Part No. 11110.Rev.1.04 March 2022 Printed in CanadaXGB SeriesExplosion-Proof Forced Air Unit HeaterInstallation, Operation, & Maintenance InstructionsGlycol Free DesignSpecial NotesThe following special notices highlight importantinformation in the installation, operation and maintenancesections.This symbol indicates a potentially hazardoussituation, which, if not avoided, can result inpersonal injury or damage to the equipment.This symbol indicates a potentially hazardoussituation, which, if not avoided, may be a shockhazard.This symbol indicates an imminently hazardoussituation, which, if not avoided, could result indeath or serious injury.CAUTIONCAUTIONWARNINGWARNINGWARNING. Improper installation adjustment,alteration, excessive vibration, service, ormaintenance can cause property damage,injury or death. Read the installation, operatingand maintenance instructions thoroughlybefore installing, operating or servicing thisequipment.