Hi guys and girls,
long time browser, first time post (just signed up)
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.