Flooded Starts on HVACR Compressors

Рет қаралды 7,067

Күн бұрын

Refrigerant Migration can cause many issues and will lead to a failure if not corrected. When the system is off and the compressor is colder than the evaporator, because of a pressure differential the refrigerant is forced as a vapor to the colder area (the compressor), and the refrigerant will travel as a vapor from that evaporator or accumulator into the compressor. When the compressor starts up and it is full of liquid refrigerant, it will explode inside the compressor and wash away the oil from a lot of the components and this will lead to compressor issues.
Things that can help prevent refrigerant migration into the compressor:
- Adding a crankcase heater
- Set up the system to pump down
- Add a bump start application
- Refrigerant charge to oil ratio - Check manufactures manuals
- Relocate compressor if possible

Пікірлер: 42

@kylepwithers4316 Жыл бұрын

It’s amazing how much insight can be packed into a short, 14 minute video.

@RefrigerationMentor Жыл бұрын

Thank you Kyle

@coldfinger459sub0 2 жыл бұрын

I attended Trevor Matthews for a week compressor class it was worth every penny. As I was attending class I was just going through one of my jobsite locations that on one system the previous technician burnt out for compressors. And I’m just following all the procedures that are in the manual to prevent a reoccurrence.

@RefrigerationMentor 2 жыл бұрын

Thank you T lech! If anyone is interested at learning more about Refrigeration Mentor paid and free training events like t lech attended go the the events pages at refrigerationmentor.com

@toyinorodare4072 2 жыл бұрын

Thank you for the great effort in making this training.

@RefrigerationMentor 2 жыл бұрын

Glad you enjoy it!

@heinrichgerhardt6119 2 жыл бұрын

I have a 3-ton scroll split system with the condensing unit on the ground and evap in the (hot) attic. In my climate, this unit sits idle for 9+ months, so the 1st start is always flooded, since the condensing unit is colder than the evaporator (and lower, if gravity has anything to do with it). The compressor noise on that 1st startup is painful to hear! Today I installed a soft starter and it's amazing how well that works! The unit hadn't run since last September (July today), and 1st startup sound had none of the previous clattering noise as was normal after sitting for so long. I didn't expect this to work as well as it does. Yes, the "correct" way to combat this would be a crankcase heater (or bump starter as I learned from you today), but it's hard to justify expending all that power for the heater when the unit sits idle for so much of the year.

@bobbymartin5816 Жыл бұрын

Put the CCH on a switch or a time delay relay and turn it on 24 hours before you start it.

@karimmeziane4368 Жыл бұрын

If you have a liquid line valve, you can close it, run the system to lower the LP side presure to just a little bit above the atmospheric pressure (to prevent air infiltration in the system), and put an electical protection to prevent anyone else to run it. When needed for the hot season, you just have to reopen de valve and run it normally (sort of a manual pump down).

@A_mann 3 ай бұрын

Excelent Video. You hit all key points. Congratulation!

@RefrigerationMentor 3 ай бұрын

Thank you for commenting. We have many more great things from Refrigeration Mentor here linktr.ee/refrigerationmentor

@lisbonyjohn6056 2 жыл бұрын

Thank you trevor I had been following your trainings. they are very informative

@RefrigerationMentor 2 жыл бұрын

Thanks!

@resurgensix 2 жыл бұрын

Great info as always Trevor. You are the best!

@RefrigerationMentor 2 жыл бұрын

Robert thank you! Keep up the learning.

@EverythingHVACR 2 жыл бұрын

Another great video! Keep em coming

@RefrigerationMentor 2 жыл бұрын

Thank you. Will do.

@CHOMAHOMA 2 жыл бұрын

Thank you Trevor!

@RefrigerationMentor 2 жыл бұрын

My pleasure!

@Ryan-yq5dw 2 жыл бұрын

Thank you for sharing your knowledge

@RefrigerationMentor 2 жыл бұрын

You are welcome. Please share with others.

@chrisnorris1959 2 жыл бұрын

Thanks Trevor!

@RefrigerationMentor 2 жыл бұрын

My pleasure!

@sandeepmohapatra199 2 жыл бұрын

Thank u, Trevor.

@RefrigerationMentor 2 жыл бұрын

Your welcome

@jghaidajghaider182 Жыл бұрын

Good ❤

@RefrigerationMentor 11 ай бұрын

I'm glad you like it

@mirzaateeqbaig9844 2 жыл бұрын

Great Information ...

@RefrigerationMentor 2 жыл бұрын

Thank you.

@user-xj8sq4dj6n 6 ай бұрын

What of liquid at SH's below 20F for extended period of time at the compressor the oil droplets displacing oil on the internal surfaces causing friction points, thus scoring & eventually failure.

@RefrigerationMentor 6 ай бұрын

Great question. It all depends on the refrigerant. Some can run at lower superheats so cannot. Always check the compressor manufactures superheat tolerances.

@mikerefrigeration5736 Жыл бұрын

Great video. I replaced a grounded 3D semi 10 hp on a boat the other day. It had a 7/8 hot gas bypass solonoid on the discharge to suction before accumlator. It was controlled by a bypass timer and set for 10 seconds upon startup. I found out the old bypass timer was getting stuck some cycles. I replaced the timer. I wonder if someone installed this at sometime to prevent flooded start? Not really sure.

@RefrigerationMentor 11 ай бұрын

To reduce the amount of inrush current to start up I would assume.

@l.crossjr 11 ай бұрын

Great content. Why is it that manufacturers don't use crankcase heaters on rotary compressors?

@RefrigerationMentor 10 ай бұрын

Great question. I don’t have that answer for you. Reach out to the system manufacturer and ask them.

@stroffury5 4 ай бұрын

So I dumbly charged the unit r22 thru the suction as a liquid before I started the compressor up. I’m thinking that i flooded the compressor because it turned on for 5 seconds then tripped the breaker. Would I have to wait for the gas to turn into vapor as it’s been 2 days since I’ve started it, or should I reclaim some of the refrigerant from the suction side?

@EarlHayward 2 ай бұрын

If you really think you have liquid in your suction line, just use your recovery machine and pump it to the liquid side…

@RefrigerationMentor 2 ай бұрын

Sorry I didn’t get to this question quick enough. What did you do and what was the result?