Immergas VICTRIX 75 - Boiler Loads and Circuits; Electrical Loads Overview; Low Voltage Circuit Details

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STV75 ed 01/08 VICTRIX 75
is interrupts power to the transformer (230V/24V) of the low-voltage
circuit when the power input is over 4 A.
It is mounted on the integrated board.
Transformer fuse
230V / 24V
(F3)
4 AT 250 V fuse
Loads.
Depending on the position:
0: - circuit not powered.
ON: - circuit powered.
Main switch
(S1)
2-position switch
Permits water circulation in the primary circuit.ì It is energised by the integrated board following a
central heating or antifreeze request or a domestic hot water request (if the 3-way diverter valve kit
is installed for an external storage tank).
Pump
(M1)
It is powered when the main switch is ON (see integrated board operation).
Integrated board
is is a 230V/24V transformer that powers the low-voltage adjustment circuit.
It is located on the back of the boiler at the bottom right.
Low voltage transformer
(T10)
Low voltage circuit.
Safety devices and controls.
When open (N.O. contact) it enables operation in the central heating
mode. It enables operation in the domestic hot water mode when the
contacts are closed.
Summer switch
(S16)
(not provided to Immergas)
Two-contact switch.
is detects ignition of the burner by whose ame it is covered.
It is connected to the integrated board detection circuit.
Detection electrode
(E2)
It is controlled by the integrated board ignition circuit that produces an electric discharge between
its end and the (blind) earthed electrode. Upon contact the air-gas mix ignites.
Ignition electrode
(E1)
With the main switch S1 ON (closed), if boiler temperature drops be-
low 3 °C, it powers the heating element (optional) wrapped around the
condensate discharge siphon and the adhesive heating element inside the
control panel cover.
Antifreeze thermostat
(optional)
Clixon twin contact
thermostat
ey are powered by the antifreeze thermostat (optional) if boiler temperature drops below 3 °C.
Together with the standard electronic antifreeze, this protects the appliance up to -15 °C.
Anti-freeze elements
(optional)
An external pump can be connected so that it works like the boiler pump (M1).
Maximum input must be 1A.
External pump
(optional)
e fan ensures air ow in the air-gas mixing duct and evacuates the exhaust fumes produced. e
fan is powered by mains voltage (230 V AC).
Fan
(M20)
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