76
3064458_201811
High limit safety cut-out (thermostat)
The high limit safety cut-out shuts down the boiler when the temperature
reaches 110 °C.
This causes the burner to be shut down and results in a lockout fault Þ with
fault code 01. When the temperature drops below the shut-down point, the
boiler restarts once the fault has been acknowledged.
Boiler water temperature sensor
• The boiler water temperature sensor is a contact sensor on the combus-
tion chamber. The appliance is controlled via the temperature determined
here.
• The maximum possible boiler water temperature is 90 °C. Exceeding this
temperature causes the boiler to shut down and results in a burner cycle
block (factory setting 7 min.).
• The boiler water temperature sensor is a high limit safety cut-out and
shuts down the appliance at 105 °C (lockout). Þ Fault code 02
• The boiler water temperature sensor is a temperature limiter and shuts
down the appliance at 95 °C (without lockout). Þ Fault code 06
Flue gas temperature sensor
The ue gas temperature sensor shuts down the boiler when the ue gas
temperature exceeds 115 °C Þ Fault code 07.
The ue gas temperature is determined by a sensor in the condensate pan.
Temperature monitoring
System pressure monitoring Dryreprotection
The appliance is equipped with a pressure sensor that monitors the operat-
ing pressure in the heating circuit. When the system pressure falls below
0.5 bar, the burner is shut down without appliance lockout. Once the pres-
sure exceeds the shut-down threshold again, the appliance restarts indepen-
dently.
30. Safety devices
To Next Page
Loading...
