Next in the series based on HVAC Refrigerant Diagnostic Quick Sheet Bryan talks Symptoms of Low Evaporator Airflow.
Videos on Airflow from our friends at Tru Tech Tools channel:
www.hvacrschool.com/quick-sheet
www.hvacrschool.com/5-pillars
www.hvacrschool.com/terms
Read all the tech tips, take the quizzes
and find our handy calculators at https://www.hvacrschool.com/
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Sup. I am a Residential/Commercial student. I started back in Jan 2020 and graduate April 2021.
Man I wish we actually had enough time to test these things on service calls. That's the biggest problem
I went on a call the other day. She stated she had three companies out and they said everything looks fine. She said I can’t get the house down below 80° on a 100° day. Gauged up to system with smart probes and saw the Subcool was at 11° as stated on the tag. But say suction temp up and delta t only at 12°. Mins you it’s a down flow application. Filter clean evap was clean as I. Was looking at evap I found that the installers had made a wood frame between the coil and furnace. And it only had 3” of a gap on each side of the coil. ADP coil that had about ten inches of flat space on top and the air would dead head there and only 3” on each side where air would maybe get threw the coil. All in all poor install lead to this lady having issues for the last four years.
What are the reasons why the evaporator is half cold, while the other half is a little cold?
I bought a testo hot wired anemeter. And it sucks on flex and box systems where you have a 4ft plenum on either supply or return with multiple flex sizes attached to it. For example. I have a supply plenum inside dimensions 15×17 and Im looking for 800 cfm and measuerment might be close. Then I will then input dimensions 10×10 for 400 cfm. Stick the probe in the same 15×17 plenum and will read 350 cfm. That probe is not an accurate way to measure cfm!
Good evening can I use a 12000 btu evaporator coil I got from a 410a system with a r22 condenser also 12000 btu
I have a high calibrated hand for measuring line temperatures.
I would suggest not taking out all of the parts of the videos when you aren't talking. It's too fast to interpret when there are no pauses.
with all this usefull info , it reminds me of my teacher alsmost at the beginning of the hvac course ,,,he said air conditionning is not a 100% corrrect science ! and anything within 3 degrees is acceptable in hvac . just saying ,,,,thanks for the info
Good morning,I have a question HVAC SCHOOL.
What causes no sweat on suction line
Excellent. Thank you. Just ran into this on a change out yesterday.
Love all your videos. If you speak little bit slower that will help a lot of new techs. Thank you.
When we use pt chart how we can calculate temperature 🌡 for ac ,coling and freezing
How to know what temperature will be to choose pressure of section line
Question anyone why is my fan not going on when i put the thermostat on on or even auto still no air out vents
Man you are very fast .Would you slow down a little bit And make it simpler for a new guy like me
Sir I am from India new cold room cr22k6m compressor starting 35 amps internal trip after 3min starting ok capacitor relay new but same problem please help
I had 78 return, 52 suction saturation and 5 superheat on a piston. Humidity within range (68wb). 435psig on high side, 18 td in a commercial place that wasnt cooling.
On another note how do you feel about testos 417 vanr anemometer for measuring airflow
These are good, they help you touch base, strengthens your foundation
Awesome 👍🏽🔥
Hi Bryan. 1 question. I have a 5 ton split system. It was installed with 2 filter driers. 1 inside and 1 outside. Do you see any problems with this set up.
Good video !!!! Saludos