Freezing Suction LIne

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  #1  
Old 04-01-03, 04:42 PM
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Freezing Suction LIne

I have a new house with a 10 SEER Rheem with an electric strip heater. AC appears to be a cap tube system, don't see evidence of TXV. Haven't removed the panel to see if it has a scroll compressor.

The suction line is frosting/freezing after about twenty minutes of cycle time. I see minimal or no frost as it exits the evaporator, but it is quite frosty where it exits the house and runs to the condensor. Seems to be heaviest nearest the compressor, inside the cabinet.

Cools well, but I know this is not normal and can cause slugging over time, so I want to get the contractor out to check now. It appears to cycle normally.

There appears to be good air flow over the evaporator, so I am suspecting low or high freon charge. Have new, clean filter, and the unit is brand new.

Any other thoughts before I call the ac man?

Thanks
 
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Old 04-01-03, 05:09 PM
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get the installer

back out. probably low charge, may have been started up on a cold day, hard to get the charge right with low ambient temps.
 
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Old 04-01-03, 05:55 PM
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You are right, almost positive that ambient temps were low at time of installation

thanks

USA 1 !!!!!!!!!!!
 
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Old 04-02-03, 09:50 AM
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OK,

AC tech came out, put gauges on system, used ambient air temp vs. the chart on the unit, and said the pressures are right in the middle of the acceptable range.
Unit does have scroll compressor, if that matters. He said it was "normal" for frost to form on the suction line with low outside and inside temps.

When he checked it, OAT was about 72 F with relative humidity about 60%, and inside was about 68 F.

Evaporator coil was clean, as was filter.

What do you think? Should I be concerned, or will God take care of it when it gets hot again?

Thanks
 
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Old 04-02-03, 11:23 AM
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A/C

You say new home. tech said all pressures where good. You say no frost at the evaporator but frosty where it comes out of the home. Just for kicks can you look at the line there and see or feel if you could have a kink in the suction line there where it comes out of the home and it is working like a metering set up. I have had this happen ED
 
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Old 04-02-03, 04:18 PM
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from what is visible outside the exterior wall, there are no kinks.

You've been around skilled artisans also, haven't you ??

thanks for the suggestion
 
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Old 04-02-03, 04:39 PM
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Low Charge

With no visable kinks to cause a restriction your looking at an under charge, perhaps a leak.

What's happening is: the "frosting" should happen in the evaporator. But being under undercharged it's happening way down the line (at the condensing unit).

Take superheat/subcooling readings. And adjust the charge. Don't forget to find the leak.
 
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Old 04-02-03, 04:58 PM
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Indoor temp was a little low to get a good reading. I actually wouldn't worry about it just yet. Even if you have some kind of trouble, you won't screw up that compressor. As it gets hotter outside, the problem may go away or it may manifest itself.
Keep an eye on it.
 
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Old 04-03-03, 11:44 AM
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Originally posted by brwalker2001
from what is visible outside the exterior wall, there are no kinks.

You've been around skilled artisans also, haven't you ??

thanks for the suggestion
I have had some of them work for me ED
 
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Old 04-03-03, 12:36 PM
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What, me worry?

Me too. And now they are employed elsewhere (hopefully in another line of work). Their mottos are things like, 'Can't see it from my house', 'Good enough for now', 'Home of the callback', and my favorite, 'I just work here'
 
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Old 04-04-03, 04:02 PM
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Wait a second

Frosty where it comes out of the home.

Is there any insulation on the suction line between the house and the unit?
 
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Old 04-06-03, 06:31 PM
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the suction line has the foam wrap insulation from the evaporator until it reaches an elbow near the condensor.
 
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