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HVAC
21
12. TRINARY PRESSURE SWITCH
Trinary pressure switch is provided on the high
pressure 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 Control panel in case of its intervention.
The operating pressure ranges for the Trinary
pressure 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, besides the air filter.
PIN OUT:
CONNECTION DETAILS
PIN NO
DESCRIPTION
1 -2
MEDIUM PRESSURE
3-4
LOW AND HIGH PRESSURE
-0.03