Chiller system and air-conditioning apparatus including chiller system

A chiller system comprising:

• a chiller configured to output water at an adjusted temperature;
• a load of the chiller;
• a feed pipe through which water flows to be supplied from the chiller to the load, the feed pipe being connected between the chiller and the load;
• a return pipe through which water flows back to the chiller from the load, the return pipe being connected between the chiller and the load;
• a first controller configured to control the chiller;
• and
• a second controller configured to output a chiller operating command to control the chiller to the first controller, wherein
• the chiller includes
• a first sensor configured to measure an inlet water temperature of the water flowing through the return pipe to the chiller,
• a second sensor configured to measure an outlet water temperature of the water flowing through the feed pipe from the chiller, and
• a third sensor configured to measure an outside air temperature at a location where the chiller is installed, and
• the first controller includes at least one processor and/or at least one circuit configured to
• calculate a temperature range that is operational for the chiller based on the inlet water temperature measured by the first sensor, the outlet water temperature measured by the second sensor, and the outside air temperature measured by the third sensor, and then output the temperature range which is calculated to the second controller, wherein in the temperature range that is operational the chiller operates such that the outlet water temperature of the chiller becomes a target outlet water temperature.