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6.2.5.1 Configuration
Use the configuration tab to specify the general operation of the controller and the controller’s use of parameters that are programmed on other tabs.
Controller Operation temperature Units
Select Fahrenheit or Celsius as the unit of temperature measurement and control. Changing this parameter changes the temperature unit throughout the
controller program and recalculates temperature values shown in the tabs and on the display.
Defrost Method
Select the method of defrosting to be used. Defrosting is started according to the parameters on the Defrost tab.
• Electric can be used by the E72R controller to control the defrost relay during a defrost cycle. The E71R does not have a defrost relay, but powers off
the compressor during an electric defrost.
• Off Cycle can be used by the E71R and E72R controllers to cause the compressor to remain powered off for the duration of the defrost cycle.
• Reverse Cycle can be used by the E72R controller to actuate a solenoid valve that reverses the cooling cycle to act as a heat pump to defrost
accumulated ice. The compressor remains powered on during defrost.
Evaporator Temperature Sensor
Select Enabled if the controller is using an evaporator temperature sensor (see 5.1.4 Defrost Control). Select Disabled if the controller is not using an
evaporator temperature sensor.
NOTE: If Enabled is selected and an evaporator temperature sensor is not connected to the controller, the controller indicates a sensor failure.
Defrost Termination Method
• Select Disable to force defrost to terminate only due to elapsed time (Defrost Duration on the Defrost tab).
• Select Evaporator Sensor to use the sensed evaporator temperature to end defrosting (Defrost Termination on the Defrost tab).
• Select Control Sensor to use the control temperature to end defrosting (Defrost Termination on the Defrost tab).
• Select Switch (NO) to use a separate normally open defrost termination switch. Defrost is terminated when the switch is closed. If Switch is selected,
the controller will still end a defrost cycle based on the elapsed time even if the switch is not closed.
If either sensor is selected, enter the Defrost Termination Temperature for the sensor on the Defrost tab. The selection of Defrost Termination Method
does not affect how defrosting starts or the Temperature Initiated Defrost Function on the Defrost tab.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
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