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EFX 125/S19-2300
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
must be flush with the stop/check cap) 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 15° 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 10 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
10/15/2012
Stop/Check Valve
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 (S65-289).
Inspect Thermostat:
1. Remove the top cap and pull out the push rod and thermostat.
2. Insert a 7/16" dia. rod into the thermostat bellows.
3. Mark the length of the thermostat bellows (at room temperature,
with 10 lb. of force, the bellows length should be approx. 2-3/4" to
3-1/4").
4. If the thermostat bellows 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 (S65-178).
Clean Stop and check Valves:
Remove the stop and checks, clean the screen and seat and
reassemble the valve. Do not remove the seat. The components
may be scraped with a screwdriver 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 (S65-212).
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 • 215-1594 Rev. C; EN 10-09-010
Installation
Stop/Check
Strainer
Valve Seat
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