Siemens LOA2 Series Manual page 15

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