HVAC Manifold gauges 2

[techbiz05]

When you bleed air out of the hoses, you are just opening the low and high side valves. I am assuming that they are done in that order and not simultaneously. Also, when you open the valve, the refrigerant flows into the middle chamber to which the yellow hose is connected. How does this air gets released out of the yellow hose?

[DrZarkloff]

@techbiz05 You can back flow the gas by loosening the yellow hose connection on the manifold.after you have the other end of the yellow hose connected to a drum of refrigerant and have the drum valve open.

[84randomdude]

I noticed that when you removed the gauges from the unit, there was still pressure in your hoses, the gauges didn't read zero. Can you explain how to remove the pressure from the hoses after taking them off the unit? My hoses also do have low-loss fittings on both the low and high side.

[yrtuag]

Maybe your viewers could use a video on how to calibrate their compound gauges.

[DrZarkloff]

@yrtuag I have a video already where I calibrate my gauges. Please Check out Manifold Gauges.

[jimbola77]

excellent video!!!!!!! DR Z YOUR THE MANNNN!!!!

[9095100081]

DR Z. MY GAUGES DONT HAVE LOW LOSS FITTINGS. WHAT YELLOW JACKET FITTING DID U GET?? YELLOW JACKET PART#? HAVE ANY IDEA? I WANT TO BUY THE FITTING U HAVE IN THIS VIDEO

[DrZarkloff]

@9095100081 You should be able to buy them at any HVAC parts house.

[HandyManAndyCan]

My High-side of the refrigeration gauges is not working, it stays on 0. My gauges are only 2 months old. Do I do something wrong? What would check before buying new gauges?

[DrZarkloff]

@HandyManAndyCan You could just replace the high side gauge. I like the liquid filled.

[YourePrettyGoood]

thanks for the video. I am wondering how do I know which is the low and which is the high? Low will be cold while running?

[DrZarkloff]

@YourePrettyGoood The low side is the larger tubing and the high side is the smaller tubing.

[krob08]

is this cross bleeding

[DrZarkloff]

@krob08 I don't know the tech name for it.

[zamorahvac]

what series number are those yellow jacket gauges?

[DrZarkloff]

@zamorahvac Actually, it was a Uniweld, Man, What A Manifold.

[blissJesus1]

Dr. Z, I tried my new set of 410-A gauges; which. coincidentaly, had low- loss fittings connected to a standard fitting. The condencer was set, the vacuum was pulled, and the refrigerant released. When it was time to remove the gauge hoses, I had forgotten to remove the low-loss portion of the fitting; and instead, unscrewed the standard fitting; and, you are righ: I was not happy.

[DrZarkloff]

@blissJesus1 I hate it when that happens. Life is the best teacher.

[cwycyeah]

thank you : )

[cwycyeah]

doctor, what is back seating a valve (backseated valve), and what is back pressure?

[DrZarkloff]

@cwycyeah A king valve is more like a three way valve. It closes off one side of the system when it's back seated then it closes off the other side when it's front seated.

[cwycyeah]

Dr, what is a backseating, and backpressure?

[myhero70]

Once the pressure stabilized, I just cut the system off to drop my pressure on the high side. Is it wrong to do this.

[DrZarkloff]

@myhero70 I find it better to draw the gas from the liquid side to the suction side before disconnecting the hoses.

[woody3307]

Dr. Z,

Hired HVAC gus to install a mini split heat pump Mr. Slim. It looks like they did not back the stop valves out all the way to back seat and there was slight leakage at the valves. The caps may not have been tight enough to hold it back, but they are probably not designed to do that. Anyway, I only have 1 service port? How do I hook gauge to check the 410A level to see if still have a slow leak? Will I lose too much 410 by checking?

[DrZarkloff]

@woody3307 If you suspect that you've lost refrigerant due to a leak, you need to recover all of the gas from the system then weigh in the proper charge according to the specs. Just putting the gauges on a mini split isn't going to tell you much unless the system is flat.

[HCVguy93]

Where can you buy these low loss fittings?

[DrZarkloff]

@HCVguy93 You can buy them at any HVAC supply house.

[HCVguy93]

@DrZarkloff OK. Thanks. 

[DrZarkloff]

@plaebslayer I feel for you bro

[mahayes866]

Dr Z why didn't your gauges return to 0psig? I'm assuming it's because they are still under pressure? Will the pressure go back to 0 over time? Thanks.

[DrZarkloff]

@mahayes866 The low loss fittings hold the refrigerant from leaving the hoses.

[sromanecz]

i dont really understand this too much... i take mine off the way you take yours off but putting on the suction hose first would suck in any air in the hose from the lo-loss fitting to the manifold... shouldnt the high side be connected first and then bleed the hoses?

[DrZarkloff]

@sromanecz I don't really have any special order of connection. I sometimes connect the high pressure hose, especially if I suspect a problem there.

[sycabal]

My teacher taught me a funny way of remembering which one is the suction line. Just remember "she sucks the big one" since the suction line diameter is larger than the liquid line.

[DrZarkloff]

@sycabal lol

[jsemelgar]

When you bled the air out of the hoses, that is you opened the high & lo gauges just a bit and closed them... where did the air in the line go? It looks to me like you introduced ambient air into the a/c system. Could you explain please? Thank you.

[DrZarkloff]

@jsemelgar I purged the air from my manifold gauges. Ambient air wasn't let into the system.

