HVAC Manifold Gauges and P/T Chart

[@knuckle47]

Dr. Z I am not a tech, in fact I am a guitar builder. My Fedders A/C is 30 yrs old and has developed a freon leak near the evaporator connection fitting in the attic. Your videos are terrific and I applaud your honesty in showing how to accomplish these tasks. I know my unit needs replacement. However, once I repair the leak and charged it...it has been working great here in NJ..Thank you for your extreme contribution.

[@mygripe]

I just want to say Im able to pay much more attention to your videos at work than I'am at my trade school..peace and quiet + your videos will get me through just fine :-)

[@Bearfly]

DrZarkloff, I wish I had you during a discussion last night! I have never had people be so rude about ideas when it comes to ambient temperatures, superheat and trying to explain to them what all this means when it comes to these new Freon Gases along with their increased pressures such as R-410A and R-404a etc. Thanks, Seabreeze

[@DrZarkloff]

Thanks for watching my videos. I do like the Uniweld gauges just as much as I do the other brands that you mentioned.

[@locutz]

thank you dr z for making this so clear to me now,and funny just today at work my supervisor was asking me if i knew how to work out super heat and sub cooling,now i really know how to do it now and how to check the gauges properly i was so confused with the new readings on the gauges thanks again

[@ristin59]

Great video, DocZ! I'm going to show some of these videos to the young guys. Most of them had worked just as gang installers. Most haven't been to school yet. This will help them out. Thanks!

[@MrFivi]

Thank you for sharing your knowledge DrZarkloff. I enjoy your videos and I always look forward to the next one. Please keep up the good work! :)

[@classic-hb8vs]

Thank you for your help. All your videos have helped me learn a lot. Can't thank you enough

[@FreaK42WheelZ]

I didnt realize there was a digital PT chart. They help SO much.

[@DrZarkloff]

@Alxscode The standard evaporator temp for high temperature applications is 40 degrees F.

[@DrZarkloff]

Yes, R-134a is the most used refrigerant for domestic refrigerators. The new refrigerant for walk-in freezers is R404a and the newer walk-in coolers use R-134a.

[@newstart49]

Important to know that superheat charging is done with a fixed metering device as in a "piston" or "cap tube" coil and subcooling used for TX valve coils. It is good to check both superheat and subcooling in both types to see if there is a problem . The system needs to have been running at least 10 minutes to stabilize before an accurate reading can be done.

[@Aussie50]

fascinating stuff man!, my uncle (HVAC tec) and I went over similar stuff when giving my workshop system a checkup, 64PSI low side, bout 6.7*c coming off the Evap coil. can't remember what subcool was but it was good.

[@DrZarkloff]

The HVAC Guide does all the calculating for you, including the target superheat and subcooling. Fieldpiece does have a target superheat chart that you can download in .pdf format.

[@wiserdaley6624]

You're a very kool and detailed instructor. I subscribed, like and click notification with ease.

[@DrZarkloff]

If it the system has a TXV, you'll want to charge the system by subcooling instead of superheat. Look at the back side of the control cover in the condensing unit. There might be a chart that tells you what the superheat or subcooling should be for outdoor ambient.

[@hidalgojuarez]

Exelent vid Mr, thanks to u now I know how to get the superheat but I have two question for u, when u already get your superheat, what is the place for it,?where does this temp correspond?an the other question is, it is the same way to get the subcooling temp?the same process,?thanks againg and God bless you.

[@keithshreve6736]

Excellent Video and information, Very well done. Thank You!

[@V8Jagnut]

good vid. you have a very nice gauge set. i have never seen a gauge set in 'F.

[@petermendonca807]

Thk u sir for this good information about reading of the gauge

[@britneyjohnson2348]

So if not already said, if you have gauges that have only R-410A markings they will work for other refrigerates as well. You just need the paper chart to convert pressure on the outer ring. If you do use gauge on unlike systems, you should blow out the gauges and hoses with nitrogen between use to avoid contaminating systems.

[@jimbola77]

very well explained DR Z thanx for the vids!!!!

[@DrZarkloff]

Cool! I'm glad that this was a good refresher for you.

[@DrZarkloff]

@doughgetta2 Typically, if you have a low super heat or subcooling it means that you have an over charge.

[@dac122yt]

Thanks Dr. Z, I'm learning as I go, and that filled in many blanks for me. I've read that superheat too high means not enough refrigerant flowing to evap, and too low means risk of liquid going to compressor, but what is "too high" or "too low"? In other words how do we know if we have the right superheat for a system?

[@DrZarkloff]

Thanks for the answer. I couldn't have said it better myself.

[@jimbola77]

very nicely explained dr z your videos r great! any more funny videos with the wife?

