Section 1 - Description Of System And Fundamentals Of Operation; System Operation Description; Figure 1 - Model Yk-Ep Chiller - York YK-EP B Operation & Maintenance Manual

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS

SYSTEM OPERATION DESCRIPTION

The YORK Model YK-EP Chiller is commonly applied
to large air conditioning systems, but may be used on oth-
er applications. The chiller consists of an two open mo-
tors, each mounted to a compressor (with integral speed
increasing gears), condenser, evaporator and variable
flow control.
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 nighttime,
weekends, and holidays. The operating status, tempera-
tures, pressures, and other information pertinent to oper-
ation of the chiller are automatically displayed and read
on a graphic display. Other displays can be observed
CONDENSER

FIGURE 1 - MODEL YK-EP CHILLER

JOHNSON CONTROLS
OF OPERATION
by pressing the keys as labeled on the Control Center.
The chiller with the OptiView Control Center is applied
with an Electro-Mechanical Starter, YORK Solid State
Starter (optional), or Variable Speed Drive (optional).
The economizer compressor motor is controlled by a
solid-state starter exclusively.
When the compressor motor is driven by a YORK Sol-
id State Starter, one of three different starters could be
applied. Chillers are equipped with either the Style B
Liquid Cooled Solid State Starter (LCSSS), the Medium
Voltage Solid State Starter (MVSSS) or Remote Mount-
ed Medium Voltage Solid State Starter (MVSSS).
COMPRESSORS
MOTOR
EVAPORATOR
CONTROL
CENTER
1
11