T-362 7–44
When performing the Return Air Sensor calibration, disconnect both evaporator motors.
Before proceeding with the calibration procedure, ensure that controller software version is 5368 or
higher and DataLINE version 3.1 or higher is installed onto the download device. Only the latest
DataLINE and controller software will allow users to carry out Good Distribution Practice (GDP)
calibration. Do not downgrade the software after installing the latest software.
Before proceeding with the calibration procedure, it is recommended to check the sensors by running
pre-trip P5-0. This test checks the sensor values. If the test fails, identify and correct the faulty sensor
and rerun the test.
Tools Required:
• Socket screwdrivers set
• Phillips screwdriver
• Standard hand tools
• Interrogator cable
• Laptop with DataLINE 3.1 or above installed
• Clean insulated container for distilled water and ice
• A regularly calibrated reference thermometer, recommended to be of accuracy up to 2 decimal places.
GDP Calibration, Removing Supply Sensors (STS/SRS) from Unit:
1. Locate the supply sensors cover assembly on the suction side of the compressor. Remove the two
fasteners securing the cover of the sensors (see Figure 7.20).
2. Remove the cover and rotate the supply air sensors, STS/SRS, in a clockwise direction and remove the
sensors from the sensor housing (see Figure 7.20).
Figure 7.20 Supply Sensors - Cover Assembly and Sensors
GDP Calibration, Removing Return Sensors (RTS/RRS) from Unit:
1. Remove both front access panels from the unit by removing 8 fasteners from each panel (see Figure 7.21).
Save all hardware for re-installation.
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