Black Box Black Box Cold Row DX Remote Supply Temperature/Humidity Sensor, Discharge Pressure

Chapter 4: E2 Controller

You may lock any of the status display screens, bypassing the display screen time-out function. This is sometimes useful to maintain visibility to a specific screen when testing, making adjustments, or troubleshooting the system.

Simultaneously press the program key and Enter key for approximately 3 seconds to turn the screen lock feature On or Off. When a screen is locked, it remains displayed unless you press the Up or Down arrow keys to select a different screen within the menu loop. A symbol () appears in the upper right corner indicating the screen lock feature is On.

4.5.2.5 Remote Supply Temperature/Humidity Sensor

The remote temperature and humidity screens appear if your unit is configured for a remote supply T/H sensor. The screens display the supply air temperature and humidity as measured by the sensor that is to be customer installed in the cold aisle. Remote dewpoint is calculated by the controller based on the remote supply T/H sensor inputs and shown at the bottom of the display screen. Values measured by the sensor may be used to control the temperature and humidity.

4.5.2.6 Discharge Pressure

The Discharge Pressure Status screen only appears if your unit is a water- or water/glycol-cooled DX system. It displays the current operating head pressure. Discharge pressure is managed by the system controller based on the input of the head pressure transducer.

4.5.2.7 Setpoint Values

Displays the current operating temperature and humidity setpoints and control method. If configured for dewpoint control, the controller displays the calculated dewpoint setpoints for dehumidification and humidification as derived from the operating temperature and humidity setpoints.

4.5.2.8 Compressor Status

Displays the status icon (On or Off) for the system compressor and shows the status of the high pressure and low pressure switches (Open or Closed). It also shows the current status (On or Off) of the compressor and indicates “Min On” if the compressor minimum off time has elapsed. If the minimum off time has not elapsed, the display will show “Min Off,” and the actual minimum off time will appear next to it.

4.5.2.9 EEV Status

Displays the current operating position of the electronic expansion valve. The current suction pressure and temperature and the superheat temperature appear below. The bar gauge next to the valve icon provides a visual representation of the output signal controlling the valve position.

Figure 4-22. Information menu loop, part 2.

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