Daikin A2 F, Installation And Operating Instructions Manual

Page: 33 / 64

6 Controller and electronic components
Installation and operating instructions
33
Daikin/ROTEX A2 F
Oil condensing boiler A2 F
008.1546499_01 – 03/2018 – EN
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 Chap. 4.10 ).
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 Chap. 4.10 ). Release the plug
connection on the sensor cable.
2 Open the boiler control panel (see Chap. 4.7.1 ).
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!).
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 ( Image 4-10 ).
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 Chap. 4.10 ).
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.