Superheat Charging Method: What to do When you Don't have a Psychrometer to Measure Wet Bulb Temp!
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- Опубликовано: 29 сен 2024
- Superheat Charging Method: What to do When you Don't have a Psychrometer to Measure Wet Bulb Temp! How do you find the Wet Bulb Temperature when you are in a Pinch Without a Digital or Sling Psychrometer? I go over a way to find the Wet Bulb Temp Without the Psychrometer when you are in a Pinch. In order to Check the Refrigerant Charge in HVAC systems that have Piston/Orifice or Capillary Tube Systems, you need to find the Indoor Wet Bulb Temperature and Chart against the Outdoor Entering Air Temperature located by the Condenser Coil. Outdoor Entering Air Temp can just be done with a Temp Probe and I go over how to get the Wet Bulb so that you can move on with your Process and get the job Done Correctly! Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.
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Look to da-feet guys --- just cut off about two inches of your shoe lace and put that on the end of the bi-metal
Thank you so much for this video. This helps me much further.
Glad to help Justin!
Can I get an accurate wet bulb temp by using a dry bulb temperature + humidity chart?
Can you make a video on where to take your wet bulb/dry bulb temperatures at?
That would make a great video, Thanks for letting me know what you would like to see.
I think he already did.
Wet bulb= hold your psychrometer next to your largest indoor return grill.
Dry bulb= hold your temp probe about 6 inches away from the condenser, out of the sun. Down low and on the shade, not at top where heat is blowing.
Line the numbers up on your superheat chart and you''ll have your target super heat.
hey man so should ido wet bulb dry bulb reading before icharge the system with refrgerant pls help
Yes you would check your target before turning the system on just to find out the where you are at but you will still need to wait 10-15 minutes before charging unless the low side is below 2 in which case you would need to add. You will need to recalculate the wb every 5 minutes or so because wb will lower and the superheat target will change, thanks
great video!!!!!
Thank you for your comments!
If I had a wet sock over the temp sensor how long would you leave it there before you read it
So if it was a mercury bulb and right next to the fast moving air at the return grill, about two minutes but make sure that the sock is able to wick up more water as needed at the bulb. A sling psychrometer makes sure you have enough air moving while holding a container of water and additional sock to wick. If it is a temp sensor like the one showed in the video, it is just about 20-30 seconds. This is just in the worst case scenerio when you don't have a sling or digital psychrometer. Thanks
is the blower has to be on...? or working to calculate the wet bulb..?
Yes that is correct, it has to be on and you would recheck this every 5 -10 minutes while charging, thanks Erick!
hey so should ido wet bulb dry bulb reading before i charge the system on empty system only the indoor fan should be working
Yes you would check your target before turning the system on just to find out the where you are at but you will still need to wait 10-15 minutes before charging unless the low side is below 2 in which case you would need to add. You will need to recalculate the wb every 5 minutes or so because wb will lower and the superheat target will change, thanks
What do you mean by the low side? Could you elaborate on thar?
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You have a video for literally every question I have about this stuff. Great job. Thanks.
That's awesome to hear, thanks Lenny C!
No sir with all due respect, the wet sock on the thermometer isn't about an accurate temperature reading. The wet sock simulates 100% humidity to determine the lowest attainable temperature for the evaporation of the water.
Wet-bulb temperature is the temperature at which water is able to evaporate at 100% humidity. Wet-bulb temperature is your lowest degree obtainable within the current dry bulb temperature and surrounding conditions by the evaporation of water.
I know it's your video but I can't help it, physics is my area and I get these little quirks in my head I just want people to be as smart as they can be sorry and very good video.
The video is all about getting a correct wet bulb temp if your psychrometer breaks, yes you are correct, thanks!
I think that most new tech's are getting confused about Target superheat and Actual superheat......they are not being taught that target superheat is just the starting point.......and they have to retake the WB temp and recalculate the superheat until they dial the system in.....on the actual superheat.............maybe I'm wrong ....but that is how I do it
You are absolutely correct and that is what I try to teach in the videos. I will see if I can make it a point to really spell this out and repeat it for the next superheat video. Thanks for the comment!
