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3-4 Process Air Connections Between the Dryer and Drying Hopper
Remove the cap plugs from the inlet, discharge and bleed tubes before operation.
Use high-temperature flexible dryer hose to connect the dryer to the drying hopper.
Keep the delivery hose as short as possible to minimize heat loss. Insulated dryer hose is
available for maximum energy savings.
Do not shorten the return hose.
Make sure the hoses are not kinked.
Drying hopper air inlet and outlet locations vary from one drying hopper model to
another, but always connect the hoses so the dry process air from the dryer enters the
bottom of the drying hopper and flows out the top to return to the dryer inlet.
3-5 Connecting Cooling Water to the Optional Aftercooler/Precooler
and Closed Loop Regeneration
High temperature applications (250°F to 400°F / 121°C to 204°C) require aftercoolers to cool
moist air returning to the dryer from the drying hopper. An aftercooler cools the return air by
100°F (38°C); this maintains dryer efficiency and condenses unwanted plasticizers from the air-
stream. Heat Exchangers are also required (called pre-coolers) when processing materials that
have extremely low drying temperatures (typically 120 F to 150 F / 49 C to 66 C). Check your
specific dryer model technical specifications for actual requirements. Some models have a
minimum low end temperature range that will determine actual requirements.
Installing Water Lines
• Use the ½” (about 13 mm) brass pipe nipples for water line connections.
Inlet and outlet line positions do not matter.
• Make sure you grip the nipple tightly when attaching a fitting. Doing so
prevents damage to the soft copper coils. You should make connections
with flexible hose to allow removing the coil assembly for cleaning.
• The aftercooler is designed to utilize either tower or city water as warm as
85ºF (29ºC). Recommended flow rate is one to three (1 to 3) gallons per
minute (4 to 11 liters per minute).
OPTIONAL PLASTICIZER TRAP –
• Plasticizer traps should be used when resins are processed in the family of acetates, butyrates and/or
propionates. They should also be used when any resin (when dried) is known to produce residue,
contaminates or volatiles. This contaminate is trapped in the air stream and is carried back from the
drying process as the air leaves the drying hopper.
• The plasticizer trap will condense the contaminate that is in the air stream and remove it before it
enters the dryer unit. If this contaminant is not removed, it can foul the desiccant beds and damage
mechanical components in the dryer and in the drying process
• Review your process and confirm with your resin supplier if this will be an issue. If it is, a Plasticizer
trap must be used or it will void the warranty on the dryer.
Installation 24
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