Well those are 2 different things. Free training is my playlist "learn HVAC" Also skillcat has free stuff. As for hands on, you need to be in person. Volunteer time at a company or het. Hired on as an apprentice. Repetition is learning.
Hey Branaman! I've been watching your HVAC playlist and its amazing. I just wanted to ask what's the difference between psi rating on the left hand side of the digital gauge and the head pressure on the right hand side of the digital gauge.
They are both reading PSI gauge The red represents the high side aka head pressure after the compressor to the metering device. Because it's a higher pressure the gauge goes to a higher number. This means it goes to a higher PSI gauge reading and can handle the higher pressure while the system is running. However with more numbers on the same size dial it's harder to read. Each mark may represent a 5 or 10 psi difference so it's harder to see exactly where the umber is. When it's converted to temperature it tells us where the refrigerant is condensing at outside. The suction side will be a lower pressure from the metering device back to the compressor. Because it's lower pressure the guage does not need to read as high. This allows the reading to be more easily seen. Each mar may represent 2 or 3 psi. It's easier to see where the needle is pointing. It tells us where the refrigerant is boiling or evaporating at inside. The blue suction gauge also called a compound gauge because it also reads negative pressure below 0 psig or better known as "hg or inches of mercury or vacuum. Because it measures positive and negative pressure it's called the compound gauge. You could use the high side for the suction but it's harder to read and it won't read negative pressure or vacuum. If you used the low side on the high side it would over pressure out of range and damage the gauge. Today digital probes use a sensor. It's the same sensor for each. In the app you select if it's mapped to hi or low pressure so the app can use the formulas to do the correct math for you.
Me personally, Im really not a fan of the Testo 550. I don't like how the temperature probes fit into the head. I did not like having to switch screens to see all the information I wanted. In direct comparison I ordered the SMAN 460 I find the micron guage, vacuum hose and 4 port manifold a waste of space and makes it bulky. A year ago I gave in and went with the Feilpice probes with the measurquick app. I love it, it is perfect. That's just my opinions, everybody has something they like different. As for the micron guage, I think the micron guage in the manifold is a bad idea. Too easily gets dirty, too close to the pump and too far from the system. I'm editing a video pulling a vacuum on the 4 port with the micron guage built in, with a second micron guage on the actual unit to compare. There was a big difference.
30 degree rule is no longer accurate. Old ac units and refregeration units but even refrigeration units are changing now. I have a video on this somewhere condensor TD I believe it's called.
So, by using the P-T Chart, once you have obtained the psig, on any gauge, you can convert any number. So the psig is the really important factor, or am i wrong? I used the National Gas app, whilst following your Tutorial, and works just dandy. Damm, i am starting to talk like an American. Won't use Fahrenheit though 😀
Does the PT chart include some kind of adjustment to accommodate the increase in pressure from superheating which is after the saturation phase inside the evaporator?
There are many variables that take into account the saturation% boiling pressure. The pressure will not change again after saturation. The tube can gain sensible heat above saturation but it's the same tube so its the same pressure. Just as oxygen bulls at -183F thays its saturation temperature at 0 psig (14.7 psia) the oxygen in my room is at 78F the oxygen is superheated 261 above its saturation temperature but still at 0 psig (14.7 psia) Superheat will be the vapor after saturation at the same pressure. Water boils at 212f at 0 psig 14.7psia less than that water will boil at a lower temperature. But if I lower the pressure
Ty. What could be causing to a system that I know it’s low on refrigerant . I add refrigerant but the low side reads 95 psig and the high side reads 180 psig . As I keep on adding refrigerant, the pressure on both sides are not moving anymore. It’s an R22 system with a piston.
Pressures mean nothing. How much CFM across the evaporator coil? What is the superheat and the target superheat What is your subcooling and what's the OD temperature.
This saved me! Im using the same pressure temperature chart and at first i was so lost but then i found your video and it helped so much!
Start the Learn HVAC playlist in sequential order here
ua-cam.com/play/PLc7QlzR-srBgknwzlXjoESxNbzHQJ-TIq.html
Hey, how to get the necessary hands-on experience for the HVAC industry totally free-of-cost and online?
Well those are 2 different things.
Free training is my playlist "learn HVAC"
Also skillcat has free stuff.
As for hands on, you need to be in person. Volunteer time at a company or het. Hired on as an apprentice. Repetition is learning.
@@love2hvac As I'm from a different part of the world, I can't be present there. Isn't there any way online for the training?
Hey Branaman! I've been watching your HVAC playlist and its amazing. I just wanted to ask what's the difference between psi rating on the left hand side of the digital gauge and the head pressure on the right hand side of the digital gauge.
