Hi, I'm Vance and welcome to Repair and Replace. In this episode we're going to troubleshoot some of the most common problems in a
Delta Tech II center flushometer. This applies to both urinals and water closets as the models are nearly identical
except for the spud diameter and size. 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. Continuous flushing can happen when the
upper chamber does not fill with water. Either the bypass isn't letting in enough
water or the solenoid isn't closing. Another cause can be the diaphragm. If it's stuck open, then the water will
continue to flow during a flush. Open the bypass by turning the regulating screw counterclockwise and check for buildup of debris or sediment which might be clogging the bypass. You can watch the video linked below
to see this in detail. Both the solenoid and diaphragm can be
easily replaced if damaged or stuck. You can watch these in the videos linked below. If there's an excessive amount of water coming out during each flush, then
first check the inlet stop. Close the inlet stop valve all the
way, then open it one complete turn. Check the position of the regulating screw
and make sure that there are no obstructions. If there is not enough water to properly
flush the bowl then, first check the inlet stop. Open the inlet stop fully and
check the operation.
Check the pipes for any obstruction
or corrosion. Water flow rate is dependent on the pressure. So, the pipe size, length and the number of fixtures in the building can all affect
the flow rate of each flush. If there are no lights and no power check
to see if the four AA batteries are positioned correctly in the holder. Check the positive and negative signs
for the right position. If the position is correct but there is
still no power, then replace the batteries. You can watch this in the video linked below. When the unit has power and the lights are showing but, the valve doesn't flush check
to see if the solenoid makes a clicking sound.
If there is no sound then replace
the cast cap solenoid assembly. You can watch this in the video linked below. If you found this video useful,
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