Automatic Portable Air Cooled Chiller

Common faults

1. The evaporation pressure is too low:

reason:

(1) The amount of cold water is insufficient.

(2) Less cooling load.

(3) Throttle orifice failure (only low evaporation pressure).

(4) The heat transfer tube of the evaporator deteriorates due to pollution such as scale (only the evaporation pressure is too low).

(5) The amount of refrigerant is insufficient (only the evaporation pressure is too low).

Solution:

(1) Check the cold water circuit to make the cold water volume reach the rated water volume.

(2) Check the setting temperature of the automatic start-stop device.

(3) Check whether the expansion throttle tube is unblocked.

(4) Clean the heat transfer tube.

(5) Replenish the refrigerant to the required amount.

2. Condensing pressure is too high:

reason:

(1) The amount of cold water is insufficient.

(2) The capacity of the cooling tower is reduced.

(3) The cold water temperature is too high and the refrigeration capacity is too large, which increases the condenser load.

(4) There is air.

(5) The heat transfer of the condenser tube is deteriorated due to pollution such as scale.

Solution:

(1) Check the cooling water circuit and adjust to the rated flow.

(2) Check the cooling tower.

(3) Check the expansion throttling tube, etc. to make the cold water temperature approach the rated temperature as soon as possible.

(4) Carry out air extraction operation to remove air. If the air extraction device needs to operate frequently, it is necessary to find out where the air leaks and eliminate it.

(5) Clean the pipe.

3. Low oil pressure difference:

reason:

(1) The oil filter is blocked.

(2) The opening of the oil pressure regulating valve (oil drain valve) is too large.

(3) The output of the oil pump is reduced.

(4) Bearing wear.

(5) The oil pressure gauge (or sensor) fails.

(6) There is too much refrigerant mixed in the lubricating oil (the oil pressure is too low due to the oil foaming at startup).

Solution:

(1) Replace the oil filter element.

(2) Close the oil pressure regulating valve to increase the oil pressure to the rated oil pressure.

(3) Disassembly inspection.

(4) Replace the bearing after disassembly.

(5) Check the oil pressure gauge, recalibrate the pressure sensor, and replace if necessary.

(6) After the refrigerator is stopped, be sure to turn on the oil heater to maintain the given oil temperature (confirm whether the oil heater is disconnected, and whether the setting value of the oil heater temperature control is correct).

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