How to maintain lithium bromide units in winter

1. Drain the water, which includes removing cold water, cooling water, hot water (steam condensate in the case of steam-powered units), as well as all water that is in contact with the unit. Note that it is essential to ensure that no leaks occur once the relevant valves are closed; otherwise, a drain valve must be installed at the lowest point of the pipeline and kept open so that any leaking water can flow out and not enter the lithium bromide unit. 2. Electrical aspects, including damage to electronic components such as sensors, and the insulation condition of the pump’s motor. 3. Oil change – this is something that most users of lithium bromide units often overlook. Since the old oil contains water, leaving the machine idle for a long time will cause corrosion of the vacuum pump body 4; the solution is then pumped into the evaporator. This process is rather complicated to handle, as different manufacturers use different methods for processing; it is best to leave it to professional technicians. A rather cumbersome method is to draw out some of the solution from the outlet of the chiller’s solution pump during summer when the chiller is operating at full capacity and store it (in units equipped with variable frequency drives for the solution pump, it may not be possible to draw out the solution during periods when the chiller is not operating at full capacity), and then inject it into the evaporator when the chiller is shut down in winter. If it’s not possible to do the above, then one has to install a radiator or heater, mainly to prevent the coolant pump and the pipes connected to it from freezing. In this way, even during the cold winters in the north, it is possible to prevent the solution inside the machine from crystallizing, ensuring that it can operate normally again in the following year. As for vacuum levels, for lithium bromide units that are not maintained by filling them with nitrogen, it is necessary to keep track of the vacuum reading on the unit’s generator; should any changes be detected, immediate action should be taken to reduce the vacuum level, and the refrigeration equipment manufacturer should be consulted regarding the next steps to take. For other references, check this: http://wenku.baidu.com/link?url=ER2bDkhcnrh7y_ReiSnxJrr8KpAS6wvhht1X7KgHJtECd5PM31mS-0FXaooXyVzEs4rVZh-TyHX1RD8GqllYbdA7DPWdsbfc70dDbUoAT5_

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