Pool Boiler: Difference between revisions
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=== 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. | |||
=== Stage A: Demand for Heat === | === Stage A: Demand for Heat === | ||
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Two copies of the CSD-1 should be kept by FFSC. One placed in a room near the boiler, another in a central filing location. | Two copies of the CSD-1 should be kept by FFSC. One placed in a room near the boiler, another in a central filing location. | ||
== Known Issues == | |||
=== Low-Water Cut-Off === | |||
The implementation of the low-water cut-off (LWCO) could potentially be improved. In the present design (as found in 2020, where the control transformer is cut off): | |||
* The pump could theoretically continue to operate following a low-water trip per time delay relay TD4. | |||
* The loss of control power prevents detection of a low-water condition by the PLC; the PLC does not even "see" a demand for heat when the cut-off is tripped. | |||
Options to consider: | |||
* The T7CS5D-24 relay in the LWCO is rated for a 12 A load at 120 VAC. Move T1 (C1 pin #4) from terminal 1 to the output of the LWCO. This would serve to immediately disconnect the pump upon low-water trip. | |||
* Reconnect the control transformer to terminal 3 (per RBI drawings). Disconnect the LWCO relay contacts and remove the factory jumper from H to C (to confirm). Insert the LWCO contact between terminals 17 and 18 in the boiler (remove jumper "F" per RBI drawings). | |||
=== Power Switch === | |||
The power switch does not disconnect the control transformer. | |||
== Troubleshooting == | == Troubleshooting == | ||