8
Air from inside
* Unit air flow should be balanced while ERV is on "Normal" speed and
furnace blower is running.
Outside
1 m (3' 3") min.
recommended
Cold air
return
* Ductwork layout may
differ depending on model
ERV/Furnace ducting for Simplified Installation - Option 2
DIRECT CONNECTION of the ERV 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 ERV is required. The
furnace should be set to run continuously or interlocked with ERV.
2. Due to the differences in pressure between the ERV and the equipment it is
being connected to, the ERV‘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.
Suggested installation for:
•
When bathroom and
kitchen already have local
exhaust system
•
May be suitable for
retrofitting
Benefits:
Least expensive
installation type
Fresh air to living areas
Stale air to
outside
Fresh air from
outside
Fantech energy recovery ventilators (ERV) that use a supply fan shutdown for frost preven-
tion do not include an outdoor air motorized damper. If you are using a simplified instal-
lation, i.e. connecting the ERV supply air duct to a furnace's return air duct, the ERV must
operate continuously. When the ERV is turned off, no warm exhaust air will flow through
the ERV 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 ERV is installed such that the homeowner may turn off the ERV during the winter, we
recommend installing a motorized damper between the ERV's supply air and the furnace's
return air duct that closes when the ERV is not operating. See wiring diagram (figure 1).
Damper
Motor
24 VAC Transformer
COM
NO
ERV Furnace interlock
See page 17.
24V
120V
Figure 1
*Transformer and Damper motor not included
