HP81 (R402B) is in a 13 lb cylinder and its ASHRAE designated color is Green-Brown/Olive.
HP81 replaced 502 in Manitowoc ice machines. Dupont MP39 for R12 AND CHANGE txv
Who still has original R-502 Ice Machines?!
Officially, Down for the count
YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET
I know enough to know, I don't know enough
Why is it that those who complain the most contribute the least?
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Hi guys and girls,
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I dont do alot on ice makers down here, but as for hydrocarbons, here in oz thats the way they are pushing us! there only flamable between 2.5%-10% concentration, in saying that if there is no ignition protection on any of the parts its a no no!
not sure what gasses you have in the states, were still using SP34E and R406A for 12 "drop ins"
on such an old machine, avoid HC's.
>Muz
Manitowoc is coming out with HC
Would agree and wouldn't consider it as a drop in. You'll get blamed for something even if it isn't your fault!
“If You Can Dodge A Wrench You Can Dodge A Ball”
It looks like they've been testing R290 (Propane): http://www.danfoss.com/BusinessAreas...Ice+Makers.htm
HP81 was a replacement for R502 0n Manitowoc Ice Machines. It worked fantastic and at the time of development was huge secret. I have converted out of warranty Hoshizaki's from R502 to HP81, along with isolating the discharge line in harvest with a check valve and have seen huge improvements of operation on a KM cuber. This refrigerant was a great replacement, one of the best. Although it has been debated as to using it in other refrigeration equipment, I have never had an issue using it.
I remember Manitowowc had many problems with their TXV's. The part number 76-2109-3 will for ever be engrained into my memory. They switched to Danfoss which i think is a superior TXV compared to any valve on the market today......if you can braze correctly.
Bringing back an old thread!! I got a full 30lb canister if r-12 off some kid for $100 because he did not know what it was.. Anyway.. Charged up the machine and the head pressure will rise but the suction stays in a vacuum. So now its time to change the TXV..
I figured you had a bad TXV. $100 for 30lbs of R12 isn't too bad. It isn't worth much anymore, contrary to what many believe.
What about MP39?