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OPERATING YOUR ST9520C
Enquiry Mode
As the heart of your system, the ST9520C has access to temperature information
from the other system components, and allows you to enquire about this information.
To enter Enquiry Mode, ensure the slider is in the RUN position, then press and
hold the
button for 4 seconds.
The LoT™ Display will show the message ‘INFO MENU’ to confirm that you have
entered Enquiry Mode.
Pressing the
or buttons then allows you to step around and view the available
information. The LoT™ Display will continue to update to tell you what information
is being viewed, and the main display will show the value. If the information is not
available, the display will show dashes -- -- instead of a temperature value. The table
below shows the type and sequence of information available in Enquiry Mode.
To exit Enquiry Mode:
If the button is not pressed for 30 seconds, your ST9520C will return to RUN mode.
Information LoT™ Message Other display symbols
Zone 1 temperature Z1 TEMP
Zone 1 temperature setting Z1 SET
Zone 2 temperature Z2 TEMP
Zone 2 temperature setting Z2 SET
* OpenTherm fault information OPENTHERM
* This information will only be shown if OpenTherm communications is enabled, and if there
is a fault. -- -- on the display means the OpenTherm communications has stopped. If the
display shows ‘F’ followed by a number, this is a fault-code sent by the boiler. See FAQ AND
TROUBLESHOOTING section for advice.
//
/
/ /
14


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