Refrigerant Low Pressure Control setting

[@sbitschy]

Best explanation of low pressure controls I have seen. In particular, I liked the explanation on how it can help defrost the coil better. Love it.

[@laworder6092]

Fantastic explanation with logical and analytical approach many engineers don’t know how to perform this method thank you sir

[@twaibaalubeidy7780]

Hi there I went and checked my Tev and replaced the orifice it completely blocked and solved the problem thanks again for your help very much appreciated 👍

[@latentfusion2563]

Good job, glad it all worked out.

[@jacksondelahunty3415]

Best explanation on KZbin!

[@5493dev]

Very good explanation. Great video. Only thing I found disturbing your subtitles they are right on the figures you written on the board. But it is Awesome.

[@cruzfernandez4554]

Thanks for taking your time to teach. Really appreciated it.

[@twaibaalubeidy7780]

Thanks for your help I will get it checked straight away thanks again and will update you once I've done it

[@cruzfernandez4554]

Do you have any videos how to adjust a refrigerators, display cases etc

[@ashleyksvondo9012]

Thank you I

[@imranskhosana1210]

Good and clear explanation is it possible you can upload Automatic pump down wiring aswell...thanks

[@tylershipp7082]

Awesome job explaining 👏

[@JaykeSapalaran-iq3qs]

Thank you for sharing your knowledge and experience 🇵🇭🫡

[@jonathankraip202]

excellent explanation

[@monisali1326]

Very nice explanation

[@samierlevy4683]

Hey buddy hope you can assist I want to setup coolroom cut in 5 degrees an cut out 3 degrees in kpa

[@sydneynguyen1461]

Thank you very much,. Please make some more video for us.

[@RobRocker09]

amazing amazing video.

[@mallkomoha6823]

Excellent explanation this what happen in real world. but 1 confusing point people they might think 4 is cut in 2 is cutout from where did he get a -6 since formula says CUTIN-CUTOUT=DIFF why he didn’t subtract 4-2? the you have represented your values on the board are confusing .anyway great job mate.

[@latentfusion2563]

4c is the cut in temperature. To achieve the desired room temperature of 2c we need a cut out temperature of -6c, "saturated evaporator temperature." Hope this helps.

[@sheiksatham2195]

Thank you brother...keep doing..

[@luisedward3336]

Awesome stuff mate!👍

[@bhaisahab8118]

Sir I want to know about YORK Chiller Model YVAA / YCIV about programming all pass word , How to operate controling device's in the unit stop position ? Thank you

[@twaibaalubeidy7780]

Hi there I have just replaced a Lp/Hp switch a danfoss one on a walk in freezer which is on 404a operating at -18 to -20 and I set it up exactly the way you explained in the above video the compressor kept on shot cycling can you please shade some light on what is wrong note I've ruled out all other causes because when I bypass the Lp/Hp switch the unit runs till the at -18 mind you the ambient temp outside was about 13 degrees Celsius

[@latentfusion2563]

What is the running suction pressure of the system when the freezer is nearly down to temperature?

[@twaibaalubeidy7780]

Hi there thanks for your response well the suction pressure is half a bar it seems I have a bloked TEV is that not the case?

[@f1reguy587]

Just on the pressure temperature, there’s also gauge and bubble, so 4 degrees is 100 psi gauge, these things are what confuse me about knowing where and when to apply for accuracy.

[@latentfusion2563]

It's ok lots to learn when it comes to refrigeration, that's what makes it interesting. Blended refrigerants, R400 series, have what is known as glide while changing from a vapor to a liquid during the condensing process. This glide is not a factor when setting a low pressure control due to fact that we are dealing with the evaporator. A condenser operating with glide refrigerants, there are three temperatures of special interest: the dew point (the highest condensing temperature), the mean condensing temperature and the bubble point (lowest condensing temperature), which is achieved just before all refrigerant has been transformed to liquid. Hope this helps

[@pedrojardim1163]

thanks for the help

[@jacksondelahunty3415]

How do you know to cut out at -6? Is this a standard temp on that sortve set up?

[@latentfusion2563]

Yes -6c is the standard saturated evaporator temperature cutout for most chillers and walk in cool rooms. Gravity coil display cases run colder though. Not to be confused with the actual room temperature. The evaporator needs to produce a temperature colder than what it is intended to cool. Law of thermal dynamics, "hot goes to cold." So by having a cold evaporator we can get the heat energy to flow from the product or room being chilled to the cold evaporator. Hope this helps

[@fazeelarshad5339]

Hi dea boss awsum video. I have a cool room with r22 refrigerant 3°-6° so how do u set the LP pressure controls.

[@latentfusion2563]

For a cool room operating between 3-6C I would set the cut in at 73 psi and the differential to 27 psi. This should give you a cut in 73 psi and cut out 46 psi, a -5C evaporating temp and a cut in at 6C.

[@xraybravo7180]

We never got anymore videos from you I wonder what happened?

[@othusitserapoo]

hi thanks for the video. I have a 2.4m display fridge for meat using a R134a compressor system. what would be the settings for the low pressure control unit using a Differential and a Range controllers?

[@latentfusion2563]

hi, thanks for your question. I have a couple for you. 1. is the meat packaged or unpackaged? 2. open or closed display? 3. gravity coil, forced fan operation or an old school cooling slab? let me know and I will do my best. cheers

[@juvaeljadman2296]

Sir. What's the setting of -35 and -10 ? Thank you for your help

[@Gunshow0]

Is this applicable with the Ranco LP controllers with differential on the left and cut out on the right? The numbers are for diff is between 50-400 and cut out is 0-700

[@latentfusion2563]

Works with any and all low pressure controls.

