Schreiber Chillers System OVerview - Manual

SCHREIBER ENGINEERING
ISO 9001:2000 Certified 12111 E. Park Street, Cerritos, California 90703
A DOVER COMPANY MAIN: 562-926-3855 FAX: 562-926-0969
MYDOC/MISCELLANOUS/manuals/Modular/SystemOverview Overview
System Overview
This system is designed as a modular system where dual circuit chiller module can be
utilized as a part of a larger chilled water system, or on it’s own as standalone cooling
solution. In addition, the system is designed such that additional chiller or pump modules
can be added directly. Small extra foot print beyond the size of the module is required.
The system is a combination of chillers and pumping station to provide chilled water to the
process and chiller modules. The thermal mass of the reservoir helps to maintain stable
water temperatures and to prevent short cycling of the system. It provides a convenient
place to fill the system with water and other water treatment chemicals. It is designed
with the same shape of the chiller modules to provide and integrated chiller system. When
a pump module is used, it serves as the master controller for all of the modules.
The integral pump draws water from the reservoir and pumps it through the chiller
modules. Depending on flow requirements, this pump can also be used to pump the
chilled water through the whole system.
CONTROL SYSTEM OVERVIEW
The control enclosure contains a fused disconnect, controller, and all of the pump starters.
The controller is a microprocessor based controller with a 4 x 20 built in LCD display. It
communicates with other chiller modules to control the entire system.
The Schreiber modular chillers use a control system that allows the individual controllers
for each module to be linked into one system. A single module is designated as the
MASTER controller. In a system with a pump/reservoir module, this module is usually the
master.
The master module reads the supply temperature of the chilled water to the process. The
desired chilled water is also set at the master module. The master module then turns on
the individual compressors of each chiller module to match the load. The master also
handles the rotation of each module so that the same module does not always cycle first.
Each individual chiller module handles alarms, time delays, compressor rotation within the
module, and head pressure control for only that module.
A pump module acts as the master temperature control for all of the modules and handles
the on/off control of the pumps and the entire system.
Each module contains a display so that each module can be programmed. A remote
terminal connected to the master terminal can be scrolled through each module as well.
An upgraded graphic display (optional) has the ability to monitor all of the controllers
simultaneously.