13
6. Installation
(cont’d)
6.4 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
WARNING
Never install a stale air exhaust register in a room where there is a combustion device, such as a
gas furnace, a gas water heater or a fireplace.
!
6.4.1
Fully Ducted System
(as illustrated in Section 5.1)
Stale air exhaust ductwork:
•
Install registers in areas where contaminants are produced: Kitchen, bathrooms, laundry room, etc.
•
Install registers 6 to 12 inches (152 to 305 mm) from the ceiling on an interior wall OR install them in
the ceiling.
•
Install the kitchen register at least 4 feet (1.2 m) from the range.
•
If possible, measure the velocity of the air flowing through the registers. If the velocity is higher
than 400 ft/min. (122 m/min), then the register type is too small. Replace with a larger one.
Fresh air distribution ductwork:
•
Install registers in bedrooms, dining room, living room and basement.
•
Install registers either in the ceiling or high on the walls with air flow directed towards the ceiling.
(The cooler air will then cross the upper part of the room, and mix with room air before descending to
occupant level.)
•
If a register must be floor installed, direct the air flow up the wall.
6.4.2
Exhaust Ducted System
(Source Point Ventilation) (as illustrated in Section 5.2)
Stale air exhaust ductwork:
(same as for Fully Ducted System, described on point 6.4.1)
Fresh air distribution:
There are two methods for connecting the unit to the furnace:
Method 1: Supply side connection
• Cut an opening into the furnace supply duct at least
18 inches (0.5 m) from the furnace.
• Connect this opening to the fresh air distribution port of the
HRV/ERV (use
metal duct
, see figure 9).
• Make sure that the HRV/ERV duct forms an elbow inside the
furnace ductwork.
• If desired, interlock (synchronize) the furnace blower opera-
tion with the HRV/ERV operation. (See Section 8.3).
Method 2: Return side connection
• Cut an opening into the furnace return duct not less than
10 feet (3.1m) from the furnace (A+B).
• Connect this opening to the fresh air distribution port of the
HRV/ERV (see figure 10).
NOTE: For Method 2, it is not essential that the furnace
blower runs when the unit is in operation, but we
recommend it. If desired, synchronize the furnace
blower operation with the HRV/ERV 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.
CAUTION
When performing duct connection to the furnace supply duct, this duct must be sized to support
the additional airflow produced by the ERV/HRV. Also, use 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.
!
VD0172
Minimum
18” (0.5 m)
Metal duct
figure 9
B
A
VD010
8
A+B = not less
than 10’ (3.1 m)
figure 10
CAUTION
The ductwork is intended to be installed in compliance with all local and national codes that are applicable.
