Schematic diagrams for HVAC systems can be found on Electrical-Knowhow.com and HVACTrainingSolutions.com. These two websites are among the many resources that provide HVAC schematics along with instructions for reading them.
Developing the skill to read and understand HVAC schematics is challenging, according to HVACtTrainingSolutions.com. Knowing how to read and understand HVAC schematics is a skill that HVAC technicians must master in order to be efficient and successful. YouTube.com is another great resource that provides videos explaining how to read schematics and apply the information to the job at task. HVAC systems come with a manual that include a schematic drawing of the system to assist technicians with troubleshooting for repairs and upgrades.