York YLUA0248 Series, Installation Operation & Maintenance

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JOHNSON CONTROLS
15
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
2
SECTION 2 – PRODUCT DESCRIPTION
INTRODUCTION
YORK Millennium
®
Air-Cooled Scroll Condensing
Units can be used 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 unit in-
cludes hermetic scroll compressors, a liquid cooler, air
cooled condenser, and a weather resistant microproces-
sor control center, all mounted on a pressed steel base.
The 70-130 Ton (245 - 475 kW) YLUA Condensing
Unit Models are shipped complete from the factory
ready for field installation.
The unit is pressure-tested, evacuated and given a ni-
trogen holding charge and includes an initial oil charge
(R-410A refrigerant supplied by others). After assem-
bly, a operational test is performed to assure that each
control device 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 Elec tric Code), ASHRAE/ANSI 15
Safety code for mechanical refrigeration, and are cETL
listed. All units are produced at an ISO 9000-registered
facility.
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.
GENERAL SYSTEM DESCRIPTION
Compressors
The condensing unit has suction-gas cooled, hermetic,
scroll compressors. The YLUA compressors incor-
porate a compliant scroll design in both the axial and
radial direction. All rotating parts are statically and
dynamically balanced. A large internal volume and oil
reservoir provides greater liquid tolerance. Compres-
sor crankcase heaters are also included for extra pro-
tection against liquid migration.
FIGURE 1 - COMPRESSORS