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  1. Thread: mo99 problems

    by All-Good
    Replies
    45
    Views
    4,190

    [QUOTE=klee7013;16325921]I got 99 problems and...

    [QUOTE=klee7013;16325921]I got 99 problems and mo99 aint one.

    Awesome. I have been waiting for someone to drop that line for awhile. :cheers:
  2. Thread: mo99 problems

    by All-Good
    Replies
    45
    Views
    4,190

    I think you answered your own question. It...

    I think you answered your own question. It probably is not the gas but, MO99 like all R22 replacements has some trade offs, specifically a slightly lower capacity (5-10%) than R-22. If the original...
  3. Replies
    6
    Views
    670

    Agree with all your points.....especially...

    Agree with all your points.....especially avoiding R-22A, it is illegal and dangerous to use as a R-22 repalcement in these applications.
  4. Replies
    6
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    670

    Replacing R-22 with R-438A

    R-438A is a very versitle replacement for R-22.
  5. Replies
    13
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    2,636

    EPA Talking Points re: r-22a

    EPA has posted official position on flammable hydrocarbon refrigerants: www.epa.gov/ozone/snap/r22a.html
  6. Replies
    13
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    2,636

    There are a number of refrigerant blends that...

    There are a number of refrigerant blends that contain very small amounts of hydrocarbons (MO99, 422D, 417A, etc.) in the 2-3 % range. Since the hydrocarbons are only present in minor amounts and the...
  7. Replies
    3
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    828

    MO99 Retrofit guide

    373131


    The low side pressure with MO99 will be a couple of psi lower than R-22 while the high side (cond) will be slightly higher than R-22. The MO99 retrofit guide has a lot of useful...
  8. Replies
    22
    Views
    1,770

    If the claims, and the price , appear too good to...

    If the claims, and the price , appear too good to be true be very skeptical. There are flammable products out there being pushed as R-22 repalcements. In addition to counterfit versions of...
  9. Replies
    3
    Views
    619

    Then again, if the evap and expansion device are...

    Then again, if the evap and expansion device are designed for 134a you will always have a mismatched system if you use the R-22 designed cond unit, no matter what gas. Best bet is to use a 134a cond...
  10. Replies
    3
    Views
    619

    If it was designed for R-22 and you don't want to...

    If it was designed for R-22 and you don't want to put R-22 in it, I would consider MO99 (R-438A) or R-407C. They both have closer matches in performance to R-22 than R-134a will. R-407C will...
  11. Replies
    53
    Views
    25,677

    Back to the topic - Trane guidelines for MO99(tm)

    FYI - Trane has published guidelines for use of R-438A (MO99) in some of their systems.

    309761
  12. Replies
    53
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    25,677

    Super - Dewper

    [QUOTE=monkeyspanners;13904831 Can never remember if i should be looking at the bubble point or dew point pt chart. Also some of the newer blends are difficult to get pt charts for (though there may...
  13. Thread: Isceon MO99

    by All-Good
    Replies
    31
    Views
    6,121

    FYI - MO99 (R438A) is non-flammable with ASHRAE...

    FYI - MO99 (R438A) is non-flammable with ASHRAE A1 designation and also UL certified as non-flammable as formulated and under worse case leak scenarios.

    A number of other non-flammble refrigerant...
  14. Replies
    7
    Views
    1,222

    A number of posts have discussed MO99 retrofits...

    A number of posts have discussed MO99 retrofits over the past few years.


    http://hvac-talk.com/vbb/showthread.php?p=12747091&mode=linear&highlight=MO99#post12747091
  15. Replies
    7
    Views
    1,222

    Critical elastomeric seals (o-rings) should be...

    Critical elastomeric seals (o-rings) should be changed as part of any retrofit out of R-22. It is an issue of the seals swelling from the R-22 and causing the potential for leaks regardless of what...
  16. Thread: Isceon MO99

    by All-Good
    Replies
    31
    Views
    6,121

    A number of folks have commented on their...

    A number of folks have commented on their experinence with MO99(tm) (R-438A) on this forum. Here is a link to some of them:
    ...
  17. Replies
    9
    Views
    1,910

    The link is the MO99(tm) (R438A) retrofite guide...

    The link is the MO99(tm) (R438A) retrofite guide and has P/T charts as well as charging information, etc
    ...
  18. Replies
    3
    Views
    6,105

    The mass flow rate of MO99 (R-438A) is very...

    The mass flow rate of MO99 (R-438A) is very close to that of R-22 so that there should be no need to change the TXV or powerhead, if the TXV was properly sized, installed, and operating with R-22. ...
  19. Replies
    17
    Views
    2,025

    R-422A, R-422B, Etc are all different refrigerant...

