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Legend
a
Changeover end switch for air damper's fully open position
AL
Remote lockout warning device (alarm)
AR
Main relay (load relay) with «ar» contacts
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 position check
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
LP
Air pressure switch
LR
Load controller
m
Auxiliary changeover switch for the air damper's MIN position
M...
Fan or burner motor
NTC
Resistor with negative temperature coefficient
QRA...
UV detector
R
Control thermostat or pressurestat
RAR9...
Silicon photocell detector
SA
Actuator of air damper
SB
Safety limit thermostat
Si
External fuse
SM
Synchronous motor of sequence switch
v
In the actuator: Auxiliary changeover switch for release of fuel as a function of the air damper position
V
Flame signal amplifier
W
Limit thermostat or pressure switch
z
In the actuator: End switch for the air damper's fully closed position
Z
Ignition transformer
ZBV
Pilot valve
Valid for expanding flame burners
Valid for interrupted pilot burners with a pilot burner which is shut down after the main burner has ignited
A
Startup
B
Operating position
C
Controlled shutdown
D
End of control sequence
Control signals delivered by the burner control
Permissible input signals
Required input signals:
If these signals are not present at the points in time marked by symbols or during the shaded periods of time, the burner
control will interrupt the startup sequence or initiate lockout
Lockout indication positions when there is no input signal (see Control sequence in the event of faults):
No start
◄
Abortion of startup sequence
▲
Abortion of startup sequence
▼
Lockout (fault in the flame supervision circuit)
■
Lockout (no flame)
1
Lockout (no flame)
2
Lockout (no air pressure)
P
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Building Technologies Division
Infrastructure & Cities Sector
CC1N7785en
06.03.2012
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