Siemens LOA24.173A27 - Detailed Control Diagrams; LOA26 with Remote Lockout Reset; LOA36 with Remote Lockout Reset

44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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Connection diagram inclusive
Control sequence
internal diagram
LOA26.171B27
L1
x
y
z
c d
e f
g
7 1 1 8 a 0 8 / 1 0 0 4
tz2
tz1
EK1
fr
With ARK21
a
b
FR
K
V
remote lockout
reset module
2
8
TZ
5
9
11
12
1
10
3
7
6
4
SB
W
OW
R
OH
Z
QRB
AL
N
SA
BV1
Si
N
L
M
BV2
N
QRC
b l
sw
10
1
br
2
10
13
EK2
9
14
ARK21A27
7118a09/100 4
LOA36.171A27
L1
x
y
z
c d
e f
g
LED1
tz2
tz1
EK1
fr
With ARK21
a
b
FR
K
V
remote lockout
reset module
L2
TZ
2
8
5
9
11
12
1
10
3
7
6
4
SB
W
OW
R
OH
Z
QRB
AL
N
SA
Si
BV1
N
L
M
BV2
N
QRC
b l
sw
10
1
br
2
10
13
EK2
9
14
ARK21A27
R
A´
A
B
C
D
SB
1
W
OH
8
OW
t3n
3
M
3
tw
t1
Z
6
SA
7
t3
TSA
BV1
4
t4
5
BV2
FS
11
7118d05/0402
12
R
A´
A
B
C
D
SB
1
W
OH
8
OW
t3n
3
M
3
tw
t1
Z
6
SA
7
t3
TSA
BV1
4
t4
5
BV2
FS
11
7118d05/0402
12
Legend
AL
Alarm device
OW
Release contact of oil preheater
BV...
Fuel valve
OH
Oil preheater
EK1
Lockout reset button
QRB…
Photoresistive detector
EK2
Remote lockout reset button
QRC…
Blue-flame detector
FR
Flame relay with contacts «fr»
bl = blue, br = brown, sw = black
fr
Bridging contact for release contact of the oil
R
Control thermostat or pressurestat
preheater
SA
Actuator with automatic setback
FS
Flame signal
SB
Safety limit thermostat
K
Catch of flame relay for locking contact «tz1»
Si
External primary fuse
in the event of premature flame signals or for
TZ
Thermal-electric sequence switch
locking the contact when the flame signal is
tz...
Contacts of the thermoelectric programmer
correct
W
Limit thermostat or pressure switch
L1
Indication of faults (red)
V
Flame signal amplifier
L2
Indication of operation (orange)
Z
Ignition transformer
LED1
Indication of flame strength (green)
M
Burner motor
A´
Beginning of startup with burners using an oil
preheater
TSA
Ignition safety time
A
Beginning of startup with burners without an oil
tw
Waiting time
preheater
t1
Prepurge time
B
Time of flame establishment
t3
Preignition time
C
Running position
t3n
Long postignition time
D
Controlled shutdown by control thermostat /
t3n´
Short postignition time
pressurestat
t4
Interval between flame signal and release of
Control signals delivered by the LOA...
«BV2»
Required input signals
Permissible input signals
15/16
Building Technologies Division
CC1N7118en
19.05.2016