Month: March 2008

Setting a Barometric Bypass Damper

General Instructions for Residential and Light Commercial Barometric Bypass Dampers HOW THE BYPASS DAMPER WORKS As the individual zone dampers close, the system static pressure will tend to rise.  In order to maintain constant airflow through the HVAC system, a barometric bypass damper will be required to bypass some of the discharge air back into […]

Miscellaneous Technical Zoning Notes

1) A thermostat controlling an electric furnace must have the fan switch set in the “electric” position so that the fan is energized immediately with a call for heating. 2) A thermostat controlling a gas furnace should have the fan switch set in the “gas” position so that the furnace controls the fan operation. 3) […]