A heat pump has a reversing valve, two metering devices and two bypass valves. This allows the unit to provide both A/C and Heat. The diagram above shows a HP (heat pump) in cool mode. The cycle goes like this; 1  The compressor (1) pumps the refrigerant to the reversing valve (2).
Union Gap, Washington. Union Gap redirects here. For the music group, see Gary Puckett & The Union Gap. Union Gap is a city in Yakima County, Washington, United States. As of the 2010 census, the city population was 6,047. Union Gap has a storied history and in recent years has become the retail hub for the entire Yakima Valley as a result of Valley Mall and other thriving businesses being located here.
Interstate 82 opened between Ellensburg and Yakima in 1971 and between Union Gap and Zillah by November 1981.1 The freeway replaced the routing of U.S. 97 northward to Interstate 90 and southward to Union Gap. U.S. 12 follows the freeway from Berglund eastward to the Tri-Cities and Interstate 182.