MF2904/AST4
Installation
14
2/1/07
Bradley Corporation • 215-576 Rev. X; EN 06-915-C
Metering Air Valve Troubleshooting
Problem: Valve will not shut off.
Cause: Timing mechanism is clogged.
Solution: Clean and inspect timing mechanism:
1. If compressed air is available, blow water and debris from timer cover of timing mechanism.
2. Turn adjusting screw out all the way. Clean and inspect screw and valve body.
3. Turn adjusting screw in to desired cycle time.
Problem: Valve will not turn on.
Cause: Water is not being supplied to unit.
Solution: Open all stops on mixing valve.
Cause: Water pressure is over 80 PSI.
Solution: Install a pressure reducing valve.
Cause: Failed diaphragm/magnet assembly.
Solution: Unscrew the valve clamp nut on valve. Remove valve cover. Gently press the the
diaphragm. The valve should activate. If not, replace the diaphragm/magnet assembly.
Problem: Timing can not be adjusted for more than 5 seconds.
Cause: There is an air leak
Solution: Check the valve assembly:
1. Check all tubing and fittings for proper assembly.
2. Tighten cap and nut on 1/8" tubing.
Problem: Push button does not work properly.
Cause: Air volume may not be sufficient to operate valve.
Solution: Check for leaks and lubricate U-cup:
1. Check all fittings for air leaks.
Problem: Water is dripping from the streamformers.
Cause: Debris has accumulated on valve seat or orifices.
Solution: Clean and inspect valve seat.
1. Remove screws and disassemble metering valve.
2. Clean valve seat and inspect for deep gouges or scratches. Replace valve body if necessary.
3. Remove any debris clogging off-center hole in rubber diaphragm.
