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faulty, check the supply voltage. It should be 5 vdc ± .5 v. If the supply voltage is correct, the
transducer should be recalibrated or replaced.
Calibration can be checked by comparing the pressure readings from the transducer against
an accurate refrigeration gage. These readings are all viewed or calibrated from the Status01
table on the LID. The transducer can be checked and calibrated at 2 pressure points. These
calibration points are 0 psig (0 kPa) and between 240 and 260 psig (1655 to 1793 kPa). To
calibrate these transducers:
1. Shut down the compressor.
2. Disconnect the transducer in question from its Schrader fitting.
Note: If the cooler or condenser vessels are at 0 psig (0 kPa) or are open to atmospheric pres-
sure, the transducers can be calibrated for zero without removing the transducer from
the vessel.
3. Access the Status01 table, and view the particular transducer reading; it should read 0 psi
(0 kPa). If the reading is not 0 psi (0 kPa), but within ± 5 psi (35 kPa), the value may be
zeroed by pressing the SELECT softkey while the highlight bar is located on the transducer,
and then by pressing the ENTER. The value will now go to zero.
IMPORTANT: Whenever the oil pressure or the cooler pressure transducer is cali-
brated, the other sensor should be calibrated to prevent problems with oil differential
pressure readings.