I have a straight forward split DX system running on R407C, that serves a critical IT comms room. The other unit in this room is currently awaiting a new compressor and so this unit must remain on at all times.
System trips on HP despite condensor coil being unblocked and cond fan running at full speed.
Suction Pressure is 65 Psi, ambient approx 21 C.
Discharge in excess of 4OO Psi.
I have bypassed HP switch and removed approx 1Kg charge and now the system is running at 45/345 Psi....ie both the suction and discharge have reduced, though discharge is still too high.
Off coil duty is approx 6-8C with room temp of 22C.
I originally thought the system could be overcharged, and still might be though i am unable to reclaim all refrigerant until the other unit is repaired.
Any ideas as to why HP ???