Ventilation air tempering device

In a heating and cooling system of the type comprising at least one reversible cycle air cooling and heating unit of the type comprising at least one refrigerant-water contacted coil;

• and,
• refrigerant control means operable to selectively cause the refrigerant-water contacted coil to operate as a refrigerant condensor or to act as a refrigerant evaporator;
• a closed loop water circulation circuit connected with the refrigerant-water contacted coil to achieve heat with the refrigerant flowing therethrough so that heat extracted from the refrigerant flowing through the refrigerant-water contacted coil accumulates in the water flowing through the closed loop water circulation circuit;
• and,
• an outdoor ventilation system for supplying outdoor air to the zones served by the cooling and heating unit;
• the improvement which comprises:
• at least one water-air contacted coil disposed in liquid flow communication in the closed loop water circulation circuit and selectively in heat exchange relationship with only a ventilation air stream flowing in the outdoor ventilation system for selectively heating only outdoor ventilation air before the outdoor ventilation air is discharged to the served zone continuously;
• and,
• means for allowing a selected amount of outdoor ventilation air to pass through the water-air contacted coil and allowing a selected amount of outdoor ventilation air to bypass the water-air contacted coil.