ST9101A1006 ST9101A1014 ST9101A1022 ST9120A1006 ST9120A2004 ST9120B1005 ST9120C1012 ST9120C2010 ST9120C2028 ST9120C3000 ST9120C3018 ST9120C4008 ST9120C4016 ST9120C4040 ST1920C4057 ST9120C5005 ST9120C5013 ST9120D3009 ST9120G2008 ST9120G2016 ST9120G2024 ST9120G2032 ST9120G4004 ST9120G4012 ST9120G4038 ST9120C2002 APPLICATION The ST9120U Universal Electronic Fan Timers integrate control of all combustion blower and circulating fan operations in a gas warm air appliance. This control is the central wiring point for most of the electrical components 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 and run a circulating fan (up to two speeds) as required. The ST9120U also monitors limit switch strings and energizes separate ignition control systems through pressure switches. The ST9120U can replace any ST9101, ST9120, ST9141 or ST9160 listed in Table 3 click on installation link above . The ST9120U features a field-adjustable heat fan-on delay, a field-adjustable heat fan-off delay, a field-adjustable cool fan-on delay and a field-adjustable cool fan-off delay. Electronic air cleaner (EAC) and humidifier (HUM) convenience terminal connections and continuous low speed indoor air circulation are provided. |
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