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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation Figure 26F04 also shows refrigerant flow on cooling cycle. Refrigerant flow of heat pump will reverse on heating cycle when a "T.X." valve and capillary tube are employed as refrigerant metering devices. Another variation in expansion devices used two expansion valves and two check valves. This circuit operates similar to one pictured in Figure 26F04. Check valve near indoor coil is closed on cooling and open on heating with check valve at outdoor coil operating in reverse. Refrigerant flow in this figure indicates cooling cycle operation. Figure 26F04A shows the refrigerant flow during heating cycle when two expansion valves and two check valves are used. Figure 26F04A Figure 26F04B presents a circuit using two expansion valves, two check valves and the addition of a subcooler and two receivers. Service Application Manual SAM Chapter 620-54 Section 18 6PDF Image | BASIC HEAT PUMP THEORY INTRO
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