Patent ID: 8720224

Claim:
An internally gravity flooded evaporator for use with a commercial or industrial heating, ventilation, and air conditioning (“HVAC”) system, the evaporator comprising: a. a first vertical tube disposed adjacent a side of the evaporator; b. a second vertical tube disposed adjacent a side of the evaporator; c. a refrigerant tube disposed within a housing of the evaporator and interconnected with the first vertical tube and with the second vertical tube; d. the second vertical tube interconnected with a tubular expansion joint disposed at an elevation above the refrigerant tube; e. a horizontal tube disposed at an elevation higher than the refrigerant tube; f. the horizontally disposed tube being interconnected with the tubular expansion joint on one end and with the first vertical tube on the other end; g. said first and second vertical tubes, refrigerant tube, tubular expansion joint, and horizontally disposed tube forming, in association with the evaporator, a return loop refrigerant subsystem, the evaporator not requiring use of a separately field-piped surge vessel within the HVAC system to which the evaporator is attached.