HOW HIGH AND LOW PRESSURE SAFETY SWITCHES OF A HVAC/ AC SYSTEM WORKS
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- เผยแพร่เมื่อ 5 ก.ย. 2024
- How high and low pressure safety works and wired in a HVAC system .. how to install them • HVAC HACKS REPLACING B... #d2dnyac #hvac
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This videos is very informative, I do residential so troubleshooting high and low switches would be awesome!!
Keep up the good work my man!!
At 55psi the circuit will closed and at 30 psi the circuit will open to protect the compressor, due to the low pressure.
Untuk saklar tekanan tinggi berapa range tekanannya?
Instead of Removing wire if you switch off condenser fan high pressure going increase then safety switch work perfectly..in same way if you can close high pressure line value then you get low pressure in that way u can check in real time your low pressure switch work perfectly.. this is how we do ..
This is my opinion only ..u are doing great work..
Thanks for stopping by, please check my other video on this subject!
You'll have a million subscribers in no time. Keep it up !
Very professional video. I love the way you explained step-by-step, you make it easy to understand better. Thanks Will B
Thank you for stopping by
Thank you so much. You dont understand how perfect and a godsend your channel is right now!!!!!
Hard to find information TH-cam about this switch. Thank you for information
The switch is simply based on the type of refrigerant inside the system
this could have been a 30 second video but very informative
Thanks for stopping by
Ya Mon you are a great tech.
Excellent explanation bro!
Bless!!!!
Thank you for stopping by
GOOD MORNING FROM CHICAGO THANK YOU SO MUCH
What’s up Chicago , are you guys busy yet?
That was an awesome explanation..I had and RTU that was having pressure switch problem and thanks to this awesome video I was able to pinpoint the issue..Thanks man 👍👍
I loved the video, it was difficult to find information about this security module and this video is very complete. Greetings engineer 👍🏿
Good vid bro👍 but waving that highly conductive watch next to those high voltage contactors 😅 had me on edge
Good information my question is how do you replace a high or low pressure switch without losing your refrigerant charge came across this problem.
You add a swivel tee
Can you please do a video on a sequence of operation for bigger units, like 10, 20 tons please. I'm a new tech trying to learn . I have subscribed to your channel hoping to gain knowledge. Great channel by the way. Thx to TH-cam algorithm who suggested your video.
All the control circuit is 240V in my AC unit. I'd certainly be taking more care with those connectors an that scenario as they're going to bite a compared to a 24V control circuit.
Agreed
I want to know how a low and high pressure switch is been connected. Thanks
I have a video uploaded already check it out
Great video really simplified .
Nic sharing knowledgeable we should never bypass anyone of them
In the case of , you come across a bad low pressure switch and don’t have any low pressure switches on hand ,but the unit needs to go up. How do you jump out the switch ? until you go and get a switch
Shunt or splice together the 2 wires leaving the switch
Thanks!
Can you tie the hi pressure switch if not one avaliable in a tight spot, sort of like emergency situations
Can I do what ?
thanks!
Thanks for watching
Yes sir I need thorough expl
Thank you!
Thanks for stopping by
Sir please make vedio on career package Ac using two compressors and the wiring diagram for the lock out relay wiring . Please explain how it's wired and how it works.
Hello friend Do you want to know how the lockout relay works and wired?
@@D2DNYAC yes sir I need a vedio thoroughly explaining how the lock out circuit works employing two compressors and two lockout relay for two circuits. I am asking you from Bahrain Another vedio on Big career split Ac indoor unit staring with DOL starter wiring diagram. Please I hope you help sir.
Perblam E2 model SERVICE FIRST Trance Rooftop SENO 1577 et low pression=1bar open
What are you saying?
@@D2DNYAC perblam E2
What switches are you using andd where are you getting them?
The switch pressure cut in and cut out rating depends on the refrigerant
Refrigeration or hvac supply house or shops or on the internet
Can you please make a video on understanding pressures?
Sure thing stay tuned for that
Hello sir! Can you make a video searching for leaks in the system? Like the problem is that the unit is not cooling although it's operating?
Thank you very much!
Okay
@@D2DNYACi have a lennox xp13 system and my green light is blinking showing high pressure fault...my compressor is not coming on and the switch had automatic reset but dint think its resetting...what can i do to reset it
Please Please Please D2D NY … Can you Explain ( What is Restriction T.X.V valve) to Troubleshooting
The TXV creates a controlled pressure difference between the high and low side of your refrigeration system as refrigerant flows through it, when the TXV is restricted that pressure drop becomes uncontrollable thus starving your low side/evaporator of refrigerant Symptoms is low back pressures, most times high head pressure, high suction line temperatures/ super heat, high supply air temperature, poor cooling. Solution replace the valve
Can you please shown the video how to troubleshooting The TXV valve restriction
Okay stay tuned
Hi there!
