Troubleshooting - Bradley SN2004/AST4 Manual Del Usaurio

Installation
Troubleshooting Air Valves (AST4, AST4-F)
Turn off water supplies to the
unit before troubleshooting.
Item Qty.
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
Valve will not shut Timing
off . mechanism is
clogged .
One or more Water is not being
individual operating supplied to unit .
stations fail to turn
Water pressure is
on .
over 80 PSI .
Failed diaphragm/
magnet assembly .
One or more There is an air
individual operating leak .
stations turn off too
quickly or run too
long .
Pushbutton does Air volume may
not work properly . not be sufficient to
operate valve .
Water is dripping Debris has
from the accumulated
streamformers . on valve seat or
orifices .
Bradley • 215-1070 Rev. K; ECN 14-00-007
Description
Cause
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 .
SN2004/AST4, SN2004/AST4-F, SN2024/AST4
AST4-Hand Valve Only
11
10
9
8
9
AST4-Hand Valve, AST4-F Foot Valve
Solution
AST4-F Foot Valve Only
14
7
6
5
12
3
4
1
2
13
8/18/2014 9