Your the man.....enjoy all your videos!!!!ive learn more than what i did in hvac school....now i feel like they ripp me off!!!@...but thanks alot for all this info...very much appreciated!!!!
Thanks victor guerra!
You can use dry bulb temperature and humidity percentage to get web bulb temperature by using an equation. There are several websites that can do the calculation for you. The result is actually quite accurate
If the house has two AC systems, one is running.... Does this throw off the WB temp?
I'm new to all this... Do maintenance now for about a year. Just became epa certified, etc. I'd watch the AC techs when they came out to learn u know. But NONE of them ever do this stuff. Just hook up gauges and add some "juice" if it needs it. Just seems like guess work that way, or just getting close. Interested to hear your thoughts on that
Ha ha, you are absolutely right. The problem is that these just kinda getting by techniques are not good for compressor safety or efficiency. You may be watching them checking subcooling if they a temp sensor on the liquid line since the target subcooling is posted at the outdoor unit, thanks
acservicetech never have I witnessed that either. No temp sensors, no subcooling, superheated, etc. It baffles me. Had one about a month ago come out. I knew it was low on charge, etc. But we didn't have any Freon at the time. He had his gauges on there and was adding it and said see it fluttering there, that's the txv. I said no it has a piston. He said are you sure?? I was sure cause id done the measurements already, and did my wet bulb like you'd shown with my meter. Sorry so long
acservicetech also, thanks for all the stuff you put out there. I've learned a lot from your videos. Youre a good teacher
Oh wow, I'm sorry to hear that! Thanks Mike!
Can I check indoor wet bulb temperature/condenser dry bulb temperature with a fieldpiece sig1Gum Style IR laser thermometer?? if I can do it how long do I have to wait to have get better reading?? Thanks..
Not a good idea to put warm fingers so close to thermocouple tip. The thermocouple wires can conduct heat up to thermocouple bond, especially if thermocouple is using larger gauge wires.
This also applies to raw thermocouples being used for measuring suction or liquid lines. Good to tape them to pipe for couple of inches up from thermocouple bonding tip so the lead wires get similar temp to tip to avoid ambient air temp getting conducted up the metal wires to tip.
Do you need to restrict air flow at the condenser to simulate a 95'F day?
You would need to get the liquid sat temp up to 90-100 degrees by restricting airflow at the outdoor unit in order to check subcooling. The inside of the building needs to be 70 degrees or higher, thanks
Lower the relative humidity, lower the wet bulb temperature and higher the latent heat of evaporation in the evaporator?
Why is target superheat related to the wet bulb temperature?
Could you explain that superheat formula 3 times wet bulb temperature-dry bulb temperature -80?
Thanks
Thanks for this video ac service tech you safe my day today, my psychrometer was broke when I looked into my backpack today and I remembered this method of yours and I was able to figure out the super heat which I was total confused about and I got the unit right. I thank God for people like you than want to help us.... thanks again man....
Praise The Lord! Thanks eman3208!
can i use an indoor outdoor thermometer with a wet rag over the outdoor probe to get the wet bulb? if so how would i get the set bulb from that? do i use the wet probe temp and humidity ? do you have a calculator for this? thanks
Imagine you are a new tech and your sock gets sucked right off your temp probe from the return 😂
Hello and thanks for all your videos, I have 2 questions. Question 1…..I recently replaced a 3.5 ton unit 410a at my home with a 16 SEER Grandaire.. The old Carrier 13 SEER unit 410a was installed in 2006, a Lennar home I bought in 2011. A couple years ago I moved the fan speed from med to high because of the 6 degree temperature drop I was reading at the exchange in the furthest room to help move the air faster so it wouldn’t pick up as much heat from the attic ductwork. The ductwork is inspected and all good. The other reading was taken on the supply side out plenum. It’s at it’s worse during the summer on a late sunny afternoon. The humidity remained around 50% during the summer. I Live in Central Florida. So it was working good. Now with the new unit, same settings, the humidity hovers around 60% RH. When I run the AC at the usual 75 degrees, it drops to 57% RH then after it turns off it’s back to 60 in no time. It was running on and off all day today and it was about 77 degrees out today. I can’t get it down to near 50% RH. I’m using the same media filter box with the new unit. Could it be because of the higher SEER new unit? Everything is sealed up tight on the air handler and return. I know, I sealed it😄. Installers did a real crappy job sealing anything.
