Troubleshooting
Under normal operating conditions the Caleffi 2521 series mixing valve will provide a very
high level of performance. However, in some circumstances, where our maintenance plan is
not followed, the following problems may arise.
Symptom
Fluctuating mixed water
temperature
Erratic flow of water from
the valve
No flow of water from the
valve
Cause
a) Erratic supply temperatures
at the inlets of the valve.
b) Starvation of the water
supplies at the inlets
of the valve.
c) Incorrect commissioning
of the valve.
a) Insufficient water supplies.
b) Fluctuations in supply
pressures/temperatures.
c) Adverse effect created
by other draw off points
on the system.
a) In-line filters blocked.
b) Insufficient supply pressures.
c) Debris obstructing valve
operation.
Corrective action
·
Restore inlet conditions
within the limits of the
valve.
·
Stabilize inlet supply
conditions.
·
Clean filters.
·
Restore inlet supplies.
·
Clean debris or scale
from valve.
Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366
CALEFFI
Safety
The thermostatic mixer must be installed by a licensed plumber in accordance
with national regulations and/or relevant local requirements.
If the thermostatic mixer is not installed, commissioned and maintained properly, according to the
instructions contained in this manual, it may not operate correctly and may endanger the user.
Make sure that all the connecting pipework is water tight.
When making the water connections, make sure that the mixer connecting
pipework is not mechanically over-stressed. Over time this could cause breakages, with
consequent water losses which, in turn, could cause harm to property and/or people.
Water temperatures higher than 100°F can cause serious burns.
During the installation, commissioning and maintenance of the thermostatic mixer, take the
necessary precautions to ensure that such temperatures do not endanger people.
In the case of highly aggressive water, arrangements must be made to treat the water before
it enters the thermostatic mixer, in accordance with current legislation. Otherwise the mixer
may be damaged and will not operate correctly.
Leave this manual for the user.
