Troubleshooting - Bradley SN2013/AST4 Manual Del Usuario

Installation
Troubleshooting Air Valves (AST4, AST4-F)
Turn off water supplies to the unit before troubleshooting.
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"
Problem Cause
Valve will not shut off. Timing mechanism
is clogged.
One or more individual Water is not being
operating stations fail supplied to unit.
to turn on.
Water pressure is
over 80 PSI.
Failed diaphragm/
magnet assembly.
One or more individual There is an air leak.
operating stations turn
off too quickly or run
too long,
Pushbutton does not Air volume may
work properly. not be sufficient to
operate valve.
Water is dripping from Debris has
the streamformers. accumulated
on valve seat or
orifices.
Bradley • 215-784 Rev. P; ECN 14-00-007
AST4-Hand Valve Only
11
10
9
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.
Open all stops on mixing valve.
Install a pressure reducing valve.
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.
Check the valve assembly:
1. Check all tubing and fittings for proper assembly.
2. Tighten cap and nut on 1/8" tubing.
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).
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.
SN2013/AST4, SN2013/AST4-F, SN2033/AST4
8
4
2
9
AST4-Hand Valve, AST4-F Foot Valve
8/15/2014
AST4-F Foot Valve Only
14
7
6
5
12
3
1
13
9