AC FREEZING, FURNACE OVERHEATING? Quickly Find the Airflow Problem on a Furnace or Air Conditioner!
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- Опубликовано: 9 июл 2024
- In this HVAC Training Video, I show How to Quickly Find the Source of an Airflow Problem or Blockage that is Causing the Furnace to Overheat or the Air Conditioner to Freeze! I Show How to Measure the Actual CFM (Cubic Feet per Minute) of Airflow by Taking Static Pressure Measurements on the Return and Supply Sides of the HVAC System. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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Exceptional explanation of static pressure Craig
I’ll say!
Best video's on the internet for Hvac. I've been watching them for years and still learning and relearning daily. Thanks for making this happen. Well done.
Craig, since I’ve seen very little comments about it, I’d like to mention also that some brands of furnace the secondary heat exchanger is another place that gets clogged up and is often overlooked.
I’ve seen this. Pulled the blower and doused it with coil cleaner and cut in the top plenum and sprayed Down. Used 2 cans
I agree 100%. I was waiting for him to mention this.
Very common now with high efficiency furnaces. If that coil is dirty the secondary is also plugged up
thank you. I'm doing a career change into HVAC and the books can be really boring and hard to take the info. these videos have been a great way to re enforce my knowledge. thank you and please make more content!
Having 58 rental units to contractually care for I have become quite proficient at in unit coil cleaning. Renters tend to remove filters instead of replacing them. I have developed my own system for cleaning furnace "A" coils in system when possible. An expandable V shaped water and dirt collector of my own design is installed below the coil and a shop vac attached. I use the red acidic type cleaner with a carpet blower providing fresh air to me. I wear safety goggles and a face shield along with charcoal respirator. (I learned the hard way)
I scrape away as much as I can, spray the coil then rinse. Repeating as necessary, often 4 to 6 times. Then when its clean enough I rinse til I am sure it's not acidic then I am halfway done rinsing and rinse it a few more times.
If the coil box is too close to the heat exchanger I remove the coil the old fashioned way and clean it outside but I can do many of them without removing it to great success. After 10 years of working on the same units I have not had any problems. Only 1 blower motor failed early on because I failed to cover it correctly but no coil thinning or leaks.
That collector sounds rad -- you should maybe make a video. Trying to picture how I would DIY it, and coming up blank!
Another great video ! Thanks for sharing the information
This Is real Video Help People HVAC.thanks So much Im feel lucky Know your Channel it's so amazing.
Awesome stuff, can’t get enough of your videos. Can you maybe do some more furnace trouble shooting videos as we are approaching heating season
As always a great video. I wanna thank you for continuing to put these videos out. 👍🏾👏🏾
This was my favorite video of yours by far!
Great tip Craig. Thanks for sharing.
Excellent video as usual from you Craig. Keep up the good work. Cheers!
Thanks!
Always the best training &info.
When ya see a blower assembly,motor,impeller etc.,full of gunk, good chance the evap.is compromised
I just started teaching and your videos are a tremendous tools thanks
That’s great explanation. Thanks Craig
An other excellent video . Keep them coming! 😊❤
Good stuff even though I've been out in the field almost 30 years it's always good to focus on the stuff we might overlook at times when we get too many calls dumped on a great video again always
Excellent video and information.
Thanks for the great training
Great stuff! Love this material!
Thanks for the video, that was awesome =)
Big like Craig, super informative
Great work and information
Very educational video! Easy to understand...
I like this video from Tanzania country
I appreciate you ! Good work!
Really good video. This helps me check things more efficiently
Well done.
Great Video Craig, TY 👍
Well explained, good work
Good job
Thanks for the video well done
LOVE THIS CHANNEL💯👍 , GREAT CONSTANT IMPORTANT INFORMATION VERY HELPFUL . 💯💯💯
Awesome video!!
Great vid🙏🏾
You are an hvac saint
Again awesome
Pretty good video. Thank you.
Great videos 😊
your the best my man
I have better understanding of it now, thank you
Excellent...All the way around.
Informative video. Pulling those A-coils for the purposes of cleaning the inlet side of the coil is labor intense and, therefore, time consuming. Once it's out, cleaning both sides should be done.
Well done
Awesome thank you
Nice video!
