12
Electronic Controller
Service Manual
SKOPE BackBar X
Running the Chiller
Operating
Modes
The electronic controller runs the chiller in constant ‘Normal’ mode. The
BackBar X does not use an energy saving/night mode (or similar).
Note:
Normal mode is suitable for perishable product (all shelves maintain
temperature below 5°C).
During some conditions or refrigeration system alarms, the electronic
controller may run the chiller in cold climate protection mode, or may shut
down the lights and/or refrigeration system. Refer to “Cold Climate
Protection” on page 14, or “Messages and Alarms” on page 13 for more
information.
Compressor
and Fans
The compressor and condenser fan will start approximately just after the
chiller is turned on. The compressor will stop and the condenser fan will run
at low speed when the control probe temperature reading reaches 1°C
(parameter St). The compressor will start and the condenser fan will run at
full speed when the temperature reaches 3°C (parameter St + rd).
The evaporator fan starts approximately 3 seconds (parameter F0) after the
compressor and condenser fan. To verify, check that the FAN light is lit on
the electronic controller faceplate.
Temperature
Probes
Three temperature probes feed data to the electronic controller: the control
probe, the evaporator probe, and the condenser probe.
The control probe monitors and controls the chiller temperature, provides
the chiller temperature for the electronic controller to display, and notifies the
electronic controller of any erratic or abnormal temperatures that could
identify an issue within the refrigeration system.
The evaporator probe controls the refrigeration system defrost initiation and
termination.
The condenser probe monitors the refrigeration system condenser
temperature and notifies the electronic controller of any abnormally high
temperatures that could identify an issue within the refrigeration system.
Defrost Cycle
The defrost cycle will begin after 6 hours (parameter dl) of real time. During
the defrost cycle the compressor stops and the evaporator fan runs
continuously. The defrost cycle will terminate when the evaporator probe
reaches 4.5°C (parameter dt), or after the defrost cycle has been running for
45 minutes (parameter dP).
Lighting
Press the Light button on the electronic controller faceplate to manually
switch the lights on and off.
