158MVBDeluxe 4---WayMultipoise Variable---CapacityCondensing Gas FurnaceService and Maintenance InstructionsFor Sizes 040-- 120, Series 100NOTE: Read the entire instruction manual before starting theinstallation.TABLE OF CONTENTSPAGESAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . . . . . .GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 2. .CARE AND MAINTENANCE 3. . . . . . . . . . . . . . . . . . . . . . . .Cleaning and/or Replacing Air Filter 3. . . . . . . . . . . . . . . . .Blower Motor and Wheel Maintenance 4. . . . . . . . . . . . . . .Cleaning Burners 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cleaning Heat Exchangers 6. . . . . . . . . . . . . . . . . . . . . . . . .Flushing Collector Box and Drainage System 7. . . . . . . . . .Servicing Hot Surface Igniter 8. . . . . . . . . . . . . . . . . . . . . . .Electrical Controls and Wiring 9. . . . . . . . . . . . . . . . . . . . . .Checking Heat Tape Operation (If Applicable) 10. . . . . . . .Winterizing 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WIRING DIAGRAMS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TROUBLESHOOTING 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .ELECTRICAL SHOCK, FIRE, OR EXPLOSIONHAZARDFailure to follow safety warnings exactly could result indangerous operation, personal injury, death, or propertydamage.Improper servicing could result in dangerous operation,serious injury, death, or property damage.-- Before servicing, disconnect all electrical power tofurnace.-- When servicing controls, label all wires prior todisconnecting. Reconnect wires correctly.-- Verify proper operation after servicing.! WARNINGELECTRICAL SHOCK, FIRE, OR EXPLOSIONHAZARDFailure to follow this warning could result in possibledamage to this equipment, serious personal injury, or death.The ability to properly perform maintenance on thisequipment requires certain expertise, mechanical skills,tools, and equipment. If you do not possess these, do notattempt to perform any maintenance on this equipmentother than those procedures recommended in the User’sManual.! WARNINGFIRE OR EXPLOSION HAZARDFailure to follow this warning could cause corrosion ofheat exchanger, fire, personal injury, or death.Never store anything on, near, or in contact with thefurnace, such as:1. Spray or aerosol cans, rags, brooms, dust mops,vacuum cleaners, or other cleaning tools.2. Soap powders, bleaches, waxes or other cleaningcompounds, plastic or plastic containers, gasoline,kerosene, cigarette lighter fluid, dry cleaning fluids, orother volatile fluids.3. Paint thinners and other painting compounds, paperbags, or other paper products.! WARNINGSAFETY CONSIDERATIONSRecognize safety information. This is the safety--alert symbol. When you see this symbol on the furnace and ininstructions or manuals, be alert to the potential for personalinjury.Understand the signal words DANGER, WARNING, andCAUTION. These words are used with the safety--alert symbol.DANGER identifies the most serious hazards which will result insevere personal injury or death. WARNING signifies a hazardwhich could result in personal injury or death. CAUTION is usedto identify unsafe practices which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhanced installation,reliability, or operation.