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HDK-MT350_EN_06
Operating the dryer for the first time (or after a change of desiccant) separately
Depending on the transportation and storage conditions, the desiccant in the
vessels can already be loaded with humidity from the environment. At each first
start-up it makes sense therefore to operate the dryer from some time separately
from the compressed air system. This causes the desiccant in each vessel to be
regenerated repeatedly and thus to be prepared optimally for the take-up of
humidity.
Note:
Depending on the pressure dew point to be achieved, we recommend
to operate the dryer at first start-up without compressed air
consumption:
for at least 4 hours at a pressure dew point of –25 to –40 °C
for approx. 3 to 5 days at a pressure dew point of –70 °C.
If you wish to take the dryer into operation in accordance with our
recommendation, proceed as follows:
► Ensure that the compressed air outlet valve installed by the owner is closed.
► Keep the compressed air outlet valve closed for the time period
recommended above.
Then the dryer can be taken into service in the compressed air system as
described in the following section:
Operate dryer immediately in the compressed air system
► Ensure that the compressed air system downstream of the dryer is
pressurised or that a start-up device (option, see page 16) was installed
downstream of the dryer.
This is even more important the larger the compressed air system
downstream of the dryer and the more often the compressor operates in cut-
out mode.
The ambient temperature must not drop be
Avoid a sudden drop in pressure in any circumstance! If pressure drops
too fast, this may cause damage to the dryer. Therefore, the compressed
air outlet valve must always be opened quite slowly!
► Slowly open the compressed air outlet valve installed by the owner. Observe
the vessel pressure gauge of the pressurised vessel. The pressure should
not drop below the operating pressure (if poss.). If necessary, keep the
compressed air outlet valve in a slightly open position until the compressed
air system downstream of the dryer has filled up completely; only then should
the valve be opened fully.
The dryer has then be taken into operation within the compressed air system.
In the event of a fault
In the event of an emergency or if a safety-relevant disruption occurs (e.g.
escaping compressed air, defective component), the dryer must be shut down
immediately as described in the section
Shutting down and restarting the dryer
page 35)
.
