Optical Sensor
RTHC-SVD01B-EN 57
Section 11 Optical Sensor
11-1. General
The oil level detector is located in the lower part of a vertical section of
the oil line feeding the compressor rotors (injection) . In conjunction
with the oil flow differentail pressure switch, it proves that there is both
adequate flow, and that the flow is liquid (as opposed to gas). 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.
11-2. Checkout Procedure
CAUTION
Compressor Damage!
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 the 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 ¼" from the face of the sen-
sor.
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 sen-
sor. 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 sec-
onds, 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.
To Next Page
Loading...
