1. Lack of cooling water
2. The capacity of the cooling tower is reduced
3. The heat load is too large, and the return temperature of the chilled water is too high, which increases the load on the condenser
4. There is air
5. The heat transfer deteriorates due to the contamination of the condenser tube due to scale etc.

What are the possible reasons for the reduction of the oil level in the operation of the hydraulically driven centrifuge?
1. Because the refrigerant dissolves in the oil, the refrigerant evaporates and foams when starting, and the oil is sucked away by the compressor;
2. The amount of oil added is too much, and the balance pipe from the upper part of the gear box is sucked away by the compressor;
3. The venturi nozzle and filter are blocked by foreign objects, and the oil separated from the refrigerant purification equipment cannot be returned to the fuel tank;
4. The oil pressure is adjusted too high during operation.
What are the common faults and causes of centrifuge motors?
(1) Motor oscillation: the rotor of the motor is not concentric with the stator or the air gap is uneven, the motor is not installed correctly, the main shaft is deformed, the bearing is worn, the stator turns short circuit, the rotor squirrel cage is cracked or the compressor mechanical vibration is moved, etc.
(2) Poor starting: faulty power line wiring, faulty wiring or starting equipment, inconsistent operating voltage or power frequency, excessive load torque or cracking of squirrel cage bars, etc.
(3) The motor is overheated: the supply of the motor cooling medium is insufficient or interrupted, the terminal voltage of the motor deviates from the rated value, the winding insulation is damaged, and the unit is severely overloaded. But the motor winding overheating is not necessarily the motor over (over) load.