FCAx3 USER MANUAL
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2. FUNCTION
2.1 TEMPERATURE CONTROL
The FCAx3 is a microprocessor-based temperature controller utilising up to two NTC (Negative Temperature Coefficient)
probes. The cooler temperature is determined by measuring the temperature of either the return airflow or evaporator
temperature depending on where the customer prefers to fit the probe. This probe should be connected to the probe #1
connector.
The FCAx3 is a closed-loop temperature controller, turning the compressor OFF once the Cut-out set point has been reached
and then turning the compressor ON when the Cut-in temperature is reached. Users can set both the cut-in and cut-out values.
2.2 ENERGY SAVING
Commercial refrigeration is energy-hungry; With rising energy costs and growing environmental concerns, the FCAx3 allows
you to reduce energy consumption. You can:
• Cycle the Evaporator Fan: set the fan to cycle during operation as opposed to ON all the time.
• Temperature Setback Mode: Reduce the cooling demand by increasing the set temperature values. This will reduce how
hard the compressor must work and therefore reduce energy.
The setback is designed to be initiated when the store is closed. To activate Setback there must be no door activity for a
configurable set period.
2.3 DEFROST CONTROL
One of the primary functions of the FCAx3 controller is defrost management. The defrost cycle can be initiated or terminated
by either time or temperature (active).
Every system is different but usually, for the most efficient and satisfactory refrigeration operation, you would set the controller
parameters to initiate the fewest amount of defrosts in a day, for the shortest amount of time needed to clear the evaporator
of ice.
Usually, parameters will be set to terminate due to temperature with a fail-safe time backup to prevent prolonged defrost
because of defective defrost components or failures.
The FCAx3 supports Natural or Forced Defrost:
• Natural Defrost turns off the compressor and allows the evaporator to warm up normally.
• Forced Defrost turns the compressor and evaporator fan off and then turns a reverse fan to warm up the evaporator
quicker than natural defrost.
Standard operation during Defrost:
Natural Defrost Forced Defrost
Compressor: OFF Compressor: OFF
Evaporator Fan: ON Evaporator Fan: OFF
Reverse Fan or Heater: ON
2.4 VOLTAGE AND COMPRESSOR PROTECTION
The FCAx3 has built-in voltage protection including High / low voltage, spikes/surges, and frequency monitoring to protect
the controller and connected outputs to reduce equipment damage and downtime. The FCAx3 continually senses the mains
supply, on sensing bad voltage (voltage is higher or lower than the present acceptable limits) the FCAx3 will disconnect the
compressor and other connected outputs. Once the voltage becomes good, the FCAx3 will ensure the voltage remains good
for a set period (TIMESAVE™) before reconnecting power to the compressor and other connected outputs.
A minimum OFF period is essential in allowing compressor gases to neutralise, ensuring that the mains have stabilised before
re-connection and avoiding a locked rotor condition, however, any prolonged off time can affect cooler efficiency and or the
contents of the cooler. The FCAx3 will automatically adjust the reconnection period meaning the cooler will never be off for
longer than required.
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