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HVAC
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12. TRINARY PRESSURE SENSOR
Trinary pressure switch is provided on the high pres-
sure tube liquid line of the refrigerant and it is
functionally connected to engine EMS to control the
AC compressor and radiator/ condenser fan through
the Engine EMS. It also gives a feedback to the Con-
trol panel in case of its intervention.
The operating pressure ranges for the Trinary pres-
sure switch is as:
Pressure OFF
ON
DIFF
Low
0.196±0.02
0.226
+0.025
More
than 0.02
Medium
1.47±0.15 1.96±0.12
High
3.14±0.2
(2.55)
0.59±0.2
LOCATION
The pressure switch is located on the high pressure
refrigerant liquid tube.
PIN OUT:
CONNECTION DETAILS
PIN NO
DESCRIPTION
1 -2
MEDIUM PRESSURE
3-4
LOW AND HIGH PRESSURE
-0.03