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Abortion of startup sequence, because auxiliary switch «m» has not delivered
the positioning signal for the low-fire position to terminal 8. Terminals 6, 7 and
14 and, in case LOK16... is used, terminal 15, also remain live until the fault is cor-
rected.
1
Lockout, because no flame signal has been received on completion of the (first)
safety time.
2
Only with LGK16...: Lockout, because no flame signal has been received on
completion of the second safety time (flame signal of the main flame with inter-
rupted pilot burners).
Lockout, because the flame signal has been lost during burner operation or air
pressure failure has occurred.
Only with LOK16...:
If wire link «B» was cut off and the flame is lost during burner operation, the burner
control programs a repetition of the startup sequence with the full program.
a
b´
b
LOK16.140...
LOK16.250...
LOK16.650...
a-b Startup sequence
b-b´ With certain time variants: «Idle steps» of the sequence switch up to the self-
shutdown after burner startup (b´ = operating position of the sequence switch)
b(b´)-a Postpurge sequence after controlled shutdown. In start position «a», the
sequence switch switches itself automatically off or immediately initiates another
burner startup (e.g. after a fault has been cor-rected)
• Duration of safety time with expanding flame burners
• • Duration of safety times with interrupted pilot burners
When lockout has occurred, the burner control can immediately be reset. After reset-
ting, and also after correction of a fault, which resulted in shutdown, or after a mains
failure, the sequence switch always runs to its start position, whereby only terminals
7, 9, 10 and 11 receive power in accordance with the control sequence. It is only
then that the burner control programs a burner restart.
Note: Do not press the lockout reset button for more than 10 seconds.
Connection diagrams
LOK16
A
P
B
C
AS
D
A
1
2
21
3
13
12
14
4
5
6
1(3)
SB
AL
W
LP
R
H
EK2
M1
Si
L
N
Do not press lockout reset button «EK...» for more than 10 seconds!
LGK16
A
P
B
C
D
A
1
2 21
3 13 12 14 4
5
6
7 16
d1
d2
SB
bv...
W
GP
1(3)
R
N
N
H
M1
M2
EK2
Si
AL
LP
L
N
Do not press lockout reset button «EK...» for more than 10 seconds!
1) When used in connection with QRA53../QRA55.., earthing of terminal 22 is man-
datory!
a
a
b´
b
LGK16.122...
LGK16.322...
LGK16.133...
LGK16.333...
LGK16.622...
a
a
b´
b
LGK16.335...
LGK16.635...
z
m
a
7
15
16 17 18
19
20
9
11 10
LR
SA
v
a
z
M
M2
Z
BV1
BV3
BV2
7785a01/0304
z
m a
17
18
19
20
9
11
10 8
LR
SA
z
v
a
m
M
BV1
BV2
BV3
Z
LK
ZBV
BV1
BV2
7785a02e/0604
TSA´, t3´, t4´, only:
LGK16.335
and LGK16.635
Keys
a Changeover end switch for air damper's fully open position
AL Remote lockout warning device (alarm)
AL Remote lockout warning device (alarm)
AS Unit fuse
B Wire link (on the burner control's base)
BR Lockout relay with «br» contacts
BV... Fuel valve
bv... Auxiliary contact in the valve actuator for the fully closed
d... Contactor or relay
EK... Lockout reset button
ION Ionization probe
FR Flame relay with «fr» contacts
FS Flame signal
GP Gas pressure switch
H Mains isolator
L... Lockout warning lamp
LK Air damper
b
LP Air pressure switch
LR Load controller
• Valid for expanding flame burners
•• Valid for burners with a pilot burner which is shut down after the main burner has
ignited
m Auxiliary changeover switch for the air damper's MIN position AL Remote lockout
warning device (alarm)
M... Fan or burner motor
NTC Resistor with negative temperature coefficient
QRA... UV detector
R Control thermostat or pressurestat
b
RAR... Selenium photocell detector
SA Air damper actuator
SB Safety limit thermostat
Si External fuse
SM Synchronous motor of sequence switch
v In the air damper actuator: Auxiliary changeover switch for release of fuel as a fun-
ction of the air damper position
V Flame signal amplifier
W Limit thermostat or pressure switch
z In the air damper actuator: End switch for the air damper's fully closed position
Z Ignition transformer
ZBV Pilot valve
A Startup
B Operating position
C Controlled shutdown
D End of control sequence
Program sequence
LOK16
I
II
III
IV
V
VI
VII
1
VIII
IX
X
XI
8
22
24
XII
+
B
XIII
RAR7...
XIV
m
XV
LK
1
2
22
23 15
1
5
3 4
1
2
+
M
QRA5...
1)
22
24
ION
2
A
t11
t1
t12
a
b
t7
t4
t3
a
b
a
b
a
t3´
a
b
t16
a
b
a
b
a
b
a
TSA
a
b
a
b
a
b
t10
a
b
a
b
a
b
t8
Lockout indication position
P
1
Control output
B
C
D
t6
at terminal:
12
7
19
16
10
9
15
t3n
9
11
20
8
t20
17
18
t5
t13
7785d04e/0604
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