Immergas VICTRIX PRO V2 - 5 Cascade electrical connections; 5.1 Simple cascade

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5
CASCADE ELECTRICAL CONNECTIONS
e cascade can be managed via communication BUS (cascade and zone regulator and simple cascade) as shown in the diagrams below.
5.1 SIMPLE CASCADE
By connecting several appliances via BUS (already available on individual appliances), a simple cascade can be created. Each request alternates the sequence in which
the appliances are ignited. e amount of activated appliances and their power is managed according to the needs of the system.
For more details see the wiring diagrams on the following pages.
Make the BUS connection as shown in the diagram (Fig. 33).
A system ow probe is required in this conguration, see relative example installation wiring diagrams.
If you want to set a DHW-only hydraulic conguration (DHW pump), the system ow probe must also be set for heating in any case (on the Master unit
see Technician/Hydraulic settings/System probe menu) otherwise error 89 will appear on the display.
e DHW-only setting for the system ow probe can only be implemented with the single unit.
If the system ow probe fails, the system will still function but with reduced performance (the ow probe of the pin appliance is taken as the reference for
cascade operation).
e corresponding error will also be shown on the display.
To avoid wear and tear on the Master appliance, the ignition sequence of the appliances is alternated automatically. e appliance that activates rst in the
sequence is referred to as 'Pin'.
e ignition sequence of the appliances is dierent depending on whether there is a demand for domestic hot water or central heating.
In the case of a central heating demand, the rst appliance is switched on and if necessary (Pin appliance), the others in sequence, running them all at the same power
aer the rst period aer the ignition cycle.
e sequence of switching o the appliances is the reverse of the one just described.
In the case of domestic hot water demand, the system switches on all appliances in rapid sequence, making them all operate at the same power.
e activation/deactivation sequence of the appliances is managed by the control algorithm and the parameters contained in the cascade menu.
Should one or more Slave appliances fail, the Master appliance automatically operates the remaining Slaves. In the event of a fault in the Master unit, simple cascade
operation is not always guaranteed.
However, it is possible (aer modication of the BUS and electrical connections), to assign the role of Master to one of the working Slaves, repeating the auto-detection
function from the 'new' Master appliance.
In order for the system to recognise the appliances in simple cascade (aer the electrical connections have been made), it is necessary to run auto-detection
from the Master appliance (found in the technician/cascade menu).
• Single appliance anti-freeze protection
e boiler anti-freeze protection parameters (see boiler manual), are set by Master and are used by each individual appliance.
Each individual appliance in the cascade can activate its own anti-freeze protection function, which then works independently of the other appliances.
Activation of the anti-freeze protection for one or more appliances is indicated on the Master's main screen as if it were a heating request, while 'Frost protection' appears
in the menu/boiler status.
is protection does not activate the pumps aer the hydraulic circuit breaker but only activates the booster pump.
• Parameter conguration
Parameter customisation should be done from the Master appliance and only aer auto-detection (see section 5.2), with Slave appliances switched on.
During parameter customisation, some parameters are also changed (synchronised) in the Slave appliances (see tables in sections 5.6 and 5.7 Synchronisation column
and paragraph 3.3 under, Single parameter synchronisation). Not all parameters synchronised on the Slaves are used by the Slaves themselves.
An example of parameters synchronised and used on the Slaves are the language and the unit of measurement. ese parameters are not present in the menu of the
Slave appliances, which is why, when changing these parameters on the Master appliance, they are also changed on the Slave appliances.
ese parameters mentioned above (as well as all custom parameters that can be synchronised), can however be updated, and thus synchronised, at a later time (see
paragraph 5.3).
Certain parameters can be changed on each individual Slave.
At the end of parameter customisation on the Slaves, it is normal for the Master appliance to temporarily present error 99.
is is due to the updating of parameters on the Slave appliance (see paragraph Control panel in the boiler manual).