Sabado, Hulyo 18, 2015

Thru-Wall 220v Unit Having Trouble Cooling

So, the issue started today. I'm I.T. by trade, and am familiar with troubleshooting procedures of hardware/software - not so much with AC units but here's what I checked, found, and a little bit of a description of the installation to give those willing to help a better idea of what I might or might not commonly have issues with.

Make: Kenmore
Model: 580.75281700
BTU: 27,500

So, first of all I noticed that the unit wasn't cooling like it normally does so I opened the front and checked the filter. It was expectantly clean since we do keep that up. There was a little built up ice on the right side on something like the 3rd and 4th tube from the bottom. I went out and checked through the side vents to see if I could see frost or something or anything related to a freeze up and there wasn't any frost, likewise and expectantly there wasn't any condensate either.

The unit is installed through the wall but is under a porch roof so it never has to really contend much with rain, snow, etc..

I turned the unit on and went back outside to check the airflow across the coils and it seemed to be ok. It wasn't spectacular but I don't really have anything else to compare it to either. All the blades are on the fan, and it appears to operate with little effort.

I decided turn the unit off and spray out the rear coil. Got a little dirt, nothing much more, no change to the issue over-all, nor was I expecting any change imparted by my magical hoseing off but I figured I would mention it.

The compressor does kick on. I'm not sure if there is a safety switch or anything close to the automotive equivalent that will not allow the compressor to engage unless it has enough refrigerant but that being said, the compressor always comes on. I can set the thermostat higher to about 89 and it'll go off, lower and it comes back on. So I know that the issue isn't thermostat related.

With all the easy-mode residential DIY possibilities covered (as far as I'm aware) what are the possibilities to the problem I have and likelihood that I'll even be able to find someone to fix a sealed system? Do people even do that much anymore?

I more-so want to be at least simi-educated with regard to what it could be so when I call an HVAC guy he doesn't try to throw me a line about some problem that it could never be.

Thanks for the help!

-D

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