ONLY THE MIDDLE of the evap.is getting. low pressure is pegging the needle
SOURCE: PTAC UNIT QUIT WORKING
If you have a clamp tester, operate the unit with the clamp tester and check the current reading. If the current reading is normal but the reset button is tipped then there is something wrong withe power plug reset button. But if the current reading is higher than the name plate rating then there is something wrong with the unit.
SOURCE: Zoneline PTAC short circuit
Most likely you will need to either replace transformer or there may be a low voltage flat type "car fuse" usually 3 amp or 5 amp for just such an occasion. Good luck!
SOURCE: how do i charge a AMANA Ptac with R22 freon
Also, if you get caught working on ANY freon based refrigeration without a license, you could face a large fine. Freon isn't $3 per pound anymore, it's quite expensive and you don't want any of it wasted. Have a licensed technician do the work. He will know exactly how much refrigerant your system needs, and he can remove what's there and add to it.
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