Immergas VICTRIX PRO 35 2ErP, User Manual

35

3-13

3.16 3-WAY PUMP ANTI-BLOCK 

FUNCTION (OPTIONAL).

The boiler has a function that starts the pump 

and 3-way valve at least once every 24 hours for 

the duration of 20 seconds in order to reduce 

the risk of the pump becoming blocked due to 

prolonged inactivity.

3.17 RADIATORS ANTI-FREEZE 

FUNCTION.

The boiler has a function that makes the pump 

start when the system flow water reaches 8 °C. If 

the system flow water is at a temperature below 

5 °C, the boiler starts to operate until it reaches 

approximately 16 °C.

3.18 ANTI-HUMIDITY ELECTRODE 

FUNCTION.

With cascade installations combined with their 

relative flue manifold kits with flue adjusting 

devices, humidity may develop on the electrodes, 

causing them to fail. Avoid the formation of 

humidity by enabling this function (by setting 

a value other than 0), which turns the fan on 

at the speed set in parameter “P11” (5 minutes 

on and 5 minutes off). The function is active 

when the burner is off and the flow NTC probe 

temperature reading is greater than 35°C. The 

function is disabled when the temperature drops 

below 30 °C.

3.19 INLET 0 ÷ 10 V.

The microprocessor has an analogue 0 ÷ 10 V 

inlet (“Y” and “Z” terminals fig. 1-4) that enables 

the boiler to be controlled from the outside.

By setting the “P37” parameter, it is possible 

to set-up the inlet by choosing the functioning 

mode between temperature set and power set.

The inlet activates a 2 V (minimum) request and 

increases it proportionally up to 9.5 V (max-

imum). The request is deactivated below 1 V.

Notes:

-   If “P37” is set at “0”, it is not active when the 

boiler is in “stand-by” or “summer” mode.

The calculated set is limited by the “P02” ÷ 20 °C 

range. The maximum and minimum temperature 

within the set is limited by “P01” and “P32”.

- If “P37” is set on “1” it is always active.

It is not limited by the “P08” and “P09” param-

eters and does not have priority over the DHW 

request.

-    Input voltage = -2.5 ÷ 12.5 V

-     Input = 200 μA

-     Impedance = > 50 KΩ

3.20 FUNCTIONING WITH COMMON 

FLOW PROBE.

With a hydraulic circuit breaker, there must be 

a common flow probe (with boiler flow probe 

functions) and a pump to be connected down-

stream of the plant.

The probe must be connected to terminals “S1” 

and “S2” and parameter “P38” must be set up, 

whereas the pump must be connected to termi-

nals “C” and “D”.

If there is a DHW circuit, it can be connected 

via an external 3-way to be connected to “IT”, 

“IS” and IK terminal, or use a suitable pump to 

be connected to “IT” and “IK” terminals. The 

DHW circuit has priority over the heating circuit.

Please refer to chart fig. 3-13 for the correct 

configuration

3.21 AUTODETECTION.

This function enables the association of the 

display board to the boiler’s P.C.B. In addition, 

in case of “simple cascade” installation, it enables 

the detection and combination of cascade boilers.

Turn the boiler on, programme it according to 

your needs, press and hold the “-” (fig. 2-1 ref. 2) 

button down until “AUTO” appears, then press 

“RESET” until “bu 1” appears. 

3.22 SIMPLE CASCADE (MAX. 2 

BOILERS)

It is possible to create a “simple cascade” by 

directly connecting two boilers.

The two boilers turn on alternatively based on 

the plant’s requirements.

Carry out the connection as indicated in the 

diagram (fig. 3-6). With this configuration, there 

must be a common flow probe on the thermal 

plant, see the chart (fig. 3-13) for the possible 

options.

In order for the system to recognise the two 

boilers, you must activate the Autodetection and 

make sure both boilers are on.

They are associated when “bu 2” appears on 

the Master boiler and “SLA 2” appears on the 

Slave boiler.

From this moment on, all programming is car-

ried out on the Master boiler, while the “SLA 2” 

caption always appears on the Slave boiler, except 

in case of anomaly.

The customised parameters of the Master boiler 

are automatically replicated on the Slave boiler.

Warning: it is not possible to combine the cascade 

and zone regulator to the plant in this case. It is 

possible to connect an On/Off room thermostat 

or use the 0 ÷ 10 V inlet (which must only be 

connected to the Master) to control the plant.

N° 

boilers   

Parameter “P38”

Parameter “P17”

Common flow 

probe

Boiler flow probe

Common flow probe 

present  = 1

Common flow probe 

absent  = 0

DHW pump (down-

stream the distribu-

tion manifold) = 1

3-way valve = 0 

1

X

X

No

Central heating

Domestic hot water

1

X

X

Central heating

Domestic hot water

1

X

X

Central heating

Domestic hot water

Just as 

limit thermostat

2

X

Not admitted

Central heating

Just as 

limit thermostat

2

X

X

Central heating

Domestic hot water

Just as 

limit thermostat