160
00
PPEERR__SSTTAARRTT
Sets the number of units that will start once the
system has been started
Can be set from 10% to 100%. The percentage
refers to the total number of units ( Slave
units)
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MEE__AADDJJU
USSTT
Sets the time after which the Master unit checks
whether to activate or deactivate a Slave unit
Can be set from 0 to 60 min.
AADDDDRREESSSS RREESSEETT
Sets the address code of a Slave unit.
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The defrosting logic is as follows:
1 all the units ( Slave) simultaneously in
defrosting mode cannot be more than 50% of
the units in operation
2 when a unit is defrosting (including the Master
unit), no other units will start
3 if the Master unit is producing domestic hot
water, it defrosts regularly as if it were not
running in cascade: the Slave units continue the
Heating operations with the logic reported in
point 1
Examples
6-unit system, with 2 units running:
there can be up to 1 unit in defrosting mode
at the same time.
When this unit has completed the defrosting
stage, the next one starts defrosting
6-unit system, with 5 units running:
there can be up to 2 units in defrosting mode
at the same time.
When these units have completed the defrosting
stage, the next 2 start defrosting
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The unit
’
s control system can monitor and display
the operations of the whole system only by
connecting the Master unit to the HMI user
interface.
The Master unit can operate in Cooling / Heating /
DHW / AUTO mode.
The Slave units can only work in Cooling / Heating
mode.
In AUTO mode, the Master unit decides how to
operate based on its T4 probe (room temperature)
and transmits the signal to the Slave units.
The initial number of units is calculated according
to two factors: the % of units that need to turn on
(set on the HMI) multiplied by a coefficient based
on the water delta T (set - output).
After a recurring period of time (set on the HMI),
the Master unit activates or deactivates the Slave
units according to a calculation carried out with the
maximum temperature of the domestic hot water
tank and the water temperature required in
Heating / Cooling mode.
Every 10 seconds the Master unit sends a start
signal to each Slave unit to be operated
Only the Master unit can connect to the domestic
hot water boiler via a 3-way valve and control
domestic hot water.
The 3-way valve and the DHW tank must be
installed in the Master unit piping: do not install the
3-way valve and the DHW tank in the main pipe of
the cascade system.
In case of a DHW request, the Master unit will
operate in DHW mode, while at the same time the
Slave units can operate in Heating or Cooling
mode.
Once the DHW operation ends, the Master unit will
go back to the Heating / Cooling mode.
Only the Master unit can connect to the AHS and
control it (an auxiliary heating source such as a
gas boiler).
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The system counts the hours of operation of the
compressor for all the units (including the main
one).
When the system is started, the units with the
shortest operating time have priority to start.
This way the system rotates the operation of all
the units in order to ensure they are used evenly.
In the event of a unit malfunction, the Master unit
is set up to activate the next one and ensure
continuity of operation.
Note: the Master unit is included in the rotation
logic, but cannot have a backup.
caScade function
