ZEKS Eclipse ZPA 90-5000 Desiccant Dryers
www.zeks.com
11
9.0 MAINTENANCE AND SYSTEM CHECK
9.4 MUFFLER CHANGEOUT PROCEDURE
• Depressurize the dryer turn control power off.
• Replace muffl er.
• Follow Start-up procedure described in SECTION 8.7.
• Turn control power back on.
9.5 PURGE AND SWITCHING DIAPHRAGM VALVES
These valves have two control ports; one on top and the
other on the back side.
• Normally Open (N.O.) Valves: For N.O. inlet or repres-
surization valves, control air is supplied to the top port.
The back side port exhausts out the bottom side of the
diaphragm. If air leaks continuously when control air is
supplied to the valve, the internal seals are leaking and
must be replaced.
• Normally Closed (N.C.) Valves: For N.C. purge valves,
the top port is plugged. Control air is supplied to the back
port. If air vents out of the back port continuously when
the solenoid is de-energized, it will exhaust through the
top of the solenoid. If this condition is observed, the inter-
nal seals are leaking and must be replaced.
9.6 OUTLET CHECK VALVES
Outlet check valves sealing can be verifi ed by depressur-
izing the dryer and slowly applying pressure to the outlet.
The valves should seal and prevent air from pressurizing
the towers. If a tower begins to pressurize, the check valve
on that side requires replacement.
9.7 DESICCANT CHANGEOUT PROCEDURE
When it becomes necessary to replace the desiccant in
the towers, or on units that are shipped without the desic-
cant installed, observe the following procedure:
• The standard units are furnished with fi ll and drain ports
on each desiccant tower. Remove the caps on both ports.
• To assist in getting the desiccant to fl ow from the tower,
insert a small rod into the drain port as necessary. This
may be required as the desiccant is packed into the tow-
ers which may interfere with the desiccant fl ow from the
towers.
• Retainer screens, located at the inlet and outlet piping
connections of the tower, are removable on all models. It
is suggested that these screens be removed and cleaned
at the time of desiccant changeout. These screens can
be accessed by disconnecting the upper and lower mani-
folds from the dryer towers.
• After cleaning the retainer screens, replace screens and
reattach the outlet port plug.
• With the fi ll port plug removed, fi ll the dryer tower with the
appropriate grade and size desiccant. For those dryers
that are shipped without desiccant installed, using the fi ll
kit provided with the dryer will facilitate fi lling the desic-
cant in the tower. The level of the desiccant should be
below the top retainer screen as shown on the Desiccant
Fill Chart on the following page.
• Once the towers have been fi lled, replace the fi ll port plug
on each tower.
• Any connections disturbed in the desiccant changeout
process should be leak tested prior to re-commissioning
the dryer.
!
WARNING
To avoid injury, depressurize dryer before performing
any service.
!
CAUTION
Desiccant will produce dust during the changeout pro-
cedure. Be sure to wear respiratory protection during
the draining and fi lling process to minimize inhalation of
desiccant dust.
!
WARNING
To avoid injury, depressurize dryer before performing
any service.
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