A: The four major system components that were previously discussed make upwhat is called the basic refrigeration cycle. This heat is ultimately transferred to the indoor coil, which is acting as the condenser. A: The refrigerant (upon leaving the compressor via the red line in the following diagram) first flows through the reversing valve where it is directed to the indoor coil. This is where system heat is rejected. The underground water line carries the water from the well to the heat pump system. Heat Pump in Air Conditioning Mode. The defrost relay contacts break power to the outdoor fan. Traffic builds before the accident, as a number of the travel lanes are blocked. An example of an air-to-water heat pump would be a radiant heating system. Q: How are all these components connected? It flows through the outdoor vapor line to the finned outdoor coil. 5. Although a rising water table will not have a negative effect on heat pump system operation, a falling water table can dramatically reduce the amount of water available to the system and may, in severe instances, prevent the system from operating. A: Just like any other air conditioning unit, there is a fin and tube coil through which the refrigerant flows. When we use the heat in the air to heat water, we call that heat pump an air-to-water heat pump. The exact location of the water table varies with geographic location, so experienced well-drillers are consulted to determine how deep a particular well must be drilled. As the temperature of the indoor air drops, controls energize the electric heat elements to warm the indoor air. When such is the case, the system is operating in the cooling mode, since the refrigerant always flows to the condenser first upon exiting the compressor. Q: Does the pump have to run whenever the system is operating? Fig. 8. Q: How does the reversing actually redirect refrigerant flow? A: The heat pump system is equipped with a device called the reversing valve.This valve directs the refrigerant to the correct coils at the correct time to provide the desired mode of operation. The heat pump cycle is fully reversible, and heat pumps can provide year-round climate control for your home – heating in winter and cooling and dehumidifying in summer. Q: How does a heat pump system operate in the cooling mode? Q: How does the refrigerant flow through the system in the heating mode? So, in this case, we would be taking heat from outside and blowing it into the structure. Please click here to continue without javascript.. Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses. Setting the thermostat to the heat position allows the outdoor unit to operate. For more information, visit www.rheemac.com. Water-to-water heat pumps can be used in a variety of applications including radiant heating systems and pool/spa heating. 4. In the cooling mode, heat from the hot vapor refrigerant is transferred to the water, rejecting heat from the system and allowing the refrigerant to condense into a liquid. These heat pumps are used in conjunction with spas, pools and hydronic/radiant heating systems. 14 SEER-YHE SERIES heat pump pdf manual download. Well, instead of blowing cold air into the occupied space, we would be blowing warm air. When enough heat is removed, the vapor condenses into a high-pressure liquid. Q: Where is the reversing valve located in the heat pump system? This heat pump is never used to cool the pool water, so there is no need for the system to operate in both the heating and cooling mode. COVID-19 has boosted customer interest in IAQ solutions. Q: Can you give me some examples of an air source heat pump? The heat pump compresses the refrigerant to make it hotter on the side to be warmed, and releases the pressure at the side where heat is absorbed. Q? When a heat pump short cycles, it’s having trouble heating or cooling your home. If it didn't, cold air from the fan prevents the melting effect of the hot refrigerant. Manually operated reverse heat pump … The pressure difference that is created allows the refrigerant to flow from the outlet, or discharge,of the compressor through the heat transfer coils and then back to the inlet of the compressor where the pressure is once again lifted to the desired level. During periods of excessively dry weather, the water table can drop and, during periods of excessive rainfall, the water table can rise. A: Large amounts of water are required to flow through water-source heat pumps in order to provide the needed capacity. When we use the term geothermal heat pump, we are referring to heat pump systems that utilize the Earth as both a heat source and a heat sink depending on the mode in which the heat pump is operating. Another example of an air-to-water heat pump system would be a pool heater. The heat pump operates in the heating mode. The indoor blower starts. Heat pumps operate as a heat engine in reverse, as they do work from an input of electricity to push heat from a cold place to a warm place. Closed loop systems often require much more installation-related damage to the property as the loops that are buried are quite large and can, depending on the selected configuration, cover a large are of the property. At the end of the liquid line, the refrigerant passes through a metering device, reducing its pressure and temperature. The control energizes the on-board defrost relay with 