central air pressures


Old 06-24-03, 05:57 PM
Visiting Guest
Posts: n/a
central air pressures

I have a central air unit 12 seer compressor it seems as if it wont cool the house down . I hooked up gauges and have 66 on the low side and 190 on the high. outside air is aprox 90 with hi humidity and the house is only able to go down to 78. Seems like it cooled better in the past. what should the pressures be??
Sponsored Links
Old 06-24-03, 06:33 PM
Join Date: Nov 2002
Location: Massachusetts
Posts: 1,819
Received 0 Votes on 0 Posts

Your low on gas most likely, just look at the high side you should be ambient + 30...190 is on a cool day...about 260PSI head, but with these new units they have lower head and higher backs...feel the sucktion line better yet, is it sweating back, if not she's low on gas. The return gas should be 8-15F warmer than the saturated evaporator temp. Thjis means you should have a 48F suction line with that pressure. If its higher, than your low on gas.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title:
Your question will be posted in: