Installation
SN2003/IR, SN2023/IR
Bradley Corporation
• 215-1073 Rev. H ; EN 10-00-015
7-12-2010
9
Before attempting to troubleshoot the valve or disassemble the components,
check for the following conditions:
• If stop/check valves are used, make sure that they are fully 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 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
Solution
External leaks in
system.
O-rings have been
damaged.
Replace O-rings where necessary. Repair Kit (part no S65-259).
Improper water
temperature or
temperature
fluctuation.
Thermostat is
slowly failing
or not working
at all.
Check the thermostat for proper operation.
1. At room temperature (80° F or less) remove the cap and thermostat.
2. Place thermostat into a container with 115° F water. The pushrod should pop out of the thermostat
approximately 1/10".
3. If thermostat pushrod does not pop out, replace thermostat (part no. S65-259).
Valve temperature
is not properly set.
Adjust the temperature. Using a blade screwdriver, turn the adjustment stem counterclockwise to
increase the temperature or clockwise to decrease the temperature.
Limited water flow.
Dirt and debris
have built up in the
valve or strainer.
1. Check to make sure both hot and cold supplies are connected to the Vernatherm mixing valve and that
they have water flow.
2. Remove and clean strainer. If strainer needs to be replaced, contact your Bradley representative to
order Bradley part no. 173-028.
3. Check the piston for smooth movement:
A. Remove the valve’s cap and thermostat.
B. Push down on the piston with your finger (the piston should move freely). If the movement is not as
it should be, the piston needs to be cleaned. Follow the method outlined below for cleaning the piston
and valve body:
• Remove the thermostat. Lift piston out with a needle-nose pliers and remove spring.
• Any cleaner suitable for brass and stainless steel may be used (if cleaning with suitable cleaner
is not sufficient to remove debris, a 400-grit sandpaper may be used to polish and hone the
piston and valve body).
• Snap spring into piston (it will detent); reassemble into valve body. Retest the piston.
C. If, after a thorough cleaning, the piston does not move freely, replace (part no. S65-259).
Troubleshooting Thermostatic Mixing Valve (S01-520)
6
5
4
3
2
1
10
10
7
Strainer
173-028
Strainer
173-028
Valve Body
Spring
Thermostat
Piston
Stem
O-Ring
O-Ring
9
8
Cap
Nut 3/8-24 Hex Jam
Item
Qty.
Description
4
1
Thermostat
6
1
O-Ring
7
1
O-Ring
Repair Kit S65-259
Tempered Line Adapter Assembly Option
(S39-685)
Strainer 173-028
