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Not sure if you are heating or cooling.... but either way if the unit is not getting the proper air temperature and it is continuously running then the first thing I would look for is a freon leak...the unit is undercharged and the leak needs to be fixed and then the unit charged correctly...
From the model number of the unit I think it is an older unit and straight A/C ... if the indoor temps. are 80 or more the 64 could be okay... but if the indoor temps are in the mid 70's then it is under achieving...
You should get 15 to 20 degree temp. drop across the coil...
Hello.I think they are on to something with shortcycling on temp sensor.I think it should be sampling the return air instead of (inside coils ?).A 2*f dead band use to be built in (factory installed) to thermostats to prevent on/off, but not sure in this case.Try a new sensor location(return air) and see if anything changes.
No it means you 50 degree one is working better than perfect. Clean the one that is only getting down to 60 degrees but remember if a unit is dropping the air temp by 20 degrees its working fine. You ck this by cking the air at the intake where the filter is say temp is 80 degrees and then take a reading at a discharge vent where the cold air comes out if its 60 you have a 20 degree drop and that is considered good. If the unit was low on freon the unit will freeze up (ice will form on the inside coil).
The pressure changes with temperature, it is not a true gauge to ensure a proper charge.
You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)
Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)
it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.
( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)
Depends on your Tstat. The set point is different from room temp. My tsat show set point and room temp. But to answer you when you set at 72 and room temp is 75 . It will go back to room temp till you reach that temp. Rusty