求翻译：暖通空调设计内容复杂的单元（主项）应以暖通空调流程图表示暖通空调系统的空气处理过程和控制流程是什么意思？

HVAC design of complex unit (main) said that the HVAC system, air processing and control processes should be based on the HVAC flowchart

Heating, ventilation, and air conditioning design complexity of the unit (primary) should be in heating, ventilation, and air conditioning process diagram represents the heating, ventilation, and air conditioning system air-handling processes and control processes

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Heating, ventilation and air conditioning system design for complex unit (item) should flow chart of heating, ventilation and air conditioning HVAC air handling process and control of system processes

Warmly passes the air conditioning design content complex unit (basic term) to be supposed by to pass the air conditioning flow chart to express warmly passes the air-conditioning system warmly the air treating processes and the control flow