Sterling 60 cfm User Manual

15, 30, & 60 cfm Compact Dryers 

 

39 

 

 
 
 
 
 

Limit switch may be out of 
position. Re-adjust the 
switch to make sure it trips 
when it is at the high 
position, and it does not 
touch the cam when it is at 
the low position. 

 

The limit switch on the 
valve may not have 
been wired correctly. 
The valve has made 
enough rotations and 
the correct position of 
the valve was not 
detected. 

The switch is indicating the 
incorrect desiccant tank is in 
regeneration. Check the 
wiring of the switch against 
the wiring diagram. Make 
sure all the wire connections 
are tight. 
Limit switch may be faulty. 
Replace the switch and 
make sure the wires are 
connected correctly. 

- Dryer Shuts down: 
- Process blower OFF. 
- Process heaters OFF. 
- Regen heaters OFF. 
- Alarm light is ON 
- Alarm horn is ON. 

 

 

 

Using a Thermocouple 
If the controller displays a temperature that is close to room temperature (70ºF/21ºC) when 
you short-circuit controller input terminals, the controller is normal and the sensor is probably 
broken, short-circuited, or incorrectly wired.