Installation Manual Essentials 120213
2
BEFORE BEGINNING INSTALLATION
SYSTEM REQUIREMENTS
The IAQ Economizer was designed for use with constant speed fans installed on systems using
conventional thermostats. The IAQ Economizer can be installed on systems with proprietary or
communicating thermostats, but these installations will not have the full range of features
available to a conventional system.
Systems with a modulating fan have several options for installation. Visit
famcoiaq.com/MANUALS for wiring with modulating fans.
Visit famcoiaq.com/MANUALS for wiring FAMCO for use with heat pumps.
Verify that the existing system is operating properly. Initiate a call for cooling and observe
operation of the blower and condensing unit, and delivery of cooled air.
INSTALLATION
IMPORTANT: Turn off the HVAC system at the breaker box before beginning installation.
Do not use the existing furnace transformer to power the IAQ Economizer. The furnace
transformer is not sized to support proper economizer operation.
Straightness of ductwork matters. Avoid sharp bends in ductwork. Watch out for flex duct
that may become misshapen if required to turn close to the connection to the damper box.
Proper operation requires that at a minimum an equal amount of air passes over the
evaporator coil as in normal return air operation. Insure that air volume is not negatively
impacted by the installation of damper box.
It is the installers’ responsibility to insure the
appropriate volume of air is available. Poor installation may adversely affect available air
volume and could damage HVAC system.
Do not allow the thermostat “Fan call” to run the blower fan below the mechanical cooling
speed as this will result in poor performance. In the case of free-cooling, more air is better.
