How to repair a water-cooled chiller

How to repair and maintain water-cooled chillers? Daily repair and maintenance of chillers

Guarding project:

1. Unit vacuum and airtightness inspection guard

2. Cleaning of solution cavity, regeneration and purification of lithium bromide solution

3. Inspection and protection of pumps, vacuum pumps, and frequency converters,

4. Replace and clean the heat exchange copper tube, and replace the nozzle,

5. The crew has mastered the inspection and replacement of system components, and has advanced and innovated the system,

6. Unit installation, renovation, commissioning, and annual maintenance of the entire machine,

7. Provide spare parts, lithium bromide solution, corrosion inhibitors, and energy enhancers

8. Cleaning and pre film maintenance of unit heat exchange copper tubes. Short term shutdown and maintenance of refrigeration machines is based on changes in fluid basic condition parameters and the surface heat transfer process of substances, and follows the rules of refrigerant characteristics and thermal condition changes to carry out refrigeration cycles. It has high requirements for the vacuum degree of the unit. It is essential to provide daily protection and maintenance for the crew,

Its main content is:

1、 When the short-term shutdown maintenance downtime is within 1-2 weeks, the maintenance work is mainly to maintain the vacuum degree of the unit. The vacuum level should be monitored twice a day in the morning and evening. For accuracy, start the generator pump and absorber pump for 10 minutes before investigating the pressure measuring instrument, and then investigate the instrument readings and compare them with the previous one.

2、 Long term shutdown maintenance: During long-term shutdown, all refrigerant water in the evaporator should be bypassed to the absorber, and the solution should be evenly diluted to prevent crystallization at ambient temperature. There is no unified regulation on maintenance techniques during downtime, and two types of maintenance techniques are generally accepted: vacuum and nitrogen filling. Nitrogen filling maintenance is to fill the unit with nitrogen gas at a pressure of about 49kPa (gauge pressure) when the unit is confirmed to be leak free, so that it is always in a positive pressure state. This ensures that the unit will not leak air even if there is a leak, and leakage can be detected at any time, which is very convenient. Its disadvantage is that due to the relatively complex layout process of the unit, it is difficult to remove nitrogen gas at once. The cooling system does not meet the requirements when starting up, and it is necessary to continue starting the vacuum pump to evacuate. Other expenses also require funds for purchasing nitrogen.