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High limit safety cut-out
Triggering the function
If the boiler water temperature exceeds 95 °C, the high
limit safety cut-out responds.
Cancelling the function
Note
The high limit safety cut-out can only be reset
(unlocked) once the boiler water temperature has
reached approx. 70 °C.
!
Please note
If this function is not reset, it inhibits the safety
equipment function and can result in system
damage.
Reset the high limit safety cut-out.
Whenever the high limit safety cut-out has been
triggered, check afterwards that the thermally
activated safety valve is reset.
B
A
Fig. 69
Sensors
Sensor type Pt1000:
Flow temperature sensor
■
Buffer temperature sensor
■
Return temperature sensor
■
■
Flue gas temperature sensor
■
Outside temperature sensor
Connection
See chapter "Connection and wiring diagram" from
page 142.
(cont.)
Note
The high limit safety cut-out can only be reset man-
ually.
1. Move cover
on the programming unit to the
A
right.
2. Press green button
B
out.
A faint "click" will be audible; the high limit safety
cut-out is reset.
3. Close cover
on the programming unit.
A
4. Acknowledge excess temperature at the program-
ming unit with
.
d
Curve of the sensor from the extension kit for heating
circuit with mixer:
Extension kit installation instructions
Maintenance
of the high limit safety cut-
127
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