Proper maintenance of chillers is crucial to ensure the stable and efficient operation of Hanli chillers, especially in spring and summer. These measures help prevent overheating of the unit, reduce downtime, and extend its service life.

1. Clearance and Ventilation: Quantitative Standards + Dynamic Monitoring

Clearance requirements: A clearance of more than 1.5 meters must be maintained around the unit (especially on the air inlet and outlet sides) without any obstructions (such as walls, stacked objects, green plants, etc.) to ensure smooth natural air circulation. If there are obstacles on the top (such as eaves, pipes), the distance must be ≥ 1 meter to avoid hot air recirculation.

Ventilation monitoring: During high temperatures in spring and summer, a thermometer can be used to measure the exhaust air temperature at the air outlet of the unit. Normally, it should be 8-12°C higher than the ambient temperature. If the temperature difference exceeds 15°C, it indicates that ventilation is blocked, and the surrounding obstacles must be cleared immediately.

2. Environmental Protection: Targeted Response to Spring and Summer-specific Risks

Preventing catkins/dust: Spring is a period with a high incidence of catkins and pollen. A detachable filter cover (mesh size ≤ 2mm) must be installed at the air inlet of the unit. Daily inspections should be carried out to manually clean the attached flocculents to prevent them from entering the condenser and blocking the fins.

Preventing high-temperature exposure: If the unit is installed in an open area, a sunshade shed should be built (the distance between the shed roof and the unit top should be ≥ 50cm to ensure heat dissipation) to avoid direct sunlight causing an increase in condensation temperature (for every 1°C increase, energy consumption increases by about 2%).

Moisture and corrosion prevention: During the plum rain season, check the anti-rust coating on the unit shell and pipeline interfaces. If there is damage, repair it in time. Desiccants can be placed in the electrical control cabinet, and checked once a month to prevent short circuits due to moisture in the lines.

3. Cleaning of Core Components: Frequency + Operation Specifications

Air filter:
Check at least once a week in spring and summer. If the surface dust/catkins coverage exceeds 1/3, it must be cleaned immediately: rinse gently with clean water (or add neutral detergent), avoid vigorous rubbing to damage the filter. Reinstall after drying (do not expose to direct sunlight). It is strictly forbidden to operate with a wet filter (which will cause a sudden increase in air inlet resistance and damage the fan).
If the unit is located in an area with high dust concentration (such as near a construction site), it is recommended to replace the spare filter once every 2 weeks.

Condenser:

Air-cooled type: Rinse with a high-pressure water gun (pressure ≤ 3bar, distance between the gun nozzle and the fins ≥ 30cm) from the upwind direction (i.e., from the air outlet to the air inlet direction) every 2 weeks to avoid pressing dust into the deep layers of the fins by flushing in the forward direction. If there are stubborn catkins/oil stains between the fins, first soak them with a special fin cleaning agent (neutral) for 10 minutes, then rinse.

Water-cooled type: Test the cooling water quality monthly (PH value must be maintained at 7-8.5, hardness ≤ 200mg/L). If it exceeds the standard, add scale inhibitors. Open the end cover every 3 months and use a tube cleaner to clean the scale on the inner wall of the copper tube (if the scale thickness is ≥ 0.5mm, the heat exchange efficiency will decrease by more than 30%). In severe cases, chemical circulation cleaning is required.

4. System Operation Inspection: Early Troubleshooting of Potential Failures

Refrigerant pressure: After the unit has been running for 30 minutes, check the condensing pressure (normal range in spring and summer: 1.8-2.2MPa for air-cooled type, 1.4-1.8MPa for water-cooled type). If the pressure is abnormal (too high may be due to poor heat dissipation, too low may be due to leakage), stop the unit for inspection: first check the cleanliness of the condenser, then use a leak detector to check the interfaces (focus on valves and welds), and charge refrigerant according to standards after leak repair.

Compressor status: Listen to the operating sound (there should be no sharp abnormal noise), feel the shell temperature (normally not exceeding 90°C), and measure the current (must be within ±10% of the rated current). If there is abnormal noise, overheating, or excessive current, it may be due to poor lubrication. Check the oil level (above the middle line of the oil sight glass) and oil quality (normally light yellow; if it turns black/emulsified, the refrigerating oil must be replaced immediately).

Control logic: Test the sensitivity of the thermostat, high-pressure protection switch, and water flow switch (for water-cooled type): artificially simulate over-temperature/water cut-off conditions to observe whether the unit can stop immediately for protection, so as to avoid overload damage to the unit due to protection failure.

5. Trial Operation After Maintenance: Confirm That Parameters Meet Standards

After cleaning or maintenance, start the unit and run it for more than 1 hour, and record the key parameters:

 

Outlet water temperature (deviation from the set value ≤ ±0.5°C);

Temperature difference between inlet and outlet air (≥8°C for air-cooled type, ≥5°C for water-cooled type);

No vibration, no leakage, and no peculiar smell in all components.

 

Only when all parameters are normal can the unit be put into formal operation.

 

Through the above detailed operations, the problems such as unit overheating and efficiency reduction caused by environmental factors in spring and summer can be effectively reduced, and the stable output of refrigerating capacity can be ensured while extending the service life.