3
Downflow/horizontal furnace components
Manual Reset Auxiliary Limit Switch
Blower and Blower Motor
Relief Box
Rating Plate
Gas Valve Control Knob (On/Off)
2-Stage Gas Valve
Gas Burner
Blower Door Safety Switch
Draft Safeguard Tube and Switch
Gas Manifold
Hot Surface Ignitor
Flame Sensor
Manual Reset Flame Rollout Switch (2)
Status LED Light
1
2
3
4
5
6
7
8
9
10
11
12
13
14
4
Important facts
Your furnace must have adequate airflow for efficient com-
bustion and safe ventilation. Do not enclose it in an airtight
room or “seal’’ it behind solid doors.
To minimize the possibility of serious personal injury, fire,
furnace damage, or improper operation,
carefully follow
these safety rules:
• Keep the area around your furnace free of combustible
materials, gasoline, and other flammable liquids and
vapors.
5
• Do not cover the furnace, store trash or debris near it, or
in any way block the flow of fresh air to the unit.
• Combustion air must be clean and uncontaminated with
chlorine or fluorine. These compounds are present in
many products around the home, such as: water softener
salts, laundry bleaches, detergents, adhesives, paints, var-
nishes, paint strippers, waxes, and plastics.
Make sure the combustion air for your furnace does not con-
tain any of these compounds. During remodeling be sure the
combustion air is fresh and uncontaminated. If air with
vapors of these compounds is burned in your furnace, the
heat exchangers and metal vent system may deteriorate.
• A furnace installed in an attic or other insulated space
must be kept free and clear of insulating material. Examine
the furnace area when installing the furnace or adding more
insulation. Some materials may be combustible.
NOTE:
Do not use this furnace if any part has been under
water. Immediately call a qualified service technician to
inspect the furnace and to replace any part of the control sys-
tem, electrical components and any gas control which has
been under water.
NOTE:
The qualified installer or agency must use only fac-
tory-authorized replacement parts, kits, and accessories
when servicing this product.
This furnace contains safety devices which must be manu-
ally reset. If the furnace is left unattended for an extended
period of time, have it checked periodically for proper oper-
ation. This precaution will prevent problems associated
with no heat, such as frozen water pipes, etc. See “Before
You Request a Service Call’’ section in this manual.
Safety considerations
Installing and servicing heating equipment can be hazard-
ous due to gas and electrical components. Only trained and
