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7.1.4
Checking burner safety
Close the gas valve.
Check the reaction of the safety system. (Safety box on safety
because of ionization fault).
7.1.5
Checking the safety thermostat
Turn the 3 position switch to TEST STB. The burner starts regardless
of the setting. Keep the switch in this position until the safety
thermostat cuts (110ºC).
To restart the heater, press the safety thermostat reset button and
repeat the starting operations.
7.1.6
Checking the downdraught thermostat
In the event that flue gases overflow via the draught diverter, the anti-
overflow safety system cuts off the electricity supply to the valve and
the boiler goes into safety shutdown.
Check that the anti-overflow system is working correctly on
commissioning for the first time and during annual servicing of the
boiler.
Checking procedure
Only a qualified professional may carry out the check.
Ensure correct ventilation in the premises during the check.
- Turn of the heater and take out the smoke duct linking the heater
to the chimney. Block the boiler flue gas nozzle using a metal plate
(or other heat-resistant material).
- On start up, combustion products are evacuated to the back of the
heater by the anti-blowback device opening inside.
- The downdraught thermostat is tripped after a few moments and
cuts the mains supply to the gas valve. The burner goes out.
- After checking, re-assemble the smoke duct connecting the heater
to the chimney. Wait for around 5 minutes (thermostat cooling
time) and press the reset button on the safety control box.
26
GAS 360 S
04/01/11 - 300005180-001-C
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