Viessmann VITOLIGNO 300-P Service Instructions Manual page 106

Troubleshooting
Repairs
(cont.)
Temperature limiter for limiting the maximum temperature
Immersion thermostat, part no. 7151 728
Contact thermostat, part no. 7151 729
C
B
A
A Heating circuit pump
B Control thermostat (temperature
limiter)
C Plug sÖ of the thermostat (temper-
ature limiter) to the control unit
106
M
1~
Electromechanical temperature limiter
according to the liquid expansion princi-
ple.
Switches the heating circuit pump off
when the set value has been exceeded.
In such cases, the flow temperature
reduces only slowly, i.e. it may be sev-
eral hours before the system restarts
again automatically.
Specification
Setting range
Terminals
Switching differential
■ Immersion thermo-
stat
■ Contact thermostat max. 14 K
30 to 80 °C
Screw terminals
2
for 1.5 mm
max. 11 K