[@Gunshow0]

latent fusion cool thanks mate, I haven’t had too much to do with them and had to set one up yesterday on a medium temp 2x solenoid system running two cases - still unsure what I’m doing but this kinda helped! Thanks again

[@vinniebullard4643]

It would be nice if it was in Fahrenheit lol but I get it

[@ronnnyjohal]

👍👍

[@twaibaalubeidy7780]

What I intend to do is to pump the system down then open up the TEV flush the entire suction line with ofn including the TEV vac the system up and re-charge it will this solve my problem?

[@f1reguy587]

…what problem? If it’s not operating correctly, cleaning it inside won’t do much, set your pressures, take actual temperatures, but if you pump it down, fit a drier/sight glass. Which does remove bits of doubt in the system… you need to know that all of it is functioning as intended and if the system has the right amount of refrigerant.

[@mikeautostudent5562]

Thanks for your video, how you adjust for safety or at what temp ranges?

[@latentfusion2563]

Hi Mike, the -6c is for the average medium temp cutout operation, if a refrigeration unit is using a low pressure control as a main operating control. Thermal dynamics states hot will go to cold, so in the operation of a cool room the thermostat is set to cycle between 2c + 4c for food safety. The evaporator coil will need to be colder than the room in order to make a heat transfer possible. Most Evaporators are engineered with a set temperature difference at a certain watts or Btu's. Normal TD is 6K or around 8 to 10 F. What this means is that when your cool room temperature approaches 2C, your saturated temperature of the refrigerant will be in the minuses. The off coil temp of the evaporator will be -5 or -6C and the room will be at 2C. Keep in mind the evaporator will be selected for the rooms heat load but they condensing unit may be of a larger capacity than your evaporator coil. What this does is lower the off coil temperature and increase the duty. This means it will pull the room down faster. The problem with using a pressure control on a system like this is finding where to set the cutout at. This is why I have recommended using -6C as a starting point and adjusting it up or down as required. The "cut in" will always be at 4C but the "cut out" may very slightly depending on system design. Systems like gravity coils will have very low 'cut outs' due to the lack of fans, All depends on what your controlling.

[@mikeautostudent5562]

@@latentfusion2563 thanks for detailed response.

[@geomenachery4315]

It works with dual systems with one outdoor unit.

[@latentfusion2563]

Yes, as long as the suction lines are the same length to the indoor evaporators from the tee junction. Different lengths of suction line can add more pressure drop on the greater side.

[@geomenachery4315]

I set the pressure switch as u was said it before. But the compressor is tripped. Its 404a deep ഫ്രീസർ -18'c The suction pressure is 10 psi. After that i keep the diifferencial is10psi now it is working. As per u r suggession 32 psi - 15 psi the differantial will be 17 psi. It is 2 systems. The temperature is also different. Some times one solenoid vave open. So there is pressure difference. If one solenoid will open the suction is 20psi. If the both are open pressure is 10 psi.

[@santoshnaik9175]

404a gas we need -18 cut out pz tell settings

[@prithwishdey6708]

Sir please one video make on freezer compressor winding cannection.

[@f1reguy587]

It comes down to how the freezer is wired up and the wiring within the pressure switch, if there’s a solenoid, relays and if you want alarms, best bet would be to provide the youtuber with the condenser unit schematic, and types of controls in place to set, and see if he would do it in a similar way, or if there’s alternatives…

[@prettycureforever7102]

Looking for something like this

[@johnnyaraujo3513]

Appreciate it

[@TheBijuf43]

Can you explain pressureswitch setting for R22 refrigerant on freezer & chiller

[@latentfusion2563]

Same procedure as in the video for R404a but different numbers. For R22 cut in at -18C / 24 PSI DIFF Setting of 13 PSI, this will give you a cutout of -28C and a holding temperature of -22C. Hope this helps

[@TheBijuf43]

@@latentfusion2563 thanks for support Can i get R404 refrigerant suction pressure in blast chiller

[@latentfusion2563]

@@TheBijuf43 blast chillers work on the same principles as regular chillers except they are designed to do it quickly. This is why the condensing unit is so large and the evaporator has many powerful fans. We are still governed by the fact that we want to cool the food and not freeze it. Most blast chillers are controlled by means of a temp probe that can be directly inserted into the product being cooled. A pressure control would only be used as a safety device on this type of equipment. All the best.

[@twaibaalubeidy7780]

Or what's the best approach you think I should take

[@latentfusion2563]

Sounds like a Txv issue. Possibly a blocked orifice or a leaking power element on the valve itself. I would check those first.

[@geraldmanzanaresjr2561]

Next video forget this Celsius crap lol

[@latentfusion2563]

Fair enough!👍

[@srobeck77]

Celsius is superior to 'F for a few reasons. But were in 'Merica, so 'F is what were stuck with as the standard.

[@shivamazad1608]

Nice

[@vinzpntech8058]

good eve sir, if the low pressure goes to zero what are the problem?

[@latentfusion2563]

You can pump a system down to zero psi but you never want your system to run for extended periods of time in a vacuum. The compressor can become damaged and or overheat.

[@srobeck77]

I still didnt follow how the gray area of Cut-Out temperature was determined.

[@latentfusion2563]

Well the gray area is determined when the equipment is selected. Not all suppliers print the info in their catalogues but check your supplier catalog. In the section of evaporators, find a blower coil for a cool room. The details of the coil should be on the page, size, connections and capacity. Above the capacity it should state the evaporator T.D. Example: Btu/hr (10f TD) or (15f TD) this is the temperature difference between the coil surface and the room you are cooling. The TD should not be mistaken for the operating temperature of the coil. When dealing with C we refer to it as( K) TD for Kelvin. Hope the helps

[@latentfusion2563]

Easier example, 2c is 35.6f room cutout temp. 15f TD would correspond to an evaporator temp of 21.6f or -6c.