7
Stale air from inside
Outside
Fresh air to
living areas
1 m (3' 3")
min.
recom-
mended
Cold air
return
HRV/ furnace for Simplified Installation – Option 1
Installation examples
(Cont'd)
DIRECT CONNECTION of both the HRV SUPPLY AIR STREAM and EXHAUST AIR STREAM
to the FURNACE COLD AIR RETURN
SIMPLIFIED INSTALLATION (GOOD)
(RETURN/RETURN METHOD) - OPTION 1
Suggested installation for:
• When bathroom and kitchen
already have local exhaust
system
• May be suitable for
retrofitting
Benefits:
Least expensive
installation type
1. Furnace blower must operate when ventilation from HRV is required. The
furnace should be set to run continuously or interlocked with HRV.
2. A minimum separation of 1m (3`3’’) is recommended between the two
direct connections.
3. In order to prevent exhausting any fresh air, the HRV’s exhaust air connection
should be upstream of the HRV’s supply air connection when ducting to the
furnace’s cold air return.
4. Due to the difference 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 in the section “AIRFLOW BALANCING”
Stale air to
outside
Fresh air from
outside
* Unit airflow should be balanced while HRV is on
“Normal” speed and furnace blower is running.
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.
1 m (3' 3") min.
recommended
