Backwashing: Difference between revisions
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Backwashing also dumps a tremendous amount of water into the sanitary sewer, often leading to a necessary fill post-backwash. Reducing the frequency of backwashing (to only when it's deemed necessary versus on a too-frequent interval) conserves water and can improve overall water clarity. | Backwashing also dumps a tremendous amount of water into the sanitary sewer, often leading to a necessary fill post-backwash. Reducing the frequency of backwashing (to only when it's deemed necessary versus on a too-frequent interval) conserves water and can improve overall water clarity. | ||
== | == Procedure == | ||
=== Preparation === | |||
# 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. <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). | |||
NOTE: These steps are identical to the first three followed when [[Cleaning the Strainer Basket#Preparation|cleaning the strainer basket]]. | |||
=== Set Valve Positions === | |||
# Open Valve #1 | |||
# Close Valve #2 | |||
# Open Valve #3 | |||
# Close Valve #4 | |||