5
x
Control
35
FA ROTEX A1 BO - 10/2007
5.5
Changing the sensors
Sensors inside the unit (fig. 5-10, fig. 5-11) can be changed without having to open the boiler control panel.
Changing flow / return flow temperature sensor
1.
Remove the sound insulation hood and the boiler panelling. Remove the heat insulation layers for changing the flow
temperature sensor (see section 8.2.1).
2.
Pull out the connectors on the flow temperature sensor/ return flow temperature sensor (fig. 5-12).
3.
Unscrew the flow /return flow temperature sensor using an open-jaw wrench SW 15 (fig. 5-13).
4.
Screw in the new flow /return flow temperature sensor and plug in the cable with connector.
The connectors are shape-coded. Do not force the connector!
WARNING!
Live parts can cause an electric shock on contact and cause life-threatening burns and injuries.
• Before beginning work on the oil condensing boiler, disconnect it from the power supply (switch off fuse,
main switch) and secure against unintentional restart.
Fig. 5-10 Position of the temperature sensor on the boiler (1)
Fig. 5-11 Position of the temperature sensor on the boiler (2)
33
Flow temperature sensor
34
Return flow temperature sensor
37
Flue gas temperature sensor
WARNING!
There is a danger of scalding from heating water.
flow and return flow temperature sensors are connected directly to the pressurised heating water.
• Close the ball cocks on the boiler flow and boiler return flow before removing the sensor, and depressurise
the system through the KFE cock.
Fig. 5-12 Pull out the connector on the flow temperature sensor
Fig. 5-13 Unscrew the flow temperature sensor
