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Modular Series Self-Contained
Unit Components
Commercial self contained units are
complete HVAC systems used in floor-by-
floor applications. Units are easy to install
because they feature a single point
power connection, factory installed and
tested controls, single water point
connection, factory installed options, and
an internally trapped drain connection.
Modular self-contained units can ship as
split-apart units for installation ease. Split-
apart units ship with a dry nitrogen
charge and require field refrigerant
charging.
Units consist of multiple compressors,
water-cooled condensers (water-cooled
units only), an evaporator coil, dual
forward curved fans, and control panel.
Air-cooled units require a remote air-
cooled condenser, model CXRC. The
hermetically sealed 3-D scroll
compressor motors utilize internal motor
protection and time delays to prevent
excessive cycling. Unit controls are either
an electromechanical thermostat or
microprocessor controls on the IntelliPak
unit. See Figure I-GI-1 for a typical unit.
The hermetically sealed 3-D scroll
compressor motors utilize internal motor
protection and time delays to prevent
excessive cycling.
The water-cooled condensers are shell
and tube type with an internal subcooler.
Condensers are available as mechani-
4
Installation
cally or chemically cleanable. The
evaporator fan is double width, double
inlet and forward curved with a fixed
pitch belt drive assembly. Frequency
drives or inlet guide vanes are optional.
Motor options are standard efficiency
open drip proof (ODP) or totally enclosed
fan cooled (TEFC); or premium efficiency
ODP .
All water-cooled units ship with a full
refrigerant and oil charge. Air-cooled
units ship with oil and a dry nitrogen
holding charge and require field-piping
refrigerant connections to the air cooled
Figure I-GI-1. IntelliPak
®
commercial self-contained Modular Series unit.
General
Information
condensing unit. Also, air-cooled units
have two refrigerant circuits. Water-
cooled units have four refrigerant circuits;
which include a filter drier, pressure relief
valve, liquid line service valve, sight glass/
moisture indicator, thermal expansion
valve with a sensing bulb and external
equalizing line, discharge line shrader
valve, a suction line shrader valve, and
high and low pressure cutout switches.
Water-cooled units also include a liquid
line service valve for each circuit.
For more detailed information, see the
Owner's section of this manual.
SCXG-SVX01B-EN
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