Section 2 - Product Description; Introduction; General System Description; Compressors - York YCAL Series Installation Operation & Maintenance

FORM 150.66-NM3
ISSUE DATE: 09/25/2020

INTRODUCTION

YORK Millennium Air-Cooled Scroll Chillers provide
®
chilled water for all air conditioning applications using
central station air handling or terminal units. They are
completely self-contained and are designed for outdoor
(roof or ground level) installation. Each unit includes
hermetic scroll compressors, a liquid cooler, air cooled
condenser, and a weather resistant microprocessor con-
trol center, all mounted on a pressed steel base.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready
for field installation.
Prior to delivery, the unit is pressure-tested, evacuated,
and fully charged with refrigerant R-410A and includes
an initial oil charge. After assembly, a complete opera-
tional test is performed with water flowing through the
cooler to ensure that the refrigeration circuit operates
correctly.
The unit structure is heavy-gauge, galvanized steel.
This galvanized steel is coated with baked-on powder
paint, which, when subjected to ASTM B117 1000
hour, salt spray testing, yields a minimum ASTM 1654
rating of 6. Corrosion resistant wire mesh panels are
added to protect the condenser coil from incidental
damage and restrict unauthorized access to internal
components. Units are designed in accordance with
NFPA 70 (National Electric Code), ASHRAE/ANSI 15
JOHNSON CONTROLS

SECTION 2 - PRODUCT DESCRIPTION

Safety code for mechanical refrigeration, ASME, List-
ed and labeled with Intertek Testing Services (ETL)
and rated in accordance with ARI Standard 550/590-
2003.
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.

GENERAL SYSTEM DESCRIPTION

Compressors

The chiller has suction-gas cooled, hermetic, scroll
compressors. The YCAL compressors incorporate a
compliant scroll design in both the axial and radial di-
rection. All rotating parts are statically and dynamically
balanced. A large internal volume and oil reservoir pro-
vides greater liquid tolerance. Compressor crankcase
heaters are also included for extra protection against
liquid migration.

Cooler

The Brazed Plate Heat Exchanger is equipped with
a heater controlled by the microprocessor. The heat-
er provides freeze protection for the cooler down to
-20°F (-29°C) ambient. The cooler is covered with
3/4 in. (19 mm) flexible, closed-cell, foam insulation
(K~0.25).
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LD10950
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