Comfortmaker heat pump; standard 300/150 hi/lo factory settings; R22 - 5.5lb charge
Current pressures: 300/90. I have cleaned condenser and evap coils thoroughly. Both fans working fine. Good air flow through evaporator and condenser. There are no leaks, and no icing. I have tried adjusting the charge to raise the low side pressure, but in doing so would also raise the high side exponentially. (i.e. Increase the suction pressure by 20 psi, and the head pressure would jump as much as 150 psi)
I've never ran into a problem of this particular nature where the usual suspects have all been ruled out and the problem still exists. If I had to pick something to try next, I guess I would have to start looking at the compressor. This is an older unit, probably 15 years old, and I'm not sure what to try next. Any ideas or advice regarding this problem would be greatly appreciated.
Thanks.
Current pressures: 300/90. I have cleaned condenser and evap coils thoroughly. Both fans working fine. Good air flow through evaporator and condenser. There are no leaks, and no icing. I have tried adjusting the charge to raise the low side pressure, but in doing so would also raise the high side exponentially. (i.e. Increase the suction pressure by 20 psi, and the head pressure would jump as much as 150 psi)
I've never ran into a problem of this particular nature where the usual suspects have all been ruled out and the problem still exists. If I had to pick something to try next, I guess I would have to start looking at the compressor. This is an older unit, probably 15 years old, and I'm not sure what to try next. Any ideas or advice regarding this problem would be greatly appreciated.
Thanks.
