Introduction - Quantech QCC3 Manual

Introduction

QUANTECH
GENERAL
The 80-160 Ton (273 - 560 kW) QCC3 Condensing Unit Models are shipped complete
from the factory ready for field installation.
The unit is pressure-tested, evacuated and given a nitrogen holding charge and includes
an initial oil charge (R-410A refrigerant supplied by others). After assembly, a operational
test is performed to assure that each control device operates correctly.
The unit structure is heavy-gauge, galvanized steel. This galvanized steel is coated with
baked-on powder paint, which, when subjected to ASTM B117 1000 hour, salt spray test-
ing, yields a minimum ASTM 1654 rating of "6". Units are designed in accordance with
NFPA 70 (National Elec tric Code), ASHRAE/ANSI 15 Safety code for mechanical refrig-
eration, and are cETL listed. All units are produced at an ISO 9000-registered facility.
COMPRESSORS
The chiller has suction-gas cooled, hermetic, scroll com pressors. The compressors in-
corporate a compliant scroll design in both the axial and radial direction. All rotating parts
of the compressors are statically and dynamically balanced. A large internal volume and
oil reservoir pro vides greater liquid tolerance. Compressor crankcase heaters are also
included for extra protection against liquid migration.
CONDENSER
Coils – Fin and tube condenser coils of seamless, inter nally-enhanced, corrosion resis-
tant copper tubes are arranged in staggered rows, mechanically expanded into aluminum
fins. Integral subcooling is included. The design working pressure of the coil is 650 psig
(45 barg).
Fans – The condenser fans are composed of corro sion-resistant aluminum hub and glass-
fiber-reinforced polypropylene composite blades molded into a low noise airfoil section.
The are designed for maximum efficiency and are statically and dynamically balanced for
vibration free operation. They are directly driven by independent motors, and positioned
for vertical air discharge. The fan guards are constructed of heavy-gauge, rust-resistant,
coated steel. All blades are statically and dynamically balanced for vibration-free opera-
tion.
Motors – The fan motors are Totally Enclosed Air-Over, squirrel-cage type, current pro-
tected. They feature ball bearings that are double-sealed and permanently lubri cated.
REFRIGERANT CIRCUIT
Two inde pendent refrigerant circuits will be furnished on each unit. All unit piping will be
copper, with brazed joints. The liquid line will include a field connection shutoff valve with
charg ing port located on each condenser circuit. Suction line connections are provided on
each refrigeration circuit. A filter drier and sight glass are shipped loose for field installation
on each refrigerant circuit.
All expansion valves, liquid line solenoid valves, refriger ant, and refrigerant field piping
are supplied by others.
FORM QCC3-EG1 (517)
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