Installation Manual

7
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 1
Installation examples (Cont'd)
DIRECT CONNECTION of both the ERV SUPPLY AIR STREAM and EXHAUST AIR STREAM
to the FURNACE COLD AIR RETURN
SIMPLIFIED INSTALLATION (GOOD)
(RETURN/RETURN METHOD) - OPTION 1
1. Furnace blower must operate when ventilation from ERV is required. The
furnace should be set to run continuously or interlocked with ERV.
See
furnace electrical connection on page 19.
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 ERV’s exhaust air connection
should be upstream of the ERV’s supply air connection when ducting to the
furnace’s cold air return.
4. Due to the difference 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 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"
Stale air to
outside
Fresh air from
outside
1 m (3' 3") min. recommended
Fresh air to
living areas
Fantech Energy Recovery Ventilator (ERV) that use a supply fan shutdown for frost preven-
tion do not include an outdoor air motorized damper. If you are using a simplied 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 ow 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 (gure 1).
Damper
Motor
24 VAC Transformer
COM
NO
ERV Furnace interlock
See page 19.
24V
120V
Figure 1
*Transformer and Damper motor not included
Suggested installation for:
• When bathroom and kitchen
already have local exhaust
system
• May be suitable for
retrotting
Benets: Least expensive
installation type