I am just cornfused. Today I installed a home A/C unit and was performing subcooling and these are the numbers I got.
Out @ Cond. 85 Dry
In @ Return 55 Wet
Suc line temp 64
Lo 68 PSI
High 190 PSI
T-Stat reads 74
We installed a 3 TON system in a 1080 sq/ft split ranch.
***Now B4 you jump, I am a lowly install "tech" who is installing someone elses guestimate. My shirt is of a different color***
Now back to my cornfusion. I was with another chap who did the nitro, vac and charge. He leaves and I finish upstaris and go to check out the charge. According to my subcooling calculator it tells me to run away. Seriously, all that is in the little window is a "-" and the side note tells me not to charge as it will cause slugging. The return line 'beer can cold at the king pin. What does my measurements mean? Aside from the oversized unit, bad blagh blagh blagh.
This also peaques curiousity as to how much cooling the house actually needs. So I B.S. the customer and measure the house, walls, windows, doors and orient the house for NSEW. This is what I came up with and let me know if I am close.
Design TD Cooling 20 Degrees Heat 70 Degrees
Windows 8732 BTU's 7552 BTU's
Doors 2106 BTU's 2965 BTU's
Walls 1860.1 BTU's 4797.1 BTU's
Floors 446.4 BTU's 1051.2 BTU's
Ventilation 168.96 BTU's 591.36 BTU's
Duct Gain 3245.336 BTU's 1215.956 BTU's
Laten 690 BTU's
Relative Humidity 55 %
Total 17248.796 BTU's / 1.4373997 Tons Heat 18172.616 BTU's
My last question. Am I on the right track or am I just being to concerned? Also, if there is any more info that I can give you to help make a better informed decision, let me know.
Ok. I forgot the walls. I plugged them in and now we are correct.
[Edited by atufano on 04-19-2005 at 09:09 PM]