You could use an availability schedule that turns off during days/hours you do not want cooling and call it from the thermostat object. The concern with this approach is that your zone may actually be above your 23c. You might want to try it with your availability schedule to turn off the chiller during cold seasons, and then plot the output variable for well mixed zone air temperature to see if the temperatures are above 23C.. If they are above 23, than that would explain why the chiller was on..
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If you are not using the thermostat type "dual setpoint with deadband" than you may have an issue where your heating and cooling are in a battle. You may wish to use this type of thermostat for all models, and have a deadband of at le
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