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• Units of temperature (Celsius or Fahrenheit)
• Display brightness and touchpad sound
• System name
In the system setup screens, you can also create an access password, select the preferred operating language,
download controller firmware updates, and set up the QREV/PSHC monitoring and control features.
Date and time setup
The date and time setup screens guide you through the set up of the following features:
Time format: select from 12 hours or 24 hours
Time: set the hours, minutes, and AM or PM time period
Date format: select to display the date as date, month, and year (DMY) or month, date, and year (MDY)
Date: set the date, month, and year
Auto daylight saving: enable the optional automatic changeover for daylight saving time
Sensor setup
The Sn1 cooling temperature sensor monitors and controls the temperature in the refrigerated space.
Temperature-termination defrost applications and the adaptive defrost feature require a Sn2 defrost termination
sensor or a HVBIN defrost termination switch mounted on the evaporator coil. The controller can use two types of
sensors. In North America, some standard A5xx Controller models ship with two A99B-type temperature sensors.
In Europe, the TS-6340 negative temperature sensor (NTC) is available for use. The Sn1 and Sn2 sensors are set
up independently; Sn1 and Sn2 do not have to be the same sensor type. To set up the sensors on an A5xx
Controller, select the sensor type and the sensor offset in the system setup screens. You can use the sensor offset
to offset the sensed temperature -5°C to 5°C or -5°F to 5°F. For example, if you apply a -3°F offset, the actual
sensed value of 30°F displays and controls as 27°F.
Evaporator fan setup
Select a single-speed evaporator fan or a two-speed evaporator fan. The hi-spd relay controls single-speed
evaporator fans. The lo-spd aux relay and the hi-spd relay control two-speed EC evaporator fans. When you
control single-speed fans with the hi-spd relay, the lo-spd aux relay is available to control an auxiliary device.
QREV/PSHC setup
The A5xx Controller can communicate with an optional PENN® QREV/PSHC. The QREV is a proportional control
expansion valve that uses microelectromechanical system (MEMS) microvalve technology to provide precise flow
control for industry standard HVAC and refrigeration applications. The PSHC controls the QREV performance. If
the refrigeration system uses a QREV/PSHC, you can monitor the QREV status, adjust the superheat setpoint, and
change the refrigerant type on the PSHC to match the refrigeration system’s refrigerant type. The QREV/PSHC
status screens display the following information:
• Superheat
• Evaporator outlet temperature
• Evaporator outlet pressure
• Current valve state
• PSHC firmware version
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