Using The Setback Feature - Conair W Series User Manual

Central
When supplied for cen-
tral drying applications,
the W Series Dryer does
not have setback capabil-
ities. Therefore the set-
back function is not
applicable.
4 - 4 2 l O p e r a t i o n
U s i n g t h e S e t b a c k Fe a t u r e
The DC-2 comes standard with setback installed, but disabled. You can choose to set the
mode to "Off", "Temperature", or "Manual On". Refer to the Control Function
Descriptions later in this section for more detailed information.
This feature is designed to save you money on energy costs and help to keep you from
over drying your material.
This is how setback operates when the control setback mode is set on Temperature.
The control monitors the temperature of the air exiting the drying hopper. If that tempera-
ture reaches a customer-entered setpoint (Screen 27), the delivery process air temperature
will automatically setback to a customer-entered setpoint (Screen 26). Then, if the air
exiting the drying hopper drops below the customer-entered temperature on Screen 27 by
an amount greater than what is shown on Screen 28, the process temperature will auto-
matically reset back to the original value (Screen 3).
To Activate Setback:
Screen 25 is used to set the setback mode. Screen 25 can also be used to change or moni-
tor the setback mode while in operation.
1
Reference the flow chart starting on Page 4-4 and follow the Menu Tree Path to
access Screen 25.
2
Set the Setback mode. "Off" turns the setback mode off, and the dryer will not
change the process setpoint. The "Temperature" setting tells the control the dryer
should go into setback when the hopper outlet temperature reaches the setpoint on
Screen 27.
3
Once you have selected your setback mode, go to Screen 26 and set the setback
process temperature. This screen shows the setpoint at which the process temperature
will go to once the control goes into setback. Note: Make sure your setback tempera-
ture is approximately 40° F above your return air temperature when using this feature.
When the control is in the setback mode, the LED on the dryer display beside SET-
BACK will illuminate. The actual temperature on the default screen will still show the
actual temperature measured at the hopper inlet. The setpoint shown on the default
screen will still show the original setpoint.