York UL R134A User Manual page 6

Specifications
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:
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• Design is IAW ASHRAE 90.1 Energy Standard for
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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
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.
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)
constructed
JOHNSON CONTROLS