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Re: no cool 80 supply temp
That is a high suction pressure should be running about 46 psig and head pressure should be amibent temp or outside temp and add 25 to it. that will give you approximate head temp. sounds like you have a dirty condenser I would clean it. Check your amp draw on your compressor if its high then I would check for dirty condenser. You can clean it with a stiff hair brush go up and down do not go sideways because you can damage your fins on the coil. Then take a water hose and wash it out. turn off the power to the unit before cleaning do not clean with compressor running. turn off the breaker box. I hope this helps.
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The outside ambient temp has little effect on the suction pressure. The indoor temp is what will slightly effect the suction pressure. In the trade we say we want a 40 degree evap coil, this means approximately 125psi. This is when the indoor temp is around 74 to 78 degrees. The hotter the house, the higher the pressure. I like to see a 50 degree evaporator when the indoor temp is above 80. Charging by subcooling is the way to go!!
Usually on any 410a freon system you can use a pt chart, and for any other freons also. At 120psig yours indoor coil temp is around 40°f. You want this temp/pressure above freezing. Your pressures are going to depend on indoor/outdoor temps. Hope this helps!
EPA regulations: Freon 22 units are no longer available, Units that are compatible are available They come pre charged with nitrogen It must be dumped. If there is freon in the old system it should be pumped down into the condenser unit before the inside unit is removed, Close the high side king valve and run the unit until the low pressure reads near O Close the low pressure king valve. and turn unit off. 410A freon units are readily available. Most if not all 2 ton air handlers will work with any outside 2 ton unit though some building codes will not allow a mix. Their reason: if something fails who is to blame:
You turn system on to cool setting and run temp down until outside unit comes on. Then you connect your suction side of your gauges to the suction side of your outdoor unit. Next you connect the liquid(high)side of your gauges to the liquid line on your outside unit(the little copper line). Connect the middle hose of your gauges to the 410a drum of refrigerant. Before opening the suction or low pressure side of the gauges you need to turn the drum upside down and turn drum of 410a on. Then you need a temp reading meter and clamp to read the temp of your liquid line(small line). While charging you want to make sure to release refrigerant slowly. The unit should call for a specified subcooling on unit plate. 7 to 10 degrees. You take the liquid line temp and subtract it from saturation temp on the high side of your gauges.(it'll be the pink numbers on the right side of your gauge.
Is the outdoor fan running? The fan cools the coils and compressor, therefore keeping the high pressure low enough to run. Either the fan is not working or its not spinning fast enough. Check the capacitor, or just replace it.
Any pressure switch in the same range will work. R22 Rage about 350 cutout 275 cut in. R410A 550 cutout 450 cut in. Most F22 Head pressure ranges about 225 to 275 depending on the Ambiant temp. 410A about 350 to 425 psi. Keep in touch Johnstone supply handles Coleman evcon go to ther website or call there toll free number in your area and give them the model number and they can match it or cross it over to one that will work. Rus
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)