Controls inducer motors, air cleaner (if equipped), humidifier (if equipped), spark ignitor and the gas valve
Monitors timing, trial for ignition, system switches, flame sensing and lockout
100% lockout safety feature
Compatible with LP or natural gas
LED indication for status and fault codes to aid in troubleshooting
2-1/2 in H
Timing: Pre-purge - 30 sec, trial for ignition - 7 sec, retries - two groups of two, 30 sec delay within the group and 3 min delay between groups, lockout - 1 hr, post-purge - 90, 120, 160 and 180 sec
Inputs: Power - 24 VAC and COM, thermostat interface - R,W, Y, and G, system switches - vent pressure and limit switches (main and over-temperature switches in series), flame sensing, heat blower OFF delay (miniature slide switch set)
Output: Heat/cool speed, NO - 20 A at 240 VAC, NC - 10 A at 240 VAC
LED Indicators: Power, Green LED: PWR/ Status, Green LED: OK/ Flame status, Yellow LED: FLAME
Patents - No 6222719: Ignition boost, No 5917691: fail safe relay driver