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Heat Pump Reversing Valve.pdf

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  http://www.heatpump-reviews.com/Heat-Pump-Reversing-Valve.html#gallery[pageGallery]/3/  Heat Pump Reversing Valve   The heat pump reversing valve is the only difference between the heat pump and standard air conditioner. Previously we have talked about how a heat pump works. We concluded it works just like an air conditioner, moving heat from one place to another. But the heat pump reversing valve allows us to move the heat from inside the house to the outdoors (cooling mode or to reverse the cycle and remove the heat from outside the house to the indoors (heating mode.   But how does it really work! nd what does it look like! That#s what we are about to discover in this section.   $irst let#s see what a heat pump reversing valve looks like. %n the figure below, you will notice the valve has & tubes or connections' , B, , ). This valve is also referred to as a &*way valve.     heat pump reversing valve is an electro*mechanical &*way valve that reverses the refrigerant ($reon flow direction, using an electrical magnet. %t works very similar to your washer#s water valve or solenoid valve (pictured below. When you connect electricity to a valve (energi+e it, it opens and lets water in and when you disconnect the electricity (de*energi+e it, it closes the valve and the water stops flowing.      When you energi+e the coil with electricity (in the - , washer#s water valve use /0 , and in most other countries, they use 11/0  the coil becomes magneti+ed, pulling a pin and compressing the spring. This action opens the valve to let the water flow. When you de*energi+e the coil the electrical magnet loses its magnetic power, and the compressed spring e2pands and pushes the pin back to shut off the water.   The washer#s water valve (solenoid valve is 1*way valve, and in the 3eat Pump, the reversing valve is &*way valve. 4et#s look at the image below so we can understand it better.   ã   Energized mode, cooling mode   The heat pump reversing valve has & large tubes ( , B, , )  that#s why they call it a & way valve and it also has5* capillary tube (, capillary tube (1, capillary tube (6, slider (&, block (7 ,electrical coil (8, electrical magnet (9, and spring (:.    ;otice that the compressor#s discharge port (high pressure is always connected to tube in the reversing valve and the return port (low pressure in the compressor is always connected to tube B. Therefore tube always has higher pressure refrigerant, and tube B always has lower pressure refrigerant. ;otice also that capillary (1 is always connected to tube , thus capillary (1 also has a high pressure.   When we energi+e the electrical coil (8 it energi+es the magnet (9 that pulls the block (7 which will blocks the capillary tube (6 and compresses the spring (:. Wow if that was confusing, well if it was, please read it one more time.   <ot it! <reat, so notice that the capillary tube (6 is now blocked, and the high pressure refrigerant will flow from capillary (1 to capillary (  straight to the left side of the heat pump reversing valve#s body that will push the slider to right hand side from the valve#s body which will allow the high pressure refrigerant to go from the tube to tube ) to the outdoor coil, through the metering device to drop its pressure, then to the indoor coil to cool the inside of the house ( cooling mode  then back to tube  .   %f you had notice the slider has a top grove which allows the low pressure refrigerant to flow from tube  to tube B then back to the return port in the compressor to repeat the cycle again.   That was easy wasn=t  it! ;ow let#s see what happens in heating mode in the figure below.   ã   De-energized mode, heating mode    Please notice that the coil (8 lost its power, or de*energi+ed, which makes the electrical magnet (9 lose its magnetic power. When this occurs, the spring (: will decompress and push the block (7 to the left, and block the capillary tube (. % am thinking you are becoming an e2pert by now>   The capillary tube ( is now blocked and the high pressure refrigerant will flow from capillary (1 to capillary (6 straight to the right side from the reversing valve#s body. This in turn will push the slider to the left hand side of the valve#s body, which will allow the high pressure refrigerant to go from the tube to tube . This allows refrigerant to flow to the indoor coil to heat the inside of the house (heating mode, then through the metering device to drop its pressure then to the outdoor coil then back to tube ).     gain the slider has a top grove this will allow the low pressure refrigerant to flow from tube ) to tube B then back to the return port in the compressor to repeat the cycle again. That#s it that#s how the heat pump reversing valve works in real*life.   We should notice some important stuff5   ã   When we energi+e the reversing valve we start the cooling mode, and when we de*energi+e it, we start the heating mode. %s this always  the case or can it be the other way around!  ?es of course it can. 3owever, in almost all 3eat Pumps, the cooling mode starts when we energi+e the reversing valve, so if the electrical coil fails (and it cannot energi+e the reversing valve anymore you will be able to have a heating function and you won#t free+e your butt off.   ã     ll reversing valves use 1&0  to energi+e, unlike a washer#s water valve which uses either /0  or 11/0 .   ã   @eversing valves use the difference between high and low pressure refrigerant to work, the compressor should be working in order for the reversing valve to work properly. ã   AA of the reversing valve failures are due to bad or faulty electrical coil and not because the valve itself has failed. -o the ne2t time an air conditioning service man tells you that you need to change the reversing valve, chances are he doesn=t  know what he is talking about or he want to rip you off. .   ã   @eplacing the reversing valve could be a complicated process. %t needs a very skilled person, because the reversing valve will be soldered, which can easily overheat the reversing valve#s body, and in turn melt the slider inside it, making it inoperable.   ã   if you really need to replace your valve, and your unit is over / years of age, please consider replacing the 3eat Pump.   ã   The heat pump reversing valve itself might cost $200-$250 however, it will take a lot of work ,1st the technician must recover all the refrigerant (Freon) in the approved and certified container , if he lets it out to the air or like a lot of them do into a bucket of water that’s violation to the law (it could cost him $10,000 if you report him) , after he needs to take out the electrical coil then takes out the old reversing valve and buts the new one in and soldered it carefully, then vacuum the system and make sure there is no leaks , then charges it back with refrigerant (Freon). All that will take time and effort but it should not exceed than $900 and as always if you end up doing any repair work only deal with people charge by labor and material and not lump sum. Well that#s it folks % hope you have a better understanding of the heat pump reversing valve. s always the more you know the less likely you are to get ripped off>  
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