A52x Series Electronic Refrigeration Controller with Adaptive Defrost Technical Bulletin
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Figure 8: Example of the A52x Controller Relay States During Defrost Duration, Drip Time Delay, and
Evaporator Fan Delay
System Setup Parameters
The System Setup parameters define the basic system attributes, the hardware features, and hard-wired
components of your refrigeration system.
The first step in setting up an A52x Controller for your refrigeration system requires entering the System Setup
parameters. After the System Setup parameters are defined to your system’s requirements, only the setup screens
and parameters that are required to set up the system’s operation are available for set up.
System Setup parameters include the following features:
•
Time and date
•
Defrost type
•
Defrost termination type
•
Evaporator fan type
•
Sensor type
•
Units of temperature (Celsius or Fahrenheit)
•
Display brightness and touchpad sound
•
System name
In the System Setup screens, you can create an access password, download controller firmware updates, and also
set up the Quick Response Expansion Valve/Precision Superheat Controller (QREV/PSHC) monitoring and control
features.
Time and Date Setup
The Date/Time setup screens guide you through the setup of the following features:
•
Time Format (12 or 24 hours)
•
Time (hours, minutes, and AM or PM)
•
Date Format (DMY or MDY)
On
Off
Off
On
Off
Compressor
Relay
Defrost
Relay
LO/AUX
(Fan) Relay
On
Off
On
Off
Off
Defrost
Duration
Drip Time
Delay
Evap Fan Delay
(Cool Down)
Normal Cooling
Mode
Off
Off
Defrost
Termination
Drip Time
Ends
Evap Fan Delay
Ends
TIME
Off
Load
Demand
Satisfied
