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Hi
can I get some advice on a integral dryer in a compair air compressor,I am new to the refrigeration side of things, anyway dryer trips out and I have reset the pressure switch or hp switch dryers runs ok fan comp etc but would like to no what's causing it to trip as when I'm there is seems to run ok with , condenser clean and plant room has plenty ventilation, it runs on r407c
thanks
What is the HP switch set at? You say the fan is running, the coils clean, and there's plenty of ventilation, maybe the switch needs adjusting to stop the compressor over running.
Is the dryer sized correctly for the compressed air volume?
Is the compressed air inlet to the dryer to high. What type of pressure switch is it? If it`s round one with a reset button on the top that screws directly onto a schraeder fitting replace it with one connected via a capillary tube as the round ones are crap, and as they are fitted onto the pipework they can be affected by vibration.
Clean the condenser even if it looks clean. Check the capacitor on the fan motor.