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Old 03-19-2012, 03:34 PM   #11
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Lot of good info, thanks.

Our Pinnacle is only 4 months old, so the A/C unit should be in good shape, it blows real cold air.

I was thinking low air flow may be the cause, I did clean the intake filter.

I did notice some leaking of cold air back into the return, I will get that sealed up.

I know the rear unit will run all day without freezing up, but it also has two ducts connected to it, the front only has one duct connected to it.
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Old 03-19-2012, 04:28 PM   #12
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Every time we've had this problem has been when the filter is dirty and clogged. Filters need to be cleaned or replaced more frequently than you think.
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Old 03-19-2012, 05:11 PM   #13
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This is all good info to have.
The weird thing is our air conditioner was brand new when it iced up, so the filature was clean, it was a roof to unit with no ducting as well.

But since we re getting a new unit.. I will post these recomendations on my owners manual so we can save time and headache in the future.
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Old 03-21-2012, 08:49 PM   #14
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Ditto Crackshot.

A properly maintained AC that freezes is low on freon. Do the maintenance, see what happens. You could also stick a thermometer in the vent of a working AC, and compare to yours when not iced. A "normal" system blows around 45 to 50 degrees (in my experience).
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Old 03-22-2012, 06:53 AM   #15
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Quote:
Originally Posted by RustyFairmount View Post
Ditto Crackshot.

A properly maintained AC that freezes is low on freon. Do the maintenance, see what happens. You could also stick a thermometer in the vent of a working AC, and compare to yours when not iced. A "normal" system blows around 45 to 50 degrees (in my experience).
The AC in your car will blow 45 degrees. but if a rooftop is doing that, I will guarantee the evaporator temperature is below freezing and it's going to ice up. A properly charged unit, properly ducted and with no air restrictions will have discharge air in the 56-60 degree range, and you still have to go by the split across the coil.
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Old 03-22-2012, 09:06 PM   #16
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Really good point. I usually work on automotive units. The principle still applies. Test and compare against a similar unit.
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Old 03-23-2012, 06:50 AM   #17
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I have been told to make sure the side discharge grills on the filter holder are always closed except for the initial cool down and not to leave them open long if you have ducted air. This cold air will be pulled back into the unit through the filter and potentially freeze up. Besides, the unit is quieter with them closed anyway.

I just leave mine closed all the time and I have never had a freeze up problem with either unit.
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Old 03-31-2012, 11:06 AM   #18
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I fixed our problem...

Our AC was freezing up also. It turned out that a temperature sensor (turns off the compressor when the coils would ice up) fell off. It was a clip-thingy (technical term) that attached to the coils (flat plates) that the air blew across. when I attached it, the unit would cycle, getting cold but not icy, then the compressor would cycle off (leaving the plate still cold, but not ice) and we got constant cold air. Simple fix, I had the filter off several times before I noticed the wire and clip-thingy (technical term) hanging off in the corner of the unit.
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Old 03-31-2012, 02:37 PM   #19
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Welcome to the JOF, jstme1. Stop over to the New Members forum and say Hi if you'd like.
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Old 06-27-2012, 07:02 AM   #20
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Well we solved our Front A/C Freezing up problem.

I extended the left duct toward the front closet and added a vent and added a duct on the right side and installed a vent.

Air flow is much better, unit does not freeze up, runs a lot quieter than having to the keep the "Quick Cool" vents open to prevent the freeze ups.

Also the unit is able too cool the front area much better and the A/C unit cycles on and off like it should and maintains a more constant temperature.

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