17EX
Centrifugal Liquid Chiller
50/60 Hz
600 to 2300 Nominal Tons
(2110 to 8090 kW)
Carrier's 17EX Hermetic and Open Drive Centrifugal Liquid Chillers operate with environmentally safe HFC-134a. These chillers combine industrial quality with superior efficiency in a packaged design to minimize system costs. The Carrier 17EX chiller features:
FEATURES/BENEFITS
The 17EX open drive centrifugal
liquid chiller features:
Single-piece factory package
- The 17EX chiller is completely assembled in the factory and
shipped in one piece to the jobsite. This allows each unit to
be tested before delivery to the customer. It also ensures that
every aspect of the unit meets stringent quality standards specified
by Carrier. One piece shipment eliminates costly and time consuming
field assembly.
Modular construction
- The cooler, compressor, condenser, and economizer/storage vessel
assemblies are completely bolted together, making the 17EX chiller
ideally suited for replacement projects where ease of disassembly
and re-assembly at the jobsite are essential.
Application flexibility
- By providing a wide assortment of compressor and gear arrangements,
the 17EX chiller is an efficient, quality package ideally suited
for domestic chilled water, export chilled water, brine chilling,
and ice making applications.
Open motor design
- An open motor design which provides electric motor flexibility.
Lubrication system
- This forced lubrication system consists of an electrically-driven
oil pump, filter, heater, and refrigerant-cooled or water-cooled
oil cooler. It provides an ad-equate supply of oil to the transmission
gears and all bearing surfaces during start-up, operation, and
coastdown. The electrically driven oil pump is supplied by a
separate power line ensuring an adequate oil supply in the event
of compressor power interruptions. A microprocessor-controlled
oil heater prevents excessive absorption of refrigerant into the
oil during compressor shutdown.
Variable inlet guide vanes
- These vanes are connected with aircraft-quality cable and controlled
by a precise electronic actuator. Chilled water temperature is
maintained within ± .5 F (.3 C) of desired set point with-out
surge, cavitation, or undue vibration. The vanes regulate inlet
flow to provide high efficiency through a wide, stable operating
range with-out hot gas bypass.
Double helical industrial
type gears - Unlike
single helical gears, double helical gears have a greater tooth-contact
area which can transmit higher horsepower loads more smoothly.
In addition, this design absorbs axial thrust loads that are
generated in the transmission of power to ensure a long, dependable
life for all components in the system.
Split-sleeve, steel back,
babbitt-lined journal bearing
- The 17EX chiller uses 2 steel back, babbit-lined bearings on
both sides of the thrust bearing to form a ''fully supported''
internal shaft. The steel backing provides structural strength
for the bearing, while the babbitt material provides a superior
bearing surface. The split-sleeve design facilitates bearing inspection
without shaft removal. This makes for a very solid rotating assembly
which reduces heat, wear, vibration, and the possibility of shaft
failure.
Tilting pad, self-leveling,
babbitt-lined, Kingsbury-type thrust bearing
- The Kingsbury-type thrust bearing employs an expanded equalized
surface that faces a rotating disc on the shaft. This surface
is comprised of 8 pads made from babbitt. Each pad is supported
by plates which give the pads a self-aligning nature, allowing
for field adjustments. During operation, the pads take on a wedge-shape
formation. This formation ensures that the load-carrying surfaces
of the bearing are separated by a relatively thick film of lubricant,
pre-venting metal-to-metal contact. In case of accidental reverse
shaft rotation, the pads on the thrust bearing can realign themselves
and form a wedge-shape in the opposite direction, consequently
reducing wear and increasing bearing life.
Large inspection opening
- Each compressor is equipped with an access cover to facilitate
bearing and gear inspection without compressor disassembly. This
makes the 17EX chiller ideal for yearly inspections and preventive
maintenance programs.
Compressor run tested
- Every compressor assembly is run-tested in accordance with stringent
Carrier engineering requirements. These tests, performed prior
to final machine assembly, ensure proper and reliable operation.
The heat exchangers feature:
Pressure-tested vessels
- Each heat exchanger (water-side) is hydrostatically tested at
150% of design pressure. The entire machine assembly is pneumatically
burst-tested at 125% of design pressure and then subjected to
a standing vacuum test. This increases unit reliability and ensures
safe machine operation.
ASME certified construction
- ASME ''U'' stamp and nameplate on both the refrigerant and water-sides
of the chiller for safety, reliability, and long life.
Marine waterboxes
- The marine waterboxes, optional on both cooler and condenser,
facilitate tube cleaning and eliminate the need to disassemble
piping.
