What is R-771?

[halbarad]

Does anyone know what R-771 is?

It's in a refrigerant properties program that I have, but it doesn't say what it is. I know it's not a typo for R-717.

[TXiceman]

11. The 700 series has been assigned to inorganic compounds. Within the 700 series, the relative molecular mass of the compounds is added to 700 to arrive at the identifying refrigerant numbers. When two or more inorganic refrigerants have the same relative molecular masses, uppercase letters (i.e., A, B, C, etc.) are added to distinguish among them.

Ammonia is 717 by adding 700 + N (14) + 3 H(1) = 717

If it is 771, it would have to be a fairly heavy inorganic compound with a MW of 71.

Only thing a web search turned up was a Sherwood model R-771 surround sound receiver.

Here is a link for the US SNAP program for refrigerant replacements;
http://www.epa.gov/ozone/snap/refrigerants/REFLIST-20060928final.pdf

Ken