Simplified Installation - Fantech ATMO Series Installation And Operation Manual

INSTALLATION EXAMPLES (CONT'D)
DIRECT CONNECTION of both the FAA 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 FAA is required. The furnace should
be set to run continuously or interlocked with FAA.
on page 16.
2. A minimum separation of 1m (39'') is recommended between the two direct
connections.
3. In order to prevent exhausting any fresh air, the FAA's exhaust air connection should be
upstream of the FAA's supply air connection when ducting to the furnace's cold air return.
4. Due to the difference in pressure between the FAA and the equipment it is being
connected to the FAA'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"
FAA/Furnace ducting for Simplified Installation - Option 1
* Ductwork layout may dif-
fer depending on model
Fresh air from
outside
Stale air to
outside
Fantech fresh air appliances (FAA) that use a supply fan shutdown for frost prevention do
not include an outdoor air motorized damper. If you are using a simplified installation, i.e.
connecting the FAA supply air duct to a furnace's return air duct, the FAA must operate
continuously. When the FAA is turned off, no warm exhaust air will flow through the FAA
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 FAA is installed such that the homeowner may turn off the FAA during the winter, we
recommend installing a motorized damper between the FAA's supply air and the furnace's
return air duct that closes when the FAA is not operating. See wiring diagram (figure 1).
You may also choose to use a Fantech FAA that uses a recirculation defrost that incorpo-
rates an outdoor air damper.
Air return
Air from inside
* Unit air flow should be balanced while FAA is on "Normal" speed and
furnace blower is running.
See furnace electrical connection
1 m (3' 3")
min.
recommended
Motorized
damper
1 m (3' 3")
Fresh air to
min.
recommended
living areas
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
retrofitting
Benefits: Least expensive
installation type
Cold air
return
24 VAC Transformer
24V
NO
COM
ERV Furnace interlock
See page 16.
7
Damper
Motor