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Dehumidifying Dryers Chapter 3: Installation 21 of 59
Drying Hopper Air Trap Considerations
Our exclusive air trap assembly on the top of the drying hopper prevents ambient air from
contaminating the material being dried. To ensure that your unit will operate at peak
efficiency, do the following:
• Keep the material level at the mid point of the air trap
• This can be achieved by utilizing a hopper loader or vacuum conveying system to
supply material to the drying system.
Figure 1: Drying Hopper Air Trap
Optional Aftercooler
Water-cooled 15/30/60 cfm models use a water-to-air heat exchanger as an aftercooler.
Cooling water is required for this design (3 gpm at 85°F or lower). Return air from the
hopper passes through the air filter to trap fines and dust before entering the heat exchanger.
Installing Water Lines
(Hose and Hose Clamp)
When installing the water lines, ensure that the aftercooler utilizes either tower, chilled or city
water as warm as 85°F (29°C). Recommended flow rate is three (3 gpm) gallons per minute
(11 liters per minute).
Suggested material level
for the optimum
efficiency.
Air Trap
Flapper Valve
of the loader
Return air from the
drying hopper.
Delivery low dew point,
heated air to the drying
hopper.
Insulation
Recommended process
temperature control
thermocouple location.