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Technical Documentation
Functioning button
(S2)
Delivery probe
(B1)
Room thermostat (S20)
(optional)
Flue safety thermostat
(E6)
Overheating safety ther-
mostat
(E4)
Gas valve modulator
(Y2)
STNM ed 07/07
The possible functioning selections are:
= Circuit powered, the antifreeze and antiblock functions
are still active, the post-circulation function is completed.
(
)
= Boiler operation in SUMMER.
(
)
= Boiler operation in WINTER.
It lets the integrated board measure the temperature of the primary
circuit delivery water.
If it breaks the burner stops working both in the central heating
or d.h.w. mode.
It is located at the main exchanger outlet.
It enables operation in the central heating mode when room tem-
perature is below that required.
If this room thermostat is installed the X40 jumper must be re-
moved.
If stack draught is poor it acts on the integrated board stopping
the boiler for 30 minutes.
It is positioned on the right of the draught diverter.
The burner switches off when the safety temperature (105°C) is
exceeded.
It is positioned at the main exchanger outlet.
Loads.
It is powered by the integrated board with a variable continuous current.
It permits varying of the gas pressure to the burner.
23
Technical Documentation
Push Button
NTC probe
10 kohm 25°C
Interrupted
contact
Clicson thermo-
stat with normally
closed contact
Clicson thermo-
stat with normally
closed contact
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