CALEFFI 520516AC Manual - Halaman 10

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Troubleshooting

Under normal operating conditions the Caleffi AngleMix 520 series thermostatic mixing valve

will provide a very high level of performance. However, in some circumstances, where the

following maintenance schedule is not followed problems may arise.

Recommended maintenance schedule:

Tests should be conducted regularly to monitor the thermostatic mixing valve performance,

as deterioration of performance could indicate that the valve and/or the system require

maintenance. If, during these tests, the temperature of the mixed water has changed

significantly in comparison with the previous test, the details given in the installation and

commissioning sections should be checked and maintenance conducted.

The following should be checked regularly to ensure that the optimum performance levels of

the valve are maintained. Check every 12 months at least, or more often if necessary.

1) Check and clean the system filters.

2) Check that any check valves positioned upstream of the Caleffi thermostatic mixing valve are

operating correctly, without problems caused by impuritites.

3) Limescale can be removed from internal components of the thermostatic mixing valve by

immersion in a suitable de-scaling fluid.

4) When the components which can be maintained have been checked, commission the valve.

Symptoms

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 shut-off function not

performed when tested

Cause

a) Operation of check valve is

hindered; Check valve is not

sealing correctly.

b) Check valves not fitted.

a) Erratic supply temperatures at

the inlet 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 the supply

pressures/temperatures.

c) Adverse effect created by other

draw off points on the system

a) In-line filers blocked.

b) Insufficient supply pressures.

c) Debris obstructing valve

operation.

a) Installation not compliant with

instructions.

b) Minimum temperature differ-

ence not reached.

c) Valve mechanism blocked

by dirt.

Corrective action

- Replace faulty check valve

- Restore inlet conditions within

the limits of the valve.

- Stabilize inlet supply condi-

tions.

- Clean filters

- Resore inlet supplies

- Clean debris or scale from

the valve.

- Follow installation instructions.

- Increase hot water

temperature.

- Remove dirt/limescale from

the valve.