use 18-22 AWG wire for control wiring�
EXTERNAL CONTROL
Used as an external control, the Model 76 is mounted
in the space that is to be dehumidified� When
the dehumidifier is powered, the display on the
dehumidifier control will show EXTERNAL to indicate
that an external control is being used� External controls
are recommended when the dehumidifier is installed in
an attic and is ducted to the HVAC system�
The Model 76 uses a normally open (NO), dry contact
(i�e� not a triac or other semiconductor) relay to
complete the circuit between the DH terminals of the
dehumidifier control� If using other controls such as
a thermostat with dehumidification outputs, ensure
the output is a dry contact type and set the NO/NC
switch on the dehumidifier control (see FIGURE 22) to
correspond with the control being used� The Aprilaire
Model 8620 Thermostat or Model 8910 Home Comfort
Control are recommended alternate controls and both
use normally open contacts�
If an external control is used in a zoned application, it
must be located in the Primary Zone (refer to the TWO
ZONE – PRIMARY AND SECONDARY section on page
18 for details)�
CRAWL SPACE/SEALED ATTIC CONTROL
Used as crawl space or sealed attic control (or remote
control), the Model 76 is mounted in the living space
while the dehumidifier is located in the area to be
dehumidified� When the dehumidifier is powered, the
display on the dehumidifier control will show REMOTE
to indicate that a remote control is being used� The
RH shown on the Model 76 is the RH measured at the
dehumidifier�
Remote control is typically used for crawl space or
sealed attic applications, but is also recommended
when the dehumidifier and the space being
dehumidified are inconvenient or difficult for
the homeowner to access� Examples of this type
of application include basements that may be
inconvenient to access or storage areas�
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
MODEL 76 CONTROL
FLOAT
Switch
DH DH
VENT DEH
Dampers
NC NO
NO/NC SWITCH
DH
DH
R/+
C/-
B
A
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
DH
DH
R/+
C/-
B
A
MODEL 76 CONTROL
90-1862
90-1860
FIGURE 22 – MODEL 76 EXTERNAL CONTROL WIRING
FIGURE 23 – MODEL 76 CRAWL SPACE/SEALED ATTIC (REMOTE) WIRING
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