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9 Cards in this Set
- Front
- Back
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1. A call for heat is established 2. ? |
2. The tstat senses a drop in room temp. And closes the R-W terminals |
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2. T-stat senses a drop in room temp. And closes R-W terminals 3. ? |
3. Sends 24 volt ac power to a relay that starts and induced fan |
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3. R-W terminals close, which sends 24 volt power to a relay that starts the induced fan. 4. ? |
4. Once induced fan is up to speed, a pressure switch ( sensing the air pressure in response to the fan) closes its contacts which allows power to flow to the ignition module |
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4. A pressure switch closes its contacts and allows power to flow to ignition module 5. ? |
5. Once module is powered, it does a safe-start check to prove there is no false flame signal |
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5. Once module is powered, it does a safe-start check to prove there is no false flame signal 6. ? |
6. Off app is proved to be off, the module initiates ignition sequence, if app was on it is shut down |
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6. Upon successful completion of the safe-start check, the module initiates the ignition sequence 7. ? |
7. The module closes switches that simultaneously energize the pilot gas valve and the spark generator, and flame sensor |
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7. Pilot gas valve, spark generator and flame sensor circuit are powered 8. ? |
8. Pilot lights |
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8. Pilot lights 9. ? |
9. The sensor circuit senses the flame and turns spark generator circuit off |
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9. Once flame is proven, the spark generator circuit is turned off 10. ? |
10. If flame sensor senses pilot flame, the module firing the main burner will energize the main gas valve, if the flame goes out system will be shut down |
