• SIT 503 EFD Control unit -0.503.902 -  USED
  • The 503-EFD control unit is specially designed for the fitting to the gas control blocks SIT 830, 836, 837 TANDEM. 503 EFD is an automatic ignition controller for intermittent operation in accordance with EN 298. 
  • It is used for both atmospheric and fan-assisted boilers, including the dynamic control of the air pressure switch.
  • Voltage [V]: 230
  • Type: DMR
  • Safety time [s]: 5
  • Ambient temperature [°C]: -20 .. 60
  • Manufacturer SIT
  • Manufacturer number 503.902
  • Weight [kg] 0.4
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