Sentry
™
Washfountain
Parts and Service Guide
28
Bradley Corporation • 215-1472 Rev. F; EN 06-915
2/12/07
Troubleshooting Air Valve Hold-Open Foot Control (AST4-F)
Problem: One or more individual operating stations fail to turn on.
Cause:
Incoming water pressure is over 80 PSIG.
Solution: Reduce water pressure to below 80 PSIG.
Install a pressure-reducing valve at the building main set to the manufacturer's recommendations.
Lower line pressure will improve the performance and extend the life of all the plumbing in the build-
ing.
Problem:
An individual operating station turns off while the foot button is depressed.
Cause:
Air tube connection leak.
Solution:
Check 1/8" tubing connection.
1. Tighten compression nut at 1/8" tubing connection to air valve in pedestal.
2. If leak persists, remove the two screws securing the foot button escutcheon and check the 1/8"
elbow tube connection behind the pushbutton assembly. Make sure the screw holding the elbow
is tight and the fitting in the elbow is firmly hand tightened. Make sure the tubing is pushed
firmly into the fitting.
3. If leak persists, reseat the 1/8" tubing. Disconnect the tubing from the fitting by pressing down
on the plastic ring at the top of the fitting while firmly pulling the tubing out of the fitting. Trim
½" off the end of the tubing squarely with a razor-sharp knife and push the tubing firmly back
into the connector to make it is seated.
4. If the leak still persists, loosen the compression nut on the air valve inside the pedestal and pull
the tubing out of the fitting. Trim ½" off the end of the tubing squarely, with a razor-sharp knife.
Then slide the tubing through the nut until ½" of tubing is exposed. Insert tubing into the com-
pression fitting on the valve body and hand tighten the compression nut.
Problem:
An individual operating station fails to turn on.
Cause:
A failed diaphragm/magnet assembly.
Solution:
Test the station to determine cause.
1. Unscrew the valve clamp nut on the top of the valve. (See Page 25).
2. Remove valve cover. If the diaphragm/magnet assembly comes out with the cover, gently peel
the diaphragm away form the cover, taking care not to damage the diaphragm. Inspect the
diaphragm for any holes of tears. A damaged diaphragm needs to be replaced.
3. Insert the diaphragm/magnet assembly back into the valve, but leave the cover off.
4. Gently press the diaphragm until it is fully depressed. The valve should activate. If not, the
diaphragm/magnet assembly needs to be replaced.
