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6.4.1
Replacing the inflow temperature sensor /
return flow temperature sensor and
pressure sensor
DANGER: RISK OF BURNING
There is a danger of scalding from heating water.
Sensors are connected directly to the pressurised heating
water.
▪ Before removal of the sensors, close the ball cocks on
the boiler inflow and boiler return flow, and depressurise
the system with the KFE cock.
Image 6-4 Replacing temperature sensors
1
Remove the boiler cladding (see
2
Remove the connector bracket.
3
Remove the plug from the sensor/sensor to be replaced.
4
Pull the sensor to be replaced out of the sensor thermowell. Re-
move the O-ring.
5
Insert a new sensor (check that the O-ring is seated correctly)
and secure with a connector bracket. Insert the cable with plug.
–
The connectors are shape-coded. Do not force the con-
nector!
6.4.2
Changing the flue gas temperature sensor
Image 6-5 Unscrew the flue gas temperature sensor
1
Remove the boiler cladding (see
connection on the sensor cable.
2
Open the boiler control panel (see
3
Disconnect the plug of the flue temperature sensor from circuit
board J8 and disconnect the sensor cable.
4
Unscrew the sensor sleeve from the flue gas duct using an SW
24 wrench
(Image
6-5). The flue gas temperature sensor can
only be completely changed with the sleeve.
5
Screw the new sensor sleeve into the flue gas duct and tighten it
carefully using the SW 24 wrench (plastic thread!).
Daikin/ROTEX A2 F
Oil condensing boiler A2 F
008.1546499_01 – 03/2018 – EN
Chap.
4.10).
Chap.
4.10). Release the plug
Chap.
4.7.1).
6
Controller and electronic components
6
Route the sensor cable into the boiler control panel, connect the
cable to the 6-pole PCB connector and plug it back onto the cir-
cuit board.
7
Ensure the strain relief of the cable
6.5
Replacing the fuse or circuit board
DANGER: RISK OF ELECTROCUTION
Touching live parts can result in an electric shock and
lead to potentially fatal injuries and burns.
▪ Before beginning work on live parts, disconnect them
from the power supply (switch off external main switch,
remove fuse) and secure against unintentional restart.
Image 6-6 Open the boiler control panel.
1
Remove the boiler cladding (see
2
Open the boiler control panel.
3
To replace the circuit board, remove all connector plugs.
4
Replacing the circuit board. To lift out, carefully push the side re-
taining clips
(Image
6-7) outwards.
Image 6-7 Changing the fuse
DANGER: RISK OF ELECTROCUTION
Electrostatic charges can lead to voltage arcing that can
destroy the electronic components.
▪ Ensure potential equalisation prior to touching the con-
trol panel PCB (e.g. by touching the control panel
holder).
1
Change the fuse
(Image
6-7).
2
Install the RoCon BE2 circuit board in the housing.
3
Connect all connector plugs to the circuit board.
(Image
4-10).
Chap.
4.10).
Installation and operating instructions
33
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