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6.5.3 Simplified installation (Volume Ventilation) (as illustrated in Section 5.3)
There are two methods (figures 12 and 13) for connecting the unit to the furnace:
Method 1: return-supply Method 2: return-return
Stale air intake:
• Cut an opening into the furnace return duct (not less than 10 feet (3.1 m) from the
furnace (A+B)).
• Connect this opening to the stale air intake port on the HRV/ERV as shown .
Fresh air distribution: (same instructions as for Method 1 or Method 2, Section 6.5.2).
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.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation
with the HRV/ERV operation, but we recommend it.
17
VD0043
A
B
minimum 3’
(0.9 m)
figure 12
figure 13
CAUTION
If using Method 2, make sure the furnace blower operation is synchronized with the HRV/ERV
operation! See Section 8.4.
6.0 Installation (cont’d)
6.5 Installing the Ductwork and Registers (cont’d)
CAUTION
When performing connection to the furnace ducts (Method 1), these ducts must be sized to
support the additional airflow produced by the HRV/ERV. Also, the supply duct must be a steel
duct with a backdraft damper to prevent the risk of overheating HRV/ERV.
VD0042
A
B
Steel duct with
backdraft damper
minimum
18” (0.5 m)
A+B= not less
than 10’ (3.1 m)
A+B= not less
than 10’ (3.1 m)
WARNING
010
!
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.