CALEFFI 521312TM Инструкции по монтажу, вводу в эксплуатацию и техническому обслуживанию - Страница 11
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F. istr. 38650_5213 9-07-2007 14:04 Pagina 11
Fault finding
Under normal operating conditions the Caleffi 5213TM series thermostatic 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
Hot water at the cold taps
Fluctuating mixed water
temperature
Erratic flow of water from
the valve
No flow of water from the
valve
Valve does not fail safe
when tested
Cause
a) Operation of the insert
check valve is hindered;
check valve is not
sealing correctly.
b) Check valves not fitted.
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.
a) Installation not in
accordance with our
recommendations.
b) The minimum
temperature differential
not achieved.
c) Internal mechanism
hindered by debris.
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Corrective action
· Replace faulty check
valves
· Restore inlet conditions
within the limits of the
valve.
· Stabilise inlet supply
conditions.
· Clean filters.
· Restore inlet supplies.
· Clean debris or scale
from valve.
· Install as oulined in the
instructions.
· Raise hot water
temperature.
· Clean debris or scale
from valve.