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 - Flooded Condenser Valves
The attached articles provided detailed information on flooded condenser valves used in Legacy sytems designed for low ambient conditions. These articles provide information on...

Chiller Systems - Head Pressure Control Information
Attached article summary:

Condenser capacities are based, in part, on TD (temper-ature difference) between the ambient and the refriger-ant condensing temperature. As...

Chiller Systems - Starting your Chiller
The attached PDF provides copies of factory required startup authorization and startup check list.

NOTE: FAILURE TO PERFORM PROPER STARTUP MAY CAUSE OPERATIONAL DELAYS...

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...

Chiller Systems Recommended Maintenance
The attached PDF article provides factory recommended service items. Note: The schedule provided should be considered as a general guide for service tasks and frequency. In many...

Chiller TECHNET Article - Chiller Systems and Glycol Use
Article covers use of propylene and ethylene Glycols in process chiller applications. Glycol impact on both design and operation of process chiller systems can be dramatic...

Chillers and Data Centers - Greening the Data Center offered by Legacy Chiller Systems
What is a green data center? Data center industry stakeholders are discussing definitions in various consortiums and forums, but a obtainable document is not currently available

Chillers and Data Centers - Increasing Efficiency offered by Legacy Chiller Systems
IT (information technology industry, and data centers operator discussions. The focus has been driven by: Rising data center energy costs, the climate change debate and overall...

Chillers and Data Centers - Increasing Efficiency Plus Reliability offered by Legacy Chiller Systems
Enterprise data centers support the majority of financial and corporate institutions. Normally data centers are required to operate 24/7. These centers typically are operating...

Chillers and Data Centers - Outside Air Economizers offered by Legacy Chiller Systems
Compared to most types of commercial buildings, data centers are energy hogs. A large data center, for example, can easily consume as much electrical power as a small city....

Chillers and Data Centers -Data Centers - Heat Containment offered by Legacy Chiller Systems
Todays data centers are plagued with cool air oversupply and air distribution short-circuiting. Instead of supplying more chilled air, we can use a simpler approach to satisfy the...

Closed Loop Chiller System - Automatic Air Vents
A closed loop chiller system has many operational advantages over an open loop (open vented) system. Engineers and installers must consider automatic air removal when designing...

Closed Loop Chiller System Training by Legacy Chiller Systems
Webinar recorded 6-24-2008 covering closed loop chiller systems advantages and disadvantages. Presented by Legacy Chiller Systems with Panelists from International Chemtex Corp...

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...