The sequence of starting and stopping the chiller must ensure the normal operation of the air-conditioning host after starting, and the following points must be ensured:
1. The condenser has good heat dissipation. Otherwise, the high-pressure protection device of the industrial chiller will stop due to the excessively high condensing temperature and the corresponding condensing pressure, or even cause a malfunction.
2. The cold water in the evaporator should circulate. Otherwise, the cold water temperature protection device will stop due to the low temperature of the cold water, or the low pressure protection device of the chiller will stop because the evaporation temperature and corresponding evaporation pressure are too low. It even causes the cold water in the evaporator to freeze and damage the equipment. Therefore, the sequence of starting the chiller is: (must be strictly followed) cooling tower fan is turned on -> cooling water pump is turned on -> chilled water pump is turned on -> the chiller is turned on. The stopping sequence of the chiller is: (must be strictly followed) Stop——>The cooling tower fan stops——>The cooling water pump stops——>The cold water pump stops.
Precautions for maintenance of chiller
1. When shutting down, the industrial chiller should be shut down half an hour before get off work, and the chilled water pump should be shut down after get off work, which is conducive to saving energy, while avoiding downtime and protecting the unit.
2. Before running the refrigeration cycle, it should be confirmed that all the valves of the heating cycle pipeline have been closed.
3. When the air-cooled chiller unit is turned on, it should be checked whether the rotation of the fan is correct. If it is turned on and it can be turned on, it means that the power connection is reversed, and the phase sequence must be replaced before starting.
4. For water-cooled chillers, keep the heat dissipation tower clean, and keep the air around the tower circulated, and the temperature is low, to prevent debris from entering the cooling tower to reduce the heat dissipation efficiency.
5. If the chiller has been used for more than six months, or the high/low pressure switch frequently fails, or the cooling capacity is reduced, please arrange for staff to clean the condenser. If you follow the above instructions for repairs several times and the chiller failure alarm still sounds, you should ask a professional chiller to repair it.