Carrier A/C unit not staying on

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  #1  
Old 05-28-15, 11:06 AM
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Carrier A/C unit not staying on

Hello,

I have a 4 ton Carrier unit that is over 20 years old. Besides obviously replacing it because of its age, I was wondering why its doing what its doing...

The a/c is blowing through the vents but not very cold. I look at the unit outside and the unit turns on for about 15 seconds and then shut off. It repeats this periodically. I replaced the filter but it did not help. Someone told me the compressor must be burned out since an A/C that old doesn't have low/high pressure sensors.

Also im in NJ. One repairman told me $3800 for Rheem and $4000 for a Carrier (4 ton each). That seems cheap. Should I be concerned?

What are your thoughts on the cause of the problem and solution?
 
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Old 05-28-15, 11:10 AM
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Depending on the model # it could have high and low pressure switches.
 
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Old 05-28-15, 11:28 AM
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Thank you for your reply. The Model is 38ED048300
 
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Old 05-28-15, 11:51 AM
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Should call a AC tech to check the charges first. low charge can cause short cycles.
 
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Old 05-28-15, 02:03 PM
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Can't find anything on that unit. Can you post a close up pic of the wiring diagram?
 
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