An office building has thirty water source heat pumps on a common water loop, and each one left the factory assembled, hermetically sealed and charged with four pounds of R-410A. How is one of those units classified?
Correct Answer
D) As a small appliance, since it is factory sealed and holds under five pounds
The water loop carries water, not refrigerant, so the piping the installer runs is not part of any refrigerant circuit. Each heat pump has its own sealed refrigerant circuit that left the factory assembled, charged and hermetically sealed, holding four pounds. That is the small appliance description in full, so each unit is a small appliance regardless of how many of them share a building or a loop.
Why This Is the Correct Answer
The small appliance definition asks three things: the unit was fully manufactured, charged and hermetically sealed at the factory, and it normally holds five pounds or less. Each of these heat pumps meets all three. The field piping carries loop water and never touches the refrigerant circuit, so it does not make the unit field assembled and does not join the units into one appliance.
Why the Other Options Are Wrong
Option A: As part of a single high-pressure appliance made up of the whole loop
Refrigerant cannot pass from one heat pump to another through the water loop, so the units are not one appliance. Each sealed circuit stands alone.
Option B: As a high-pressure appliance, because the water loop is field piped
The field piping on this system carries water. Piping that never contains refrigerant has no effect on how the refrigerant circuit is classified.
Option C: As a very high-pressure appliance, because of its operating pressures
Very high-pressure describes refrigerants that boil far below the ordinary range. It is not a label for equipment that runs at elevated operating pressures.
Memory Technique
Follow the refrigerant, not the pipefitter. If the installer's pipe holds water, the unit is still factory sealed.
Reference Hint
Small appliance: factory manufactured, charged and hermetically sealed, normally holding five pounds or less of refrigerant.
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