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Below is the heating sequence of you unit for the heating cycle. If you will read #8 you will see that you should hear some sparking when you turn the thermostat to heat and turn the target tenpature above the room tempature. This sparking should go on for a few seconds to a minute or so, then you should see a pilot flame. After the pilot lights it then should be another minute or so and the burners will light. So listen and look for the spark, if you hear the spark but it never lights the pilot I would then like for you to use a fireplace match or a bar-b-que lighter and try to light the pilot where the spark is sparking. If the pilot lights that means the spark is not arcing where the gas is coming out of the pilot. So try to clean this area, it could be covered with dust or corrision. Let me know what happens. Heating: 5−Heating demand initiates at W1 in the thermostat and energizes Relay K13. Heating demand also passes through High temperature limit S10 to combustion air prove Switch S18. 6−Relay K13 closes to energize combustion air blower B6. When the combustion air blower nears full speed, prove Switch S18 closes. Heating demand continues through S18 and through flame rollout switch S47 to energize Ignition control A3. 7−Ignition control A3 then waits 30 to 40 seconds to allow Combustion air blower B6 time to draw exhaust gas from Combustion chamber and to introduce fresh air. Combustion Air blower B6 operates throughout the heating Cycle. 8−After the ignition control delay, A3 activates gas valve GV1 and the spark electrode. When flame is sensed by The flame sensor ,the spark electrode stops. If flame is Not sensed after the first trial for ignition, controller A3 repeats Steps 7 and 8 up to two more times (depending on Controller make) before locking out. If the control locks Out, it can be reset by breaking and remaking thermostat Demand. 9− Blower delay relay K25 de−energizes blower B3 after 150 second delay. |
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