HVAC relays

[njnolan1]

Thanks for showing an actual demonstration on would happen!

[DrZarkloff]

@njnolan1 Thanks for watching.

[abady862]

thanks so much and we hope to learn more from

[ruizfamilia]

i really appreciate your videos..im in school for HVAC/R and you help me to understand many things without actually being on the field to experience them so thanks alot bro your the man!!

[DrZarkloff]

@ruizfamilia Thanks for watching.

[TheSuperClaude]

DrZarkloff, Can you please do a video on how to troubleshoot faulty relays? Thanks !

[HackerGuitarist]

I take it the 24v is dc ....while the others are ac (obviously)?

[moml2u2]

Thank you DrZakloff , it is really help full, I am wasting long time in books, put this small videos for HVAC make it very easy for me to get all the concept.

[DrZarkloff]

@moml2u2 Thanks. I'm glad to have been of service.

[mrfrancois3]

how you test them doc???



[DrZarkloff]

@mrfrancois3 Thanks. I guess that will have to be in another video.

[mrfrancois3]

how you test them doc???

[mirzamuneeb]

cool

[mirzamuneeb]

cool



[bobbyton80]

Nice video Dr. ... gotta tell ya i made that mistake rushing to get out of a job at an ice cream store and not paying attention to what i was doing. it was really fun when the fire department showed up.

[GHOKO1234]

DR Z.... can i use a 240V or 120v coil as replacement for a 24V coil?? would it cause any problems in the long run????

[DrZarkloff]

@GHOKO1234 Unless you are deciding to do some control reconfiguring, I suggest that you replace the coil with the same voltage as what you're using now.

[GHOKO1234]

DR Z.... can i use a 240V or 120v coil as replacement for a 24V coil?? would it cause any problems in the long run????

[GHOKO1234]

DR Z.... can i use a 120v coil as replacement for a 24V coil?? would it cause any problems in the long run???? thanks!!!!!

[GHOKO1234]

DR Z.. can i used a 120V coil in a 24v coil???? want would happen if i do? thanks!!!!

[DrZarkloff]

@GHOKO1234 You'll probably fry a control board.

[bluedodge14]

You did bring up a good point Dr Z about seeing these relays in larger commercial systems, I had to replace two of these relays this past week on a steam boiler. I used one of them to power a honeywell S86U ignition control board from a 24v circuit after the LWCO system on a call for steam. They work nice and come in handy!

[DrZarkloff]

@bluedodge14 Thanks. A lot of the residential techs out there might not have had to use these relays.

[hvacpro1]

Lol, sweet... Thnx Doc



[DrZarkloff]

@hvacpro1 Thanks for watching.

[DrZarkloff]

@hvacpro1 Thanks

[integdrd]

Real good practical application...I like it Good job Thanks DRC

[DrZarkloff]

@integdrd Thanks

[DrZarkloff]

@DrZarkloff Thank you for watching.

[DrZarkloff]

@integdrd Thanks

[tstatech]

Great video. I was thinking about coil voltage to with all the recent relay videos.

[DrZarkloff]

@tstatech I knew that I had to cover it sooner or later.

[fritzhvac]

@achzdck That gets a BIG He!! Yea Brother !!!

Man thats exactly what its all about !!!

Rock n Roll my friend !!!

[mikerochesterny]

These controls we don't see much up here in NY Rheem units use computer boards from inside which close the contactor. Alot of the newer systems like the Rheem Contour and Honeywell's adaptive intelligent recovery programing changes when you may or may not see 24volts at a power consuming device at a call for heat/cooling. also important to pay close attention to coil ratings when power is being converted to DC through a Mother board for a blower motor with intelligent variable drive.

[DrZarkloff]

@mikerochesterny You'll see these relays used in commercial systems.

[Nutintoitbut2doit]

Amen Dr.Z lol I have done that my self lol got in a rush and pulled out a relay installed a new one and as soon as I powered it back up pop, the old one was a 230 volt and I installed a 24 volt lol, and I have been doing this for sometime now lol.

[DrZarkloff]

@Nutintoitbut2doit I've made the same mistake, too.

[THEtechknight]

you smoked a good relay. boooooo. those things arnt cheap. 

[DrZarkloff]

@THEtechknight That's okay. It was an oldie.

[Tyrone7994]

Good information. Paying attention to detail can save you from problems.

[DrZarkloff]

@Tyrone7994 Thanks for watching.

[rbu2m]

What is the job for the relay and how do they work?

[DrZarkloff]

@rbu2m These relays are usually used to energize fan motors in newer residential systems. They're used in just about all commercial systems as slave relays.

[dav1099]

Oh Oh you let the smoke out! I'll only charge ya $70.00 per hr to put the smoke back in. lol

good video Dr. Z.

[DrZarkloff]

@dav1099 Thanks. I always wanted to do that.

[DrZarkloff]

@dav1099 lol

[MrSiskabob]

we learned about those in class this week

[DrZarkloff]

@MrSiskabob Did the instructor let the smoke out? lol

[MrSiskabob]

@DrZarkloff he did not catch one on fire like you did we just learned about them

[kck741]

Haha that's something one of the techs at my work would do.and then he would say well why is on my truck its not my fault I'm stupid

[DrZarkloff]

@kck741 lol

[fritzhvac]

Hey Dr.Z !!!

On the 120 volt coil , does the relay operate 120 applied line voltage , between 1 and 2 and 1and 3 to open and close ?

Thank You so much for taking the time to shot this my friend !!!

P.S. I bet Grandma tore you a new !!! Rofl ...