They are both reading PSI gauge
The red represents the high side aka head pressure after the compressor to the metering device. Because it's a higher pressure the gauge goes to a higher number. This means it goes to a higher PSI gauge reading and can handle the higher pressure while the system is running. However with more numbers on the same size dial it's harder to read. Each mark may represent a 5 or 10 psi difference so it's harder to see exactly where the umber is. When it's converted to temperature it tells us where the refrigerant is condensing at outside.
The suction side will be a lower pressure from the metering device back to the compressor. Because it's lower pressure the guage does not need to read as high. This allows the reading to be more easily seen. Each mar may represent 2 or 3 psi. It's easier to see where the needle is pointing. It tells us where the refrigerant is boiling or evaporating at inside.
The blue suction gauge also called a compound gauge because it also reads negative pressure below 0 psig or better known as "hg or inches of mercury or vacuum. Because it measures positive and negative pressure it's called the compound gauge.
You could use the high side for the suction but it's harder to read and it won't read negative pressure or vacuum.
If you used the low side on the high side it would over pressure out of range and damage the gauge.
Today digital probes use a sensor. It's the same sensor for each. In the app you select if it's mapped to hi or low pressure so the app can use the formulas to do the correct math for you.
How do you like that testo 550? would you recommend it and how does it work for a micron gauge?
Me personally, Im really not a fan of the Testo 550. I don't like how the temperature probes fit into the head. I did not like having to switch screens to see all the information I wanted.
In direct comparison I ordered the SMAN 460 I find the micron guage, vacuum hose and 4 port manifold a waste of space and makes it bulky.
A year ago I gave in and went with the Feilpice probes with the measurquick app. I love it, it is perfect.
That's just my opinions, everybody has something they like different.
As for the micron guage, I think the micron guage in the manifold is a bad idea. Too easily gets dirty, too close to the pump and too far from the system.
I'm editing a video pulling a vacuum on the 4 port with the micron guage built in, with a second micron guage on the actual unit to compare. There was a big difference.
Great video!
I have a question . I know the 30 degree rule for head pressure but what is the correct way to know what your head pressure should be ?
30 degree rule is no longer accurate. Old ac units and refregeration units but even refrigeration units are changing now.
I have a video on this somewhere condensor TD I believe it's called.
So, by using the P-T Chart, once you have obtained the psig, on any gauge, you can convert any number.
So the psig is the really important factor, or am i wrong?
I used the National Gas app, whilst following your Tutorial, and works just dandy.
Damm, i am starting to talk like an American. Won't use Fahrenheit though 😀
The metric system is a much simpler system. Digital gauges are great because they do all tue conversion for you.
where I can buy quick valve showing at 12;43..for single digital gauge..with 1/8" NPT
www.grainger.com/product/3DXH1?ef_id=CjwKCAiAprGRBhBgEiwANJEY7NlWkdzAma8t7Zb5tJwxonqGPQ9T0m1AYklFhztz0WB6q9czgZLebRoCtoUQAvD_BwE:G:s&s_kwcid=AL!2966!3!284662588492!!!g!531027606407!&gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gclid=CjwKCAiAprGRBhBgEiwANJEY7NlWkdzAma8t7Zb5tJwxonqGPQ9T0m1AYklFhztz0WB6q9czgZLebRoCtoUQAvD_BwE&gclsrc=aw.ds
Quick Coupler, 1/8 in (F)NPT x 1/4 in Female, Brass Fitting
Does the PT chart include some kind of adjustment to accommodate the increase in pressure from superheating which is after the saturation phase inside the evaporator?
There are many variables that take into account the saturation% boiling pressure. The pressure will not change again after saturation. The tube can gain sensible heat above saturation but it's the same tube so its the same pressure.
Just as oxygen bulls at -183F thays its saturation temperature at 0 psig (14.7 psia) the oxygen in my room is at 78F the oxygen is superheated 261 above its saturation temperature but still at 0 psig (14.7 psia)
Superheat will be the vapor after saturation at the same pressure.
Water boils at 212f at 0 psig 14.7psia less than that water will boil at a lower temperature.
But if I lower the pressure
Thanks.
taking my hvac study course online and their pt chart explanation didn't make sense. Thanks
Ty. What could be causing to a system that I know it’s low on refrigerant . I add refrigerant but the low side reads 95 psig and the high side reads 180 psig . As I keep on adding refrigerant, the pressure on both sides are not moving anymore. It’s an R22 system with a piston.
Pressures mean nothing.
How much CFM across the evaporator coil?
What is the superheat and the target superheat
What is your subcooling and what's the OD temperature.
@@love2hvac I will check on those info when I get back to it. Thanks again Ty.
Thank you
Do a video explain how to use the Honeywell pt chart app
I will have on for Emerson PT pro coming soon.
Sir, how you know that 32 is the freezing point?
Water freezes at 32⁰F (0⁰c) and it boils at 212⁰F (100⁰c) at standard atmospheric conditions
@@love2hvac thanks a lot, enjoying your , very useful vedioes