Viessmann Vitoligno 300-P Service Instructions For Contractors page 93

Repairs
(cont.)
C
B
A
A Heating circuit pump
B Control thermostat (temperature
limiter)
C Plug sÖ of the control thermostat
(temperature limiter) to the control
unit
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
Troubleshooting
30 to 80 °C
Screw terminals
2
for 1.5 mm
max. 11 K
max. 14 K
93