Robertshaw 780-715 intermittent pilot ignition control provides 24V automatic sequencing with flame rectification and solid-state logic. When the thermostat calls for heat, it opens the pilot valve and starts sparking, then opens the main valve once the pilot flame is proved.
Monitoring continues for the full heating cycle at synchronous frequency. If the pilot fails, the main valve closes until the pilot is re-established. It sparks 3 to 4 times per second for 90 seconds, with a six-minute delay between attempts.
780-715 highlights
Flame rectification monitoring
Sensing stops sparking on pilot proof and guards the main valve through the cycle.
90-second spark with retry delay
Timed sparking plus a six-minute purge spaces ignition attempts.
1 Amp valve draw
Pilot and main draw stays within controlled power-factor limits.
780-715 specifications
Use: Furnaces, water heaters, burners, boilers
Voltage: 24V AC, 50/60 Hz
Humidity: 95% relative humidity noncondensing at 104°F
Valve load: 1 Amp pilot and main at 0.5 power factor, 1.5 Amps combined at 0.4 power factor
Retry delay: 6 minutes between attempts
Ignition type: Intermittent pilot, 3 to 4 sparks per second for 90 seconds
