ST9120U Overview
ST9120U Universal Electronic Fan Timers APPLICATION The ST9120U Universal Electronic Fan Timers integrate control of all bustion blower and circulating fan operations in a gas warm air appliance. This control is the central wiring point for most of the electrical ponents in the furnace. The basic purposes of the ST9120U are to monitor the thermostat for heat, cool and fan demands, run the induced draft blower motor...