High side line on A/C unit is cold, with ice accumulated, low side isn't.

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  #1  
Old 07-19-10, 11:28 AM
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High side line on A/C unit is cold, with ice accumulated, low side isn't.

Had an A/c that wasn't cooling. I went up on the roof and found that the high side line was cold with accumulated ice, (heavier closer to the unit). Low side wasn't cold at all. What's going on here? It runs R22. Thanks for any help...
 
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Old 07-19-10, 02:16 PM
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Is the high side the big insulated pipe ?
 
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Old 07-19-10, 02:59 PM
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sounds like a blockage. you can determine where the blockage is by seeing where inside the unit the ice starts to accumulate. probably right after an in line filter.
 
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Old 07-19-10, 04:56 PM
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The high side(high pressure) is the small line which shouldn't even be sweating, much less icing. The low side(Big line) which should be sweating isn't. I'll check on that blockage ender2272, thanks for the quick reply!
 
  #5  
Old 07-19-10, 05:19 PM
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dryer is restricted if you feel a pipe temp difference grabbing both sides..the liquid is coming off the bottom of the condenser and heading to the evap.the reason you don't feel cold on the insulated line back is the restriction is limiting the flow...tech guages should show an excessive hi head for the days temp.dryer has to be replaced
 
 

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