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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)
1.
Furnace blower must operate when ventilation from HRV is required. The furnace should
be set to run continuously or interlocked with HRV.
on page 15.
2.
A minimum separation of 1m (39'') 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"
* In the case of a multi-zone system, please contact Fantech customer
service prior to installing any installation type requiring the use of the
furnace interlock"
ERV/Furnace ducting for Simplified Installation - Option 1
* Ductwork layout may dif-
fer depending on model
Fresh air from
outside
Stale air to
outside
* Unit air flow should be balanced while ERV is on "Normal" speed and
furnace blower is running.
Fantech heat recovery ventilators (HRV) that use a supply fan shutdown for frost preven-
tion do not include an outdoor air motorized damper. If you are using a simplified installa-
tion, 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.
If the HRV is installed such that the homeowner may turn off the HRV during the winter, we
recommend installing a motorized damper between the HRV's supply air and the furnace's
return air duct that closes when the HRV is not operating. See wiring diagram (figure 1).
You may also choose to use a Fantech HRV that uses a recirculation defrost that incorpo-
rates an outdoor air damper.
See furnace electrical connection
Air return
Air from inside
Motorized
damper
Fresh air to
living areas
Suggested installation for:
• When bathroom and kitchen
already have local exhaust
system
• May be suitable for
retrofitting
Benefits: Least expensive
installation type
1 m (3' 3")
min.
recommended
1 m (3' 3")
min.
recommended
Cold air
return
24 VAC Transformer
24V
120V
NO
COM
HRV Furnace interlock
See page 15.
Figure 1
*Transformer and Damper motor not included
7
Damper
Motor
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