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Installation examples (Cont'd)
DIRECT CONNECTION of the FRESH air to living area to the RETURN PLENUM
of the FORCED AIR SYSTEM (Stale air drawn from key areas of home)
PARTIALLY DEDICATED SYSTEM (BETTER)
1.
Forced air system blower must operate when ventilation from FAA is required.
The system should be set to run continuously or interlocked with FAA.
forced air system electrical connection.
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 forced air system.
4.
Before operation, the FAA's airflow must be balanced on site. For this, use the
procedure found in the section "AIRFLOW BALANCING". During the balancing
procedure, make sure the forced air system blower is running and the FAA is
running at "Normal" speed.
5.
In the case of a multi-zone system, please contact Fantech customer
service prior to installing any installation type requiring the use of the
forced air system interlock.
6.
The FAA should only be paired with one forced air system. In the case
where there are more than one forced air system please contact Fantech
customer service prior to making a product selection.
FAA/Forced Air System Interlock ducting for Partially Dedicated System
* Ductwork layout may
differ depending on model
Outside
Fresh air from
outside
Stale air to
outside
For Fresh Air Appliances (FAAs) that do not include an outdoor air motorized damper: If
you are using a partially dedicated or simplified installation, i.e. connecting the FAA supply
air duct to a forced air system'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 forced air
system's blower will continue to draw in outdoor air through the FAA. When this happens,
the introduction of unconditioned outdoor air to the indoors can increase the load on the
system.
If the FAA is installed so that the homeowner can turn off the FAA, we recommend install-
ing a motorized damper between the FAA's supply air and the forced air system's return
air duct that will close when the FAA is not operating. To install a damper accessory to the
product, locate the auxiliary connector on the side of the electrical box. See Figure 1. Us-
ing the included wire harness, connect the damper accessory to the product.
6
Air return
Air from inside
Fresh air to
living areas
Suggested installation for:
• Forced air system (central
furnace or central air
conditioner)
• When ducting fresh air to
living area is not possible or
practical, i.e. expensive or
See
when the forced air system
will operate year-round
• Recommended install for
units with a built-in outdoor
air motorized damper (such
as the FIT 120E-D & the FIT
120E-D-EC) to avoid drawing
outdoor air directly into the
forced air system when the
unit is not running
Benefits: Conditions the fresh
air prior to distributing it
throughout the house
1 m (3' 3")
min.
recommended
Cold air
return
Figure 1
*Auxiliary connector for external damper wire
harness, damper motor not included.
Forced Air
System
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