I have a problem with my Package Unit, the Diagnostic Codes for Defrost control Leds is telling me "HIGH PRESSURE SWITCH LOCKOUT" ...
Are you a hvac technician?
So high pressure switch is pressure is fine the switch remains closed once pressure gets to high switch opens??
👍 yes
@@D2DNYACis there a way to measure if the high pressure switch is open on a automatic switch
Thanks for the video =)
Thank you for stopping by
Question: When does the high-pressure sensor disconnect the gas 22
350 to 410 psig depending on the switch
I have a code 35 error which means a low pressure switch or sensor error. My system doesn’t have a leak though. Is there a way to bypass this faulty switch or sensor?
What system?
@@D2DNYAC it's an LG mini split
Pls i want to know how each of the switches were connected to the system
the switches are connected in series most of the time!
Do you know how trane 2 stage packagw unit compressor lockout works ? Apparently I had low pressure got power going in and out however high pressure switch and discharge line snap disk switch didn't have power during compressor lock out.
Get me the model number and I can tell you
Is it possible to replace the high pressure switch into one that can be adjustable
Yes
@@D2DNYAC thank you so much
I have the same system in my building. So one of my compressor has water inside I had a technician came over telling me that we need to replace a compressor when they come with the new . They told me the heat exchanger has internal leak in there. I just want to know if that’s true
Doesn't add up !
The pressure switches are running through the coil right? It’s a 24v - 240v switch right? Please explain how you hooked up the wiring for the switch. How does it interrupt the contractor?
I will do another video upload this week on that look out for it
Will the condenser fan still run if the pressure swith trips?
In some cases yes especially carrier RTU units
I have a lennox 13acx-036-230 13. The entire unit runs and turns on, but it blows hot. Im thinking low refrigerant?
Thanks 👍
Thank you for stopping by
I just checked for continuity in both my switches. One of them showing there is continuity and the other one showing 400 ohms of resistance. What does that mean? I’m also not getting 24V at the side legs of the contractor, but I am getting the 24V coming from the thermostat.
Replace the switch with the 400 ohs of resistance I would start there!
How to change oil scroll compresor in tandem sytem.? Thanks a lot.
The easiest way would be to use the oil ports or connecting oil equalizer lines to drain the oils and then refill it through the oil or suction service ports.
@@D2DNYAC Do you have the video..? I wanna see it.Thank you so much.
Thanks..
I want to know what capacitor and transformer does?
Transformer lower the incoming line voltage to control voltage 460/208/120 volts to 24 volts, capacitor is used on single pashas motors/ compressors to increase starting and running power
Good job bro thx
Thanks for stopping by
I wanna know more about the time delay.
Okay I will do a video on it or incorporate it into another video. Stay tuned for that
Thanks bro
Thanks for stopping by
What should i do if there is no manual reset on pressure switch
Nothing this means the switch will automatically reset once the pressures come down
@D2DNYAC how do you get the pressure to come down
How do you know if the pressure sensor is broken or working?
They are typically normally closed switches, when system pressure is good, and opened if faulty or if system has a problem
@@D2DNYAC Under normal circumstances, is there electricity at one corner or both corners?
Question: could I bypass the pressure switch, charge the system, and just leave it jump?
Sure, however that’s dangerous to anyone who operates this system and to the system it self, so please don’t
@@D2DNYAC why would it be dangerous to one that operates...are there system s that don't have pressure switchs
Because if your system does pull a high head pressure or a very low suction pressure the system wont shut off and it will ruin your compressor. Only bypass it if its temporary and you are coming back to fix it later. Dont leave it bypassed.
It’s not dangerous to one that operates however if you bypass the high pressure switch you can definitely ruin your compressor bypassing the low pressure switch isn’t too bad however you can still ruin your compressor if the system freezes up and slug liquid refrigerant back to compressor. If you must only do it during troubleshooting or in an emergency if the switch or switches is faulty and system pressures are okay. And return and remedy ASAP.
How to by pass high pressure switch?
Don’t recommend this unless you are troubleshooting!
