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Firstly, go thoroughly on HVAC Symbols....then, Follow Duct Flow, Identify & Analyze Duct Size,Air Velocity on HVAC Drawings..
First of all HVAC designer should already know HVAC and AutoCAD well.
Any AutoCAD drafter has to work using different layers, and do it wisely. They have to know how to work with external references and layouts, and be ready for new ideas of solving various problems.
That is why it is very important to work in a team. Being in touch with other designers helps to do work correctly and allows to learn something new.
Also if person wants to be expert in AutoCAD HVAC drawings they have to study all the time. Nowadays there are plenty of different on-line Internet-based courses which could help to improve drafter's knowledge.
HVAC design and Drafting it depends on Limits, Paper Size and Symbols, then after only we go to Commands Drawings. Initially first study the Drawing or Design Requirements. It will guide you with out any help.
Get familiar with the symbols used in HVAC and shortcuts used in autocad
when we get the correct quantity of ducts in a network we are HVAC expert in AutoCAD
Learn symbols ,Systems, Imagine and practice it on AutoCAD
In order to be an expert in any drawing any system, not just HVAC you first have to study architecture and special symble that the system will draw it and then the study design and then start the work for you
Should practise all the autocad command every day and keep well knowledge about HVAC symbol and notations as per the local or international standards.
HVAC drawings are not that complicated like of a architetural design, First of all we need to have the cfm supply in the AHU for us to know what duct sizes to be use using ductulator or tables and charts. Second consult the architect, civil and electrical for you not to conttradict with their plans. You should cooperate as a team.
