The low temp system can as they have removed 1/3 of the equipment in the store.
What about MO99? Anyone have any insight of this being a better replacement? what are the pros and cons?
Ummm. I would do it the correct way... Oil change, seal change, txv change, then put 404A or 507 if low or mid, aircon apps 407C, and a tune-in. Ok some dollar extra now, but it's totally worth it in the end.
Originally Posted by Gnarly
We want to. Trying to convince the customer is another thing.
Jp, I was just asking cause the ones I have been involved with, a total of 3 in my career, not many, 1 in TX, 2 in MI, we did change them.
Its gotta depend on the valve manufacturer. Gotta. I dunno. Curious now. I wanna know why.
I will be finding out this next week.
Let me put it in this way... A friend of mine was called to a boat, where the system (R22) was leaking like a schweizer cheese. Well anyway. System was empty when he came there. Fixed all leaks, pulled vacuum, and filled'er up with 417A. T'was no success... Freezers didn't hold more than -10degC/14degF, refrigerators was around 13degC/55degF
Why he filled with 417A? In sweden weren't allowed to fill CFC (stop by year 2000) or HCFC (stop by 2004)
Oh... 417A has 30% loss compared to R22
Are you changing every BV in the whole store? Doing a rebuild for each EPR valve as well? What about other valves? Sounds like a cool project to be on!
Originally Posted by Phase Loss
I am having very good results with R-417A also known as DuPont MO-59. It can be topped off in an R-22 system and requires no special oil.
I have a white paper duscussing these attributes which prompted me to try it out.
My test machines are golden and the price is decent through Airgas Refrigerants.
MO-99 may be something that is being orchestrated in new systems from high political levels, but my experience with it is not positive. If you carefully read the documentation, it says
[paraphrased] ......do NOT liquid charge the compressor, permanent irreversible damage will occur.
MO-99 does not seem to get along well with any oil, and it will definitely wash the oil right out of the compressor during tightly controlled liquid charging.
Its not impressing me.
Don't they all say no liquid charging at suction?
Originally Posted by StarCat
Controlled liquid charging has been done since the dawn of refrigeration time, and it will definitely continue.
I've only seen MO-99 used once, and my boss made the same comment. The sight glass looked "muddy" and he told me it was oil.
Originally Posted by StarCat
Remember R-12/R-502 compressors ?
Do you remember when compressors were dual-rated for R-12 & R-502 ? <g>
Originally Posted by icemeister
The conventional view serves to protect us from the painful job of thinking.
Copeland appears to be heading back to doing that with their new FFAP scroll condensing units which are compatible with R134A, R404A, R22 and R407C:
Originally Posted by Poodle Head Mikey