Honeywell S87D1020 Dual Rod Direct Spark Ignition Control 4-Second Trial and Lockout

The S87 is a low voltage solid state direct spark ignition control module for gas-fired furnaces boilers and heating appliances. Models are available with or without a prepurge timer. The S87 controls the gas valve monitors the main burner flame and generates a high voltage for spark ignition. The S87D uses a separate electrodes for spark ignition and flame sensing. Use with any gas control designed for DSI application that is rated at 2.0A or less.

The S87D1020 is a 24V unit for Natural Gas or Liquid Propane and has an 0.8 second flame failure, 0.8 second re-ignition, 4 second trial, 1 trial to lockout, no pre-purge.
It also includes alarm terminal, and internal high voltage spark generator

Features:

• External replaceable fuse protects system transformer and temperature controller
• Automatic system lockout after trial-for-ignition if malfunction exists or main burner flame fails to ignite
• Compact solid state components for accurate long-lasting performance
• Convenient remote start procedure after safety shutdown control module can be reset from the remperature controller
• Low voltage control circuit reduces wiring costs
• Uses flame rectification principle to prove presence of main burner flame false flame signal resulting from short to ground results in safety shutdown