Sterling 350-2100 CFM User Manual

350-2100 cfm Dryers 

Chapter 3: Installation 

18 of 58 

 

;  Keep the delivery (to the drying hopper) hose as short as possible to minimize heat 

loss. Insulated hose is recommended and available for maximum energy savings.  

;  Do not use insulated hose on the return (from the drying hopper) 

;  Do not shorten the return hose. The return air to the blower must be 150

°F or below. 

;  Make sure the hoses are not kinked. 

;  Drying hopper air inlet and outlet locations vary, 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. 

The Aftercooler cools the moist air returning to the dryer from the drying hopper. The 
aftercooler can cool the return air from 250°F to about 150°F. This maintains the dryer's 
efficiency and condenses unwanted plasticizers from the airstream.  

1.  Support both sides of the fitting when making the cooling water connections to 

prevent damage to the aftercooler coil. 

2.  Connect 85°F water to the 1½" NPT inlet closest to the exiting air side of the 

aftercooler coil. This will cool the process air about 100°F and raise the water-out 
temperature about 10°F.  

 

Aftercooler 

 Model 

Recommended Cooling 

Water Flow Rate (GPM)  

AFT350 6.6 

gpm 

AFT425 10 

gpm 

AFT500 10 

gpm 

AFT600 13.2 

gpm 

AFT700 18 

gpm 

AFT850 18 

gpm 

AFT1000 22 

gpm 

AFT1250 22 

gpm 

AFT1500 25 

gpm 

AFT1800 25 

gpm 

AFT2100 25 

gpm 

 

ACS’s exclusive air trap assembly in the top of the drying hopper prevents ambient air from 
contaminating the material being dried. 

5.  Keep the material level above the bottom edge of the air trap for maximum 

efficiency.  

6.  Use a hopper loader or vacuum conveying system to maintain the proper material 

level.