Issue:
High pressure cutout?
Resolution:
High pressure cutout switch opens at 405 psig.
- Verify the saturated condenser and saturated evaporator sensors are working correctly. The chiller uses these sensors to convert temperature to pressure. When the compressors are on, the microprocessor will try to control to a 70 psid (condenser pressure - evaporator pressure).
- Verify the compressor is not starting up loaded (refer to DIAGNOSTIC: Low Oil Flow (code 198 and 199)?) for possible problem with first start syndrome.
- Verify the chiller is not excessively overcharged with refrigerant.
- Check operation of load/unload solenoids using RTAA-SB-4 or RTAA-SVD01A-EN.
Notes: There is NO Schrader underneath the HPC on RTAA chillers
Changes:
Other Question/Problem/Cause Statements:
- High pressure cutout?
- HPC?
- Diagnostic F5?
- Diagnostic F6?
- Diagnostic bE?
- Diagnostic bF?
- Condenser fans dropping out.
- Condenser temperature sensor diagnostic in history
- Bad saturated evaporator refrigerant temperature sensor
- Dirty condenser coils.
- Bad high pressure cutout switch.
- Compressor starting up loaded.
Facts:
- Air-Cooled Chiller (Pueblo) (RTAA 130-400 Ton)
- Air-Cooled Chiller (Pueblo) (RTAA 70-125 Ton)
Document Identifier: DOC-81044
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.