High discharge temp

[SteinarN]

You have roughly 50C condensing. Air on/off is 28/38. This indicates the condenser is either to small or dirty or both.
A good condenser should ideally acheive roughly 38C/1350kPa discharge at 28C air on/ambient. If you had such HP conditions the discharge temp would be reduced to roughly 85-90C.

Edit:
The suction pressure could ideally be slightly higher as Nike sugests, say 430 to 460kPa. Higher suction pressure would also cause a decrease in the disharge temp.

[Gary]

You have roughly 50C condensing. Air on/off is 28/38. This indicates the condenser is either to small or dirty or both.
A good condenser should ideally acheive roughly 38C/1350kPa discharge at 28C air on/ambient. If you had such HP conditions the discharge temp would be reduced to roughly 85-90C.

A dirty condenser would give a much higher air off temp given the high condensing temp.

Overcharge backs liquid up into the condenser, reducing its effective area... so in effect this would give the appearance of an undersized condenser.

Edit:
The suction pressure could ideally be slightly higher as Nike sugests, say 430 to 460kPa. Higher suction pressure would also cause a decrease in the disharge temp.

Once the excess refrigerant is removed, the suction pressure will drop and the superheat will increase, clearly indicating a high side restriction (plugged drier, kinked liquid line, restricted cap tube, etc.).