HVAC 076 Pressure Switch Refrigerant
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- Опубликовано: 7 фев 2025
- My friend Craig with AC service tech llc. also has a great video on Pressure switches.
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Rookie field assistant in commercial refrigeration here. I changed careers at 36 years old This is legit educational material. I've come to find that whenever you drop a video I'm about to learn something. I really appreciate your effort to put this kind of stuff out here.
My dude you are me lmao literally 36, 15 years oilfield experience... currently in Commercial Maintenance working my way to service. 🤘
I was a patrol cop for 10 years. This last year convinced me it was time to get out. I think this career is where it's at. They are PMing me to death, but I am learning as fast as I can trying to get in to service.
PM's are a great way to learn. You get comfortable seeing a variety of equipment, people, curcumstances, and conditions.
If your really wanting to move to service faster, volunteer to go with the service guys km after houer calls and weekend calls. That will strengthen your skills and build the confidence in the service team. It also shows the boss your committed and not afraid of on call.
Thank you for the video. I left 40 years ago. You brought a lot of good memories too much people but we loved it. Thanks.
Great info, Thanks!
Thank you very much!!!!!
Excellent video great job, wish I saw this 6 months ago
Very nice explained. Thanks for your videos. I’m looking forward for a HVAC/air handle electrical video
Nice, great tutorial. I also prefer to use tubing wrenches whenever possible.
Yes that is/the best!
Thank you for this video.
Love from Nigeria
I had a bad high pressure switch on my heat pump a couple months ago. It wasn't opening, but rather had a resistance that increased when it was running during the day. It would run and cool starting at sunset. Condenser doesn't get a lot of direct sun but does toward sunset. Got misdiagnosed as a bad defrost board by the tech as we both missed that the LED code on the schematic was for the comfort alert while the defrost board code was a tiny label on the opposite corner. The board LED code was for HP lock out. I thought it out, tested the HP switch and found the weird resistance issue. Jumped it out and checked the switch over several hours/days and it never opened when running. Instead it went from 9 ohms in the AM to 26 ohms with in minutes of startup and locked out. Called the HVAC company to recommend the fix was the HP switch and when a different tech came out he brought the board and HP switch, verified what I found and changed the switch. He never found any high pressure refrigerant condition.
Sounds like moisture got into the switch.
@@love2hvac That does remind me that there was a hairline crack found in the old sensor.
❤m
As wg
Very knowledgeable Great job!
How would I wire it if the unit don’t have one, however adding a swivel T with low pressure switch .
So is this the only way to tell if it has a schrader, to call the manufacturer? 5 years into the trade, found two leaks on a head pressure switch this year. Able to remove the first and apply thread sealant. The other was a trane RTU and quickly found out it didn’t have a schrader… thankfully was able to mitigate things but obviously would like that avoid situations like that in the future.
I have not figured a way out without checking with the manufacture
I really want to know how to correctly drill a hole into a new pipe for brazing in a pressure switch. Can you use a regular drill? Any videos showing such a procedure?
I like to use my torch and melt a hole in it. If I use a drill bit I like to put nitrogen pressure behind it so the shaving are pushed out of the pipe as I'm drilling. Shaving from the drill can cause problems in the unit.
I will be doing a brazing class eventually but I'm not close to that yet.
Awesome video, thanks for sharing. Question: the measurement from copper stick, is it 1/4 on the pressure switch with the yellow wires? thanks.
Thank you!
Thank u for this,class on pressure switches.could u give us information on how to set them up on different pressures.
Once I get the refrigeration I will but that's a ways away.
About the brazing on pressure switch all the way stuck inside I would normally cut about 3/4 vertically so I Dose not crates almost no restriction. The 3/4 cut will be inside the pipes all clean up of copper files. And the 1/4 extras will be my guide Deep.
Thank you
VERY GOOD INFO
Good video! One question: do the thermo type switches work as good as the pressure switches? Thanks
Different jobs protecting different things.
Thermo switch is needed to protect the discharge line thermostat from exceeding 225 and oil breakdown.
