Honeywell S8701A1122 Direct Spark Ignition Module 21 Sec. Lockout

The Honeywell S8701A1122 is a Direct Spark Ignition (DSI) module engineered to deliver dependable ignition sequencing and safety lockout control for gas-fired heating appliances. Designed for use in residential and light commercial furnaces and heating systems, this module monitors the ignition trial and initiates a 21-second lockout if flame is not established within the trial period — protecting equipment and occupants from unsafe operating conditions.

How It Works

On a call for heat, the S8701A1122 energizes the igniter and gas valve simultaneously. The module continuously monitors the flame sensor signal during the trial-for-ignition period. If flame is not detected within 21 seconds, the module locks out, de-energizes the gas valve, and requires a manual reset or power interruption to restart — preventing unburned gas accumulation.

Key Features

• Direct Spark Ignition (DSI) control with integrated flame sensing
• 21-second trial-for-ignition with automatic safety lockout
• Locks out gas valve upon failed ignition to prevent hazardous conditions
• Compact module design for straightforward OEM and replacement installations
• Compatible with standard gas furnace and heating appliance control circuits
• Reliable Honeywell ignition control technology trusted by HVAC professionals

Application

• Residential and light commercial gas furnaces
• Gas-fired heating appliances requiring DSI control
• OEM replacement for systems originally equipped with Honeywell S8701A series modules

Why Choose the Honeywell S8701A1122

Honeywell’s S8701 series ignition modules are a proven industry standard in gas appliance ignition control. The S8701A1122 provides the safety, reliability, and ease of installation that HVAC technicians and OEM manufacturers depend on. Its 21-second lockout timing ensures a fast response to ignition failures, minimizing equipment downtime and protecting system integrity.