440 03 4411 01 March. 2012 PARTS MANUAL Gas Furnace N9MSB DANGER, WARNING, CAUTION, and NOTE The signal words DANGER, WARNING, CAUTION, and NOTE are used to identify levels of hazard seriousness. The signal word DANGER is only used on product labels to signify an immediate hazard. The signal words WARNING, CAUTION, and NOTE will be used on product labels and throughout this manual and other manuals that may apply to the product. DANGER − Immediate hazards which will result in severe personal injury or death. WARNING − Hazards or unsafe practices which could result in severe personal injury or death. CAUTION − Hazards or unsafe practices which may result in minor personal injury or product or property damage. NOTE − Used to highlight suggestions which will result in enhanced installation, reliability, or operation. Signal Words in Manuals The signal word WARNING is used throughout this manual in the following manner: The signal word CAUTION is used throughout this manual in the following manner: Signal Words on Product Labeling Signal words are used in combination with colors and/or pictures on product labels. WARNING Safety Labeling and Signal Words ! ! CAUTION WARNING TABLE OF CONTENTS Model Number Identification 2 ..................... Parts Diagram 3 ................................. Parts 9 ......................................... MODELS N9MSB0401410A1 N9MSB0601410A1 N9MSB0601714A1 N9MSB0801716A1 N9MSB0802120A1 N9MSB1002114A1 N9MSB1002120A1 N9MSB1202420A1 ! WARNING ELECTRICAL SHOCK HAZARD Failure to turn off electric power could result in personal injury or death. Before installing or servicing system, turn off main power to the system. There may be more than one disconnect switch, including accessory heat- er(s).
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440 03 4411 01 March. 2012
PARTS MANUALGas Furnace
N9MSB
DANGER, WARNING, CAUTION, andNOTEThe signal words DANGER, WARNING, CAUTION,and NOTE are used to identify levels of hazardseriousness. The signal word DANGER is only used onproduct labels to signify an immediate hazard. Thesignal words WARNING, CAUTION, and NOTE will beused on product labels and throughout this manual andother manuals that may apply to the product.
DANGER − Immediate hazards which will result insevere personal injury or death.
WARNING − Hazards or unsafe practices which couldresult in severe personal injury or death.
CAUTION − Hazards or unsafe practices which mayresult in minor personal injury or product or propertydamage.
NOTE − Used to highlight suggestions which will resultin enhanced installation, reliability, or operation.
Signal Words in Manuals
The signal word WARNING is used throughout thismanual in the following manner:
The signal word CAUTION is used throughout thismanual in the following manner:
Signal Words on Product Labeling
Signal words are used in combination with colorsand/or pictures on product labels.