How to deal with some problem of desicant air dryer (heatless type)

 

Problem	Probable cause	Remedy
Exessive backpressure in regeneration tower (Above 0,5 barg)	Silencer is clogged	Clean or replace silencer
	Presure gauge malfuntion	Check or replace pressure gauge
Depressurization fail	De-press valve & purge valve doesn’t open.	Check the de-press &purge and check its solenoid valve
	Silencer is clogged	Clean or replace silencer
	Low pressure	Check control air pressure (above 5 barg)
Re-press fail	De-press & purge valve doesn’t close	Check the  de-press & purge valve and check its solenoid valve
Excessive press. Drop	Excessive flow rate	Check working pressure
	Low inlet pressure	Check line pressure
Tower change failure	No control air low control press.	Check control air line & control filter.
	Controller failure	Check the PLC or PCB controller
Elevated dew point	Insufficient purge air	Check purge pressure (nor. 30-3.5 barg)
	Silencer is clogged	Check or replace silencer
	Low pressure	Check pressure source
	High inlet temp	Reduce inlet temp.Check after-cooler or ref.dryer
	Desiccant contaminated by oil	Install suitable pre-filter and replace desiccant
	Water entering	Check after-cooler or ref.dryer. If nescessary replace desiccant.