Nordyne FG7SA-054C-23A, FG7SK-108C-35C, FG7SC-038D-23A, FG7SK-090C-24B, FG7SL-072D-24B User Manual

GAS FURNACES Single Stage, Two-Stage, and Modulating Furnaces

*SK/*TK Downflow

95.1% AFUE Condensing Furnaces
*TC Upflow/Horizontal

97%+ AFUE Modulating Furnaces

*MQ Upflow/Horizontal

FiRE OR EXPLOSION HAZARD

=Failure to follow safety warnings e×actly

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.

_SL Downflow

*TL Downfiow

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.

_'_92.1%, 95.1% and 97%+ AFUE Models Only

Congratulations on the purchase on your new furnace! With 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 of safe and dependable home comfort, providing it is properly
installed and regular maintenance has been performed. Improper use or insufficient maintenance can

shorten the life of the furnace and result in serious personal injury or property damage. Please read
this manual thoroughly and familiarize yourself with the safety, operation and maintenance procedures

for this furnace.

TABLE OF CONTENTS

SAFETY INFORMATION .............................. 4

Air for Proper Combustion ...................... 4

Clearances to Combustibles .................. 4

Flood Damage ....................................... 4

Filters ..................................................... 4

Gas Supply and Piping .......................... 5

Inspection ............................................... 5

Venting System ...................................... 5

Shutting Down the Furnace ................... 5

COMPONENT INFORMATION ..................... 6

Venting System ...................................... 6

Category I Furnaces ......................... 6

Category IV Furnaces ...................... 6

Thermostats ........................................... 6

COMBUSTION AIR REQUIREMENTS ......... 6

Sources of Corrosion ............................. 6

Furnace in Small Room or Closet .......... 6

INSPECTION ................................................. 7

Frequency .............................................. 7

Venting System ...................................... 7

Blower and Filter ................................... 7

Air for Combustion ................................. 7

Air for Comfort ........................................ 7

Maintenance Table ................................ 8

Burner Operation .................................. 8

New Construction .................................. 8

Furnace and Air Ducts ........................... 8

TROUBLESHOOTING .................................. 8

LOCATION OF SINGLE-STAGE FURNACE

COMPONENTS ............................................. 9

LOCATION OF TWO-STAGE FURNACE

COMPONENTS ........................................... 10

LOCATION OF MODULATING FURNACE

COMPONENTS ........................................... 11

STARTUP AND SHUTDOWN ....................... 7

Starting the Furnace .............................. 7

Shutting Down the Furnace ................... 7

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.

CLEARANCES TO COMBUSTIBLES
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.

WARNING:

The safety information listed below 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 personal
injury, or death.

WARNING:

PROPOSITION 65 WARNING: This product contains

chemicals known to the state of California to cause
cancer, birth defects or other reproductive harm.

WARNING:

This furnace is not approved for installation in

mobile homes. Installing this furnace in a mobile
home could cause fire, property damage, and/or

personal injury.

AIR FOR PROPER COMBUSTION
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.

WARNING:

Do not place combustible materials on or against

the furnace cabinet or within 6 inches ofthe vent

pipe. Furnace area 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.

FLOOD DAMAGE

WARNING:

Do not use this furnace if any part has been under

water. A flood damaged furnace is extremely

dangerous. Attempts to use the furnace can
result in fire or explosion. A qualified service

agency should be contacted to inspect the

furnace and to replace all gas controls, control

system parts, electrical parts that have been

wet or the furnace if deemed necessary.

FILTERS

WARNING:

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.

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.

Air filter(s) are not supplied with the furnace as
shipped from the factory. The installer must provide

a high velocity filter and rack for a filter in the return air
duct adjacent to the furnace, or in a return air grill to

the furnace.
The furnace should always have a clean filter located

either at the air return on the furnace or in an air return
register in your habitable space. If the filter becomes

dirty, it should be cleaned or replaced.