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ICUBE™ FUNCTIONALITY
Modes
• Efficiency Mode – Scheduled defrosts are bypassed when the control is in this state. This is indicated when the blue
LED is ON continuously. If there is no thermistor probe attached or a probe failure occurs, the ICUBE™ module operates
solely off of the defrost timer and does not enter efficiency mode.
• Calibration Mode – The ICUBE™ module enters calibration mode
allowed defrost cycle. During calibration the control establishes a baseline coil behavior.
• Thermistor Probe Initialization – The number of thermistor probes connected to the control is detected during the
initial startup of the system. The blue LED flashes the number of times equal to the number of probes detected. If the
correct number of probes is not detected, disconnect power to the control before you attempt to correct the problem.
Optional: Manual Defrost
To initiate a manual defrost, rotate the FM timer dial clockwise through two consecutive scheduled defrosts within 60
seconds.
Optional: Multiple Evaporators
The ICUBE™ module has four sensor inputs that can monitor up to four evaporator coils. Typically, in a four-evaporator
system, the timer activates a contactor that energizes the multiple defrost loads simultaneously. When the ICUBE™ module
senses a decrease in capacity in one or more coils, efficiency mode shuts off and the defrost timer initiates a defrost at the
next scheduled interval as shown in FIG. 13.
For additional assistance, contact Technical Services at 1.815.675.7000.
ICUBE™ Adaptive Defrost Module
after the first Scheduled Defrost
Sensor Wires
FIG. 13
Evaporator System
6
©2016 Intermatic
and after each
ICUBE™ Module with
Grässlin™ Defrost Timer
Remote Condensing Unit
(Indoor or Outdoor)
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