Technical data

BWR MTD2
21
HFC 410ABWR_MTD2_0011_0121_201110_EN
N-CM CASCADE MANAGEMENT KEYPAD
The N-CM keypad allows cascaded connection of up to 4 heat
pumps to increase capacity delivered in applications with multi-
ple occupied areas, such as hotels, schools, apartment blocks,
offices and shopping centres.
The units are managed in master-slave mode, with the master
unit responsible for processing the information and sending it to
the slave units.
This ensures fine control over the capacity delivered, without
decreasing performance, and more precise system sizing.
NADISYSTEM can determine how many cascaded units are
needed to guarantee domestic hot water production, all or just
one, according to requirements.
The controller also balances compressor operating hours based
on time logic, activating the units in rotation, and where neces-
sary excluding any units that are momentarily out of service,
without interrupting operation of the cascade as a whole.
If the malfunctioning unit is the master, the operating parame-
ters are transferred to another unit in the cascade, thus restor-
ing partial operation.
The N-CM keypad can also display the operation of each heat
pump connected to the cascade and the N-THC room terminals
assigned to the zone in question, up to a maximum of 5 zones.
N-EM1 N-EM1 N-EM1
Zone 1
N-THC
N-CM
master slave slave slave
Zone 2
N-THC
Zone 3
N-THC
Zone 4
N-THC
Zone 5
N-THC
System architecture
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31
156
Dimensions
N-RS RS485 SERIAL CARD
The N-RS is an optional card for directly interfacing the heat
pumps to an RS485 network.
The card guarantees opto-isolation of the controller from the
RS485 serial network.
The maximum baud rate available is 19200 baud.
The optional card is fitted in the comb connector on the unit’s
board.