Checking Compressor Superheat
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- čas přidán 25. 06. 2021
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There are many system checks you need to take in consideration when you are troubleshooting a system and one of the most important check is compressor superheat. How you take this check is by taking a temperature reading 6 inches (150mm) from the compressor suction service valve and subtract the converted pressure the dew point temperature.
Example (R449): You have 30F temperature 6” from suction service valve and your pressure is 47 psig which converts to 22F you have 8F superheat. 30F-22F=8F
Example (R449): You have -1C temperature 150mm from suction service valve and your pressure is 3.26 bar which converts to -5.5C you have 4.5K superheat. -1C-(-5.5C) = 4.5k
Would check ideally on each service visit or when previously looked at by others engineers as historical faults not always cured as has in past experienced engineers keep topping up oil level faults and I fault system with low superheat and evaporator was storing the oil, corrected superheat and oil start flooding Bach to compressor and extra added oil had to be removed.
Yes that is why understanding the system you are working on is very important. Thanks for sharing.
I love these videos. Definitely helping! Thanks, brother!
Glad to hear it!
Great video as always, been binging your videos, great info. Always check my SH after a defrost on commission when the txv can be all over, and especially on 449 systems
That is very smart and so important with high glide refrigerant like R449.
I was expecting you to show us how to check compressor superheat. You pointed in the direction of the compressor, but you can barely see it. Also, where do you place the temp clamps? Thank you.
If you pause it at 1:04 I point to the both location to check superheat on that system. Measure the suction service valve pressure and the temperature with a temp probe 6" or 150mm from the valve.
Thank you Trevor. however the 2mins video is not enough for us from you again. please increase it I am greatly from your teaching
You have asked and you shall receive. More to come.
Hi, what should be my superheat at the compressor for cooler and freezer ? 15 for cooler and 8-12 for freezer?
Usually lower than that. Cooler 5-10F, Freezer 2-6F and this all depends on the design, length of runs and protection components in the system. I would find out from the evaporator coil manufacturer and ask what superheat do they run most efficiently.
@@RefrigerationMentor that’s in the evaporator right ? Because at the compressor, the super heat numbers are way too high. What’s your thoughts on alternative superheat ? Like taking temperature measurements between one of the distributor and suction line outlet. Using thermometer only
@@abazism I have heard of people having success with checking that way but I have not use that method in the field personally. I would love to see your results from both scenarios comparison.
I check superheat at the compressor every time im working on equipment. Also if the superheat in to the compressor is to high it will decrease effiency of the compressor. I like to see a difference of 7-13 Kelvin on the compressor. What do you think?
Yes the is in the safe limit of most compressors but you always need to follow up with the compressor manufacturer but with CO2 that could be too low.
I just started working in a CO2 recovery plant. What is the safe superheat temperature for CO2 compressors. I have been trying to get figures but unfortunately we have no manuals in existence.
@@RefrigerationMentor I would also appreciate if you could point me in a direction where I could get to read more about Suction superheat and discharge superheat and their importance to compressor health.
Very un informative video