7
Oil burner
Installation and operating instructions
41
Daikin/ROTEX A2 F
Oil condensing boiler A2 F
008.1546499_02 – 04/2018 – EN
7.5
Connecting the firing unit
Fig. 7-13
Firing unit
Connector
Pin
Function
X1
1, 2 (N, L)
Power supply
3 – 6 (nc, V1L, V1N,
nc)
Oil solenoid valve
7, 8 (L, N)
Power supply for oil pump con-
trol unit
X2
1, 2 (N, L)
Ignition of ignition transformer
3, 4 (N, L)
Burner blower
5 – 7 (N, L, Fl)
Flame monitoring of the igni-
tion transformer
X3
1 – 3 (L, N, Th)
Oil preheating
4, 5 (L, DI)
Not assigned
X11
1, 2 (Rx, Tx)
eBus
3, 4 (nc, COM)
Not assigned
X12
1 – 5 (CUI)
Not assigned
X13
1 – 3 (
⊥
, FB, PWM)
Not assigned
X14
1 – 4 (
⊥
,
⊥
, in, out)
Communication (firing unit – oil
pump control unit)
5, 6 (-, +)
Oil pump pressure sensor
7 – 10 (Ub,
⊥
, Hall,
PWM)
Burner blower speed regula-
tion
Connector
Pin
Function
X15
1, 2 (ret)
Return flow temperature
sensor
3, 4 (flow)
Inflow temperature sensor
5, 6 (flue)
Not assigned
7, 8 (DI2)
Safety temperature limiter
9, 10 (DI3)
Not assigned
Tab. 7-8
Assignment of the connection cables on the firing unit
7.6
Ignition transformer with flame
monitor
Fig. 7-14
Ignition transformer
Item
Designation
1
Ignition cable connections (2x 7.5 kV)
2
Status display (LED)
3
Flame monitor connection
4
Earth connection
5
Ignition connection (input)
Tab. 7-9
Legend for
Fig. 7-14
The ignition transformer with flame detection is a high-frequency ig-
nition device with a vibration frequency of approx. 15 - 20 kHz. The
flame of fuel/air mixture is detected by the ignition electrodes via
special switching.
With a flame present, a stream of ions is set up between the ignition
electrode and earth. The signal is evaluated in the ignition device.
This signals to the firing unit whether there is a flame or not.
The ignition can be operated in parallel with the flame monitor,
without influencing it.
An LED indicates the operating status:
