central air pressures

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  #1  
Old 06-24-03, 05:57 PM
jjoe
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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??
 
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Old 06-24-03, 06:33 PM
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Gas

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.
 
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