Bradley EFX 8 Thermostatic Mixing Valve with Optional Cabinet
Installation and Maintenance Instructions
Model S19-2000 Series
9
Bradley Corporation • 215-1291 Rev. L; EN 07-903A
5/14/08
Thermostatic Mixing Valve Troubleshooting, continued . . .
Problem: Limited water flow
Cause: The inlet shut-off valve may be partially closed or there has been a significant decrease in water
pressure.
Solution: See “Check the thermostat for proper operation” on page 8 and follow the outlined procedure.
Cause: The stop and check sections of the valve do not move freely.
Solution: Dirt and debris have collected on the stop/check valve seat, limiting the movement of the
stop/checks. Remove the stop/checks, clean the seat and reassemble the valve (see Figure 9). The
stop/checks may also be disassembled and cleaned. The components may be brushed with a small wire
brush to remove debris. If the stop/checks need to be replaced, contact your Bradley representative
and ask for Stop/Check Valve (part number S27-102 — Rough Brass, S27-292A — Chrome).
Problem: Improper water temperature
Cause: Recirculation is not balanced.
Solution: See “Recirculation instructions” on page 6 and follow the step-by-step procedure.
Problem: External leaks in the system
Cause: Either the NPT joints or the o-rings have been damaged.
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 (part number S65-170).
Problem: Temperature fluctuation
Cause: Thermostat is slowly failing.
Solution: See “Check the thermostat for proper operation” on page 8 and follow the step-by-step proce-
dure.
Cause: Recirculation is not balanced.
Solution: See “Recirculation instructions” on page 6 and follow the step-by-step procedure.
Cause: The inlet supply line to the mixing valve is being shared by other pieces of equipment that are used
only periodically, such as laundry appliances and 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.
Solution: Enlarge the supply line size, reconfigure the supply line or regulate the supply usage.
Clean the valve
seats and other
components with
a small wire
brush.
STOP/CHECK
VALVES
Figure 9
S19-2000
