1、 Daily inspection: the core link of basic maintenance

Environmental safety inspection

Ventilation and hygiene: Ensure that there is no accumulation of flammable and explosive materials around the equipment, reserve at least 0.5 meters of operating space, and keep the ventilation openings unobstructed. Clean the surface dust of the equipment daily to avoid dust accumulation affecting heat dissipation.

Rainproof and moisture-proof: During rainy seasons, it is necessary to check the sealing of key components such as the main control electrical appliances and junction boxes to prevent short circuits caused by water ingress.

Electrical system inspection

Power supply and circuit: Check the stability of the power supply voltage daily (fluctuation range ≤ ± 5%), use explosion-proof instruments to monitor the current, and avoid overload operation. Check whether the wires, plugs, and sockets are intact, without aging or damage.

Explosion proof components: Confirm that the explosion-proof shell is not corroded or deformed, and the explosion-proof surface is intact; The ventilation opening is unobstructed; Grounding resistance ≤ 4 Ω (in accordance with GB 3836 standard).

Refrigeration system inspection

Pressure and liquid level: Observe whether high and low pressure are normal through a pressure gauge, and the refrigerant liquid level should be at 1/2-2/3 of the sight glass.

Leak detection: Dip a soft cloth in soapy water and apply it to the pipeline joints, valves, and other parts to observe for the formation of bubbles. Focus on checking the connections of the compressor and condenser.

Waterway system inspection

Water quality and flow rate: Double distilled water or purified water should be used for cooling water, which should be replaced once a month, and the filter element should be replaced every 90 days. Check the water level in the water tank and the operation status of the water pump daily to ensure smooth water flow and no impurities.

Heat dissipation effect: Clean the dust accumulation on the condenser fins (once a month), check whether the cooling tower fan and nozzle are running normally.

2、 Regular maintenance: a key measure to prevent malfunctions

Quarterly maintenance (every 3 months)

Component replacement: Replace the air filter, check the condition of the compressor lubricating oil (clear oil color, no impurities), and test the dynamic balance of the fan.

Deep cleaning: Clean the scale of the condenser/evaporator (using specialized cleaning agents), calibrate the accuracy of pressure and temperature sensors (error ≤± 1%).

Annual maintenance (once a year)

Electrical performance testing: measure electrical insulation performance (≥ 0.5M Ω), check the working status of control switches, relays, contactors and other components.

Explosion proof performance re inspection: Entrust professional organizations to inspect explosion-proof enclosures, seals, junction boxes, etc., to ensure compliance with ATEX or IECEx certification requirements.

Special inspection of key components

Compressor: Listen to the sound to determine if the operating sound is abnormal, monitor the current load (within ± 10% of the rated current), and regularly replace the lubricating oil and filter.

Safety device: Test the response time of safety valves, pressure controllers, and high and low temperature protection switches to ensure timely triggering of protection in case of abnormal conditions.

3、 Fault prevention: standardized operation and emergency response

Operating Specifications

Start sequence: Start the cooling water pump first, then start the compressor; When shutting down, turn off the compressor first, and then turn off the water pump.

Parameter monitoring: Real time monitoring of unit status and recording of operating data through temperature and pressure sensors.

Exception handling process

High pressure alarm: Check for poor heat dissipation in the condenser (dust accumulation, insufficient water flow), excessive refrigerant, clean the condenser and adjust the refrigerant charge.

Low temperature malfunction: Check if the evaporator is frosted, if the sensor is off center, thaw the evaporator or calibrate the sensor.

Abnormal noise/vibration: Immediately stop the machine, check if the compressor bearings, fan blades, and water pump impeller are worn or loose, and replace damaged parts.

Shutdown and long-term idle processing

Short term shutdown: Turn off the power supply of the unit, but keep the cooling water circulating to prevent scaling.

Long term idle: Drain the water from the unit, add antifreeze, turn off the main power and cover with a dust cover.