Cautions - Carel IR32M Manual

Warning:
Before making any electrical installation read the instructions and take careful note of the
diagrams on the following pages. Remember that all safety devices necessary to correct operation must be
fitted in advance.
Installation should be avoided in the following circumstances:
1. Relative humidity greater than 85%.
2. Heavy vibration or shocks.
3. Exposure to continuous water sprays.
4. Exposure to corrosive or pollutant gases (e.g. sulphurous or ammoniacal fumes, saline mist, smoke) so
as to avoid corrosion and oxidisation.
5. Strong magnetic and/or radio interference (therefore installation of the equipment near transmitter aerials
should be avoided).
6. Exposure of controls to direct solar radiation and other climatic influences.
The following must be observed when connecting the controllers:
1. Connecting a power supply of the incorrect voltage can seriously damage the system.
2. Use the correct type of connectors. Slacken each screw, insert the lead and then tighten the screws.
Finally, tug gently to make sure there is a secure grip.
3. So as to avoid any possible electro-magnetic interference, separate as far as possible the signal leads
from the sensors, and the digital inputs from the induction and power leads. Do not place power leads
and sensor leads in the same channels. Furthermore, avoid placing sensor leads in the immediate
vicinity of powered components (thermo-magnetic contacts or others).
Keep the sensor leads as short as possible and avoid their sharing routes with power leads. As defrost
sensors use only guaranteed IP67 sensors; place the sensors with the bulb upright in a position to assist
drainage of any condensation which may occur. Note that thermistor temperature sensors (NTC or PTC)
have no polarity and the terminals may therefore be connected either way.
4. Sensors can be located at distances of up to a maximum of 100 meters from the control. To connect
sensors, leads with a minimum cross-section of 1 square millimetre should be used, and may
screened. In this case the screening should be connected to terminal 7 on the control; it should not be
connected to earth or to any fitting at the other end of the screening (i.e. the end nearer to the sensor).
5. Whatever may be provided for through the IR32SER board, it is necessary to take care when earthing the
system. In particular:
a) the secondary side of transformers supplying the equipment must not be earthed. If it should be
necessary to connect to a transformer which has a secondary earth, an insulating transformer must be
interposed. If necessary, Carel has available an insulating transformer with the following characteristics:
24Vac to 24Vac, 20VA, reference no. 0907651AXX.
b) if several controls are connected to the same transformer, care must be taken with polarity when
wiring: terminals "4" of all controls must all be connected to the same terminal on the transformer;
terminals "5" of the controls must all be connected to the other transformer terminal. See diagram for
further details.
6. Avoid touching with the fingers the electronic components mounted on the boards, so as to avoid
electrostatic discharges from the operator to the components, as these could become seriously damaged.

Cautions

7 Cod. +030220151 - Rel. 2.1 - 04/09/98
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