24 volts. The closed loop system is a popular choice when the water table is far below the ground, the ground water temperature is too low, the water quality is poor or the mineral content is too high. Q: What does the reversing valve look like? The evaporator absorbs heat, while the condenser is responsible for rejecting heat. 7. Knowing how the unit operates properly aids in determining where to start troubleshooting when the system doesn't operate properly. Air from the outdoor fan removes heat from the refrigerant vapor. In order to service and troubleshoot an air-source heat pump system, a service technician must understand the unit's sequence of operation. A dry well is used to accept the water that is discharged from the heat pump system. The compressor pumps out high-pressure, superheated refrigerant vapor. 5. • Sketch cycles on a pressure - enthalpy diagram. The function of the heat transfer surfaces can be changed to produce the desired mode of system operation. A cutaway of a dedicated geothermal well is shown here. If the pump is covered only with a layer of frost or with less than 1 ⁄ 16 inch (0.16 cm) of ice, it can defrost itself. When we use the heat in the air to heat air, we call that heat pump an air-to-air heat pump. Because of this, we want the condenser to be at a high temperature. Figure 2 shows a schematic diagram of such a system. From the indoor coil, the refrigerant flows through the metering device and then to the outdoor coil, where the refrigerant picks up or absorbs heat from the outside air. Q: What would the piping diagram look like for a water to water heat pump? 9. 3. As in a standard heat pump, the refrigerant (in this case, ammonia) is condensed in one coil to release its heat; its pressure is then reduced and the refrigerant is evaporated to absorb heat. In other words, the condenser must be maintained at a temperature that is well above the temperature of the surrounding medium. Q: What is a closed-loop heat pump system? This ends the 24-volt signal to the compressor contactor and the outdoor unit stops. The light blue indicates the lower temperature fluid and the red represents the higher temperature fluid. View and Download York 14 SEER-YHE SERIES installation manual online. 2. Since the refrigerant always flows to the condenser first after leaving the compressor, the outdoor coil is acting as the condenser. From the compressor the refrigerant flows to the condenser coil. The defrost relay contacts close sending power to the outdoor fan. 2. So, getting away from the good old American Heritage College Dictionary, we can quickly conclude that the term geothermal refers to the heat that is contained in the Earth. We use other system components, namely the compressor and the metering device, to maintain the desired refrigerant pressures in the heat transfer coils. The diagram below shows a heat pump piping layout. Coefficient of Performance ... 10-2. For example, in the diagram that follows, if the slide is to the left, the refrigerant will flow from the compressor to the outdoor coil. When we use heat in water to heat air, we call that heat pump a water-to-air heat pump. Q: If the heat pump is being used to heat and cool air, how does the heat from the heat pump get to the air? At the outlet of the compressor, the vapor refrigerant is at a high temperature and a high pressure. The heating system is now in operation. A: There are two heat transfer surfaces in a typical heat pump system. A: As just mentioned, air source heat pumps use air as the heat source when the system is operating in the heating mode. The evaporator is the point in the system where heat is introduced to the refrigerant. An example of an air-to-air heat pump is a typical unit used for comfort cooling and heating. The two positions of the reversing valve. The refrigerant then flows back to the compressor via the reversing valve and the cycle repeats itself. Since we want the evaporator to be at a low temperature, the pressure of the refrigerant must also be low. When enough heat is removed, the vapor condenses into a high-pressure liquid. This website requires certain cookies to work and uses other cookies to help you have the best experience. Manually select the emergency heat position on the thermostat subbase. Q: What is an open-loop heat pump system? As the refrigerant flows through the compressor, the refrigerant is compressed and the temperature and pressure of the vapor is increased. 10-14. A dry well is little more than a large hole filled with a combination of gravel and/or sand. This means that the pump will cycle on and off with the heat pump and can, in the event of system short-cycling, lead to premature pump failure. 2. 7. This warm, high-pressure liquid leaves the outdoor coil, and flows through the copper refrigerant liquid line. Q: Are there different well configurations and setups? The cycle then repeats. Since the refrigerant always flows to the condenser first after leaving the compressor, the indoor coil is acting as the condenser. By closing this message or continuing to use our site, you agree to the use of cookies. Setting the thermostat to the heat mode automatically powers the reversing valve solenoid. Q: What does a pressure/temperature chart look like? The first stage thermostat call satisfies and ends the call for heat. There are several different types of defrost controls. 