Thanks for the link but I was hoping to get a exact length for the Supco BC-2 (.040") to replace a OEM 144" .040"
Hey Lusker Don't ask me how but I came up with just under 120" using that chart. I don't think you can reverse the chart so the recommended size is .042" on the left and the top doesn't show a .040" so I scaled the multipliers range for .036" to .042" to come up with a multiplier of .832. Therefore;.832 x 12 = 9.98' or 119.76". Any of this make sense?
I know you can't scale due to the ID corrections and physical dynamics of liquid flow rates and specific weights of gravity, if I can think out loud here. They have no correlation between sizing like that.
The way I figure it Math is Math. A division is same as a multiplier just reversed. Just seems logical but scaling is guess work. Would you agree with that?
I would also be thinking out loud if I said that your length would also depend on the refrigerant type and again if you are changing refrigerants.
There's a trick you could use that will help you tweak the system after you install your best calculated guess cap tube as it pertains to critical charge.
Here's another one... go to the left hand column .040 and if you take a look at the difference between .031, .036, and .044 to the right you will see that it supports both our theory's. They all have .31 difference in mulitpliers for .004 in ID.
OK to add to my confusion. I call RHS and ask for a OEM part # for a Bverege Aire mdl SP60-16C prep table cap tube replacement. It xref's to a .042 @ 144" in their book. I look at Supco's chart for a 1/4hp 134a med temp size and it gives me 99" of BC2 (.040). Can't see the #'s on the compessor unless it's pulled. RHS says 1/4hp HMMMM. All too general. My concern is that when RHS ships it comes with a note with the 144" .042 to cut to.... I guess I'll adjust by the actual length of the exsisting cap tube tomorrow