Backwashing: Difference between revisions
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# Verify flow is present at the outflow pipe on the north side of the pump house. | # 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. | # 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. | ||
# Stop the [[Pool Main Pump Motor|main pump motor]] by pressing the <b>Stop</b> button on the motor starter. | |||
The [[Pool Systems Automation#Stack Light|stack light]] indicator should flash an alternating red-green pattern while backwash is active. | 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. | 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. | ||
=== Set Valves to Normal Operation === | |||
The pump must be stopped prior to adjusting the valve positions. | |||
# Close Valve #1 | |||
# Open Valve #2 | |||
# Close Valve #3 | |||
# Open Valve #4 | |||
=== Start Normal Operation === | |||
# Start the [[Pool Main Pump Motor|main pump motor]] by pressing the <b>Start</b> button on the motor starter. | |||
# Return the temperature controller setpoint to the nominal value (i.e. 82 °F) if adjusted earlier. | |||
# 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. | |||