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GAS FURNACES

HIGH EFFICIENCY - SINGLE STAGE CONDENSING FURNACES

92.1% AFUE

USER’S MANUAL

 WARNING

FIRE OR EXPLOSION HAZARD

•  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.

WHAT TO DO IF YOU SMELL GAS

•  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.

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.

MG3P Upflow Models

MG3S Downflow Models

Summary of Contents for MG3P

Page 1: ...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...

Page 2: ...OD DAMAGE 4 ABOUT THE FURNACE 5 INTRODUCTION 5 CATEGORY IV CONDENSING FURNACES 5 FILTER 5 FURNACE LOCATION 5 TROUBLESHOOTING 5 COMPONENT LOCATIONS 6 STARTUP SHUTDOWN 7 STARTING THE FURNACE 7 SHUTTING...

Page 3: ...ou les sorties de l vent de l appareil de chauffage et la prise d air ne soient enaucunefa on obstru es quellequesoitlasaison Safety markings are used frequently throughout this manual to designate a...

Page 4: ...Never operate the furnace without a filter in place Accumulating dust in the return air can build up on internal components resulting in loss of efficiency equipment damage and possible fire Keep air...

Page 5: ...ace operation The homeowner must make sure the condensate drain lines do not become blocked pinched or crushed If the furnace is installed in an area where temperatures fall below freezing special pre...

Page 6: ...e B C D cabinets only Roll Out Switch Transformer Vent Limit Switch Burner Assembly Flame Sensor Roll Out Switch Finish Flange Blower Assembly behind blower panel Blower Door Switch behind blower pane...

Page 7: ...F YOU NEED TO SHUT DOWN YOUR FURNACE FOR SERVICE OR MAINTENANCE SHUT OFF THE GAS VALVE TO THE FURNACE BEFORE TURNING OFF THE ELECTRICAL SERVICE If your installation has a manual gas shutoff valve on t...

Page 8: ...the furnace The furnace venting system should be inspected annually by a licensed HVAC technician Vent pipe must slope upwards and be physically secured without holes or corrosion Any corroded sectio...

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