[@MrGreenzboy]

Good video. Is there a chart for putting refrigerant in pounds

[@hobie0001]

Can you explain how to charge a commercial freezer (captube) using the superheat/subcooling method?

[@DrZarkloff]

@dossen2620 You'll need a P/T chart especially when you're using refrigerants that aren't listed on the gauges.

[@DrZarkloff]

You should really check your pressures while in the cooling mode. With that, use superheat or subcooling to charge the system.

[@petermendonca807]

Would like to know more knowledge from you sir on ref n air-condition services

[@Cookitup706]

Thanks Dr Z. that was great.

[@DWAYNE2ism]

good video much better understanding on P/t chart

[@DrZarkloff]

I'll get to it when I can. Thanks for the interest.

[@tomwarda2697]

Have you ever used Cold Plus as a cooling enhancer? I have heard stories of saving 8% to 18% on both commercial and residential systems?

[@archeryman5000]

@dossen2620 You need more than just pressure, you also need line temp to frigure out the subcooling and super heat. You then use the subcooling and/or superheat levels to helpt determine whats going on with the system. There are many things that low superheat or high/low subcooling could be, thats why techs get training.

[@DrZarkloff]

@castleman7300fx It is best to take the suction line temperature nearest to the air handler.

[@DrZarkloff]

Yes you can. I have a different compound gauge than originally came with the manifold.

[@DrZarkloff]

@HCVguy93 As far as inexpensive manifold gauges go, I like Yellow Jacket and Uniweld.

[@dangledfrosty4236]

@ibrhin al-hkalia is used to control superheat

[@DrZarkloff]

You could try getting a job at a hospital, apartment complex, nursing home or any other place that does their HVAC in house.

[@castleman7300fx]

Hi, Could you tell me where you take temp from suction line ? I guess it is near evaporator end..... Thanks...Great vids btw.

[@Wallabydam]

Today i could only check the suction on the low side of my Trane XE1000, it read on the gauge, 70 psig on the gauge, its R22 unit, SO by checking temps on the high and low side lines can that tell me if i need to add more freon if need be? some reason i thought it worked like if it was 70degrees outside, and you look at the gauge it should be that PSIG, lol, damn im tryin here!

[@dutchman12789]

the lowside guage is dor the evaporator coil n the high side guage is for the condensor? im still trying to figure how to use the guages i only work on installations so we dont really use guages except for leak checks n vaccums

[@DrZarkloff]

@Wallabydam You'd have an overcharge on the system if you used that method. You really should have they system charged in by subcooling.

[@DrZarkloff]

Thanks. You might want to check out my video entitled, HVAC Subcooling with the Fieldpiece HVAC Guide. I think that might answer your question.

[@ibrhimalkhalia9612]

THANK YOU HOW TO ADJUST EXPANSION VALVE DEPENDING ON SUPER HEAT? AND SUBCOOLING

[@DrZarkloff]

@letsplay59 You really should clear the manifold and hoses with nirtrogen before switching back and forth.

[@greygoosemafia]

I have an imperial set up for different r. im looking for a 134a guages.

[@myhealthtoo]

So with my r22 York 2-3 ton house unit the low side should be at 70 psig and 40 degree?

[@mrmenta]

can you interchange gauges with different brands like imperial manafold with a yellow jacket compound gauga a nd hi side gauge?

[@carll1tosm]

hello Dr. Z, I have a question. How I can determine what is the right superheat for each unit. My teacher told me to find in the internet by model number of the brand unit but i cant find any answer. i will appreciate your answer thanks

[@DrZarkloff]

@jimbola77 Thanks for watching.

[@joshuawhite3497]

What is a target subcooling & superheat.

[@postholedigger8726]

If your gauge does not have a 134a scale can you use another scale using the cross reference numbers from the PT chart? In other words do you need to purchase another set of gauges for a different refrigerant?

[@zeke112964]

+Vivienne Pierce No you just get a chart and convert the pressure to the temperature off the chart

[@leonchaudhury7486]

Thank You Sir! 👍🏽

[@tyl8ter]

Question?...........I am still learning........but, had higher ambient outside temperature....84 degrees...........with highside ( sman wireless) @ 209 psi ( 71.8) and sub @ 64.7........inside temp diff --18 degrees split.............why is my ambient higher than my highside ?......Thank you

[@DrZarkloff]

I know what you mean. The school board is just now replacing older R-22 systems with R-410a systems.

[@billyjon3746]

how do know if I have 9lbs or 12lbs or how do I know if a system is over charged or under? with refrigerant on r22 410

[@wahabhakimi7178]

in a big Ice cream Mashine in which number should keep it?

[@thesmoothjazzguy2012]

I just bought a Zeppelin manifold, that is for 410A, 22, and 404A, and i'm wondering if you think they are any good?

[@DrZarkloff]

@luthier47 Thanks for watching.

