Specifications

56 Catalog 602-2
contaminate the refrigerant and chiller system. If any portion of the chiller system is below atmospheric
pressure during either operation or shut down, the manufacturer shall include, at no charge:
1. Purge System
i. A complete purge system capable of removing non-condensables and moisture during
operation and shut-down. The system shall consist of an air cooled condensing unit,
purge condensing tank, pumpout compressor, and control system.
ii. A dedicated condensing unit shall be provided with the purge system to provide a cooling
source whether or not the chiller is running. The condensing unit shall provide a low purge
coil temperature to result in a maximum loss of 0.1 pounds of refrigerant per pound of
purged air.
iii.
The purge system shall be connected to a 100% reclaim device.
iv. A 20-year purge maintenance agreement that provides parts, labor, and all preventative
maintenance required by the manufacturer’s operating and maintenance instructions.
2. Annual Oil/Refrigerant Analysis
i. The manufacturer shall also include at no charge for a period of 20 years an annual oil and
refrigerant analysis report to identify chiller contamination due to vacuum leaks. If the
analysis identifies water, acid, or other contaminant levels higher than specified by the
manufacturer, the oil and/or refrigerant must be replaced or returned to the manufacturer’s
original specification at no cost to the owner.
3. Shell Pressurization System
i. The manufacturer shall include a factory-installed and wired system that will enable
service personnel to readily elevate the vessel pressure during shutdown to facilitate leak
testing.
ii. A factory mounted, wired, and installed shell pressurization system shall be provided to
keep air out of the chiller when the unit is not in service. Electric blanket or hot water
circulation system are both acceptable.
B. Performance: Refer to chiller performance rating.
C. Acoustics: Sound pressure for the unit shall not exceed the following specified levels. Provide the necessary
acoustic treatment to chiller as required. Sound data shall be measured in dB according to AHRI Standard
575 and shall include overall dBA. Data shall be the highest levels recorded at all load points.
Octave Band
63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz
Overall (dBA)
75% Load
50% Load
25% Load
2.4 CHILLER COMPONENTS
A. Compressors:
1. The unit shall utilize magnetic bearing, oil-free, semi-hermetic centrifugal compressors. The
levitated shaft position shall be digitally controlled and shall be monitored by X-axis position
sensor, Y-axis position sensor, and Z-axis position sensor. The compressor drive train shall be
capable of coming to a controlled, safe stop in the event of a power failure by diverting stored
power to the magnetic bearing controls system.