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4

•  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.

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

 below.

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!

En cas de température excessive, ou s’il est impossible de couper 

l’alimentation en gaz, fermer le robinet manuel d’alimentation en gaz du 

générateur d’air chaud avant de  couper l’alimentation électrique

VENTING SYSTEM

 WARNING:

CARBON-MONOXIDE POISONING HAZARD

Failure to folow instructions could result in severe 

personal injury or death due to carbon-monoxide 

poisoning if combustion products infiltrate into 

the building.
Check that all oepnings in the outsdie wall around 

the vent (and air intake) pipe(s) are sealed to prefent 

infiltration of combustion products into the building.
Check that furnace vent (and air intake) terminal(s) 

are not obstructed in any way during all seasons.

 AVERTISSEMENT :

RISQUE D’INTOXICATION AU MONOXYDE

DE CARBONE

Si ces directives ne sont pas suivies, cela peut entraîner 

des blessures graves ou une intoxication au monoxyde de 

carbone pouvant causer la mort, si des produits de combustion 

s’infiltrent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur 

extérieur autour du ou des tuyaux d’évent (et de la prise d’air) 

sont scellées de manière à empêcher l’infiltration de produits 

de combustion dans le bâtiment.
Veiller à ce que la ou les sorties de l’évent de l’appareil 

de chauffage (et la prise d’air) ne soient, en aucune façon, 

obstruées, quelle que soit la saison

 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.

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

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.

Summary of Contents for M7RL

Page 1: ...r 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...

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: ...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 prop...

Page 4: ...sdie wall around thevent andairintake pipe s aresealedtoprefent infiltrationofcombustionproductsintothebuilding Check that furnace vent and air intake terminal s are not obstructed in any way during a...

Page 5: ...with applicable local codes having jurisdiction Thermostat connections should be made according to the instructions supplied with the thermostat and the indoor equipment The thermostat should be mount...

Page 6: ...nt visual inspections 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 secured and seal...

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: ...rved 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 Limit Switch Inline Drain...

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