9
Refrigeration mode
Refrigeration mode is the normal operating mode of the A5xx Controller. The controller cycles the compressor on
and off and operates the evaporator fans according to the setup selections to maintain the setpoint temperature in
the refrigerated space. The controller displays the following behaviors in refrigeration mode:
• Evaporator fan icon: indicates whether the evaporator fan relay is on or off
• Cooling icon: indicates when the compressor is running
• Defrost icon: remains off
• Defrost relay: remains off
• UI: displays the HOME screen which shows the system name, date, time, space temperature, and setpoint.
The following figure and table provide information about the common application of an A5xx Controller in a
refrigeration environment.
Figure 5: Common application of an A5xx Controller
Table 4: Common application of an A5xx Controller callout table
Callout Item
1 Quick response expansion valve (QREV)
2 Evaporator fan with integrated defrost heater
3 Ambient temperature sensor
4 Defrost temperature sensor
5 PSHC
6 Cold room
7 A5xx Controller
8 Compressor and condensing unit
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