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MS2: regulation of the supply fan in winter mode.
MS3: regulation of the exhaust fan.
N.B.
In order to keep noise reduction, it is necessary that the air speed in the duct system does never exceed 4 m/sec. In
addition, with high crossing speed the dehumidification capacity of the unit is extremely reduced and the risk of dragging
the condensation water in the air channels increases with a possible damage to the furnitures and / or the floors.
How to connect the power supply
(For details of the electrical connections, please refer to the specific paragraph)
To supply power to the HRI DH units, remove the front panel; use the appropriate cable gland in the panel and connect the
power supply cable to the terminal board on the electrical panel.
After connection, close the front panel firmly. (fig.13).
Serial interface circuit board RS485 (INSE)
Serial circuit board for interfacing to the supervisory system (available only the supervisory system MODBUS-RS485)
The PCB installation will allow the unit to be connected to a system with protocol MODBUS-RS485. This system allows to
remotely monitor all operating parameters of the unit and change its values. The serial interface circuit board is normally
assembled in the factory, in case it is supplied separately it is necessary to respect the polarity of the wiring as shown in
the diagram. The eventual inversion of the polarity determines the non operation of the unit. The connection cable of the
supervision will be the telephone one, type 2x0,25 mm2. The unit is configurated in the factory with serial address 1. In
case of use of the MODBUS system, it is possible to ask for the list of variables contacting the assistance support.
ENGLISH
L
N PE
13
13
14
14
CAVO TELEFONICO
CAVO DI CONNESSIONE
CON SCHEDA UNITA’
SCHEDA DI
INTERFACCIA SERIALE
ELECTRIC WIRE
SERIAL INTERFACE PCB
CONNECTION CABLE
WITH UNIT PCB
