17
The Simplified Installation (Return/Return Method)
Defrost air port needs to be drawn from clean
area without combustion appliances. To avoid
backdrafting of combustion products, never
draw defrost air from a room with a naturally
aspirated appliance, i.e. furnace, hot water
heater, gas dryer, stove, fire place etc.
WARNING
Air
Handler
Outdoors
*Unit is normally balanced on
HIGH speed with air handler
blower ON.
Cool Air
Return
Return Air
Fresh Air From Outside
3' (1 m) min.
recommended
Stale Air To Outside
Stale Air From Building
Fresh Air To House
High efficiency filter
or electronic air cleaner
Field-supplied
Balancing Damper
(optional)
FIVE PORT MODELS - Simplified Installation for Models RNC10/RNC20
Weatherhood arrangement - requires a minimum
of 6' (2m) separation and a minimum of 18" (460mm)
clearance above grade or anticipated snow level.
CAUTION
•
It is mandatory that the furnace run continuously or HRV
operation be interlocked with the furnace.
•
Check local codes/authority having jurisdiction for
acceptance.
HRV must be balanced.
Refer to “Airflow Balancing” in this manual.
WARNING
RETURN AIR
DIRECT CONNECTION of both the HRV SUPPLY AIR STREAM and
EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN
Outdoors
Cool Air
Return
NOTES:
1. Furnace blower is required to operate when ventilation from HRV is required.
The furnace must be set to run continuously or interlocked with HRV.
2. A minimum separation of 40 inches (1 m) is required between the two direct connections.
3. The exhaust air connection should be upstream of the supply air connection to prevent
exhausting any fresh air.
4. Weatherhood arrangement is for drawing purposes only. Six feet (2 m) minimum separation
required. Eighteen inches (460 mm) above grade minimum.
5. Due to the differences in pressure between the HRV and the equipment it is being
connected to, the HRV's airflow must be confirmed on site, using the balancing
procedure found in the installation manual.
3' (1 m) min.
recommended
Forced Air
Furnace
40" (1m) MINIMUM
FOUR PORT MODELS
40" (1m) MINIMUM
*Unit is normally balanced on
HIGH speed with air handler
blower ON.
