2007年2月21日 · No doubt, MP-39 is one of the best replacements for R-12 in medium temp applications. But there is no such thing as a drop in for R-12, MP-39 is classified as a near …

2012年3月5日 · MP 39 was a failure, I couldn't get the box below 25 degrees without starving the system for refrigerant and creating flash before the tev. Gonna reclaim and try out mp 66, as I …

2013年1月31日 · We've used MP39 since the R-12 phaseout, same with HP80. Both work very well, with any oil in short coupled applications. 134A has been nothing but a nuisance with it's …

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2008年6月16日 · Check your oil for acid, check the TXV, and check out your oil type in the new unit, print the Dupont MP-39 page and take it with you. A half assed retrofit may have killed it …

2011年5月16日 · Worked on an old R12 reach in other day. Med temp min oil. Fixed leak opted to use MP-39 instead of hot shot. Recall an old timer who told me he didnt like using hot shot. …

Have been using R-420 (RB-276) for the last three years. Had used MP-39 and R-409, both good, but again head pressure being a problem here in the warm areas. Have found that R-420 is a …

2014年5月3日 · The unit had MP-39 written on the compressor and electrical cover. after hooking up gauges and checking superheat and sub cooling i believe it to honestly be MP-39 (R-401a) …

2011年3月26日 · MP = medium pressure 39 is the last two digits of the assigned research number 66 is the last two digits of the assigned research number HP63 & HP80 & HP81 HP = high …

MP39 (R404A) is an R12 interim service replacement refrigerant for medium temperature. MP66 (R401B) is the only one designed specifically for low temperature applications, and from my …