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4

CLeARANCeS TO COMBuSTIBLeS

 WARNING:

Do not place combustible materials on or against 

the  furnace  cabinet  or  vent  pipe.  The  area 

around the furnace must be kept clear and free 

of  combustible  materials,  gasoline  and  other 

flammable vapors and liquids. A 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.

The furnace is designed to have certain clearances to 

combustible items such as wood, paper, etc. Some types 

of insulation are combustible. If your furnace is installed 

in an attic, near unfinished walls, or in other insulated 

space, keep area surrounding the furnace free of insulating 

material. See 

Figure 1

, (page 

4)

 below.

This furnace does not have a pilot. It is equipped with an 

ignition device which automatically lights the burner. 

DO 

NOT

 light the burner by hand.

IMPORTANT NOTE:

Should the gas supply fail to shut off or if overheating 

occurs, shut off the gas valve to the furnace before 

shutting off the electrical supply!

VeNTING SYSTeM

 WARNING:

It is extremely important that the furnace receives 

an unobstructed flow of clean, fresh air to properly 

burn the fuel gas. If this flow of air is restricted, 

the partially burned combustion gases may create 

dangerous  amounts  of  carbon  monoxide  -  a 

colorless, odorless gas that is a deadly poison 

that can cause personal injury or death. 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. 

Your  furnace  obtains  its  air  through  a  pipe  to 

the outdoors, do not allow the inlet of the pipe 

to become blocked.

•  For  proper  and  safe  operation,  this  furnace  requires 

unrestricted airflow for combustion and ventilation. 

Do not block or obstruct air openings on the furnace, 

air openings around the furnace area or the spacings 

around the furnace.

•  Air  openings  on  the  top  or  front  of  the  furnace  and 

openings in closet doors or walls must never be 

restricted. If the furnace is operated without adequate 

air for combustion, the flame roll-out switch will open, 

turning off the gas supply to the burners. This indicates 

that a serious problem with the burners has occurred 

and must be corrected immediately. Only a licensed 

HVAC technician can reset this switch.

•  Your furnace and its venting system should be inspected 

annually by a licensed HVAC technician. The filter 

should be inspected at least once a month. See the 

Maintenance Information on 

page 6

.

•  Before you remodel a room near the furnace, consult 

with a local code official or the National Fuel Gas Code 

to make sure you will be in compliance with supplying 

adequate air for combustion. By erecting new walls, 

it is sometimes possible to inadvertently restrict the 

furnace’s air supply. You can find more information 

about supplying combustion air in the NFGC, which is 
available at many libraries.

SHuTTING DOWN THe fuRNACe

If you need to shut down your furnace for service or 

maintenance, shut off the gas valve to the furnace before 

shutting off the electrical service. Remove the door panel 

from the front of the furnace and turn the gas valve OFF. 

See 

Figure  2,  (page 

7)

. Additional instructions for 

shutting down the furnace can be found on 

page  7

If your installation has a manual gas shutoff valve on the 

gas supply pipe, shut this off, then shut off the electric 

to the furnace.

IMPORTANT SAfeTY INfORMATION

Figure 1. Minimum Clearances

CLeARANCeS TO COMBuSTIBLe MATeRIALS*

LEFT

SIDE

FRONT

RIGHT

SIDE

REAR

RIGHT

SIDE

MODELS WITH FRONT AIR RETURN

MODELS WITH TOP AIR RETURN

REAR

LEFT

SIDE

FRONT

VENT

VENT

Sides....................... 0 Inches

Front ........................1 Inch

Top ..........................6 Inches

Rear ........................ 0 Inches

Vent ........................ 0 Inches

Summary of Contents for M7RL Series

Page 1: ...ious 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...

Page 2: ...INFORMATION 5 About the Furnace 5 Air FILTERS 5 THERMOSTAT 5 FURNACE IN A SMALL ROOM OR CLOSET 5 SOURCES OF CORROSION 5 Warranty Information 5 MAINTENANCE INFORMATION 6 BLOWER FILTER 6 Condensate Drai...

Page 3: ...operational procedures WARNING PROPOSITION 65 WARNING This product contains chemicals known to the state of California to cause cancer birth defects or other reproductive harm To achieve optimum perfo...

Page 4: ...ration this furnace requires unrestricted airflow for combustion and ventilation Do not block or obstruct air openings on the furnace air openings around the furnace area or the spacings around the fu...

Page 5: ...ith applicable local codes having jurisdiction Thermostat connectionsshouldbemadeaccordingtotheinstructions supplied with the thermostat and the indoor equipment The thermostat should be mounted about...

Page 6: ...formfrequentvisualinspections of the furnace for obvious signs of deterioration The furnace should be sound without sagging cracks gaps etc around the base The return air duct connection s is secureda...

Page 7: ...valve outside the furnace 3 Turn electric to the furnace off 4 Open the door to the burner compartment 5 Set the gas valve ON OFF knob switch to the OFF position See Figure 2 for gas valve type and kn...

Page 8: ...LLC 2016 All Rights Reserved FURNACE COMPONENTS Figure 3 M7RL M7TL Furnace Components Blower Assembly Inducer Assembly Single Stage Gas Valve Gas Manifold Burner Assembly ON OFF Switch Control Board L...

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