ST9120U1011 | Honeywell Universal Electronic Fan Timer Control Board for Gas Furnace Blower and Fan Sequencing

Honeywell · HVAC & Building Controls

Description  The Honeywell ST9120U1011 is a universal electronic fan timer control board designed to manage combustion blower and circulating fan operation in gas warm air furnace systems. This module provides timed control for heating and cooling fan delays while supporting optional humidifier and electronic air cleaner connections. The ST9120U1011 ensures stable sequencing performance and compatibility across multiple furnace platforms.     Technical Specifications  Condition New/Never Used Surplus Brand Honeywell Category HVAC Controls Part Number ST9120U1011 Subcategory Fan Timer Control Board Product Type Universal Electronic Fan Timer Control Voltage 24 VAC Power Voltage Requirements 18–30 VAC, 60 Hz Fan Motor Support Circulating fan up to two speeds Heating Delay On Adjustable: 30 or 60 seconds Heating Delay Off Adjustable: 60, 100, 140, or 180 seconds Cooling Delay On Adjustable: 4 or 30 seconds Cooling Delay Off Fixed: 30 seconds Accessory Outputs HUM and EAC terminals included Fuse Type Replaceable onboard fuse Operating Temperature Range -40°C to +79°C Dimensions 3.5"D × 7.6"W × 3.5"H Weight 0.98 lbs Information About ST9120U1011 The ST9120U1011 is a Honeywell universal fan timer module built as a central control board for blower and circulating fan management in gas heating appliances. It is designed for broad replacement compatibility, covering multiple legacy Honeywell fan timer series to simplify service and inventory needs. The board includes configurable timing controls through onboard DIP switches, allowing field adjustment of heat and cool fan delay settings. It also supports accessory integration through dedicated terminals for electronic air cleaners and humidifiers, providing expanded HVAC system control options. Key Features: Universal Fan Timer Control Board: Integrates combustion blower and circulating fan operation in gas furnace applications. Multi-Model Replacement Capability: Designed to replace numerous Honeywell ST9120, ST9101, ST9141, and ST9160 boards. Adjustable Heat and Cool Fan Delays: Field-selectable delay-on and delay-off settings through DIP switch configuration. LED Diagnostic System Indicator: Provides onboard system status feedback for troubleshooting support. HUM and EAC Accessory Connections: Includes terminal outputs for humidifier and electronic air cleaner integration. Two-Speed Circulating Fan Support: Controls circulating fan demand operation with up to two selectable speeds. Replaceable Fuse Protection: Equipped with an onboard serviceable fuse for improved electrical protection. Continuous Circulation Option: Supports optional continuous low-speed indoor air circulation when configured. The ST9120U1011 delivers the reliability and precision required for furnace blower sequencing and fan timing control in HVAC heating and cooling systems.

Brand: Honeywell · Category: HVAC & Building Controls

Key features

• Universal Fan Timer Control Board: Integrates combustion blower and circulating fan operation in gas furnace applications.
• Multi-Model Replacement Capability: Designed to replace numerous Honeywell ST9120, ST9101, ST9141, and ST9160 boards.
• Adjustable Heat and Cool Fan Delays: Field-selectable delay-on and delay-off settings through DIP switch configuration.
• LED Diagnostic System Indicator: Provides onboard system status feedback for troubleshooting support.
• HUM and EAC Accessory Connections: Includes terminal outputs for humidifier and electronic air cleaner integration.
• Two-Speed Circulating Fan Support: Controls circulating fan demand operation with up to two selectable speeds.
• Replaceable Fuse Protection: Equipped with an onboard serviceable fuse for improved electrical protection.
• Continuous Circulation Option: Supports optional continuous low-speed indoor air circulation when configured.

Specifications

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