© 2016
CONTRIVE • B14
88|
QBK
.EN
0219
12
www.contrive.it
PROGRAM SEQUENCE
A
SELF TEST
IS PERFORMED AT POWER-
ON, ONCE SUCCESSFULLY COMPLETED
BURNER IS READY TO S
TART.
IF THE UNIT HAS BEEN
TURNED OFF
WHILE IN
LOCKOUT
OR PARAMETER 101
HAS BEEN SET TO
STANDBY
, IT WILL BE
NECESSARY TO PUSH THE
BUTTON OR
ISSUE A FIELDBUS COM
MAND TO EXIT
FROM NON-
VOLATILE LOCKOUT
.
THE BURNER REMAINS I
N
SHUTDOWN
UNTIL THE THERMOSTAT 1 IS CLOSED OR
A REMOTE RUN COMMAND IS RECEIVED
FROM FIELDBUS.
FLAME SIMULATION
VERIFIED WHILE IN
WAITING OR PREPURGE.
AFTER PRESET
WAITING OR PREPURGE
TIME HAS ELAPSED, IGNITION DEVICE
ACTIVATED AND VERIFIED, THEN THE
PILOT VALVE IS OPEN.
PILOT PROVING STARTS IF THE FLAME IS
DETECTED WITHIN THE
SAFETY TIME
.
IF NO FLAME IS DETECTED WITHIN THE
SAFETY TIME, A LOCK
OUT OCCURS.
DEPENDING ON PARAMET
ER 403 THE
UNIT COULD CARRY OUT UP TO THREE
FURTHER
START-UP ATTEMPTS
.
AFTER THE PILOT PROVING THE MAIN
VALVE OPENS. AT THE END OF 2
ND
SAFETY TIME THE PILOT FUEL VALVE IS
TURNED OFF (INTERRUPTED MODE) OR
REMAINS OPEN (INTERMITTENT MODE).
MAIN VALVE
CONTROLLED BY MEANS
OF THERMOSTAT 2 OR F
IELDBUS.
FLAME FAILURE
DURING OPERATION LEADS TO
LOCK
OUT, IGNITION RESTORATION OR RECYCLE (PARAMETER
504).
AIR FAILURES
DURING OPERATION LEADS TO IMMEDIATE
LOCKOUT OR RECYCLE D
EPENDING ON PARAMETER 507.
SHUTDOWN REQUEST
(THERMOSTAT 1 OR FIE
LDBUS COMMAND) WILL TURN OFF THE BURNER,
WAITING FOR ALLOWED
POSTCOMBUSTION AND O
PTIONAL POSTPURGE. AN OPTIONAL
ADJUSTABLE
MINIMUM COMBUSTION TIME
ENSURES THAT
THE BURNER BURNS FOR
A DEFINED PERIOD, EVEN IF THE THERMOSTAT 1 IS SWITCHED OFF OR AN HALT COMMAND IS
RECEIVED THROUGH FIE
LDBUS BEFOREHAND.
FIRING SYSTEMS OPERATING
ABOVE 750°C
ARE
CONSIDERED TO BE
HIGH TEMPERATURE EQUIPMENT
(SEE EN 746
-2): FLAME
PRESENCE MUST BE VER
IFIED UNTIL THE FURN
ACE IS BELOW 750°C
,
BYPASS REQUEST CAN B
E ISSUED THROUGH A CONTACT AT
TERMINAL 17 (HANDLED
BY
SAFETY TEMPERATURE M
ONITOR, DIN 3440).
RECEIVING A VALID BY
PASS REQUEST, THE INTERNAL FLAME C
ONTROL SYSTEM IS BYP
ASSED AND THE FUEL VALVES ARE
OPENED WITHOUT FLAME SUPERVISION: THE
SYSTEM WORKS
AS USUAL BUT WITHOUT
FLAME MONITORING.
THE BURNER IS TURNED
ON DIRECTLY (NO SAFETY TIME, NO IGNITION TRANSFORMER) WHEN TEMPERATURE IS
ABOVE 750°C.
WHEN THE TEMPERATURE IN T
HE FURNACE DROPS BEL
OW 750°C THE REMOTE
CONTROL MUST BE RELE
ASED.
RESET
A reset action is supposed to be a clear defined manual action. An automatic reset is not allowed by EN 13611:2015.
When manual action is initiated from remote
by means of RESET INPUT at terminal 14 or through the FIELDBUS
CONTROL, without being within the visible sight of the appliance:
actual status and relevant information of the process shall be visible to the user,
QBK limits the m
aximum number of resets to 5 actions within a span of 15 minutes.
Lockout (resettable only from local button) exceeding this limit.