Start Or Stop Defrost Cycle (Sdf); Binary Input Modes (Bin) - Penn A421 Series Installation Manual

Start or Stop Defrost Cycle (SdF)

The Start/Stop Defrost Cycle parameter allows you to start a defrost cycle, when the control
is in normal (On/Off cycle) operation, or stop a defrost cycle when the defrost cycle is On.
Change to the SdF value to 1 to start a defrost cycle. Or, change the value to 0 to stop the
defrost cycle, and return to normal (On/Off cycle) operation.

Binary Input modes (bIn)

The BIN mode allows you to select how the A421 Control operates when a user-supplied
binary switch connected across BIN and COM on the TB3 terminal block is used with the
control.
Set the BIN parameter to 0 to use the temperature setback feature. Set the value to 1 and
connect a user-supplied momentary contact switch to start or stop a defrost cycle.
Table 3: Standard parameter setup codes, descriptions, range of values, and default values
Parameter Parameter description (menu)
code
Un Temperature Units (Advanced only) ºF or ºC
OFF Relay Off Temperature (Basic,
Advanced, and Restricted)
On Relay On Temperature (Basic and
Advanced)
ASd Anti-Short Cycle Delay (Basic and
Advanced)
tSb Temperature Setback (Advanced
only)
So Sensor Offset Adjustment
(Advanced only)
HtS High Temperature Stop (Advanced
only)
LtS Low Temperature Stop (Advanced
only)
SF Sensor Failure Action (Basic and
Advanced)
bLL LCD Backlight Brightness Level
Adjustment (Advanced only)
dFt Defrost Cycle Time (Advanced only) 1 minutes to 99 minutes
dI Defrost Interval (Advanced only)
12 A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide
Range of usable values
-40ºF to 212ºF
(-40ºC to 100ºC)
-40ºF to 212ºF
(-40ºC to 100ºC)
0 minutes to 12 minutes
-50ºF to 50ºF
(-30ºC to 30ºC)
-5ºF to 5ºF
(-3ºC to 3ºC)
-40ºF to 212ºF
(-40ºC to 100ºC)
-40ºF to 212ºF
(-40ºC to 100ºC)
0 = output relay de-
energized
1 = output relay
energized
0 to 10; 0 = backlight off,
10 = brightest backlight
setting
0 or 2 hours to 24 hours
Factory default
value 1
ºF
25ºF
30ºF
1 minute
0ºF
0ºF
212ºF
-40ºF
1 output relay
energized
10 (brightest
backlight)
30 minutes
8 hours