Figure 1 - Ycal Air-Cooled Scroll Chillers; Section 2 – Product Description - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017
INTRODUCTION
YORK Millennium® Air-Cooled Scroll Chillers pro-
vide chilled water for all air conditioning applications
using central station air handling or terminal units. They
are completely self-contained and are designed for out-
door (roof or ground level) installation. Each complete
packaged unit includes hermetic scroll compressors, a
liquid cooler, air cooled condenser, a charge of refriger-
ant R-410A 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 packaged unit is pressure-tested,
evacuated, and fully charged with R410A refrigerant
and oil. After assembly, a complete operational test is
performed with water flowing through the cooler to as-
sure 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 (Na-
tional Electric Code), ASHRAE/ANSI 15 Safety code
for mechanical refrigeration, ASME, Listed and labeled
with Intertek Testing Services (ETL) and rated in accor-
dance with ARI Standard 550/590-2003.

FIGURE 1 - YCAL AIR-COOLED SCROLL CHILLERS

JOHNSON CONTROLS
SECTION 2 – PRODUCT DESCRIPTION
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
direction. All rotating parts are statically and dynami-
cally balanced. A large internal volume and oil res-
ervoir provides greater liquid tolerance. Compressor
crankcase heaters are also included for extra protection
against liquid migration.
Evaporator (Heat Exchanger)
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" (19mm) flexible, closed-cell, foam insulation
(K~0.25).
Brazed plate heat exchangers shall be UL (Underwriters
Laboratories) listed. Installing contractor must include
accommodations in the chilled water piping to allow
proper drainage and venting of the heat exchanger. Wa-
ter inlet and outlet connections are grooved for compat-
ibility with factory supplied victaulic connections.
Dual Circuit
2
LD10950
19