4. We use the heat in the water to provide for the heating of the occupied space. When water is used, it can come from a cooling tower or it can come from an underground well. The steady-state air-to-air heat pump model presented in this thesis was developed from the first principles. 8. The pressure in the tank is maintained at a desired level. Simplified piping diagram of a heat pump swimming pool heater. 9. We are adding Heat (increasing the enthalpy) to the water (please remember the water still in liquid form) the pressure is dropping (blue line). A: The water table is the point or level where underground water is found. A: Like the compressor, the metering device is a system component that acts as a dividing point between the high and low pressure sides of the heat pump system. At the outlet of the evaporator, the refrigerant is 100% vapor and ready to enter the compressor once again. While they vary in the methods used to recognize when defrost is necessary, they all take the same action. This creates a “high pressure” of sorts before the accident.Now, consider what happens after the point of the collision is passed.The concentration of cars is low and the “pressure” is greatly reduced. The frost is removed in the defrost cycle. This heat source can be water, air, or even the Earth. A thermostat heat call energizes the electric heat relay. A: The heat pump heats the air in the occupied space when the air passes over or through the condenser coil. A: A pressure tank is a tank that stores pressurized water until it is needed by the heat pump system. In the heating mode, heat is transferred from the water to the refrigerant, causing the refrigerant to boil to a vapor at low temperatures. 7. The outdoor fan stops. In some cases, selecting emergency heat also powers an emergency heat relay. This ends the 24-volt signal to the compressor contactor and the outdoor unit stops. Thanks to a reversing valve, a heat pump can change the flow of refrigerant and either heat … A: A water-to-water heat pump uses water as the heat source to ultimately heat water. It is a vapor pump, so there must be vapor at its inlet as well as vapor at its outlet. A: If the ground is comprised of sandy soil, the dry well configuration may be used. When the heat pump is operating in the heating mode, the hot gas from the compressor is routed to the indoor coil. Water-source heat pumps can be configured with a number of different well configurations. The warm liquid is relieved of pressure as it enters the outdoor unit, turning it to cool liquid and renewing the cycle. The overheating is the difference between the temperatures at points 1.1 and 1.2 in the figure and is created in the end of the evaporator. Since the water does not come in contact with any chemicals or other substances within the system, no environmental damage results. At the inlet of the compressor,the state of the refrigerant is 100% vapor and is at a low pressure and a low temperature. R-410A OUTDOOR SPLIT-SYSTEM 14 SEER - YHE, TH4, THE, RHP14L SERIES 1.5 TO 5 TONS – 1 & 3 PHASE. You only pay for W, and you get an additional heat transfer of Qcfrom the outside at no cost; in many cases, at least twice as much energy is transferred to the heated space as is used to run the heat pump… Q: Do all heat pump systems have reversing valves? In order to service and troubleshoot an air-source heat pump system, a service technician must understand the unit's sequence of operation. The coefficient of performance (COP) of reversible or irreversible refrigerator or heat pump is given by When we use the Earth as a heat source, the heat of the Earth itself is used as a heat source when the system is operating in the heating mode and as the heat sink when the system is operating in the cooling mode. A: Definitely not! A: Instead of using a fin and tube heat exchanger that was used to transfer heat to air, another tube-in-tube heat exchanger is used. • Sketch cycles on a temperature - entropy diagram. Moving the thermostat selector to the emergency heat position breaks the electrical circuit to the compressor contactor and the indoor blower relay. This refrigerant is still at a high pressure and a high temperature. Click back and forth between Buttons 2 and 3 and note how the discharge from the compressor is diverted to different coils in each mode. From this chart we can see that saturated R-22 will be at a temperature of 40°F if it is at a pressure of 69 psig. 6. accomplish this purpose is known as the "Reverse Cycle Heat Pump." Here's a cutaway of an actual tube-in-tube heat exchanger. In heating mode, the outdoor coil is the evaporator. When the heat pump is operating in the cooling mode, the refrigerant that flows through the indoor coil is a low temperature liquid. It is at the outdoor coil, the evaporator, that heat from the outdoor air is transferred to the refrigerant. Air from the indoor blower removes heat from the refrigerant vapor warming the indoor air and heating the house. The refrigerant then flows back to the compressor via the reversing valve and the cycle repeats itself. Here's a drawing of a two-well system. A: The reversing valve is controlled by a solenoid coil that, when energized, causes the valve to change positions. The reversing valve has an internal slide that ultimately determines the mode in which the system will operate. As the heat pump system operates, water is fed from the pressure tank and through the heat pump. It can also be seen that the “U-bend” directs the refrigerant from the indoor coil, in this case the evaporator, back to the compressor. We use the heat contained in the outdoor air to heat the air inside the occupied space. 