Issue:
Rotors are spinning after shutdown
Resolution:
It is not unusual for the rotors to spin backwards at shut down for up to a minute. This phenomenon happens while the low and high side pressures of the chiller equalize.
There will be NO damaged caused by this. Since the compressor is stopped, there is no torque being applied, which could cause damage.
The check valves on the discharge line of an RTHC compressor are not designed to be 100% seal-tight. A little bit of backspin is not uncommon. If the the compressor sounds like it is coasting down and slowing down in speed, this is normal. If it sounds like the backspin is powered and does not coast down, this is a problem and needs to be investigated further.
Chiller may sound like it is growling.
Changes:
Other Question/Problem/Cause Statements:
- Rotors are spinning after shutdown.
- Compressor is running (spinning) backwards at shut down. Is this normal?
Facts:
- Water-Cooled Chiller (Pueblo) (RTHC)
- Water-Cooled Chiller (Pueblo) (RTHD)
- RTHC (PUEBLO)
Document Identifier: DOC-80908
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.