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 17) 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
TWO ZONE – PRIMARY AND SECONDARY 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 17 – MODEL 76 EXTERNAL CONTROL WIRING
FIGURE 18 – MODEL 76 CRAWL SPACE/SEALED ATTIC (REMOTE) WIRING
English 13