02/2017 - Art. Nr. 4200 1015 6700D
17
Function
Heating function
Operating function
Safety function
Function diagram BLUE 1. ..
Principle diagram
1
Oil burner pump
2
Oil pressure regulator
3
Oil preheating
4
Diaphragm valve for closing off
the nozzle
5
Burner tube
6
Identification plate
7
Linearised air metering drum
9
Blower
10
Burner motor
11
Solenoid valve with bypass for
nozzle closing system
Heating function
If the system demands heat, the pre-
heater is switched on first.
When the oil preheating temperature is
reached, a thermostat in the pre-heater
activates the program sequence. The
heating time with cold start is
approximately 2 minutes.
Operating function
- If heat is requested by the boiler
regulator, the automatic oil
combustion control unit starts the
program sequence.
- The motor starts, the igniter is
switched on and the preventilation
period of 15 seconds commences.
- During the preventilation period, the
furnace is monitored for flame signals.
- After preventilation, the fuel-oil
solenoid valve
11
and diaphragm
valve
4
open and the burner starts.
- The igniter remains switched off while
the burner is in operation.
Controlled shutdown
- Boiler regulator interrupts heat
request.
- Fuel-oil solenoid valve
11
and
diaphragm valve
4
close and the flame
is extinguished.
- Burner motor switches off.
- Burner enters standby.
Safety function
A safety shutdown occurs:
- if a flame signal >0,7µA is present
during preventilation (parasitic flame
monitoring)
- if no flame is produced (flame signal
<1,3µA) within 9 seconds (safety time)
of start-up (fuel authorisation)
- if no flame is produced (flame signal
<1,1µA) after an unsuccessful restart
attempt in the event of flame failure
during operation.
A safety shutdown is indicated by the
malfunction lamp lighting up and it is
then only possible to reenable the
burner by pressing the reset button after
the cause of the malfunction has been
rectified.
For further information, see the
automatic combustion control unit
description.
en
