Black Box CRDX-A-FS-12KW Manuale Utente
724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 57
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.
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).
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).
Set
Point
Cut-in
1
Cut-out
1
Start
1
Stop 1
Minimum
Run Time
Dehum
Min Temp
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.
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.