SIT Control box Sit 0579311 replaces 0577311

NE SIT Group W 577 DBC ELECTRONIC BURNER CONTROL DEVICE WITH MICROPROCESSOR FOR INTEGRAL MOUNTING ON SIT SIGMA MULTIFUNCTIONAL CONTROLS Field of application Main features Home gas appliances such Gas burner ignition and Subject to change without notice as boilers (with natural or control functions integrated forced draught including and managed by digital dynamic control of the air technology (microprocessor). pressure switch), water heaters,hot air generators Reference standards and gas radiators. EN 298 with reference to 9.955.841 117 the “Gas Appliance Directive“ (GAD 90/396/EEC). w w w . s i t g r o u p . i t  577 DBC DESCRIPTION AND APPLICATION The 577 Digital Burner Control is a family of electronic devices with integrated functions for the safety and the control of combustion in home gas appliances and has the same functions of 537 ABC family, with which it is interchangeable. The 577 DBC is dedicated in particular to boilers, water heaters and hot air generators with both natural draught and fan assisted burners. All the functions are managed by a microprocessor and the product has obtained the certification of conformity with the most severe safety requirements. The microprocessor structure combines the traditional features of reliability with high flexibility for the needs of the appliance and a wide range of possibilities for further customisation with adds-on such as timers, multiple attempts and so on. The 577 DBC family of products has been specifically designed for fixing on SIT 840, 845 and 848 SIGMA multifunctional controls by means of an exclusive plastic box which integrates itself with the valve body and simplifies the connection of the solenoid valves. Further customisation is easy to achieve thanks to the digital technology. All the hardware and software architecture has been designed by SIT and innovative concepts and technologically advanced solutions have been implemented so as to enhance the device’s reliability and performances. BASIC FEATURES - Compact design - Direct assembly on the gas control - Incorporated igniter with EMC filter - Direct burner ignition (DBI) or by intermittent pilot (IP) - Manual reset function and remote signalling of the non-volatile lockout state - Multiple plug-in connectors - Utilises well established electronic technology for high reliability of operations - Precise and repeatable timings - Multiple ignition attempts - Flame detection by ionization - CE approval according to EN 298 standard - Repetition of the cycle after loss off flame during operation - Permanent lock-out visualization, a without thermostat input being present - Suitable for applications at wide ambient temperature range Options available - Fan and air pressure switch control - Volatile lockout version for specific applications - 230 VAC or optocoupled flame presence signal - Possibility to connect an automatic safety thermostat in series with the solenoid valve with manual lockout following its opening - Different flame current sensitivity options may be specified - Protection degree IP44 - Several pre-purge and safety timings can be tailored to the application. - Different frequency of ignition - Possibility of connection on phase-phase main supply power lines 2  577 DBC OPERATION Normal operation (natural draught or fan assisted) BOILERS WITH During the waiting or purge time, Tw or Tp, the unit verifies that there is NATURAL DRAUGHT DBI version no parasitic flame signal present, and that the internal circuitry is operating correctly. If the unit is used on a fan-assisted application, the air pressure switch is verified to be in the N.C. (normally closed) or MV “no flow” position. VN Upon powering the fan, the unit will not begin the operating sequence until the N.O. (normally open) or “flow” position is activated on the air pressure switch. After the scheduled waiting time Tw, or purge time Tp, the built-in igniter and the gas valve are energized. This commences the TW TW TS safety time, Ts. The ignition spark will ignite the gas and the flame will be sensed by the electrode. BOILERS WITH If there is no flame the system repeats the ignition cycle, after a defined NATURAL DRAUGHT interpurge time, for a definite number of times and it goes definitively on IP version lockout position in case there is no flame. Upon sensing the flame, the HV spark will be suppressed and the gas valve will remain energized. When the thermostat is open, the valve and EV1 fan are de-energized and the control returns to the stand-by mode. The EV2 safety time of the 577 DBC has a constant duration in all operating VN conditions and, in particular, does not depend on the moment the pressure switch is switched over. Resetting the unit TW TW TS To reset the unit the reset switch is depressed for one second at least and then released. FAN ASSISTED BOILERS DBI version EV WIRING DIAGRAM VN P TP TP TS 3  577 DBC TECHNICAL DATA AMBIENT WORKING TEMPERATURE -20 °C to +60 °C HUMIDITY 90 % max at 40 °C (not condensing) SUPPLY VOLTAGE 230 Vac - 15 %, + 10 %, 50-60 Hz POWER CONSUMPTION 20 VA ELECTRICAL RATINGS Gas valves: 230 Vac, 0.5 A, cosϕ≥0.4 Fan: 230 Vac, 1 A, cosϕ≥0.6 Alarm: 230 Vac, 1 A, cosϕ=1 ELECTRICAL CONNECTIONS High voltage probe: male fast-on connector 2.8 x 0.5 mm Flame detection probe: male fast-on connector 4.8 x 0.8 mm Other connections: male Molex series 2599 suitable for female Molex series 3001 and 3002 or compatible. PROTECTION DEGREE Standard IP 40 IP 44 with gaskets TIMING Minimum waiting time Tw or purge time Tp: 1 ... 60 sec. Maximum safety time Ts: 3 ... 120 sec. Ignition attemps 1 ... 10 Relative interpurge time 0 ... 240 sec. FLAME SENSING Minimum flame current: 0.5 µA Recommended flame current: > 3 times the minimum current FUSING Internal: 4 A fast. External: maximum 3.15 A fast or less depending on the electrical loads. This fuse protects the device in the event of overloading or short circuits and prevents the intervention of the internal fuse. IGNITION Ignition voltage: 15 KV at 30 pF load Repetition rate: 25 Hz standard (1 : 50 Hz) Max. length of the cable: 1 m Spark gap recommended: 2-4 mm MOUNTING Integrated on SIT SIGMA multifunctional gas controls. DIMENSIONS- 577 DBC with 845 SIGMA VERSION G3/4 ISO 228 SIT GROUP www.sitgroup.it - e-mail: marketing@sitgroup.it 4