Pool Boiler: Difference between revisions
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→Theory of Operation
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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: 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. | |||
Once this has occurred: | |||
# Relay R8 is energized to disable the spark generator transformer. | |||
# The MAIN GAS indicator on the boiler is illuminated. | |||
# The automation system relay CR2113 is energized, which activates [[Pool Systems Automation#Digital Inputs|PLC input X13]]. | |||
# The relay in the [[Pool Temperature Controller|pool temperature controller] is energized, which provides confirmation that a request for heat has been satisfied. | |||
# The boiler temperature controller [[Pool Boiler Temperature Controller#Main Valve Active|main valve active]] input (relay) is energized. | |||
==== Stage E ==== | ==== Stage E ==== | ||