We have three York centrifugal chillers with the following spec
Series YT Codepak
Unit Model YTH3J3E35COG
Capacity 500 Tons
Compressor Model YDTL.126
Starter SSS 26L-50A (LCSSS)
The FLA (Full Load Ampere) of one of the three Chillers does not increase beyond 87% as per the display eventhough there is room for that, (the Chilled Water setpoint is 46, Chilled water entering temperature is 50).
We've checked the level of refrigerant and thats OK. What can be the issue here?