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The drain pump can pump up to 21 gallons per
minute (GPM). Normal sink drains allow only 5 to
6 GPM to flow. Adjust the discharge shut-off/flow
balancing valve as follows so that the pump does
not cycle on and off when the faucets are on full.
• Run water into the sink. The pump will start
when it detects water.
• Check for leaks. IF leaks are found, unplug
the pump power cord and fix the leaks before
proceeding.
• Put a stopper in the drain and allow the sink to
fill up a few inches.
• Open the discharge shut-off valve, open the
faucets, and remove the stopper to drain the
sink.
• The pump will start. Adjust the discharge shut-
off/flow balancing valve until the pump runs
continuously while the faucets are running and
the sink is draining. If the water level rises with
the pump on, slightly open the discharge valve
to balance the flow. If it drops, slightly close the
discharge valve.
Washing machines usually discharge more
water than the faucets do, and it is normal for the
water level to rise in the sink while the pump is
discharging. Do not adjust the discharge valve
to match the flow when the washing machine
discharges into it, unless the sink is ONLY used for
washing machine discharge.
Discharge Pipe
Laundry
Sink
Screen
Check Valve
1-1/2” PVC
Pump
Shut-Off/Flow-
Balancing Valve
1-1/4” Union Half
1-1/4” Union
Half
ADJUSTING THE FLOW
