JOHNSON CONTROLS
15
Form 150.63-NM9
Issue date: 5/20/2021
2
Section 2 – Product description
Introduction
YORK Air-Cooled Scroll Condensing Units are the
perfect refrigeration components for all air condition-
ing applications that use DX central station air han-
dling. They are designed for outside (roof or ground
level) installation. Each unit includes hermetic scroll
compressors, an air-cooled condenser, and a weather
resistant microprocessor control center, all mounted on
a formed steel base.
The unit is pressure-tested, evacuated and given a nitro-
gen holding charge, and includes an initial oil charge.
The R-410A refrigerant is provided by other suppliers.
After assembly, a operational test is performed to en-
sure that each control device operates correctly.
The unit structure is heavy-gauge, galvanized steel.
This galvanized steel is coated with baked-on pow-
der 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 YCUL compressors incorpo-
rate 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.
An annular discharge check valve and reverse vent as-
sembly provides low pressure drop, silent shutdown,
and reverse rotation protection.
Condenser
Coils – Fin and tube condenser coils of seamless, in-
ternally-enhanced, high-condensing-coefficient, corro-
sion resistant copbeforetubes are arranged in staggered
rows, mechanically expanded into aluminum fins. Inte-
gral subcooling is included. The design working pres-
sure of the coil is 650 psig (45 barg).
Low Sound Fans
The condenser fans are composed of corrosion resis-
tant aluminum hub and composite blades molded into
a low noise airfoil section. They are designed for maxi-
mum efficiency and are statically and dynamically bal-
anced for vibration-free operation. They are directly
Figure 1 - YCUL Air-Cooled Scroll Compressor Condensing Unit
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