2DANGER: Indicates the presence of immediate hazards which will cause severepersonal injury, death or substantial property damage if ignored.WARNING: Indicates the presence of hazards or unsafe practices which could causesevere personal injury, death or substantial property damage if ignored.CAUTION: Indicates the presence of hazards or unsafe practices which could causeminor personal injury or product or property damage if ignored.NOTE: Indicates special instructions on installation, operation, or maintenance whichare important but not related to personal injury hazards.DANGER: Make sure the gas on which the boilerwill operate is the same type as that specified on theboiler rating plate.WARNING: Do not use this boiler if any part hasbeen under water. Immediately call a qualifiedservice technician to inspect the boiler and toreplace any part of the control system and any gascontrol which has been under water.WARNING: To minimize the possibility of improperoperation, serious personal injury, fire, or damage tothe boiler:• Always keep the area around the boiler free ofcombustible materials, gasoline, and otherflammable liquids and vapors.• Boiler should never be covered or have anyblockage to the flow of fresh air to the heater.WARNING - CALIFORNIA PROPOSITION65: This product contains chemicals known to theState of California to cause cancer, birth defects orother reproductive harm.WARNING: Risk of electrical shock. More than onedisconnect switch may be required to de-energizethe equipment before servicing.CAUTION: This boiler requires forced watercirculation when the burner is operating. Severedamage will occur if the boiler is operated withoutproper water flow circulation.CAUTION: If this boiler is to be installed aboveradiation level, it must be provided with a low watercut-off device at the time of boiler installation.CAUTION: If this boiler is to be installed in anegative or positive pressure equipment room, thereare special installation requirements. Consult factoryfor details.WARNINGSPay Attention to These TermsWARNING: Improper installation, adjustment,alteration, service or maintenance can causeproperty damage, personal injury, exposure tohazardous materials* or loss of life. Review theinformation in this manual carefully. *This unitcontains materials that have been identified ascarcinogenic, or possibly carcinogenic, to humans.WARNING: Should overheating occur or the gassupply fail to shut off, do not turn off or disconnectthe electrical supply to the pump. Instead, shut offthe gas supply at a location external to theappliance.AVERTISSEMENT: En cas de surchauffe ou sil’admission de gaz ne peut être coupée, ne pascouper ni débrancher l’alimentation électrique de lapompe. Fermer plutôt le robinet d’admission de gazà l’extérieur de l’appareil.NOTE: This manual should be maintained in legiblecondition and kept adjacent to the boiler or inanother safe place for future reference.