© 2000 CONTRIVE • B1401|400.EN
0211
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www.contrive.it
SINGLE STAGE GAS BURNER
When the equipment is used for gas burners, the prescriptions set forth in the European Standard EN298 (including
any further revision) must be completely fulfilled, along with the specific requirements of any National regulation in
force in the Country where the equipment is installed.
Combustion air and optional process limits are controlled by external circuitry.
A complete self test is deployed at power-on and at any reset from lockout, possible failures are reported on the
front panel display. A flame simulation test is carried out during Prepurge.
The gas valve will be activated only if the ignition device is detected (power supply current) during preignition time.
The gas valve remains open during the programmed safety time, if a valid flame signal is detected within the safety
time the valve is kept open: the burner is on and 3 seconds later the contact at terminals 25/26 will be closed.
If no flame is detected the system will lockout and contact at terminals 27/28 will be closed.
Push the front panel button or close the reset input at terminal 23 to reset from lockout (will take place at release).
Flame quenching during burner operation will force the system to lockout, recycle or respark.
There are different options to operate the burner:
switching on/off the power supply;
pressing the front panel button (manual shutdown);
by means of thermostat input (halt);
internal timer (if enabled).
A postcombustion time (max 20 seconds) is allowed after a lockout or shutdown request, followed by pospurge.
The device can stop the burner after programmed auto shutoff time (5m to 20h50m) of continuous operation and
restart again, providing that all the equipment and burner safety tests are successfully performed.
EXTERNAL LIMITS
THERMOSTAT
F
LINE FUSE
RESET INPUT
K
BLOWER POWER RELAY
BURNER LOCKOUT
RT
BLOWER THERMAL PROTECTION
BURNER ON
M
BLOWER MOTOR
DUAL ROD CIRCUIT
PA
LOW AIR PRESSURE SWITCH
UV SENSOR
GAS VALVE
SINGLE ROD CIRCUIT
ALL SAFETY SWITCHES SHOULD BE APPROVED AS LIMIT CONTROLS
THE USE OF ELECTRONIC SWITCHES MAY CAUSE ERRATIC OPERATIONS