Check Compressor Discharge Sensor
refrigeration
Description
The Compressor Discharge Temperature Sensor is out of range, and the unit gives an alarm only.
Activation Conditions
Compressor Discharge Temperature Sensor (CDT) is not within the range of -40° to +392°F (-40° to +200°C).
Unit Behavior
Engine and Electric Operation: Alarm Only.
Reset Conditions
Auto reset when sensor is in range or, alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Sensor a. Inspect sensor and connector. Verify there is no damage to sensor, and no damage, moisture, or corrosion in connector. b. Check sensor resistance. (Refer to Note 3 in Notes Section) 90,000 Ohms @ 77°F (25°C). Refer to Table 8–6 for chart of resistances for different sensors. 2. Check Sensor Wiring a. Inspect connector pins and terminals 1-3MSM-13 and 25. (See wiring schematic Section 10.2) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors. b. Place the system in PC Mode. Refer to Note 2 in Notes Section Disconnect sensor from harness. Check for 3.0 ± 0.1 VDC volts at harness plug between pins. This verifies microprocessor output and wiring connections to the sensor.