DIRECT SPARK TIGNITION MODULE. 6 SEC. LOCKOUT. TWO ROD FLAME

S87D1004 DIRECT SPARK TIGNITION MODULE. 6 SEC. LOCKOUT. TWO ROD FLAME S87D1004 Direct Spark Ignition The S87D 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. S87D uses separate electrodes for spark ignition and flame sensing. Use with any gas control designed for OSI application that is rated at 2.0 A or less. Includes optional alarm circuit. Features Control ignition sequence and gas control operation. Generate high voltage potential for main burner ignition. Lockout after one trial for ignition if main burner fails to ignite. Reset from thermostat after lockout. Ignition Trial Time 6 seconds Flame Sense Two Rods Lockout Timing 6 seconds Ignition Trials to lockout 1 The S87 performs the following functions when the thermostat calls for heat: 1. The S87 J and K models provide a 30 second prepurge (delay on start-up). 2. All models check for a false flame condition (short to ground). Module will lock out if false flame condition is present Reset is manually done from the thermostat 3. Generates 30,000 volts (open circuit) at the spark igniter stud for direct ignition of the main burner. 4. Opens the main gas control valve. 5. Senses the presence of main burner flame and discontinues ignition spark. If the burner fails to ignite within the trial-for-ignition period, the S87 goes into safety lockout. Reset is manually done from the thermostat 6. On a loss of power, the S87 allows the system to shut down safely. Start-up is initiated when power is restored. 7. On a loss of main burner flame, the timed trial-for ­ignition is repeated. Safety lockout occurs if flame is not reestablished within the trial-for-ignition period. Reset is manually done from the thermostat