I recently bought a one level ranch home built in 1988. I want to change the air filter which seems like it would be located under the house where the HVAC unit is located, but I cannot find where the filter is on the unit? When I recently went under the house, I checked out where this may be and was suprised to see a filter laying next to the unit! From where I could reach, I could not find where this could have come from? To describe the unit, it is a grey box about 6' long x 2' wide. There are 3 ducts coming off it as well. I cannot see a product id #, model name/#, etc. Does someone have an idea of where this filter came from?????
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There are alot of factors when dealing with this problem. Heat Load ( Typical A/C unit is designed with a split of 20 degrees farenheit.) If you measure the temperature leaving the discharge registers, the temperature should be around 20 degrees colder than the air entering the return air grille (Filter Location). Also your unit seems to be a 3 ton; In which this system is designed for roughly 450 sq. ft. per ton and can go as high as 550 sq. ft. on newer homes with more than adequate insulation values. On older homes with minimual insulation the 400- to 450 sq.ft. rule per ton should be observed. Another reason could be that the units needs servicing like a dirty condenser coil or evaporator coil, improper refrigerant charge, etc can all be issues that can result in your problem.
Finally, most typical units or designed to maintain a home 20-25 degrees below outside temperature. Example 95 degrees outside, inside should not be set lower than 70 to 75 degrees, and the 5 degree range depends on the SEER (Seasonal Energy Efficiency Rating/Ratio ) of your unit. Hope I was helpful in giving you some direction in things to look for to resolve your problem.
You currently own a 2.5 ton AC Unit
500 square feet equals a ton of cooling/ you need a 3.5 ton unit.
If your home is well insulated, good windows and doors and pretty good
shade that covers your house, then I can see a 3ton unit cooling your
Thats another 6,000 btus you do not have and that is a best case for a
energy effcient home.
If you are referring to the secondary pan there could be a problem with your drain line.i would find the drain at the exterior of your home and **** it out with a wet vac..most A.H.Us have float switches or moisture sensors.They will shut down the unit if the drain clogs.
NO FILTER IN A PACKAGE UNIT EVER AT ALL AT ANY TIME. YOUR FLOOR GRILL FOR RETURN AIRT IS ALWAYS YOUR ONE AND ONLY FILTER LOCATION. YOU MAY HAVE A VERY DIRTY EVAPORATOR COIL ON THE INTAKE SIDE WHICH WOULD CAUSE POOR PERFORMANCE AND POOR AIRFLOW. HAVE AN AC CO COME OUT AND REMOVE THE LID AND INSPECT OR WASH THE COIL. YOU MAY ALSO BE LOW ON R22 . HAVE IT CHECKED WITH A GAGE. AS A GENERAL RULE PRESS LESS THAN 40 POUNDS EQUAL LOW CHARGE OR DIRTY COIL. 65 TO 70 POUNDS FAIRLY NORMAL. IT NEEDS TO BE 70 TO 80 DERGEES OUTSIDE AND INSIDE TO REFLECT THESE GENERAL PRESSURES. IF LOW ON R22 THEN A LEAK HAS DEVELOPED, USUALLY IN THE EVAP COIL.. BE AWARE R22 IS OUT OF PRODUCTION NEXT YEAR. STRONGLY CONSIDER NEW 410 REF UNIT BEFOR ESINKING A BIG CHUNK OF MONEY IN R22 EQUIP
If your rooftop unit is self contained with no pipes leaving it except the condensate drain line there should be a narrow removable panel to access where the filters are located. If you have three pipes exiting the roof top unit two will go to an air handler located in the attic of the home. The filters will be located in the air handler.
Check the filters inside and the evap coil to make sure it isnt filthy. The evap coil can be cleaned with a credit card if its wet. The large line outside should sweat all the way to the compressor if its got enough freon. Will freeze when its cool outside or not sweat at all if its low. Good luck with it.