C.I.B. UNIGAS
- M03956CR
29
OPERATION
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Turn to the ON position the mains switch A on the burner front panel.
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Check the flame control box is not in the lockout position (light B on), if necessary reset it by means of the pushbutton C (reset);
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Check that the control thermostats or pressure switches enable the burner to operate.
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Check the gas supply pressure is sufficient (light D on), if necessary, adjust the pressure switches.
Only burners provided with the gas proving system:
the check cycle of the gas proving system starts; the end of this check is
signalled by the light of the lamp on the device. When the valves check is finished, the startup cycle of the burner begins. In the case of
a leak in a valve, the gas proving system locks and the lamp E lights. To reset the device press the device pushbutton.
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The startup cycle begins, the actuator drives the air damper to the maximum opening position, the fan motor starts and the pre-pur-
gue phase begins. During the pre-purgue phase, the complete opening of the air damper is signalled by the lamp F on the frontal panel
of the electrical board.
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At the end of the pre-purgue phase, the air damper goes to the ignition position, the ignition transformer turns on (signalled by the
lamp H) and few seconds later the solenoid valves EV1 and EV2 are energized (lights I and L on the front panel).
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Few seconds after the opening of the valves, the ignition transformer turns off and the lamp H turns off subsequently:
Double-stage burners:
the burner is on in low flame stage (light G is on); some seconds later, the high flame operation begins and the
burner switches automatically to high flame (light F is on) or remains in low flame operation, accordign to the plant requests.
Progressive and fully modulating burners
- few seconds after the gas valve opening, the ignition transformer is de-energized. The
burner is in low flame operation and some seconds later, the two-stages operation begins; the burner increases or decreases its output,
directly driven by the external thermostat (progressive version) or by the modulator (P in Fig. 25, fully modulating burners only).
.ATTENTION: BEFORE STARTING THE BURNER UP, BE SURE THAT THE MANUAL CUTOFF VALVES ARE OPEN
AND CHECK THAT THE PRESSURE VALUE UPSTREAM THE GAS TRAIN MATCHES THE VALUE ON PARAGRAPH
“TECHNICAL SPECIFICATIONS”). CHECK THAT THE MAINS SWITCH IS CLOSED. CAREFULLY READ THE “WAR-
NINGS” CHAPTER.
VPS504
LC
LB
