If it was your own house, you could hack a 410A to work on 22. But I wouldn't do it on someone else's equipment. Different bore and stroke between the two compressors.

 

In this scenario I’m trying to replace a bad compressor on a r22 with this specific compressor which manufacture states is for 410A. I was told by fellow techs this same compressor would be fine to use on the r22 system with 407c refrigerant. One reason stated was the compatibility of the oil and refrigerant. The only down side mentioned was the internal overload would not trip on high pressure for 407c because it would not achieve the 410A pressures.


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22 / 407c compressors are different than 410A compressors.

 

Listen up, Chris.

 

Different bore and stroke? Good to know, I’ll check this out so I can explain it to my manager. Any other differences?


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Are you sure it has PVE oil in it? Yep, I just looked it up. It does. I don't think I've ever ran into PVE yet, but what little I know about it, it is better than POE oil, just fairly rare for air conditioning use so far.

According to stuff that PHM wrote about, a 410a compressor will work, but you will need to oversize it quite a bit if you want it to do the same amount of pumping as the old r22 compressor. I think he figured out that a R410a compressor will only pump about 65% as much if you run R22 thru it.

If you want to keep using r22/407c it would be best to find a closer compressor match. You should be able to go in to just about any parts house and tell them you need a 38,000 btu, 230v, single phase, r22 scroll compressor (I'm guessing that's what you need by looking at the specs from the danfoss compressor that you listed) and they should be able to go in the back and grab one for you that will work. It will most likely come with POE oil in it, which would be a good match for the r407c.

 

Are you sure it has PVE oil in it? Yep, I just looked it up. It does. I don't think I've ever ran into PVE yet, but what little I know about it, it is better than POE oil, just fairly rare for air conditioning use so far.

According to stuff that PHM wrote about, a 410a compressor will work, but you will need to oversize it quite a bit if you want it to do the same amount of pumping as the old r22 compressor. I think he figured out that a R410a compressor will only pump about 65% as much if you run R22 thru it.

If you want to keep using r22/407c it would be best to find a closer compressor match. You should be able to go in to just about any parts house and tell them you need a 38,000 btu, 230v, single phase, r22 scroll compressor (I'm guessing that's what you need) and they should be able to go in the back and grab one for you that will work. It will most likely come with POE oil in it, which would be a good match for the r407c.

Thats usually the general practice, we’ll get 407c compressors for the 22 retrofits.
This go around they are thinking we’ll save money because the specific compressor mentioned above is believed to handle both 410A and 407c situations. I guess anything will “work” but I got to bring a good case to why we should have specific 407c compressors and 410a compressors.


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It will work as long as you realize that you're only going to get about 24k btu's of work out of a 38k compressor (In many cases this may actually be a good thing, but that's going into a whole different rant and isn't really the point).

As BB said, I'm not sure that using your paying customers equipment is the place that you want to do your experimenting. Maybe in an emergency situation, but certainly not as a general rule.

 

https://sciencing.com/info-12025740-difference-between-r410-r22-compressor.html


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That article was useless. Written as a big picture overview, possibly by a guy who knows nothing of which he wrote about.

Seems really simple to me, Danfoss said no dice.


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So put 410A in it. It ain't going away anytime soon. How much does the system Hold?

 

Is Danfoss giving those compressors away ?

 

BBeerme and ammoniadog have given you the correct answers.

It'a all about size. Bore & stroke are dimensions for reciprocating compressors which give you an indication of the compressor's displacement, typically measured as its pumping volume in terms of cu ft / min (CFM). The general rule is for any given refrigerant then is the larger he displacement the larger the capacity. Scroll compressors work the same way, but the displacement is just measure differently.

Then there's capacity. Capacity also varies with displacement such that the capacity is directly proportional to the displacement of the compressor. Try to think of this in terms of Btuh/ CFM for any compressor with a given refrigerant at a given condition of suction and dicharge pressure.

The difference when you use a different refrigerant is that Btuh/CFM relationship changes greatly because the refrigerant characteristics are greatly different...not the least of which are factors such as the refrigerant density and pressures.

Long story short...the capacity of a R410A compressor running with R22 would be about 66% of the rated capacity with R410A at the same conditions. Similarly, the capacity with R407C may well be close to 50-55% of the rated R410A capacity.

Like ammoniadog correctly said, you can make these work if you know what you're doing.

So anyone who says they will work fine without mentioning the huge capacity loss and the need for upsizing obviously has no clue.

 

r44b is being promoted as a drop in replacement for r22. Have you guys looked into that?

 

Will blow up some systems. There was a BIG learning curve in the beginning.

 

Thanks for the responses, lots of good info here.

 

Wow. A post after 13 months from an OP.

Must be a record of some sort.

 

LOL