Ok, I have a 30 kW office air conditioner with a hermetic compressor, air cooled, operating on R22.

The following readings were taken of the condensing set:-
Suction – 440 kPa
Suction temp 20.3°C (at comp suction service valve)
Discharge Pressure – 1950 kPa
Discharge Temp - 75°C (at comp discharge service valve)
Liquid line temp, before tx valve (located in the condensing set) 44.8°C
Air on condenser - 32.8°C
Air off condenser - 47.3°C
Evap air on 24C
Evap air off 14C



Firstly, IMO suction and discharge pressures appear relatively 'normal' to me (happy to be told they are not). This is why I went further and got more readings.


What can be gathered from these readings? I am fairly comfortable saying that the superheat appears too large. This could be TX valve setting or more likely gas charge (based on not fiddling with TX valves first).


But what about the discharge temp at the compressor and the liquid line temp. What can be gathered from these?


Your insight would be greatly appreciated.