50 Seconds Ignition Control Gas Valve Module 100% Lock-out (Direct Factory Replacement Part) (Johnso
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G600 controls When the G600 is used to replace an original control, the system sequence of operation does not change.
Following is the sequence of operation for all G600s:
1. Call for Heat: The thermostat contacts close, powering Terminal 2 on the G600.
2. Pilot Flame Checking: If the G600 detects the presence of pilot flame (from the flame sensor) when there should not be (i.e., before the call for heat), the G600 will not operate.
3. Vent Damper Actuation: On models electrically interlinked with a vent damper, the G600 powers the vent damper motor. Once the vent damper reaches its open position, the motor stops, and the G600 is allowed to begin the prepurge (prepurge models only) or trial for ignition.
4. Prepurge: The appliance prepurge fan or relay is energized through the thermostat contacts. The control delays for the 4-second prepurge before simultaneously opening the pilot valve and supplying a continual spark at the pilot burner (models with prepurge only).
5. Trial for Ignition: During the trial for ignition, the G600 energizes Terminal 1 and the spark transformer, which opens the pilot valve and activates the spark in an attempt to light the pilot burner. If the G600 detects the presence of the pilot flame within the trial-for-ignition time, it proceeds to the run state. If the G600 does not detect the presence of the pilot flame within the trial-for-ignition time, it de-energizes all outputs (locks out) and remains in this condition until the thermostat is recycled. The G600AX and G600AY have infinite trials for ignition and spark indefinitely.
6. Run: If pilot flame is detected within the trial for ignition, Terminal 3 is energized and the spark transformer is de-energized, which opens the main valve and shuts off the spark. The pilot valve and main valve are kept open throughout the run state. The control remains in the run condition until the call for heat ends or until a flameout occurs.
7. Flameout: If, during the run state, the control detects the loss of pilot flame, it de-energizes the main valve within 0.8 second (flame failure response time). The pilot valve is kept open, the spark is re-established, and another trial for ignition begins.
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