Navigating The Basic And Advanced Menus; A421 Control Parameter Setup Menus - Penn A421 Series Installation Manual

Table 3: Standard parameter setup codes, descriptions, range of values, and default values
Parameter Parameter description (menu)
code
SdF Start or Stop Defrost Off-Cycle
(Advanced only)
bIn Binary Input Mode (Advanced only) 0 = Temperature Setback
1 The default values for general application A421 models are shown. OEM A421 models may have different default values.

A421 Control parameter setup menus

The A421 Temperature Controls have a Basic and an Advanced setup menu. You can use these
menus 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
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
saves 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.

Navigating the Basic and Advanced menus

The A421 Control buttons and display operate the same way in the Basic and Advanced menus. You
can perform the following actions in any parameter code screen:
The parameter code flashes on and off.
• To navigate through all of the parameter code screens, press Down or Up.
• To exit either menu and return to the Main screen, press Down and Up simultaneously.
You can perform the following actions in any parameter code screen:
The parameter value flashes on and off.
• To scroll through all of the available parameter values for the associated parameter code, press
Down or Up.
• 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.
for more information.
A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide
Range of usable values
Change 0 to 1 to Start a
new Defrost Cycle
Change 1 to 0 to Stop a
Defrost Cycle
Mode
1 = Start Defrost Cycle
Mode
Factory default
value 1
0
1
13