Step by Step instructions on how to properly Check Refrigerant Charge!

right this videos for checking subcooling on a r22 condenser right now you see the pressures on the low side are 54 psi on this side and on this side which is the high side you have a hundred and forty okay so the low side were vapor suction side okay you can refer to it as any of those is about 55 psi the discharge high side or liquid line okay that is actually at a hundred and forty roughly PSI G pounds per square inch gate so we have them attached right here on the liquid line ready always goes in liquid and blue always goes to the vapor line these valves have traitors in them traitor valves alright and so when we attached our hoses in it press from the trader valve and allowed refrigerant to come through the hoses and enter into our gauge our gauge set is shut right now if this handle was open it would connect from here to here if this handle was open it was neck from here to here both of them are closed and you want to make sure they're closed while checking the refrigerator charge we want to do is you want to let that system run for maybe 10 minutes and then after that you can go ahead and check your refrigerant charge so this system has a thermostatic expansion valve and it actually has the bulb man outside on the suction line so I can tell that it does have a txd I've checked the subcooling on the rating plate the rating plate is located right back here and the rating plate says that is calling for 15 degrees of sub cooling sub cooling is the temperature decrease in liquid form so that's on this gauge this is liquid we're looking for the temperature decrease in liquid form so we're going to take the temperature that's on this line right here okay and we're going to subtract that from the saturated temperature which if you follow the needle back it looks like it's right at about 80 degrees for our 22 for saturation temperature so let's go ahead and find out what the temperature is on the liquid line what I what I usually do is I use a multimeter with a temp probe all right so I use this temper of right here with this multimeter in order to figure out the temperature so we can turn that on says it's 70 point three degrees this little piece of metal right here it's when you combine two pieces of metal that's what makes up a thermocouple two dissimilar metals this is actually able to read the temperature here I just touched it so the temperature went out very very rapidly okay the temperature on this little ball is able to change very rapidly compared to something that would look like a stick the three temperature but even if it's digital it's not going to be that great compared to something that's very small so we're gonna mount this line on and there's a couple ways to do it you could have different type of temperature probes but in this case we're going to use a thermocouple style and we are going to put some electrical tape on to the liquid line and that's going to eat that piece of metal tight up against the fight and also if there's the Sun beating on it we can put a little piece of insulation on there as well in order to stop the heat transfer from the Sun so right now it reads 77 degrees on the liquid line we take this head pressure discharge liquid pressure cut it's at 141 142 and it roughly reads 80 degrees saturated temperature this is like a actual pressure temperature chart built into your gauge okay so you met we minus 80 we actually minus 78 from 80 and we come up with two degrees of sub corn so that means that we just barely have liquid going to the TX today so what we need to do is actually increase the charge if the sub cooling is low then that means you need to add refrigerant all right so r22 that can get charged in as vapor okay if you're charging it in its liquid you want to charge it through a liquid vaporizer check out my next videos for charging HVAC systems this is AC some respect hope you enjoyed yourself

Channel: AC Service Tech LLC

Views: 813,640

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Id: SUyN94Y39Ro

Length: 4min 48sec (288 seconds)

Published: Wed Apr 06 2016