Issue:
RTHC Liquid Level Sensor Checkout
Resolution:
Use a Voltmeter set to DC Volts:
1. Measure the voltage from terminal J7-1 to J7-3. You should measure between 4.75 and 5.25 VDC.
2. If the measurement is between 4.75 and 5.25 volts, skip ahead to step 6.
3. If the above measurement does not fall between 4.75 and 5.25 VDC, disconnect the sensor from the module and re-measure the voltage at the module.
4. If the measurement with the sensor disconnected is still out of range, the module is defective and should be replaced.
5. If the measurement with the sensor disconnected is in range, the sensor is defective and should be replaced.
6. Measure the voltage from J7-2 to J7-3 on the RTHC Stepper module with the sensor connected.
7. The voltage should measure between 0.5 and 4.5 VDC. If it is not, replace the sensor.
8. Disconnect the sensor, and hook up a 1.5 Volt battery across Stepper module terminals J7-2 (to battery +) and J7-3 (to battery -). View the evaporator liquid level in the Refrigerant Report. The liquid level should read -0.4 inches. Connect the battery to terminals J7-1 (to battery +) and J7-2 (to battery -) The liquid level should read 0.5 inches. If either of these readings is incorrect, replace the RTHC Stepper module.
Facts:
- RTHC (Pueblo)
Document Identifier: DOC-73892
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.