C2 Check Supply Air Temperature
refrigeration
Description
Compartment 2 Supply Air Temperature Sensor is out of -53 to +158°F (-47 to +70° C), and the unit gives an alarm only.
Activation Conditions
Compartment 2 Supply Air Temperature Sensor (SAT) is not within the range of -53 to +158°F (-47 to +70° C). (NOTE: Compartment 2 Supply Air Temperature Sensor (SAT) is optional and may not be present. If the configuration is set to INSTALLED and the sensor is not connected, this alarm will be active.)
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. Make sure the Configuration Setting (Installed / Not Installed) for SAT2 is correct - Refer to Table 1–1 for Configuration Settings. 2. Check Sensor a. Inspect sensors and connectors. Verify no damage to sensors, and no damage, moisture, or corrosion in connectors. b. Check sensor resistance. (Refer to Note 3 in Notes Section.) 3. Check Sensor Wiring a. Inspect connector pins and terminals at sensor and connector. Verify no physical damage to harness. Verify no damage, moisture, or corrosion in connectors. b. Place the system in PC mode, refer to Section 5.3.2. Refer to Note 2 in Notes Section. Disconnect sensor from harness. Check for 3.0 ± 0.1 VDC at harness plug between pins. Voltage should be 3.0 ± 0.1 VDC at harness plug between pins. This verifies microprocessor output and wiring connections to the sensor.