Sterling SDA Series 25-100 15 cfm Determining Temperature Controller Errors or Sensor Errors

Alarm Message	Cause	Corrective Action	Dryer Status
VALVE MTR	The limit switch on the	Limit switch may be out of	- Dryer Shuts down:
	valve may not have	position. Re-adjust the	- Process blower OFF.
	been wired correctly.	switch to make sure it trips	- Process heaters OFF.
	The valve has made	when it is at the high	- Regen heaters OFF.
	enough rotations and	position, and it does not	- Alarm light is ON
	the correct position of	touch the cam when it is at	- Alarm horn is ON.
	the valve was not	the low position.
	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.

6-2 Determining Temperature Controller Errors or Sensor Errors

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.

Other service problems or questions can be answered by contacting the Service Department.

15, 30, & 60 cfm Compact Dryers 39