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Technical Documentation
System pressure switch
(S5)
External probe (B4)
(external optional)
Flow probe
(B1)
Return probe
(B5)
Domestic hot water probe
(B2)
(optional)
Room thermostat (S20)
(external optional)
Safety thermostat
(E4)
Flue thermostat
(E6)
Fan
(M20)
Display board
BUS output
3-way diverter valve
(M30)
(optional)
Gas valve (Y1)
(main coils)
STV75 ed 01/08
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 off.
It reads the outside temperature and enables the integrated board to change
the system flow temperature according to the temperature outside.
It enables the integrated board to measure the flow water temperature in
the primary circuit.
If it breaks burner operation stops. It is located at the primary exchanger
outlet.
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.
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.
This 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.
When the safety temperature is exceeded (105 °C) this interrupts power
to the main coils of the gas valve.
It is positioned on the flow pipe at the primary exchanger outlet.
When the flue 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 flue hood. The thermostat is mounted on the flue hood
This ensures the flow of air inside the air-gas mixing pipe and the extraction of flue produced by
combustion. It is powered by the electronic integrated board.
Loads.
The boiler can be RESET and its operating values can be set, modified 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.
This output is used for connecting the zones and cascade regulator and the boiler and vice versa (see
the thermoregulation section).
It diverts the primary circuit water flow 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).
It is powered (24 V) by the electronic integrated board when burner ignition is necessary.
It allows passage of gas to the burner.
21
Technical Documentation
Interrupted contact
NTC probe
kΩ
12
25 °C
NTC probe
kΩ
12
25 °C
NTC probe
kΩ
12
25 °C
NTC probe
kΩ
12
25 °C
Interrupted contact
Clixon thermostat
with N.C. contact
Clixon twin contact
thermostat
VICTRIX 75
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