Very Nice Bill! Love the visual aids! 👍

Very Good video. With video like this one Anybody can easily understand the defrost system. Thank you.

Well Professor that was a pretty dam good demonstration of a defrost time clock an cycle !! nice display to ! Blueprints available

👏🏼 I absolutely love displays like this great job 👍🏼. Hope to see more soon

Your 2 cents was priceless. Great video and thanks for making it.

Fan F-ing tastic video, Bill. Old school demonstrator panels like this are what got me into technology in the first place.

These type of vids are extremely helpful, keep up the great work man.

Many thanks Bill. I'm relatively new to the refrigeration game over here in the UK and coincidentally it was only the other day I pulled the Grasslin schematic off the internet and worked it out from that. Your video was really helpful to reinforce what I'd learned from paper, in practice. Love the passion you guys in the US have for this trade. Please keep the videos going. Although they won't be too useful for the senior techs / engineers out there, they're great for us newbies. Take care. R

good demonstration

We got to build similar displays at school in the HVAC electrical classes. I called it "contactor madness." 😀

Thank you for taking your Time and Energy to create this Demonstration.

I have asked a few guys to show how shit is wired up, and to explain it in detail. Anyone can change a bad part wire for wire. But understanding what your doing and why is golden. You did a fantastic job. You remind me of my father who passed away sometimes it's hard to watch your video's.

Great video Bill I now have a better understanding of how the defrost system works.

Great explanation Bill on a defrost circuit

amazing training video for the new guys, going to bring it up for my techs during monday meeting

Great stuff Bill!!!

You can also use your compressor discharge plus a 3 way valve,the hot gas has a temp between 150 and 170 degree depending on what refrigerant you use .Not used much today but once in a while you still see them.You still need your defrost box to send voltage to your 3 way valve and timer,fan and so on.You did a nice job explaining how a defrost works,keep up the good work.

Great setup. Great for 'hands on'. Thanks.

There may be many videos on this topic, but no one explained the principles of X and N. Now I can troubleshoot the DTFD switch from the timer. Nice, your the man.

Awesome job bro!! I appreciate the hard work you put into this one!!

Great example and explanation on the defrost timer man.

keep up the great work sir. thanks a lot

masterful explanation !! greetings from Argentina friend

You are so Great, better that a teacher

great video!!! Please make more of those 🙏🙏🙏

I had to watch it 3 times but I think I have it now. I’m not in the trades but recently built in evaporator for a cold bay table. I added a 2nd condenser unit to the system. The problem is I’m using DC fans that run continuously and I have to manually defrost the additional coils. The original unit has shielded coils covered with stainless. Also I must thaw these manually. All that was background. My goal is to add a defrost cycle and heaters. I understand the wiring as you explained. The DC heaters has a AC inverter so I can rig a power outlet from the grasslin mimicking a fan delay. Still working that out. The answer is in your setup. It’s working on 120 Ac which makes it easier. Thanks for your video.

Liked a lot really showed me how the defrost works great help

Awesome demo... really helped a lot. Thankyou

Great video. Excellent explanation about dfrost clock. Thankyou

Th8s is a great display. I wish I had something like that to show me the functions when I was starting out years ago. This should really help guys just starting out in the trade.

Good 1 Bill ... Well demonstrated ...

Really sweet rendition of a defrost circuit! I too live stuff like this. Great explanation of how it all works together. Keep up the great work. Also, I gotta say that I love your bumper sticker on the cabinet. I think you know the one. Up with dogs, down with cats. 😆😀

You know I’m a BASIC kinda guy.😆 Nice job! You get a 👍 from me for this.

I'm trying to get into commercial outside repair,I saw you do some of that,you should video how you fix that stuff.Good explanation.Stay safe.

Love videos like this... All your videos are very informative!!

great explaining ..amazing thank you

Great demonstration awesome

Great video brother 💯💯💯💯

Awesome explanation. Thank you!

Good stuff Bill 👍👍

Great tutorial

Excellent

Good job Bill 👍

thank you so much for sharing, clear explaination and easy to follow.

Bravo sir!!! Great video!

