Installation – Broan Fresh Air System ERV90HCS User Manual

Page 11

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3. INSTALLATION

(CONT’D)

3.6 I

NSTALLING THE

D

UCTWORK AND

R

EGISTERS

(

CONT

D

)

3.6.2 C

ENTRAL

D

RAW

P

OINT

S

YSTEM

(

AS ILLUSTRATED IN

S

ECTION

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 beside).

• Make sure the HRV/ERV duct form 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 beside).

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).

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.

0

!

VJ0036

B

A

VJ0035

MINIMUM

18”

(0.5

M

)

A+B=

NOT LESS

THAN

10’ (3.1

M

)

STEEL DUCT

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