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6
INSTALLATION EXAMPLES (CONT'D)
DIRECT CONNECTION of the FRESH air to living area to the RETURN PLENUM
of the AIR HANDLER (Stale air drawn from key areas of home)
PARTIALLY DEDICATED SYSTEM (BETTER)
1.
In order to provide proper distribution of the fresh air, it is
recommended that the furnace blower be set to run continuously or
interconnected with HRV.
page 15.
2.
Stale air is drawn from key areas of the home (bathroom, kitchen,
laundry room).
3.
Fresh air is supplied to the return air plenum of the furnace.
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"
HRV/Furnace ducting for Partially Dedicated System
* Ductwork layout may dif-
fer depending on model
Fresh air from
outside
Stale air to
outside
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 on
Air return
Air from inside
Fresh air to
living areas
* Unit air flow should be balanced while ERV is on "Normal" speed and
furnace blower is running.
Suggested installation for:
• Central furnace (air
handling unit or central air
conditioners)
• When ducting fresh air to
living area is not possible or
practical, i.e. expensive or
when the central AHU will
operate year-round.
Benefits: Conditions the fresh
air prior to
distributing it throughout the
house
Make sure the HRV is
capable of meeting the
required airflow rate.
1 m (3' 3")
min.
recommended
Motorized
damper
Cold air
return
24 VAC Transformer
24V
120V
NO
COM
HRV Furnace interlock
See page 15.
Figure 1
*Transformer and Damper motor not included
Damper
Motor
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