Guide Specifications; Reciprocating Air-Cooled Liquid Chiller; Hvac Guide Specifications - Carrier 30GTN Product Data

Guide specifications

Reciprocating Air-Cooled Liquid Chiller

HVAC Guide Specifications

Size Range: 50 to 400 Tons (176 to 1408 kW) Nominal
Carrier Model Number: 30GTN,GTR,GBN,GBR
Part 1 — General
1.01 SYSTEM DESCRIPTION
Easy-to-use, microprocessor-controlled air-cooled
liquid chiller utilizing reciprocating compressors and
long-stroke electronic expansion valves.
1.02 QUALITY ASSURANCE
A. Unit shall be manufactured in a facility
registered to ISO 9001 (International Standards
Organization) manufacturing quality standard.
E. Unit operation shall be fully tested at the factory.
1.03 DELIVERY, STORAGE, AND HANDLING
A. Unit shall be stored and handled per unit
manufacturer's recommendations.
B. Unit controls shall be capable of withstanding
150 F (66 C) storage temperature in the control
compartment for an indefinite period of time.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory-assembled, single piece, 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
members.
2. Cabinet shall be galvanized steel casing with a
pre-painted finish.
3. Cabinet shall be capable of withstanding
500-hour salt spray test in accordance with the
ASTM B-117 standard.
C. Fans:
Condenser fans shall be direct-driven propeller
type discharging air vertically upward and shall be
equipped with the following features:
1. Permanently lubricated bearings.
2. Steel wire safety guards.
3. Statically and dynamically balanced fan blades.
D. Compressors:
1. Reciprocating semi-hermetic type only.
2. Each equipped with an automatically-reversible
oil pump, operating oil charge, suction and
discharge shutoff valves, and an insert-type
factory-sized crankcase heater to control oil
dilution.
3. Each mounted on spring vibration isolators
with an isolation efficiency of no less than
95%.
4. Speed shall not exceed 1750 rpm (29.2 r/s).
5. Cycles per hour per compressor shall not
exceed 6.
E. Cooler:
1. Shell-and-tube type with removable heads.
2. Tubes shall be internally enhanced seamless-copper
type rolled into tube sheets.
3. Equipped with flange type fluid connections.
4. Shell shall be insulated with
foam (closed-cell) with a maximum K factor of
0.28.
5. Design shall incorporate 2 independent direct-
expansion refrigerant circuits.
6. Cooler shall be tested and stamped in accordance
with ASME Code for a refrigerant working side
pressure of 278 psig (1916 kPa).
Cooler shall have a maximum fluid-side pressure
of 300 psig (2068 kPa).
F. Condenser:
1. Coil shall be air-cooled with integral subcooler,
constructed of aluminum fins mechanically bonded
to seamless copper tubes which are then cleaned,
dehydrated, and sealed.
2. Air-cooled condenser coils shall be leak tested at
150 psig (1034 kPa) and pressure tested at 450 psig
(3103 kPa).
G. Refrigeration Components:
Refrigerant circuit components shall include hot gas
muffler, high side pressure switch, liquid line shutoff
valves, suction and discharge shutoff valves, filter
drier, moisture-indicating sight glass, stepper motor
actuated electronic expansion valve (EXV) or
thermostatic expansion valve (TXV), and complete
operating charge of refrigerant R-22 and compressor
oil.
H. Controls, Safeties, and Diagnostics:
1. Controls:
a. Unit controls shall include the following
minimum components:
1) Microprocessor.
2) Power and control circuit terminal blocks.
3) ON/OFF control switch.
4) Replaceable solid-state relay panel.
5) Clear language, expandable, alpha numeric
diagnostic display/set point panel.
6) Thermistor installed to measure saturated
condensing temperature, cooler saturation
temperature, compressor return gas
temperature, and cooler entering and
leaving fluid temperatures.
b. Unit controls shall be capable of performing
the following functions:
1) Automatic circuit lead/lag (accessory
required for 040-070 sizes).
2) Pumpout at beginning and end of every
circuit cycle.
3) Capacity control based on leaving chilled fluid
temperature and compensated by rate of
change of return-fluid temperature.
4) Limiting of the chilled fluid temperature
pulldown rate at start-up to 1° F (.56° C) per
minute to prevent excessive demand spikes
(charges) at start-up.
5) Seven-day time schedule.
6) Leaving chilled fluid temperature reset from
return fluid, outdoor-air temperature, space
temperature, or 4 to 20 mA input.
7) Demand limit control with 2-stage control (0
to 100% each) or through 4 to 20 mA input (0
to 100%).
36
/ -in. (19-mm) PVC
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