JOHNSON CONTROLS
15
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
2
SECTION 2 – PRODUCT DESCRIPTION
INTRODUCTION
YORK YLAA Air-Cooled Scroll Chillers provide
chilled water for all air conditioning applications us-
ing 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 Zero
Ozone Depletion Potential Refrigerant R-410A and
a weather resistant microprocessor control center, all
mounted on a rugged steel base.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready
for field installation.
Before delivery, the packaged unit is pressure-tested,
evacuated, and fully charged with Refrigerant R-410A
and oil. After assembly, a complete operational 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”. Units are designed in accordance with
NFPA 70 (National Electric Code), ASHRAE/ANSI 15
Safety code for mechanical refrigeration, ASME, and
rated in accordance with ARI Standard 550/590.
GENERAL SYSTEM DESCRIPTION
Compressors
The chiller has suction-gas cooled, hermetic, scroll
compressors. The YLAA 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.
Brazed Plate Evaporator
The compact, high efficiency Brazed Plate Heat Ex-
changer (BPHE) is constructed with 316L stainless
steel corrugated channel plates with a filler material
between each plate. It offers excellent heat transfer
performance with a compact size and low weight, re-
ducing structural steel requirements on the job site.
The heat exchanger is manufactured in a precisely con-
trolled vacuum-brazing process that allows the filler
material to form a brazed joint at every contact point
between the plates, creating complex channels. The ar-
rangement is similar to older plate and frame technol-
ogy, but without gaskets and frame parts.
Water inlet and outlet connections are grooved for
compatibility with field supplied ANSI/AWWA C-606
couplings.
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