14
6. Installation
(cont’d)
6.4.3 Simplified installation
(Volume Ventilation) (as illustrated in Section 5.3)
There are two methods (figures 11 and 12) 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).
• 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 6.4.2).
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 unit operation,
but we recommend it.
6.4 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
(
CONT
’
D
)
B
A
VD0171
B
A
VD0111
Minimum 3’
(0.9 m)
Metal duct
Minimum 18”
(0.5 m)
figure 12
figure 11
CAUTION
If using Method 2, make sure the furnace blower operation is synchronized with the unit operation!
See Section 8.3.
WARNING
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.
!
A+B = not less
than 10’ (3.1 m)
A+B = not less
than 10’ (3.1 m)
CAUTION
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.
