Water Dispenser User Manual

3
• Machine room cooling requirements
associated with air-cooled motors,
which dissipate heat to the mechan-
ical room.
• High noise levels common with air-
cooled motors, which radiate noise
to the machine room and adjacent
areas.
• Shaft alignment problems that occur
with open-drive designs during start-
up and operation, when equipment
temperature variations cause ther-
mal expansion.
Positive pressure design — Posi-
tive pressure designs eliminate the
need for costly low pressure contain-
ment devices, reducing the initial cost
of the system. The Evergreen
®
23XRV
chiller’s positive pressure design en-
sures that air, moisture and other per-
formance degrading contaminants are
not sucked inside the chiller. Purge
units and their associated mainte-
nance are no longer necessary.
Optional refrigerant isolation
valves — The optional refrigerant
isolation valves allow the refrigerant
to be stored inside the chiller during
shipment from the factory, minimizing
start-up time. During servicing, the
“in-chiller” storage reduces refrigerant
loss and eliminates time-consuming
transfer procedures. As a self-contained
unit, the Evergreen 23XRV chiller does
not require additional remote storage
systems.
Optional pumpdown unit — Com-
bined with the refrigerant isolation
valves listed above, the optional pump-
down unit eliminates complex connec-
tions to portable transfer systems,
thereby reducing service costs. The op-
tional pumpdown compressor meets
Environmental Protection Agency’s
(EPA) vacuum level requirements that
mandate minimizing refrigerant emis-
sions during service.
Modular construction — The cool-
er, condenser, and compressor assem-
blies are bolted together, making Ever-
green 23XRV chillers ideally suited for
replacement jobs where ease of disas-
sembly and reassembly at the jobsite
are essential.
Single point power — The 23XRV
chiller features internal control power
transformers to provide low voltage
power (115 v and 24 vdc) for machine
controls. Simply connecting the three
input power leads to the VFD provides
all unit power.
Marine container shipment — The
compact design allows for open-top
container shipment to export destina-
tions, ensuring quality while reducing
shipping cost.
Heat exchanger combinations —
The Evergreen 23XRV chillers are
available with a complete line of heat
exchangers, ensuring the best combi-
nation of chiller components to meet
project specific tonnage and efficiency
requirements. One, 2 and 3-pass
arrangements are available to meet a
wide variety of flow conditions. Nozzle-
in-head and marine waterboxes are
available to meet 150 psig and
300 psig piping requirements.
Heat exchanger features
ASME certified construction — An
independent agency certifies the
design, manufacture, and testing of
all heat exchangers to American
Society of Mechanical Engineers
(ASME) standards, ensuring heat ex-
changer safety, reliability and long life.
The ASME U-stamp is applied to the
refrigerant side of the evaporator and
condenser and is applied to the water
side of heat exchangers when 300 psig
marine water boxes are provided.
High performance tubing — Carrier’s
Evergreen chillers utilize advances in heat
transfer technology, providing compact,
high-efficiency heat exchangers. Tubing
with advanced internally and externally
enhanced geometry improves chiller per-
formance by reducing overall resistance
to heat transfer while reducing fouling.
Cooler tube expansion — Cooler
tube expansion at center support
sheets prevents unwanted tube move-
ment and vibration, thereby reducing
the possibility of premature tube fail-
ure. Tube wall thickness is greater at
the expansion location, support sheets,
and end tube sheets in order to provide
maximum strength and long tube life.
Double-grooved end tube sheet
holes — This design provides a more
robust seal than single rolled joints, re-
ducing the possibility of leaks between
the water and refrigerant sides of the
chiller.
Condenser baffle — The baffle de-
flects hot discharge gas before it con-
tacts condenser tubes, reducing tube
vibration and wear while distributing
refrigerant more evenly over the
length of the vessel for improved
efficiency.
Closely spaced intermediate sup-
port sheets — Support sheets pre-
vent tube sagging and vibration, there-
by increasing heat exchanger life.
Refrigerant filter isolation valves
— These valves allow filter replace-
ment without pumping down the chill-
er, reducing service time and expense.
FLASC (flash subcooler) — The
subcooler, located in the bottom of the
condenser, increases the refrigeration
effect by cooling the condensed liquid
refrigerant to a lower temperature,
thereby reducing compressor power
consumption.
AccuMeter™ system — The
AccuMeter system regulates refrigerant
flow according to load conditions,
providing a liquid seal at all operating
conditions, eliminating unintentional
hot gas bypass.
Microprocessor controls
features
Direct Digital Product Integrated
control (PIC III) — Carrier’s PIC III
provides unmatched flexibility and
functionality. Each unit integrates
directly with the Carrier Comfort
Network
®
(CCN) system, providing a
solution to controls applications.
International Chiller Visual Con-
troller (ICVC) — The ICVC provides
an unparalleled ease of operation and
can be configured to display English or
metric values.
For convenience, a single display lo-
cated on the chiller VFD panel displays
chiller and VFD data. The VGA 320 x
240 element LCD (liquid crystal dis-
play) features 4 menu specific soft-
keys. The default display offers an
all-in-one glance review of key chiller
operation data, simplifying the interac-
tion between chiller and user.
The display includes 4 standard
languages:
•English
•Chinese
• Japanese
• Korean
Other languages are available.
Automatic capacity override —
This function unloads the compressor
whenever key safety limits are ap-
proached, increasing unit life. This