Start-Up Procedure - Domnick Hunter PNEUDRI MINI Manuel D'installation

5. START UP PROCEDURE
Ensure a suitable supply of compressed air between 4 and 10.5 bar g pressure is available and
check that the dryer cannot be overflowed.
NB All valves must be opened and closed gradually
Proceed as follows:
Using the By-Pass Line (F)
With the inlet (G) and outlet (H) valves closed the by-pass (J) valve open, introduce air to the dryer
by gradually turning the valve until fully open.
Allow the dryer to fully pressurise, then open the outlet valve whilst simultaneously closing the by-
pass valve.
The dryer is now on stream.
Without By-Pass Line (F)
Close inlet (G) and outlet (H) valves.
Introduce air to the dryer by gradually turning the inlet valve until fully open.
Allow the dryer to fully pressurise, then gradually open the outlet valve.
The dryer is now on stream.
During Operation
Following the start-up procedure, operation of the dryer is fully automatic and requires no further
attention until shut down.
The dryer column contains two chambers of desiccant material. Whilst one is drying the com-
pressed air (adsorption), the other is simultaneously undergoing regeneration (desorption).
Approximately every 2 minutes, the adsorption and desorption chambers are automatically reversed
in function. At the changeover, the air in the desorption column is vented to atmosphere, charac-
terised by a small hissing noise.
Shut-Down Procedure
Using By-Pass Line (F)
Close the outlet valve (H) whilst simultaneously opening by-pass (J) valve.
Close the inlet valve (G).
The air will now by-pass the dryer which will automatically depressurise.
Without By-Pass Line (F)
Close the outlet valve (H). Close the inlet vale (G). The dryer will automatically depressurise.
NB The by-pass valve (J) should only be opened if the dryer is undergoing maintenance.
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