GA Southwestern State University

Pre-Cool System installation

SUMMARY

Address problems with a Carrier Air Cooled Chiller at Georgia Southwestern State University

Machine has had multiple compressor failures

Extremely high Liquid Line and condensor coil temperatures

Unable to meet setpoints for AC

EQUIPMENT

Carrier GT 100

ISSUES Three compressor replacements in 18 months Liquid line temps exceeding 130° Condensor temps over 100° Unable to run more than 3 of the 4 compressors due to

cutting off on high head pressures Recirculation of condensor exhaust through condensor

addressed with sheet metal flashing diverters (pic below)

Before Installation

After Installation

Controls and Water treatment

RESULTS DAY ONE

Drop of 10° in Supply Chilled Water temp. (From mid 50’s to mid 40’s)

Return Chilled water temps in mid 50’s Prior room temps between 77-80. After install temps

at 68-71. All four compressors running and cycling Drastic reduction in compressor noise due to reduced

head pressures

ADDITIONAL

Head temps and chilled water supply temps will be trended and monitored

Additional chillers at site will be selected for future installations

Follow-up with customer to address any post installation issues

CCONTACTONTACT I INFONFO