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5 0 1   E F D

Electronic Flame 

Failure Device

SIT Group

Summary of Contents for 501 EFD

Page 1: ...5 0 1 E F D Electronic Flame Failure Device SIT Group ...

Page 2: ...5 0 1 E F D DESCRIPTION FEATURES SEQUENCE OF OPERATIONS TECHNICAL DATA INSTALLATION ...

Page 3: ...ller based on the well known and proven rectification effect of flame ionization A suitable design and a special compo nents selection has allowed SIT to obtain a wide temperature range from 20 to 80 C Applications The 501 EFD provides automatic ignition control with non volatile lock out for intermittent operation in accordance with EN 298 for Atmospheric burners Fan assisted boilers including dy...

Page 4: ...nt lock out visualization also without thermostat input Wide range of operating ambient temperature Options available Contact for flame indication relay from the power supply line Fan output and air pressure switch check Potted version Single electrode for ignition and flame detection Different flame current sensitivity can be provided upon request Fast on connectors Several pre purge and safety t...

Page 5: ...ur under abnormal conditions if the air proving switch is in the N O normally open or flow position at startup upon a request for heat the unit will remain in a waiting mode with the fan de energized if air flow is not proven by the airflow switch after energizing the fan the unit control will remain in the waiting mode with the fan energized until the air flow is sensed upon flame failure during ...

Page 6: ...maximum safety time Ts 5 7 10 sec FLAME SENSING minimum flame current 0 5 µA recommended flame current 1 µA FUSING internal 2 A non replaceable external 1 6 A fast The 501 FFD should be externally fused to proctet the unit IGNITION Integral electronic spark generator ignition voltage 15 KV at 30 pF load repetition rate 15 Hz 20 max lenght of the cable 2 m spark gap recommended 2 4 mm MOUNTING No r...

Page 7: ...erm operation mount the 501 EFD in a low ambient temperature and low heat radiation position in the appliance High tempera tures could reduce product life For safety connect a high limit ther mostat in series with the power supply of the unit to de energize the 501 EFD in case of excessive temperatures To suppress radio frequency interference the 501 EFD and spark electrode cabling should be mount...

Page 8: ...e wire must connect the modu le ground terminal to the appliance common ground point The external loads and the burner must be connected to the same com mon ground point High voltage and probe electrodes should be mounted at the burner with a spark gap set according to the elec trical specifications data Flame check The minimum flame ionization current is 0 5µA For a stable flame detection this cu...

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Page 10: ...SIT La Precisa Viale dell Industria 31 33 35129 PADOVA ITALY Tel 049 8293111 Fax 049 8070093 Telex 430130 SITEC I 9 955 552 3 95 ...

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