The bearing cooler cannot be rotated, mostly due to the lack of lubrication oil on the sliding bearing shaft, the burning of the shaft of the bearing bush, or the burning out of the blower motor coil. It may also be due to the fan operating time is too long, the current is large, the cold cabinet relay contacts work poorly and the output circuit of the copper clad board is blown.
First, sliding bearing shaft lack of oil
In use, when the condenser fan does not rotate, it may first use a multimeter to check if the fan motor coil is burned out. If the motor coil is in good condition, check whether there are any traces of oil in the fan motor's tail bearing. If there is no oil trace, it means that the sliding bearing is short of oil.
Second, the lack of refrigerant
In use, the refrigeration system was found to have insufficient cooling capacity, and when the refrigeration system refrigerant was suspected to be insufficient, the manifold pressure gauge could be used to check the system pressure.
If the pressure on the high and low pressure side is low (high pressure is lower than 83kpa and low pressure is lower than 78kPa), there are bubbles in the liquid glass window and the gas in the air outlet is not cold, indicating that the system refrigerant is insufficient.
Treatment method: identify the cause of the leak, repair the leak, and replenish the refrigerant to the system. Let the engine run at 200r/min until the bubble disappears. The low pressure side of the pressure gauge reading is about 118 to Z16kpa, and the high pressure side is about 1274 to 1596kpa.
Third, poor condenser cooling
The poor cooling of the condenser in the refrigeration system is mostly due to the blocking of engine fins and condenser fins with dust and debris. When checking, the manifold pressure gauge can be used to check the system pressure. If the reading of the high pressure gauge is high, at the same time, dust and debris accumulate at the engine fins and the condenser fins, indicating that the condenser is not cooling properly.
Treatment: Remove dust and debris that accumulate at the engine fins and condenser fins.