A52x Series Electronic Refrigeration Controller with Adaptive Defrost Technical Bulletin
6
•
The fan icon indicates the evaporator fan relay status, which is either on or off.
•
The defrost relay and icon remain off.
•
The refrigeration icon indicates when the compressor is running.
•
The LCD user interface displays the Home screen, which shows the system name, date, time, space
temperature, and set point.
Figure 5: Common Application of an A52x Controller
Defrost Mode
The selections you make for defrost type, defrost termination type, and evaporator fan behavior determine how
your refrigeration system operates during defrost mode. See
Defrost Types
and
Defrost Termination Types
for
more information. To manually start or stop a defrost cycle, press the
Defrost
icon for several seconds.
Table 4: Common Application of an A52x Controller
Callout Item
Name
1
Compressor/Condensing Unit
2
QREV Expansion Valve
3
Evaporator Fan with integrated Defrost Heater
4
Ambient Temperature Sensor
5
Defrost Temperature Sensor
6
Precision Super Heat Controller (PSHC)
7
A52x Controller
8
Cold Room