Wow you did an excellent job on that explanation

Excellent video

a 3-way switch also seems like a good thing in place of the two. they're single pole double throw(SPDT). same function as the klixon switchng from one to the other :)

Coming from commercial rtu’s to ref. systems, the def. Timer is still a little mind F for me, this helped, Thanks👍

Great video!

You are so smart !!

What a great tutorial, thank you

Nice project and well done!

Bill ,,,,muy bien explicación,,,exelente,,, saludos Lorenzo,,,,,👍👍👍😀

Thanks sir your explanation helped allot.

Let talk about it!! 😂😂😂. Awesome video Bill. Good stuff brother. Very informative video my man. 💪🏻💪🏻👊🏻👊🏻🤟🏻

Excellent video Bill, I sent it to my apprentice. 😁👍🤘

Very well explained, very instructive. Thank you 🙏 very much for your teaching. God bless

Great video thank you

Thanks for the awesome lesson! I’ve only seen 2 and 4 cycle the fans and have never seen the F terminal used to cycle them. Is there ever a time for that?

Nice 1 curious guy.BG from down under.

Thank you.

Very good video!!

Great explanation Bill 👍👍

So where in the walk in freezer are the light bulbs at that indicate fan defrost and fan? Lol just kidding. Haha great video! Learned a lot! I’m in school now for hvac/r not sure if I want to go the route of residential or commercial. More I watch your videos tho the more I’m being swayed to commercial haha keep up the awesome work and thank you for taking the time to make these videos!

you can use a 3way switch for your termination/ fan delay switch. it will better simulate the combo switch.

Thank you sr.

great video do you have any tips on getting better at reading rtu schematics or ladder diagram ? thank you for you're time

Great video... are there commonly used demand defrost versus timed defrost like the video shows? From a resi standpoint This seems like an old school heat pump defrost versus new demand style

Great video.... do you ever use the Danfoss MP54 oil pressure switch? that would make a great video to do 👍🏼, love your work brother, thanks for sharing.

What type of switches did you use for the fan delay and termination? And how’d you wire them up

you could wire the actual defrost termination switch in and use component "freeze spray" to make it cycle. not very cheap and you don't want to use a ton of it ;) then again, just use and recovered R134a (as liquid through a nozzle) which is what "most" of those sprays are, I believe some are now R1234ze...

Does the compresor turn off when defrost come on? If you check with the multimeter between N&4 you shouldn’t get power correct? I. This case is a 120v freezer. If I get power all Across the board with all the pins in refrigerations and defrost is a safe bet to think it’s time for a new defrost clock? Thank you in advance

El tecnico curioso👍

Damm Bill.. Have to watch this video because you took the time to make.. And don't ever use defrost clocks or defrost determations switch.. I use digital controllers and sensors.. But basically it's the same

Good display. However what about a walk-in cooler where the fans are constant and the compressor is wired through a thermostat. My staff has a habit of leaving the door open to much and the coil freezes from time to time. I want to install a defrost clock so at night I can ensure a consistent defrost cycle. Thanks. It has 220V

Great video. My question is when the defrost termination switch closes the switch on red to brown, does that also close the switch on 2-4 even if the timer is still in defrost? I’m a bit confused there.

I'm gonna install a toggle switch now 😂

👍👍👍

You can use a 3-way switch for the defrost termination and fan delay on your board. Awesome though thank you.

Great job on the beard.. how long.. ? I am.only 1 year inn 😂

ive KEEP questioning the service AC man in our company why our walk in freezer during deepfrost time the compressor is still running. no answer at all. is that correct sir

Bill, you forgot to wire your beard to the elusive "F" terminal on that Graslin.

How to paragon defrost timer to replace electronics timer defrost electrical wiring sir ty for sharing your talent

Does your meter have a LoZ mode?

Can some one explain, why there is a reading in x and n. If the circuit is open. But then there is no reading when the circuit closes? Thats the one part that i dont understand. Other than that, really helpful video thanks

I'm surprised this type of defrost circuit hasn't been rendered obsolete by electronic controllers with coil temperature sensor and all that fancy stuff...

Holy fancy pants 😁

Great video brother 💯💯💯💯