Sit control box 0503902

503 EFD ELECTRONIC FLAME CONTROL DEVICE FOR INTEGRAL MOUNTING ON SIT MULTIFUNCTIONAL GAS CONTROL DESCRIPTION Subject to change without notice FEATURES OPERATING SEQUENCE TECHNICAL DATA 9.955.560 01 INSTALLATION w w w . s i t g r o u p . i t  The 503 EFD is an electronic flame safety device for controlling a gas appliance using the principles of flame rectification. The 503 EFD automatic device has been desi- gned for domestic gas appliances with or without a fan in the combustion circuit; with direct ignition or ignition by means of an intermittent pilot in applications which require either non-volatile or volatile lockout. It is also possible to have two separate electrodes for flame ignition and detec- tion or to have these two functions incorporated in a single electrode. The 503 EFD family of products has been specifi- cally designed for fixing on SIT 830, 836 and 837 TANDEM and SIT 822, 826 and 827 NOVA multi- functional controls by means of an exclusive plastic container which integrates itself with the valve body and simplifies connection of the solenoid valves. DESCRIPTION Applications The 503 EFD is an automatic ignition control for applications with intermittent operation in accor- dance with EN298 for: - boilers with natural draught - boilers with forced draught including dynamic control of the air pressure switch. Basic features include: - Compact design - Direct assembly on the gas control - Incorporated igniter with reduced emission of radio disturbances in accordance with the requirements of the EMC directive - Direct burner ignition (DBI) or by intermittent pilot (IP) - Manual reset function and signalling of the non-volatile lockout state either integrated or remote - Multiple plug-in connectors - Utilises well established electronic technology for high reliability of operation - Precise and repeatable timing - Flame detection by ionization - EC 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 low ambient temperatures Options available FEATURES - Fan and air pressure switch control - Single electrode for ignition and flame detection - Reset button and lockout signalling integrated on board - Volatile lockout version for specific applications - 230 Vac output synchronized with flame detection (flame relay contact) - Possibility to connect an automatic safety thermostat in series with the solenoid valve with manual lockout following its operation - Protection against miswiring of the pressure switch contacts - Different flame current sensitivity options may be specified - Protection rating IP44 - Several pre-purge and safety timings can be tailored to the application  Normal operation (natural BOILERS WITH NATURAL DRAUGHT draught or fan assisted) DBI version During the waiting or purge time, Tw or Tp, the unit verifies that EVMV there is no parasitic flame signal present, and that the internal HV 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 “no TW TW TS flow” position. Upon powering the fan, the unit will not begin the operating BOILERS WITH sequence until the N.O. (normally NATURAL DRAUGHT open) or “flow” position is activa- IP version ted on the air pressure switch. After the scheduled waiting time Tw, or purge time Tp, the built-in igniter and the gas valve are EV1 MV energized. This commences the EV2 MV safety time, Ts. The ignition HV spark will ignite the gas and the flame will be sensed by the HV electrode (single probe model) or the detection electrode (dual probe model). Upon sensing the flame, the HV TW TW TS spark will be suppressed and the gas valve will remain energized. When the thermostat is satisfied, the valve and fan are de-energi- FAN ASSIATED BOILERS zed and the control returns to DBI version the stand-by mode. The safety OPERATING time of the 503 EFD has a constant duration in all operating SEQUENCE conditions and, in particular, does not depend on the moment EV MV the pressure switch is switched HV over. P TP TP TS Behaviour under abnormal conditions - If the air proving switch is in the N.O. (normally open) or “flow” position at start-up, 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 air-flow switch after energizing the fan, the control will remain in the waiting mode with the fan energized until the air flow is sensed - Upon flame failure during normal operation, the unit will maintain the power to the fan and start again the ignition sequence with a waiting time (or purge time) followed by a safety time - If no flame is sensed during any part of the safety time, the unit will lockout Resetting the unit To reset the unit the reset switch is depressed. If a first reset is not successful, wait at least 10 seconds before the next attempt. AMBIENT WORKING TEMPERATURE -20 to + 60 °C HUMIDITY 95 % max. at 40 °C SUPPLY VOLTAGE 220/240 Vac - 15 %, + 10 %, 50-60 Hz POWER CONSUMPTION maximum 10 VA for versions without fan maximum 12 VA for versions with fan ELECTRICAL RATINGS Pilot valve or main valve: 230 Vac, 0,5 A, cosϕ≥0,4 Fan: 230 Vac, 1A, cosϕ≥0,4 Flame relay: 230 Vac, 0,5 A, cosϕ≥0,4 Alarm: 230 Vac, 1A, cosϕ=1 ELECTRICAL CONNECTIONS High voltage probe: male fast-on connector 2,8 mm X 0,5 mm Flame detection probe: male fast-on connector 4,8 mm X 0,5 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: 1.5 ... 40 sec. Maximum safety time Ts: 3 ... 120 sec FLAME SENSING Minimum flame current: 0,5... 2,5µA (standard 0,5) Recommended flame current: > 3 times the minimum current FUSING Internal: 4A fast External: 3.15A fast or less depending on the electrical loads. This fuse protects the device in the event of overloading or short circuits and pre- vents the intervention of the internal fuse. IGNITION Ignition voltage: 15 KV at 30 pF load Repetition rate: 1Hz...25 Hz (standard 25) Max. length of the cable: 2 m TECHNICAL Spark gap recommended: 2-4 mm MOUNTING DATA Integrated on SIT 830, 836 or 837 TANDEM and SIT 822, 826, 827 NOVA multifunctional gas controls. DIMENSIONS TANDEM SERIES 58 97 84 121 106 34 37 92 NOVA SERIES 58 106 11 84 105 110 145 48 161 61 18 43 56 18 76  General notes Before installing the 503 EFD read and follow the instructions carefully. Failure to follow the instructions could cause damage to the ignition module or the appliance in which it is installed. Make sure the ratings given in the technical data match the specifications of the appliance. The person installing or replacing the ignition…