I mean, I do have that very manometer. And it's really good. But I rarely use it when dealing with airflow issues. I just make it a habit to check coils, even hard to reach ones. A poorly performing system can have many reasons behind it, but it doesn't take too much effort to look at the coil. I have my light, drill, and a good brush typically get the job done. And a lot of elbow grease. Sometimes I'll use a shop vac or something. A brush usually removes those wool sweaters. But I really do like this systematic approach. Very thorough.
Nice info
NICE!
Awesome
👎from trolls, so what.
Some kids will never learn.
Great teaching, honestly.
Good on You! 👍
hello from iraq eith you well done great job
Great Vid! You AC guide book is an excellent resource. Do you offer a heating workbook/guide or a component guide?
Great video! That’s why you should change your air filters regularly 🤢
What is the cheapest static pressure tools?
Thanks for your help.
Could you do the same test and make a video showing a clogged secondary heat exchanger???
Maybe explain how to take static pressure in more detail for the apprentice just starting in the Field
Do you check static pressure while the ac or heater is on? Or just run the blower motor instead with out ac or heating?
Great videos sir
Can coil cleaner chemical drippage/residue damage the furnace heat exchanger ??
Does the total external static pressure also indicate an undersized duct system?
Hello, do you have videos over HZ311 Zone Boards, is it possible to do a video over this if you don’t have any as a future topic? Thanks
How can I get clean the A without apart them? Any tips
Good job 👍
Can you show how to clean this kind of Coil?
why is .5 the design static pressure?
If the back of the furnace is open to service ( not to common ) the back of the Evaporator coil doesn't have the line set or metering device or distribution tubes in the way. Be very careful cutting open the sheet metal not to hit the U tubes on the back side of the coil. Also found out not to hit coil with screws attaching new cover.
Great video. Would you elaborate for me I’m a little confused.. Do you not subtract the (-.21) from the (+.87) giving you (+.66)? And would you explain why?
He is determining the total pressure drop across the evap coil. Pressure entering the coil is + 0.87" w.c. Pressure on the downstream side of coil is + .021"w.c. So the pressure drop or restriction value of the coil is +0.87 minus +0.21 leaving + 0.66"w.c. of resistance to airflow.
You are finding the diference between the two so it is 0.87 - (-0.21) = 1.08
👍
That doesn’t rule out a plugged secondary or primary heat exchanger ?
What’s the name of the scope /?
Taking static pressure seems to be an unnecessary step for this troubleshooting example. Wouldn't it just be easier to pull back that coil plate and look with a flashlight? What other ways would static pressure be utilized? Would undersized/oversized duct work cause this problem? How would you accurately address it? Thanks for another good video!
Drilling a couple small holes is much quicker than taking apart a coil compartment. And if he’d have not gotten such lower pressure above the coil he could easily have kept moving through the ductwork. There are many possibilities for high pressure (insulation coming loose inside ductwork or vents that are closed). As far as ductwork undersized your only option is to change it. At least the first few sections until you have some vents relieving the pressure.
How did it get that way? Most logical suggestion?
No filter was installed on the return before the coil. Years of neglect. A home with animals that shed could also be a contributor.
Eu sou técnico de ar condicionado, como eu faço pra trabalhar na sua empresa
ALWAYS REMEMBER THE SECONDARY HEAT EXCHANGER ON A 90%+ FURNACE. HAD A FURNACE THIS WEEK THAT HAD A PLUGGED SECONDARY HEAT EXCHANGER
especially those fuckin carriers
If the evaporator is really dirty, the blower wheel vanes will probably also be dirty. Pull blower and clean vanes.
Now whatever happened to the old water gauges.😎
Thanks for the videos!
🍺🍺🍺🥃🥃🍿🎯
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses!
That cabinet needs some POR-15
Line set to old it’s a dirty filter or dirty coil
This is still all really confusing. I thought static was air resistance. Why does the meter show a minus number at the return and a positive number at the supply, how does the meter know the air is sucking or blowing with just a rod with some holes in it stuck in there? I thought total external static measurements was a measurement at the return and a measurement in the supply.. not a measurement inside the furnace. : T
Comparison with the actual room pressure measured at the meter.
Evaporator coil on the top of blower motor is a stupid design which makes evaporator coil cleaning much difficult
Too much technical terms , keep it simple