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Adjustment of the high
limit safety cut-out (STB)
The high limit safety cut-out (STB) is factory-set to 110 °C.
If required, it can be changed over to 100 °C.
Such changes are irreversible.
Disconnect the control unit from its power supply.
Remove cap.
Remove the cover from the high limit safety cut-out.
Release the high limit safety cut-out fixing screws.
Release the fixing screws of the control unit front cover and pivot
forward.
Remove the high limit safety cut-out.
Release the clamping screw. Adjust the setting disc to 100 °C
in accordance with the scale and retighten the clamping screw.
Reassemble in reverse order.
NB
The maximum boiler water temperature (TK-max) must
not be set to 90 °C, if the high limit safety cutout has been
adjusted to 100 °C.
High limit safety cut-out changeover
Summary of Contents for R1
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