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Commissioning, Connecting frequency inverters
Outdoor air temperature sensor (NS120)
Ideally, it should be situated in the outside environment – only
then are the control system's functions ensured even in the
STOP mode or immediately after unit start-up (e.g. moderate
pre-heating of the exchanger based on the actual outside
temperature, etc.). If the sensor is situated in the fresh air
inlet duct inside the building, the measured temperature is
only correct when the fans are switched on (air flows) and
the starting conditions are negatively affected – which can
endanger the air-handling device's safety and even result in
the water heat exchanger breaking down.
Outdoor Temperature Sensor
– installed outside (NS110A)
The sensor (as with any thermometer) must be installed
so that objective outdoor temperature measurement will
be achieved. It must be protected against negative effects
like sunshine, rainfall, frost deposits, e.g. situating it under a
building's roof, using outdoor VZT roofs, situating it in the inlet
louvers, inlet ducts or separate covering roof.
Figure 8 – Room sensor installation
Room Temperature Sensors
Optionally, a room (NS100), duct (NS120) or HMI-SG control-
ler integrated sensor can be used by the designer.
• The room sensor or HMI-SG controller with integrated room
sensor must be situated in a spot "representing" the room tem-
perature, and they must not be affected by local effects (heaters,
windows, vertical temperature distribution in the room, etc.)
• The duct sensor must be situated in the room outlet duct
– the advantage in this is that the average temperature of the
air flowing from the room is measured without being affected
by local effects (and it is hidden).
Heat Exchanger's Antifreeze Protection Sensor
(NS 130R)
The sensor must be situated in the outlet air duct behind the
heat exchanger.
EO Pre-Heating Control Temperature Sensor (NS 120)
To ensure correct control, the sensor must be situated behind
the electric pre–heater (EO) – before other temperature
adjusting components.
Flue Gas Temperature Sensor
The Pt 100 sensor is used to measure the flue gas tempera-
ture. The sensor must be situated in a representative place
within the flue gas installation.
Control units VCS
Inlet Air Humidity Sensor
This is a duct sensor which must always be situated in an inlet
branch after the air-handling unit. The selected position must
be representative enough for the measured value. It must not
be situated in the room.
Room Humidity Sensor
Optionally, a room or duct sensor can be used by the designer.
n
The room sensor must be situated in the room in a "rep-
resentative" place so that it will not be influenced by local
effects (windows, doors, etc.)
n
The duct sensor must be situated in the outlet duct from
the room – the advantage here is that the mean humidity of
the room outlet air is measured.
TH 167 Gas Heating Safety Thermostat
The sensor must be situated before the gas heater section
behind the fan section. The thermostat must be situated so
that it will start the fans to protect the air-handling compo-
nents situated in front of the gas heater chamber if back air
flow occurs.
Air Quality Sensor – CO
2
The air quality sensors are placed in the outlet air duct or in
the "representative" spots, thus ensuring objective air quality
value measuring.
VDK-10 Smoke sensor
The smoke sensor is installed in the piping of the inlet or outlet
branch, depending on the purpose of use. The VDK-10 sensor
must be oriented correctly to the air flow, on the upper or side
straight side of the duct, according to the manufacturer's
installation diagram.
Connection of the fan frequency inverters,
heat exchanger to the Modbus bus
Safety Conditions
n
Properly carried out transport, storage, installation, com-
missioning and careful handling is the main condition for
correct and trouble-free operation.
n
Protection, switching, wire routing and grounding must
fully comply with the local regulations applicable for wiring.
n
The 230/400 V AC power wiring must be strictly separated
from the signal wiring (e.g. 24 V AC SELV)!
Wiring
n
A shielded conductor must be used for the Modbus bus
connection. The maximum conductor length depends on
the communication speed. A maximum length of approx.
1000 m is recommended for the baud rate of 9600 Bd. The
recommended conductors are included in the documentation
created by the AeroCAD design program.
n
The controller is connected to two terminals marked A+
and B- and to the REF signal detection reference voltage
terminal, which must always be interconnected with other
participants on the bus.
n
To ensure correct functioning of the bus, the first and last
device on the bus must be fitted with a terminal resistor.
The first device, i.e. the master controller, terminal resistor
setting is performed using the software (ensured by REMAK
in the factory).
(VOC, CO)
9
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