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44
Air-Cooled Liquid Chiller
HVAC Guide Specifications
Size Range:
10 to 55 Nominal Tons
(25 to 200 Nominal kW)
Carrier Model Number:
30RA
Part 1 — General
1.01 SYSTEM DESCRIPTION
Microprocessor controlled, air-cooled liquid chiller
utilizing scroll compressors, low sound fans, optional
hydronic pump system and fluid storage tank.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standard
550/590, latest edition (U.S.A.).
B. All units shall be ASHRAE 90.1 compliant.
C. Unit construction shall comply with ASHRAE 15
Safety Code, UL 1995, and ASME applicable codes
(U.S.A. codes).
D. Unit shall be manufactured in a facility registered to
ISO 9001:2000 Manufacturing Quality Standard.
E. Unit shall be full load run tested at the factory.
1.03 DELIVERY, STORAGE AND HANDLING
A. Unit controls shall be capable of withstanding
150 F (66 C) storage temperatures in the control
compartment.
B. Unit shall be stored and handled per unit manufac-
turer's recommendations.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory assembled, single-piece chassis, air-cooled
liquid chiller. Contained within the unit cabinet shall
be all factory wiring, piping, controls, refrigerant
charge (R-22), and special features required prior to
field start-up.
B. Unit Cabinet:
1. Frame shall be of heavy-gage galvanized steel.
2. Cabinet shall be galvanized steel casing with a
baked enamel powder or pre-painted finish.
3. Cabinet shall be capable of withstanding
500-hour salt spray test in accordance with the
ASTM (U.S.A.) B-117 standard.
C. Fans:
1. Condenser fans shall be direct-driven, 11-blade
airfoil cross-section, reinforced polymer con-
struction, shrouded-axial type, and shall be stat-
ically and dynamically balanced with inherent
corrosion resistance.
2. Two-speed or single fan operation shall allow
reduced sound levels during scheduled unoccu-
pied operating periods. Manufacturers without
unoccupied reduced sound capability shall sub-
mit
1
/
3
octave band data and sound power data
as measured according to ARI 370 as confirma-
tion of unit sound characteristics.
3. Air shall be discharged vertically upward.
4. Fans shall be protected by coated steel wire
safety guards.
D. Compressors:
1. Fully hermetic scroll type compressors.
2. Direct drive, 3500 rpm, protected by line break
device, suction gas cooled motor.
3. External vibration isolation - rubber in shear.
E. Cooler:
1. Cooler shall be rated for a refrigerant working-
side pressure of 450 psig (3103 kPa) and shall
be tested for a maximum water-side pressure of
150 psig (1034 kPa).
2. Shall be single-pass, ANSI type 316 stainless
steel, brazed plate construction.
3. Shell shall be insulated with
3
/
4
-in. (19 mm)
closed-cell, polyvinyl-chloride foam with a maxi-
mum K factor of 0.28.
4. Shall incorporate 2 independent refrigerant cir-
cuits on sizes 035 to 055; sizes 010 to 030
shall have one independent refrigerant circuit.
5. Cooler shall have an optional factory-installed
heater, to protect cooler from ambient tempera-
ture freeze down to –20 F (–29 C).
6. Unit shall be provided with a factory-installed
flow switch.
F. Condenser:
1. Coil shall be air-cooled with integral subcooler,
and shall be constructed of aluminum fins
mechanically bonded to seamless copper tubes.
2. Tubes shall be cleaned, dehydrated, and sealed.
3. Assembled condenser coils shall be leak tested
and pressure tested at 450 psig (3103 kPa).
G. Refrigeration Components:
Refrigerant circuit components shall include filter
drier, moisture indicating sight glass, thermal expan-
sion device, and complete operating charge of both
refrigerant R-22 and compressor oil.
H. Controls, Safeties, and Diagnostics:
1. Controls:
a. Unit controls shall include the following min-
imum components:
b. Microprocessor with non-volatile memory.
Battery backup system shall not be accepted.
c. Single terminal block for power and
controls.
d. Control transformer to serve all controllers,
relays, and control components.
e. ON/OFF control switch.
f. Replaceable solid-state relay panels and
controllers.
g. Pressure sensors installed to measure cooler
entering and leaving saturated temperatures
and outside air temperature. Thermistors
Guide specifications