If you have a set of gages all you have to do is hook up to the ports. Blue gage / line to the large tube. Red gage / line to the small tube. Hook up ports are usually right at the bottom of the unit where the tubes connect to the unit. On some, the ports are inside the unit in which case you have to remove the access panel in that location. First, clean the outside coil, you can use a water hose with not to much pressure and wash out any leaves, dirt, old grass clippings. Wash out the coil fins and pay attn. to the bottom area. The best way, to make sure your unit is full of freon, is to check the temp of the large line at the unit (while it is running w/ max load across inside coil) and check the saturated refrigerant pressure, looking for a differential of 15 to 20 dges. OR With a clean coil, running with about 225 psi on the red gage, you will want about 65 to 70 psi on the blue. These numbers are just for referencing only.You really need to check the temp. of the suction line and using a saturated R22 pressure to temp. chart. (found at any local refrigerant supply house) adjust pressures and temps until a desired temp. is achieved (15 - 20 ) called super heat at the compressor suction line. Hope this helps Fix Ya up.
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If you have a set of gages all you have to do is hook up to the ports. Blue gage / line to the large tube. Red gage / line to the small tube. Hook up ports are usually right at the bottom of the unit where the tubes connect to the unit. On some, the ports are inside the unit in which case you have to remove the access panel in that location. First, clean the outside coil, you can use a water hose with not to much pressure and wash out any leaves, dirt, old grass clippings. Wash out the coil fins and pay attn. to the bottom area. The best way, to make sure your unit is full of freon, is to check the temp of the large line at the unit (while it is running w/ max load across inside coil) and check the saturated refrigerant pressure, looking for a differential of 15 to 20 dges. OR With a clean coil, running with about 225 psi on the red gage, you will want about 65 to 70 psi on the blue. These numbers are just for referencing only.You really need to check the temp. of the suction line and using a saturated R22 pressure to temp. chart. (found at any local refrigerant supply house) adjust pressures and temps until a desired temp. is achieved (15 - 20 ) called super heat at the compressor suction line. Hope this helps Fix Ya up.