Setting Pressure Switches - HVAC Online Training and Courses
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- เผยแพร่เมื่อ 29 ส.ค. 2024
- In this video, I describe how to set the high and a low pressure switches. Cut in is cut out minus differential, and the other way, is cut out is cut in minus differential. This can be confusing to people but I try to simplify it to make it easy to understand.
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I tried find exactly explain about this pressure setting But no one , your teaching is best on you tube now thank you
Thank for great knowledge l would like ask how set R404a hp and Lp pressure switch for a glass meat freezer also what is normal suction running pressure in psi.
A walk in freezer can have an operating temperature of 0°F or as low as -10°F the suction pressure should be around 24 to 32 PSIG. The freezer the low pressure switch could be set between 18 to 20 PSIG. And it is often suggested to set the high pressure switch around 245PSI. I hope this answers your questions and thank you for watching.
I love your channel
Thank you so much! I hope I can get some new videos for you on here soon!
Thanks. For information
I'm glad that you like the video! I hope to have some more on here soon!
Very.NICE.good.knowledge
Thank you so much! And thank you for watching!
Very good...
Thank you so much! I appreciate your comment and thank you for watching!
Exclusively awesome
Thank you. And thank you for watching!
Very.NICE
Thank you! I'm glad you like the video! And thank you for watching!
What happens if I set my low pressure cut out to 0 bar, and the cut in to 1 bar
Is it will effect of my compressor?
Is it will damage the compressor?
Because I see in the manual instruction
The low purssure cut in is 2,5/3 bar, and cut out 1, 5 /2
Typically it is suggested that you set the low pressure cut out at that pressure because it is designed to protect the compressor from a loss of refrigerant which would cause the pressure to drop. When this happens the superheat would increase and because of that it would overheat the compressor and burn the compressor out. If the superheat stayed at the correct temperature then it would not be a problem setting it to lower pressure but most likely the superheat is going to increase and it would kill your compressor. I would not set it lower than what the manufacturer suggested. Good luck and thank you for the question!.
Thanks..
Thank you!!!! glad you liked it!!!
I am trying to set up AC in a project vehicle. What are good pressure cutout numbers for r134a? I want to get the right switches so I have cool A/C and more importantly so I don't damage my compressor.
In vehicles typically, you only have a low pressure switch. Typically you want that to cut out around 20 or 21 pounds of pressure. I have never done an air conditioning system in a car but I thought maybe you would order the entire system and then it would come with all of the parts needed? I Never really thought about how the car AC would be done from scratch. Good luck and thank you for watching!
Exclent boos
Thank you!!!! I am glad you like it!!!!
Do you recommend using it as a low ambient control to cycle condenser fan on a residential system? If so, what would you set the cut in and cut out at for 410a system?
On a residential unit you would not need a fan cycling switch because typically people will not use the air conditioning when it is cool out. These controls are usually used on commercial units where they will need cooling even when it is cold outside. Like in a conference room or maybe in a computer room. But residential? No, no need for that. Thank you for your question.
Thanks
Who to know at wich pressure must cut out and in for each frione
A lot of times you are unit will tell you what the low pressure switch in the high-pressure switch should be sad too because the manufacture will have figured that out. A lot of times the low pressure switch will open at 50 psi and it will shut the compressor off what is the pressure gets up to about 100 it should reset. The high-pressure switch could be said somewhere around 600 to 620 psig to open and shut off the compressor, it will reset when the pressure drops to about 420 psig and restart the compressor at that time. I hope this answers your question. Thank you for watching!
Thanks..
We are using R-407C refrigerant in our commercial Air conditioning system. What should be the cut in and cutout for HP & LP pressure Switches sir,?
The pressures of R407C are similar to R22, because of that the pressure settings should be very close to the R 22 refrigerant settings. 407C has slightly higher pressures so high pressure switch should be set to cut out at approximately 450 PSIG, reset is typically manual reset. If you are going to have an automatic reset I would set it to approximately 300PSIG. As for the low pressure I would se the cutout to approximately 30 PSIG and reset or cut in at around 60 PSIG. I hope this helps. And thank you for sending your question.
Do you have any rule of thumb concerning Setting the HP pressure control ? A cooworker told me to set it approx. ( 30 Degree F ) over the usal temperature in the room the compressor is in. And instal a manual reset with it. So the system would only cut out if there was a problem with the condensor fan or with the pressure going up too high.
Thank you for your question. To be honest with you, I do not have a rule of thumb for setting the high-pressure switch. I have been doing this since 1979 and we usually set the high-pressure switch somewhere around 375 to 400 for R-22. And for R-410a typically we would set that to 575 to 600. Some manufacturers suggest that you set the high pressure switch to about 610 psi for the new refrigerant R-410a. High-pressure switch should be manual reset so that when it trips, someone has to go there and see what the problem is. Unless the unit has a holding circuit, or a lockout relay the high-pressure switch should be manual reset. Yes, the high-pressure switch would only trim when the condenser is dirty and there is no airflow across it, or there are plants and weeds growing all around it blocking the airflow, or the condenser fan motor has gone bad, or sometimes the condenser has been installed too close to the wall blocking the airflow, so keep that in mind. It is the lack of airflow that makes the unit have a high head problem and trip the high-pressure switch. sometimes I have seen the units so badly overcharged that the unit goes out on high head on a very hot day. I hope this helps. Thank you for sending the question in.
It's Ambient Temp + 15k Condensing Temp + 10K for a buffer (say if it's a really hot ambient)
It's Ambient Temp + 15k Condensing Temp + 10K for a buffer (say if it's a really hot ambient)
Love you’re videos but man you’re shirts are too tight. Keep up the good work
Ha ha ha! Thanks!!! you made me laugh! I guess they might be. But it is what I have handy at the time. I'm glad he liked videos and thanks for the comment I needed that!
How are you writing so it shows on the screen?
It is magic! That is all I can say! Lol I'm writing on a piece of glass. Kind of neat isn't it?! Thank you for watching!