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Installation, Operation and Maintenance Manual - Ed.07/2005
EVOLUZIONE series natural gas/LPG heaters
Figure 1 –
DIAGRAM FOR WINTER OPERATION
Ambient thermostat
closes contact
Blower switches on
After 30 seconds of pre-
wash the electronic
control unit opens the
valve: the green
operation light and the
blower switch on
The detector electrode
determines whether
there is a flame
The combustion
products pass through
the exchangers
internally
The blower ensures
that combustion
products are forcibly
expelled
The differential “air-
gas” valve control
system for combustion
air flow checks that the
blower is functioning
correctly
When the exchangers
are hot, the fan,
controlled by the
ventilation thermostat,
comes on
The flow of air
produced by the fan
strikes the exchangers
externally and is
heated
Have the exchangers
overheated?
The heater works until
the ambient
temperature is reached
The limit thermostat
interrupts the operation
of the burner
Identify cause of
stoppage and reset
heater
Arrest
YES
NO
NO
YES
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