Universal Hot Surface Ignition Module, 24VAC

The Honeywell S8910U3000/U Universal Hot Surface Ignition Module ensures safe, reliable burner ignition and flame monitoring for gas-fired heating systems.

The Honeywell S8910U3000/U is a universal Hot Surface Ignition (HSI) control module designed to manage the ignition sequence and burner operation in gas-fired furnaces, boilers, and heating units. Operating on 24 VAC, it features a 32-second prepurge cycle and provides precise timing control for ignition, flame sense, and safety shutoff. Its universal design allows for easy replacement of many Honeywell and competitive ignition modules, ensuring efficient system compatibility and simplified field service.

• Model number S8910U3000/U identifies the Honeywell Universal Hot Surface Ignition Module for use in 24 VAC gas heating systems.
• Provides safe, controlled ignition sequencing and automatic flame detection for reliable operation.
• Designed for universal replacement compatibility with many existing Honeywell and OEM ignition modules.

Technical Data & Performance

• Product Type: Hot Surface Ignition (HSI) Module.
• Brand: Honeywell.
• Model: S8910U3000/U.
• Application: Gas-fired heating appliances such as furnaces, boilers, unit heaters, and infrared heaters.
• Input Voltage: 24 VAC nominal (operating range 18–30 VAC, 50/60 Hz).
• Control Current Draw: 2.0 Amps maximum at 24 VAC.
• Output Voltage: 24 V signal to gas valve and hot surface igniter.
• Prepurge Time: 32 seconds standard prepurge period before ignition.
• Ignition Trial Time: 7 seconds typical.
• Warm-Up Time: 17 seconds nominal for igniter heating.
• Lockout Time: After one failed ignition attempt; resets upon power interruption.
• Ignition Type: Hot Surface Ignition (HSI) – direct burner ignition using a silicon carbide or silicon nitride igniter.
• System Type: Single-stage gas valve control.
• Flame Detection: Flame rectification through the hot surface igniter or separate flame rod.
• Safety Shutoff: Automatic gas valve shutoff on ignition or flame failure.
• Operating Temperature Range: -40°F to +175°F (-40°C to +79°C).
• Humidity Rating: Up to 95% RH non-condensing.
• Enclosure: Compact, high-impact housing with integrated mounting flanges.
• Mounting Type: Surface-mounted with universal mounting hole pattern.
• Electrical Connections: ¼-inch quick-connect terminals for fast installation and secure wiring.
• Time Functions:
  • Prepurge: 32 seconds.
  • Igniter Warm-Up: 17 seconds.
  • Trial for Ignition: 7 seconds.
• Diagnostic Features: LED status indicator provides fault codes for quick troubleshooting.
• Pressure Switch Monitoring: Integrated input for airflow or pressure verification.
• Compliance:
  • Certified to UL 372 and CSA C22.2 No. 199-M89 standards.
  • Meets ANSI Z21.20 requirements for automatic gas ignition systems.
• Compatibility: Replaces Honeywell S89, S890, and many competitive ignition modules.
• Protection Features:
  • Automatic retry and lockout for ignition failures.
  • Reverse polarity protection for safe installation.
  • Transient voltage suppression for circuit durability.
• Dimensions (Approximate): 5.25" L × 3.5" W × 1.5" D.
• Weight: ~0.5 lb.
• Installation: Universal retrofit design allows easy field replacement using included wiring harness and instructions.
• Maintenance: Solid-state electronics require minimal maintenance; check wiring and ground connection periodically.
• Packaging: Supplied as a complete module kit with installation hardware and detailed instructions.
• Warranty: Protected by Honeywell’s Limited Manufacturer’s Warranty for material and functional reliability.

Applications & Benefits

• Replaces multiple Honeywell and competitive ignition controls for simplified inventory and field service.
• Provides consistent, safe burner ignition with built-in prepurge and flame-sensing reliability.
• LED diagnostics simplify system troubleshooting and reduce downtime.
• Ideal for furnaces, boilers, rooftop units, and industrial heaters with hot surface ignition.
• Universal design minimizes installation complexity and ensures broad equipment compatibility.