You can have a hot discharge line without high pressure so a HP switch is also needed.
Neither of those protect from Low pressure. So a LP switch protects the compressor too
Can you tell me if a mirage 220v inverter life12 has a low pressure switch
Informative 👍
How do you determine a HPS and LPS?
which wire is the common, and which is the voltage wire
very good
Do you have a video on delay swiches ?
Another lesson learned. Thank you👍.
Q- If you check the electrical state ( open/closed) of the pressure switch with the system off (equalized), is it safe to say that is what the “at rest” position is supposed to be in ??
Residential safeties Normally Closed.
High side opens on pressure rise
Aka closes on pressure drop.
Low side opens on pressure drop
Aka closes on pressure rise.
Now commercial is a different set of rules especially with automatic pump down.
@@love2hvac Great, thanks for the reply👍
Is that restricted could change the state of refrigerant from vapor to a liquid? Thanks Ty.
If it was on the liquid line it could
A: work as a metering device and you would feel the temperature difference.
B It would also cause the pressure before it to be very high and the pressure after it to be too low.
Do you have a video on the thread types encountered in HVAC work?
I do not. That's a really good ideal.
I wonder if you can elaborate on the tee (or provide a link). Tee female has a depressor and I assume that both males have a schrader valvle. I am finding a few but can't confirm 2 schraders.
Yes this is correct. Some. Come. With the valve core and some some do not, however, in my personal experience they have all been threaded to accept one.
Tru tech tools has some
I know people hate them but would a bullet piercing valve work to put high pressure valve on in a sealed system?
No, those are for temporary use such as recovery of a system with no ports. They will absolutely leak.
@@love2hvac but for temporary until I can afford to fix it correctly?
It seems like you have made up your mind and are looking for validation.
Just go for it. Worst thing is it will leak refrigerant out and burn up the compressor. Best case it leaks slowly enough to keep recharging it and the HP switch saves the unit from a dirty condensor or a failed fan motor.
@love2hvac not looking for validation at all. I'm fighting cancer living in my RV and the heat is making me sick. If I can make something work to finish out the summer I can have it done right before next summer. I would have to put something like that in to evacuate the system then braze in an actual service port and a Schrader valve for a replaceable high pressure switch
Then leave it like it is!
There is no reason to risk the integrity of the system to add an optional protection device (hp switch) at the risk if a part known to 100% cause much bigger and costly problems .
Leave the system like it is and run it.
Piercing valves are NOT to be left in the system under any circumstances. They are a temporary tool used to recover refrigerant. These will absolutely leak Refregerant out causing much bigger problems and there is absolutely no circumstance for them to be left in place in an operating system.
However it's a free world and you are welcome to damage your equipment however you choose.
If your up tight about wrench type use an actual line wrench. Great vid tho, ThankYou!
Tt I can't find your videos for electrical
I still have not started those yet
What is the name of your t port of pressure switch
I am. Searching that but a dont know. The name. Plss help me than you
trutechtools.com/jb-a31851-swivel-flare-tee-with-depressor.html
Why wouldn’t they all have Schrader valve core and be able to be replaced easily.
I will check first pressure switch its easy with a multimeter and then find the cause
👍👍👍
Bp=1bar and open
🥃🍺🍺🍺🥃🏌🏻♀️👍🏻
Perblam E2 model SERVICE FIRST Trance Rooftop SENO 1577 et Base pression open
manufactures who don't design their systems with pressure switches that screw onto schrader valves SUCK! plain and simple. i just spent $600 to have a low pressure switch replaced on my 2.5 year old amana ASX16042 ac unit. the tech installed a new nipple with a schrader valve. pisses me off that all AC manufactures don't install schrader valves.
Your videos are awesome but I would suggest using adjustable wrenches properly. I noticed you have them reversed in the video. The tip of the lower or adjustable jaw should always point in the direction you are turning. ruclips.net/video/KHKFy0J75Mo/видео.html
Thank you Sir.