Chapter 4: E2 Controller

Figure 4-18. Control inputs and outputs.

The E2 controller continually analyzes the demand for cooling, humidifying, and dehumidifying against the control setpoints and determines the appropriate response (control output signals) to operate the A/C system. The controller is equipped with analog input positions for monitoring temperature and humidity sensor(s). The controller monitors the actual cold aisle supply air conditions for three fan zones (upper, middle, and lower) as measured by temperature sensors mounted locally to each zone inside the Cold Row cabinet. The controller also monitors a temperature/humidity (T/H) sensor that is mounted in the return (hot aisle) side of the cabinet.

A remote, mounted supply air T/H sensor may also be provided as an option. The controller may be configured by the factory to manage system operation based on the remote T/H sensor inputs that are to be field installed in the supply (cold aisle) space.

4.4.1 Control Signals

Control output signals and alarm recognition takes place by means of the controller analyzing signal inputs from the sensor(s) and developing the appropriate digital or proportional response.

4.4.1.1 On/Off Digital Control

Based on control inputs, the controller provides an on/off output signal to activate certain modes of operation for the air conditioner (i.e. humidifier, fans, or annunciate an operating condition status, that is, alarm condition).

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Black Box Black Box Cold Row DX, CRDX-W-FS-12KW, CRDX-A-FS-24KW, CRDX-G-FS-24KW Control Signals, 1.1 On/Off Digital Control

CRDX-W-FS-12KW, Black Box Cold Row DX, CRDX-W-FS-24KW, CRDX-A-FS-24KW, CRDX-A-FS-12KW specifications

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