© 2000 CONTRIVE • B1401.EN 0211 8 www.contrive.it
Q101 – START-UP MODE
At power-on, once the self-test has been successfully completed, the unit waits in
STANDBY mode until a reset operation is performed from local push button or
through a fieldbus remote command. Setting AUTOSTART mode, the cycle starts
automatically, unless the units has been turned off while in lockout.
Q305 – PREPURGE TIME
Set prepurge time in forced draught burners according to EN 676 requirements.
Any air valve and/or butterfly valve controlled by external process must be kept
open during the whole prepurge time.
During this time an illegal flame test is carried out.
Q401 – PRE-IGNITION TIME
The ignition transformer is turned on 500 ms before the gas valve to check the
correct operation before to open the gas.
This is a fixed time and cannot be changed.
Q402 – STARTUP SAFETY TIME
Set the correct time following EN 746-2 (or other relevant) requirements:
Natural draught burners ≤ 70 kW → 10” > 70 kW → 5”
IGNITION POWER ≤ 33% NOMINAL POWER WITH MAXIMUM OF 350 KW
Forced draught burners ≤ 350 kW → 5” >350kW→3”
IGNITION POWER ≤ 10% NOMINAL POWER WITH MAXIMUM OF 350 KW
Q507 – OPERATING SAFETY TIME
If the flame fails during operation, gas valve is switched off within this safety time
that must be in accordance with relevant application standards (default for EN 298
is 1” and must not exceed 3” including valves closing time for EN 746-2).
F508 – ALLOWED POST-COMBUSTION TIME
The flame signal is allowed for 20” once gas valve has been closed.
Lockout occurs if the flame is detected after the post-combustion time.
Q509 – AUTO SHUT-OFF TIME
An automatic shutoff is performed after the specified time since burner on.
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