Products1
Central Fan Integrated Supply Ventilation with Fan and Damper
Cycling – The Basics
The simplest, most effective, economical, and reliable way to
introduce fresh air in homes with central forced air systems is to use
the central fan to pull in and distribute a controlled amount of outside
air. This central fan integrated supply ventilation approach depends on
two control processes:
FAN CYCLING: Fan cycling assures that the central air handler
fan will run enough to distribute ventilation air and evenly mix air
throughout the house, even when there is no demand for heating or
cooling. But rather than operate the fan continuously or by a simple
timer, the FanCycler® method factors in prior operation—it does not run
the central fan for ventilation when operation for heating or cooling
has already accomplished the necessary ventilation and mixing. In this
way, the FanCycler method saves energy as well as wear and tear on
equipment.
VENTILATION DAMPER CYCLING: Integrating a motorized
ventilation damper with fan cycling limits over-ventilation during long
heating or cooling cycles and saves the energy of unnecessarily
conditioning this “extra” outside air. The damper opens when the fan is
on unless enough time has already expired for the introduction of
ventilation air.
Sources for Controls that can do both Fan and Damper Cycling
 Aprilaire®,
Model 8120 Controller
Model 8126 Kit (includes motorized damper)
Research Products Corporation--Aprilaire
P.O. Box 1467
Madison, WI 53701-1467
608.257.8801 fax 608.257.4357
www.aprilaire.com
www.aprilairecontractor.com/products/category/ventilation/
Aprilaire® Model 1750 Whole-house Dehumidifier
with onboard control for central system fan and
ventilation damper cycling
www.aprilairecontractor.com/products/category/dehumidifiers/
 SCI
Model ERV-24-SUPER Thermostat with FanCycler®
Systems Controls & Instruments USA, LLC
4037 Charter Club Drive
PO Box 1512
Doylestown, PA 18901
800.663.8107 215.766.1487 fax: 215.230.9532
www.scillc.com
or contact Masco Contractor Services, 866-912-7233, Kathy Maston
 AirCycler® (Several Models)
411 Plain Street - Marshfield, MA 02050
781.834.1600 fax: 781.834.1601
www.aircycler.com
1The fan and damper cycling methods
described here are protected by one or more of the following patents: US
5,547,017; 5,881,806; 6,431,268; CA 2,245,135. |
