Disclaimer: The information contained here is intended for educational purposes to the qualified HVACR technician only! It is not intended to replace formal schooling or to make someone an HVACR technician. Always refer to and follow safety and operating instructions in relevant installation/operation/service manuals, which may include safety warnings and procedures different from/in addition to those addressed here. By continuing on, you are stating that you are a qualified HVACR technician and that you have read and understand these instructions. If you are an end-user you will need to call your local HVACR professional!