2nd qt./ 4th qt.??? what is that??? Regardless, a 1/4" line is too small. It will work but not as designed, not as efficient.
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Talk with an ac specialist professional
generally 1/4 " is acceptable for distances of up to 10 ft and for longer it would be 3/8 " to 20 ft and possible 1/2" for over 20 ft
It all has to do with the flow restriction of the liquid and if the tube is too small then the evaporator is starved of liquid to convert to gas
At this point I would suggest that the 3/8" line would be more acceptable but as I said , talk with the professionals as to the on site situation
SOURCE: Evaporator Coil
Yes, just count how many pins per inch and replace with the same number of pins per inch.
SOURCE: High side low side pressures don not respond to freon levels
Chances are you have a TXV already installed. Thats why simply adding refridgerant is not effecting the pressures.
All you are doing by adding refridgerant is overcharging the unit, and possibly forcing the compressor to try to pump liquid instead of vapor. Not god for the compressor.
If the vibration noise is your only problem, I would try emilinating the vibration.
Find where the lineset is touching other parts of the house and install vibration dampening opads there. If the airahndler is mounted to the structure of the house, install vibration reduxction pads there too. If it is suspended from the floor joists you may have to change that mounitng method.
You can suspend the drain overflow pan and then set the unit in that on dampening pads, or set it on blocks from the floor/crawlspace.
Check your data sticker to find out how many pounds of refridgerant the unit takes.
By now, you are probably way overcharged.
SOURCE: 2 TON WEATHERKING HEAT PUMP VIBRATION AND NOISE.
Your friend is correct. Installing a sump or p-trap in the suction line will probably help. The oil may be leaving the compressor but can't get back.
SOURCE: What wire size do I run for a 3 1/2 ton AC unit?
it depends on the distance from main power source # 8 if more than 40 feet look at starting amps then google a wire sizing voltage droop chart
SOURCE: Compressor freezes up at night and some during day.
You are being ripped off. The ambient (outdoor) temperature at night is low and therefore proper condensing does not take place causing the refrigerant to pool in the condenser and starving the evaporator. This causes a lower temperature in the evaporator resulting in "freeze up" which is often mistaken for a loss of refrigerant.
The proper thing to be done is to block off the condenser air causing the high side pressure to rise until the eqivillant of 110*F condensing temperature.
You can also install a low ambient kit which will cycle the compressor off when the temperatures fall
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