System Start-Up - Intermatic DDT40 Installation And Operation Manual

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.
4. See TABLE 2 and FIG. 12 or FIG. 13 to verify proper
operation of the DDT40 control.
Mode LED Status
Green LED ON
A
Red LED OFF
Green LED OFF
Red LED OFF
B
Green LED ON
Red LED ON
ON
OFF
1 flash/1 second
A/B Blue LED
5 flashes/
10 seconds
1-4 flashes/
10 seconds
TABLE 2 LED Status Indicator Table
DDT40 Adaptive Defrost Control
Diagnostics
Control Mode
Refrigeration mode active
Defrost mode active
Refrigeration mode active
Defrost mode active
Next scheduled defrost to be
delayed (efficiency mode)
Next scheduled defrost active
Calibration mode
Thermistor sensor error
Only occurs at startup to
indicate the number of sensors
connected to the control
FIG. 11
Blue LED
Green LED
Red LED
FIG. 12 LEDs (Enclosed Model Shown)
Blue LED
Green LED
Red LED
9
Dead Front
Attach the Dead Front
FIG. 13 LEDs