York MaxE YK, Operating And Maintenance, Page: 6 / 36

YORK INTERNATIONAL
FORM 160.73-O2 (605)
6
electro-mechanical starter, YORK Sol id State Start er
(optional), or Variable Speed Drive (op tion al).
In operation, a liquid (water or brine to be chilled)
fl ows through the evaporator, where boiling refrigerant
absorbs heat from the liquid. The chilled liquid is then
piped to fan coil units or other air conditioning terminal
units, where it fl ows through fi nned coils, absorbing heat
from the air. The warmed liquid is then returned to the
chill er to complete the chilled liquid circuit.
The refrigerant vapor, which is produced by the boil-
ing action in the evaporator, fl ows to the compressor
where the rotating impeller increases its pressure and
tem per a ture and discharges it into the condenser. Water
fl ow ing through the condenser tubes absorbs heat from
the re frig er ant va por, causing it to condense. The con-
dens er water is sup plied to the chiller from an external
SECTION 1
DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
00116vip
CONDENSER
CONTROL
CENTER
COMPRESSOR
MOTOR
EVAPORATOR
FIG. 1 – MODEL YK
MAXE
TM
CHILLER
SYSTEM OPERATION DESCRIPTION (SEE FIG. 2)
The YORK Model YK MaxE
TM
Chiller is com mon ly ap-
plied to large air conditioning systems, but may be used on
other applications. The chiller consists of an open mo tor
mounted to a compressor (with integral speed in creas ing
gears), condenser, evaporator and vari able fl ow control.
The chiller is controlled by a modern state of the art Mi-
cro com put er Control Center that monitors its op er a tion.
The Control Center is programmed by the op er a tor to suit
job specifi cations. Automatic timed start-ups and shut-
downs are also programmable to suit night time, week-
ends, and holidays. The operating status, tem per a tures,
pressures, and other information per ti nent to op er a tion
of the chiller are automatically dis played and read on a
graph ic display. Other displays can be ob served by press-
ing the keys as labeled on the Control Center. The chill er
with the OptiView Con trol Center is compatible with an