Optical Sensor - Rthd Only; Checkout Procedure - Trane RTHD Troubleshooting Manual

Checkout Procedure

CAUTION
Compressor
Damage!
RLC-SVD05A-EN

Optical Sensor - RTHD Only

The oil level detector is located in the oil sump. The sensor uses infrared light
reflected off the inside of a conical prism, back to a detector to sense the
difference in refractive index of the prism /oil interface relative to that of the
prism/vapor interface.
Never perform this test while the compressor is running. Turn the chiller off and
ensure that the compressor will not start.
1 Verify that the wiring between the Optical Sensor on 1A11 J2-1, 2 and 1A3 J3-
1 is correct.
2 Remove the sensor from the oil sump.
Units with a design sequence of A0 to D0, remove the snap ring securing the
sensor in the sump to remove the sensor.
Units with a design sequence of E0to present, unscrew the sensor in the oil
sump to remove the sensor.
Note: The optical sensor is separated from the refrigerant by a clear prism,
therefore, it is not necessary to recover refrigerant when removing the
sensor.
3 Place a mirror or white piece of paper ¼" from the face of the sensor.
4 On the CH530 DynaView read the status of the oil loss sensor.
5 The Oil Loss Level Sensor Status is on the reports tab under the compressor
sub-menu.
6 Place a piece of black electrical tape directly on the face of the sensor. After 10
seconds, the status should read 'WET'
7 If the status does not change, disconnect the sensor leads from the 1A11 J2-1,
2 and 1A3 J3-1. Connect a 1.5 volt battery directly to 1A11 at J2-1 and J2-2.
After 10 seconds, the status should read 'WET'. If so, proceed to Step 7. If the
status still reads 'DRY', the Chiller Module is defective and needs to be
replaced.
8 If the status reads 'WET', connect a 24 VDC power supply to 1A11 at J2-1 and
J2-2. After 10 seconds, the status should change to 'DRY'. If the status does
not change, the 1A11 is defective and needs to be replaced. If the status reads
correctly, the Optical Sensor is defective and needs to be replaced.
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