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HEATING : GAS BURNER
GAS BURNER FIRE-UP SEQUENCE
NO
NO
IOM – FLEXY II – 1007 – E
Operation f rom control
Thermostat GAZ =Closed
Supply Thermostat Limit?
(Auto Reset)
YES
Gas Low Pressure switch?
YES
Gas Ignition Control Block Signal
Extraction Fan ON
AIR Pressure Switch ON
Backfire Thermostat ON?
YES
Pre-Ventilation 30 seconds
Fire-up Electrode 4s
Gas Valv e Open
Ionisation 1second after
the end of sparking?
YES
Gas Valv e remains Open
Normal Operation
Air Press Switch ON
or Backfire Thermostat?
YES
Signal from Ionisation
probe still ON?
NO
NO
NO
Gas Control
Valv e Closes
NO
BURNER STOPS
Fault on Gas
Control Block
6 Minutes Delay
Fault on CLIMATIC
YES
Gas Control
Valv e Closes
BURNER
STOPS
Page 55
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