3
INTRODUCTION
General
The 19DV unit is factory assembled, wired, and leak tested. Instal-
lation consists primarily of establishing water and electrical ser-
vices to the machine. The rigging, installation, field wiring, field
piping, and insulation of waterbox covers are the responsibility of
the contractor and/or customer. Carrier has no installation respon-
sibilities for the equipment. The refrigerant charge will be installed
by the Carrier Start-up Technician during the start-up process.
Job Data
Necessary information consists of:
• job contract or specifications
• machine location prints
• rigging information
• piping prints and details
• field wiring drawings
• starter manufacturer’s installation details
• Carrier certified print
CHILLER FAMILIARIZATION
Chiller Information Nameplate
The information nameplate is located on the left side of the chiller
control panel. Refer to Fig. 1 for model number identification.
Fig. 1 — 19DV Refrigeration Machine Nameplate
System Components
The main components include the evaporator and condenser heat
exchangers in separate vessels, compressor, refrigerant lubrication
system, control panel, economizer, VFD, and purge system.
Evaporator
This heat exchanger (also known as the evaporator) is located un-
derneath the compressor. The evaporator is maintained at lower
refrigerant temperature/pressure so evaporating refrigerant can re-
move heat from water flowing through its internal tubes.
Condenser
This heat exchanger operates at a higher refrigerant temperature/
pressure than the evaporator and has water flowing through its in-
ternal tubes in order to remove heat from the refrigerant.
Compressor
This component maintains system temperature and pressure dif-
ferences and moves the heat carrying refrigerant from the evapora-
tor to the condenser. The 19DV unit has a back to back two-stage,
direct drive, and economized compressor.
Economizer
This chamber reduces the refrigerant temperature to an intermedi-
ate level between the evaporator and condenser vessels. In the
economizer, vapor is separated from the liquid, the separated va-
por flows to the inlet of the second stage of the compressor, and
the liquid flows into the evaporator. The energy removed from the
vaporized refrigerant in the economizer allows the liquid refriger-
ant in the evaporator to absorb more heat when it evaporates and
benefits the overall cooling efficiency cycle.
VFD
The VFD provides a pulse width modulated signal that results in
variable frequency and voltage to the compressor motor. It is con-
trolled and monitored from the PIC6 control system.
Purge System
The purge system is an independent assembly located under the
condenser. The 19DV chiller system components normally oper-
ate in a vacuum. The purge assembly will automatically remove
air and other non-condensables which may have leaked into the
system to maintain chiller performance. It is controlled through
the PIC6 control system.
PIC6 Touch Screen Panel
This panel is the user interface for controlling the chiller and has
the following functions:
• Chiller operation
• Chiller diagnostic
• Chiller status display
• Chiller parameter configuration
• Open protocol interface to outside building management
system (BMS)
Control Panel
This control panel includes the input and output boards (IOB),
control transformer, relays, contactors, and circuit breakers. It
provides the power distribution and protection to the electrical
component installed on chiller, and has the following functions:
• Communication with PIC6 touch screen
• Communication with purge panel
• Communication with VFD
• Sensor input and outputs
• Actuators control
• Refrigerant pump control
Purge Control Panel
The purge panel includes an input and output boards, control
transformers, relays, and contactors. It provides the power distri-
bution and protection to the electrical components which installed
in the purge system and has the following functions:
• Communication with PIC6 touch screen
• Sensor input and outputs
• Solenoid valve control
• Control of purge compressor, vacuum pump, heater, and
fan control
To Next Page
Loading...
