Which in this case is the compressor. The refrigerant vapour is now starting to condense inside the compressor and slowly the sump oil becomes diluted with liquid refrigerant. At this point the liquid in the sump oil literally explodes out of the oil causing the crankcase to fi ll with refrigerant foam and oil droplets.
The system is in the off cycle, however, during this period refrigerant has migrated to the compressor and mixed with the oil. Note the pressure gauge. This vapour will increase rapidly in its volume and prevent oil reaching the furthest bearings and con rods away from the oil pick up point. These bearings quickly run dry and overheat. Sometimes on smaller machines the main front or motor end bearing will seize and stall the motor.
On larger machines the powerful motor often continues to spin the crankshaft and then the upper most con rods seize onto the crankshaft and as the crankshaft continues to 2 Lit. Liquid fl ash off has washed the lubrication from the bearings, in this case we can see where the con rod has seized to the bearings by welding of aluminium from the con rod to the bearing surface. In smaller compressors this type of seizure will most likely stall the motor. Due to the fl ash off of liquid refrigerant washing lubrication from the bearings when seizure of the con rod on the crankshaft occurs the motor continues to spin breaking the con rod.
The broken con rod often smash into the piston causing further damage. These metallic particles can be thrown around inside the machine and can damage the motor insulation and cause a spot burn or total motor burn out. Flooded starts can often be simply diagnosed by high oil levels seen in the oil level sight glass, and during the start up mode the oil is seen to foam sometimes for only a few seconds, sometimes for a few minutes. The longer the foaming lasts, the more wear and damage is taking place.
Engineers can easily diagnose these signs of Flood back problems, but the compressor failures can often be mistaken for Liquid Flood back or Flooded Starts as the failed components often look very similar under inspection. This mixture is partially Non-Compressible and often causes the suction valves to break, which can lead to broken piston crowns and damaged discharge valves and head gaskets. The mixture of oil and liquid is partially non-compressible and results in broken and pitted discharge valves and even broken piston crowns.
This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifi cations already agreed. E-mail glenn. Short-link Link Embed. Share from cover. There are two sets of coils that help transfer heat through your AC system. If one or both of them are not able to perform this function, it can cause the refrigerant to flow backward into the compressor, which is a recipe for a breakdown.
Due to a number of possible causes, the evaporator coil can freeze up. This will prevent it from being able to absorb heat. The compressor is not supposed to compress anything but refrigerant in its gaseous state. If it tries to pump anything else, it can cause the compressor to break. Other contaminants that can affect your compressor are air, moisture, and dirt.
Moisture, to point out one example, can create rust that will mix with the refrigerant and cause issues in the compressor. Twitter Link. All rights reserved. If this happens, the compressor then has to overcome a higher compression ratio — expend more energy while providing less capacity.
Unfortunately, many home and business owners neglect to have their systems properly maintained, which is why contractors need to educate consumers about the need for routine maintenance. They can also make sure the system was installed properly in the first place by obtaining the correct training for the types of products they are selling.
The learning centers are located throughout the U. Gomez agrees that manufacturer training and support play a key role in ensuring a system is installed correctly, noting that there is no substitute for product-specific training. Methods of refrigerant charging can vary greatly, especially between ducted and ductless systems. That is why for all Fujitsu inverter-driven systems, regardless of type, the refrigerant charge must be weighed in and calculated as a function of the total installed liquid line length, said DeCosa.
This is the only method that may be used, as charging by any other method may result in a significant under- or overcharge. See more articles from this issue here! Joanna Turpin is a Senior Editor. She can be contacted at or joannaturpin achrnews. This website requires certain cookies to work and uses other cookies to help you have the best experience.
By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more.
This Website Uses Cookies By closing this message or continuing to use our site, you agree to our cookie policy. Learn More This website requires certain cookies to work and uses other cookies to help you have the best experience. February 24, Charging Methods Differ By System, Manufacturer Methods of refrigerant charging can vary greatly, especially between ducted and ductless systems.
0コメント