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07/29/2020

Refrigerant filling

After the leak test of the refrigeration system is completed, it should be filled with refrigerant. However, the Freon refrigeration system must be vacuum dried before being filled with refrigerant. When the drying is not complete, the refrigerant cannot be filled.

08/27/2025

Variable Speed Compressor in Refrigerator

The differences between variable speed compressor and fixed speed compressor are their working principle and user experience.

07/07/2020

Earth Hour: Hitachi Central Air Conditioner works with you to speak for the earth

06/29/2020

Analysis of the cause of excessive suction temperature of compressor

Analysis of the cause of excessive suction temperature of compressor The high suction temperature is mainly due to the increase of superheat of suction. Note that high suction temperature does not mean high suction pressure, because the suction is superheated steam. Under normal circumstances, the compressor cylinder head should be half cold and half hot. If the suction temperature is too high, the cylinder head will all heat up.

08/07/2020

What are the central air conditioning performance that users care about

For any brand of central air-conditioning equipment, as a user, there are actually three points:

09/14/2020

Compressed air quality detection device

Okmarts.com recently developed a set of compressed air quality testing equipment that can detect the dust content, oil content and pressure dew point of compressed air online.

08/10/2020

Four anti-corrosion methods for heat exchangers

There are four main anti-corrosion methods for heat exchangers: corrosion-resistant materials, electrochemical protection, adding corrosion inhibitors, and anti-corrosion coating methods.

08/12/2020

How to deal with the water mist on the glass door of the refrigerated display cabinet

Once this season comes, many customers and friends who have bought glass-door refrigerated cabinets in convenience stores and supermarkets will worry again: the indoor humidity is high,

01/26/2024

Computer Room Air Conditioning: Work Principle, Characteristics and Technical Requirements, Benefits

Computer room air conditioners (CRACs), to put it simply, are air conditioners dedicated to computer rooms.

01/07/2021

The advantages and disadvantages of screw refrigeration compressor

The advantages and disadvantages of screw refrigeration compressor Compared with piston refrigeration compressors, screw refrigeration compressors have obvious advantages and disadvantages.