Section 4
17
DHL HEATLESS REGENERATIVE DRYER
STARTUP
4.1 PRELIMINARY OPERATION
Verify that the operating parameters
match with the nominal values reported
on the data plate of the dryer (voltage,
frequency, air pressure, air temperature,
ambient temperature, etc.).
Before delivery, each dryer is submitted to accurate
tests simulating real operating conditions.
Nevertheless, the unit could be damaged during
transportation. We therefore suggest to check the
integrity of the dryer upon arrival and to keep it under
observation during the first hours of operation.
The start-up must be performed by
qualified personnel.
It’s mandatory that the engineer in
charge will adopt safe operational
conditions complying with the local safety and
accident prevention requirements.
The same engineer will be responsible
for the proper and safe operation of the
dryer.
Never operate the dryer if its panels are
not in place.
4.2 FIRST START-UP
At the first start-up, or in case of start-up
after a long inactivity period or following
to maintenance operations, comply with
the instructions given below. The start-up
must be performed by qualified
personnel.
Maintenance personnel must wear
hearing protection while operating the
dryer Each employee must select proper
PPD (Personal Protection Device)
hearing protector (earmuffs, ear canal
caps and earplugs) in order to prevent any
discomfort or damage to the operator’s hearing.
S
EQUENCE OF OPERATIONS:
• Verify that the factory settings, indicated in
the plate “REMOVE BEFORE THE 1ST
START UP” (on the control panel), match
the real operating conditions requested.
• Verify that all the steps of the “Installation”
chapter have been observed.
• Verify that the connection to the com-
pressed air system is correct and that the
piping is suitably fixed.
• Verify that the condensate drain pipe is
properly fastened and connected to a col-
lection system or container.
• Remove any packaging and other material
which could obstruct the area around the
dryer.
• Pressurize the dryer slowly.
• Close the breaker for the electrical supply.
• Verify that the control panel is on.
• Check the piping for air leakage.
• Test the drain of the inlet filter.
• After 2 minutes from the start-up the
adsorption tower B is depressurized.
• Wait for the dryer to make a few cycles
(there is an alternation of depressurization
from tower A to tower B)
• The cycle is inverted every 2 minutes
(DewPoint of -94ºF/-70°C) or every 4 min-
utes (DewPoint of -40ºF/-40°C) or every 7
minutes (DewPoint of -4ºF/-20°C); it
depends on the dryer set-up.
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