Pool Boiler: Difference between revisions
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→Theory of Operation
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== Theory of Operation == | == Theory of Operation == | ||
=== Operation Sequence === | |||
The operation sequence below is based upon the procedure described in the LCD Series manual, with adaptations per the installation wiring. | The operation sequence below is based upon the procedure described in the LCD Series manual, with adaptations per the installation wiring. | ||
=== Stage 0: Water Level OK === | ==== Stage 0: Water Level OK ==== | ||
The low-water cut-out disconnects power from the 75 VA control transformer in the boiler. This prevents boiler operation when a low water situation is encountered. | The low-water cut-out disconnects power from the 75 VA control transformer in the boiler. This prevents boiler operation when a low water situation is encountered. | ||
=== Stage A: Demand for Heat === | ==== Stage A: Demand for Heat ==== | ||
A demand for heat occurs when all of the following conditions are met: | A demand for heat occurs when all of the following conditions are met: | ||
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# The automation system relay CR2110 is energized, which activates [[Pool Systems Automation#Digital Inputs|PLC input X10]]. | # The automation system relay CR2110 is energized, which activates [[Pool Systems Automation#Digital Inputs|PLC input X10]]. | ||
=== Stage B: Temperature and Water Flow OK === | ==== Stage B: Temperature and Water Flow OK ==== | ||
The temperature and water flow are deemed OK when: | The temperature and water flow are deemed OK when: | ||
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# The automation system relay CR2111 is energized, which activates [[Pool Systems Automation#Digital Inputs|PLC input X11]]. | # The automation system relay CR2111 is energized, which activates [[Pool Systems Automation#Digital Inputs|PLC input X11]]. | ||
=== Stage C: Low Air Pressure OK === | ==== Stage C: Low Air Pressure OK ==== | ||
The low air pressure switch closes in response to sufficient positive pressure in the combustion chamber. | The low air pressure switch closes in response to sufficient positive pressure in the combustion chamber. | ||
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NOTE: Flame fail/lockout is not considered here. The present flame sense module (FSM), or "intermittent pilot ignition" module, does not include alarm contacts (UTEC 1003-638A). The specified module, a UTEC 1003-61A is unavailable on the market at this time. The alarm contacts are required to engage R1, the flame fail/lockout relay. This is problematic, as it would allow the ignition transformer to spark indefinitely, eventually resulting in component failure. As a work-around, the automation system provides a monitored lockout function via the <b>Boiler Disable</b> relay. | NOTE: Flame fail/lockout is not considered here. The present flame sense module (FSM), or "intermittent pilot ignition" module, does not include alarm contacts (UTEC 1003-638A). The specified module, a UTEC 1003-61A is unavailable on the market at this time. The alarm contacts are required to engage R1, the flame fail/lockout relay. This is problematic, as it would allow the ignition transformer to spark indefinitely, eventually resulting in component failure. As a work-around, the automation system provides a monitored lockout function via the <b>Boiler Disable</b> relay. | ||
=== Stage D === | ==== Stage D ==== | ||
Description pending. | Description pending. | ||
=== Stage E === | ==== Stage E ==== | ||
Description pending. | Description pending. | ||