I work only in Ultra Low temp,so here is my question.
I helped a buddy of mine install a heat pump resently 22000 btu,the unit is pre-charged ,as I assume they all are?; However we needed an additional 25'Feet of pipping size (5/8).So how much more refrigerant should we add to compensate for the additional lenght of pipping?
read the lable it is ritten on it
so many oz for every so many feet after the precharged lenth. normaly it goes by the liquid line lenth
The installation manual should tell you that; every make is different.
Usually it is 3oz for every 5' over 15'
25-15=10 divided by 5 = 2 times 3= 6 ounces
Generally it is .6 oz, yes .6 oz, for every extra foot over 15ft.
So, if you used 25 feet of lineset, you need an extra 6 oz.
(10 extra feet)x.6oz= 6oz...
What brand of pump? Some come precharged for 15 ft.( york, rheem,ect) and some (carrier, bryant ect.) come precharged for 25 ft. Check your lable as tiknocker advised.
Also the 5/8 is the suction line(gas). You should have a 3/8 liquid line. If you have a 1/4 liquid line you will have to adjust the additional charge per ft. for 1/4 line.(I have seen 1/4 liquid lines on 2 ton units)
[Edited by danj on 04-10-2005 at 08:52 PM]
Thx...Gentlemen and my appologies it was a 3/8 line.
Chad711 - .6 for every foot over 15 is 3oz. for every 5 - its the same thing