Broan ERV90HCS, HRV90H Method 2B Return-return with Automatic fresh air bypass, Stale air intake

3.INSTALLATION (CONT’D)

3.6INSTALLING THE DUCTWORK AND REGISTERS (CONT’D)

3.6.3 SIMPLIFIED INSTALLATION (AS ILLUSTRATED IN SECTION 2.3)

!WARNING

When performing duct connections, always use approved tools and materials. Respect all corresponding laws and/or safety regulations. Please refer to your local building code.

CAUTION

When performing duct connections to the furnace supply duct, unless using the optional Automatic fresh air bypass (part #15391), this duct must be sized to support the additional airflow produced by the HRV/ERV. Also, use a steel duct. For a Return-Return installation, installing the optional Automatic fresh air bypass (part #15391) eliminates the obligation to operate the furnace blower when the HRV/ERV is in operation.

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

Method 1: Supply-return connection	Method 2A: Return-return without
	Automatic fresh air bypass
	A+B= NOT LESS
MINIMUM 18”	THAN 10’ (3.1 M)
	A
(0.5 M)
STEEL DUCT	MINIMUM 3’	B
A	(0.9 M)
B
A+B= NOT LESS
THAN 10’ (3.1 M)	VJ0038

VJ0037

Method 2B: Return-return with Automatic fresh air bypass

A		AUTOMATIC FRESH
	B	AIR BYPASS

C

VJ0034

DISTANCE A: MINIMUM 3’ (0.9 M)

B+C= NOT LESS THAN 10’ (3.1 M)

Stale air intake

•Cut an opening into the furnace/air handler return duct not less than 10 feet (3.1 m) from the furnace/air handler (A+B).

•Connect this opening to the Exhaust air from building port of the HRV/ERV.

Fresh air distribution

•Same instructions as for Method 1 or Method 2, Section 3.6.2.

For Method 2 (Return-return), make sure there is a distance of at least 3 feet (0.9 m) between the 2 connections to the furnace/air handler.

NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the unit operation, but we recommend it.

CAUTION

If using Method 2, unless the optional Automatic fresh air bypass (part #15391) is installed, make sure the furnace/air handler blower operation is synchronized with the unit operation! See Section 5.

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