The ST9120U universal electronic fan timers integrate control of all combustion blower and circulating fan operations in a gas warm air appliance. The basic purpose 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 New ST9120U1011 universal platform will not only integrate control of all combustion blower and circulating fan operations in a gas warm air appliance but also replace all other existing Honeywell fan timer boards. This new fan timer will save you time and money with its diagnostic LED and continuous EAC and HUM terminal connections. These new options and features make it the best fan timer for your needs.Integrates control of all combustion blower and circulating fan operations in a gas warm-air applianceReplaceable fuseDIP switch selectable heat and cool delay on and off timesDiagnostic LEDEAC and HUM convenience terminal connections and continuous low speed indoor air circulation are providedReplace existing Honeywell models: ST9101A1014, ST9120C4057, ST9141B1001, ST9160B1035, ST9101A1022, ST9120C5005, ST9150A1003, ST9160B1043, ST9120A2004, ST9120C5013, ST9150B2000, ST9160B1050, ST9120C2002, ST9120D3009, ST9150B2018, ST9160B1068, ST9120C2010, ST9120G2024, ST9150B2026, ST9160B1076, ST9120C2028, ST9120G2032, ST9150B2034, ST9160B1084, ST9120C3000, ST9120G4004, ST9150C4057, ST9160C1000, ST9120C3018, ST9120G4038, ST9160A1002, ST9160C1018, ST9120C4008, ST9120U1003, ST9160B1001, ST9120C4016, ST9141A1002, ST9160B1019, ST9120C4040, ST9141A1028, ST9160B1027