Multi-connected air conditioner system and fault detecting method of bypass valve of multi-connected air conditioner system

Abstract

The invention discloses a fault detecting method of a bypass valve of a multi-connected air conditioner system. The fault detecting method comprises the following steps that after the multi-connected air conditioner system receives a detection instruction of the bypass valve, the multi-connected air conditioner system is controlled to enter a test running refrigerating mode; a compressor is controlled to run at preset frequency, and only the bypass valve is controlled to be in a starting state; and the temperature value of an air return opening of the compressor and / or the pressure value of the air return opening of the compressor are / is obtained, and whether a fault happens to the bypass valve or not is judged according to the temperature value and / or the pressure value. According to the method, whether the bypass valve between an exhaust opening and the air return opening of the compressor works normally or not can be effectively and conveniently detected, and therefore the situation that the air return overheating degree of the air return opening of the compressor is too small, consequently, liquid impacts of the compressor are caused, and high-pressure protection happens to outdoor units due to too high exhaust temperature of the compressor can be effectively avoided, and then safe and reliable running of the multi-connected air conditioner system is guaranteed. The invention further discloses the multi-connected air conditioner system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a fault detection method for a bypass valve body in a multi-connection system and a multi-connection system. Background technique [0002] Usually, in a multi-connected system, a bypass valve body is provided between the discharge port of the compressor and the return port of the compressor. During the operation of the multi-connected system, when the return air superheat of the compressor is relatively small, in order to prevent the compressor from liquid hammering, it is necessary to control the opening of the bypass valve body to directly bypass the high-pressure exhaust to the low-pressure suction side, which can Continuously increase the temperature of the suction side; when the exhaust temperature of the compressor is too high, by controlling the opening of the bypass valve body, the high-pressure exhaust can be bypassed to the low-pressure suction side to reduce t...

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Problems solved by technology

[0003] However, when the bypass valve body fails, for example, due to welding slag flowing into the bypass pipe in the welding process or metal debris stripped from the pipe wall due to long-term operation and blocked in the bypass valve body, it will cause system failure. not functioning properly

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