User’s
Information Manual
®
Series 3
Models 550 and 750 MBH
Commercial Condensing
Gas-fired water boilers
If the information in this manual is not followed exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS —
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any telephone in your building.
• Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation & service must be performed by a qualified installer, service technician or the gas supplier.
Part number 550-100-560/0321
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