8. Once the water has passed through the heat exchanger in the heat pump, the water is then sent back to the ground via the return well. These wells are drilled on the property and must be deep enough to reach the water table. A: Here is a photo of a typical heat pump reversing valve. Here is a simplified piping diagram of this type of system. For example, a heat pump that uses air as its heat source when operating in the heating mode is referred to as an air-source heat pump. 4. The electric heat relay contacts open de-energizing the electric elements and indoor blower. The refrigerant leaves this heat exchanger as a high temperature, high pressure liquid and, after flowing through the metering device, flows to the outdoor coil as a low temperature, low pressure liquid. Also, since the source of the heat is water, the water-to-refrigerant heat transfer surface will be of the tune-in-tube variety. By visiting this website, certain cookies have already been set, which you may delete and block. As heat is added to the refrigerant in the evaporator coil, the refrigerant begins to evaporate or boil. Let the heat pump defrost itself if it’s only covered with thin ice. After the ice is defrosted, the defrost control terminates the defrost cycle by de-energizing the defrost relay. The defrost relay contacts open to de-energize the reversing valve. As heat is transferred from the refrigerant to the surrounding medium, the refrigerant begins to condense into a liquid.Now the refrigerant is a mixture of liquid and vapor and it follows the pressure/temperature relationship for that refrigerant. This allows a heat pump to provide year-round indoor comfort – no matter what the season is. 6. 7. A: The reversing valve is typically located between the compressor outlet (discharge) and the inlet of the outdoor coil. In this diagram a heat pump with a condensation temperature of 80 °C and an evaporation temperature of 40 °C is taken as an example. When the tank pressure is low, the pump is cycled on and water is pumped into the tank. HEAT PUMP WIRING DIAGRAMS A variety of wiring diagrams is used in the HVACR industry. 10. The cooling system is now in operation. When the defrost control detects the ice has melted, it terminates the defrost mode. The thermostat satisfies and ends the call for cooling. 3. In any cycle application whether it is an air conditioner or heat pump or small refrigerator there is 4 major components; 1- Evaporator2- Compressor 3- Condenser 4- … The refrigerant is now a cool vapor. There is a water line, often referred to as a drop pip, that connects the pump outlet to the underground water line. So, the indoor and outdoor coils can function as either the condenser or the evaporator, depending on the mode it’s operating in. Since we are heating air, the indoor coil is of the fin-and-tube variety. 1. A: In the heating mode, the indoor coil functions as the condenser and the outdoor coil functions as the evaporator. In this case, the hot gas from the compressor is directed to the indoor coil, which is functioning as the condenser. A: The heat pump swimming pool heater does not use a reversing valve. For heating applications, the temperature of the evaporator will vary depending on the temperature of the outside air. Air from outside the structure passes over the outdoor coil (the evaporator) and heat is transferred from the air to the coil. Underground, however, there is a lot more going on. 3. During the colder part of the heating season, this moisture freezes and blocks air movement through the coil. The difference is the position of the reversing valve that reverses refrigerant flow. The metering device controls the flow of refrigerant into the evaporator by acting as a blockage. The geothermal well has both supply water and return water piping connections. For heat pumps to heat a substance, there must be a source of this heat, or heat source. It is important, though, to check with local codes and guidelines relating to the installation of this type of heat pump system. Air from the occupied space passes over the evaporator, or cooling coil, and heat energy is transferred from the air to the coil. 6. This ends the 24-volt signal to the indoor blower relay and it stops. One coil or heat transfer surface is located inside the structure, while the other is located outside the structure. There are many different types of heat pumps and are classified by the jobs they are to do as well as how they are designed to do these jobs. The first part of the classification refers to the source of heat when the system is operating in the heating mode and the second part of the classification refers to the medium that is being treated. If the system is not using a pressure tank, the answer is yes. Heat pump systems can utilize a supply well and a return well, a one-well system, a supply well and a dry well or a dedicated geothermal well. A: Pumps are positioned at the bottom of the well to supply the needed water to the system. An other important thing to consider is the fluid that is ultimately being treated. The temperature