sauter NRT405F901 Instructions

INSTRUCTION
EN
NRT405F901
Instruction for products with software version
i
1.2. Read this instruction before installation and
wiring of the product.
Consult documentation in all cases where this symbol
is used, in order to find out the nature of the potential
hazards and any actions to be taken
Room controller for controlling fan-coil units
NRT405F901 is a room controller intended for controlling fan-coil
heaters/coolers and thermal actuators or 3-point actuators. Installa-
tion is directly on the wall or on an electrical connection box. The fan
can be set to one of three speeds.
NRT405F901 has change-over function and can be used for 2-pipe or
4-pipe systems.
The controller has a function for control of an electric heater.
For integration into a system, NRT405F901 has communication via
RS485 (Modbus or BACnet). The device can be configured using the
application NRT tool (version 1.3-1-05 or later), which can be down-
loaded from the SAUTER ITALIA SPA web site (www.sauteritalia.it).
Technical data
Supply voltage 230 V AC ±10 %, 50/60 Hz
Power consumption < 3 W
Ambient temperature 0...50°C
Ambient humidity Max 90 % RH
Storage temperature -20...+70°C
Built-in temperature sensor NTC type, range 0...50°C
Inputs Refer to connection illustrations and table
below
Outputs Relays for fan control, 230 V AC, 3 A
DO4, DO5 for actuators, Triac, 230 V AC,
max. 300 mA
Communication RS485: Modbus (using automatic detection/
switching) or BACnet
Modbus 8 bits, 1 or 2 stop bits. Odd, even (FI) or no
parity
Communication speed 9600, 19200, 38400 bps (Modbus and
BACnet) or 76800 bps (BACnet only)
Terminal blocks Lift type for a maximum cable area 2.1 mm
Protection class IP20
Pollution degree 2
Overvoltage category 3
Material casing Polycarbonate, PC
Dimensions 102 x 120 x 29 mm
Installation
Place the controller in a location that has a temperature representative for
the room. A suitable location is approx. 1.6 m above floor level in a place
with unobstructed air circulation.
Depress the locking tab in the upper edge of the controller with a
screwdriver. Carefully turn the screwdriver until the bottom plate and the
electronics unit are slightly separated (see figure 1). Then use the cutout
that becomes visible in the edge of the bottom plate to open the upper
edge completely (see figure 2). Do the same thing in the lower edge of the
controller.
Figure 1 Figure 2
Lift the electronics unit up from the bottom plate. The bottom plate with
terminals has a number of hole combinations. Select suitable holes and
fasten the bottom plate on the wall or connection box, so that the arrows
on the bottom plate point upwards. Do not tighten the screws too hard!
NRT405F901
Note: NRT405F901 does not indicate fan breakdown or overheating
of the heating coil. Therefore, all connections must be made exter-
nally. An overheating protection or similar can be used to disconnect
the supply voltage.
Disconnection
NRT405F901 should be connected to a switch or circuit breaker in
the building installation. This switch should be in close proximity to
the controller and within easy reach of the operator, and should be
marked as the disconnecting device for the equipment.
Always use the circuit breaker to disconnect the controller from the
mains supply during maintenance of the fan-coil and actuators.
2
Settings
Control modes
NRT405F901 can control heating and cooling in sequence or be set
to seasonal switching between heating and cooling (change-over, see
below).
Change-over function
NRT405F901 has an input for change-over that automatically resets
the output DO4 to operate with heating or cooling function. When
the controller is used together with a 3-position actuator, output DO5
is also affected by the change-over function in accordance with the
above. A sensor of type PT1000 can be connected to the input and be
mounted so that it senses the temperature on the supply pipe to the
coil.
When the temperature exceeds 28°C, the output function is set to
heating and when the temperature drops below 16°C, the output is
set to cooling. As an alternative, a potential-free contact can be used.
The input function can be set to NO/NC.
To ensure satisfactory functioning when using a sensor, the system
must have continuous primary circuit circulation. When the change-
over function is not used, the input must be left disconnected.
When using an electric heater and the change-over function is set to
heating, the sequence of operation for NRT405F901 will be heating/
heating and DO5 will be activated first.
If a change-over sensor is not connected, the sequence will be heat-
ing/heating. If cooling is to be used in the sequence, parameter 2
(change-over mode) must be changed manually.
Operating mode
There are four different operating modes. Switching between these
modes is performed locally.
Comfort: is shown in the display. Heating and cooling have a
smaller neutral zone NZC. An occupancy detector can be connected
to the DI in order to select between Comfort and Economy. Switching
1