250' Condensing unit piping
250' Condensing unit piping
(OP)
I had a rep from Carrier tell me today that if he used his condensing unit with Semi's that he could pipe 250' of refridgerant no problem. He doesnt know that I have a Carrier book as well, and all he is using is a chart that has tonange vs. length of line on a logrithmic scale. This scale goes up to 500'! I think we are going to have serious problems getting oil back to the compressors. Does anyone have any experience with refridgerant piping this long? How did it work out?
Thanks,
CB
Thanks,
CB





RE: 250' Condensing unit piping
From what you've already said, it appears to be at least a 10-Ton C/U (since that is the smallest C/U Carrier still offers with Semi-Hermetic's).
Regarding Piping Sizing: Are you referencing Chapter 3 of the System Design Manual?
I have done long lines applications before, but not with units that large. I have used 38HDR's with no issues yet... making sure to include a LLSV, Crankcase Heater, Hard Start Kit, and hard shut-off TXV at the AHU/FCU.
I would give the attached PDF a look, and would also check out Chapter 3 (in case that is not what you're referring to).
Hopefully someone else chimes in with experience on the larger units. I typically stress that other avenues where the length can be reduced be pursued instead (if possible).
RE: 250' Condensing unit piping
CB
EngA
RE: 250' Condensing unit piping
CB
EngA
RE: 250' Condensing unit piping
You'll notice within the unit's Product Data that the 'typical refrig. charge' is about 62 lbs with 'standard' line lengths for that machine (38AH044). (See it here: ht
Check out page 123- for line sizing. You will notice there is no data for over 200+ linear ft.
Are you able to reduce the line length in this application? I would seriously look at all other options if you haven't already...
Re: the 4lbs/ton guideline... I'm not entirely sure where that is derived from... I will see what I can find out, sorry.
Are you in AB/BC?
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping
RE: 250' Condensing unit piping