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The sequence of opening and shutting down the chiller needs to ensure that the air conditioner host can run normally after startup and must ensure:
1 The condenser heats up well, otherwise the cold-condensing temperature and the corresponding condensing pressure will be too high, so that the chiller high-voltage protection device will stop and even cause a failure.
2 Evaporator cold water should be circulated, otherwise it will be cold water temperature is too low, resulting in cold water temperature protection device action and stop, or because the evaporation temperature and the corresponding evaporation pressure is too low, the chiller low pressure protection device action and stop, even Causes cold water in the evaporator to freeze and damage the equipment. Therefore, the chiller's starting sequence is: (must be strictly observed) cooling tower fan open -> cooling water pump open -> cold water pump open -> chiller open chiller shutdown sequence is: (must be strictly observed) chiller Stop -> cooling tower fan stop -> cooling pump stop -> cold pump stop.