44
ซ.บรมราชชนนี
70
ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม.
10170.
โทร:
02-888-3472
Line ID: @add11 Wechat ID: add0883001122
Mode of operation of the flame safeguards when used for dual-supervision
(detailed connection diagram, e.g.
for oil burners)
LEC1
1 2
6
5
7
13 14
15
3 4
1
6
8
RAR9...
FR
+
9
10
7 5
L1
2
LAE10
3 4
1
6
8
RAR9...
FR
+
9
10
Z
OV1
OV2
L1
7 5
2
LAE10
With this type of supervision,
1
flame is supervised by
2
independently operating flame safeguards, aimed at
reducing the possibility of loss of flame during operation
in case of a simultaneous failure of
both
flame
safeguards to an «improbable 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.
P(R) N(Mp)
7781a01/0908
10/15
Building Technologies Division
CC1N7781en
01.08.2016
