Maintenance Fuses; Battery; High Limit Safety Cut-Out; Triggering The Function - Viessmann Vitoligno 300-C Installation And Service Instructions For Contractors

Maintenance
Fuses
Installation position, see page 117.
F10
■ 10 A (slow)
■ 250 V 50/60 Hz
Power cable KSK
■
F20
■ 5 A (slow)
■ 250 V 50/60 Hz
■ Power cable ZPK

Battery

The battery serves to save the time and date in the
event of a power failure.
Installation position, see page 117.

High limit safety cut-out

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 man-
ual reset.

Triggering the function

The high limit safety cut-out responds if the flow tem-
perature exceeds 100 °C.

Cancelling the function

Note
The high limit safety cut-out can only be reset
(unlocked) once the flow temperature has fallen to
approx. 70 °C.
!
Please note
If this function is not reset, it inhibits the safety
equipment function and can result in system
damage.
After each triggering, check that the thermally
activated safety valve is reset.
74
F30
■ 5 A (slow)
■ 250 V 50/60 Hz
■ Power cable HKK
Button cell, type CR2032, 3 V
■
■ Replacement: every 5 years
A
Fig. 39
1. Move cover on the programming unit to the
A
right.
2. Press the green button of the high limit safety cut-
out. A quiet "click" will be audible. The high limit
safety cut-out has been reset.