HVAC Relays 101 3D
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- เผยแพร่เมื่อ 10 มิ.ย. 2024
- This 3D animation will go through the 101 of of relays in HVAC systems, exploring key components like the coil and contacts, as well as how relays work and why we use them. This 3D video also covers components that are similar to relays.
Relays are electrically operated switches that generally allow a lower-voltage control circuit to control higher-current circuits to help turn things on and off safely. The main component of a relay is a coil or electromagnet, and there is also a series of electrical contacts. When current passes through the coil, it generates a magnetic field that moves a metal armature, opening or closing the attached contacts (also known as switches or contact points). These contacts allow or disrupt the flow of electricity, depending on whether they're closed or open, respectively. These contacts may be normally open (NO) and close when the coil is energized or normally closed (NC), which open when energized. Relays provide isolation between the control circuit and the circuit being controlled. That is why we can control 240v components with much safer 24v controls in residential HVAC systems.
We must pay attention to the coil or control voltage rating, contact voltage, and amperage ratings to make sure we have the right relay for the application.
Two common relay types we see in HVAC include 90-340 and ice cube relays. 90-340 relays are double-pole, double-throw (DPDT) relays with two sets of contacts (one NO and one NC in isolated rows, making them "dry contacts") and eight terminals; they are multi-purpose relays that can control components that draw less than 15 amps, like fan motors. The coil pulls the switch contacts to change the states of the contacts. Ice cube relays have a clear casing, a coil, an armature, and contacts.
Some controls that function like a relay include contactors, which have contact points and can handle current up to 40 amps and often control compressors; their contacts are normally open and close upon energizing. Motor starters are like large contactors that come with an overload and are designed for starting and stopping motors, providing control and overload protection.
MOSFETs also work similarly to relays, but they have different components and switch electronically rather than physically, and their three components are the gate, drain, and source. Stack sequencers use physical components to control sequences in electrical heaters and fans; they consist of a heater and a bi-metallic disc for on/off delays.
You can test many of these controls for continuity with a multimeter.
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Totally awesome graphics! Makes everything very clear!
As a green tech on his 2nd year on the field, I have learn so much from this channel. I really appreciated the instructor and the person that does the 3d views. Thank you guys
Keep this style of video up!
Outstanding presentation! Thanks Bryan and HVACR School
Super amazing video! Something I thought was interesting was stack sequencers and that they control electric heaters and fans.
videos are getting better and better. keep up the good work
U just get me as a new follower . Thank you
relays and wiring diagrams... finally my two faults in one video! TY!!
Great video my brother
This is great content. Thanks, Bryan!
Perfect video!!!
Game changing for new techs, thank you!!
Marvelous presentation 👏👏👏👏
Great video, thanks so much!
very cool, nice presentation and music too
Perfect video. Thank you
Great demonstration. 👍🏻
Awesome graphics and info!
Exelent Animation & vídeo, tks, 🎩
Awesome training, from an awesome operation! I retired a couple years ago from the military, and now am part owner of an HVAC company in Austin, Tx. I watch all your videos on how to be a great HVAC company! You are a pro! And great trainer! Super professional!
Great job and video.
This is great content, I'm gaining lots of knowledge.
Thank you very much, I highly appreciate it, God multiple your businesses.
3d are so goated!
Great video
Make more of these please
Thank you
Wow! Subscripting. Great production values.
Much appreciated!
I really like the 3d videos
I wish you are my instructor, man. While some one does not show me shuch good instructing.
Simplifies the explanation without a doubt, Im more of a real life type of guy , where you apply theory to real life situations .
Overloads relays next please!!!
🎉🎉
So if a relay is basically a switch and I had a spare relay laying around, could I install it on my Glock? Or would a relay make my Glock illegal?
Ask the ATF 😂🤣😂🤣
Probably makes it a rifle some how
The old 1800’s technology 😂 If the public understood just how easy electricity (as we utilize it) is, ya’ll be unemployed.
The information is free and out there for anyone to see. It’s not even that hard if you’re somewhat mechanically inclined to fix simple resi HVAC problems. I tell customers all the time it’s not worth buying a thermostat from me and how to replace their own.
The issue going forward is going to be communicating systems, solid state controls, DDC, etc. Most of the time it’s just “replace the board” but … which board haha - especially when the board costs $750
Combustion engines also started in the 1800s, look how little has changed there and yet somehow people still need mechanics?! I'd love to see your homemade relays for your homemade HVAC system.
Electricity is easy, refrigeration gas and pressures are FM.
Calculus is 300+ years old.
Don’t hold your breath on “the public” becoming mechanics in a field that is becoming more complicated by the day.
Cant be a master at everything
Very helpful
Great video