High Limit Safety Cut-Out - Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual

Service

High Limit Safety Cut-out

102
Vitoligno 300-C Installation/Service
CAUTION
If this function is not reset, it inhibits the safety
equipment function and can result in system damage.
Whenever the high limit safety cut-out has been
triggered, check afterwards that the thermally activated
safety valve is reset.
The high limit safety cut-out is part of the boiler. The
high limit safety cut-out is located behind the boiler
programming unit.
Note: Any high limit safety cut-out response requires
a manual reset.
Triggering the function
The high limit safety cut-out responds if the supply
temperature exceeds 230°F (110°C).
Cancelling the function
Note: The reset can only take place once the supply
temperature has dropped to approx. 140°F (60°C).
1. Move cover A on the programming unit to the right.
2. Press the green button on the high limit safety cut-out.
A quiet "click" will be audible. The high limit safety
cut-out has been reset.
3. Close cover A on the programming unit.
4. Acknowledge excess temperature at the programming
unit of the control unit with d.