Ii.9. Fuel Size; Ii.11. Factory Settings; Ii.12. About The Program - TECH ST-450zPID User Manual

temperature. This, additionally, indicates that the weekly control is active.
Data deletion function is a simple method to remove all previously saved
weekly programme settings to enter new settings.

II.9. Fuel size

This option is used to select one of two fuel sizes: coarse or fine. Appropriate
blowing power and fuel supply rate are selected for each of the sizes.
Room temperature reduction
II.10.
After the room controller reaches the preset room temperature, the preset
boiler temperature (set in the installation menu - see Item III.16) will drop by
the value set there. The reduced temperature will not be lower however than
the preset minimum central heating temperature.
Example: Temperature preset on the boiler: 55ºC
Room temperature reduction: 15ºC
Minimum temperature set on the boiler: 45ºC (factory setting)
Once the preset room temperature is reached (indicated by the room controller)
the temperature preset on the boiler will drop to 45ºC i.e. only 10ºC although
the room temperature reduction is 15ºC. At the same time a message reading
"!-10º" will be shown in the main display next to the preset boiler temperature.

II.11. Factory settings

The controller is pre-configured for its operation. However, its settings should
be modified to meet your individual needs. You can return to the factory
settings at any time. If you enable the factory settings option you will lose all
of your own boiler settings, which will replaced with the settings saved by the
boiler manufacturer. From now on you can re-set your own parameters of the
boiler.

II.12. About the program

You can use this function to check the software version installed in the
boiler controller.
ST – 450 z PID
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