Immergas VICTRIX 75 - Boiler Outputs; Electrical Output Signals; Communication and Display Outputs

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STV75 ed 01/08 VICTRIX 75
Outputs.
It is a unipolar relay for controlling the pump (M1) which is powered when its operation is re-
quested.
Pump relay
(K1)
is is a positive square wave signal with a variable ON-OFF ratio (duty-cycle) that controls the
fan.
With it, it is possible to vary the air ow to the Venturi pipe and hence the pressure of the gas to
the burner.
Fan
(M20)
anks to this signal the boiler’s integrated board is able to communicate with the zones and cascade
regulator.
BUS output
(external optional)
is is a square wave signal detected by a Hall eect probe tted in the fan. It enables the integrated
board to measure fan speed and correct it if dierent from the value required.
Fan speed
With this relay the electric 3-way diverter valve (M30) motor (M) is powered (optional).
It is inactive when there is a d.h.w. request while it is energised with a central heating request.
3-way diverter valve relay
(K2)
It is a 24 V dc signal that indicates energising of the gas valve’s main coils.
Gas valve power supply
(Y1)
It is a high voltage signal (greater than 15 kV) that produces an electric discharge at the ends of the
ignition electrodes on the burner.
Ignition electrode
(E1)
It is a signal that, according to the keys selected, displays the operating values and the boiler error
codes.
Display
To increase the value set.+ key
To reduce the value set.- key
When this contact opens the board is able to nd and display intervention
of the safety thermostat (E4) with an “E12” error code.
Safety thermostat
(E4)
Open = Operation
OFF
Closed = Operation
ON
It is a switch with free contacts that enables operation in the central heating
mode when room temperature is below that requested.
It works on the low voltage circuit.
Room thermostat
(S20)
(external optional)
Open = Central
Heating OFF
Closed = Central
Heating ON
When this contact opens the board is able to nd and display intervention
of the ue thermostat (E6) with an “E12” error code.
Flue thermostat
(E6)
Open = Operation
OFF
Closed = Operation
ON
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