Van Air Systems HL-200 - HL2000 - Manual (Page 19)

PAGE 19
SHUTDOWN SECTION 10
10.1 SHUTDOWN PROCEDURES
Close the inlet and outlet isolation valves (if installed). Open the bypass
valve (if installed). Let the dryer depressurize completely.
Turn the dryer off by either pressing the Stop button if the dryer has a
Standard Control Box or place the Power switch to the OFF
MAINTENANCE & TROUBLESHOOTING SECTION 11
11.1 DAILY INSPECTION
The following procedures should be performed daily:
• Check the dryer operating conditions, inlet temperature, ambient
temperature, inlet pressure and inlet flow.
• Monitor the dryer for one complete cycle. Make sure it is
operating properly.
• Check the purge mufflers. Purge air should be exhausting from
one of the valves. If oil is present, the dryer and air system may be
contaminated with lubricants.
• Inspect all upstream equipment, aftercoolers, separators, drains
and filters.
• Check the pressure differential indicator on all prefilters and
afterfilters. If the differential pressure is unacceptable, replace the
elements.
• Check the prefilter(s) for proper draining. If the prefilter is not
equipped with an automatic drain, it must be drained manually.
• Make sure that all bypass valves are tightly closed.
• Visually check the dryer and piping for damage.
Visually check the dryer moisture indicator (blue dry or pink wet)
11.2 SCHEDULED MAINTENANCE
12 MONTHS
• Replace purge muffler elements
• Replace the control air filter element
24-60 MONTHS
• The desiccant in the towers should be replaced every two to five
years. The life of the desiccant will vary depending on the inlet air
conditions. Systems with excessive contaminants and/or inad-
equate filtration will decrease the life span of the desiccant
drastically. Once the desiccant is contaminated with lubricants, it
must be replaced.
Remove any oil, dirt, or scale from the towers and inlet piping. Do
NOT weld, grind or sandblast the vessels as this voids the ASME
Certification. The vessels may be steam cleaned internally and
externally to remove dirt and oil.
CAUTION
Make sure that the towers are clean to prevent contamination of
new desiccant.
Replace plugs securely on desiccant drain ports. Apply pipe thread
sealant as necessary.
Make sure that the drain ports or hatch covers are installed before
attempting to fill the towers. Load desiccant through the desiccant
filler ports or hatches. REFER TO SECTION 3.1 FOR PROPER
DESICCANT AMOUNTS.
Reinstall the fill port plugs. Apply pipe thread sealant as necessary.
Follow START UP PROCEDURES IN SECTION 5.1 to start up and place
dryer in operation.
11.3 DESICCANT REPLACEMENT
WARNING
DO NOT ATTEMPT TO REMOVE PLUGS OR HATCH COVERS
UNTIL ALL AIR PRESSURE IS OUT OF THE VESSEL. CHECK
ALL TOWER PRESSURE GAUGES, MAKING SURE THAT THEY
ARE AT 0 PSIG AND INCOMING PRESSURE HAS BEEN TURNED
OFF.
ALWAYS WEAR EYE PROTECTION AND GLOVES WHEN
HANDLING THE DESICCANT. DESICCANT DUST MAY CAUSE
EYE AND SKIN IRRITATION. AVOID BREATHING THE DUST
AND PROLONGED CONTACT WITH THE SKIN.
FIRST AID IN CASE OF EYE CONTACT, IMMEDIATELY FLUSH
EYES WITH PLENTY OF WATER FOR AT LEAST 15 MINUTES.
CONSULT A PHYSICIAN.
Take dryer off stream following the SHUTDOWN PROCEDURES IN
SECTION 10.
Remove the plugs from the desiccant drain and fill ports; drain old
desiccant from each tower.
11.4 CONTROL AIR FILTER REPLACEMENT
Close the dryer inlet and outlet isolation valves (and open bypass
valve if provided). Turn off the power and completely depressurize
the dryer.
WARNING
DO NOT REMOVE THE FILTER BOWL FROM HEAD UNTIL
HOUSING IS COMPLETELY DEPRESSURIZED.
After all pressure is out of the dryer, grasp the filter bowl firmly, while
pushing the bowl upward turn it clockwise to remove it from the filter
head.
Remove the used element from the head. Discard used element
properly.
Remove new element from the shipping package. Place the new
element into the filter head.
While pushing the bowl upward into the head turn the bowl
counterclockwise to lock it in place.
Following the start up procedures in SECTION 5.1 for the dryer,
place the dryer on stream.
position for the Cycle Saver or Emcon II Control Boxes.
If maintenance is to be preformed on the dryer, make sure the dryer is
completely depressurized. Tower pressure gauges must read 0
PSIG before removing any item on the dryer.
•