Bradley S19-2000 Serie Manual Del Usuario página 6

S19-2000, S19-2000EFX
Troubleshooting Thermostatic Mixing Valve
Before attempting to troubleshoot the valve or
disassemble the components, check for the following:
• Stop/check valves are fully open (the slotted stem
extends approximately 1/2" from the stem nut) and
that all inlet and outlet shut-off valves are open.
• Hot and cold inlet pipes are connected properly,
and that there are no cross-connectio ns or leaking
stop/check valves.
• Water heater output is at least 20° F above the set
temperature.
Be sure to close the appropriate shut-off valves prior
to disassembly of the valve and reopen the valves
after inspection and repair is complete.
Problem Cause
External leaks in the Either the NPT joints or the o-rings have been
system damaged.
No hot water flow (cold The thermostat has failed and, subsequently, the
water flow only) safety shut-off has engaged.
Limited water flow The inlet shut-off valve may be partially closed
or there has been a significant decrease in water
pressure.
Dirt and debris have collected on the check
screen or seat, limiting the movement of the stop
and checks.
Temperature fluctuation The stop and check sections of the valve do not
or improper Temperature move freely.
Thermostat is slowly failing.
Inlet supply line to the mixing valve is being
shared by other pieces of equipment that are
used only periodically, such as laundry appliances
or washdown stations. It may reduce the inlet
pressure to the mixing valve to less than 3 PSI.
The supply line size may not be large enough to
supply both the valve and the other appliances.
Recirculation is not balanced.
Piston does not move freely and must be cleaned. See next page for piston disassembly and cleaning directions.
6 7/18/2012
Top Cap &
Thermostat
Thermostat
Bellows
Solution
Replace the NPT joints and/or o-rings where necessary. For
replacement of o-rings, contact your Bradley representative and ask
for O-Ring Seal Kit (S65-170).
Inspect Thermostat:
1. Remove the top cap and thermostat.
2. Insert the 5/16" dia. push rod into the thermostat bellows.
3. Mark the length the push rod extends into the bellows (at room
temperature, with 10 lb. of force. the length should be approx.
15/16" – 1-3/16").
4. If the push rod length is not in the proper range, the thermostat
must be replaced (it cannot be repaired). Contact your Bradley
representative and ask for Thermostat Kit (S65-171).
Clean Stop and check Valves:
Remove the stop and checks, clean the seat and reassemble the
valve. Do not remove the seat. The components may be brushed
with a small wire brush to remove debris. A pair of tweezers works
well for pulling debris out from the seat. If the stop and checks need
to be replaced, contact your Bradley representative and ask for
Check/Stop Kit (S27-102-Rough Brass, or S27-292A-Chrome).
Clean Stop and Check Valves as described above.
Check Thermostat as described above, or replace.
Enlarge the supply line size, reconfigure the supply line or regulate
the supply usage.
Review recirculation set up on page 5.
Bradley • 215-1291 Rev. N; EN 12-09-002
Installation
5/16" Push
Rod
Push Rod length
should extend
15/16" – 1-3/16"
into Bellows