HVAC EQUIPMENT
RETURN
SUPPLY
SUPPLY
HVAC EQUIPMENT
RETURN
SUPPLY
HVAC EQUIPMENT
RETURN
MAIN RETURN TO MAIN SUPPLY
MAIN RETURN TO MAIN RETURN – RECOMMENDED
DEDICATED RETURN TO MAIN SUPPLY OR RETURN
DEDICATED RETURN TO DEDICATED SUPPLY
SHEET 2 – SINGLE ZONE USING EXTERNAL CONTROL
PARTS NEEDED
(ADDITIONAL PARTS MAY BE REQUIRED)
• Model E080/E100/E130
• Insulated duct
• Duct fittings & hardware
• Grilles (if required)
• Drain pan and float switch (if required)
• Thermostat wire
• 20A outlet (E130 only)
• Model 76, Model 8620 or Model 8910 control
WIRING EXTERNAL CONTROL
(SHOWN WITHOUT
“DISABLE WITH AC” FEATURE BEING USED)
FIGURE 1
– DEHUMIDIFIER DUCTED TO HVAC SYSTEM
FIGURE 2
– DEHUMIDIFIER DUCTED DIRECTLY
EXTERNAL CONTROL
The external control (i.e. Aprilaire Model 76 Dehumidifier
Control, Model 8620 Thermostat or Model 8910 Home
Comfort Control) must have a normally open (NO – all
Aprilaire controls are normally open type) or normally closed
(NC) dry contact output, and must be installed in the space
that is going to be dehumidified. Select the type of control
using the NO/NC dip switch on the dehumidifier control.
SEQUENCE OF OPERATION
When the external control calls for dehumidification, the
dehumidifier blower and HVAC blower (if this option has been
wired – see
WIRING EXTERNAL CONTROL
above) turn on,
then three seconds later the compressor turns on. All will turn
off when the external control stops calling for dehumidification.
G
W
A
B
C /-
R /+
DH
DH
R
C
G
W
Y
EXISTING WIRE
NEW WIRE
EXTERNAL CONTROL
(MODEL 76 SHOWN)
ODT
SENSOR
DH DH
REMOTE
+
-
A
B
Gh
Rf
Cf
Gs
W
Y
DAMPERS
VENT
DEH
FLOAT
SWITCH
NC
NO
R
C
Y
WIRING TO THE HVAC
SYSTEM IS REQUIRED
IF DUCTING RETURN
TO RETURN, OPTIONAL
FOR ALL OTHER
INSTALLATIONS.
HVAC
EQUIPMENT
THERMOSTAT OR
ZONE CONTROL
BOARD
HVAC EQUIP
DEHUMIDIFIER
CONTROL BOARD
3