Operating Principles - Trane Manhattan Gen II Installation, Operation And Maintenance Manual

Operating Principles

The Manhattan™ Gen II Water-Cooled Modular Chiller is
designed to operate with a water/glycol mixture to prevent
rust, scaling, and organic growth.
The Manhattan™ Gen II Chiller provides 44 °F (7 °C) water/
glycol under a heat load with a return temperature of 54 °F
(12 °C). The Manhattan™ Gen II Chiller typically uses an
R410A, water-cooled mechanical refrigeration system.
The water/glycol mixture is cooled via a compact, brazed
plate evaporator. An externally adjustable thermal
expansion valve meters the proper flow of refrigerant to
the evaporator where it evaporates and the heat in the
system water/glycol mixture transfers to the refrigerant.
The compressor then compresses the vapor to a higher
pressure so that the condensing pressure of the
refrigerant is at a higher temperature than the ambient air
that is used to condense it. The condenser then condenses
the vapor to a saturated liquid, and further cools it so that
it reaches the expansion valve as a saturated liquid, to
complete the basic cycle.
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