Home A/C not cooling

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  #1  
Old 07-10-16, 10:35 AM
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Home A/C not cooling

The temps outside has been arounfd the 98 degree mark. My house is staying in the 90's inside as well. Started by setting thermostat on 68 never got below 89 inside. I upped it to 78 still never cooled down. When it read on the thermostat that it was 91 I set to 91 figuring if it got below that it would kick on the ac to keep the temp from going higher.

Stayed that temp so I decided to try setting it at 86 allit did was make the temp in house go up instead of down.

Checked the 2 lines coming from outside unit. One is very hot and one is wamd no sweatness or condensation. Installed new filter inside so it is clean.

Air coming out of vents is 73 any ideas?
 
  #2  
Old 07-10-16, 10:51 AM
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You need to go outside and check the outside unit. There are two main components in the outside unit: the compressor and the condenser coil and fan. When the thermostat is calling for cooling, both the compressor and condenser fan (fan on top of outside unit) should be running. Check to see if the fan is running, and try to listen for the compressor. Do you have a multimeter? It may prove useful in troubleshooting the system.
 
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Old 07-10-16, 10:52 AM
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Are you getting good airflow out of the vents? According to your tempertures you are getting a 17* Delta T which is good.
 
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Old 07-10-16, 04:08 PM
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When I returned from a trip, house temperature was 86. Started AC. Temperature dropped only a few degrees for several hours. Apparently, AC was removing moisture, not heat for the first several hours.
 
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Old 07-10-16, 04:37 PM
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You need to verify the outdoor condensor activity.

Fan and compressor running ?
Fan only running ?
 
  #6  
Old 07-11-16, 06:30 AM
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Could be very low indoor airflow...along with a lot of hot humid air infiltration into your home which keeps the evaporator coil using most of its capacity to handle the latent load, therefore, it can't reduce the sensible room temp.
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All the ductwork & Return-Air Filter area issues need to be effectively dealt with first...!

Simple easy anyone can do ways to check the performance of your central air conditioner so, you can call an Energy Efficiency HVAC Technician to get the various problems revealed, fixed.

You can run a ballpark analysis of how your system is performing in respect to its 'Nominal Rated Btuh' you need at least the following numbers:
Performance Data Collection – Best Time to collect data is Late afternoon around 4:30 pm, when attic is HOT; also when outdoor temps are around 80; 85; 95; or higher.

1) Helpful; Tonnage & SEER or year Mfg'ered or bought the outdoor condenser Make & model number: ___________

2) TXV or, orifice metering device? __________. Only if U know…

3) Outdoor condenser’s discharge-air-temperature ______-F

Subtract Outdoor air temperature:_______ = _______ Condenser Air-Temp-Split ________
4) Need the ‘Indoor’ percent of relative humidity - away from Supply-Air outlets _________
Walmart has very low-cost ACU-RITE digital humidity & Temp monitor - every A/C User should have one!
5) Indoor Return-Air Temperature ______

Subtract Indoor Supply-Air Temperature ______ -F

Indoor temperature-split _______-F

Click; Reply With Quote: Reply with quote - with filled-in data.

We Need the above information for troubleshooting & ballpark performance analysis.

A TECH should check the blower wheel blades & evap-coil for possible lint build-up; then, perform static pressure reading & compare to the blower chart or graph to check for proper airflow CFM through the evaporator coil. If a new system they will be clean.

Adequate indoor airflow to & from all rooms is extremely important to heat removal performance & other temp-data readings; the indoor coil needs to be adequately heat-loaded for optimal performance.
 
  #7  
Old 07-11-16, 04:45 PM
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It is fixed. Turned out the coil on the outside unit was dirty and it was low on Freon. Blowing nice and cold now.
 
  #8  
Old 07-11-16, 07:06 PM
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I'm betting there is more wrong than that & that it is still below par.
Fill in the numbers on a hot day & let's see how it's doing.
 
 

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