Pool Boiler: Difference between revisions
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Matt Parnell (talk | contribs) (Created page with "The boiler is a natural gas fired 1,200,000 BTW/hr RBI LW1200. Details are contained in RBI drawing #42-2112 (not published on the Wiki as it may be considered RBI proprietar...") |
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Interlocks prevent the boiler from operating when the water level is too low, sufficient water flow is not present or the air pressure differential (as generated by the blower motors) is insufficient. Redundant over-temperature lock-outs (including those added by FFSC maintenance) prevent operation in the event that the temperature rises beyond a threshold. | Interlocks prevent the boiler from operating when the water level is too low, sufficient water flow is not present or the air pressure differential (as generated by the blower motors) is insufficient. Redundant over-temperature lock-outs (including those added by FFSC maintenance) prevent operation in the event that the temperature rises beyond a threshold. | ||
== Operation == | |||
The operation sequence below is based upon the procedure described in the LCD Series manual, with adaptations per the installation wiring. | |||
=== Stage A: Demand for Heat === | |||
A demand for heat is satisfied when all of the following conditions are met: | |||
# The measured temperature (via the temperature controller) has reached or fallen below the heat threshold. | |||
# The normally closed (NC) <b>Boiler Disable</b> relay contact (part of the pool automation system) is closed, indicating that no fault is observed. | |||
# The <b>Low Operator</b> relay contact (in the Johnson Controls C450CCN-3 module) is closed, indicating that the over-temperature bound has not been met. | |||
At this point: | |||
# The boiler time-delay relay TD4 is engaged, which energizes contactor C1. This turns on the boiler loop circulation pump. | |||
# The automation system relay CR2110 is energized, which activates PLC input X10. | |||
=== Stage B: Flow/Temperature Interlocks === | |||
The following interlocks must be satisfied to proceed: | |||
# The <b>High Temp</b> latch is not set (in the Honeywell L4006E, with a reset pushbutton located on the front side of the boiler). | |||
# The <b>Water Flow<b> switch is tripped, indicating that sufficient flow in the loop is present. | |||
At this point: | |||
# The boiler time-delay relay TD3 is engaged. | |||
# The automation system relay CR2111 is energized, which activates PLC input X11. | |||
== Maintenance == | == Maintenance == | ||