Installation Guide

3. INSTALLATION (CONT’D)

3.5 INSTALLING THE DUCTWORK AND REGISTERS (CONT’D)

3.5.2 CENTRAL DRAW POINT SYSTEM

Stale air exhaust ductwork

Same as for Fully Ducted System, described on point 3.5.1

Fresh air distribution ductwork

• There are 2 methods for connecting the unit to the furnace/air handler:

Method 1: Supply side connection

• Cut an opening into the furnace supply duct at least 18 inches from the furnace/

air handler.

• Connect this opening to the Fresh air distribution port of the unit (use metal

duct, see figure at right).

• Make sure the unit duct forms an elbow inside the furnace/air handler ductwork.

• If desired, interlock (synchronize) the furnace/air handler blower operation (see

Section 5 ELECTRICAL CONNECTION TO THE FURNACE).

Method 2: Return side connection

• Cut an opening into the furnace return duct not less than 10 feet from the furnace/

air handler (A+B).

• Connect this opening to the Fresh air distribution port of the unit (see figure at

right).

NOTE: For Method 2, it is not essential that the furnace/air handler runs when the

unit is operation, but we recommend it. If desired, interlock (synchronize)

the furnace/air handler blower operation (see Section 5 ELECTRICAL

CONNECTION TO THE FURNACE).

WARNING

When performing duct connections, always use approved tools and materials. Respect all corresponding laws and

safety regulations. Please refer to your local building code.

CAUTION

When performing duct connections to the furnace supply duct, this duct must be sized to support the additional

airflow produced by the unit. Also, the use of metal duct is highly recommended.

VJ0128

METAL DUCT

MINIMUM 18"

VJ0129

A+B = NOT LESS

THAN 10’