[JimmyDear]

Dr Z. I must admit my long time crush on you! You are one handsome piece of meat. You sure know how to raise a mans Superheat!! Kisses X0X0X0

[Woden5599]

Mr z I got 2 questions.. One of my instructors who is still in the feild told me that we could get our gauges that are oil filled to avoid the needles from moving from vibration would that be helpful ??? 2nd I have 2 no loos fitting given to me from school which I'm still in and if I put mine on the low Side/suction my gauge dosent read pressure is it my fitting ????

[DrZarkloff]

@Woden5599 I like my liquid filled gauges that I use at work.

[grlg2]

Hi DrZarkloff, Thanks for all the fantastic videos. I have a question regarding oil return on a mini-split air conditioner (called "split system" in Australia). From what I've read in textbooks all pipework must slope downward (at a particular angle) to ensure that oil is pushed back along the the low side pipe to ensure good compressor lubrication. I've asked a few installer over here and they don't seem to worry too much about it. Just like to hear your thoughts on the subject. Thanks. Greg.

[DrZarkloff]

@grlg2 Any time the compressor is located higher than the air handler you need an oil trap to be located at the air handler.

[co2x3]

Hi DocZ excellent clip. your touching on trade secrets. the high side purge is exacltly

what ive been doing. really helps on keeping the oz in the system.

[falconninja1211]

your awesome thanks

[DrZarkloff]

@falconninja1211 Thanks

[acechoice45]

As Alway Good Video Me and my Brother are Black HVAC Techs from Philly and We learn Alot From Your Videos

[DrZarkloff]

@acechoice45 Thanks for watching.

[Nutintoitbut2doit]

I use the low loss hoses and they are great, only thing is because they are spring loaded they do bend the valve stem from time to time and you need to check to make sure there not leaking before you put the caps back on.

[DrZarkloff]

@Nutintoitbut2doit Thanks for mentioning this.

[aalderman22]

What's funny is I was reading 40 then found that high side leak then went to change my filter and it was a reuseable filter that got sucked into my return duct. All I could do was laugh.

[DrZarkloff]

@achzdck Thanks for watching.

[aalderman22]

Nice lil trick at the end Z. Finally got a hold of some free 22 so maybe i cant get my pressure back up to 75 instead of 40, lol!!!!!

[DrZarkloff]

@aalderman22 Cool.

[ed110205]

Thats R22 right? i was lookin at gauges..im 19 n im trying to learn this real good im tired of doing pm jobs

[DrZarkloff]

@ed110205 Yes, it's R22.

[falconninja1211]

Dr.zarkloff, thank you so much for responding to my request.your very kind to make this video to fit with your busy schedule, especially the holidays.question i have, what do you do if for instance low side manifold hose got hooked up to high side on unit and vice versa? also, is purged done each time? great video and God bless and take care. John (Portland, OR.)

[DrZarkloff]

@falconninja1211 You need to purge each time unless you already have gas in the manifold.

[explodingninja1]

hi uncle

[DrZarkloff]

@explodingninja1 Hello, Josh.

[legacy0367]

Great Video Dr Z. Thanks

[DrZarkloff]

@legacy0367 Thanks for watching.

[jesusmariomeda]

excelente i was wonder how to do it and then you come up whit these video thanks

[DrZarkloff]

@jesusmariomeda Thanks. Just in time.

[jesusmariomeda]

@jesusmariomeda i have question i instale on the air conditioning i contactor 24 volt contactor c240a doble two pole 40 amp then i notice on the breaker panel it 30 amp it ok or i have to replacer for 30 amp i aprecciater if you let me know thank the ac it 2.5 0r 3 ton

[V8Jagnut]

that was a good vid to watch while eating dinner.

[DrZarkloff]

@V8Jagnut Thanks. :)

[81minuten]

you have bent a lot of fins on your col with the hook on your gages

[DrZarkloff]

@81minuten I know. I can be a slob with my own machine. :)

[fixinggrace]

Very good points with the gauges. This knowledge is priceless as I'm starting a new job Tuesday and want to be sharp.

[DrZarkloff]

@fixinggrace Congrats on your new job.

[fixinggrace]

@DrZarkloff started today and got 4 out of 4 running today. Life is good.

[mechanicwarrior20]

great job :D

[DrZarkloff]

@mechanicwarrior20 Thanks.

[chevychemo]

Do a video about how to restore used gauges (since many ppl buy used ones at pawn shops to do some work themselves) by replacing gaskets, calibrating guages, and replacing knobs. Dr.Z i love your videos because they r (mostly) unedited which gives a better learning experience! GOOD JOB! If u have a P.O. Box # id like to send u a great set of gauges (ill email u pics

[DrZarkloff]

@chevychemo I have one up already where I show how to replace gauges on nitrogen regulators.

[chevychemo]

@ilovedisney

The yellow hose is for charging, recovering and evacuating a unit.

[ilovedisney35]

@chevychemo  first thanks for your answer second ilovedisney35 is my user name not ilovedisney but dont worry thats no biggie

[socaldt]

awesome. what do you do with the remaining refrigerant/pressure in the manifold gauges?

[DrZarkloff]

@socaldt I leave it in there. It usually tends to leak out unless I used it within a week or so.

[bubba007ss]

Great Job HVAC MAN

[DrZarkloff]

@bubba007ss Thanks.

[bwd111]

Great Video! I just bought a testo 550. Can you do a video on how to wire a lps and a hps on a aircooled condensor.

[DrZarkloff]

@bwd111 Okay.

[ilovedisney35]

whats the yellow hose for again

[DrZarkloff]

@ilovedisney35 chevychemo explained it well.