9
Bradley Corporation • 215-1289 Rev. H; EN 06-909
1/29/07
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 step-by-step procedure.
Cause: The stop and check sections of the valve do not move
freely.
Solution: Dirt and debris have collected on the check screen or
seat, limiting the movement of the stop and checks. Remove
the stop and checks, clean the screen and seat and reassemble
the valve (see Figure 8). Do not remove the seat. The compo-
nents 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
(part number S65-179).
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 S65-177).
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 procedure.
Cause: Recirculation is not balanced.
Solution: See “Recirculation instructions” on page 6 and follow the step-by-step procedure.
Cause: 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.
Solution: Enlarge the supply line size, reconfigure the supply line or regulate the supply usage.
STOP AND
CHECKS
Figure 8
VALVE
SEAT
VALVE
SCREEN
Bradley EFX 60 Thermostatic Mixing Valve with Optional Cabinet
Installation and Maintenance Instructions
Model S19-2200 Series
