Siemens LAL2.25 - Electrical Connection of Flame Detector; Commissioning and Engineering Notes; Commissioning Safety Checks; Engineering Wiring Guidelines

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Building Technologies Division CC1N7153en
21.09.2016
Electrical connection of the flame detector
It is important to achieve practically disturbance- and loss-free signal transmission:
 Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
 Observe the permissible cable lengths (refer to «Technical data»)
Commissioning notes
When commissioning the plant or when doing maintenance work, make the following
safety checks:
Safety check to be carried out Anticipated response
a) Burner startup with flame detector darkened Lockout at the end of safety time (TSA)
b) Burner startup with flame detector exposed to
extraneous light
Lockout after 40 seconds at the latest
c) With wire strap «B»:
Simulation of loss of flame during operation. For that
purpose, darken the flame detector during operation
and maintain that state
Lockout
d) Without wire strap «B»:
Simulation of loss of flame during operation. For that
purpose, darken the flame detector during operation
and maintain that state
Repetition followed by lockout at the end of «TSA»
e)
Burner startup with response of air pressure switch Prevention of startup/lockout during prepurge time
f)
Burner operation with simulated air pressure failure Immediate lockout
Engineering notes
 Install switches, fuses, earthing, etc., in compliance with local regulations
 Connect valves and other plant components as specified in the burner
manufacturer’s documentation
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