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VENTILATION OR AIR CYCLING
The dehumidifier has outputs available to open a normally closed damper and
introduce outdoor air though an outdoor air intake duct. Ventilation is controlled by
the Cycle Period switches, Cycle Time potentiometer, and Vent-Auto/Vent-Timed
switches. If a normally closed ventilation damper is not installed, the dehumidifier
will function in Air Cycling mode, activating the HVAC blower to cycle air through
the home based on the Cycle Period and Cycle Time.
Required Components
Aprilaire Model 6506, 6” Normally Closed Damper
24 VAC Transformer (10VA min.) for Ventilation Damper
Optional Component
8052 Outdoor Temperature Sensor
DUCTING & WIRING
FIGURE 19 – Whole-Home with Ventilation
HVAC / FURNACE
115 VAC
CIRCUIT
DEHUMIDIFIER
SUPPLY DUCT
RETURN
DUCT
A-COIL
DEHUMIDIFIED AIR IS SUPPLIED
DOWNSTREAM FROM A-COIL TO
MINIMIZE EVAPORATION OFF A-COIL
AIR IS PULLED FROM
RETURN DUCT
CONDENSATE HOSE
(TO COMMON DRAIN OR OUTSIDE)
NORMALLY CLOSED
VENT DAMPER
FLOOR DRAIN
FIGURE 20 – Ventilation Wiring
90-1536 90-1537
A +BDEH
REMOTEHVAC EQUIP
VENT
Cf
Gs Gh W -DHRf
DAMPERS
R
C
W
YY
W
G
C
R
G
SENSOR
ODT
FLOAT
SWITCH
DEHUMIDIFIER
CONTROL BOARD
24 VAC
(10 VA min)
TRANSFORMER
THERMOSTAT HVAC EQUIPMENT
OPTIONAL OUTDOOR
TEMPERATURE SENSOR
6" NORMALLY
CLOSED DAMPER
FUNCTIONS IN
AIR CYCLING
MODE IF
DAMPER NOT
INSTALLED
DETERMINE VENTILATION REQUIREMENTS
See page 14 for outdoor
temperature sensor installation.
1. The MINIMUM ventilation requirement is calculated using
ASHRAE 62.2-2007.
ASHRAE Airflow in CFM = [House Area in Sq. Ft. x 0.01]
+ [(Number of Bedrooms +1) x 7.5]
Notes: Use ‘Number of Bedrooms +1’ or the ‘Number of
Occupants’, whichever is larger.
2. Table 3 shows calculated airflow values to the nearest 5 CFM.
If more outdoor air is required, a second device is advised.
3. Record the Required CFM. __________
CALCULATING AIRFLOW REQUIREMENT
TABLE 3 – CFM Required
House Sq. Ft.
Number of Bedrooms
2 3 4 5 6
1000
35 40 50
1500
40 45 55 60 70
2000
45 50 60 65 75
2500
50 55 65 70 80
3000
55 60 70 75 85
3500
75 80 90
Ducting Note: Direct ducting the ventilation intake duct to the
dehumidifier inlet duct is acceptable if the incoming temperature
of the mixed air will be greater than 40°F and less than 100°F.
12