There are no check valves or extra metering devices on most water-source packaged units because:

A) Most water-source packaged units use suction line accumulators and charge compensators.
B) The heat exchangers are most often made of copper, cupronickel, or stainless steel.
C) Water-source packaged units have a much lower operating temperature range than air-source units.
D) Most water-source packaged units use a single bi-flow thermostatic expansion valve.


D

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