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The temperature will reach -30°C in less than four hours; however, let the chamber cool for 8 hours minimum to allow for total heat removal from the cabinet. Again, this is a manual defrost system. If ice build up is present . inch or more on the fixed shelves, defrosting is recommended. Large ice build up will reduce cooling efficiency. If this system is equipped with a temperature display or alarm system it is not uncommon to observe a rise in temperature on the display following a door opening. Unless the door is left open for long periods of time this should not affect product temperature. The temperature display is independent of the thermostat that is actually controlling the off/on cycling of the compressor. Door opening will greatly affect air temperature but generally does not affect product temperature. ETC Single Stage Electronic Temperature (-30 Models Only) Operation Liquid Crystal Display (LCD) The LCD display provides a constant readout of the sensor temperature and indicates if the output rely is energized. When the S1 annunciator is constantly illuminated during operation, the relay is energized. The display is also used in conjunction with the keypad to allow the user to adjust the setpoint temperature, differential and heating/cooling modes. Control Setup The temperature setpoint refers to the temperature at which the normally open (NO) contacts of the output relay will open. Determine the load(s) to be controlled and the operating mode required, cooling or heating. .. When the cooling mode is chosen, the differential is above the setpoint. The relay will de-energize as the temperature falls to the setpoint. .. When the heating mode is chosen, the differential is below the setpoint. The relay will de-energize as the temperature rises to the setpoint. Programming Steps and Display The ETC can be programmed in four simple steps using the LCD display and the three keys on the face of the control. Step 1 - To start programming, press the SET key once to access the Fahrenheit/Celsius mode. The display will show the current status, either F for degrees Fahrenheit or C for degrees Celsius. Then press either the up . or down . arrow key to toggle between the F or C designation Step 2 - Press the SET key again to access the setpoint. The LCD will display the current setpoint and the S1 annunciator will be blinking on and off to indicate that the control is in the setpoint mode. Then press either the up . key to increase or the down . key to decrease the differential to the desired temperature. Step 3 - Press the SET key again to access the differential. The LCD will display the current differential and the DIF1 annunciator will be blinking on and off to indicate that the control is in the differential mode. Then press either the up . or the down . key to decrease the differential to the desired setting. Step 4 - Press the SET key again to access the cooling or heating mode. The LCD will display the current mode, either C1 for cooling or H1 for heating. Then either press the up . or down . key to toggle between the C1 or H1 designation. Press the SET key once more and programming is complete. Note: The ETC will automatically end programming if no keys are depressed for a period of thirty seconds. Any settings that have been input to the control will be accepted at that point. ...

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