System pressure switch:
The system monitors its high and low pressure by means of serial pressure switches connected with the
clutch. They are constantly monitored by the control board. If a pressure failure happens, the clutch will
be turned off immediately. In this case, the system will acknowledge the failure after 2 seconds and will
start indicating at the display, alternating it with the temperature reading.
As soon as the pressure problem is over, the system will wait for a period of 3 minutes so that the
compressor may be activated again, in case the Automatic Control Mode is activated and the other
conditions have been met.
This alarm is constantly monitored, independently whether the system is on or not. As you may notice,
the alarm may be indicated even if the Automatic Control Mode.
In case this alarm fails 6 or more times within an interval smaller than 30 minutes, the alarm will be
activated, indicating the system presents a serious system failure and blocking air conditioning operation.
The system can operate only in ventilation or heating mode. In order to turn A/C on again, it will be
necessary to turn the vehicle off and then on again
ICE sensor – Freezing of the Evaporator Serpentine
The system presents a device for monitoring the status of the thermostat, which evidences the freezing of
the evaporator serpentine. When such a device is activated (open contact), the compressor clutch is
turned off, and the blowers (evaporator motors) are kept in operation in order to allow the defrosting of
the serpentine.
While the thermostat is activated, the panel will indicate the failure code (ICE), alternating it with the
temperature display. After being defrosted, the thermostat will once again indicate normal operation. The
system waits for 3 minutes and, in case the Automatic Control Mode is still on, the compressor will be
turned on again.
5.8. Pressure switch – ICE sensor
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