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System Flexibility with Unit Options
Along with providing high quality and state-of-the-art
innovation, SWP self-contained systems offer customized
flexibility to satisfy a wide range of diverse applications.
Selection/Application Flexibility
Nominal cooling capacities range from 20 to 125 tons. In
addition, all units offer multiple compressor selections to meet
exacting system requirements. Over 130 different standard
compressor/coil capacity selections are available. The
flexibility to optimize the self-contained system to fit the
application is a McQuay SWP advantage. Available system
applications include the following:
• VAV discharge air temperature control with static pressure
control
• Discharge air temperature control with constant air volume
• Constant volume, zone temperature control
• 100% outside air control
• Dehumidification control, with or without reheat control
In addition to compressor/coil flexibility, SWP systems offer
double width, double inlet, forward curved fans with
factory-mounted variable frequency drives for maximizing
VAV system fan performance. High efficiency fan capability
coupled with extensive compressor flexibility provide the right
system selection for the application.
Arrangement Flexibility
All SWP systems offer the flexibility of right-hand and
left-hand piping arrangements and front and rear fan discharge
orientations. Piping and fan arrangement flexibility can
simplify mechanical equipment room arrangement, improve
installation costs, and improve total system performance.
Optimal Discharge Air Temperature
More and more system engineers are designing optimal
discharge air temperature systems to improve system
performance and system first cost; the McQuay SWP provides
the flexibility to do it successfully. Optimal discharge air
temperature systems are designed to provide unit leaving air
temperature selections of 52°F to 53°F versus more
conventional systems that supply air at temperatures closer to
58°F. This five to six degree reduction in air temperature to the
room diffusers can subsequently reduce the required supply air
volume to the room by 20% to 25%.
The benefits of optimal discharge air temperature systems
become quite apparent with a look at the advantages offered
with reduced supply air cfm airflow:
• Reduced first cost and installation cost by allowing smaller
duct sizes and a smaller air distribution system.
• Reduced bhp requirements. Depending on changes in duct
size and the resulting total static pressure, a 20% reduction in
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supply air cfm can reduce fan bhp requirements by 25% or
more.
• Reduced fan sound power generation and a quieter room
environment.
• Reduced equipment room size may be possible due to using
a physically smaller unit size.
Filtration Flexibility
SWP systems are offered with 4-inch, 30% efficient, pleated
filters as standard. Also available are 4-inch, 65% efficient,
pleated filters and 4-inch, 85% efficient filters with prefilters.
Acoustic Discharge Plenum
While others may provide a simple multidirectional discharge
plenum, SWP systems feature a multidirectional plenum with
true acoustic design qualities.
The following SWT plenum features provide not only
application flexibility but also the acoustic performance not
found in simple, single-wall plenums:
• Heavy-gauge galvanized steel construction
• 3-inch, 3-lb., glass fiber thermal/acoustic insulation
• An inner, perforated galvanized steel acoustic liner
• Internal acoustic baffles
Energy Saving Economizer Flexibility
To improve system operating performance, all SWP systems
offer complete factory-mounted and factory-controlled
waterside economizer capability. Each waterside economizer
system includes a 4-row, mechanically cleanable coil with
dual, 2-way control valves to allow use in either a constant or
variable volume pumping system. In addition, units can be
applied with air economizer cycles with integrated factory
control.
Heating Flexibility
A variety of heating media is offered with each SWP system.
Hot water coils with modulating valve and actuator are
available along with staged electric heat to provide heating
control in a variety of applications.
Controllers
MicroTech II DDC control systems provide constant volume,
variable air volume, 100% outside air, and/or dehumidification
control flexibility. See "Controls" on page 6 for more
information.
McQuay Cat 860-6
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