High-performance heat exchanger
tubing - Heat exchanger
tubes can be internally and externally enhanced for high efficiency.
A wide range of alternate tube types and materials is available.
Double-grooved tube sheet
holes - Tubing
is rolled and expanded into double grooved tube sheets to eliminate
the possibility of leaks between the water and refrigerant system.
Closely-spaced intermediate
support sheets
- Tubes in the cooler and condenser are supported by closely-spaced
intermediate support sheets which prevent tubes from sagging and
vibrating.
Tube expansion at intermediate
support sheets
- Because of the volatile environment in the cooler heat exchanger,
tubes are expanded into each intermediate support sheet, pre-venting
unwanted tube movement and vibration.
Condenser impingement baffle
- This feature prevents direct impingement of high velocity compressor
discharge gas onto the condenser tubes. The baffle eliminates
the related vibration and wear of the tubes and distributes the
refrigerant flow evenly over the length of the vessel for im-proved
efficiency.
Flash subcooler
- The flash sub-cooler, located in the bottom of the condenser,
brings warm condensed refrigerant into contact with the inlet
(coldest) water tubes. This subcools the liquid to a temperature
less than its condensing temperature. Therefore, the overall
refrigeration cycle efficiency is increased, resulting in lower
power consumption.
The flash economizer/storage vessel
features:
Integrated economizer/storage
vessel with pumpout unit
- This system is self-contained, easy to operate, and more cost
effective than remote storage options. As a self-contained unit,
the 17EX chiller can be applied to applications that incorporate
more than one type of refrigerant, without the cost penalty of
requiring additional remote storage systems. Additionally, the
optional pumpout compressor meets EPA's vacuum level requirements
that man-date minimizing refrigerant emissions during service.
Interstage flash economizer
- The liquid refrigerant leaving the con-denser passes through
2 pressure reducing devices in the economizer/ storage vessel
before reaching the cooler. After going through the first device,
some of the liquid flashes because of the sudden drop in pressure.
It is drawn off to the inlet of the compressor second stage,
reducing the first stage weight flow and horse-power. As a result,
the economizer increases refrigeration effect and cycle efficiency.
Ball-type float valves
- These valves provide precise refrigerant metering at any load.
As a result, optimal refrigerant levels can be maintained in the
condenser and cooler to achieve the greatest efficiency with-out
gas bypass or flooding.
Bolt-on covers
- These covers allow access to the float valves to facilitate
inspection.
Storage tank
- This tank is sized so that the entire refrigerant charge occupies
no more than 90% of the tank volume at 90 F (32 C). This feature
reduces service worktime, minimizes downtime, eliminates the additional
space required for a separate tank, and eliminates the need for
costly field-erected transfer piping.
Isolating valves
- These valves isolate the integrated economizer/storage vessel
from the condenser, cooler, and compressor during pumpout and
servicing.
Microprocessor controls feature:
Direct digital Product
Integrated Control (PIC)
- The PIC provides unmatched flexibility and functionality. Each
unit integrates directly with the Carrier Comfort Network (CCN)
providing a system solution to controls applications.
Local Interface Device
(LID) - This device,
configured to display in either English or metric units, provides
unparalleled ease of human inter-face. A 16-line by 40-character
LCD (liquid crystal display) features 4, menu-specific, softkeys.
The default display offers ''all in one glance'' access to key
chiller operating data, simplifying machine-user interface.
Optional modules
- These modules offer control expandability by allowing chilled
water reset and de-mand limit set points to be controlled from
remote sources. Optional temperature sensors can also be connected
and monitored by these modules.
Modular pull-out/plug-in
design - Plug design
reduces wiring requirements for easy installation.
Low-voltage design
- The Class 2 control center design provides the ultimate assurance
of personal safety and control integrity.
Over 100 PIC monitoring
functions and conditions
- PIC displays over 125 operating, state, and diagnostic messages
for improved user interface.
Battery backup
- Battery backup provides protection during power failures and
eliminates time consuming control reconfiguration.
Extensive service menu
- The service menu can be password-protected to prevent unauthorized
access. Built-in diagnostic capabilities aid troubleshooting and
recommend proper corrective action for pre-set alarms resulting
in greater uptime. The control test allows the user to confirm
operation of inputs and out-puts for increased confidence.
Automatic capacity override
- This function unloads the compressor whenever key safety limits
are approached, increasing unit life.
Encapsulated circuit board - Designed and built in-house, each board must meet Carrier's stringent quality standards resulting in superior reliability compared to open board designs.