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ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
3. INSTALLATION
To install the controller, proceed as follows, with reference to the connection diagrams shown in the
manual on electrical specifi cations and connections:
1. connect the probes and power supply: the probes can be installed up to a maximum distance of
10 m from the controller, using shielded cables with a minimum cross-section of 1mm². To improve
the immunity to disturbance, use probes with shielded cables (connect only one end of the shield to
the earth on the electrical panel).
2. Program the instrument: for more details, see the chapter “Programming the instruments”.
3. Connect the actuators: the actuators should only be connected after having programmed the
controller. In this connection, carefully check the maximum capacities of the relays, indicated in the
“technical specifi cations”.
4. Serial network connection: all ir33 models are fi tted with a serial connector for connection to the
supervisory network via the serial interface code IROPZ48500. Take care when earthing the system,
in particular the secondary winding of the transformers that supply the instruments must not be
earthed. If connection to a transformer with earthed secondary winding is required, an insulating
transformer must be installed in between. A series of instruments can be connected to the same
insulating transformer, nevertheless you are recommended to use a separate insulating transformer
for each instrument.
Warnings:
Avoid installing the instrument in environments with the following characteristics:
• relative humidity over 90% non-condensing;
• heavy vibrations or knocks;
• exposure to continuous jets of water;
• exposure to aggressive and polluting atmospheric agents (e.g.: sulphur and ammonia gases, saline
mist, smoke) which may cause corrosion and/or oxidation;
• high magnetic and/or radio frequency interference (e.g. near transmitting antennas);
• exposure to direct sunlight and atmospheric agents in general.
The following warnings must be observed when connecting the controllers:
• Incorrect connection of the power supply may seriously damage the system;
• use cable ends that are suitable for the terminals. Loosen every screw and fi t the cable end, next
tighten the screws and gently pull the cables to check their tightness. When tightening the screws, do
not use automatic screwdrivers, or adjust the screws to a tightening torque less than 50 Ncm;
• separate as much as possible (by at least 3 cm) the probe signal and digital input cables from inductive
loads and power cables, to avoid any electromagnetic disturbance. Never lay power cables and probe
cables in the same cable conduits (including those for the electrical panels). Do not install the probe
cables in the immediate vicinity of power devices (contactors, circuit breakers or the like). Reduce the
length of the sensor cables as much as possible, and avoid spirals around power devices;
• only use IP67 guaranteed probes as end defrost probes; place the probes with the vertical bulb upwar-
ds, so as to facilitate drainage of any condensate. Remember that the thermistor temperature probes
(NTC) have no polarity, so the order of connection of the ends is not important.
Cleaning the instrument
When cleaning the instrument do not use ethanol, hydrocarbons (petrol), ammonia and by-products.
Use neutral detergents and water.
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