9
DDT40 Adaptive Defrost Control
Setting Maximum Defrost Duration:
Different defrost durations may be set for each defrost initiation setting. Each white tab (tripper) provides a 15 minute interval.
For longer defrost duration, move additional tabs (following in time) from the initiation tab. For example, if a 45 minute defrost
is to start at 7:00 AM, move the tab outward that lies between 7:00 and 7:15 on the AM side of the dial, and the tabs
adjacent to 7:15-7:30 and 7:30-7:45. (3 tabs moved outward). The defrost will initiate at 7:00 AM and time terminate at 7:45
AM (if temperature termination does not occur first).
IMPORTANT INFORMATION: The Normally Closed contacts between terminals 2 and 4 are only closed when
the defrost timer is energized. The 2-4 contacts are the Normally Open contacts of relay K2. When checking
continuity of the control with no voltage applied, the 2-4 contacts will appear as open; this is normal. The 1-3
contacts will appear as open and the 1-F contacts will appear as closed. We recommend that the control be
tested by using a voltmeter, with rated voltage applied.
System Startup
1. Snap the provided dead front cover into place, if
applicable. See FIG. 11.
2. Re-apply power to the unit.
3. The control will sense the number of probes connected.
Note:
Observe the blue LED during startup in order to
verify that the ICUBE™ module registers the correct
number of thermistor probes. The blue LED will flash
once for each recognized probe.
Dead Front
FIG. 11
Attach the Dead Front
4. See TABLE 2 and FIG. 12 or FIG. 13 to verify proper
operation of the DDT40 control.
Diagnostics
Mode
LED
Status
Control Mode
A
Green LED ON
Refrigeration mode active
Red LED
OFF
Defrost mode active
B
Green LED OFF
Refrigeration mode active
Red LED
OFF
Green LED ON
Defrost mode active
Red LED
ON
A/B
Blue LED
ON
Next scheduled defrost to be
delayed
(efficiency mode)
OFF
Next scheduled defrost active
1 flash/1 second
Calibration mode
5 flashes/
10 seconds
Thermistor sensor error
1-4 flashes/
10 seconds
Only occurs at startup to
indicate the number of sensors
connected to the control
TABLE 2
LED Status Indicator Table
Blue LED
Green LED
Red LED
FIG. 12
LEDs (Enclosed Model Shown)
Blue LED
Green LED
Red LED
FIG. 13
LEDs