[@rodney2771]

What is the proper super heat range , have an app from jonhstone and its telling me 32 should be my super heat for a 3 ton unit

[@TommyStump]

Can you tell me what is the ideal psig for a 410a 2 ton strg cool system @ a outside temp of 85 to 95 degrees???? Thanks Tommy

[@dossen2620]

I think I am making this harder than what it is. I do not understand how to check the refrigerant. I hook up my gauges and Im reading 50psig on low and 200psig on high side. I dont understand why the chart is even needed, if im showing 50psig then the temp is 26(r22) the gauge tells me that so why do i need a chart to tell me the same thing. I have a 2.5ton trane unit. I just can not grasp on how to do this

[@MrJosebolivar]

please can you explein the , when you measure amp por compresor

[@LubaLuba1]

Great news I got it running again but a few concerns 1 when the thermostat turns off after reaching temp the outside unit still stays on is this normal? and its blowing good but not very hot when it started it was hot temp outside is 74 degrees and dry.

[@DrZarkloff]

It is not normal for the outside unit to continue running once the thermostat satisfies. You have either a stuck compressor contactor or the thermostat wiring has a problem.

[@LubaLuba1]

the wiring for thermostat hasn't change so must be contactor connector its very old

[@keyroncampbell]

+Danny Diet just take a pic of the wiring and change it out.

[@DrZarkloff]

Thanks for showing my videos.

[@jimbola77]

very dr z how do u like those analog manifolds by uniweld???

[@DrZarkloff]

+jimbola77 They're okay. Just keep them calibrated.

[@edwardcrane7520]

Hey buddy can you do one for r123. I have trane centravac with adapt view controls. unit will tell you negative 8.8 psig how do you convert that to hg.

[@zeke112964]

+Edward Crane Below zero is a vacuum and your reading in inches of Hg and 8.9" of Hg is 65° F for R123

[@DrZarkloff]

Thanks for watching.

[@jasoncoolguy]

manfacturer superheat spec should be use or universal superheat refrigeration should have 10 degree of supeheat ac 15 degree

[@LK-pc4sq]

how do you KNOW what refrigerant type is in the AC system?

[@scarface7142]

L K it would tell you on the unit

[@vemlacduong1954]

Thanks . God bless you .

[@geraldlucidos8356]

How could you identify what kind of gas in the system using the gauge manifold?

[@qazisadso]

you cant, they type of refrigerant the system has will be on the unit. look for the plate and it will have all the info you need.

[@keyroncampbell]

or if the pressures high, you know it has to be 410A because pressures higher.

[@Egarcia1972]

Thanks 4 d video ,very helpfull!!

[@davepenprase]

whats the bird for? are you using so2 ?

[@carlfxy]

Thanks a useful explanation

[@LubaLuba1]

How to check what gauges should be for R22 ?

[@kcocgibkcusuoy]

That's the green band on the gauge and chart in the video.

[@brickw8599]

You dont explain what the temp is. Is that outside temp, or the temp that the system will produce at that given pressure?

[@zeke112964]

+steven yau What do you mean they're not very accurate? Where are you suppose to read them?

[@jimmyfuckinmusic]

Thanks Dr Z.

[@DrZarkloff]

@Bearfly Sounds like a pretty hot topic.

[@shelby50411]

I think my temp is in celsius ..mine says 5degrees at 65psi

[@lex6794]

Thank you Sir!

[@P8uyan]

Thank You HVACS.CA

[@realstonekicker4371]

Good information but bad camera skills. Hold it steady or take a tranquilzer

[@DrZarkloff]

Yes.

[@DrZarkloff]

It's the old beer can cold method.

[@DrZarkloff]

Thanks

[@DrZarkloff]

Thanks you

[@LubaLuba1]

no no i need the charaging measurement amount ? i have 3ton 11/or 13 york

[@imranjani3005]

Luba Luba hy dyr?

[@DrZarkloff]

yup

[@VicHimself]

My guage heads are broke.... :(

[@CS_247]

dude, good description to teach basic understanding of pressure/temp relationship and chart/gauge use, but the math!! Seriously!!?? A/C should be left to professionals, not pre-schoolers!

[@5822huron]

Anton Spilhaus You don't have to be a ticket scientist

[@scootin123]

Anton Spilhaus yea most of us made it through the third grade math but you are through in your explanation and the camera shake doesn't bother me considering the good info you provided. A thumbs up good video .

[@Adlsupply]

hvac supplies are avaible at a low price guarantied

[@DrZarkloff]

It's funny how that works out.

[@Malakaijaxandsuhaylkamali]

DR z can you check dax flame the young kid

[@DrZarkloff]

@vichimself69 I hate it when that happens.

[@scrappydogfinance8434]

Why are the dangers of working on HVAC?