| 摘要 |
A heat pump is provided with a single expansion device a pair of four-way reversing valves. One of the reversing valves routes the refrigerant from the compressor to either an outdoor heat exchanger or indoor heat exchanger, as well as routes the refrigerant back to the compressor. The second four-way reversing valve receives refrigerant from one of the heat exchangers and properly routes it through a common expansion device in a single direction. The two four-way reversing valves are controlled dependent on whether the heat pump is operating in a cooling or heating mode. A single expansion device sensor is positioned on a suction line, which receives refrigerant on its way back to the compressor from the first four-way reversing valve. The present invention thus eliminates the prior art requirement of additional components, enhances control and reduces system cost.
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