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Worcester-Bosch Greenstar Sense ll Manual

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FAQ
Sense ll – 6 720 812 775 (2014/10)
8 FAQ
Why do I have to set a set point value for the room
temperature even though the temperature is not
measured?
When you set a set point value for the room temperature you
change the heat curve. This also changes the room
temperature, because the temperature in the heating system
changes.
Why does the room temperature measured with a separate
thermometer not correlate with the displayed room
temperature?
The room temperature is influenced by a number of different
variables. If the controller is installed on a cold wall, it will be
affected by the cold temperature of the wall. It will be
influenced by the heat from a fireplace or chimney, for
example, if it is installed in a warm part of the room. Therefore,
a separate thermometer can indicate a different room
temperature than that set at the controller. To compare the
actual room temperature with the values measured by another
thermometer, the following is important:
• The separate thermometer and the controller must be
physically close to each other.
• The separate thermometer must be accurate.
• When comparing, do not measure the room temperature
when the system is heating up, as the two appliances may
react at different speeds to the change in temperature.
If you have followed these instructions and you can still detect
a discrepancy, you can calibrate the room temperature display
( page 34).
Why do the radiators get too hot with a high outdoor
temperature?
Even in summer mode radiators can heat up for a short period
in special circumstances, such as when the circulation pump
starts automatically at a certain interval to prevent it “seizing”.
If the circulation pump should by chance start immediately
after the heating up of hot water the residual heat that is not
used is moved away via the heating circuit and the radiators.
Why does the heat pump work at night if the heating is
negligible or very little?
There can be different reasons for this. It depends on which
setting your installer has made for temperature reduction.
•Reduced mode: The heat pump works even when the
heating requirement is less to achieve the set room
temperature, even if it is low.
•Outside temperature threshold and Room temperature
threshold: the heating system switches automatically on if
the measured temperature drops below the set value. The
heat pump will then start as well.
•Protection from freezing: The heating mode is also used
to avoid the system freezing if the outdoor temperature
drops.
The measured room temperature is higher than the
required room temperature. Why is the heat source
nevertheless running?
The heat source may be heating hot water.
Your system can be set to three different types of control
( Chapter 2.3, page 4).
With weather-compensated control (including with room
temperature influence), the heat source can still operate even
if the measured room temperature is higher than the set room
temperature. Adjoining rooms are hence always sufficiently
heated without their own controller.
Why does the heating not switch off even though the
outside temperature has reached the temperature
threshold set for summer shutdown?
Summer shutdown ( ) based on the outside temperature
takes the thermal inertia of the heated building mass into
account (delayed effect due to insulation levels and wall
construction). Therefore, when the temperature is reached
during the transitional period, it takes a few hours before
switchover actually occurs.
9 Eliminate fault
9.1 Eliminating “sensed” faults
A “sensed” fault can have various causes, which can usually be
eliminated by taking simple steps.
If it is too cold or hot for you, for example, the following table
will help you eliminate “sensed” faults.
… 39 …


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