6
fantech
HRV/ Furnace ducting for Partially Dedicated System
Stale air from inside
* Unit airflow 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
Stale air to
outside
Fresh air from
outside
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.
See furnace electrical connection on
page 17.
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"
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.
Damper
Motor
24 VAC Transformer
COM
NO
HRV Furnace interlock
See page 17.
24V
120V
Figure 1
*Transformer and Damper motor not included
Motorized Damper
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
Summary of Contents for 99203
Page 20: ...20 fantech NOTES...
Page 41: ...41 fantech Notes...
Page 42: ...42 fantech Notes...
Page 43: ...43 fantech Notes...
