Issue:
What should the subcooling be for the RTAC Chiller?
Resolution:
RTAC Chillers:
- In addition to verifying the refrigerant weight against the nameplate charge, the appropriate method for determining the charge of an RTAC is by calculating subcooling.
- Due to the numerous variables involved in determining the correct subcooling level, establishing strict guidelines can be challenging.
- Factors such as ambient temperature, chiller load, coil cleanliness, number of operational fans, compressor capacity, among others, all play a role in subcooling.
- Even if one of these factors remains constant, variations in others will have a significant impact on subcooling levels.
- The enclosed spreadsheet is intended to assist in determining the appropriate subcooling level.
- It is essential to confirm the proper functioning of the pressure transducers. The transducers are located either on a Schrader valve or a service valve. By adding a swivel T below the transducer, you can compare the pressure readings on the panel with those on the gauge.
Other Question/Problem/Cause Statements:
- What should the subcooling be for the RTAC chiller?
- RTAC Subcooling Curves
- Using subcooling to calculate the refrigerant charge
Facts:
- Air-Cooled Chiller (Pueblo) (RTAC)
Original HUB Document: DOC-74458
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.