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Control method for start-up heating mode of screw compression multi-connected central air conditioner

A technology for screw compressors and central air conditioners, which is applied in the field of start-up control of screw-type compression multi-connected central air conditioners in the heating mode, can solve the problems of unseen stability and reliability start-up methods, and achieve good start-up stability and reliability , mutual relationship coordination, and the effect of protecting the compressor

Active Publication Date: 2011-11-30
NINGBO AUX ELECTRIC
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Problems solved by technology

[0003] Although the screw-type compression multi-connected central air conditioner has great advantages, how to control its safe and reliable start-up in the heating mode has not been seen in the prior art with good stability and reliability. The start-up method It has become one of the hotspots in the study of screw compression multi-connected central air conditioners

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  • Control method for start-up heating mode of screw compression multi-connected central air conditioner
  • Control method for start-up heating mode of screw compression multi-connected central air conditioner

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Embodiment Construction

[0040] The heating mode start-up control method of the screw-type compression multi-connected central air conditioner of the present invention, when the outdoor unit control unit receives the heating start-up signal, executes the following start-up process:

[0041] (1) When the control unit confirms that the oil temperature of the screw compressor 1 is ≥ T0 through the detection of the oil temperature sensor 1.1, and the value range of T0 is 20-25°C, the control unit controls the unloading solenoid valve 2 to open to adjust the high pressure of the system and the pressure difference of the low pressure;

[0042] (2) When the absolute value of the pressure difference between the high pressure and low pressure of the system is less than or equal to the startup threshold, the startup threshold varies with different refrigerants and can be obtained through on-site testing. For example, the startup threshold of R22 refrigerant is generally 0.13MP, The starting threshold of R410a r...

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Abstract

The invention discloses a control method for starting a heating mode of a screw-type compressed multi-connected central air conditioner. The control method has good stability and reliability. Accurate actions of each key component can be controlled in startup process, the effects of harmonious interrelation and good startup stability and reliability can be achieved. Experimental results show thatthe stability and reliability of the startup both reach a higher level.

Description

technical field [0001] The invention relates to the technical field of air conditioning systems, in particular to a method for controlling start-up of a heating mode of a screw-type compression multi-connected central air conditioner. Background technique [0002] At present, there is a screw-type compression multi-connected central air conditioner, which breaks through the limitations of the existing conventional VRV modular combination multi-connected air conditioners, that is, the outdoor unit capacity of the screw-type compressed multi-connected central air conditioner ranges from 60HP, 70HP, 80HP, 90HP, 110HP, 125HP, etc., the maximum capacity of the outdoor unit with three screw compressors connected in parallel can reach 400HP, which breaks through the limitation that the maximum capacity of the conventional VRV multi-connected air conditioner is only 64HP; at the same time, the screw compressor multi-connected central There is no combination of basic modules in the a...

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Application Information

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IPC IPC(8): F24F11/00
Inventor 郑坚江程德威姜灿华
Owner NINGBO AUX ELECTRIC
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