CIRCUIT BOARD FUNCTIONS
START-UP SEQUENCE OF EVENTS
Once the control panel is turned to on, a timer begins that will start, stop and continue operation of the Hearth
Focus as a preset temperature is achieved.
COMPONENT | OPERATION START | OPERATION END |
Exhaust Blower | Starts Immediately | Will continue until shutdown. Shutdown will |
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| occur when the operating temperature is |
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| below 90 degrees. |
Agitator | Three minutes after starting the agitator will | Will continue intermediately, has determined |
| begin to turn | by the “HEAT SETTING”, until shutdown |
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Auger | Three minutes after starting the auger will | The auger will continue at the feed rate |
| begin to turn | specified by the “HEAT SETTING”. |
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| NOTE: Safety switches, HI limit and vacuum |
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| sensor, must be activated to continue proper |
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| operation. |
Room Fan | Begins when 110 degrees is reached. | Will continue to operate until the heater cools |
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| down to below 90 degrees. This may take |
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| several minutes up to an hour. |
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Automatic Shutdown | If after 15 minutes, the heater has not reached | Should the timer expire before the preset |
| the preset operating temperature, the unit will | operating temperature is achieved, simply |
| begin to automatically shut down. | reset the stove by pressing the “ON” buttton. |
Normal Operation | If after 15 minutes the preset operating tem- | Operation will continue until either the |
| perature of 110 degrees is achieved, normal | heater’s control is to the “OFF” position, or |
| operation will continue. | the operating temperature falls below 90 |
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| degrees. At such time the heater will default |
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| to the “Automatic Shut Down”. |
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SHUTDOWN SEQUENCE OF EVENTS
Once the Hearth Focus has reached the normal operating temperature and switched to the “OFF” position, the unit will continue to operate on a much lower setting for 10 minutes. (Approximately half of the “1” setting). After 10 minutes the auger will slow down further and continue at this feed rate until the heater’s “LOW LIMIT SAFTEY” sensor tells the control board it is safe to shutdown.
COMPONENT | SHUTDOWN | OPERATION END |
Exhaust Blower | Unchanged operation until preset “OFF” tem- | Continues until the operating temperature falls |
| perature is achieved. | below 90 degrees. May take several minutes |
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| up to an hour. |
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Agitator | Continues at a lower sequence | Continues until the operating temperature falls |
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| below 90 degrees. |
Auger | Slows down to a “HALF SETTING” for 10 | The auger will continue at the lower feed |
| minutes and then to a “QUARTER SETTING” | rates until the operating temperature falls |
| for the duration of the shutdown. | below 90 degrees. |
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| NOTE: Safety switches, HI limit and vacuum |
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| sensor, must be activated to continue |
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| proper operation. |
Room Fan | Unchanged operation until preset “OFF” tem- | Will continue to operate until the heater cools |
| perature is achieved. | down to below 90 degrees. This may take |
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| several minutes up to an hour. |
Automatic Shutdown | If the heater’s “HI LIMIT” sensor snaps open, | It is rare that the HI LIMIT temperature is |
| this will cause an automatic shutdown. This | reached. However, should this error occur, |
| will be evident by the red light above “B” on | let the heater cool down for an hour then |
| the control board flashing. NOTE: “HI LIMIT” | restart. |
| errors are usually the result of operating at |
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| the highest heat setting for long periods of |
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| time, room fan failure or loose wire connec- |
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| tion. |
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USSC | 17 |
