strada Aquatherm STA140UC, Техническое руководство

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28/03/19
9
Troubleshooting
SYMPTOM SOLUTION
The water at the tap
is lukewarm or cold.
1) Check the thermometer is showing the store temperature is at
or approaching 75
° C - 80

C.
2) If this is not the case, ensure that the boiler is firing, that the
control thermostat is set at 75⁰C and allow sufficient time for the
store to reach working temperature
The thermal store is
at 75°C and the
water at the taps is
still lukewarm or cold
1) If the store is at or approaching 75°C - 80

C, check that the
Thermostatic Mixing Valve is correctly set. The maximum
temperature of water from the Mixing Valve should be about
55

C.
2) If the valve is correctly set, check that the flow rate at any outlet
(e.g. bath tap) does not exceed 18 Litres per minute. If the flow
rate is too high then sufficient heat transfer inside may not be
occurring.
Turn the flow through the tap down or fit a suitable flow
restrictor and the temperature will increase.
3) If Stage 1 and 2 has not resolved the problem a competent
installer should check the mixing valve for blockages within the
internal filter of the mixing valve.
Not enough hot
water and less than
75°C on the
thermometer. Check the heat sources and their input in (kW) to the store as this will
be lower than the kW output which will result in the store not
producing enough heat for the exchanger to provide heated mains
pressure water.
There is a brownish
tint to the mains
pressure hot water.
This could be a symptom with the heat exchanger coil leaking inside
the thermal store. An installer should have this tested. If this is the
case, pay attention to the Feed & Expansion Tank as the pressure
within the store will increase causing the tank to overflow continually.