    R-422A, R-422B, Etc are all different refrigerant products. They are composed of the same individual HFC compounds but in different amounts. They can and do have different P-T relationships as well...
  20. Thread: R 507

    by All-Good
    Replies
    24
    Views
    2,343

    Yes, 507 and 404A have very similar...

    Yes, 507 and 404A have very similar pressure-temperature curves. At 110F, 507 is 278.8 psi and R404A is 272.5 psi.
  21. Thread: R 507

    by All-Good
    Replies
    24
    Views
    2,343

    From a chemical point of view R-507 should not...

    From a chemical point of view R-507 should not have any compatibility issues with Teflon. If a small leak is found I would suspect the tape etc. was not properly sealed in the first place if this is...
  22. Replies
    24
    Views
    2,850

    I agree with everything you said. Pinholes are...

    I agree with everything you said. Pinholes are only one mechanism for elastomers to leak after changing from R22. If the o-rings acutally shrink or deform in shape you can have a massive leak on...
  23. Thread: R22 to MO 99

    by All-Good
    Replies
    9
    Views
    3,721

    MO99 to R22 - TXV sizing

    If the valves sizing and operation was good on R-22 there should be no need to change out since the mass flow rates of R-22 and MO99 are very close.

    Depending on desired superheat and where it...
  24. Thread: R22 to MO 99

    by All-Good
    Replies
    9
    Views
    3,721

    Total refrigerant MO99 charge was 2600 lbs for...

    Total refrigerant MO99 charge was 2600 lbs for the entire store, which was probably 4 racks @ 600-700 lbs each. I have seen it done plenty of times using 110# cylinders.
  25. Replies
    24
    Views
    2,850

    Mccann, the leaks were most likely the o-rings or...

    Mccann, the leaks were most likely the o-rings or other elastomeric seals that had been exposed to R-22 for a long period of time. The R22 actually absorbs into the elastomer and causes it to swell,...
  26. Thread: Airport Xrays

    by All-Good
    Replies
    49
    Views
    2,151

    No, based on the couple of private planes I have...

    No, based on the couple of private planes I have been on, but its been awhile.
  27. Replies
    24
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    2,850

    Agreed dave1234.

    Agreed dave1234.
  28. Thread: Airport Xrays

    by All-Good
    Replies
    49
    Views
    2,151

    It will probalbly turn out these are not that...

    It will probalbly turn out these are not that effective in the end anyway. Remember when we had to anwer dumb questons like if anyone had handed us a package, or when laptops first came out we had to...
  29. Replies
    24
    Views
    2,850

    The application engineering bulletin link posted...

    The application engineering bulletin link posted above does a good job of desribing Demand Cooling and why it is needed. Simply put, R-22 compressors in low temp applications can have very high...
  30. Replies
    24
    Views
    2,850

    MO99 (R438a) has a 5-10% capcaity loss compared...

    MO99 (R438a) has a 5-10% capcaity loss compared to R-22. Most systems can handle this difference but if your rack is close to maxed out on capcaity it is something you should check on.
  31. Replies
    37
    Views
    7,479

    Unofortunately several die every year from Freon...

    Unofortunately several die every year from Freon huffing. BTW, asthma metered dose inhalers now use R-134a. The key is "metered" . As the old saying goes "the dose makes the poison". Operating...
  32. Thread: i hate you

    by All-Good
    Replies
    31
    Views
    2,308

    Agree. A cold heart, low self esteem plus...

    Agree. A cold heart, low self esteem plus alcohol.
  33. Replies
    15
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    2,033

    There are other refrigerant options to 404A/507. ...

    There are other refrigerant options to 404A/507. Like 422A or 422D which can be used with MO. Problem with 404a is residual MO needs to less than 5% or it could log in evap and kill heat transfer....
  34. Thread: i hate you

    by All-Good
    Replies
    31
    Views
    2,308

    Only on game day, in the stadium, usually when...

    Only on game day, in the stadium, usually when their team is losing have a seen that type of behavior. Dallas Cowboys in Phila comes to mind.
  35. Replies
    21
    Views
    1,321

    its not r22

    R-22 may have a very slight odor but based on what you describing I doubt thats it. I think the oters are on the right track; foul water or something worse in the ducts or walls, etc
  36. Replies
    15
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    1,187

    I love my Garmin Nuvi and have had it for 4...

    I love my Garmin Nuvi and have had it for 4 years, my first got stolen but I replaced it in kind.
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