8
Bradley Corporation • 215-1289 Rev. H; EN 06-909
1/29/07
Thermostatic Mixing Valve Maintenance continued . . .
Check the thermostat for proper operation
To check the valve's thermostat for proper operation, follow the
procedures outlined below.
1. Remove the top cap and pull out the push rod and thermostat
(see Figure 5 on page 7).
2. Insert a 7/16" dia. rod into the thermostat bellows. Mark the
length of the rod inside the bellows (see Figure 7).
3. Mark the length of the thermostat bellows (at room temperature,
with 10 lb. of force, the bellows length should be approx.
2-2/3") (see Figure 7).
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 (part
number S65-178).
Adjust the temperature
To adjust the valve's temperature to other than the factory preset,
follow the procedures outlined below.
1. Turn on the water and let it run until at least 10 GPM is
flowing through the valve.
2. Remove the slotted cover screw to expose the set screw.
3. Using a 5/32" hex-head Allen key, turn the set screw
counterclockwise
to
increase
the temperature or
clockwise
to
decrease
the temperature.
4. When the adjustment is complete, replace the cover screw
and turn off the water.
Thermostatic Mixing Valve Troubleshooting
Note: Before attempting to troubleshoot the valve or disassemble the components, check for the following
conditions:
• make sure that the check valves are fully open (the slotted stem must be flush with the stop/check cap)
(see Figure 1 on page 3) and that all inlet and outlet shut-off valves are open
• make sure that the hot and cold inlet pipes are connected properly, and that there are no cross-
connections or leaking stop/check valves
• check the hot water heater output to make sure that it 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: No hot water flow (cold water flow only)
Cause: The thermostat has failed and, subsequently, the safety shut-off has engaged (the shut-off valve has
closed on either the inlets or outlet).
Solution: See “Check the thermostat for proper operation” above and follow the step-by-step procedure.
7/16"
ROD
Bellows length
should be 2-1/2"
to 2-3/4"
Figure 7
THERMOSTAT
Bradley EFX 60 Thermostatic Mixing Valve with Optional Cabinet
Model S19-2200 Series
Installation and Maintenance Instructions
