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Legend
a
Changeover end switch for air damper´s OPEN position
AL
Remote lockout indicator (alarm)
AR
Load relay with «ar...» contacts
AS
Unit fuse
B
Wire link
bl
Blue
br
Brown
BR
Lockout relay with «br...» contacts
BV...
Fuel valve
EK...
Lockout reset button
FR
Flame relay with «fr...» contacts
H
Mains isolator
L...
Lockout warning lamp
LK
Air damper
LR
Load controller
LP
Air pressure switch
m
Auxiliary switch for air damper´s MIN position
M
Fan or burner motor
NTC
Resistor with negative temperature coefficient
QRC1... Blue-flame detector
QRB1... Photoresistive detector
R
Control thermostat or pressurestat
RAR...
Selenium photocell detector
Si
External primary fuse
SA
Air damper actuator
SB
Safety limit thermostat
SM
Synchronous motor of sequence switch
sw
Black
v
In the actuator: Auxiliary changeover switch for position-dependent release of fuel
V
Flame signal amplifier
W
Limit thermostat or pressure switch
z
In the actuator: End switch for air damper's CLOSED position
Z
Ignition transformer
Control signals delivered by the LAL...
Permissible input signals
Required input signals:
If these signals are not present during
ate lockout
TSA
Ignition safety time
t1
Prepurge time with air damper fully open
t3
Preignition time, short («Z» connected to terminal 16)
t3´
Preignition time, long («Z» connected to terminal 15)
t3n
Postignition time («Z» connected to terminal 15)
t4
Interval between voltage at terminals 18 and 19 («BV1-BV2»)
t5
Interval between voltage at terminals 19 and 20 («BV2» load controller)
t6
Postpurge time (with «M2»)
t7
Interval between start command and voltage at terminal 7 (start delay time for «M2»)
t8
Duration of startup sequence (excluding «t11» and «t12»)
t10
Only with LAL2... / LAL3... / LAL4...: Interval from startup to the beginning of the air pressure check
t11
Air damper running time to the OPEN position
t12
Air damper running time to the low-fire position (MIN)
t13
Permissible afterburn time
t16
Interval to the OPEN command for the air damper
t20
Not with all LAL...: For self-shutdown of the sequence switch
Building Technologies
HVAC Products
or
, the burner control will stop the startup sequence or initi-
17/20
CC1N7153en
20.04.2005
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