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3

Gas Supply and Piping

This furnace does not have a pilot. It is equipped with an 
ignition device which automatically lights the burner. 

DO 

NOT

 try to light the burner by hand.

BEFORE OPERATING smell all around the furnace area 
for gas. Be sure to smell next to the fl oor because some 
gas is heavier than air and will settle to the fl oor.

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 fi re department.

Installation and service must be performed by 
a qualifi ed installer, service agency or the gas 
supplier.

 WARNING:

All gas piping and shutoff valves must be 
installed in compliance with local codes and 
utility regulations by licensed installers. DO 
NOT attempt to modify, or tap into existing 
gas lines yourself. Fire or explosion may result 
causing property damage, personal injury or 
loss of life. Failure to follow the safety warnings 
exactly could result in serious injury, death or 
property damage.

 WARNING:

The furnace was shipped from the factory 
equipped to operate on natural gas. Conversion 
to LP/propane gas must be performed by a 
licensed HVAC technician using a factory 
supplied conversion kit. Failure to use the 
proper conversion kit can cause fi re, explosion, 
property damage, carbon monoxide poisoning, 
personal injury, or death.

 WARNING:

The safety information listed throughout this 
manual must be followed during the installation, 
service, and operation of this furnace. Failure 
to follow safety recommendations could result 
in possible damage to the equipment, serious 
per

sonal injury, or death.

Safety markings are used frequently throughout this 

manual to designate a degree or level of seriousness and 
should not be ignored. 

WARNING

 indicates a potentially 

hazardous situation that if not avoided, could result in 
personal injury or death. 

CAUTION

 indicates a potentially 

hazardous situation that if not avoided, may result in minor 
or moderate injury or property damage.

Air for Proper Combustion

 WARNING:

Do not reduce the supply of fresh air to the 
furnace. This could create the production of 
excessive amounts of Carbon Monoxide - a 
colorless, odorless gas that is a deadly poison 
that could result in serious personal injury 
or death. Do not block any openings that are 
supplying fresh air to the room or closet the 
furnace is in. If your furnace obtains its air 
through a pipe to the outdoors, do not allow 
the inlet of the pipe to become blocked.

Flammable Vapors

 WARNING:

Do not place combustible materials on or against 
the furnace cabinet or within 6 inches of the 
vent pipe. Do not place combustible materials, 
including gasoline or any other fl ammable 
vapors and liquids, in the vicinity of the furnace. 
A fi re or explosion may result causing property 
damage, personal injury or loss of life. Failure to 
follow the safety warnings exactly could result 
in serious injury, death or property damage.

SAFETY INFORMATION

Summary of Contents for M4RC 92.1% AFUE Upflow

Page 1: ...ITION 65 WARNING This product contains chemicals known to the state of California to cause cancer birth defects or other reproductive harm Gas Furnaces USER MANUAL Congratulations on the purchase on y...

Page 2: ...Furnace 5 Furnaces Components 5 Venting System 5 Category IV Furnaces 5 Combustion Air Requirements 5 Sources of Corrosion 5 Furnace in Small Room or Closet 5 Startup and Shutdown 6 Starting the Furn...

Page 3: ...n propertydamage carbonmonoxidepoisoning personal injury or death WARNING The safety information listed throughout this manualmustbefollowedduringtheinstallation service and operation of this furnace...

Page 4: ...ng Down the Furnace Should you ever need to shut down your furnace for service or maintenance shut off the gas at the gas valve first by moving the switch to the OFF Position Figure 1 If your installa...

Page 5: ...ers has occurred and must be corrected immediately Only a licensed HVAC technician can reset this switch Here is a problem that should be avoided Sometimes a furnace is properly installed and located...

Page 6: ...y by a licensed HVAC technician Homeowners should perform frequent visual inspections Table 1 on page 9 contains suggested inspections and frequency of maintenance Venting System Existing vent pipes s...

Page 7: ...s If the furnace fails to operate check the following 1 Is the thermostat operating properly 2 Are the blower compartment door s in place 3 Has the circuit breaker tripped or the control board fuse bu...

Page 8: ...pecifications and illustrations subject to change without notice and without incurring obligations Printed in U S A 05 08 O Fallon MO 7088750 1 Blower Assembly 2 Blower Door Switch 3 Burner Assembly 4...

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