8
Electronic Controller
Service Manual
SKOPE OD260
Running the Chiller
Operating
Modes
The electronic controller runs the chiller in constant ‘Normal’ mode. The
OD260 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 10, or “Messages and Alarms” on page 9 for more
information.
Compressor
and Fans
The compressor and condenser fan will start just after the chiller is turned
on. The compressor and condenser fan will stop when the control probe
temperature reading reaches 2.0°C (parameter St), and on again when it
reaches 4°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.
Refer to page 37 for service information.
Defrost Cycle
The defrost cycle will begin after 2 hours (parameter dl) of compressor run
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°C (parameter dt), or after the defrost cycle has been
running for 30 minutes (parameter dP).
Lighting
Press the Light button on the electronic controller faceplate to manually
switch the lights on and off.
