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GAS FURNACES
USER'S MANUAL
HIGH EFFICIENCY - SINGLE STAGE CONDENSING FURNACES
M4RC Upflow Models
IMPORTANT! Please read all information in this manual thoroughly and become familiar with the capabilities and use of your
appliance before attempting to operate or maintain this unit. Pay attention to all safety warnings and any other special notes
highlighted in the manual. Safety markings are used frequently throughout this manual to designate a degree or level of seriousness
and should not be ignored.
Keep this literature where you have easy access to it in the future. If a problem occurs, check the instructions and follow
recommendations given. If these suggestions don't eliminate your problem, call your servicing contractor. Under no circumstances
should the appliance owner attempt to install and/or service this equipment.
Some local codes require licensed installation / service personnel for this type of equipment. Improper service, adjustment, or
maintenance may cause explosion, fire, electrical shock or other hazardous conditions which may result in personal injury or
property damage.
• Failure to follow safety warnings exactly could result in serious injury or property damage.
• Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
WARNING
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
92.1% AFUE
M4RL Downflow Models
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Table of Contents
Related Manuals for Nortek M4RC
Summary of Contents for Nortek M4RC
- Page 1 92.1% AFUE USER’S MANUAL HIGH EFFICIENCY - SINGLE STAGE CONDENSING FURNACES M4RC Upflow Models M4RL Downflow Models IMPORTANT! Please read all information in this manual thoroughly and become familiar with the capabilities and use of your appliance before attempting to operate or maintain this unit. Pay attention to all safety warnings and any other special notes highlighted in the manual.
- Page 2 IMPORTANT SAFETY INFORMATION .......3 GAS SUPPLY & PIPING ..........3 VENTING SYSTEM ..........3 FILTER ..............4 CLEARANCES TO COMBUSTIBLES ......4 SOURCES OF CORROSION ........4 FLOOD DAMAGE .............4 ABOUT THE FURNACE ..........5 INTRODUCTION ............5 CATEGORY IV (CONDENSING) FURNACES ..5 FILTER ..............5 FURNACE LOCATION ..........5 TROUBLESHOOTING ..........5 COMPONENT LOCATIONS ........6 STARTUP &...
- Page 3 IMPORTANT SAFETY INFORMATION Safety markings are used frequently throughout this manual to WARNING: designate a degree or level of seriousness and should not be ignored. WARNING indicates a potentially hazardous situation The furnace was shipped from the factory equipped that if not avoided, could result in personal injury or death. CAUTION indicates a potentially hazardous situation that if to operate on natural gas.
- Page 4 CLEARANCES TO COMBUSTIBLES WARNING: WARNING: It is imperative to maintain proper operation of the venting system, including the masonry chimney (if Do not place combustible materials on or against applicable). Insufficient venting could create the the furnace cabinet or within 6 inches of the vent production of excessive amounts of Carbon Monoxide pipe.
- Page 5 ABOUT THE FURNACE INTRODUCTION FILTER Congratulations on the purchase on your new furnace! With WARNING: our dedication to quality, superior reliability, and outstanding warranty, we know you will be pleased with this new appliance. This furnace has been designed and built to provide many years Never operate the furnace without a filter in place.
- Page 6 COMPONENT LOCATIONS Finish Flange Igniter Flame Roll-Out Burner Sensor Switch Assembly Gas Manifold Control Board Gas Valve Main Air Limit Switch Vent Limit Switch Pressure Switch - Condensate Inducer Assembly (‘B’, ‘C’, & ‘D’ cabinets only) Pressure Switch Transformer (Inducer) Blower Door Switch Blower...
- Page 7 STARTUP & SHUTDOWN MAINTENANCE & INSPECTION STARTING THE FURNACE FURNACE AIR DUCTS • The furnace should be inspected annually by a licensed HVAC Make sure the filter is clean and in place. technician. Table 1 (page 8) contains suggested inspections Make sure the vent system is properly installed.
- Page 8 Clean burner assembly. Clean condensate collection & disposal system (if applicable). Table 1. Maintenance Table Specifications & illustrations subject to change without notice or incurring obligations (04/18). O’Fallon, MO, © Nortek Global HVAC LLC 2018. 708875B All Rights Reserved. (Replaces 708875A)
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