Aprilaire 1770A, 1750A VENTILATION oR Air Cycling, Whole-Homewith Ventilation, Ventilation Wiring

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..

DUCTING & WIRING

Required Components

Aprilaire Model 6506, 6” Normally Closed Damper

24 VAC Transformer (10VA min..) for Ventilation Damper

Optional Component

8052 Outdoor Temperature Sensor

Figure 19 – Whole-Home with Ventilation

Figure 20 – Ventilation Wiring

DEHUMIDIFIED AIR IS SUPPLIED

DOWNSTREAM FROM A-COIL TO

MINIMIZE EVAPORATION OFF A-COIL

SUPPLY DUCT

HVAC / FURNACE

115 VAC CIRCUIT

FLOOR DRAIN DEHUMIDIFIER

A-COIL

RETURN

DUCT NORMALLY CLOSED VENT DAMPER

AIR IS PULLED FROM

RETURN DUCT

6" NORMALLY	24 VAC
CLOSED DAMPER
	(10 VA min)
	TRANSFORMER

FUNCTIONS IN	THERMOSTAT	HVAC EQUIPMENT
AIR CYCLING
MODE IF	R	R
DAMPER NOT	C	C
INSTALLED	G
		G
	W	W
	Y	Y

OPTIONAL OUTDOOR

DEHUMIDIFIER

CONTROL BOARD

T VEN DEH Rf Cf Gs Gh W DH FLOAT ODT

DAMPERS P EQUIHVACRSWITCH SENSO

CONDENSATE HOSE

(TO COMMON DRAIN OR OUTSIDE)

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.

TEMPERATURE SENSOR

See page 14 for outdoor temperature sensor installation.

A B + - REMOTE

90-1536

90-1537

DETERMINE VENTILATION REQUIREMENTS

CALCULATING AIRFLOW REQUIREMENT
1. The MINIMUM ventilation requirement is calculated using
	Table 3 – CFM Required
ASHRAE 62..2-2007..
			Number of Bedrooms
ASHRAE Airflow in CFM = [House Area in Sq.. Ft.. x 0..01]	House Sq. Ft.
+ [(Number of Bedrooms +1) x 7..5]		2	3	4	5	6
Notes: Use ‘Number of Bedrooms +1’ or the ‘Number of
	1000	35	40	50
Occupants’, whichever is larger..
	1500	40	45	55	60	70
2. Table 3 shows calculated airflow values to the nearest 5 CFM..
	2000	45	50	60	65	75
If more outdoor air is required, a second device is advised..
3. Record the Required CFM.. __________
	2500	50	55	65	70	80
	3000	55	60	70	75	85
	3500			75	80	90

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