York YCAV0157, Installation Operation & Maintenance

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JOHNSON CONTROLS
FORM 201.21-NM1 (1223)
Product Description
SECTION 2 - PRODUCT DESCRIPTION
INTRODUCTION
YORK YCAV R134a chillers are designed for water
or glycol cooling. All units are designed to be located
outside on the roof of a building or at ground level.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready for
field installation.
Prior to delivery, the unit is pressure tested, evacuated,
and fully charged with refrigerant and oil in each of the
two independent refrigerant circuits. After assembly,
an operational test is performed with water flowing
through the cooler to ensure that each refrigerant circuit
operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. Many external structural parts are
coated with “Champagne” baked-on enamel powder
paint. This provides a finish which, when subjected
to ASTM B117, 1000 hour, 5% salt spray conditions,
shows breakdown of less than 1/8 in. either side of a
scribed line (equivalent to ASTM D1654 rating of “6”).
All exposed power wiring is routed through liquid-tight,
non-metallic conduit.
General System Description
The Latitude (YCAV) Air Cooled Chiller line combines
the best of modern screw compressor design with the
latest technology in variable speed drives. The result is
superior control and efficiency in real world conditions.
The VSD enables slowing the speed of the compressor to
match the load on the system resulting in precise chilled
liquid control, minimized sound, maximum energy ef-
ficiency, and reduced cost of ownership. The VSD also
provides soft starts with no electrical inrush. The lack
of heat build-up on start also enables required off time
between starts to be reduced to a period of 2 minutes.
The YCAV Air-Cooled Screw Chiller utilizes many
components, which are the same or nearly the same as
a standard screw chiller of a similar size. This includes
modular frame rails, condenser, fans, compressors and
evaporator.
The chiller consists of 2 screw compressors in a corre-
sponding number of separate refrigerant circuits, a single
shell and tube DX evaporator, an air-cooled condenser,
flash tanks, drain/feed valves, oil separators, and com -
pressor mufflers. Oil separators utilize no moving parts
and are rated for a 405 PSIG design working pressure.
Oil cooling is accomplished by routing oil from the oil
separator through several rows of tubes in the air cooled
condenser.
LD10477