Quantech QTC40160, Installation Operation & Maintenance

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Quantech
15
Form QTC4-NM2
Issue date: 05/12/2023
2
Section 2 - Product description
Quantech QTC4 chillers are designed for water or gly-
col cooling. All units are designed to be located outside
on the roof of a building or at ground level.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready
for field installation.
Before delivery, the unit is pressure tested, evacuated,
and fully charged with refrigerant and oil in each of the
two independent refrigerant circuits. After assembly,
an operational test is performed with water flowing
through the evaporator to ensure that each refrigerant
circuit operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. Many external structural parts are
coated with baked-on enamel powder Champagne
paint color (RAL 7006, Munsel No. 9.8YR4.36/1.2).
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.
General system description
The QTC4 Chiller combines the best of modern screw
compressor design with the latest technology in vari-
able speed drives (VSD). The result is superior control
and efficiency in real world conditions. The VSD can
slow the speed of the compressor to match the load on
the system resulting in precise chilled liquid control,
minimized sound, maximum energy efficiency, and re-
duced cost of ownership. The VSD also provides soft
starts with no electrical inrush. The lack of heat build-
up on start also enables required off time between starts
to be reduced to a period of 2 min.
The QTC4 Air-Cooled Screw Chiller uses many com-
ponents, which are the same or nearly the same as a
standard screw chiller of a similar size. This includes
modular frame rails, condenser, fans, compressors, and
evaporator.
The chiller consists of two screw compressors in a
corresponding number of separate refrigerant circuits,
a series counter flow type hybrid falling film evapo-
rator, an air-cooled condenser, brazed plate heat ex-
changer economizer, feed valves, oil separators, and
compressor mufflers.
Figure 1 -
QTC4 air-cooled screw liquid chiller with variable speed drive
LD15045