Pool Boiler: Difference between revisions

Jump to navigation Jump to search

Pool Boiler (view source)

Revision as of 18:43, 4 January 2022

No change in size ,  4 years ago
no edit summary
VisualWikitext
No edit summary
Line 57: Line 57:


=== High Temperature Fault ===
=== High Temperature Fault ===
== Known Issues ==
The following issues are known as of September 2021.
=== 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.  This is fixed by reconnecting the control transformer to terminal 3 (as suggested above).


== Theory of Operation ==
== Theory of Operation ==
Line 226: Line 206:
* Relay coil taps were added to add monitoring of operating conditions by an external PLC.  These connections are documented in the pool systems automation [[:File:FFSC-001_Pg_40_-_Boiler_Auxiliary.png|Boiler Auxiliary]] drawing.
* Relay coil taps were added to add monitoring of operating conditions by an external PLC.  These connections are documented in the pool systems automation [[:File:FFSC-001_Pg_40_-_Boiler_Auxiliary.png|Boiler Auxiliary]] drawing.
* Re-routing of some electrical in new liquid-tight conduit.
* Re-routing of some electrical in new liquid-tight conduit.
== Known Issues ==
The following issues are known as of September 2021.
=== 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.  This is fixed by reconnecting the control transformer to terminal 3 (as suggested above).
Retrieved from "https://wiki.fairwayfarmsswimclub.com/Special:MobileDiff/1328"

Navigation menu