Siemens LFS1.11A2

44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
website: https://www.add-furnace.com/ โทร: 02-888-3472
Line ID: @add11 Wechat ID: add0883001122
Mode of operation of the flame safeguards with dual supervision (detailed connection diagram, e.g., for oil
burners)
With this type of supervision, 1 flame is supervised by 2
independently operating flame safeguards. The aim is to
reduce the possibility of loss of flame during operation, in
the case of a simultaneous failure of both flame
safeguards, to an unlikely coincidence. With dual
supervision, the control contacts of the flame relays of
both flame safeguards are connected in series so that
loss of the flame signal of either of the flame
safeguards is sufficient to cause lockout of the burner.
A faulty flame signal by only 1 of the 2 flame safeguards
during burner off times or purging times also leads to
lockout.
Z
Key
FR
Internal flame relay
fr1
Flame relay NO contact
fr2
Flame relay NC contact
HR
Internal auxiliary relay (test mode switchover)
hr1
Auxiliary relay NO contact
BV1
1st fuel valve
BV2
2nd fuel valve
RAR9...
Photocell detector
Si
Internal fuse
Z
Ignition transformer
28/40
Building Technologies CC1N7782en 18.04.2018