3. INSTALLATION (
CONT
’
D
)
3.5 I
NSTALLING
THE
D
UCTWORK
AND
THE
REGISTERS
9
S
TALE
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.
F
RESH
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.
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.
!
CAUTION
The ductwork is intended to be installed in compliance with all local and national codes that are applicable.
3.5.1 F
ULLY
D
UCTED
S
YSTEM
(
AS
ILLUSTRATED
IN
S
ECTION
2.1)
S
TALE
AIR
EXHAUST
DUCTWORK
:
Same as for Fully Ducted System, described on point 3.5.1 above)
F
RESH
AIR
DISTRIBUTION
:
3.5.2 E
XHAUST
D
UCTED
S
YSTEM
(
AS
ILLUSTRATED
IN
S
ECTION
2.2)
There are two methods for connecting the unit to the furnace:
M
ETHOD
1: S
UPPLY
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 illustration at right).
• Make sure that the HRV/ERV duct forms an elbow inside the furnace ductwork.
• If desired, interlock (synchronize) the furnace blower operation with
the HRV/ERV operation. (See Section 5).
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.
VJ0084
M
ETAL
DUCT
M
INIMUM
18’’ (0.5
M
)
M
ETHOD
2: R
ETURN
SIDE
CONNECTION
• 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 fresh air distribution port of the HRV/ERV
(see illustration at right).
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 5).
B
A
VJ0085
A+B=
NOT
LESS
THAN
10’ (3.1
M
)
