The control method of preventing over-temperature in the middle part of the condenser when DC frequency conversion multi-connected external units are refrigerated
A control method, DC frequency conversion technology, applied in heating and ventilation control systems, heating methods, household heating and other directions, can solve the problems of easy to burn out compressors, system fluctuations, lag, etc., to achieve reliable and stable continuous operation, reduce Maintenance cost, effect of reliable operation
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[0011] The present invention is further described in detail below through examples, but the present invention is not limited only to the following examples.
[0012] This embodiment is a control method for preventing over-temperature in the middle part of DC frequency conversion multi-connected external unit refrigeration, which mainly simulates high pressure through the temperature in the middle part of the outdoor middle condenser to realize reliable protection of high pressure in the system, and uses time to make up for the method of temperature lag and high pressure control The operation of the fixed frequency compressor and variable frequency compressor of the system.
[0013] Specific steps:
[0014] 1. Detect the middle temperature (Tc) of the outdoor condenser coil;
[0015] 2. When 59°C>Tc≥57°C, the variable frequency compressor of the system is forbidden to increase the frequency. If there is a fixed frequency compressor that is turned on at this time, the fixed fre...
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