OPERATING AND MAINTENANCE MANUAL
Chapter 8 - Other components
iC 215 ÷ iC 780
57
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited
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8 . 4
E l e c t r o n i c t h e r m o s t a t i c v a l v e ( o p t i o n a l )
The units can be equipped with electronic thermostatic valves (models
iC 303÷iC 780)
.
The electronic thermostatic valve is controlled by the electronic controller, which processes information it receives from the
pressure and temperature transducers.
The electronic thermostatic valve provides rapid and high precision control of superheating, thereby optimising the
efficiency of the unit.
An electronic thermostatic valve adjusts the refrigerant flow rate to the evaporator on the basis of the superheating value
obtained by measuring evaporation pressure and compressor suction temperature. The use of the electronic lamination device
in place of the conventional system makes it possible to operate with significantly lower condensing pressure values (night
time, regions with cold climates, winter season); avoiding the harmful evaporation pressure fluctuations associated with
mechanical control.
8 . 5
P r e s s u r e t r a n s d u c e r s
Certain models are equipped with a high pressure transducer on the refrigerant circuit.
Pressure transducers read the compressors discharge pressure values and control operation of the unit on the basis of the
pressure setpoint values set on the electronic controller.
By means of the values read by these transducers the following functions of each circuit can be provided separately:
•
high pressure alarm;
•
unloading for high pressure;
•
measurement of high pressure values.
Therefore, if pressure in one circuit increases with respect to the preset limit value, an alarm signal can be tripped to stop the
unit or stop one or more compressors after a programmable time interval.