[DrZarkloff]

@fritzhvac Yes, the 120 volt coil energizes when 120 volts of line voltage is applied. Also, the 240 volt coils energize when 240 volts of line voltage is applied.

[fritzhvac]

@DrZarkloff Thank You, I understand what ever coil voltage the coil requires has to be applied to the coil itself .

What I am getting at is in my video where my coil required 24 volts to energize, I was able to operate two 120 volt appliances by applying a common to number one terminal and either hot to two term or three term to energize or denergize appliances . Can you operate 24 appliance on a 120v coil if you have 24 volts common applied to term one or term three to energize or denergize ?

[hvactecster79]

@fritzhvac 120vac power wire to 1, continues thru NC 2 to power vent. When 24vac is applied to coil from t-stat, NC 2 opens shutting power vent off and NO 3 closes and 120vac continues thru 3 to furnace.

When coil is de-energized, 3 opens again (furnace off), 2 closes (power vent on). Coil voltage matches coil rating. Line voltage can be up to what is listed on relay. You can have 120vac to that coil to energize and close 3 and have 24vac to 1 and continue thru 3 to load.

[fritzhvac]

@hvactecster79 Thank You Brett ! Thank You to Dr.Z !

My terminology , on relays is not the best . I believe I may have unknowingly confused the good Dr. with my question . I did go to Fern Creek High ! ROFL .Just kiddin it's a great skoole ! LOL

Yes sir that is what I was gettin at, Line Voltage on contact side !

So what you are saying my friend , is I can apply any voltage to contact side , as long as I don't exceed rating,so 24 is NO Problem ! Brett you made this very understandable ...

[hvactecster79]

@hvactecster79 Just to clarify. You can have 120vac to that coil IF it is a 120vac coil. Coil voltage must be as rated. Then the contact circuits can be ANY voltage up to the rated voltage of the relay.

[V8Jagnut]

yay Dr.Z let the smoke out of something. :D

[DrZarkloff]

@V8Jagnut Thanks. That was fun.

[V8Jagnut]

@DrZarkloff lol you should try microwaving something like a light bulb one day :D

[DrZarkloff]

@V8Jagnut That does sound like a lot of fun. lol

[DrZarkloff]

@V8Jagnut Thanks. I always wanted to do that.

[67tr876]

Nice just go's to show you need to read cant just say o this will work if you need a job done fast.

[DrZarkloff]

@67tr876 That's for sure. Using the wrong relay can be hazardous to the equipment.

[DrZarkloff]

@67tr876 That's for sure.

[Aussie50]

great video!, the same applies to Australian systems, although I have never seen a 110/125V coil. we just have 24V, 240V, and 415V

lol yeah don;t try it at home, leave me to let the smoke out of relay coils :D, and reversing valve coils :D

[DrZarkloff]

@Aussie50 Cool. I need to let the smoke out of a reversing valve coil. lol

[RockinGuy1994]

Thanks for the info Dr. I'll remember this.

[DrZarkloff]

@RockinGuy1994 Thanks for watching.

[mechanicwarrior20]

good video.

[DrZarkloff]

@mechanicwarrior20 Thanks.

[translatebubble]

If the sticker is missing, can you test it somehow to get the volt-value?

[DrZarkloff]

@translatebubble Yes. I'll make the next video showing how to ohm the coil.

[AMD1]

awesome. I have a hand full of 18vdc icecubes, I wonder what they would look like on my 220 dryer circuit.

[DrZarkloff]

@AMD1 They look really cool when they smoke up.

[mikefixac]

Thank you Good Doctor. Basic stuff, but if you don't know, you don't know. Of course I've never made a mistake like that. No, I'm perfect. All the other guys are hacks.

[DrZarkloff]

@mikefixac lol

[pianomaestrostudio]

Hi Dr. Z,

Some time ago, you make a great video on installation on a honeywell UV light system. I have installed 4 of those units and can't seem to find the replacement bulb!

I contacted Johnstone and they say that on that particular unit there has been a recall, and no llonger carry this unit, therefore non light bulb.

Do you know where I can find it.

Thanks,

John

[487livespot]

love the vids Dr. Z but i was woundering if you had any information on the OutSide Thermostate. we're learning that in class i just wanted to see if u had any advise on wiring/pros/cons of the OutSide thermostate. thanks!!

[DrZarkloff]

@487livespot Do you mean the outdoor temperature sensor that's tied into the indoor thermostat?

[PutSome5tankOnIt]

Relays are fascinating little beasts. Kinda cool to watch The Good Doctor cook a component with line voltage! I wish I had Smell-O-Vision to fully 'enjoy' that demonstration. Reminds of the ONE time an FAU circuit board was fried on my watch a few years ago. Yup. Slipped right under my nose. Low voltage wires at a contactor connected to the line voltage side. I learned a valuable lesson a few seconds after the 'magic smoke' left the board: ALWAYS check the wires visually!

[DearestBecky]

@PutSome5tankOnIt I sure smelt it tonight. It stunk and the fumes was so strong that it took my breath away. I turned the exhaust fan on over the stove and went out of the room. :P

[PutSome5tankOnIt]

@DearestBecky I'm sorry you had to endure the stench. That's what men like, though. We thrive on the real world stuff and get a kick out of the 'smell of reality'. Don't ask "why". It's a guy thing. Don't question it. We don't ask why soap operas are so important to women. We accept it and only ask for acceptance in return.

[Metalcastr]

I hate when relays get stuck. What causes that?

[DrZarkloff]

@Metalcastr relays and contactors can get stuck in the closed position when the contact weld themselves together.