Six protection devices for air-cooled chiller refrigeration compressors

1. Thermostat

In order to prevent the uninterrupted operation of the air-cooled chiller during hours, resulting in high-load operation of the compressor, defective electromagnetic switch, overcurrent caused by shaft holding, or motor burnout caused by the temperature of the motor, the compressor is installed inside the compressor. The thermostat, which is installed on the neutral contact of the three-phase motor, protects the motor by cutting off the three phases at the same time when an abnormality occurs.

Two, electromagnetic switch

The electromagnetic switch is to control the operation of the refrigeration compressor of the air-cooled chiller of the air-cooled chiller, and the switch is to be stopped for the purpose of stopping, and the installation must be kept vertical. If the installation is wrong, the pressure of the node spring will change and noise will be generated. , Resulting in lack of phase operation, for the compressor models equipped with a direct power-off protector, there is no need to load a protector.

Three, reverse phase protector

Scroll compressors and piston compressors have different structures and cannot be reversed. Because the three-phase power supply of the air-cooled chiller will cause the compressor to reverse phase, it is necessary to install a reverse phase protector to prevent the refrigeration compressor from reversing. . After installing the reverse phase protector, the compressor can run in the normal phase, but not in the reverse phase. When the reverse phase occurs, the two wires of the power supply can be changed to the normal phase as long as the two wires are reversed.

Four, exhaust temperature protector

In order to protect the compressor under high load operation or insufficient refrigerant, the air-cooled chiller system needs to be equipped with an exhaust temperature protector, and the exhaust temperature is set to 130°C to stop the compressor , This temperature value refers to the compressor exhaust pipe from the outlet.

Five, low voltage switch

In order to protect the compressor of the air-cooled chiller from running when the refrigerant is insufficient, a low pressure switch is required. When the setting is above 0.03mpa, the compressor will stop running. Once the compressor is running under the state of insufficient refrigerant, the temperature of the compressor part and the motor part will rise instantaneously. At this time, the low-pressure switch can be used for compressor damage and motor that cannot be protected by the internal temperature device and the exhaust temperature protector. Burn it for protection.

Six, high voltage switch

The compressor can be stopped when the high-pressure pressure rises abnormally, and the operating pressure is set below.