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Heat Pumps for Heating and Cooling 2.10.3. Liquid Line Drier The nature of heat pumps dictates that some of the refrigerant piping serves a dual purpose. The refrigerant flow in the liquid line of a heat pump actually changes direction. Most air conditioning systems have a liquid line drier mounted in this piping. Heat pumps also have a drier mounted in the liquid line, but it must be of a bi-flow type so that it filters refrigerant flowing in both directions. When the refrigerant piping is fabricated and installed on a split system air conditioner, there are certain procedures that are followed to ensure good oil return to the compressor. These include installation of oil traps and correct pitching of piping as well as the installation of double risers. The fact that heat pumps use the refrigerant piping for different purposes during heating and cooling operations prevents the installer from following these procedures. For this reason, split system heat pumps must be applied and piped strictly according to the equipment manufacturer’s recommendations. 2.10.4. Reversible Valve Heat pumps use an electrically operated valve to switch refrigerant flow. There are currently three different variations of control wiring for heat pumps. These are based upon how the reversing valve is to be controlled. Some manufacturers set up a unit so that it is in the heating mode when the valve is energized. Some manufacturers energize the valve when the unit is in cooling mode. Some manufacturers have the thermostat control the valve operation through the use of an additional control wire and other manufacturers set up their control wiring the same as the standard wiring for a non-heat pump unit. In addition, there are several different control requirements that are dependent on the way electric heaters are to be controlled. As equipment becomes more complex it becomes more expensive to service. This is due to the fact that there are more components to fail and fewer technicians who are capable of diagnosing and making repairs easily. Summarizing.... Compared with other alternatives, ASHPs have the following advantages: • Provide central cooling, heating and hot water. • Simplicity of design and ease of installation and operation. • Compact system and can be easily retrofitted in existing buildings equipped with a conventional heating system. 29PDF Image | Heat Pumps for Heating and Cooling
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