Need help with Rheem RENB 1005 A/C

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  #1  
Old 06-04-18, 03:22 PM
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Need help with Rheem RENB 1005 A/C

I have an old A/C, Rheem RENB 1005. The AC is running since 8 am, and at 6 pm, the temperature is still 85 degrees in the condo. I am located in Miami, on the top floor, 5th floor. The blown air is cold, but not cold enough.
What could be the problem?
 
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  #2  
Old 06-04-18, 03:35 PM
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Take a temperature reading at the supply duct at the furnace and at the return duct. Let us know.
 
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Old 06-04-18, 04:58 PM
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Sorry, I'm a beginner. What device should I buy to read the temperature? I'm not sure about the location of the ducts. There is a duct that blows cold air in the living room, one in the bed room, and below the filter of the furnace. Are there the right locations?
 
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Old 06-04-18, 05:54 PM
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First off, what kind of system do you have? DX split, chilled water, water source heat pump, something else?
 
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Old 06-05-18, 08:21 AM
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I don't know what kind of system I have, but I removed the covers and here is a picture of it.
 
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Old 06-05-18, 08:27 AM
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Ok that looks like a DX system.
Take a temperature reading across the evaporator coil.
 
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Old 06-05-18, 08:46 AM
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I only have an oral thermometer. Is that good for temperature reading or should I buy something else?
 
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Old 06-05-18, 08:49 AM
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You’ll need something else.
If you don’t have any tools you may want to call someone. That’s a pretty old unit and you may be dealing with a refrigerant charge issue.
 
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Old 06-05-18, 08:54 AM
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What device should I buy to read the temperature?
I'd prefer to try the maximum myself before I call a technician.
 
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Old 06-05-18, 08:57 AM
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At least a cooking thermometer.
Something with a decent scale.
 
  #11  
Old 06-06-18, 12:24 PM
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Yesterday, it was hot outside and the temperature inside was 87 degrees at some point, while the AC was running for many hours.
I bought a Weber cooking thermometer. Here are the temperatures (today is less hot outside):
AC thermostat set to 82.
Evaporator coil: 75
Living room duct: 71.5 average air flow.
In the living room, away from duct: 82.5
Bedroom duct: 75, weak air flow. In the bedroom, away from duct: 84.3
Kitchen duct: 75, strong airflow. In the kitchen, away from duct: 81.5

The kitchen is the only room with a good enough temperature.
Please let me know what you think the problem is.
 
  #12  
Old 06-06-18, 12:32 PM
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Your getting 75* supply air? Either your units not running or it’s got a refrigerant charge issue.
 
  #13  
Old 06-06-18, 08:15 PM
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Yes. So should I call an AC technician or is there something I could learn to do myself?
A few months ago, I learned successfully how to recharge AC on my car. Is recharging home AC possible to learn or should I call an AC technician?
Thanks again.
 
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Old 06-06-18, 08:40 PM
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The rules on this site do not allow instruction on charging equipment, as refrigerant is a regulated substance.
Is the condenser running?
 
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Old 06-07-18, 07:45 AM
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Is the condenser located on my picture? If yes, please let me know where it is, and how I should check it.
If it is located on the roof, I prefer to call a technician. I live in a condo.
 
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Old 06-07-18, 08:05 AM
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It will be outside somewhere. Working with it may require a meter and working with live high voltage.
 
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Old 06-08-18, 08:07 AM
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An AC technician came, he went to the roof and added freon, he charged me $150. He told me that my AC unit is more than 25 years old and needs to be replaced. Here is a picture of it on the roof. It would cost me around $2000 to replace it he said. I asked about the fact that we sneeze when the AC is cold. He told me that the building insulation system is old and nothing can be done about it. Do you know another way to fix this sneezing problem?
 
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Old 06-08-18, 08:21 AM
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Your equipment does appear old and isn’t in the best of shape.
If the leak wasn’t found then the refrigerant will leak back out again. Refrigerant isn’t consumed while the unit is running. It’s a closed circuit.
I don’t know why sneezing is related to the operation of your air conditioner.
 
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