Issue:
What can cause carryover?
Resolution:
- Carryover symptoms are very similar to symptoms that would be seen when the circuit is low on refrigerant.
- They are a wide open expansion valve, low liquid level, and flashing in the site glass.
- When troubleshooting carryover problems, the compressor discharge superheat should be measured first.
- This could be done by measuring the discharge pressure, convert the pressure to temperature using a P-T Chart.
- Measure the actual discharge temperature using a thermo-couple (infrared, temperature sensor, etc..) and the difference between the two will be the discharge superheat.
- If the chiller has carryover, the discharge superheat will be very low (1-3F).
- Things to check would be refrigerant overcharge, oil overcharge, liquid level sensor problem and expansion valve problems.
Notes:
If the problem is not found, contact Pueblo Technical Service with the results from the above checks.
Changes:
Other Question/Problem/Cause Statements:
- What can cause carryover?
- Compressor is sweating
- No discharge superheat
- Cold discharge line
Facts:
- Air-Cooled Chiller (Pueblo) (RTAC)
Document Identifier: DOC-83177
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.