Quantech QCC2015CEE, Installation, Operation And Maintenance Manual, Page: 13 / 172

QUANTECH
13
Form QCC2-NM1
Issue Date: 5/20/2021
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Section 2 – Product description
Introduction
Quantech Series 40 Air-Cooled Scroll Condensing
Units provide chilled water for all air conditioning ap-
plications using central station air handling or terminal
units. They are completely self-contained and are de-
signed for outdoor (roof or ground level) installation.
Each unit includes hermetic scroll compressors, a liq-
uid cooler, air cooled condenser, and a weather resis-
tant microprocessor control center, all mounted on a
pressed steel base.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready
for field installation.
The unit is pressure-tested, evacuated and given a ni-
trogen holding charge and includes an initial oil charge
(R-410A refrigerant supplied by others). After assem-
bly, a operational test is performed to ensure that each
control device operates correctly.
The unit structure is heavy-gauge, galvanized steel.
This galvanized steel is coated with baked-on pow-
der paint which, when subjected to ASTM B117 1000
hour, salt spray testing, 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 refrigeration, and are cETL
listed. All units are produced at an ISO 9000-registered
facility.
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.
General system description
Compressors
The condensing unit has suction-gas cooled, hermetic,
scroll compressors. The QCC2 compressors incorpo-
rate a compliant scroll design in both the axial and
radial direction. All rotating parts are statically and
dynamically balanced. A large internal volume and oil
reservoir provides greater liquid tolerance. Compres-
sor crankcase heaters are also included for extra pro-
tection against liquid migration.
An annular discharge check valve and reverse vent as-
sembly provides low pressure drop, silent shutdown,
and reverse rotation protection.
Condenser
Coils – Fin and tube condenser coils of seamless, in-
ternally-enhanced, high-condensing-coefficient, corro-
sion resistant copper tubes are arranged in staggered
rows, mechanically expanded into aluminum fins. Inte-
gral subcooling is included. The design working pres-
sure of the coil is 650 psig (45 bar).
Figure 1 - Quantech Air-Cooled Scroll Compressor Condensing Unit