HVACR: General Purpose Switching Relays EXPLAINED (How It Works) Everything You Need To Know! 903

HVACR: General Purpose Switching Relays EXPLAINED (How It Works) Everything You Need To Know
The MARS Series 903 switching relays are intended for many applications in air conditioning, refrigeration, and heating. Other uses include general purpose switching in appliances, fan controls, and vending machines. Our relays are available in 24, 110/120, and 208/240 coil voltages with various
combinations of power and pilot duty contacts.
903 series switching relay receives and controls electrical signals for general purpose applications. This switching relay has double pole double throw contacts and is suitable for use in heating, air conditioning and refrigeration applications, appliance vending machines, fan controls and business machines.
Relay switches (also called an electrical relay or an electrical relay switch) use a small amount of power to control a larger source of power connected to electrical devices such as car motors, computers, and lighting installations. A basic relay switch has a control circuit with an electromagnetic coil and a load circuit with contacts and a lever. When current flows into the relay switch, it moves through the coil and a magnetic field is created, which causes the lever in the load circuit to move between contacts, either turning the device on or off. In a normally open (NO) relay switch, when power is supplied to the relay, the load circuit is closed and the power source connected to the relay is turned on. In a normally closed (NC) relay switch, when power is supplied to the relay, the load circuit is open and the power source connected to the relay is turned off. In other types of relay switches, non-moving parts such as transistors or semiconductors can be used as the control circuit to operate the switching mechanism. Relay switches can be controlled with an external switch, such as a light switch, or they can be connected to an automatically switched power source, such as a car ignition. One relay can operate multiple switches, and multiple relays can be operated with a single switch, with each relay operating independently from the other relays in the system.
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[@kevinchristianson6723]

Wouldn't 6 be normally open and not closed?

[@izzybell11]

Interesting subject and well explained. Great job JMT.

[@JumpermanTech]

Thank you! Stay tuned for new videos every week 🔧⚡

[@user-ki3wo7me7u]

Thanks bro... I'm a new student to HVAC. and I'm struggling to understand the electrical component. Your explanation for this is so helpful .our tea her even shows us some of your videos as learning tools

[@weavercattlecompany]

You will definitely run into those on a fan control center along with a Honeywell fan/limit controller on older furnaces 😊

[@izzybell11]

Interesting subject and well explained. Great job JMT. Thanks for sharing. 👍

[@JumpermanTech]

Thank you! Stay tuned for new videos every week 🔧⚡

[@kareemkanaan8608]

So useful and good way to reach the information to the people. Thanks.

[@edilsonserafim4784]

great video well explained and also shows all the steps to troubleshooting

[@JumpermanTech]

Thank you! Glad you found this video helpful. Stay tuned for new videos every week 🔧⚡

[@jrh86]

Exeptional tutorial ❤

[@musclemoney4479]

Thank you, super informative, i appreciate it very much

[@alexeytech1495]

Well explained visual material.

[@LoganNees-es5ds]

Love your stuff

[@zekenzy6486]

Great Video. Thank you for sharing

[@toyinorodare4072]

Thank you for the videos. you are doing a great job

[@JumpermanTech]

You're very welcome & thank you! 🙏 Stay tuned for new videos every week 🔧⚡

[@Eddy63]

More good info ... Thx for posting ...

[@Ruby8881]

Great vid brother- thanks

[@bensybency]

Thank you sir for this wonderful video

[@jortega222]

Very good 👍

[@rrodgers3285]

Great video thank you

[@ILoveKittys78]

Amazing❤

[@christophernewman2824]

Thank you for the video I. Describing how the relay works. My question is what would go on the normally closed terminals?

[@mbkickboxer]

Quick question if you don't mind. My heating/cooling system has that relay for the blower. Heat, everything works fine. When we turn the AC on, every now and then the unit turns on but the blower doesn't because the really slightly pops out. I'll push it back in and it will work for hours, then randomly the unit will go on, but the relay has slightly popped out again. Lost with what to do.

[@localchumb]

thank you so much for the video sir, it's helped me so much! I just have one question though! I understand the theory of the relay and using continuity to test if the Normally Open or Normally Closed contacts are in their correct baseline state. What confuses me is, how do I test the relay while energized to see if the coil is working properly, therefore the contacts moving to the right places? Would that be checking for voltages? It's my understanding that I have to use Continuity while it's de-energized so I won't mess up my multi-meter. I hope you get a chance to read this :)

[@realSamAndrew]

The coil and upper contacts are energized separately, so you can still use continuity with the main circuits disconnected. If everything is powered, yes you would check voltage at each point where it is expected.

[@weavercattlecompany]

Good question. Never measure resistance while circuit is energized because an ohm meter measures resistance by putting a small voltage across what your testing. If the circuit is energized then you need to test for voltage instead. If you're testing a switch, relay contacts, etc. and they are OPEN then you will basically be measuring the supply voltage. If you're testing a switch, relay contacts, etc. and they are CLOSED then you will be measuring no voltage. Basically, when the path is closed you lose your common/neutral reference hence the zero reading. In a sense, it's like trying to read the voltage across a DC battery by connecting both probes to the positive or negative (no potential difference means no voltage reading). Hopefully that answers your question 😊

[@wesvann5099]

If this type of relay (R8222D 1014) is replacing one (R8222D 1006) that only has two contacts for the coil, can the extra set be removed? Or is it okay to just have them outside of the receptacle? Thanks!

[@saupham8192]

Gas furnace and air conditioner are shared with one relay or different? My unit was installed in 1973 and still works .Thanks

[@bobbyburt3636]

Does amp matter on a relay?

[@jaym48]

I checked my Honeywell R8222B 1067 24V 50/60 Hz per your protocol: the points have an 11.5 Ohms reading and the relay is opened and when the circuit calls on it, it closes per my resistance readings. My points, where my 11.5 Ohms reading was shows zero voltage when the power is off and jumps to 28 volts when the power is on....which is good. My question to you is should the relay side, when the circuit closes also show the 28 volts? Currently, when I activate the relay the closed reading does not show any volts. Does this mean I need a new relay switch?

[@JumpermanTech]

Only the coil will read 28 volts across once it is energized. As far as your N.O. or N.C. contacts, you will read 0 volts across the contacts if the contacts close meaning voltage is passing through and is good and you will read 28 volts or so across once the contacts open which is also good. This happens only when the coil is energized. Once enrgized, the NO contacts will close and the NC contacts will open. Watch the video a few times to get a better grasp. Hope this helps & thanks for watching!

[@jaym48]

@@JumpermanTech correct...my coil shows zero volts and once the furnace is activated the common/HUM wires to the Honeywell R8222B 1067 reads 28 volts across the coil; however, the output side, that leads to my humidifier & humidstat reads zero volts if opened or closed (on the N.O. or N.C).....I assume it is bad, yes?

[@jrh86]

I believe this rellay to be the most common on planet earth 😂

[@oscarguevara1237]

Great content! You’re a hero 🫡