Van Air Systems PLD 8-7.2 / 36-7.2 - Manual (Page 5)

PAGE 5
Close dehydrator drain valve. See Figure 2-A Recommended
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 consumption rate is dependent upon
several factors, such as inlet temperature and fl ow. In Section 4.5,
DESICCANT CONSUMPTION, are several charts showing desic-
cant consumption rates. Use the charts to determine an approximate
usage rate for your application.
WARNING
IF DRYER IS NOT DRAINED REGULARLY,
FLOODING WILL OCCUR AND ACCUMULATED
LIQUID MAY ENTER SYSTEM AND DAMAGE
DOWNSTREAM EQUIPMENT.
NOTE
Use VAN GAS desiccants only. Filling dryer with
any other material will void the warranty.
WARNING
WHEN HATCH 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.
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 fi tting
connections made during installation for leaks. If any leaks are
present, immediately depressurize the system and remedy the
problem before continuing operation.
4.0 MAINTENANCE
3.0 OPERATION
3.1 START-UP
4.1 MAINTENANCE
CAUTION
Make sure that the dehydrator is not subjected
to sudden fl ow surges. Always open valves
slowly to permit a gradual equalization of
pressure between the dehydrator and the gas
supply lines.
4.2 INSPECT DESSICCANT BED LEVEL
WARNING
COMPLETELY DEPRESSURIZE DRYER
BEFORE ATTEMPTING TO REMOVE FILL
COVER.
Remove the fi ll cover.
Using the chart in Figure 4-A, determine the proper quantity of
prebed.
Place the prebed into the dehydrator fi rst. Level off the prebed.
Again using the chart in Figure 4-A determine the correct quantity
and type of desiccant required to fi ll the dehydrator.
Slowly pour the desiccant into the dehydrator. Level off the desic-
cant bed. The desiccant level should NOT be higher than the
OUTLET screen.
Replace the fi ll 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.