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OPERATION

The BULLDOG Heat Pump System is a novel combination of two traditional commercial HVAC building technologies.  The system combines conventional water cooled air conditioning and hydronic space heating, all in one package.  A BULLDOG unit operates as a fan coil in heating and a water cooled DX unit in cooling.  The compressors do not operate in the heating mode.  They can cool or heat any space at any time of the year.  Instead of a refrigerant reversing valve for heating, the BULLDOG unit diverts the loop fluid to a hydronic heating coil located inside the unit.  This loop fluid varies in temperature depending on outdoor ambient conditions.  As the ambient temperature gets colder, the fluid temperature is increased.

This loop fluid varies in temperature depending on outdoor ambient conditions. As the ambient temperature gets colder, the fluid temperature is increased.

CGC BULLDOG Loop