Schwank ThermoControl Plus 4 - Manual (Page 16)

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4.6 Manual operation FIX
Use the
FIX
button to select different operating modes.
4.7 Button for service maintenance mode
To change the FIX
mode push the
FIX
button.
Press DISP when the desired operation mode
appears (for example: continuous FIX mode). The
control-unit switches back to the main display and the
selected mode is activated.
night-temperature mode
day-temperature mode
freeze protection temperature
For service or maintenance, to have the heater(s) in full
operation regardless of the current room temperature, push
the button. Switch back to the base display mode by
pushing this button again.
Push
FIX
to return to the main display.