Don’t recommend unless troubleshooting , however you can bypass by cutting both wires connected to the switch, then strip and connect both wire going back into the controls together
But the pressure switch has three wires... 😭
I wanna know more about the time delay
Sir i have some issue i instaled compresor nd i try to charge freon but compresor are trip by low pressor switch plss tell me some way to charge freon
What you should do is place the Freon tank in a bucket of hot water or use a heat gun/ blower to warm up the tank this will allow charging while compressor is off best practice.
Hello I'm having problems with a stand up hvac. I didn't open the door on the back for the fans for the condenser to blow out and it shut the unit down. The reading are at 100psi on the blue side of my gauge.Is there any way to get the presure back down so the hbac can come back on.
Not enough information here for me to advise you!
What manufacturer? What’s the issue or exact problem?
Brother I need help, my ax unite has a bad high pressure switch how can I replace it and where I can buy it I really need a little help
Where are you located ?
@@D2DNYAC Arizona
Hvac supply store, don't know what's in Arizona!
You will need to know what refrigerant system uses and you can purchase a swivel tee as well and follow my method
My compressor won't run, won't make a noise. wondering about pressure switches. But, condenser fan does run, thus contactor working. If my logic is right, per your video, my pressure switches must be ok. worth noting I have a defrost board could that matter. thanks.
@Tserevenad if you have a residential split system and the fan on top of the outdoor unit spins, and compressor doesn’t run it seems like your compressor is bad!
In this case for 1PH units a hard start kit my help!
@@D2DNYAC yes I have a stains you describe. I used my ohmmeter to check coil winding. Shorts to ground and a stuck overload switch. Everything perfect. Can compressor be bad if electrical tests are good. Doesn’t blow fuses either. Also cap and contractor measure/working properly. I am thinking something going on with defrost board and sensor but not clear on why it would make compressor not run. Thanks for your thoughts.
Then if this is the case typically the fan and compressor shares the same contactor the compressor 1PH compressor is seized, try using a hard start kit /capacitor sometimes this will get compressor going, you can also send me a picture of your ac unit and wiring diagram on (what’s app) so I can better assist!
@@D2DNYAC appreciate your help. I just reread my last text and it is nonsense so I need to give you correct info. I need to setup WhatsApp on my phone and reach out to you again this afternoon. Thanks.
What is the purpose of contactor sir?
@ abet lakwatsero It is an electronic switch which is controlled by your thermostat , the thermostat passed low or controlled voltage usually 24V to the contactor coil then the switching section of contactor then pass high voltage to the load compressors and fan motors to put it simply, it can get more complex
@@D2DNYAC Thank you for information sir God Bless
Is the high pressure switch the same as the high pressure control
No!
@@D2DNYAC ok so if you don't mind me asking what is the high pressure control thank you?
😂 a device that controls the head pressure.
There is various types I have a video on type of head pressure control device! I will link it below👇🏻👇🏻👇🏻video
HEAD PRESSURE CONTROL VALVE / HPCV/ HEAD MASTER HOW TO INSTALL & WHAT IS IT?
In my video title above is one type of head pressure control device. Examples of others are Variable frequency drives, fan cycling switches, motorized dampers, motorized valves
Can I call you for service? I’m in queens NY
Sure thing
Acapulco
English
Do you respond to questions?
Always
What’s yours?
Big up
Thank you so much
bad camera angle
What didn't you not see ?
Worked in refineries and chemical plants most of my life, you're not allowed to wear watches or rings of any kind or Jewelry period . Doesn't matter your rank or craft. Those Blue Gloves and grabbing HOT WIRES are going to get this guy killed. Yes I am an expert, Senior V.P. Engineering (retired). Couldn't get past the safety issues here to watch the video for content. Had he been one of my employees he would have been suspended until he attended required safety classes.
Hey 👋 thanks for stopping by! 🤔l understand and knows all the risks involved with the job however things are different inside of a plant that’s a controlled environment out here in HVAC you are going to have to troubleshoot live circuits and I have yet to see anyone got suited up to do so., I am a pro and knows and understand what I am doing and I can assure you after 17 yrs in the industry I will not be killed by the HVAC trade craft🤫😂
Jamaican.
💯🇯🇲
My A/C works but the won't switch over to blow out heat? What could be the issue? We had someone come change out our pressure switch and The heater went out... any tips or advice you can give me ? I'd appreciate it
In the case of a heat pump it’s either the thermostat configuration/wiring or a bad reversing valve in the case of other heating systems type pressure switch on AC would have no impact on heating
Sir please language in Hindi use
Thanks for watching
Acapulco
English please