Mr Ty you are such a awesome teacher hard to find people like you sharing their knowledge all these years with us. As a senior tech that gone to school and being in trade and teaching others you are my Hero If you ever come to Sacramento California My treat. God bless you 🙏.

Very cool. Excellent explanation of the crankcase heater and it's purpose. Thank you.

great job TY!

Very informative and well explained! Thank you sharing your knowledge. Keep it up 👌

Excellent!!!

Golden information man. Thanks.

Nicely explained. 👍

I used to work on A C systems in buses. When we started using R134a we had a problem with liquid refrigerant migration back to the compressor, Carrier o5G, when the system was off. Upon the next startup of the system this liquid would break the Reed valves in the compressor. We had to add a check valve in the discharge line and a liquid solenoid valve upstream of the txv.

Excellent video Grateful i found you! Like your other videos your explanations are excellent. One negative is you talk a little bit fast

👍👍awesome explanation. 🇬🇾🇬🇾🇬🇾🇬🇾

Excellent. Thanks.

Very nice tutorial besic i have an idea to know what is proposed about crank case heater. Thank you sir

You’re such a badass and this channel is so fucking awesome 🙏🙏🙏

If your unit doesn't have a crankcase heater - can we assume it uses that low current through the windings to keep the compressor warm in order to avoid refrigerant migration? You're videos are awesome btw - I'm just a homeowner but have already learned a bunch! Keep up the GREAT work!!😁

An HVAC guy in a room that's 95 degrees...don't you know someone who can fix that? ;) Seriously, though---awesome stuff!

So what happens on cars when the ac is turned on in the cold?

As always 👍🏻 🥃🥃🍺🍺🍺🍇🎳 Stay safe. Retired (werk'n) keyboard super tech. Wear your safety glasses.

So i could ditch the board, set up a relay with crankcase heater contacts on NC And have my red wire from the tstat on normally open. Thank fully i live im the dessert where i migjt need defrost once a year. This is on a unit donated for my house from a job, i know doing this at a customers house would be last resort option

Let’s see if Ty knows the answer can you drain the liquid refrigerant from one cylinder to the other just by gravity only one tank suspended above the other top cylinder valves facing down. connected with a short hose ???? Yes

I have an interesting story related to this somewhat. At one of the schools i work at we have water furnace geo reversable chillers and after changing out a RV about a year ago, I was all done with repair and had system evacuated down to 350 or so (dont remember exact) and I was trying to see the oil level on one of the compressors but it was hard to see so for some reason i thought if i tapped on the glass with my nut driver i May see if theres oil that moves and i would know theres oil in there. As soon as i tapped the glass the oil imediatley foamed/bubbled like you mentioned and my vacuum shot up to idk lets say 2000 i cant remember, either way i lost my deep vac. I had never experienced this before and I knew that it was either refrigerant or moisture boiling out of the oil but im still confused to this day as to why it didnt boil off until i tapped that glass. Those chillers are installed in a mechanical room that stays about 75 or so degrees all year round but now Im wondering if maybe the CCH was shot. I too didnt think they are necesary when unit installed indoors. Has got me thinking now, i will check it next time i go there.

Is there a typical ambient temperature above which the crankcase heater is no longer needed? I've noticed "CCH Optional" is sometimes called out on the system schematics but I'd imagine you'd want the compressor to be the warmest system component whenever the compressor isn't running. What's your experience on a system that leaks down enough to cause the compressor to go out on thermal overload, is this likely to result is an acidic condition (say for an R22 system, for instance)?

Hey there Ty, did you happen to post any videos of the actual wiring portion of the crankcase heaters, been super intrigued with them lately, would love your take on it.

Is it true that system refrigerant capacity is the deciding factor as to if a CCH is needed on a scroll compressor? I have a heat pump with no CCH, came that way I believe. Shows a CCH on schematic, but copeland says some systems don't need them depending on amount of refrigerant. Any thoughts?

Is a crankase heater needed or recomended for a rotary compressor? I don't normally see them installed

Sorry if I missed something but I'm confused on your experience of hooking up multiple tanks together. I totally understand migration and pressure/temp relationships, I'm not confused on any of that. I work on very large comercial systems as well but never have hooked up multiple tanks in series. What is the benefit? Was the end plan to have your recovery machine pump into the large tall tank and then the smaller tanks would fill up naturally from the pressure differential between the system and the inlet to your recovery machine? I guess I just answered my own question lol. I've just never done it that way. I use the large tanks at times but I pump into it till about 80% and then stop the process and then hook up another one. Never had any tanks hooked up upstream of my recovery unit but now I'm wondering if I'm missing out lol. Would want to have a scale for each tank though and isolate the furthest tanks as soon as they reach 80% something I'm going to look into for sure

So does it always have to be on when the system is off. Or could we heat it up before starting ? Lets say its gonna be very cold outside for a few days or weeks. Could i just turn the crankcase heater on the day before restarting the system ? Or does the compressor always have to be hotter than the inside temperature even if off for a long time ?

T in rii I