York R134A manual Complete Factory Package

Specifications (Continued)

and schedule, (variable) out of range, remote input indication, chilled liquid reset setpoint, and history data for last ten shutdown faults. Compressor suc- tion, discharge, and oil pressures and temperatures, suction and discharge superheats, percent of full-load, operating hours, starts, and anti-recycle timer status. Status Messages for manual override, unit switch off, compressor run, run permissive, remote controlled shut down, no cooling load, daily/holiday shut down, anti-recycle timer.

•During extreme or unusual conditions (i.e. blocked condenser coils, ambient above scheduled maximum, etc.) the chiller control system will avoid safety shut- down by varying the chiller controls and cooling load output to stay online and avoid safety limits being reached. This allows maximum possible cooling ca- pacity until the unusual condition is cleared and avoids costly shutdowns. The system monitors the following parameters and maintain the maximum cooling output possible without shutdown of the equipment: motor current, suction pressure and discharge pressure.

•System Safeties are provided for individual compres- sor systems to perform auto-reset shut down (manual reset required after the third trip in 90 minutes). Safe- ties include: high discharge pressure or temperature, low suction pressure, high / low motor current, high motor temperature, high pressure switch, high / low differential oil pressure, high oil temperature, low suc- tion superheat, critical sensor malfunction, low or high current, phase loss/single phase power, overload of motor windings, and low voltage.

•Unit Safeties are provided for the chiller to perform auto-reset shut down for the following conditions: high or low ambient, low leaving chilled liquid temperature, under voltage, and flow switch operation.

COMPLETE FACTORY PACKAGE

•These air cooled chillers are shipped as a complete factory package. Each unit is completely assembled with all interconnecting refrigerant piping and internal wiring, ready for field installation:

•Each compressor is installed on its own independent refrigerant circuit, which is factory pressure tested, evacuated, then fully charged with R134a refrigerant and oil.

•After assembly, an operational test is performed with water flowing through the cooler to ensure each circuit operates correctly.

•Unit panels, structural elements, control boxes and

heavy gauge structural base shall be constructed of galvanized steel. Unit panels, control boxes and structural base are finished with a baked on powder paint. All painted surfaces shall be coated with baked on powder paint which, when subject to ASTMB117, 1,000 hour, 5% salt spray test, yields minimum ASTM 1654 rating of “6”.

•Design is IAW applicable sections of ASME Pressure

Vessel Code, NFPA 70 (National Electrical Code), U.L. and cU.L. Standards , and ASHRAE/ANSI-15 Safety

Code for Mechanical Refrigeration.

•Units are Rated (all) and Certified (140 - 200 tons) IAW ARI Standard 550/590-98.

•Design is IAW ASHRAE 90.1 Energy Standard for Building Except Low-Rise Residential Buildings and ARI 70 Sound Rating of Large Outdoor Refrigeration and Air Conditioning Equipment.

•YCIV chillers are designed within EN ISO 9001 and built within an EN ISO 9002 accredited manufacturing organization.

•All exposed power wiring routed through liquid-tight, UV-stabilized, non-metallic conduit.

•When required, chillers have the option available to conform with the following European Directives (50 Hz only):

♦Machinery Directive (89/9/EEC)

♦Low Voltage Directive (7//EEC, EN 600)

♦EMC Directive (89/6/EEC)

♦Pressure Equipment Directive (97//EC)

♦Safety Code for Mechanical Refrigeration (EN78)

JOHNSON CONTROLS