WARNING: The installation manual instructions are intended as an aid to qualified service personnel for proper installation, adjustment and operation. Read these safety requirements thoroughly before attempting installation or operation. It is the responsibility of the installer to follow all national codes, standards and local ordinances. The installation must comply with regulations of the local building, heating, plumbing, and other codes. where local codes are not applicable, the installation must comply with the national codes and any and all authorities having jurisdiction. Failure to follow these requirements may result in improper installation, adjustment, service or maintenance, possibly resulting in fire, electrical shock, carbon monoxide poisoning, explosion, property damage, personal injury or death.