I am Eric Shidell, the HVAC Service Mentor. I was a top HVAC service technician running calls and getting things running when no one else could. A true HVAC nerd, I ate, slept, and breathed HVAC systems for twenty years. In an attic on the hottest day of the year. On the roof in the middle of a blizzard. Covered in soot in the boiler room at 3AM. I also mentored technicians during that time.
Since 2014 I have trained HVAC Technicians with class offerings in a variety of areas including Gas Furnace Training, Air Conditioning Training and Boiler Training.
I have conducted training sessions through lecture and hands on at distributors like Johnstone Supply, Charles D Jones and Rampart Supply. I have also administered training for Xcel Energy and have conducted private training events for Pueblo Housing Authority, Vail Resorts and other private HVAC contractors throughout the state of Colorado. I have learned the secrets of what it takes to be at the top of the service field.
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I’m finding this class very informative and well tought. It’s been 40-45 years since I handled refrig/hvac. And I’m wanting to learn again. Thanks !
How to get the outdoor temperature in °C?
Awesome very intuitive helped me understand it.
I got a second opinion furnace call and when I got there, the house was 79 degrees and the lady said the furnace had not stopped running since the first guy left at 10 am. All I had to do was remove the alligator clips from R and W and guess what? The furnace shut off!!! I guess he fixed the problem and kind of left in a hurry. I didn’t charge the sweet lady but kept the jumper.
So if I’m testing a TXV on a geothermal heat pump, I can switch to heat to effectively do this same test?
This is a great video !! Easy to understand and yet it also made me think. A video on Heat Pump Hot Water Heaters would be great as there seems a lot of voodoo around them.
Excellent. Many thanks for this. I thought I was going mad with mine.
a quick question! how did people make ice in the past before refrigeration and how did they move and make it in the summer months?
Top notch explanation and with field example 👏
But... The condenser is not condensing without the fan.. you are feeding hot gas into the txv.. how are you testing to TXV when you are creating a fault for the TXV to not work properly?
Brilliant, simply brilliant. 👏 Does blocking the intake or discharge air produce a similar result without removing live wiring and potentially shorting out something, like my lifespan?
I like him😅
Thts a way to burn the fan 50 percent voltage disconnect the cap. Safer too
Disconnecting the common leg from the fan will not cause any damage to the motor. This is exactly how single pole contactors work.
my customer complains that unit shuts off, stays off 15 minutes then comes on for 2 minutes and off again. Is this a cycle rate problem.I like that the unit stays off 15 minuted.
If the unit only runs for two minutes every 15 minutes, that is four starts per hour and only 8 minutes of run time per hour. I think there is probably more to the story.
Well done Thank you for your sharing
Great video. Thanks
Glad you liked it!
Thank you very much
You are welcome
Thank you
You're welcome
Dont let those crazy Kevins and Karens mess up a good strategy 😂
Great video
Glad you enjoyed it
30:48 - I was taught the complete opposite. When a unit is low on refrigerant, your manifold gauge will show high Superheat, low Subcooling, and low pressures on both sides. And since temperature & pressure are directly proportional, the lower your temperatures, the lower your pressures. You even confirmed this at 33:22. Would you please elaborate on my confusion here? Thanks.
This is a very insightful question. I apologize for the delay in response. To be clear, we need to differentiate between the temperature of saturated refrigerant which follows the pressure / temperature relationship you mentioned and the temperature of superheated vapor leaving the evaporator in the suction line which does not follow that relationship. High superheat will be the case as you mentioned. If you start a unit that has low refrigerant with low suction pressure and a saturation temperature of, say, 20degrees (well below freezing) and a high superheat of 25 degrees, the suction gas temperature leaving the evaporator will be 45 degrees (well above freezing). Hope that helps clear things up.
@@hvacservicementorOh man; thank you so much. That most def cleared things up for me. I've been in the field for 2 years now, and never considered that superheated vapor doesn't follow a pressure/temperature chart. I always assumed that, no matter a refrigerant's pressure, you can always convert that to a known, relative temperature.
