Aprilaire 1730A Ducting, Ducted Installation, Basement Installation, Attic Installation

Ducting

The dehumidifier is supplied with two 8” round collars. An integral backflow damper is installed in the outlet collar. In a ducted installation, the dehumidifier pulls air from the living space or HVAC return duct and supplies the dehumidified air to the HVAC supply duct (See Figures 5, 6 & 7).

Ducted Installation

•Move supply collar to the desired location, if necessary. (See Supply Collar in SET-UPSection)

•The unit can be ducted to the supply or both the return and supply. The dehumidifier inlet ducting must be a minimum of 6” upstream of the

HVAC system air cleaner and the outlet must be ducted a minimum of 6” downstream of the cooling coil.

•Use the least amount of ductwork possible. To ensure best performance, do not exceed a total of 50 feet of duct installed in accordance with

SMACNA Standards. UL approved, 8” diameter, insulated duct is recommended for all connections.

• All joints and seams must be sealed.

Figure 5 – Basement Installation

Figure 6 – Equipment Room/Closet Installation

DEHUMIDIFIED AIR IS SUPPLIED
DOWNSTREAM FROM A-COIL TO	A-COIL
MINIMIZE EVAPORATION OFF A-COIL
SUPPLY DUCT
	RETURN
	DUCT
HVAC / FURNACE
115 VAC	AIR IS PULLED
DEDICATED	FROM MAIN
CIRCUIT	RETURN DUCT
DEHUMIDIFIER	DEHUMIDISTAT WITH
	SET POINT KNOB
CONDENSATE HOSE
(TO COMMON DRAIN OR OUTSIDE)

SUPPLY DUCT

A-COIL

HVAC / FURNACE

DEHUMIDIFIED AIR IS SUPPLIED

DOWNSTREAM FROM A-COIL TO

MINIMIZE EVAPORATION OFF A-COIL

115 VAC

DEDICATED

CIRCUIT

DEHUMIDIFIER

CONDENSATE HOSE ON DEHUMIDIFIER (TO COMMON DRAIN OR OUTSIDE)

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Figure 7 – Attic Installation

	MAIN SUPPLY DUCT
	HVAC EVAPORATOR COIL
DEHUMIDIFIER	HVAC/FURNACE SYSTEM
	SHOWN IN HORIZONTAL
DEHUMIDIFIED AIR IS SUPPLIED	ORIENTATION
DOWNSTREAM FROM EVAPORATOR COIL
TO MINIMIZE EVAPORATION OFF COIL	MAIN RETURN
115 VAC
	DUCT
DEDICATED
CIRCUIT
AIR FILTER
ACCESS
DOOR	CONDENSATE
RELOCATE DEHUMIDISTAT	HOSE
	(TO COMMON
TO LIVING SPACE
	DRAIN OR
	OUTSIDE)
PRINCIPAL
LIVING SPACE

Note 1: Attic installations require the following.

1.The dehumidistat must be removed from the unit and relocated in the living space. An insulated cover plate is provided to cover the dehumidistat opening.

2.The dehumidifier must be installed in a secondary drain pan with a float switch.

Note 2: Vibration isolators placed under the dehumidifier feet are recommended when the dehumidifier is installed on ceiling joists.

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