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11.1 SCHEDULED MAINTENANCE
Daily Maintenance Functions:
• Check and record inlet pressure, temperature and flow. Verify that it is
within specifications.
• Check tower pressure gauge readings within operating tolerance.
• Check tower pressure gauges for proper dryer cycling.
• Check that pre-filter condensate drains are functioning properly.
Replace cartridges sooner if necessary as required by differential
pressure indicator.
• Verify that pressure in purging tower is 5 PSIG or less.
• Verify that pre-filter and post-filter differential pressure is within
operating limits. Replace cartridges sooner if necessary as required by
differential pressure indicator.
Monthly Maintenance Functions:
• Check your operating conditions: inlet flow, inlet pressure, and inlet
temperature.
• Check pre-filter(s) and post-filter(s) differential pressure and drains.
Replace cartridges sooner if necessary as required by differential
pressure indicator.
• Check dryer cycle and sequence of operations (i.e. drying,
depressurizing, regenerating).
Quarterly Maintenance Functions:
• Replace pre-filter(s) and post-filter(s) cartridges. Replace cartridges
sooner if necessary as required by differential pressure indicator.
• Check pilot air filter element and replace as needed.
Semi-Annual Maintenance Functions:
• Check outlet dew point.
• Check amp draw on heater.
• Replace pre-filter and post-filter elements and / or cartridges. Replace
cartridges sooner if necessary as required by differential pressure
indicator.
Annual Maintenance Functions:
• Check desiccant and replace if necessary.
• Inspect and clean no-loss drain valves and check valves. Replace
worn or damaged seats and parts as required.
• Test lights and switches, replace as necessary.
• Test electrical components, replace as necessary.
• Check and repair any air leaks, loose bolts, flanges and fittings.
Every Two Years:
• Change check valves
• Change control no-loss drain valves
• Check and change temperature probes
Every Three to Five Years:
• Replace desiccant.
NOTICE
Refer to Section 10.7 for the proper way to shut down the Heat
Reactivated Dryer.
11.2 PRE-FILTERS AND POST-FILTERS
Pre-filter elements must be changed as often as required to prevent
contamination of the regenerative dryer's desiccant bed.
Pre-filter drains must be checked daily. Failure to drain condensed liquid
from the sump of the filter housing will result in carry over and damage
to the desiccant material. HB post-filters are used to prevent desiccant
dust particulate contamination from migrating downstream into plant
processes. Elements should be changed as pressure drop increases to
an undesirable level.
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11.0 MAINTENANCE AND SYSTEM CHECK
EH Series Desiccant Dryer Models 150-8000
http://www.ingersollrandproducts.com
NOTICE
Should the drying system be overloaded and/or malfunctioning causing
high pressure drop, HB post-filters will prematurely plug. This problem
can be avoided by frequent inspection and cleaning of elements.
WARNING
Depressurize the system before disassembling filters. Failure to do so
may result in injury or death.
Filter elements should be changed as indicated on the pressure
differential gauge. Change carbon elements when hydrocarbons are first
detected downstream or every six months, whichever comes first.
Certain filters contain multiple elements. When replacing filter elements,
all elements should be replaced simultaneously. Mixing new and old
elements can result in reduced air quality.
11.2.1
THREADED FILTERS:
STEP 1 - Rotate filter bowl counter-clockwise to loosen bowl from filter
head. If necessary, a spanner and/or strap wrench may be used.
Remove bowl.
STEP 2 - Elements are removed by grasping element and pulling
downward. Note that filter bowl need only be dropped approximately 2"
to permit element to drop from head.
STEP 3 - Inspect element prior to installation. If necessary, lubricate o-
rings on upper end cap to facilitate installation.
Inspect filter head o-ring. Lubricate, reseat or replace as required. If
equipped with internal float drain, inspect drain operation. Repair or
replace as required.
STEP 4 - Insert element into filter head and push into place.
Reinstall filter bowl. Alternately, the element may be placed within the
center of the filter bowl with the o-rings facing upward. The element will
seat itself in the filter head as the bowl is threaded into place.
STEP 5 - With replacement element installed, tighten filter bowl such
that the flat of the filter bowl is in contact with the filter head.
STEP 6 - With filter bowl tightened, slowly pressurize filter. Avoid rapid
introduction of compressed air to the filter.
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