JOHNSON CONTROLS
15
FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
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.
For YLAA0041HE chillers, the compressor’s IP level
cannot meet the specification for outdoor applications.
Individually, both system 1 and system 2 have a com-
pressor enclosure designed to protect the compressors
from rain introduction. It is very critical to keep the
compressor enclosure in complete and good condition.
Do not dismantle the compressor enclosure. The com-
pressor enclosure may need to be dismantled in special
circumstances, such as, to replace the compressor. In
these cases, ensure to set up the compressor enclosure
before you leave the site.
