Search:

Type: Posts; User: All-Good

Page 1 of 2 1 2

Search: Search took 0.00 seconds.

  1. Thread: mo99 problems

    by All-Good
    Replies
    45
    Views
    3,613

    [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
    3,613

    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
    572

    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
    Views
    572

    Replacing R-22 with R-438A

    R-438A is a very versitle replacement for R-22.
  5. Replies
    13
    Views
    2,366

    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
    Views
    2,366

    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
    Views
    732

    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
    1,515

    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
    528

    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
    528

    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
    22,740

    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
    Views
    22,740

    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
    5,476

    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
    1,107

    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
    1,107

    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
    5,476

    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
    1,711

    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
    5,672

    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
    1,807

    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
    2,038

    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
    2,038

    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
    2,549

    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
    3,375

    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
    3,375

    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
    2,549

    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,...
Results 1 to 25 of 44
Page 1 of 2 1 2
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event