R32 unit, under constant but realtively low load within system specs,
HP 22-25 bar at a ambient temp of 18°C,
Lp 5,3-5,8 bar, which is roughly where it should be.
Compressor, evaporator and condenser fan already running at maximum speed/power even though there should be headroom to operate at higher ambient temperatures and higher thermal load on evap.
Hotgas is between 80-86 degrees, liquid line sometimes feels rather hot, subcooling is, however at 10-20K
EEV is within operating range (neither fully open nor fully closed) but superheat drops rapidly when it opens, and it swings quite a bit while trying to maintain superheat at 5K
Measured superheat is roughly 1-2 K lower than what the system is measuring, but due to insulation I have to measure closer to the evap than the compressor, so I believe it could be plausible.
Compressor has low, but good looking Oil.
Product gets cooled sufficiently but at these ambient temps HP should not exceed 21bar.
Liquid line sight glass shows only liquid, no bubbles. It is, however, located below the condenser.
Evap starts freezing a good portion after the bernoulli distributor, when the injection pipes reach the evap (as it should, i would say)
Evap freezes evenly, but the last Pipe, accuumulating all the exits of the Evap has no ice on it, so it seems the flow of refrigerant through it is a little low.
Filter dryer temperature difference = 2,2K
There has been a very slight leakage at the HP transmitter. Fixed.
Condnser and Evap were very dirty. Cleaned them, still HP has stayed too high.
The evap coils are only frozen
The outside part of the unit has bad airflow due to noise insulation and positioning (in a corner, close to a dark wall, that gets really hot in the sun)
But at 18° amb it shouldn't alrdy be that high?
Do we have an overfilled unit?
Or is there leftover air or nitrogen inside due to unclean previous work?
I am new at the company so with the right temp probe I would've also checked the suction temp probe again.
Sorry english ain't my first language but I hope I could make it comprehensible.
My ideas are:
-Check HP transmitter
-Check Suction temp probe
-extract refrigerant and see how it affects pressures and superheat
But yeah, I am a bit lost. Shouldnt overfilling or unwanted gases also affect my hotgas temp more?
Is the air circulation outside my problem?
Is the Filterdryer temp differentiaö significant enough to affect the eev/superheat in this way?
Help, I am not a very experienced tech.
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