304
Thermo E+ 120/200/320 3 Assemblies and components
3.1.2.1 Flame guard
The flameguard monitors the combustion flame condition
during heater operation.
The flame guard is a photo transistor in the control device
that changes its resistance depending on the flame bright-
ness and in this way the applied to it voltage.
The light from the combustion chamber passes through
the dust protection tube into the opening in the housing of
the control device (see also Fig. 304) and thus to the
photo transistor.
The dust protection tube is held by a spring between the
control device and the disc.
Fig. 304 Flame guard
Control device
Dust protection
Spring
Disc
Light from the
combustion
tube
chamber
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