Technical Documentation
Powering the gas valve
(Y1)
Ignition electrode
(E1)
Remote digital control
(CRD)
(optional)
Gas valve modulator
(Y2)
Relay (K4)
Circulator Relay
(K3)
Request Relay
(K2)
3-way valve relay
(K1)
Boiler type selector
(JP1)
STNM ed 07/07
Outputs.
It is a 230 V ac signal indicating that the gas valve's main coils
(Y1) are energised.
It is a high voltage signal (higher than 16 kV) that determines an electrical discharge at the
end of the ignition electrode located on the burner.
This is a (BUS) signal by means of which boiler temperature, operation in the d.h.w. or cen-
tral heating mode and triggered alarm codes can be seen on the remote display panel.
It is a d.c. signal that controls the modulating coil and the pressure of gas to the burner
may be varied according to the output required.
It is a unipolar relay that is excited simultaneously with the K2 relay when its operation
is requested.
It is a unipolar relay for controlling the circulator (M1) that is excited when its operation
is requested.
This is a bipolar relay that is excited when the burner has to be ignited.
Boiler ignition is enabled by means of its contact.
It is a relay by means of which the motor (M) of the electric 3-way valve (M30) is pow-
ered.
It is excited with a central heating request, it remains idle with a d.h.w. request.
Adjustments.
Depending on the position of the jumper together with the "Boiler type" parameter set-
ting, the functioning mode of the type of boiler used can be chosen:
- position 1-2 = bithermal boiler
- position 2-3 = mono-thermal boiler
29
Technical Documentation
230 Vac = coils
energised
0 Vac = coils not
energised
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