Product data

31
Open Drive Centrifugal Chiller
Size Range:
1500 to 2250 Tons
(5820 to 7910 kW) Nominal
Carrier Model Number:
17EX (with External Gear)
Part 1 — General
1.01 SYSTEM DESCRIPTION
A. Microprocessor controlled liquid chiller using two-
stage hermetic or open centrifugal compressor with
HFC-134a refrigerant. Chillers using CFC refriger-
ants such as CFC-11, CFC-12, or CFC-500 shall
not be acceptable. Refrigerants such as HCFC-123
or HCFC-22 are not recommended.
B. If a manufacturer proposes a liquid chiller using
HCFC-123 refrigerant, then the manufacturer shall
include in the chiller price:
1. A vapor activated alarm system consisting of all
alarms, sensors, safeties, and ventilation equip-
ment as required by ANSI/ASHRAE Stand-
ard 15 (latest edition) with the quotation. System
shall be capable of responding to HCFC-123
levels of 30 ppm Allowable Exposure Limit
(AEL).
2. External refrigerant storage tank, pumpout unit,
and interconnecting piping.
3. High efficiency purge unit.
4. Relief valve installed in series with rupture disk.
5. A device to prevent an off-line chiller from stay-
ing in vacuum at idle and also to act as a manual
leak pressurization/detection device during ser-
vice, equal to PREVAC® as manufactured by
Mechanical Ingenuity, Inc. The device shall be
factory installed.
6. Labor and materials, including refrigerant,
required to convert to HFC refrigerant while
guaranteeing design tons and power consump-
tion after conversion. Conversion will be per-
formed any time within 20 years of start-up and
after the new HFC refrigerant has been
approved by NIOSH or similar authorities.
1.02 QUALITY ASSURANCE
A. Chiller performance shall be rated in accordance
with ARI Standard 550 (latest edition), 60 Hz only.
B. Equipment and installation shall be in compliance
with Safety Code for Mechanical Refrigeration,
ANSI/ASHRAE 15 (latest edition).
C. Cooler and condenser, refrigerant and water side,
shall include ASME “U” stamp and nameplate certi-
fying compliance with ASME Section VIII, Division 1
code for unfired pressure vessels.
D. Starter enclosure shall conform to NEMA 1.
E. Compressor impellers shall be over-speed tested by
manufacturer to a minimum of 10% above continu-
ous operating speed.
F. Motor construction and testing shall comply with
NEMA MG1, NEC, and IEEE 112 latest edition
standards.
G. Controls shall meet all limitations on radiated and
conducted radio-frequency emissions for Class A
devices, defined in FCC Rules and Regulations,
Part 15, Sub-part J.
H. Chiller, controls, and all available options shall meet
ISO 9001 requirements.
1.03 DELIVERY, STORAGE, AND HANDLING
A. Unit shall be stored and handled in accordance with
manufacturer’s instructions.
B. Unit shall be shipped with all refrigerant piping and
control wiring factory-installed.
C. Unit shall be shipped with firmly attached nameplate
that indicates name of manufacturer, chiller model
number, compressor type, and refrigerant used.
1.04 WARRANTY
Warranty shall include parts and labor for one year
after start-up or 18 months after shipment, which-
ever occurs first.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory assembled, single-piece, liquid chillers shall
consist of an open drive externally geared compres-
sor, motor, lubrication system, cooler, condenser,
interstage flash economizer/refrigerant storage ves-
sel, vibration isolation assembly, electrical micropro-
cessor control system, and documentation required
prior to start-up. The initial compressor oil charge
shall be factory-installed in the chiller. The initial
refrigerant charge shall be supplied by the chiller
manufacturer for field installation. Motor starter shall
be supplied by the chiller manufacturer for field
installation.
If heat exchangers and compressor-drive are not
supplied as a single piece from the factory, the unit
shall include:
1. Rigid, drive line, steel base with compressor and
drive factory-mounted and cold-aligned. Drive
line water piping shall be terminated at a mani-
fold at the edge of the base. All drive line wiring
shall be terminated at a single terminal strip
which is clearly labeled.
2. All refrigerant piping shall be cleaned, pickled,
sealed, and nitrogen charged to prevent rust and
scale build-up during storage. Installation of all
refrigerant piping (including interconnecting
pump-out piping) shall be the mechanical con-
tractor’s responsibility.
3. Hydrostatic testing of the complete unit, includ-
ing piping, at 1.5 times design pressure. Evacu-
ation, drying, and charging of system after
testing shall be provided by manufacturer’s start-
up personnel.
4. In addition to water, vent, and utilities con-
nections, all interconnnecting tubing, wiring,
and piping required to provide a complete
Guide specifications