R-22, R-410A Refrigerants! Checking the Charge- How to tell if there is a Restriction or Bad TXV!

[@acservicetechchannel]

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[@acservicetechchannel]

Hang in there!If after you check the filter, airflow, have a clean evap coil and you have the proper subcooling then you need to start looking at the txv bulb. It doesn't happen as often as a low charge or airflow problem but I have found quite a large amount of txv bulbs partially mounted to the suction line by 1 or two small zip ties with the bulb even over braze joints where the surface contact is no good. If there is a partial leak of the refrigerant from the bulb, it will not apply the correct opening force.

[@faridjahed]

Very nicely explained and easy to understand No one has better videos than you Thanks

[@acservicetechchannel]

Thank you very much, I am glad the videos help!

[@acservicetechchannel]

Thank you very much! I am glad you enjoyed it!

[@keithhoward3181]

Awesome Job Brother

[@SombraLocs]

This is what I have problems with. I once overcharged a system because I thought it was low on charge, so I added refrigerant. I was trying to get my saturation temp above freezing point, but it would go up very slowly and my head pressure would rise drastically.

[@SombraLocs]

Another great video!

[@jimbola77]

excellent video!!!!

[@Oopsie223]

Such a good channel. Thank you so much!

[@acservicetechchannel]

Thank you very much Brandon!

[@johncote2776]

I have had this happen several times already. On a fixed orifice, would this mean the piston needs replaced and to replace the filter drier and blow the lines with nitrogen?

[@michaelcostello6991]

If you have low suction pressure and you add refrigerant how does it increase sub-cooling when the vapor pressure stays the same on suction side due to bad TXV or restriction etc I assume you have more liquid backing up from the TXV in to the condenser so the liquid can loose sensible heat over a longer distance between the TXV and some point further inside the condenser. Please advise

[@acservicetechchannel]

If there is a liquid line restriction and refrigerant is added, the only place for it to go is in the condensor as a liquid which increases subcooling, thanks

[@waltw8230]

Hey Craig, would a liquid line kink or restriction cause a system to pump down on start up? I know it could be a few things but could that be one of them?

[@acservicetechchannel]

Yes but it would have to be significant. Are you sure it is not the service valve though? Did you take a temp reading across it?

[@ddcws1]

Can you please explain what is going with the system if there is a restriction. I read somewhere that you would have high compression ratios and low amp draw with a restriction. I get that the refrigerant is less dense so it would give you a lower amp draw because the system isn't having to work so hard but I am not understanding the high compression ratios. I would think that if it had high compression ratios it was working harder? I am a little confused with this. Thanks.

[@acservicetechchannel]

You kind of have a back up situation where one side is really low and the rest of the system on the other side has all the refrigerant so you will have this high pressure stuck there while the other side gets lower. The thing is that a restriction will only be partially visible and in the case of a txv system you will keep gaining subcooling while charging but the vapor side will not rise and you will not have a good temp rise across the coil as you have too much superheat and not enough of the coil is in a saturated state. You are asking some good questions! Thanks

[@ddcws1]

acservicetech So that's where you are getting your higher compression ratios from? The low side having lower than normal pressure and the high side having higher pressures.

[@acservicetechchannel]

Yes that is correct. The high side pressure is high because it has no where to go. The low side does not move even if you add more refrigerant. It has a higher compression ratio even if it is a little depending on how big the restriction is or how little refrigerant is making into the evap coil. Next time I run into one, I will have to check the amp draw before and after I fix it. You will know when you run into these because you will have the correct subcooling or maybe a little less and when you add, the vapor side does not come up in pressure. Your superheat will be high and you won't have 18-21 even if it is not humid in the house. Great Question!

[@SombraLocs]

I was at a call where I had 55 degrees superheat and 41 degrees sub cooling. I had really high head pressure and about 60 psi on my low side . On a 90 degree day. Could this had possibly been a restriction? The evaporator was partially frosted.

[@acservicetechchannel]

Great Question. I would like to get some more info. Just to make sure, we are talking r-22 correct? Was it a txv or piston? Did you happen to see the tonnage of the evap and the txv compared to the AC Condensor, if it did in fact have a txv? Do you know if someone else was trying to work on it before you? I would like to get more info first when you reply, thanks for the great question!

[@SombraLocs]

+acservicetech It is R-22 with a piston. I couldn't tell what tonnage the condenser was because it was pretty old and the data plate info was completely rubbed off, it was an old Rheem. The evaporator coil was a Bryant Model # CK5AXA030000AAAA, is this a 2.5 ton? The owner told me another company was there and added charge, but he said it was working fine until a couple a days ago. I don't see how.

[@acservicetechchannel]

So I would say that you do have a good handle on it. Extra subcooling means too much charge because the condenser coil is the only place the refrigerant can go. If you are only getting a little amount of refrigerant into the evap coil then you will have a high subcooling anyway but likely not that high. If the evap coil is only frozen or frosted at the bottom but does have a high superheat then that means that there is a restriction in the line as there is not enough refrigerant going into the evap coil. Since it is a condenser instead of a heat pump, you can't even try cycling it from heat to cooling to try to unblock something inside temporarily. I would say it's a shame but a restriction of some sort is what it is, which may likely be near the orifice chamber but could also be in the distributor lines. GOOD JOB!

[@ericdaozero]

This morning we woke up with no cooling at all. The AC is running like normal. Compressor is running, quiet. Not like before; where it used to be loud and sounds like there is a load on it. I bought the same Manifold Gauge meter as in this video a few years back. I didn't really use it till today. I want to learn AC but never got around to it. I plug it up and the reading shows: the blue side (150 blue, 82 Green). Red side (150 red, 80 green). So obviously the this is not right. I have an R22 system. I know that much. Also. When I was plugging in the blue side gauge line before, it use to blow out air. But now I get liquids seeps out. Can someone explain what could be the problems? Thanks in advance.

[@acservicetechchannel]

Hey Ericdaozero, it seems that your compressor is not running. Shut the power off to the unit outside and check the capacitor. Then move on from there. Make sure high voltage power is off during any tests. Make sure you are EPA 608 licensed before working with any refrigerants but it sounds like an electrical problem, thanks

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