Discharge Temperature Sensor Check
refrigeration
Description
The Compressor Discharge Temperature Sensor is out of range, and the unit alarms only in Engine and Standby Operation.
Activation Conditions
Compressor Discharge Temperature Sensor (CDT) is not within range of -40° +392°F (-40° to + 200°C).
Unit Behavior
Engine and Standby Operation (Alarm only)
Reset Conditions
Auto reset when sensor is in range or, alarm may be manually reset from the AI, Cabin Tech, or by turning the unit off and then back on again.
Corrective Actions
1. Check Sensor a. Inspect sensor and connectors. Verify there is no damage to sensor, and no damage, moisture, or corrosion in connectors. b. Check sensor resistance c. 90,000 Ohms @ 77°F (25°C). Refer to Table 8–3 for chart of resistances for different sensors. 2. Check Sensor Wiring a. Inspect connector pins and terminals at sensor connector J2-6 and J2- 3. Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors. b. Disconnect sensor from harness (Unit powered ON). Check for 3.0 ± 0.1 VDC volts at harness plug between pins. This verifies microprocessor output and wiring connections to the sensor.