Very pragmatic with practical eye on what is going on. Though I am a novice I will give you 10 out of 10. May God bless you for your good intentions.Nice guy.
Man for me this is the best explanation video on this subject. Thanks for sharing and putting in the time to make that mock setup for all of us to see and learn from.
This helped me out on a long hard day where i found myself confused and frustrated on a job. Came home to do some learning and this really did the trick.
I am running into units with thermisters and electronic timers. I am not for certain if that kind of mechanical timer would work on the higher tech systems.
Charles. Great video!!!! I have a question. How is the compressor able to accomplish pump down of the system,when I switch from 2-4 refrigeration contact to defrost 1-3 (now closed)? I can't see it how it's done,since evaporator,thermostat and solenoid are all in series on the same circuit,namely 2-4. By switching from 2-4 contact to 1-3 contact now energized, I de-energize the solenoid,now closing and pump down can't be accomplished by the compressor. Please help me understand this problem. Thank you
The compressor is not part of this circuit. Only the solenoid that controls flow of refrigerant. Once the solenoid closes the condenser still runs pumping the system down. Eventually the low pressure switch on the condensing unit triggers and opens the circuit shutting down the compressor.
If you are adding a pressure switch to the defrost clock for the purpose of termination, then yes. The pressure switch will close, lets say on pressure rise, its switch will close, then energizing the termination solenoid on back of the clock ending defrost, clock reverts back to normally open/closed positions.
How do yu set thermostat and timer to work together, If I want my freezer to defrost 4 times per day yet the temperature will rise to cut the compreser through thermostat even more than 4 tyms?
i have kitchenaid model is YKBRS21KAW00 my problem is .if the temp control is off!! the defrost timer is making noise and advance, evap fan is running but slow and compressor wont start.but freezer will be cold but if the temp control is on!!! the compressor start ok freezer stay cold,but defrost timer is not making that noise and does not move a bit, evap fan won't start at all and inside the fridge part its hot no air coming from the vent in fridge. . the light in fridge and freezer stop working and there is a small switch for uses less energy if flip one side and flip on other side is for reduces exterior moisture the light does not come on either on the switch. not to sure what this switch do but din't seem to make a difference in the pass but i know that light was coming on if it was flip on before . any suggestion of what can be wrong ? I change the defrost timer and i change the evap fan and the temp controler too at the same time !.something is running backward but not sure what could do it ... Show less
excellent video Charles. I'm 7 years too late, but it still is a great teaching tool. Thank you for sharing your knowledge. This is so very well displayed. Thank you!
I’m 3 min into the video so far very informative. Just wanted to tell you the symbol for your limit switch is backwards. Should be above the decimal. They way you have it drawn indicates the switch opens on temperature fall and closes on temperature rises you want it to open on temperature rise and close on temperature fall. Just some constructive criticism. Keep up the great work!
When I go to Sam’s Club, I noticed that sometimes the evaporator fans in the coolers holding the frozen foods are off. I assume that when the fans are off, the evaporators must be in defrost mode as you have described in this video. However, when I look at the evaporators in the refrigerated (non-frozen) foods cooler, those fans are always on (never off). What defrost system do you think the evaporators in the refrigerated foods cooler have which does not require the fans to go off? Or is that the fans do go off in defrost mode, because of the warmer temperature that the refrigerated foods cooler is in, the defrost cycle does not happen as often?
Some air defrost walk in coolers do not have electric heater. Most fans in these coolers are always on. Here is the walk in cooler which is air defrosted. www.johnstonesupply.com/storefront/product-view.ep?pID=B92-118
you usually don't need a defrost in a cooler. otherwise the defrost just shuts the compressor off for x amount of time and let the fans . the only time you really have problems in coolers is when you lose a fan(or multiple fans) or a very dirty evap coil restricting air flow. Then the coils will freeze up
I helped our warehouse tech to install a timer on a freezer, we followed every step and traced all of the wiring! it's not kicking into the defrost mode or turning the compressor and fans off! IDK if the wiring is bad or bad timers!
could be a bad time clock or the defrost pins are missing? the so might not be working to pump down the system, could be a bad low pressure switch, there are many think that could cause that.
I teach at an HVACR program at this would be a great mock up, did you generate a material and source list ? I looked at somem of the Hamden trainers and there wayyyyyyy to expensive, Id b super grateful if you could help us out , Id gladly send you pics and updates as my kids build your trainers ! Thanks !
Very Nice but I am kind of confused because the terminals are different on this time clock from the time clock that you showed on your two previous videos. On the previous videos you showed L2 connected to N. I reason that this may be a different time clock and it needs to be connected differently. That being so, can the time clock that you showed on your previous video be used in place of the one that you show in this video?Anyways for me you have certainly taken the mystery out of time clocks. The only thing that I would elaborate on would be that when the solenoid closes it causes a pump down and stops the compressor during the defrost.
Gotta love RU-vid College, one of the best ways to learn new things, or even just better understand things you already have a basic grasp on (which is my case). Appreciate the video Charles!
Thanks for the video. Good circuit logic setup/explanation. Only thing you did not mention the functionality of is the thermostat on the left hand side of the setup. I assume that is just a refrigerator thermostat controlling when to kick on the compressor to cool the frig. to the proper temperature.
thanks for the video, does the terminal 4 in the defrost cycle switch connected to the compressor back to terminal Xl , or compressor should be connected in series with valve and thermostat?, please clear this, thanks in advance
I would not advise a compressor be wired through the defrost switch. The compressor can pull quite a bit of amps. Although defrost clocks can handle a good amount of amps, I would control the compressor via a contactor. Then let the defrost clock, thermostat, etc control the contactor.
Usually N on the majority is for the L2 leg of power. There are done timers that N is for a different designation. Always double check your wiring diagram. You also visit the MFG. Website for instructions or diagrams. Thank you checking out the video.
i work for a company that mainly does commercial heating and cooling towers your videos explained refrigeration perfectly for me i feel like ive been working for years haha thank you and ill will 100% like and subscribe
