How to pressure test the A/C unit. Part 1 

Oh man finally this is the cleanest explanation of pressure the system on entire youtube thank you sir.

Really good tutorial on pressure testing of a system. Take care, Brett

Thanks for the concepts you have shared here.

Great demonstration on pressure testing!!

I am demonstrating using the highest pressure you could use on all types of equipment. some of the older units could not safely go above 150#. If the plate says 300 hi side and 150 lo side, 150 is the highest pressure without being able to separate the parts. GFM

Thanks for your help.

Thank you for posting this video GFM!

Thank you for the video!

Thanks a lot for video!

Thanks for posting, very informative

Awesome video

Good job! I like.

Thanks GFM

very nice job thank's gray furnace keep up the gooood video's!!!!!!!

thanks for sharing...

good video thanks

great tutorial. So if i am using analog gauges i just need high side?

I followed you right up to the end of the purging of the hoses to the input of the unit and this is where I've always parted company with some of you guys demonstrating this procedure. Correct me if I'm wrong, I don't want to be the contrarian here, but the way I see it, you're simply applying a pressurized column of Nitrogen to the input of the unit and compressing the air within, because the opposite side of the system (low or high depending on which way the flow is) is closed, UNLESS, you purge the system and lines by applying pressure (as you are doing) and then loosening the opposite attached hose to purge, OR, you first pull a vacuum and then introduce the nitrogen.

Your welcome GFM

Unless the high and low side are isolated by valves or by cutting out a component and brazing a line tap, do not exceed rated low side pressure. Coils can be pressurized higher when isolated, but you are taking a chance of blowing a hole in the piping. GFM

how can I track specified outdoor unit for indoor unit can you help me.

if you are pressure testing with nitrogen do you really need to bleed the lines, because when your done testing you are going to release the charge

This one is CO2 You can get them at welding supply. You will also need a regulator. You can also use nitrogen. The regulator will go higher. Hope this helps. GFM

Thanks for a great video very very useful and informative. in the beginning you say pressurizing using nitrogen or co2.i understand nitrogen but, wont you be introducing the system to moisture with co2? isn't that bad? Thank You.

Great video ! Just wondering why you you only put 150 psi if the maximum is 700 ?

brilliant

I have a question relating to the installation of a 2.5 ton R-410 split a/c system that comes with a precharged condenser....how does one purge for brazing or pressure test the interconnecting tubing with nitrogen when there are no service ports on the evaporator?

Hi Thanks for the video..I have a leak in a heat pumps system with TXV in both . I'm going to isolate the units. Do i need to pressurize both high and low sides of the line sets or just one side? Thanks in Advance

Quick question - after brazing in new R-410A (150foot 1 1/8 line set on a 4 ton unit) the system was pressurized to 350 psi with nitro to leak check the connections. System pressure fell to 340 PSI after 30 min and to 300 PSI after 5 hours) is this a problem with a leak some where?

Thanks very much sir for your good work. Also sir given that we now have nitrogen in the unit, how are we going to get it out before our refrigerant recharge? Thanks

No. That was the amount of superheat that you would have if the pressure was .1#. The temp was I believe in the 70s. I am not into torture anymore. GFM

Thanks for the video. I need to pressure test a r22 260tr chiller evaporator shell, the tubes hv refrigerant In them. How much should be the nitrogen test pressure be for the same?? The design working pressure for tubes is 235psi and shell is 150psi.

Is it possible to presurrize two units at the same time using one set of gauges on a 410a system?

what sizes will i need to connect to the gauge set?

on a R-410a system, will nitrogen be good with the refrigerant oil when you do the leak test passing tthru the compressor?

How long do you leave the unit pressurized when doing a leak search?

Hey furnaceman, kind of an off topic, but i ask because i notice the same guage in most of your videos...Do you have separate guages for your 410a and your R22 installations?

How many ounce of r22 do you put in unit if you do have a leak, to be able to use leak detector?

Why did you say bleed the low side? I thought you said not to hook up the low side. I'm using analog gauges.

Very good video. I have a question that I am having trouble finding an answer to. The question is how many ounces of liquid refrigerant will a standard 1/4" refrigerant hose hold per foot? And is there much variance between refrigerants? I have search online to no avail. Thanks.

After you finish the leak test...do you recover the nitrogen with a recovery machine or what..?

Manifold gauges are a thing of the past.

How much price in this digital gug meter

cut the bottle off and use the pressure gauge on the bottle to see if your loosing pressure ,,you don't need the gauges,,jut don't loosen the hoses

Never ever put 700 Psig on any hvac system. The compressors aren’t meant for any more than 150 psig.

Was it really 105 F when you made this video? If so thanks for torturing yourself for us.

To add to my other comment, a compressor can only take so much pressure before it will be dangerous and could potentially explode and could kill someone. So he says it could go to 700psi, no system works at that pressure. It’s not made to at all, not even close to that. So at about 420-450psi, the compressor could start to expand/change shape due to high pressures therefore damaging the compressor. Above 450psi, this will be when the compressor could be explosive. Please please please take my advice and only pressure test at 150PSI MAX!!

Never got to the point!

Thanks GFM