Hi, I'm Vance and welcome to Repair and Replace.
In this episode we're going to replace
the regulating screw in a Delta Tech II sensor flushometer.
This applies to both urinals and water closets
as the models are nearly identical except for the spud diameter and size.
To begin, you'll need a regulating screw, a
flat blade screwdriver, a Phillips screwdriver,
needlenose pliers, a pipe cleaner and an eight
point star bit or number three Robertson screwdriver.
Flushometers are also known as flush valves
but function quite differently from the flush valves found in residential toilets.
In a Delta Tech II, a flexible rubber diaphragm sits between the upper and lower chambers.
At rest, high pressure water in the
upper chamber keeps the diaphragm closed tightly on the valve seat.
When the sensor is activated, the
solenoid valve opens and releases water from the upper chamber.
This creates a vacuum which lifts the diaphragm up from the valve seat.
The water from the inlet then travels down the flush pipe.
As the water flows, some of the water
slowly travels through the bypass and will eventually fill the upper chamber.
The flush will continue until the pressure pushes the diaphragm down once again.
Over time the regulating screw can build up with debris.
This blockage will prevent water from
filling the upper chamber and can cause continuous flushing.
First, shut off the water to the flushometer.
Remove the cap and use a flat blade
screwdriver to turn the screw clockwise until the inlet stop closes.
Next, press the manual override button to help drain the remaining water.
Remove the cover screws using an eight
point star bit or a number three Robertson screwdriver.
Now, remove the cover.
Take off the plastic cap and remove the button.
Now, disconnect the sensor wires from the solenoid.
Slide the sensor housing up and over the solenoid and set aside.
Use a Phillips screwdriver to unscrew and remove the cast cap.
Use a flat blade screwdriver to loosen the regulating screw.
Since the screw has an o-ring it will
start spinning in the hole so, you'll need pliers to completely pull the screw out.
Now, make sure that the screw hole is clean and not obstructed by any debris or sediment.
Seat the new regulating screw and tighten
it until it's flush with he bottom of the cast cap.
Now, place the cast cap over top with the regulating screw on the same side as the inlet.
Next, tighten the mounting screws.
Now, place the cover gasket on top.
Slide the sensor housing over top of the solenoid and align the screw holes.
Reconnect the wires to the solenoid by matching the color of each wire.
Now, tuck the wires neatly inside the housing.
Next, replace the button and the plastic cap.
Replace the cover and tighten the cover screws.
Open the shut-off valve and replace the cap.
Finally, test the flushometer and check for any leaks.
The first flush will remove all the air from the system.
The second flush should function as normal.
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