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Refrigeration-to-heating mode starting method of multi-split air conditioner

A multi-connected air conditioner and thermal mode technology, applied in heating methods, space heating and ventilation, household heating, etc., can solve problems such as frequent shutdowns, compressor burnout, and large differences in test conditions to ensure normal operation, Prolonged service life, avoids disorder effect

Active Publication Date: 2013-04-03
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2) Time A and time B are the values ​​determined by tests under limited working conditions in the laboratory, and the actual working conditions of the DC inverter multi-connected air conditioner in the project are varied, which is different from that in the laboratory. The test conditions are very different, therefore, the time A and time B determined in the laboratory cannot guarantee that the four-way valve can be successfully reversed under all working conditions.
[0007] 3) In addition, in the DC frequency conversion multi-connection system with multiple compressors connected in parallel, in addition to the DC frequency conversion compressor, there are other components, such as electronic expansion valves, four-way valves, indoor fan motors, outdoor fan motors and various Solenoid valves, etc., when the operation mode of the DC inverter multi-line is changed from the cooling mode to the heating mode, if the action relationship between these control components is not well coordinated, that is, the timing relationship of the control action, it will cause the entire DC variable frequency multi-line The system runs disorderly, which affects the reliability of the system, and even leads to frequent shutdowns, and more seriously, the compressor will be burned

Method used

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  • Refrigeration-to-heating mode starting method of multi-split air conditioner
  • Refrigeration-to-heating mode starting method of multi-split air conditioner

Examples

Experimental program
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Effect test

specific Embodiment 1

[0034] Specific embodiment 1: Only a single indoor unit receives the start-up command

[0035] 1) When the DC inverter multi-split air conditioner completes the defrosting process or the oil return process, the operating mode needs to change from cooling mode to heating mode. At this time, the electronic control system of the outdoor unit issues a start command;

[0036] 2) The gas bypass solenoid valve 10 is energized to start after receiving the start command, and after 60 seconds after opening, the gas bypass solenoid valve 10 is closed;

[0037] 3) After receiving the start command, the first oil return solenoid valve 4 is energized and opened, and the lubricating oil at the bottom of the first oil-gas separator 2 is sent back to the air return pipe of the first DC inverter compressor 1. After 30 seconds, The first oil return solenoid valve 4 is closed;

[0038] 4) After receiving the start command, the first DC inverter compressor 1 starts after a delay of 20 seconds, an...

specific Embodiment 2

[0047] Specific embodiment 2: multiple indoor units receive a power-on command

[0048] 1) When the DC inverter multi-split air conditioner completes the defrosting process or the oil return process, the operating mode needs to change from cooling mode to heating mode. At this time, the electronic control system of the outdoor unit issues a start command;

[0049] 2) The gas bypass solenoid valve 10 is energized to start after receiving the start command, and after 80 seconds after opening, the gas bypass solenoid valve 10 is closed;

[0050] 3) After receiving the start command, the first oil return solenoid valve 4 is energized and opened, and the lubricating oil at the bottom of the first oil-gas separator 2 is sent back to the air return pipe of the first DC inverter compressor 1. After 40 seconds, The first oil return solenoid valve 4 is closed;

[0051] 4) After receiving the start command, the first DC inverter compressor 1 starts after a delay of 30 seconds, and enter...

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Abstract

The invention discloses a refrigeration-to-heating mode starting method of a multi-split air conditioner. Coordinate control is performed according to different time intervals during which each part in an air-conditioning system runs at different times. Action time sequence of each part is sequentially and reasonably coordinated according to respective start time and start time interval of each part in the multi-split air conditioning system, so that a four-way valve is enabled to be successfully switched, the multi-split air conditioning system can be controlled in a normal and reliable running way, the disorder of running of the whole multi-split air conditioning system is avoided, a direct-current inverter compressor is enabled to normally run, and the service life of the direct-current inverter compressor is prolonged.

Description

technical field [0001] The invention relates to the technical field of air-conditioning control, in particular to a method for starting a cooling-to-heating mode of a multi-connected air conditioner connected in parallel with multiple compressors. Background technique [0002] During the operation of the DC inverter multi-split air conditioner throughout the year, it has to go through the operation of cooling mode, heating mode and mutual conversion. When the multi-connected air conditioner is running in the heating mode, the operation mode of the DC inverter multi-connected air conditioner needs to be changed from the heating mode to the cooling mode during the intelligent defrosting and oil return control operation, and after the intelligent defrosting and oil return control After the controlled operation, the operating mode is changed from cooling mode to heating mode. In the process of switching from the cooling mode to the heating mode, the switching of the operating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
Inventor 郑坚江程德威
Owner NINGBO AUX ELECTRIC
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