Goodman RH30-08C (?) System not cooling.


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Old 05-10-14, 08:43 AM
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Goodman RH30-08C (?) System not cooling.

Had pretty old system cleaned and R22 recharged with new seal caps installed last May. System ran like a champ for a very hot summer, heated very well for all the winter except a couple of really cold weeks (I attribute that to poor house insulation and single pane windows in an old Florida cinder block house). Then as spring came in, we had a hot spell for a week with temps in the 80's and humid... just like it was turned off, the system stops cooling. Just fan blowing air around. The t-stat seems to be turning things on and off if I set it accordingly, but it's hard to tell if the heater is still working when it's 85 degrees inside.

I have an electrical background and have successfully replaced electronic parts on the system before (transformer, thermostat, fan motor on the handler), but not a certified AC tech.
Is this an electrical problem with the condenser not turning on or Freon not flowing - or could I have lost the charge again?
 
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Old 05-10-14, 08:58 AM
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I should just say it's an old Goodman - the RH30-08C may be wrong, it's pretty hard to read.
 
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Old 05-10-14, 09:00 AM
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Needs more freon. Once you start adding freon, you have to add it again every year.
 
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Old 05-10-14, 09:12 AM
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Really ? Did not know that. So it will just stop "suddenly" when it was cooling fine the day before ? Was hoping for something I could fix... And this will be a regular problem until I replace the system ? How much is too much for an "average" system, and can I replace just the outside unit ?
 
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Old 05-10-14, 09:41 AM
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I would open the panel a look for burned wires or swollen capacitors.


Measure for 24 volts to the contactor coil and 240 volts at T1 and T2.




If everything looked good, I would turn off power and measure the capacitor readings.
 
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Old 05-10-14, 09:54 AM
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This I can do... will let you know what I find - Thanks.
 
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Old 05-10-14, 11:06 AM
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It all seems well with voltages and appearance of components, although I noticed the condenser is very warm after running for about 15 minutes.
 
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Old 05-10-14, 11:13 AM
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Compressor runs, suction line not cold, condenser air discharge not warm ->> Most likely refrigerant issue

Compressor not running = electrical problem
 
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Old 05-10-14, 11:29 AM
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Is there such a thing as a R22 quick recharge kit for a home system (like the ones you can use on auto AC) ??
 
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Old 05-10-14, 11:52 AM
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No, you need to be EPA licensed to purchase & use R22. Years ago they used to sell home recharge kits, but not anymore.
 
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Old 05-10-14, 11:56 AM
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Thanks for the help and answers - ya'll have a cooler day than I will...
 
 

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