THIS IS SO HELPFUL!
Thanks for the kind words. I think someone has to be a true HVAC nerd to dig this particular video. That is a compliment!
"You can't watch the sensing bulb and the suction pressure at the same time." *Job Link probes have entered the chat*
That's a good one! meanwhile, by the time you have taken those fancy gadgets out of their padded case, and done all the work to dig the sensing bulb out of it's home, and put it back nicely and fixed all the armaflex and cork tape and mastic you had to remove to get to the little bugger, the tech who followed this advice is already paid and on to the next job or at home with their family at a decent hour!
Thank you for the explanation!
Glad it was helpful!
Thank you
You're welcome
10/10 presentation
Pure gold... I'm talking 24K...
Fluke = waste of money, i got two and they read totally different
My right ear feels lonely.
Ok so it wasn’t just me lol
Incredibly good. You are a born teacher. Thank you!
I'm glad you found it useful.
Please cover heat pumps as well
Eric, you are spot on. The most important thing to do to understand the problem the customer is having is to talk to them. The second most important thing to know when troubleshooting is the equipment's sequence of operation. I can tell that when I worked for other people I unfortunately never had a service manager that understood the importance of this, all of them were parts changers, even though one of them had actually taken a two year HVAC course. Sad, but true. That's when I decide to go out on my own since I knew I could do better than what was already out there. Thank you for this video! All five points are critical to successfully troubleshooting an HVAC system. I retired in 2022 after running a very successful HVAC business. I often out-troubleshot the BIGS'S technicians, but why was that? The reason was, first of all, I knew my stuff, second of all I knew how the equipment was supposed to work, and thirdly I followed a logical step-by-step process(i.e. what is supposed to be happening and why isn't it) to solving the problem. Eric, I wish I would have been able to work for you. Hope you're having a wonderful life and thanks for imparting your knowledge on us.
Thanks for the praise. It means a lot coming from someone with your background who knows what they are talking about. I can tell you love the trade and care about your clients, and that's an important factor for success.
What if you have a high, medium and low cycle rate what do you set it on for the best Heating in your house and Cooling in Michigan
During this test test (ie raising head pressure) if pressure remains the same then TXV is good. What would bad look like. How much change in the suction pressure would be considered bad.
1:42 - TD on the exams refers to the difference between the saturation temperature and the temperature of the media having heat removed. The greater the difference the more heat is moved.
Not sure which exam you are referring to, but I have never seen that on any exams I have personally taken. I can say that it can often be confusing for a lot of people because there isn't really a strict standard of terminology in our industry. Not like medicine for example. There are also regional influences and traditions where in one part of the country people use one term and in another part of the country people use a different term for the same thing. For example, the value that you mentioned is also referred to as approach temperature. This is completely different than the air temperature difference across the evaporator. When we are examining the difference between air in and air out of an evaporator coil, delta T greater than standard for the existing conditions results in less total heat moved in BTU/h. This is extra fun when reading plan drawings from engineers who may be from another region or control points. I know what an RTU is. I know what a CU is. What the heck is an RCU?
What a jewel! If you were a betting man, you’d win the bet every time that I’ll be using this trick for the rest of my career! Thanks for the _great_ content.
Thanks, Gary!
My multimeter does not beep when testing ohms ..
I too enjoyed the video but I didn't get the definitive answer on the TXV being good or bad. I hear "stuck in one spot" bad, but then I hear in the comments "stays in one spot, functioning properly" which is what a TXV is supposed to do, keeping the superheat constant. I'm subscribing because I think you really know your stuff! So in this case, was it good or bad? Thanks
It would be more accurate to say "stuck in one spot, not functioning properly, but still delivering performance that is good enough for the customer to not notice the problem in spite of the fact that it is technically broken". Hope that helps! The TXV in the video is perfectly fine.
