Chiller Control System - City Water Change Over Panel
How can I retro fit a Legacy City Water change over panel to a chiller that was not originaly shipped with one? When a chiller is order with an auto city water change over...

Chiller Phase Reversal - Poor Cooling and Pumping performance
Scroll compressor running but is loud with poor cooling and pumping performance. At startup: This condition commonly occurs at startup. When the chiller is run tested at the...

Chiller Problem - Microprocessor Pressure Transducer Error
Microprocessor shows an “Err” on the top screen and a pressure transducer error code on the bottom screen. Pressure transducer errors include:

"tL1" for compress...

Chiller Problems - HTA alarm on chiller startup
Upon start up, (HTA) hi temp alarm received on micro At the time initial startup, the microprocessor compares the process fluid temperature against the high temp alarm (HTA) set...

Chiller Problems - Microprocessor Low Flow error
Low flow error message on microprocessor controller. Compressor will not run. Micro-Processor "Low Flo" faults can be caused by:

1. Evaporator flow issues relate...

Chiller Problems - Microprocessor Low Pressure error
Low pressure (Lo1 or lo2) error message on microprocessor controller. After power up and compressor start, compressor stops before reaching the SP1 or SP2 set point and the...

Chiller Problems - Water Heating Up
When microprocessor set point (SP1,SP2) is set below 45F, the chiller runs constant and appears to be heating water rather than cooling. Gylcol freeze protection may have been...

Chiller System Microprocessor Error Codes
Effective 1-1-2006 an update was performed on the Legacy microprocessor controller that provides diagnostic information should a temperature or pressure sensor fail. Error codes...

Chiller System Microprocessor Programming
Need to review or update the programming of chillers microprocessor controller When adding glycol to the chiller loop or in some instances during startup or service review or...

Chiller System Problem - Microprocessor 999 error code
Chiller microprocessor controller shows a “999” error code. In some cases the chillers compressor(s) may remain running below the desired set point. A high voltage...

Chiller System Problems - Chiller Won't Start
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 not start. Chiller will...

Chiller System Problems - Excessive Noise
Compressor making excessive noise at startup. Three phase scroll compressor running backwards. Condition normally occurs at initial startup of chiller. Most common cause is the...

Chiller System Problems - HTA & LTA alarms
HTA is indicated on micro display. After 5 seconds or so, the LTA comes on. I cannot change any set points through programming mode either. Also, I have just replaced both...

Chiller System Problems - Micro-processor won't respond
Pressing correct buttons to get into programming mode but the micro-processor won't respond. micro-processor is unable to confirm programming mode access request. If holding the...

Chiller System Problems - Scroll Processor Won't Start
Copeland Scroll compressor will not start. Copeland Scroll compressors, 10 HP and over, are equipped with a solid-state compressor protection module. This devise is mounted within...

Chiller Systems Microprocessor Replacement
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...

Compressor Hot Gas Bypass (HGBP) heating water
When microprocessor set point (SP1,SP2) is set below 45F, the chiller runs constant and appears to be heating water rather than cooling. Gylcol freeze protection may have been...

Copeland Semi-Hermtic Solid State Module Troubleshooting
Copeland Semi-Hermtic compressor will not start Possible issue with Copeland Solid State Compressor Motor Protector Attached article covers operation and troubleshooting...

Glycol - Adding to chiller loop
There are many applications where a chillers process loop has the possibility of freezing by way of (direct or indirect) contact with cold ambient air temperatures or the process...

hi1 or hi2 compressor shut down
Compressor runs for 60 to 120 seconds then shuts down on micro processor hi1 or hi2 pressure trip. Possible issue with liquid line solenoid no fully opening. In rare cases, the...