8.0 INSTALLATION AND START-UP
8.6 DESICCANT LEVEL VERIFICATION
Remove desiccant fi ll port at the top of each vessel (tower)
and check desiccant level. The level should be consistent
with the level depicted on the Desiccant Fill Chart on page
12 of this Technical Manual.
8.7 START-UP
• Slowly pressurize the dryer. When the dryer reaches full
operating pressure, check the system for air leaks. Soap
test all joints and fi tting. To maintain desired dew point,
any leaks detected must be fi xed, especially those on the
outlet side of the dryer.
• Make sure that the purge adjustment valve is open and
air outlet shut off valve (if equipped) is closed.
• For dryers equipped with a dew point monitor, remove
the dew point monitor sensor from the electrical enclo-
sure and install in the sensing block, located beside the
enclosure and attach the sensor cable to the sensor.
• On dryers equipped with the Moisture Load Control
(MLC) option, access the option through the DPC Con-
troller to verify that MLC is OFF to allow standard cycling
at start-up.
• Turn on dryer disconnect switch (supplied by customer)
to apply power to the dryer.
• For the fi rst 30 seconds that the dryer is energized, both
purge valves will remain closed. After 30 seconds, the
purge valve will be opened and depressurization will oc-
cur.
• With a voltmeter, check the power connections for the
correct voltage shown on the dryer serial nameplate.
• Close and secure all electrical panel covers.
• When the dryer is energized, the Power-On Light and
Right Tower Drying Light will illuminate. When the electri-
cal circuit is energized, the Solid State Timer will start au-
tomatically. See Section 6 for logic operating sequence.
For units equipped with NEMA 4 / DPC Package, after
initialization, the On button must be pressed.
• Following depressurization of the left tower, adjust purge
valve as described in Section 6.4.
• If the dryer has been in storage or off for an extended
period of time, the Blue Moisture Indicator (BMI) may
be gray, the High Humidity Alarm (if equipped) may be
activated and the dew point display (if equipped) may
indicate a high dew point. Depending upon the duration
of idle time, it may take anywhere from one to twelve
hours for the alarm condition to clear, the BMI to return
to its normal blue color state and the dew point to drop to
design levels.
• Slowly open the outlet valve to gradually pressurize the
down stream piping.
• On dryers equipped with Moisture Load Control, the
Moisture Load Control switch may be turned “ON” to
save purge air as described in Section 7.4.
!
NOTICE
For dryers equipped with the optional NEMA 4/DPC™
Package, refer to the NEMA 4/DPC™ Package Appendix
in this Technical manual prior to starting dryer.
!
NOTICE
At initial start-up, check the dryer operation for one or
two cycles, especially at the time of the tower shift. Ver-
ify that all systems are operating in their proper order
and sequence. If the dryer is not functioning properly,
contact distributor or ZEKS Technical Service.
!
NOTICE
When opening the outlet valve, insure drying tower
gauge maintains line pressure. Allowing pressure to drop
in the dryer will result in an overfl ow condition.
!
NOTICE
-80°F and -100°F dryers require fl ow through the dryer
to lower the pressure dew point to design levels. Failure
to permit air fl ow through dryer (deadheading) will re-
sult in elevated outlet dew points. Once air is permitted
to fl ow through the dryer, the pressure dew point will
gradually reduce to design levels.
ZEKS Eclipse ZPA 90-5000 Desiccant Dryers
www.zeks.com
9
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