25
Unit Installation Requirements
• Thermal insulation: the chilled water pipe shall be thermally insulated to prevent water dripping due to heat loss and pipe surface
condensation. The exterior of the water-side parts in the water system in contact with the air shall be thermally insulated to prevent water
dripping due to condensation. The water system parts that may be damaged by freezing in winter shall be thermally insulated, and the
thickness of the insulation layer shall meet the requirement that freezing is not caused at the local minimum ambient temperature. Espe
cially for the make-up system pipeline of the gravity expansion tank or the automatic make-up valve pipeline of the pressure expansion
tank in the water system, sufficient insulation measures shall be considered or the pipeline shall be installed in a suitable place indoors to
avoid freezing damage.
• Anti-freezing: when the ambient temperature is low and the unit is not used for a long time, please drain off water in the unit to avoid
freezing damage to the water-side parts of the unit. If the water is not drained, do not cut off the power supply of the unit, so that the unit
can operate automatically against freezing. During the period, if there is a fault alarm that cannot be repaired within a short time, the
water must be drained. In winter, the water in the system of the single-chiller unit must be drained off to prevent the water in the system
from being frozen to damage water pipelines, pumps, heat exchangers and other main components of the unit. Other antifreezing
methods are not recommended. The unit damage caused by the non-recommended antifreezing methods are not within the scope of
warranty.
• Modular unit: Main leaving water temperature sensor(TH12): if the units are installed in modular mode, a place for installing the
temperature sensor must be reserved on the main outlet pipe of the water system, so as to install the outlet water temperature sensor
of the system.
• Pressure maintaining and leakage detection: after the installation and connection of water system pipelines, the water
pressure test shall be carried out. The accuracy of the pressure gauge shall be greater than 0.01MPa.The test pressure shall be 1.5
times the operating pressure. If the pressure is maintained together with the heat exchanger of the unit, the maximum pressure shall not
exceed 0.5MPa (i.e. the maximum operating pressure), so as to avoid damaging the parts on the cold water side of the unit. When water
is filled in the water system, the exhaust valve must be opened and closed after the air is exhausted and water is filled. If any leak is
found during the pressure maintaining process, repair it immediately and repeat the pressure maintaining test.
• Cleaning: the water system must be cleaned before unit starting and commissioning. During cleaning, the water system must be sep
arated from the unit and cleaned separately, and it can be connected to the unit for starting and commissioning only after there are no
impurities in the water system. In the process of unit operation, the Y-shaped water filter shall be cleaned regularly depending on the
cleanliness of the water system, so as to avoid the situations that the air conditioning effect is poor due to too small water flow, even the
water flow alarm of the unit occurs and the outlet water antifreezing alarm lamp has a failure to cause shutdown.
• Control wire of external pump: the external pump shall be equipped with a starter, and its control wire shall be connected to the pump
output port of the unit and link-controlled by the unit to ensure the automatic protection function of the unit.
