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DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
COMPRESSOR
CONTROL
CENTER
COOLER
FIG. 1 – MODEL YK CODEPAK CHILLER
SYSTEM OPERATION DESCRIPTION (See Fig. 2)
The YORK CodePak is commonly applied to large air
conditioning systems, but may be used on other appli-
cations. The CodePak consists of an open motor moun-
ted to a compressor (with integral speed increasing
gears) condenser, cooler and flow control chamber.
The CodePak is controlled by a modern state of the art
MicroComputer Control Center which monitors its op-
eration. The Control Center is programmed by the op-
erator to suit job specifications. Automatic timed start-
ups and shutdowns are also programmed to suit
nighttime, weekends, and holidays. The operating sta-
tus, temperatures, pressures, and other information
pertinent to operation of the CodePak Chiller are auto-
matically displayed and read on a 40 character al-
phanumeric message display. Other displays can be
observed by pressing the keys as labeled on the Con-
trol Center. The CodePak with the MicroComputer Con-
trol Center is applied with an electro-mechanical starter
or a factory packaged YORK Solid State Starter (op-
tional).
YORK INTERNATIONAL
SECTION 1
MOTOR
27073A
OIL PUMP
STARTER
SUB COOLER
OIL RESERVOIR/
PUMP
In operation, a liquid (water or brine to be chilled) flows
through the CodePak cooler, where boiling refrigerant
absorbs heat from the water. The chilled liquid is then
piped to fan coil units or other air conditioning terminal
units, where it flows through finned coils, absorbing
heat from the air. The warmed liquid is then returned to
the CodePak to complete the chilled liquid circuit.
The refrigerant vapor, which is produced by the boiling
action in the CodePak cooler, flows to the compressor
where the rotating impeller increases its pressure and
temperature and discharges it into the condenser. Wa-
ter flowing through the condenser tubes absorbs heat
from the refrigerant vapor, causing it to condense. The
condenser water is supplied to the CodePak from an
external source, usually a cooling tower. The condensed
refrigerant drains from the condenser into the flow con-
trol chamber, where the flow restrictor meters the flow
of liquid refrigerant to the cooler to complete the refrig-
erant circuit.
The major components of a CodePak are selected to
handle the refrigerant which would be evaporated at
FORM 160.49-O1
DISCHARGE LINE
PRE-ROTATION
VANE
ACTUATOR
OIL
CONDENSER
COOLER
25717A
3
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