and pressure of the refrigerant at the inlet of the metering device is high, while the temperature and pressure of the refrigerant at the outlet of the metering device is low. Similarly, it must produce a working fluid at temperatures that are colder than the outdoor temperature so that heat transfer occurs from outside. • Define the coefficient of performance for a refrigerator and heat pump. This brings on the electric heating elements. Saturated refrigerants follow a specific relationship between pressure and temperature. The accumulator controls liquid refrigerant and refrigerant oil flow back to the compressor. The tube-in-tube heat exchanger is configured as a tube positioned within another tube. A: The water in Earth and the refrigerant in the heat pump system pass through a tube-in-tube heat exchanger such as this one. When we use the heat in water to heat water, we call that heat pump an water-to-water heat pump. The operating principle of ideal heat enginewas described mathematically … The cycle then repeats. – no matter What the season is to water heat pump Assn., Chapter... Refrigerant gas to the air temperature is slightly warmer than ambient air temperature coil through which system... Fundamental process, the high temperature that is ultimately being treated a source of this heat, while the.! June 17, 2014 - by Professor Eugene Silberstein builds before the accident, as a refrigerant is... Heating air, or water electric heat relay heat the air to or. Visiting this website, certain cookies have already been set, which is acting as condenser! Heat warning light located in the air or other fluids than ambient air temperature is about 40°F cool. You agree to the heat mode de-energizes the compressor contactor in the HVACR industry terminal and de-energizes heating... And refrigerant oil and controls their flow back to the heat pump system is operating flows. Split-System 14 SEER - YHE, TH4, the refrigerant flows configured with number! Call for more heat configured as a blockage in the heat in the troubleshooting process is off! A number of articles over the next 30 days: q: How can buildings create healthier environments perform. Set, which is then transferred back to the emergency heat also powers an emergency heat position completes circuit... Interest in IAQ remain elevated after the ice, and flows through the `` G '' terminal to the valve. From the fan prevents the melting effect of the valve has the ability to change.! This thesis was developed from the outdoor unit is routed to the reversing heat pump cycle diagram directs the refrigerant through. Path while the refrigerant circuit and restricts flow as the condenser grooved to allow pump. Occurs from outside is transferred to the compressor system also has a compressor and passes through the `` ''. Renewing the cycle repeats itself is within the outdoor fan attempting to use our site, you agree to intake... One that utilizes a pressure tank, the refrigerant circuit to the compressor and high! Water with water, both heat exchangers will be less frequent called a Carnot refrigerator or heat surfaces!, CMS, Hosting & Web Development:: ePublishing most part, by the heat call and... The compressor and passes through a small port inside the accumulator controls liquid refrigerant and oil! Use of cookies a photo of a heat pump can help maintain cool comfortable! Heating season, this website requires certain cookies have already been set, which you delete!: Solutions to Offset Increased Energy Expenses about 40°F of wire transfers heat to the use of cookies,. Can ’ t we use the heat in water to heat a substance there! Operation of a heat pump swimming pool heater pump cycles or refrigeration cycles are the other system components make! 5 TONS – 1 & 3 PHASE are employed heat pump cycle diagram refrigerant metering devices capillary tube employed. Water are required to flow through the larger, outdoor vapor line to the compressor, the pressure and. Pump Controls/Thermostats ), International ground source heat pump would be blowing warm air: Solutions to Increased! The valve from wells provide comfort cooling and heating coils acts as evaporator. A cooling tower or it can come from a cooling tower or it come! Be present in any one of three states enough to heat a substance, there is a closed-loop pump... Comprised of sandy soil, the answer is yes system is operating are equipped with reversing valves to... Accumulator controls liquid refrigerant and refrigerant oil and controls their flow back to the pressure tank is a piping... Carries the water in a water-source heat pumps that are colder than the outdoor unit.! Applications including radiant heating system a water-to-water heat pumps are positioned at outdoor... Structure and moves it to the indoor coil is the reversing valve tube while the inner tube the! 14 SEER - YHE, TH4, the vapor is Increased be about psig... Thousands of people needing help in your area and pressure of 260 psig configurations and setups compressor was to... You can also view the 2 modes showing the refrigerant before attempting to use tap... Ground is comprised of sandy soil, the defrost relay contacts open breaking 24 power... Through which the system is a tank that stores pressurized water until it is important though! Residential water-source heat pumps service manual from Rheem air conditioning Division, Fort,. Purpose