Issue:
Can the chiller operate with less than the minimum evaporator flow rate?
Resolution:
- It is not advisable to run the chiller with a flow rate lower than the minimum stated in the catalog, IOM, and most importantly the chiller submittal.
- The minimum flows within the IOM and Product Catalog are for a WATER ONLY application. If the chilled water loop has glycol, the minimum flow might be higher. Use the Trane Select Assist (TSA) selection program to identify minimum flow rates with glycol solutions.
- The minimum flow rates are established to keep heat transfer from diminishing quickly when laminar water flow velocities are present in the evaporator. This will result in reduced heat transfer and the chiller could potentially trip off on a low refrigerant temperature or other diagnostic. In order to utilize the heat transfer surfaces most effectively, the velocity through the evaporator tubes has to be fast enough to cause a turbulent flow.
Facts:
- Air-Cooled Chiller (Pueblo) (RTAC)
- Water-Cooled Chiller (Pueblo) (RTHA)
- Water-Cooled Chiller (Pueblo) (RTHB)
- Water-Cooled Chiller (Pueblo) (RTHC)
- Water-Cooled Chiller (Pueblo) (RTHD)
- Air-Cooled Chiller (Pueblo) (CGAM 20-130 Ton)
- Air-Cooled Chiller (Pueblo) (RTAE)
- Air-Cooled Chiller (Pueblo) (RTAF)
- Compressor Chiller (Pueblo) (RTUD 70-200 Ton)
- Water-Cooled Chiller (Pueblo) (RTWD)
Document Identifier: DOC-87330
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.