Operating Principle - REMEHA GAS 360 S Installation And Service Manual

3.4 Operating principle

S4565 BF 1161 safety box
Normal operating cycle
If heating is required, the boiler thermostat TCH 1 closes the contact.
The ignition transformer TA integrated into the safety control box and
the safety flap on the gas valve (supplying the ignition burner) are
switched on.
Operating cycle on safety (start up without flame signal)
- If the flame is not detected before the end of the safety time ts, the
safety control box goes into safety lockout and the safety lockout
warning light comes on.
To restart the heater, press the reset button on the safety box.
- If there is a loss of flame in normal operation, the box automatically
repeats the start up sequence.
- If a flame is present before start-up, the safety control box remains
on standby.
10
The ignition and burner surveillance sequences are ensured by the
safety box.
Gas from the ignition burner is ignited by the ignition electrode and
within the time interval ts; a minimum current of 0.9 µA appears on
the ionization sensor SF and the gas valve regulation flap (supplying
the principal burner) opens.
If, moreover, TCH2 is required, the 2nd stage valve VP2 opens.
GAS 360 S 04/01/11 - 300005180-001-C