Great Job😊
Thanks 😁
Hello and great contents.I am still a rookie in the field and today I am eager to learn about thermostats!! Let's suppose a DAIKIN/Toshiba/Mitsubishi...I have opened one of those recently but did ny see any of those terminals other than 24V DC terminals and a printed circuit board!!!Can you please make a video on how those modern electronic thermosats work!!! Schematic diagrams will also be very helpful and appreciated.Thank you
Many mini split units like the ones you describe do not have conventional thermostats at all. They use a remote control with a temperature sensor located on the air inlet side of the evaporator. you can see a little black probe if you remove the filters. The remote only sends a setpoint command to the unit one time. All the control logic is in the fan coil unit. Those systems are highly sophisticated and they are all different from each other. They operate very differently from larger conventional split systems. I know that isn't very helpful. That is an industry wide problem with those types of units.
@@hvacservicementor Great cover.Please if possible do a video on them! Thank you
Do these work reliably in refrigeration?
Refrigeration tries to remove as little moisture as possible. I'm not aware of a good use for psychrometers in typical refrigeration applications.
[Edit] - I found the answer to the question below in your video titled “What is the proper Temperature Drop in an air conditioning”@ time 2:36 - [1. SH, 2. SC, 3. DeltaT]. 13:41 - Maybe I missed it. I expected you to say the three tests here. I’m new to the trade and any help in the troubleshooting process would be appreciated. Thank you for sharing your knowledge in these videos. Simply three tests will get me closer to a solution? What are they again?
I love a tech who can go back and review and find the answer. Great job!
as a new tech here, that shows that the TXV was operating properly, if it was bad would my suction line pressures rise as well or decrease?
If TXV is frozen in some mid position, it will behave like a fixed metering device and suction pressure will rise along side the head pressure.
Mine's a 3 yr old Carrier 59sc5b propane. Just started burning and never stopped. The heat woke me up. Good thing I was home. Power off, Power on, fixed for a week then started again.
That's what you're paying for in this free service.
@@hvacservicementor I figured out my issue after a few simple tests and application of some logic, also free.
HI, what is the formula you use for the table in 48:00 ?
That table was extrapolated from the old slide charts that major manufacturers used to hand out over the parts counter. Carrier was perhaps the best known one, but Trane and Goodman made them as well. Nowadays, that info is sometimes published in the unit catalog or selection documents. It's a bit harder to find. either way, it is not unique to any one manufacturer. There is a direct relationship between the cooling in Btu/h, air flow in CFM and delta T that is true for all comfort cooling applications. When it comes to mini splits, VRF, and special applications like CRAC, these numbers are no longer reliable and you need to go to that individual manufacturer for the right specs. Additionally, for the last decade or so, Carrier brands have abandoned the old standard of 400 CFM per ton on their residential split systems in favor of 350 CFM per ton for all but arid climates. This naturally creates a higher Delta T and they will publish this in their literature.
Very good makes it easy to understand thankd
Glad to hear that!
Does the common wire have power running through it constantly like the r wire?
The common wire will not show voltage in relationship to ground, but it does carry the current of the thermostat's power circuit. This power is very small and hard to measure.
Harbor freight is just a good
23:30 - Technically, the compressor's job is to create a pressure difference by raising the pressure at its outlet and lowering the pressure at its inlet. The job of the metering device is to create a pressure difference in the opposite direction. 46:46 - When you say temperature drop here, are you referring to TD, or ΔT? 48:00 - OK, you answered the question, here (i.e., ΔT, which is the difference between the return and supply air temperatures and _not_ temperature difference - TD, which is the difference between the air temperature and the saturation temperature of the refrigerant).
Why do all this comments seem like the dude payed for them?
How much did you receive for this comment? I think I need a refund. I want to speak to your manager. :)
@@hvacservicementor Thank you so much for sharing the knowledge, I can tell people really appreciate you. I do too, am just sarcastic