Broan HRV90H Service Manual download pdf (Page 11)

3. INSTALLATION (CONT’D)

3.6 INSTALLING THE DUCTWORK AND REGISTERS (CONT’D)

3.6.2 CENTRAL DRAW POINT SYSTEM (AS ILLUSTRATED IN SECTION 2.2)

Stale air exhaust ductwork:

Same as for Fully Ducted System, described on point 3.6.1

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 (0.5 m) from the

furnace/air handler.

• Connect this opening to the Fresh air to building port of the HRV/ERV (use steel

duct, see figure at right).

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

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

Section 5).

Method 2: Return side connection

• Cut an opening into the furnace return duct not less than 10 feet (3.1 m) from the

furnace/air handler (A+B).

• Connect this opening to the Fresh air to building port of the HRV/ERV(see figure at right).

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

operation, but we recommend it. If desired, interlock (synchronize) the furnace/air

handler blower operation (see Section 5).

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 HRV/ERV. Also, use a steel duct. It is recommended that the HRV/ERV is running when the furnace is in

operation to prevent backdrafting inside HRV/ERV.

VJ0036

STEEL DUCT

MINIMUM 18"

(0.5 M)

VJ0035

A+B= NOT LESS

THAN 10' (3.1 M)

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Broan HRV90H Service Manual Page 11