Sterling 350-2100 CFM User Manual

350-2100 cfm Dryers 

Chapter 6: Maintenance 

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Dryer  

Desiccant Required per Tower 

Model 

Large Bead 

Small Bead 

Total 

350 30 

76 

106 

350-RT 30 76 106 
425 30 

90 

120 

425-RT 30 90 120 
500 40 

100 

140 

500-RT 40 100 

140 

600 40 

120 

160 

600-RT 40 120 

160 

700 40 

35 

175 

700-RT 40 35 175 
850 

120 120 240 

850-RT  120 120 240 
1000 

120 130 250 

1000-RT 120 130 250 
1250 

120 180 300 

250-RT  120 180 300 
1500 

120 240 360 

1500-RT 120 240 360 
1800 

120 310 430 

1800-RT 120 310 430 
2100 

120 360 480 

2100-RT 120 360 480 

ACS dryers have a number of single phase Calrod-type heater elements wired in a delta formation. 
They are mounted in the vertical compartment behind the right hand desiccant tower.  The number and 
wattage of the heaters varies with model, voltage, temperature range, etc., but the replacement 
procedure is the same. 

 

1.  Remove the bolts securing the process heater access cover. 

2.  Sketch the heater wiring configuration so the heaters may be re-wired properly. Heaters are 

mounted on a common plate of three or six for easy maintenance. 

3.  Remove the jumper bars and wires for the heater plate assembly(ies) being removed or replaced. 

4.  Remove the bolts securing the heater plate assembly and slide out the assembly. Avoid damaging 

the gasketing. 

5.  Remove individual heaters for replacement by removing the large brass nuts and washers. 

6.  Re-install the heaters and heater plate assemblies in reverse order, replacing gaskets if necessary.  

7.  Re-install the jumper wires and bars according to the sketch made earlier. 

8.  Re-secure the process heater access cover.