Resideo S87D1004 Ignition Module

The Resideo S87D1004 Ignition Module provides reliable solid-state control for 24VAC gas-fired equipment, including furnaces, boilers, and commercial heating appliances. Engineered for direct spark ignition (DSI), this module features a two-rod flame sense configuration, utilizing separate electrodes for spark ignition and flame rectification to ensure precise local sensing. With no prepurge required, the ignition sequence is immediate, initiating an internal high-voltage spark generator for a 6-second ignition trial. If the burner fails to establish a flame, the system enters a safety lockout after a single trial, requiring a manual reset from the thermostat to protect the appliance.

Designed for compatibility with natural or LP gas, the S87D1004 is a field-proven replacement for legacy 8429-03R and 1147669 controls. It supports a maximum valve load of 2.0A and integrates seamlessly with VR8205 or VR8305 gas valves and Q347A ignition hardware. A critical feature for technicians is the 0.8-second flame failure response time, providing rapid shutdown in the event of flame loss. The integrated alarm terminal allows for remote notification during lockout conditions, ensuring minimal downtime in critical HVAC applications.

• Universal Fuel Compatibility: Field-adjustable for both liquid propane (LP) and natural gas systems.
• High-Speed Flame Detection: Responds in less than one second to flame failure to prevent gas buildup.
• Simplified Replacement: Direct OEM cross for multiple Honeywell and Resideo legacy modules.
• Robust Environmental Range: Rated for operation from -40°F to 175°F for unconditioned mechanical rooms.
• Integrated Safety: Features a 3A replaceable fuse to protect the 24V transformer from external shorts.

What does the alarm terminal do on the S87D1004?
The alarm terminal provides a 24VAC output when the module enters safety lockout, allowing for connection to a remote indicator or building management system to alert technicians of a burner failure.

How do I reset this module after a lockout occurs?
Since this is a single-trial lockout module, you must cycle the thermostat or move the system switch to OFF and back to HEAT. Ensure the call for heat is removed for at least 30 seconds to clear the internal circuit.

Can I use this with a single-rod ignition setup?
No, the S87D1004 is specifically a two-rod control requiring separate spark and sense electrodes. For single-rod applications where the flame is sensed through the spark cable, an S87A or S87B model is required.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.