Installation SN2013/AST4, SN2013/AST4-F, SN2033/AST4
Bradley • 215-784 Rev. Q: ECO 20-00-015 8/24/2020 9
Turn off water supplies to the unit before troubleshooting.
Problem Cause Solution
Valve will not shut off. Timing mechanism
is clogged. 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.
One or more individual
operating stations fail
to turn on.
Water is not being
supplied to unit. Open all stops on mixing valve.
Water pressure is
over 80 PSI. Install a pressure reducing valve.
Failed diaphragm/
magnet assembly. Unscrew the valve clamp nut on valve. Remove valve cover. Gently press the diaphragm. The
valve should activate. If not, replace the diaphragm/magnet assembly.
One or more individual
operating stations turn
off too quickly or run
too long,
There is an air leak. Check the valve assembly:
1. Check all tubing and fittings for proper assembly.
2. Tighten cap and nut on 1/8" tubing.
Pushbutton does not
work properly. Air volume may
not be sufficient to
operate valve.
Check for leaks and lubricate U-cup:
1. Check all fittings for air leaks.
2. Disassemble pushbutton and lubricate U-cup seal (see pushbutton assembly diagram on next
page).
Water is dripping from
the streamformers. Debris has
accumulated
on valve seat or
orifices.
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.
Item Qty. Description
1 1 Diaphragm
2 1 Armature
3 1 Spring
4 1 AST 4 Valve Upper Body
5 1 Magnet/Diaphragm Assembly
6 1 AST 4 Valve Cover
7 1 AST 4 Valve Clamp Nut
8 1 AST 4 Valve Timer Assembly
9 2 O-Ring
10 1 AST 4 Valve Timer Cover
11 1 Compression Nut, 1/8" Tube
12 3 Screw, #8 x 7/8"
13 1 Compression Nut, 1/4" Tube
14 1 Tube Connector 10-32 x 1/8"
7
6
5
9
2
3
11
1
13
14
4
12
10
8
9
AST4-Hand Valve Only
AST4-F Foot Valve Only
AST4-Hand Valve, AST4-F Foot Valve
Troubleshooting Air Valves (AST4, AST4-F)
