Heating Mode

In the heating mode, warm condenser water is diverted through the hydronic coil via a 2-way control valve. The air coil supplies warm air to the conditioned space. The 2-way valve that allows water to flow to the refrigerant-to-water heat exchanger is in the closed position. (See Figure 1 below)

Cooling Mode

In the cooling mode, cold refrigerant flows through the air coil. The heat pump supplies cool air to the conditioned space. The heat removed from the room air is transferred to the refrigerant flowing through the refrigerant coil. (See Figure 2 below.)

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