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.
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.
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.
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!
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.
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.
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
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.
Unfortunately I happen to have a York unit similar to what you showed with the evap coil above the furnace. Any chance you have a video that’s more step by step on how you clean unshroud and clean a coil in that situation with without disconnecting the line set?
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.
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.
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
Exceptional explanation of static pressure Craig
I’ll say!
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
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.
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!
Thanks!
Always the best training &info.
When ya see a blower assembly,motor,impeller etc.,full of gunk, good chance the evap.is compromised
Another great video ! Thanks for sharing the information
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!
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
I just started teaching and your videos are a tremendous tools thanks
This was my favorite video of yours by far!
Great tip Craig. Thanks for sharing.
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.
You are an hvac saint
As always a great video. I wanna thank you for continuing to put these videos out. 👍🏾👏🏾
Excellent video and information.
Thanks for the great training
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.
It would be awesome if you guys would incorporate package units into your videos regarding static pressure.
Good job
Excellent video as usual from you Craig. Keep up the good work. Cheers!
That’s great explanation. Thanks Craig
Well done.
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
I like this video from Tanzania country
An other excellent video . Keep them coming! 😊❤
Great work and information
hello from iraq eith you well done great job
👎from trolls, so what.
Some kids will never learn.
Great teaching, honestly.
Good on You! 👍
Great vid🙏🏾
Really good video. This helps me check things more efficiently
Thanks for the video well done
your the best my man
I have better understanding of it now, thank you
LOVE THIS CHANNEL💯👍 , GREAT CONSTANT IMPORTANT INFORMATION VERY HELPFUL . 💯💯💯
Very educational video! Easy to understand...
Great videos 😊
Thanks for the video, that was awesome =)
Great stuff! Love this material!
Big like Craig, super informative
Excellent...All the way around.
Again awesome
Great Video Craig, TY 👍
Well explained, good work
Nice info
Maybe explain how to take static pressure in more detail for the apprentice just starting in the Field
Pretty good video. Thank you.
Great video! That’s why you should change your air filters regularly 🤢
I appreciate you ! Good work!
Awesome video!!
Great videos sir
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.
Well done
Unfortunately I happen to have a York unit similar to what you showed with the evap coil above the furnace. Any chance you have a video that’s more step by step on how you clean unshroud and clean a coil in that situation with without disconnecting the line set?
Awesome
Nice video!
Awesome thank you
Good job 👍
Could you do the same test and make a video showing a clogged secondary heat exchanger???
Great Vid! You AC guide book is an excellent resource. Do you offer a heating workbook/guide or a component guide?
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.
NICE!
How can I get clean the A without apart them? Any tips
Why wouldn’t all AC systems be designed with an easily serviceable evaporator coil (cabinet)?
That doesn’t rule out a plugged secondary or primary heat exchanger ?
Can coil cleaner chemical drippage/residue damage the furnace heat exchanger ??
What is the cheapest static pressure tools?
Thanks for your help.
Can you show how to clean this kind of Coil?
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
why is .5 the design static pressure?
Line set to old it’s a dirty filter or dirty coil
If the evaporator is really dirty, the blower wheel vanes will probably also be dirty. Pull blower and clean vanes.
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.
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
Does the total external static pressure also indicate an undersized duct system?
Now whatever happened to the old water gauges.😎
Do you check static pressure while the ac or heater is on? Or just run the blower motor instead with out ac or heating?
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
That cabinet needs some POR-15
What’s the name of the scope /?
Eu sou técnico de ar condicionado, como eu faço pra trabalhar na sua empresa
Evaporator coil on the top of blower motor is a stupid design which makes evaporator coil cleaning much difficult
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.
Thanks for the videos!
🍺🍺🍺🥃🥃🍿🎯
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses!
👍
Too much technical terms , keep it simple