8
* Ductwork layout may differ depend-
ing on model
DIRECT CONNECTION of the HRV SUPPLY AIR STREAM to the SUPPLY AIR SIDE on the
FURNACE & EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN
SIMPLIFIED INSTALLATION (GOOD)
OPTION 2
1. Furnace blower must operate when ventilation from HRV is required. The
furnace should be set to run continuously or interlocked with HRV.
2. Due to the differences in pressure between the HRV and the equipment it is
being connected to, the HRV‘s airflow must be balanced on site, using the
procedure found section "AIRFLOW BALANCING".
Installation examples
(Cont'd)
In the case of a simplified
installation, Option 1 is
recommended.
Air from inside
* Unit air flow should be balanced while HRV is on "Normal" speed and
furnace blower is running.
Outside
Fresh air to living areas
1 m (3' 3") min.
recommended
Cold air
return
HRV/Furnace ducting for Simplified Installation - Option 2
Suggested installation for:
• When bathroom and
kitchen already have local
exhaust system
• May be suitable for
retrofitting
Benefits:
Least expensive
installation type
Fantech heat recovery ventilators (HRV) that use a supply fan shutdown for frost prevention do not include an outdoor air motorized damper. If you
are using a simplified installation, i.e. connecting the HRV supply air duct to a furnace's return air duct, the HRV must operate continuously. When
the HRV is turned off, no warm exhaust air will flow through the HRV but the furnace's fan will continue to draw in outdoor air directly into the
furnace. If it's cold outside, cold air will be introduced, without re-heating, directly into the furnace.
Motorized
Damper
Stale air to
outside
Fresh air from
outside
