Black Box CRDX-A-FS-24KW Operating Configurations, Compressor Operation, E2 Controller, Page

Chapter 4: E2 Controller

Figure 4-19. Dewpoint control.

4.4.3 Operating Configurations

The operating configuration for the controller depends on what type of air conditioner is being controlled (that is, AR, CW, W/G) and what features are selected. The operating configuration is preset by the factory according to the application. If certain features discussed in this manual are not factory enabled, no screens for that feature will appear in the controller user interface display.

4.4.3.1 Compressor Operation

The controller cycles the compressor on when it is determined that cooling is called for. The compressor is turned on based upon the controller’s cooling response to temperature and humidity inputs from the air sensors. The compressor is enabled following a time delay, once the programmed “Cooling Stage Enable” setpoint value is reached (see Figure 4-20).

Minimum			Start
Run Time		Stop 1
				1
Dehum		Cut-out	Cut-in
Min Temp	Set	1	1

Point

Figure 4-20. Compressor on/off cycle.

The compressor runs at a constant speed and an electronic hot gas bypass system manages capacity in accordance with the demand for cooling. The compressor is turned off when the control cut-out setpoint is achieved, provided the minimum run time is expired. Operating setpoints for the compressor are programmed by the factory, and no adjustment should be necessary. If adjustment is required, contact Black Box Technical Support at 724-746-5500 or info@blackbox.com.

The cooling cut-in and cut-out setpoints are set with a minimum span of 2.0° F.

NOTE: If the compressor cut-in/cut-out setpoints are set too closely together when adjusting setpoints, the compressor could run below the setpoint temperature during periods of light heat loads because of the minimum run time cycle.

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