Defrost circuit in a commercial application
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- Опубликовано: 29 июн 2020
- Lets see how a defrost circuit operates
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Very Nice Bill! Love the visual aids! 👍
Well Professor that was a pretty dam good demonstration of a defrost time clock an cycle !! nice display to ! Blueprints available
Cool, thanks
Very Good video. With video like this one Anybody can easily understand the defrost system. Thank you.
Glad you liked it!
👏🏼 I absolutely love displays like this great job 👍🏼. Hope to see more soon
Thanks so much! 😊
We got to build similar displays at school in the HVAC electrical classes. I called it "contactor madness." 😀
These type of vids are extremely helpful, keep up the great work man.
Thanks, will do!
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.
Great setup.
Great for 'hands on'.
Thanks.
Great explanation Bill on a defrost circuit
Thanks!
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.
Your 2 cents was priceless. Great video and thanks for making it.
Glad you enjoyed it!
Great stuff Bill!!!
Great example and explanation on the defrost timer man.
good demonstration
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.
Glad it helped!
Great video Bill I now have a better understanding of how the defrost system works.
Awesome demo... really helped a lot. Thankyou
Thank you for taking your Time and Energy to create this Demonstration.
My pleasure!
Fan F-ing tastic video, Bill.
Old school demonstrator panels like this are what got me into technology in the first place.
amazing training video for the new guys, going to bring it up for my techs during monday meeting
You are so Great, better that a teacher
keep up the great work sir. thanks a lot
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
Glad to help
great video!!! Please make more of those 🙏🙏🙏
thank you so much for sharing, clear explaination and easy to follow.
Good 1 Bill ... Well demonstrated ...
Awesome job bro!! I appreciate the hard work you put into this one!!
Glad you enjoyed it!
Very well explained, very instructive. Thank you 🙏 very much for your teaching. God bless
great explaining ..amazing thank you
masterful explanation !! greetings from Argentina friend
Many thanks!
Great tutorial
Liked a lot really showed me how the defrost works great help
Glad it helped
Awesome explanation. Thank you!
You're very welcome!
Love videos like this... All your videos are very informative!!
Glad you like them!
You are so smart !!
Thanks sir your explanation helped allot.
Coming from commercial rtu’s to ref. systems, the def. Timer is still a little mind F for me, this helped, Thanks👍
Great video brother 💯💯💯💯
Great video. Excellent explanation about dfrost clock. Thankyou
Glad it was helpful!
Excellent
Bravo sir!!! Great video!
Thanks for watching
Great demonstration awesome
Thank you! Cheers!
Good job Bill 👍
What a great tutorial, thank you
Glad it was helpful!
Wow you did an excellent job on that explanation
Thank you!
Great video!
Thanks!
Excellent video
Thank you very much!
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.
Thanks
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.
Nice project and well done!
Thanks!
Great video thank you
Glad you enjoyed it
Very good video!!
Thank you very much!
Excellent video Bill, I sent it to my apprentice. 😁👍🤘
That is awesome!
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.
Mr Slim 1959 . Normally Electric defrost not RV. Electric works out much cheaper on components
Bill ,,,,muy bien explicación,,,exelente,,, saludos Lorenzo,,,,,👍👍👍😀
Lorenzo gracias por veer mis videos y tambien por tu resena
Good stuff Bill 👍👍
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. 😆😀
Thanks a lot!
Nice 1 curious guy.BG from down under.
Very cool
You know I’m a BASIC kinda guy.😆 Nice job! You get a 👍 from me for this.
I appreciate that!
Thank you.
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!
Let talk about it!! 😂😂😂. Awesome video Bill. Good stuff brother. Very informative video my man. 💪🏻💪🏻👊🏻👊🏻🤟🏻
Appreciate it!!
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 :)
Great explanation Bill 👍👍
Thanks 👍
Thank you sr.
Welcome!
you can use a 3way switch for your termination/ fan delay switch. it will better simulate the combo switch.
El tecnico curioso👍
Gracias, soy muy curioso- lol
great video do you have any tips on getting better at reading rtu schematics or ladder diagram ? thank you for you're time
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?
I'm gonna install a toggle switch now 😂
How to paragon defrost timer to replace electronics timer defrost electrical wiring sir ty for sharing your talent
What type of switches did you use for the fan delay and termination? And how’d you wire them up
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
Thanks for watching
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.... 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.
I have not used that switch- sounds interesting though
👍👍👍
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
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...
R1234 is flammable I believe !
You can use a 3-way switch for the defrost termination and fan delay on your board. Awesome though thank you.
That's a great idea!
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
There sure are, demand defrost is the way to go - every once in awhile I can convince a customer to upgrade to a KE2 control with demand defrost
Bill, you forgot to wire your beard to the elusive "F" terminal on that Graslin.
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
Great job on the beard.. how long.. ? I am.only 1 year inn 😂
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.
Yes it does, it jumps right into refrigeration mode
Just another question. When the system is in defrost, will there be a short circuit between 1 & N? As the red to black switch would be closed(?) would current flow then be L1, 1, control power, N, L2?
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
hey bro- send me an email if ya can curioushvacguy@gmail.com
Does your meter have a LoZ mode?
No, I need to get one that has that feature- any recommendations? curioushvacguy@gmail.com
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...
Oh, many companies manufacture an all-in-one controller with a nifty digital display.
Guess how often they break.
Holy fancy pants 😁
Great video brother 💯💯💯💯