Trane Modu manual General, Installation Information

General

Installation Information

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-

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

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.

Figure I-GI-1. IntelliPak® commercial self-contained Modular Series unit.

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