Still trying to figure out

[flajoker]

Did the manuel J on my house last week and now i'm trying to establish if infinity ydb 3ton 2 speed heat pump and fe4annf003 has enough btu to cool to 70 degrees.
Looking on spec. chart it shows a total of 34,600 btu for set up.
It also has a notaion to deduct 835 btu sensible capacities for each degree under 80. I think I read that right. I just don't know what true sensible capacitiy is for my set up.
Can someone please give me that info.
The manuel J my ac guys did came up with 30,752 sensible and 2070 latent...32,822 total . Loss 31,740
Mine came up a little different mainly I think I added for heat from computer and home theather equipment.
Mine ended up as 29,160 sensible and 7,785 latent...total 36,945. loss 33,463
Design: indoor summer 70
winter 72
humidity 50%
Outdoor
Summer 97
winter 29
grain of moisture 51
temp. range high
House is 1731 square foot.
I'm thinking I need a 4 ton.
manuel j says 2.5 tons on his and 3 ton on mine
Should I go with manuel J by HVAC computer systems as gospel? Then 3 tons would do it.
All professional opinions are appreciated as this is driving nuts not knowing what is correct

[dash]

You need to look at answers to all your previous posts,the Carrier info. the method to adhust the info. for 70° indoos ,etc. etc. it's all there.

Question,why do you want 70° indoors?

[dan sw fl]

Originally posted by flajoker
Looking on spec. chart it shows a total of 34,600 btu for set up.
.. Deduct 835 btu sensible capacities for each degree under 80.

/.. Manual J my ac guys did came up with 30,752 sensible and 2070 latent...32,822 total . Loss 31,740

Design: indoor summer 70
Summer 97
House is 1731 square foot.
I'm thinking I need a 4 ton.

... manuel j says 2.5 tons on his and 3 ton on mine
Should I go with manuel J by HVAC computer systems as gospel? Then 3 tons would do it.

What's up with this Math ?

3-Ton will provide ~17,000 BTU Sensible
after derating to 70'F
based on the STATED derating rule

_ 34,000 Total
~ 25,160 Sensible ... Latent 8,840 BTUh at 80'F
_ -8,350 .. 835 x 10'F ...Derating Rule
16,690 BTUH

[flajoker]

Dash...us fatboys gotta be cool

Dan, now I'm really confused. Why does manuel j even give a tonnage size? Doesn't it use the design criteria that you input at the beginning?
Did I state the derating rule correctly?
Where did you find 25,160 sensible for the 3 ton set up?
I can find it for gas furnace set ups, but not electric.
I'm not an ac guy so I'm trying to learn and read these charts as I go.
Like I said in earlier post, I'm not here much in the summer,so while I have the time am trying to make sure I have the correct size unit.
I know Dash said in an earlier post to try to bring the house effiency to the unit. I'm not sure where I can get much more out of the house.
Am I a 1/2 ton short or full ton in yall's opinion?
If my ac guys are right in their unit selection, that great.
I just need to prove it to my self with the correct data.
But if they are wrong, I need them to correct it.
I also need to be able to prove it to them with the correct data.
Either way I just want to be able to talk intelligently about it.
Thanks for your help, flajoker