Pool Boiler: Difference between revisions
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== Theory of Operation == | == Theory of Operation == | ||
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 === | |||
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 === | |||
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 === | |||
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 === | |||
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: Main Gas Valve On === | |||
The main gas valve (also referred to as the "main valve" or MV) turns on (becomes active) when the flame sense module (FSM) confirms the presence of the pilot flame. | The main gas valve (also referred to as the "main valve" or MV) turns on (becomes active) when the flame sense module (FSM) confirms the presence of the pilot flame. | ||
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# The boiler temperature controller [[Pool Boiler Temperature Controller#Main Valve Active|main valve active]] input (relay) is energized. | # The boiler temperature controller [[Pool Boiler Temperature Controller#Main Valve Active|main valve active]] input (relay) is energized. | ||
=== Stage E === | |||
Description pending. | Description pending. | ||
== | == Summary of Control Interlocks == | ||
The list below includes interlocks with electrical interfaces only and is intended to align with the CSD-1. This table is for reference only; the CSD-1 should always be considered the master. | The list below includes interlocks with electrical interfaces only and is intended to align with the CSD-1. This table is for reference only; the CSD-1 should always be considered the master. | ||