| Brand | SIEMENS |
| Model | LAL2.25 |
| Voltage | 230V |
| Frequency | 50-60Hz |
| Power | 3.5VA |
| Weight | 500g |
| Other | ts max.5s |
● With or without air pressure supervision for checked air damper control.
● Flame supervision with
-- photoresistive detector QRB1....., or
-- blue-flame detector QRC1....., or
-- selenium photocell detector RAR.....
The LAL2.25 are intended for OEMs which integrate the oil burner controls in their products.
USE
- For the control and supervision of oil atomization burners
- For burners of medium to high capacity
- For intermittent operation (at least one controlled shutdown every 24 hours)
- Can be universally used with multistage or modulating burners
- Suited for use with stationary air heaters
| LAL1... | -Yellow-and blue-flame burners without air pressure supervision |
| LAL2... | -Yellow-flame burners with air pressure supervision |
| LAL3.25 | -For special applications,e.g.burners of incinerator plants (for details,refer to《Type summary》and《Notes》) |
| LAL4... | -Yellow-and blue-flame burners with air pressure supervision |
Warning Note
To avoid injury to persons, damage to property or the environment, the following warning notes should be observed!
Do not open, interfere with or modify the unit!
● Before performing any wiring changes in the connection area of the LAL…,
completely isolate the burner control from the mains supply (all-polar
disconnection)
● Ensure protection against electric shock hazard by providing adequate
protection for the burner control’s connection terminals
● Check to ensure that wiring is in an orderly state and that the wires are
firmly connected
● Press the lockout reset button / operation button only manually (applying a
force of no more than 10 N), without using any tools or pointed objects
● Do not press the lockout reset button on the unit or the remote reset
button for more than 10 seconds since this damages the lockout relay
in the unit
● Fall or shock can adversely affect the safety functions. Such units may not
be put into operation, even if they do not exhibit any damage
Technical Files
● Install switches, fuses, earthing, etc., in compliance with local regulations
● Connect valves and other plant components as specified in the burner
manufacturer’s documentation
| ① | Connect safety limit thermostats (manual reset)in the line (e.g.《SB》) |
| ② | Remote reset When connecting lockout reset button《EK2》between terminals 21 and - 3:For remote reset only - 1:For remote reset and remote emergency shutdown |
| ③ | With LAL...:Required switching capacity of - switching devices connected between terminals 4 and 5(refer to《Technical data》) |
| With LAL2.../LAL3.../LAL4...:Required switching capacity of - switching devices connected between terminal 12 and《LP》(refer to《Technical data》) -《LP》(refer to《Technical data》) |
|
| ④ | When using series connection,the control contacts of other devices contained in the burner plant must be con-nected as follows: |
| To terminal 4 or 5→contacts that must be closed from startup to controlled shutdown→otherwise no startup or shutdown | |
| To terminal 12(not with LAL1...)→contacts that must only be closed on startup→otherwise no startup | |
| To terminal 14(not with LAL¹…)→contacts that must be closed no later than at the beginning of 《t3》or《t3'》and that must remain closed until controlled shutdown occurs→otherwise lockout | |
| ⑤ | Maximum current draw,refer to《Technical data》 |
| ⑥ | 《Z》connected to terminal 15→《t3'》and《t3n》 |
| ⑦ | Connection of《BV...》to terminal 20,refer to《Connection examples》 |
| ⑧ | When using burners without air damper,or with an air damper not controlled and monitored by the LAL...,ter-minal 8 must be connected to terminal 6 |
| ⑨ | Wire link《B》clearly marked on the underside of the LAL.. When wire link《B》is fitted,the LAL.initiates lockout if loss of flame occurs during operation.For repetition of the startup sequence,wire link《B》 on the plug-in section of the LAL..must be cut away.Just cutting is not permitted! |
| ⑩ | For the permissible lengths and laying of detector cables,refer to《Flame supervision》 |
Electrical connection of the flame detector
It is important to achieve practically disturbance-free signal transmission:
● Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate low-capacitance cable
● Observe the permissible cable lengths (refer to «Technical data»)
● Always run high-voltage ignition cables separately, with the greatest
possible dis-tance to the unit and to other cables
Type summary
Switching times are given in the order of the startup sequence, valid for 50 Hz mains frequency. At 60 Hz frequency, switching times are about 17 % shorter.
| Flash steam generators | Universal use | Medium-or heavy-oil burners |
|
| Flame supervision with QRB1...or QRC1...for blue-flame bumers | LAL1.25 LAL4.25A27 |
||
| Flame supervision with QRB1...or RAR.. Choice of air pressure supervision Choice of semiautomatic startup |
LAL2.14 | LAL2.25 | LAL2.65 |
| Same as LAL2.25 with the following exception: No lockout,but prevention of startup in the case of extraneous light |
Special applications such as incinerator plants LAL3.25 | ||
| t1 | 10s | 22.5s | 67.5s |
| TSA | 4 s | 5 s | 5 s |
| t3 | 2 s | 2.5s | 2.5 s |
| t3′ | From the start 1) | ||
| t3n | 10s | 15 s | 15 s |
| t4 | 8 s | 7.5s | 7.5 s |
| t5 | 4 s | 7.5s | 7.5 s |
| t6 | 10s | 15 s | 15 s |
| t7 | 2 s | 2.5s | 2.5s |
| t8 | 30 s | 47.5s | 92.5 s |
| t10 | 6s | 10 s | 10 s |
| t11 | Optional | ||
| t12 | Optional | ||
| t13 | 10 s | 15 s | 15 s |
| t16 | 4 s | 5 s | 5 s |
| t20 | 32 s | 35 s | 12.5s |
Legend
Dimensions