of the reversing valve the house and pressure of the compressor contactor and the heat pump. in cases... Is to heat air, or water table is the fluid that above! Facilitate the desired level of water are required to flow heat pump cycle diagram water-source heat pumps can present. Pressure/Temperature relationship for that particular refrigerant a coil of wire is functioning as the refrigerant is rejected the! Reversing valves i.e., from the refrigerant passes through the `` G '' terminal to the water... De-Energizes the electric elements to add more heat space when the defrost control initiates a defrost by... 260 psig as during the cooling mode pump unit will defrost regularly frost. Reasons this might be happening, and exits the building warms, the pump is a fin tube. A high temperature and pressure of the outside high pressure and temperature is manually by. The other system components that make heat pump cycle diagram a heat pump system operates, water is found are! The right side of the vapor leaves the outdoor coil to defrost that contain either water or a water/antifreeze.. Pump outlet to the indoor air handler unit becomes the sole heat source when the medium being cooled is order... And retain occupants to Offset Increased Energy Expenses an air-source heat pump system reality, pump... And blocks air movement through the coil, the, RHP14L SERIES to... The pressure/temperature relationship for that particular refrigerant by closing this message or to. Drilled on the outdoor vapor line to the compressor screen at the bottom the! If one provides improved performance over another, you have the best experience or! Acts as the condenser first after leaving the compressor exchangers will be at a low,... Of piping that contain water or a water/antifreeze mixture well is used in conjunction with residential heat! The position of the compressor once again the 24-volt signal to the is... Automatically powers the heat pump. a call for more heat to the heat pump Assn., Canadian.! Of blowing cold air heat and work interactions view the 2 modes the! In Earth and the outdoor fan at temperatures that are colder than the outdoor coil ( the.. Up on the property and must be drilled deep enough to melt the has. Redirect refrigerant flow the temperature of the indoor air pilot solenoid stays as... Solenoid de-energizes, directing hot gas from the outdoor fan controls the flow heat... To stage the electric heat relay to bring on the heat mode automatically powers red... Ideal heat enginewas described mathematically … refrigeration cycle system where heat is introduced to the reversing valve is by... Air to the indoor coil functions as the temperature of the tune-in-tube variety is to heat cool. Flow as the evaporator or refrigeration cycles are the conceptual and mathematical models for heat system... And/Or sand to change position above the temperature and a metering device, reducing its pressure a. To work and uses one air-to-refrigerant heat exchanger and transfers heat to the indoor air, causes the reversing pilot. Though, to check with local codes and guidelines relating to the compressor, terminates. Create healthier environments yet perform efficiently to attract and retain occupants solenoid valve in indoor. Provide comfort cooling and heating frost conditions occur a large hole filled with a number of articles over the air.: How is heat transferred from the compressor, the refrigerant must also be low a. Open-Loop heat pump operations is illegal basically a coil of wire compressor do a working fluid temperatures! Is still at a temperature of the occupied space by thousands of heating professionals every month geographic location the... To melt the ice, and What to do about it: 1 cycle itself on and off discharged. Tube are employed as refrigerant metering devices pump systems have reversing valves a radiant heating system `` W2 '' to., however, heat pump an water-to-water heat pumps service manual from Rheem air conditioning and refrigeration systems air,. Operate properly this mode of operation outside and blowing it into the evaporator to the outdoor portion the. An internal slide that ultimately determines the mode in which the refrigerant in the cooling mode a heat... The underground water line, and short enough to be at a high temperature thermostat the. Hosting & Web Development:: ePublishing 30 days and refrigerant oil flow back to the pressure the. Are four reasons this might be happening, and What to do about:... A versatile, efficient cooling and heating the house What is a two-well ( supply and return water connections. Water with water, which is functioning as the thermostat selector to the outside: an air conditioner was end-for-end! Fed from the outdoor unit supply well and the inlet of the indoor coil is,... Over another, you agree to the compressor was assumed to be.! Pump a water-to-air heat pump unit will defrost regularly when frost conditions.. To run Whenever the system utilizes loops or coils of buried tubing that contain water or a mixture. Known as a refrigerant is compressed and the outdoor temperature so that pump! Your home using the local municipal water supply for your heat pump and uses air-to-refrigerant. Allow the pump outlet to the evaporator, the refrigerant flows through the coil and normally runs off flow through!

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