Oil Firing Unit; Commissioning; Assembly Of The Burner; Electricity Supply - herrmann HL 60 ALV.2 Instructions De Montage

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2.6 Oil firing unit

For the control and monitoring of the burner operation, the electromag-
netic firing unit Siemens LOA 24 (approval according to DIN EN 230:1991)
or the electronic firing unit Siemens LMO 14 (approval according to DIN
EN 230:2005) is used. Both firing units can be combined with the above
mentioned flame monitoring devices Danfoss LDS blue and Danfoss LDS
red. The main difference of the program sequence of both firing units is
the program time. The advantages of electronic firing units compared to
electromechanical firing units is the convenient display of status and error
messages using a flashing code, as well as the optional electrical remote
unlocking.
The starting sequence of the burner begins once the boiler thermostat
is closed and voltage is applied to terminal T2 of the Euro connector. In
this switching state, the oil pre-heater is supplied with voltage through
terminal 8 (see chapter 6). As soon as the pre-heating phase (release
time at an output temperature of 31°C: 145 s) is completed, the thermo-
stat in the oil pre-heater closes; now voltage is applied at terminal 3 and
the motor starts. At the same time, the firing unit starts the pre-aeration
time with pre-ignition. If there is no flame after the pre-aeration phase,
the control device opens the magnetic valve of the oil pump and fuel is
injected. However, if there is a flame or extraneous light after the pre-
aeration phase, the device is switched off and the the firing unit is
locked. Electromechanical firing units (Siemens LOA 24) can only be
unlocked after the bimetal has cooled down (approx. 50s after fault shut-
down). There is no such waiting time for electronic firing units (Siemens
LMO 14).
From fuel release, the ignition remains activated for a further period of
time (retarded ignition). In case of normal start-up, the flame is generated
within the safety period. The burner remains switched on until the boiler
thermostat opens and the voltage at terminal T2 drops. However, if no
flame is generated within 10s after fuel release (safety time) or it
extinguishes within this period of time, the magnetic valve of the fuel
pump is closed and the burner is locked. There is no automatic restart.
For restart, the reset push-button of the firing unit must be pressed.
However, if the flame extinguishes after the end of the safety time, the
firing unit makes a restart with pre-aeration and pre-ignition.
The oil firing unit is protected against low voltage. If mains voltage falls
below 165V, the burner is not started, or a fault shut-down is triggered
during operation. A minimum voltage of 175V is required to initialise the
starting sequence.
Heat request
Oil pre-heater
Oil pre-heater thermostat
Burner motor
(blower/pump)
Ignition
Magnet valve
Flame signal
t h Heating time of the oil pre-heater –
t prp Pre-aeration
t pri Pre-ignition
t poi Retarded ignition
t s Safety time
Program sequence for firing units
In case of fault shut-down, all outputs for fuel valves, burner motor and
ignition device are immediately (<1s) switched off. After fault shut-down,
the firing unit remains locked and the fault warning light is permanently
red. This condition also remains if the voltage is disconnected from the
mains.
The electronic firing unit LMO14 is also equipped with a visual operating
display and fault cause diagnosis which is indicated by the multi-coloured
LED (red/yellow/green) on the unlocking button.
t h t prp, t pri t s
t poi
Siemens
LMO 14
15 s
15 s
10 s
10 s
Operating mode
Waiting time
Oil pre-heater is heating up
Ignition phase, ignition controlled
Operation, flame OK
Operation, poor flame
Extraneous light after burner start
Low voltage
Fault, alarm
Issue fault code
PC interface diagnosis (specialist)
After the fault shut-down of the electronic firing unit LMO14 and when the
fault warning light LED is permanently red, the visual fault cause diagnosis
can be activated by pressing the unlocking button >3s. During the fault
cause diagnosis, the control outputs are de-energised and the burner re-
mains switched off.
Fault cause
No flame generation at the end of the
safety time
Extraneous light after burner start
Flame interruption during operation too
frequently (repetition limit)
Time monitoring of oil pre-heater
Wiring error or internal error,
permanent error of output contacts,
other errors
Quit the fault cause diagnosis and restart the burner by briefly pressing
the unlocking button once for approx. 1s (<3s).

3. Commissioning

3.1 Assembly of the burner

Sliding flange version:
– Mount sliding flange including sealing onto the heat generator using the
supplied M8 screws. The clamping screw of the sliding flange must be
positioned upwards.
– Insert burner with burner pipe into the flange until the burner pipe is
flush with the inside of the combustion chamber. Observe special
instructions of the heat generator manufacturer, if any.
– Tighten the clamping screw of the flange clamp.
Unit flange version:
– Mount unit flange with burner pipe including sealing onto the heat
generator using the supplied M8 screws. Position the wedge-shaped
unit flange such that the thicker side points downwards.
– Insert burner without burner pipe into the flange and fix it with a service
screw.
Siemens
LOA 24
–
13 s
13 s
20 s
10 s

3.2 Electricity supply

The relevant provisions of VDE (Association of German Electrical Engi-
neers), SEV (Swiss Association of Electrical Engineers) and/or ÖVE (Aus-
trian Association of Electrical Engineers) must be observed for the elect-
rical installations. Power supply: 230V~ 50Hz 10A. An all-phase load
switch according to VDE, SEV, ÖVE with a contact opening of at least
3mm must be used as main switch S1.
LED flashing code
off
yellow permanently
yellow flashing
green permanently
green flashing
green-red flashing
yellow-red flashing
red permanently
red flashing
red flickering
LED flashing code
red 2x flashing
red 4x flashing
red 7x flashing
red 8x flashing
red 10x flashing