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Technical Documentation
Remote digital control
(CRD)
(optional)
D.h.w. flow switch
(S4)
(for combi versions only)
Flame detection
(E2)
Delivery probe
(B1)
Room thermostat
(S20)
(optional)
Flue safety thermostat
(E6)
STNM ed 07/07
Inputs.
It sends the signals to the board relating to the functioning mode (Stand-by/Summer/
Winter), temperature adjustments (d.h.w. and central heating) and central heating requests
(times, room temperature, etc.).
It indicates an ongoing d.h.w. request.
After domestic hot water has been drawn it enables boiler opera-
tion in the d.h.w. mode which is given priority over the system
heating phase.
This is a signal that indicates the burner flame has been detected.
It allows the board to increase current to the modulating coil (Y2) after having limited it
during the ignition phase.
It keeps the gas valve open (Y1).
It is a resistor that varies in an inversely proportionate way to the
temperature of the primary circuit delivery water.
It is also used as a limit thermostat (90°C).
It is a switch with free contacts that closes a circuit (low voltage)
on the integrated board, enabling operation in the central heating
phase when room temperature is below that requested.
It enables burner ignition by energising the K2 relay when the
fumes are expelled correctly.
If stack draught is poor it acts on the integrated board stopping
the boiler for 30 minutes.
28
Technical Documentation
Closed = d.h.w.
request
NTC probe
10 kohm 25°C
Open = Heating
OFF
Closed = Heating
ON
Open = request
OFF
Closed = request
ON
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