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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation The piston will then seal port of left capillary. Once again, pressure on two sides of piston will equalize and valve will remain in this position throughout the heating cycle. The slide port will straddle suction tube and tube to outdoor coil. The tube to indoor coil will be open to discharge tube through main body of valve. REFRIGERANT CIRCUIT APPLICATION If a reverse cycle valve is placed in a refrigerant circuit, result will be the configuration shown in Figure 26F03A. Note reverse cycle valve is in cool position. Refrigerant flows from indoor coil, through loop of "RC" valve to suction of compressor, then discharge from compressor, again passes through "RC" valve to outdoor coil. The only component missing here is some type of expansion device between outdoor indoor coil. Figure 26F03A Energizing solenoid coil causes slide to shift into heat position. Refrigerant flow is then from outdoor coil, through loop of "RC" valve, through suction line, to compressor, out of compressor through discharge line, through "RC" valve to indoor coil. Note that indoor coil is condenser and outdoor coil is evaporator. Circuitry shown in Figure 26F03A is basic in all heat pumps. Liquid line and expansion devices are purposely omitted because they are components which change in various types of heat pumps. EXPANSION DEVICE APPLICATION Capillary Tube If a capillary tube were superimposed on a basic circuit, as shown in Figure 26F03B, a complete heat pump refrigerant circuit would now exist. The capillary would be used as expansion device with "RC" valve in position for cooling cycle. This basic circuit, except for reversal of "RC" valve is used for heating cycle. Service Application Manual SAM Chapter 620-54 Section 18 4PDF Image | BASIC HEAT PUMP THEORY INTRO
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