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Mechanical design
LAL...
LAL3.25
Housing
Plug-in base
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.
Flame supervision with QRB1... or QRC1... for blue-flame
burners
Flame supervision with QRB1... or RAR...
Choice of air pressure supervision
Choice of semiautomatic startup
Same as LAL2.25 with the following exception:
No lockout, but prevention of startup in the case of extrane-
ous light
t1
TSA
t3
t3´
t3n
t4
t5
t6
t7
t8
t10
t11
t12
t13
t16
t20
Siemens Building Technologies
HVAC Products
Plug-in design
-
-
Exchangeable unit fuse (including spare fuse)
Difference to LAL1... / LAL2... / LAL4...:
Extraneous light does not initiate lockout
-
– during burner off times
– during the prepurge time
-
Extraneous light prevents burner startup
Made of impact-proof and heat-resistance black plastic
-
-
Lockout reset button with viewing window; located behind it:
– Lockout warning lamp
– Lockout indicator
- coupled to the spindle of the sequence switch
- visible in the transparent lockout reset button
- uses easy-to-remember symbols to indicate the type of fault and the point
in time lockout occurred
-
Base and plug-in section of the LAL... are designed such that only burner controls
of the LAL... family can be plugged in
-
24 connection terminals
-
Auxiliary terminals «31» and «32»
-
3 earth terminals terminating in a lug for earthing the burner
3 neutral conductor terminals
-
– prewired to terminal 2
-
14 knockout holes for cable entry by means of cable glands
– 8 at the side
– 6 in the bottom of the base
-
6 lateral threaded knockout holes for cable entry glands Pg11 or M20
Flash steam generators
From the start ¹)
Optional
Optional
¹)
With air pressure supervision: From the time the air pressure signal is received
Universal use
LAL1.25
LAL4.25A27
LAL2.14
LAL2.25
Special applications such
as incinerator plants
LAL3.25
10 s
22.5 s
4 s
2 s
2.5 s
10 s
8 s
7.5 s
4 s
7.5 s
10 s
2 s
2.5 s
30 s
47.5 s
6 s
10 s
4 s
32 s
Medium- or heavy-oil
burners
LAL2.65
67.5 s
5 s
15 s
15 s
92.5 s
10 s
15 s
5 s
35 s
12.5 s
5 s
2.5 s
15 s
7.5 s
7.5 s
15 s
2.5 s
10 s
15 s
5 s
5/20
CC1N7153en
14.10.2002
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