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Code "EC" means that the unit is low on Freon,, it will need to be charged, and also figure out why it's low,, allot of times the copper line connections need to be tightened.
The air conditioner should be big enough. It is hard to say whether or not the 46-47 degrees is right as you did not give a room temperature. The first thing to do before installing a used unit is to thoroughly clean it. Use your garden house to rinse both the evaporator and condenser coils. Also ensure the filter is clean. If the unit is still not cooling properly it likely needs a shot of refrigerant. Beyond cleaning the unit I would not recommend other do it yourself fixes.
A squealing noise is most likely the bearings going bad in the blower motor. This will slow the motor down. If the blower is not operating at the proper speed this will affect the temperature pressure relationship of the refrigerant. This will cause the unit to put out the wrong temperature. Running the unit to long under these conditions can possibly cause further problems ( including a very high electric bill). I recommend that use do not use this unit untill it is repaired or replaced.
Good luck.....
The simplest way of explaining this is as per the following. On your outdoor compressor unit there should be two pipes, one smaller diameter [high pressure] and a larger diameter pipe [low pressure]. Turn your A/C on inside the house and then shut off the smaller diameter pipe. Run the unit for a around 3 to 4 minutes and then check if the cooling is reducing from the unit inside the house. When you feel room temperature air [not cool] being emitted from the indoor unit shut off the larger diameter pipe and turn off unit. Isolate electrics, disconnect A/C piping and immediately seal the piping with good quality tape to prevent egress of dirt. When re-installing a quick purge of gas is usually only required to clear the lines if they were sealed properly and kept clean. Ideally running a vacuum pump is recommended but if care was taken then it may not be needed, as in many of my installations.
Low voltage shorts can be a real pain to find!!! i would try a process of ellimination: first i would try to elliminate the thermostat. then id look for a wire that is vibrating on something in the cabinet.
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