Backwashing: 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. <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> | # 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 | # Stop the [[Pool Main Pump Motor|main pump motor]] by pressing the <b>Stop</b> button on the motor starter. | ||
NOTE: These steps are identical to the first three followed when [[Cleaning the Strainer Basket#Preparation|cleaning the strainer basket]]. | NOTE: These steps are nearly identical to the first three followed when [[Cleaning the Strainer Basket#Preparation|cleaning the strainer basket]]. | ||
=== Set | === Set Valves to Backwash === | ||
# Open Valve #1 | # Open Valve #1 | ||
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# Open Valve #3 | # Open Valve #3 | ||
# Close Valve #4 | # Close Valve #4 | ||
NOTE: Improved marking and documentation of these valves and positions to follow. | |||
=== Backwash === | |||
# Start the [[Pool Main Pump Motor|main pump motor]] by pressing the <b>Start</b> button on the motor starter. | |||
# Verify flow is present at the outflow pipe on the north side of the pump house. | |||
# Operate until the water flows clear or 10 minutes has elapsed, which ever occurs first. An excessively long backwash is not recommended as it may result in flushing filter sand into the sanitary sewer. | |||
The [[Pool Systems Automation#Stack Light|stack light]] indicator should flash an alternating red-green pattern while backwash is active. | |||
Do not turn on pool fill during backwash. It is desired to send as much pool water (versus fresh/city water) to the sanitary sewer as possible. | |||