Technical data

3. INSTALLATION (CONT’D)

3.5 INSTALLING THE DUCTWORK AND THE REGISTERS (CONT’D)

When performing duct connection to the furnace ducts (Method 1), these ducts must be sized to support the

additional airflow produced by the ERV/HRV. Also, the supply duct must be a metal duct. It is recommended that

the ERV/HRV is running when the furnace is in operation in order to prevent backdrafting inside ERV/HRV.

3.5.3 SIMPLIFIED INSTALLATION (AS ILLUSTRATED IN SECTION 2.3)

There are two methods (illustrated below) for connecting the unit to the furnace ducts:

ETHOD 1: RETURN-SUPPLY METHOD 2: RETURN-RETURN

When performing duct connection to the furnace, installation must be done in accordance with all applicable

codes and standards. Please refer to your local building code.

If using Method 2, make sure the furnace blower operation is synchronized with the unit operation! See Section 5.

MINIMUM

3’ (0.9 M)

STALE AIR INTAKE:

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

• Connect this opening to the stale air intake port of the HRV/ERV (as shown above).

FRESH AIR DISTRIBUTION:

Same instructions as for Method 1 or Method 2, section 3.5.2 in previous page)

A+B= NOT LESS

THAN 10’ (3.1 M)

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METAL DUCT

MINIMUM

18’’ (0.5 M)

A+B= NOT LESS

THAN 10’ (3.1 M)

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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

duct.

NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the HRV/ERV operation, but we

recommend it.

CAUTION

WARNING