How Much Refrigerant To Add Per Foot Of Lineset
Refrigerant Line Charge Adders
I am often asked how much refrigerant should exist added to a separate system? Nosotros preach that the best way to charge a new install is to always Counterbalance the charge into the unit of measurement.
Well, that varies from manufacturer to manufacturer. In that location is no standard answer. Yous need to encounter what the "operating accuse" for the unit of measurement is from the manufacturer's data on the specific piece of equipment. Yes, it means that you lot actually have to read the instructions.
In those instructions that you are reading, you need to find out what this accuse includes. Does it include just the outdoor condensing unit? Does it include the outdoor unit and a matched indoor coil/unit of measurement? Does it include the outdoor unit, matched indoor unit of measurement and so many anxiety of line set?
This data is published in every manufacturer's instruction packages or technical guides.
The just constant is the possible boosted charge required for lines over what the manufacturer is providing charge information on. Every bit an example, if the manufacturer'south information says a unit holds 14 pounds iv ounces of R-410A and it includes a matched indoor unit and say, 25 feet of line gear up — but you have 63 feet of line set — so what do y'all practise? How much additional refrigerant practice I demand to weigh into the system to be accurately charged? You use this handy-smashing chart below to calculate the boosted refrigerant needed to fill up the system by weighing in the proper amount.
You need to find your line sizes, both suction and liquid (and remember — air conditioners are exterior the building and so all these pipe sizes are OD). You demand to observe your refrigerant blazon (and in the instance nosotros said R-410A). You demand to go your estimator out, subtract 25 feet of line that the manufacturer already allows for from the 63 anxiety total line set ( 63 -25 = 38 anxiety). At present you lot need to know that pipe size so let's say 1-1/8″ suction line and a 5/8″ liquid line (commercial unit).
Now nosotros wait at the chart and come across that 1-1/8″ SUCTION lines take 0.20 ounces for R-410A and 5/8 liquid takes ane.64 ounces of R-410A. (Suction lines incorporate vapor and so they never crave a lot of boosted refrigerant but liquid lines should always be full of liquid so the bulk of the additional charge is for the liquid line). Add these two together and multiply the total past 38 anxiety — the additional line set nosotros demand to add for — and you have:
0.20 + i.64 = 1.84 ounces / ft X 38 feet boosted = 69.92 ounces
Then take the 69.92 and dissever that by xvi ounces per pound and you demand to weigh in 4.37 pounds (or 4 # five.92 ounces) of additional refrigerant to consummate the system charge.
So, to sum it upward — weighing in the charge is always the best fashion to charge any new piece of equipment. To do it right the first time, you demand to read the manufacturer'due south data on what they provide in the unit of measurement and what that accuse includes. Then yous can used the chart above to weigh in whatsoever additional charge that might be needed.
Ane other thing — if your line set is SHORTER that what the manufacturer accounts for so y'all tin use the chart to REMOVE charge accurately by weight also based on the line sizes you have at the site.
Source: https://yorkcentraltechtalk.wordpress.com/2013/07/26/refrigerant-line-charge-adders/
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