Indoor Air Systems Air Conditioner User Manual

22
Simplified Installation
Option 1
(Return/Return Method)
Note: Option 1 is the preferred / recommended method
when doing a simplified installation.
Example diagram only - duct configuration
may change depending on model
*Unit is normally balanced on HIGH speed 
with furnace blower ON.
RETURN AIR
DIRECT CONNECTION of both the HRV/ERV SUPPLY AIR STREAM and 
EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN
40" (1m) MINIMUM
→
→
Outdoors
Cool Air
Return
NOTES:
1. Furnace blower may be required to operate when ventilation from HRV/ERV is required. 
The furnace should be set to run continuously or interlocked with HRV/ERV. 
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/ERV and the equipment it is being
connected to, the HRV/ERV's airflow must be confirmed on site, using the balancing
procedure found in the installation manual.
3’ min.
recommended
Forced Air
Furnace