A421 Series Standard Electronic Temperature Controls Installation Instructions
9
A421 Control Parameter Setup Menus
The A421 temperature controls provide a Basic and an
Advanced setup menu that allow you to scroll through
the parameter setup codes, view and edit parameter
values, and set up your control for your application
requirement. The control also has a Restricted
(adjustment) menu. See Restricting User Adjustment
for more information.
Note: The A421 control retains a copy of the saved
parameter values in memory. When you change and
save a new value, the new value immediately
overwrites the previous value and is saved to memory.
In the event of a power failure, brown out, or when you
disconnect power from the control, all of the current
parameter values in memory are retained.
Reconnecting power to the control restores all of the
saved values.
Menu Navigation Guidelines
The A421 control buttons and display operate the
same in Basic and Advanced menu options. While in
any parameter code screen, the following behavior is
observed:
• The parameter code flashes on and off.
• Press or to navigate through all of the
parameter code screens.
• To exit either menu and return to the Main screen,
press and simultaneously.
While in any parameter value screen, the following
behavior is observed:
• The parameter value flashes on and off.
• Press or to scroll through all of the available
parameter values for the associated parameter
code.
• With the preferred parameter value displayed,
press MENU to save the value and go to the next
parameter code screen.
Note: If you do not press MENU to save a new value,
the control reverts to the last saved value.
After 30 seconds of inactivity, while in any screen, the
control reverts to the Main screen.
Basic Menu
The Basic menu allows you to quickly edit the On and
OFF temperature values, as well as the Sensor Failure
Mode (SF) and Anti-Short Cycle Delay (ASd) value.
See Parameter Codes and Modes of Operation
and
Table 4 for more information regarding parameter
codes, usable parameter values, and default values.
On Relay On Temperature (Basic and Advanced) -40 to 212 ºF (-40 to 100 ºC) 30 ºF
ASd Anti-Short Cycle Delay (Basic and Advanced) 0 to 12 (minutes) 0 (minute)
tSb Temperature Setback (Advanced only) -50 to 50 ºF (-30 to 30 ºC) 0 (ºF)
So Sensor Offset Adjustment (Advanced only) -5 to 5 ºF (-3 to 3 ºC) 0 (ºF)
HtS High Temperature Stop (Advanced only) -40 to 212 ºF (-40 to 100 ºC) 212 ºF
LtS Low Temperature Stop (Advanced only) -40 to 212 ºF (-40 to 100 ºC) -40 ºF
SF Sensor Failure Action (Basic and Advanced) 0 = output relay de-energized
1 = output relay energized
1 (output relay energized)
bLL LCD Backlight Brightness Level Adjustment
(Advanced only)
0 to 10; 0 = backlight off,
10 = brightest backlight setting
10 (brightest backlight)
Table 4: Standard Parameter Setup Codes, Descriptions, Range of Values, and Default Values
(Part 2 of 2)
Parameter
Code
Parameter Description (Menu) Range of Usable Values Factory Default
Values Shown
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