York OPTIVIEW, Operation Manual, Page: 9 / 162

JOHNSON CONTROLS
9
FORM 160.78-O2
ISSUE DATE: 5/22/2017
1
The chiller is controlled by a modern state of the art
Microcomputer control center that monitors its opera-
tion. The control center is programmed by the opera-
tor to suit job specifications. Automatic timed start-ups
and shutdowns are also programmable to suit night-
time, weekends, and holidays. The operating status,
temperatures, pressures, and other information perti-
nent to operation of the chiller are automatically dis-
played and read on a graphic display. Other displays
can be observed by pressing the keys as labeled on the
control center. The chiller with the OptiView control
center is applied with a Variable Speed Drive.
In operation, a liquid (water or brine to be chilled)
flows through the cooler, where boiling refrigerant ab-
sorbs heat from the liquid. 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 chiller to complete the chilled liquid circuit. (See
Figure 2 on Page 10 )
SECTION 1 - DESCRIPTION OF SYSTEM AND
FUNDAMENTALS OF OPERATION
SYSTEM OPERATION DESCRIPTION
This manual covers the operation of the YMC
2
Chiller
with M1B motor, but having two separate means of
capacity control and motor cooling based on the com-
pressor gas path revision level A or B as identified in
the compressor model number. See the compressor
nomenclature description at the front of this manual.
Items in this manual will be specified pertinent to only
one specific compressor gas path revision level where
applicable and defined separately for either style in
other cases. Watch for notes regarding the separate va-
rieties when reviewing the information.
The YORK Model YMC
2
Chiller is commonly applied
to large air conditioning systems, but may be used on
other applications. The chiller consists of hermetic
motor mounted to a compressor, condenser, evaporator
and variable flow control.
LD14000
CONDENSER
CONTROL
CENTER
COMPRESSOR
FIGURE 1 - MODEL YMC
2
CHILLER
VARIABLE
SPEED
DRIVE