Van Air Systems PLD 8-14.5 / 36-14.5 - Manual (Page 5)

PAGE 5
Close dehydrator drain valve. See Figure 2-A Recom-
mended Installation.
SLOWLY pressurize by opening the inlet shutoff valve (if
installed).
Open the outlet shutoff valve (if installed) slowly to place
dehydrator on stream.
3.2 SHUTDOWN
Before shutdown, use the manual drain valve to remove
any liquid that has accumulated in the sump area of the
vessel.
Close dryer inlet and outlet shutoff valves (if installed).
Open drain valve to depressurize the vessel.
Check bed level monthly until the actual usage rate is
determined.
During the drying process, the desiccant tablets dissolve
slowly. More tablets must be added to the supply when the
top of the bed drops to the MINIMUM LEVEL. The consump-
tion rate is dependent upon several factors, such as inlet
temperature and flow. In Section 4.5, DESICCANT CON-
SUMPTION, are several charts showing desiccant con-
sumption rates. Use the charts to determine an approximate
consumption rate for your application.
WARNING
IF VESSEL IS NOT DRAINED REGULARLY,
FLOODING WILL OCCUR AND ACCUMU-
LATED LIQUID MAY ENTER SYSTEM AND
DAMAGE DOWNSTREAM EQUIPMENT.
NOTE
Use VAN GAS desiccant only. Filling dryer with
any other material will void the warranty.
WARNING
COMPLETELY DEPRESSURIZE DRYER
BEFORE ATTEMPTING TO REMOVE FILL
COVER.
Close dryer inlet and outlet shut-off valves (if installed).
Open drain valve and allow dryer to depressurize
completely.
4.3 ADDITION OF DESICCANT
Use a solution of soapy water to check all pipe and
fitting connections made during installation for leaks. If
any leaks are present, immediately depressurize the
system and remedy the problem before continuing
operation.
3.0 OPERATION
3.1 START-UP
4.1 DRAIN VESSEL REGULARLY
CAUTION
Make sure that the dehydrator is not sub-
jected to sudden flow surges. Always open
valves slowly to permit a gradual equaliza-
tion of pressure between the dehydrator and
the gas supply lines.
4.0 MAINTENANCE
4.2 INSPECT DESICCANT BED LEVEL
Using the chart in Figure 4-A Determine the proper
quantity of prebed.
Place the prebed into the dehydrator first. Level off the
prebed.
Again using the chart in Figure 4-A determine the
correct quantity and type of desiccant required to fill the
dehydrator.
Slowly pour the desiccant into the dehydrator. Level off
the desiccant bed. The desiccant level should NOT be
higher than the OUTLET screen.
Replace the fill cover.
WARNING
WHEN FILL COVER IS REMOVED TO ADD
DESICCANT, ALWAYS CHECK O-RING FOR
SIGNS OF WEAR.
CHECK COVER FOR RUST, CORROSION OR
DAMAGE; REPLACE AS NEEDED.
SEE SECTION 6 FOR REPLACEMENT
PARTS.
Remove the fill cover.
Close the drain valve.
Slowly open the inlet shut-off valve (if installed) to
pressurize the dehydrator.
Open the outlet shut-off valve (if installed) and place the
dehydrator on stream.