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7.5
Connecting the firing unit
Image 7-13 Firing unit
Connector
Pin
X1
1, 2 (N, L)
3 – 6 (nc, V1L, V1N,
nc)
7, 8 (L, N)
X2
1, 2 (N, L)
3, 4 (N, L)
5 – 7 (N, L, Fl)
X3
1 – 3 (L, N, Th)
4, 5 (L, DI)
X11
1, 2 (Rx, Tx)
3, 4 (nc, COM)
X12
1 – 5 (CUI)
X13
1 – 3 (⊥, FB, PWM)
X14
1 – 4 ( ⊥, ⊥, in, out)
5, 6 (-, +)
7 – 10 (Ub, ⊥, Hall,
PWM)
Daikin/ROTEX A2 F
Oil condensing boiler A2 F
008.1546499_01 – 03/2018 – EN
Function
Power supply
Oil solenoid valve
Power supply for oil pump con-
trol unit
Ignition of ignition transformer
Burner blower
Flame monitoring of the igni-
tion transformer
Oil preheating
Not assigned
eBus
Not assigned
Not assigned
Not assigned
Communication (firing unit – oil
pump control unit)
Oil pump pressure sensor
Burner blower speed regula-
tion
Connector
Pin
X15
1, 2 (ret)
3, 4 (flow)
5, 6 (flue)
7, 8 (DI2)
9, 10 (DI3)
Tab. 7-8
Assignment of the connection cables on the firing unit
7.6
Ignition transformer with flame
monitor
Image 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
Image 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:
7
Oil burner
Function
Return flow temperature
sensor
Inflow temperature sensor
Not assigned
Safety temperature limiter
Not assigned
Installation and operating instructions
41
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