Abstract: The hydronic heating and cooling system includes a packaged or integrated outdoor combination heat and cool unit for both residential and commercial installations comprising control valve means for directing water or liquid through alternately an evaporator for cooling the liquid during the cooling mode of the system or a heater for heating the liquid during the heating mode of the system. With such a construction the liquid passes through the heater in both the heating and cooling modes of the system; however, the heater is energized only in the heating mode.

Abstract: The heating and cooling system for a multiple coil installation includes a bypass passage or conduit provided with a check valve which is closed when the pump of either the heating circuit or the cooling circuit is energized and which is opened when the pumps of the heating circuit and the cooling circuit are not energized whereby a third pump which operates continuously, is effective when the check valve is open to continuously circulate the water in a closed path through the bypass circuit which is interconnected to the inlet and outlet sides of the multiple coil installation, thus bypassing the heating and cooling circuits.

Abstract: A vertical blower coil unit for heating and cooling is provided. The unit includes a pair of parallel vertical passageways one or both of which may have a heat transfer coil means located therein for the passage of cold and hot water therethrough. Inlet damper means are provided to bypass the coil means during times when it is not desired to have air pass thereover for either cooling or heating. A collecting pan is provided beneath the coil means for catching condensate falling from the coil means when cold water is passed therethrough and to act as a water reservoir for humidifying purposes when hot water is passed through the coil means.