I changed out my condensing unit, (a very used Goodman 10 seer), with a Nordyne 13 seer, and, the evaporator coil on the horizontal natural gas furnace with a Aspen 13 seer expansion valve cased coil.
The condensor sits on the ground level and the ecoil is in the attic approx. 16 foot above the cond. unit. I relocated the line set to make an arc about a foot above the highest point of the ecoil case to stop off-cycle migration.
I installed a 16 cu.in LL filter dryer at the ecoil and a sight glass at the cond. unit.
Upon start up and charging system, in order to clear the glass it produced 95 psig suction with 275 head pressure with a very warm liquid line.
I adjusted the charge to 175 head pressure which only resulted in lowering the suction to 80/85 psig, while flooding the compressor very badly !
I adjusted the charge until the compressor was not flooded and the suction was in the 75/80 psig range but the suction line was not sweating back nor was the condensing cycle producing sufficiant removed heat out of the top of the cond. unit.
The ecoil is a universal refrigerant use coil and I did check the valve to make sure it was a R-22 valve and yes it is, (green tag).
My theory is that the sensing bulb has lost its charge, (coming this way out of the box), and the valve is stuck in the wide open position. I know of no way of proving this except to change the valve.
btw, I am a technician with over 15 years experience in new install and retrofitting equipment, and this is on my own home.......
Any suggestions or comments before I go to the parts store and request a "loaner" valve to prove my theory ?
Thankx in advance,