Cleaning the Strainer Basket: Difference between revisions
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# Disable the call for heat by lowering the temperature setpoint on the temperature controller to a value several degrees below the sensed temperature (in the future, a switch may be added to do this). | # Disable the call for heat by lowering the temperature setpoint on the temperature controller to a value several degrees below the sensed temperature (in the future, a switch may be added to do this). | ||
# If the boiler was operating in Step #1, wait for the boiler circulation pump to stop. This may take several minutes. Observe that during this period, the manifold temperature will drop, approaching the boiler inlet (sensed) temperature. It is important to allow the boiler to complete a proper cool-down prior to cutting water circulation. Failure to do so could result in an over-temperature trip, or damage to the boiler itself. | # If the boiler was operating in Step #1, wait for the boiler circulation pump to stop. This may take several minutes. Observe that during this period, the manifold temperature will drop, approaching the boiler inlet (sensed) temperature. <b>It is important to allow the boiler to complete a proper cool-down prior to cutting water circulation. Failure to do so could result in an over-temperature trip, or damage to the boiler itself.</b> | ||
# Stop the main pump motor. Switching off the disconnect (the lever on the enclosure above the motor starter) may be necessary in some cases (see below). | # Stop the main pump motor. Switching off the disconnect (the lever on the enclosure above the motor starter) may be necessary in some cases (see below). | ||
# Close the water valves on both sides of the strainer basket. If water overflows, additional closing force may be required (the valves should form a complete seal). | # Close the water valves on both sides of the strainer basket. If water overflows, additional closing force may be required (the valves should form a complete seal). | ||
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# Return the temperature controller setpoint to the nominal value (i.e. 82 °F). | # Return the temperature controller setpoint to the nominal value (i.e. 82 °F). | ||
# Bleed air from the filter tanks after several minutes of operation. | # Bleed air from the filter tanks after several minutes of operation. | ||
# Adjust the output flow of the pump to be within 600 to 650 GPM. The flow rate must exceed the required minimum (570 GPM with some margin) but not grossly exceed the combined maximum flow rate of the sand filters (560 GPM). Note that 560 GPM is not a typo; refer to [[Sand Filters]] for discussion on this discrepancy. | |||
Observe the water in the strainer some period of time after the pump has resumed operation. The water level should be near the top, with minimal turbulence. If there is a significant amount of turbulence, air is likely being pulled in through the seal and entering the system. The screws must be further tightened. Otherwise, operation of the boiler and sensor probes may be negatively affected. | Observe the water in the strainer some period of time after the pump has resumed operation. The water level should be near the top, with minimal turbulence. If there is a significant amount of turbulence, air is likely being pulled in through the seal and entering the system. The screws must be further tightened. Otherwise, operation of the boiler and sensor probes may be negatively affected. | ||
== Other Considerations === | |||
During the cleaning process, the Chemtrol sensor probes may no longer be in contact with water. If possible, shut off the bypass line outflow valve prior to stopping the main pump motor. This will keep the sensors submerged. Otherwise, be sure to minimize the amount of time the sensors are out of water, as they may be damaged if allowed to dry out. | During the cleaning process, the Chemtrol sensor probes may no longer be in contact with water. If possible, shut off the bypass line outflow valve prior to stopping the main pump motor. This will keep the sensors submerged. Otherwise, be sure to minimize the amount of time the sensors are out of water, as they may be damaged if allowed to dry out. | ||
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Please keep the lower level (gallery) clean! Avoid leaving debris on the floor or in buckets. Periodic vacuuming is encouraged. Avoid allowing significant debris to enter the drain, as it may clog the pipe. | Please keep the lower level (gallery) clean! Avoid leaving debris on the floor or in buckets. Periodic vacuuming is encouraged. Avoid allowing significant debris to enter the drain, as it may clog the pipe. | ||
To start or stop the pump, press the black START or red STOP button on the [[Pump Motor Starter]]. | |||