Advertisement
LANDIS OIL BURNERS AUTOMATIC CONTROLLER LOA24
Use
LOA... safety devices are intended for use solely with QRB... photore-
sistors, for lighting and controlling low capacity forced air light oil bur-
ners with max. capacity 30 kg/h in accordance with standard DIN
4787.
The One or two flamess are lit through electrical connections with or
without post-ignition.
To replace LAl... AND LAB.. WITH LOA...
LOA... models can be used as replacement for LAl... and LAB.. con-
trollers by means of the adapter KF8819 and without the need to
change the electrical wiring. Because the LOA is smaller in dimen-
sions, when it is used with the adapter the external dimensions are
almost identical, which means that there is no need to move the reset
button.
Performance
The controllers just need plugging in, so they can be mounted in
almost any position: on the burner, on the electrical panel or on the
control panel. The casing is made of robust heat-resistant plastic and
contains:
the thermic programmer operating a multiple switch control system
with ambient temperature compensator
flame signal amplifier with flame relay
warning light indicating lockout and associated sealed reset but-
ton.
The plug-in socket, also made of robust heat-resistant plastic, con-
tains the 12 terminals and also:
3 neutral terminals, ready wired up to terminal 2
4 earth terminals for earthing the burner
2 supplementary terminals numbered "31" and "32".
The socket has two openings at the bottom for the leads; 5 others
with threaded connection for cable holders PG11 or 3/4UNP for non-
metallic sleeves are located on a mobile stuffing box, one on either
side and 3 on the front.
There are two flexible metal tongues on the sides of the socket for
mounting.
To dismantle it only requires gentle pressure with a screw driver in the
slot of the mounting guide. The base dimensions of the socket are
exaclty the same as for types LAB/LAI and there is no difference in
the diameter of the reset button, the two mounting screws and the
flange of the burner earth.
Safety at low voltage levels
Safety devices against any reduction in the mains voltage operate on
a special electronic circuit which, in the event of the power supply fal-
ling below 165V~, stops the burner switching on without releasing the
fuel and locks out the apparatus.
Wiring diagram of the programme
To ensure correct wiring it is essential to observe local standards and
follow the instructions of the burner manufacturer with regard to
assembly and start-up.
Program's legend:
A'
A
B
C
D
tw
tl
t3
t2
t3n
t4
Internal layout
AL
BV.
EK
FR
fr
FS
G
K
OH
OW
QRB Photo-resistant cell (flame detector)
R
TZ
tz..
V
W
Z
The above are safety devices!
To tamper with them in any way may have unforeseeable conse-
quences!
Do not open them!
APPENDIX: COMPONENTS CHARACTERISTICS
Controller output signals
Required input signals
Burner start up with light oil pre-heater OH
Burner start-up without light oil pre-heater
Flame lit
Normal operation
Normal stop through R
Oil pre-heating time until operational all clear given through
contact OW
Pre-purge time
Pre-ignition time
Safety time
Post-ignition time
Interval between the flame lighting and energising of solenoid
2a at terminal 5
Optical alarm
Fuel valve
Reset button
Flame relay
Flame relay contacts
Flame alight signal
Burner motor
Flame relay anchor to delay the tzl command in the event of a
premature flame signal or endorse it where the signal is
correct.
light oil pre-heater
Operational all-clear contact
Thermostat or pressure switch
Thermo-electric programmer (bimetal system)
TZ contacts
Flame signal amplifier
Safety thermostat or pressure switch
Ignition transformer
23
Advertisement