Question 2…I did a WB reading at the return by the air filter box. I did the DB by the condenser. I calculated a 14 degree Total Superheat 60 degree WB & 72 DB. I also did the the reading at the condenser unit port and had a reading of 43 degrees on the gauge and 61 on the thermometer or 18 degrees Superheat. Sub cooling is 10 on the unit and I’m reading 10 - 10.5 degrees. Since my line set is approx. 75 - 80 ft long, how much should I subtract for temperature loss for my thermometer reading at the condenser unit? The condenser unit is lower then the air handler and outside in the backyard. Air handler in the ceiling of the garage laying horizontally. A lot of info but hopefully my questions and your answer will help others too. Thanks.
Did you figure out the humidity issue? Was it a short cycling issue or maybe an evap coil bypass issue either by design or pehaps 1 circuit was plugged?
@@u2ooberboober short cycling had to do with time of year as it got hotter out the AC runs longer now.
Thank you for the great videos. I wish I was in your service team . I have a question. Can we use the dew point temperature or wet bulb temperature from Google weather ?
No we use the specific dry bulb temp 1' away from the outdoor coil and the wet bulb indoor temp at that point in time. As the unit runs, the wet bulb temp will decrease, changing your target superheat, thanks!
Is that the chilled air supply grill which is as same as the indoor blower in the split and the window AC ?
You mean the wet bulb is the temperatures of air leaving from the indoor ?
It is the temperature of the air entering the system which is called the return air, thanks!
@@acservicetechchannel got it. So can you tell me , for the split one, where should i measure this please.?
Whene do you read your wetbuld? Fan running or ac running?
Redendo Angaoan you read it at the return air grill with the unit running.
hi, do you do this with ac on or just fan on without ac? thank you.
AC on while checking the charge, thanks!
Do you turn air conditioning on?
Or do you turn fan on?
You could check the first time with just the fan on and then every five minutes while the ac unit is on, thanks
Nice video thanks!! Keep"em coming.
Thank you!
I ripped my t-shirt and tied it with duct tape)
Ha, nice
What do you set your multimeter on
That was just temp F with a wet sock
You are so awesome bro...thnx😏
Glad for helping Damarco!
What’s your Instagram account
I presently do not have one, thanks!
Good tip, thanks!😎
Thank you!
This videos are great
Thanks Steve!
good Shyyt thanks...
Ha thanks
Is the wet bulb taken while the system is running?
The wet bulb can be taken before the system starts running and then every five minutes or so while the system is running because the wb will decrease as the system runs. That would be done with a sling or digital psychrometer. If you were taking the wet bulb like in this video where maybe your digital psychrometer is broken then you have to make sure that air is blowing by the sensor the first time and each subsequent time. Thanks for the question! Make sure to apply this new wb to the superheat chart as you check again------ruclips.net/video/bIL9BrKCujc/видео.html
Thanks for your answer.
Glad to help!
Great Question! Yes, the closer to the return of the hvac that you can take this measurement, the more accurate it will be but for instance if the unit is located in the attic you dont want to have to pull the door off and read it with air from the attic going in. Likewise in a basement or crawlspace you don't want air coming into the unit because you have a door off. This will also be the wrong wb anyway because it is not the temp and humidity from the house. Normally I just hang it off the largest return grille in the house and go back and check it every five minutes while the system is running as the wb will lower while it is running which will change your target superheat. I hope this helps.