SAFETY CONSIDERATIONS
CAUTION:
UNIT RELIABILITY HAZARD
Improper installation or misapplication of furnace may
require excessive servicing or cause premature compo-
nent failure.
Application of this furnace should be indoors with special
attention given to vent sizing and material, gas input rate,
air temperature rise, unit leveling, and unit sizing.
WARNING:
FIRE,
EXPLOSION,
ELECTRICAL
SHOCK AND CARBON MONOXIDE POISONING
HAZARD
Failure to follow this warning could result in electrical
shock, fire, personal injury, or death.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause carbon monoxide poison-
ing, explosion, fire, electrical shock, or other conditions
which may cause personal injury or property damage.
Consult a qualified installer, service agency, local gas
supplier, or your distributor or branch for information or
assistance. The qualified installer or agency must use
only factory-authorized and listed kits or accessories
when modifying this product.
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified
personnel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in literature, on tags, and
on labels attached to or shipped with unit and other safety
precautions that may apply.
These instructions cover the minimum requirements and conform
to existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residen-
tial construction practices. We require these instructions as a
minimum for a safe installation.
Wear safety glasses and work gloves. Have a fire extinguisher
available during start-up and adjustment procedures and service
calls.
CAUTION:
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing and gloves when
handling parts.
Recognize safety information. This is the safety-alert symbol
.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
The 350A Multipoise Condensing Gas-Fired Furnaces are CSA
(formerly AGA and CGA) design-certified for natural and propane
gases (see furnace rating plate) and for installation in alcoves,
attics, basements, closets, utility rooms, crawlspaces, and garages.
The furnace is factory-shipped for use with natural gas. A CSA
listed gas conversion kit is required to convert furnace for use with
propane gas.
See Fig. 3 for required clearances to combustibles.
Maintain a 1-in. clearance from combustible materials to supply air
ductwork for a distance of 36 inches horizontally from the furnace.
See NFPA 90B or local code for further requirements.
These furnaces SHALL NOT be installed directly on carpeting,
tile, or any other combustible material other than wood flooring. In
downflow installations, factory accessory floor base MUST be
used when installed on combustible materials and wood flooring.
Special base is not required when this furnace is installed on
manufacturer’s Coil Assembly Part No. CD5 or CK5, or when Coil
Box Part No. KCAKC is used.
The 350A 040 through 120 size units are CSA design-certified for
use in manufactured (mobile) homes when installed as a 2-pipe
(direct vent) furnace and a factory accessory conversion kit is used.
The 140 size unit is NOT design-certified for use in manufactured
(mobile) homes. These furnaces are suitable for installation in a
structure built on site or a manufactured building completed at
final site. The design of this furnace line is NOT CSA design-
certified for installation in recreation vehicles or outdoors.
This furnace is designed for continuous return-air minimum
temperature of 60°F db or intermittent operation down to 55°F db
such as when used with a night setback thermometer. Return-air
temperature must not exceed 80°F db. Failure to follow these
return air limits may affect reliability of heat exchangers, motors
and controls. (See Fig. 4.)
These furnaces are shipped with the drain and pressure tubes
connected for UPFLOW applications. Minor modifications are
required when used in DOWNFLOW, HORIZONTAL RIGHT, or
HORIZONTAL LEFT (supply-air discharge direction) applica-
tions as shown in Fig. 1. See details in Applications section.
Install this furnace only in a location and position as specified in
LOCATION and INSTALLATION sections of these instructions.
Always provide adequate combustion and ventilation air as speci-
fied in section Combustion Air and Vent Pipe Systems of these
instructions to the furnace.
Combustion products must be discharged outdoors. Connect this
furnace to an approved vent system only, as specified in the
Combustion Air and Vent piping sections of these instructions.
Fig. 1—Multipoise Orientations
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
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