Immergas VICTRIX 75 - Safety Devices and Controls; Input Signal Devices; Load Outputs

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STV75 ed 01/08 VICTRIX 75
Each time a request is made it detects the pressure inside the boiler cir-
cuit.
If pressure is below 0.3 bar it turns the burner o.
System pressure switch
(S5)
Interrupted contact
It reads the outside temperature and enables the integrated board to change
the system ow temperature according to the temperature outside.
External probe (B4)
(external optional)
NTC probe
12 kΩ 25 °C
It enables the integrated board to read the domestic hot water temperature.
If it breaks the burner stops in the d.h.w. mode.
It must be placed inside a bulb holder against the outside wall of the
storage tank.
Domestic hot water probe
(B2)
(optional)
NTC probe
12 kΩ 25 °C
is enables operating in the heating mode when room temperature is
below that requested.
If thermoregulating devices are installed, the room thermostat must be
disconnected without re-establishing the existing jumper X40.
Room thermostat (S20)
(external optional)
Interrupted contact
Loads.
e boiler can be RESET and its operating values can be set, modied and stored with the keys.
By means of a Display and depending on the keys selected, it displays the boiler’s operating values
and the error codes.
Display board
is ensures the ow of air inside the air-gas mixing pipe and the extraction of ue produced by
combustion. It is powered by the electronic integrated board.
Fan
(M20)
When the safety temperature is exceeded (105 °C) this interrupts power
to the main coils of the gas valve.
It is positioned on the ow pipe at the primary exchanger outlet.
Safety thermostat
(E4)
Clixon thermostat
with N.C. contact
It is powered (24 V) by the electronic integrated board when burner ignition is necessary.
It allows passage of gas to the burner.
Gas valve (Y1)
(main coils)
It diverts the primary circuit water ow from the central heating system to the d.h.w. exchanger
(e.g. storage tank) and vice versa.
It is powered by the electronic integrated board (24 V).
3-way diverter valve
(M30)
(optional)
is output is used for connecting the zones and cascade regulator and the boiler and vice versa (see
the thermoregulation section).
BUS output
It enables the integrated board to measure the ow water temperature in
the primary circuit.
If it breaks burner operation stops. It is located at the primary exchanger
outlet.
Flow probe
(B1)
NTC probe
12 kΩ 25 °C
It enables the integrated board to measure the return water temperature
in the primary circuit.
If it breaks burner operation stop. It is located at the primary exchanger
inlet.
Return probe
(B5)
NTC probe
12 kΩ 25 °C
When the ue safety temperature is exceeded (90 °C) this interrupts power
to the main coils of the gas valve. It is placed on the condensation module
close to the ue hood. e thermostat is mounted on the ue hood
Flue thermostat
(E6)
Clixon twin contact
thermostat
Technical Documentation
Technical Documentation