SYMPTOMS Chillers equipped with variable condenser fan speed control is tripping on high head pressure (Hi1) fault. Condenser fan(s) are not working properly. CAUSE ICM condenser variable fan speed control is not set properly or has been modified from factory settings. Control sensor(s) may not be secured to the proper location. RESOLUTION The attached PDF […]
Chiller System Problems – Scroll Processor Won’t Start
SUMMARY This article provides information as to how to fix a chiller system with a scroll processor that will not start. This problem is most likely due to a problem with the solid-state protection module. SYMPTOMS Copeland Scroll compressor will not start. CAUSE Copeland Scroll compressors, 10 HP and over, are equipped with a solid-state […]
Chiller Systems Microprocessor Replacement
SUMMARY This article describes how to replace the microprocessor in your legacy chiller system. SYMPTOMS After performing a chiller microprocessor controller replacement on a dual state “D Series” chiller the second stage programming functions are not showing up in the programming mode. CAUSE By default, legacy replacement microprocessors are shipped configured for single “S Series” […]
Tank level switch intermittent trips
SYMPTOMS On chillers equipped with a tank level indicator the level switch intermittently indicates tank low when the tank is full or near full. CAUSE Pump cavitation can cause excessive air build up within the level switch (located in the tank) and the built in splash preventer that is part of the switch assembly. RESOLUTION […]
Chiller System Problems – Chiller Won’t Start
SUMMARY This article describes what to do when you cannot get your chiller to properly start. It is most likely caused by a microprocessor problem or microprocessor power. SYMPTOMS Proper high voltage power has been attached to chiller and turned on. There are six LED dots showing in the microprocessor screen however the chiller will […]
Pump mechanical seal leaking
SYMPTOMS Chiller system or tank re-circulation pump is leaking. RESOLUTION The attached PDF provides valuable information on how to confirm if a pumps mechanical seal is leaking. RELATED DOCUMENTS Mechanical seal check
Receiver valves closed
SYMPTOMS Chiller compressor starts and runs, then shuts off after a few minutes of running. Microprocessor controller indicates Low-pressure safety trip. Refrigeration suction pressure is low and head pressure is low. CAUSE In order to meet US Department of Transportation (DOT) requirements during transport, receiver valves on chiller systems equipment with flooded condenser (optional) are […]