Issue:
If the oil optical sensor fails, it can lead to various diagnostics including "Loss of Oil".
Resolution:
RTHC Optical Sensor Checkout
CAUTION: 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 the Chiller Module (1U1) at J9-3, 4, and 5 is correct.
2. Remove the snap ring securing the sensor in oil line. Remove the sensor from the line. 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 over the face of the sensor.
4. On the UCP2 panel, enter the Service Test menu and view the Oil Loss Level Sensor Status. After 10 seconds, the status should read "DRY".
5. Place a piece of black electrical tape directly on the face of the sensor. After 10 seconds, the status should read "WET".
6. If the status does not change, disconnect the sensor leads from the Chiller Module (1U1) at J9-3, 4, and 5. Connect a 1.5 volt battery directly to the Chiller Module (1U1) at J9-3 and J9-4. 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.
7. If the status reads "WET", connect a 24 VDC power supply to the Chiller Module (1U1) at J9-3 and J9-4. After 10 seconds, the status should change to "DRY". If the status does not change, the Chiller Module is defective and needs to be replaced. If the status reads correctly, the Optical Sensor is defective and needs to be replaced.
Notes:
** Reference RTHC-SVD01B-EN for additional troubleshooting
Other Question/Problem/Cause Statements:
- RTHC oil optical eye checkout
Facts:
- RTHC (Pueblo)
Document Identifier: DOC-77083
Document Identifier: 77083
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.