ZEKS Eclipse ZPA 90-5000 Desiccant Dryers
www.zeks.com
10
9.0 MAINTENANCE AND SYSTEM CHECK
9.1 SCHEDULED MAINTENANCE
DAILY MAINTENANCE FUNCTIONS:
• Check and record inlet pressure, temperature and fl ow.
Verify that it is within specifi cations.
• Check tower pressure gauge readings within operating
tolerance.
• Check operation for proper dryer cycling, depressuriza-
tion and repressurization.
• Check that the prefi lter drain is operating properly and
that there is no condensate discharged from purge muf-
fl ers.
• Verify that pressure in purging tower is 10 PSIG or less. If
higher, muffl er replacement is recommended. See SEC-
TION 10.
• Verify that prefi lter and afterfi lter differential pressure is
within operating limits. Replace elements and/or cartridg-
es as required. See SECTION 9.1 Semi-Annual Mainte-
nance.
• Check the Blue Moisture Indicator. Make sure air is
bleeding through the indicator. The indicator will be blue
when air is dry.
SEMI-ANNUAL MAINTENANCE FUNCTIONS:
• Check outlet dew point.
• Check pilot air fi lter element and clean or replace as
required.
• Replace prefi lter and afterfi lter elements and/or
cartridges.
ANNUAL MAINTENANCE FUNCTIONS:
• Check desiccant and replace if necessary.
• Inspect and clean pilot air control solenoid valves, check
valves and diaphragm valves. Rebuild and / or replace
as required.
• Test lights and switches, replace as necessary.
• Test electrical components, replace as necessary.
EVERY TWO YEARS:
• Replace diaphragm and seal kits on purge and switching
diaphragm valves.
EVERY THREE-TO-FIVE YEARS:
• Rebuild purge and switching diaphragm valves (Preven-
tative).
• Replace Check Valves (Preventative).
9.2 PREFILTERS AND AFTERFILTERS
PREFILTERS - The cartridges of the prefi lter must be
changed as often as required to prevent contamination of
the regenerative dryer’s desiccant bed.
The prefi lter and automatic drain must be checked daily.
To prolong fi lter cartridge life, it is recommended that a
mechanical air / moisture separator be placed immediately
before the prefi lter.
AFTERFILTERS - The purpose of the afterfi lter is to re-
move residual desiccant dust. Depending upon equipment
application and usage, frequency of fi lter element change
will vary. It is recommended that, at the minimum, the fi lter
element be changed every six months.
9.3 PILOT AIR CONTROL SOLENOID VALVES
The length of time the pilot air valves can reliably oper-
ate without replacement is dependent upon the type of
dryer and the dryer’s operation. On ZEKS -40°F dewpoint
dryers, replacing the valves every 60 months is recom-
mended. Given the difference in cycle times for -80°F and
-100°F units, these dryers should have their pilot valves
replaced every 30 months.
PILOT AIR FILTER ELEMENT IDENTIFICATION AND
REPLACEMENT
To determine the correct replacement element for the
Pilot Air Filter on the dryer, visually identify the fi lter that
is mounted on the right side of the Electrical Enclosure
and compare it to the options shown below. Select the
replacement element that matches the Pilot Air Filter and
use the corresponding Part Number when ordering.
!
NOTICE
Should the drying system be overloaded and/or
malfunctioning, causing high pressure drop, afterfi lters
may prematurely plug. This problem can be avoided
by frequent inspection and proactive replacement of
cartridges.
Use Replacement Element
Part No.: E15H
Use Replacement Element
Part No.: 104424
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