Sterlco SDAP 90-225 CFM Series Drying and Conveying Systems - Manual (Page 25)

SDAP Series PD 2 to PD 4 Drying and Conveying Systems Page 25
3-11 Connecting Cooling Water to the Optional
Aftercooler
High temperature applications (300
°F to 400°F / 148°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
airstream. Aftercoolers are also required in extremely low temperature applications.
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).
3-12 Connecting Compressed Air
Note: Connect compressed air to the dryer before operation.
Caution!
Excessive air pressure damages the neoprene
components of the air distribution valve.
• Connect to a clean, dry, lightly lubricated source of 80 psi (551 kPa/5.51 bars) compressed
air.
• A pressure gauge and regulator are recommended components of your plant air supply.
• Connect the air supply using a ¼” NPT fitting.
The compressed air indicator switch prevents the dryer from starting without an 80 psi (551
kPa/5.51 bars) air supply. If the air supply drops to below 60 psi (413 kPa/ 4.13bars) during
operation, the dryer shuts down until at least 80 psi (551 kPa/5.51 bars) is restored.