York UL R134A - Manual (Page 6)

JOHNSON CONTROLS 6
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)
Specifications
(Continued )