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SAFETY CONSIDERATIONS
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.
Follow all safety codes. In the United States, follow all safety codes including the National Fuel Gas Code (NFGC) NFPA No. 54-1999/ANSI
Z223.1-1999 and the Installation Standards, Warm Air Heating and Air Conditioning Systems (NFPA 90B) ANSI/NFPA 90B. In Canada, refer
to the current edition of the CAN/CGA-B149.1- and .2-M00 National Standard of Canada, Natural Gas and Propane Installation Codes
(NSCNGPIC). Wear safety glasses and work gloves. Have a fire extinguisher available during start-up and adjustment procedures and service calls.
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, CAUTION, and NOTE. 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 would 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.
INTRODUCTION
The 355MAV Multipoise Condensing Gas-Fired furnaces are CSA (A.G.A. and C.G.A.) certified for natural and propane gases and for installation
in alcoves, attics, basements, closets, utility rooms, crawlspaces, and garages. The furnace is factory-shipped for use with natural gas. A
manufacturer’s accessory gas conversion kit is required to convert furnace for use with propane gas.
These furnaces shall not be installed directly on carpeting, tile, or any other combustible material other than wood flooring. For downflow
installations, a 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 the manufacturer’s coil assembly Part No. CD5 or CK5, or when Coil Box Part No. KCAKC is used. The design
of this furnace is not CSA (A.G.A. and C.G.A.) certified for installation in mobile homes, recreational vehicles, or outdoors. These furnaces are
suitable for installation in a structure built on site or a manufactured residence completed at final site.
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) applications as shown in Fig. 1. See details
in Applications section.
These furnaces are shipped with the following materials to assist in proper furnace installation. These materials are shipped in the main blower
compartment.
This furnace must be installed with a direct-vent (combustion air and flue) system and a factory accessory termination kit. In a direct-vent system,
all air for combustion is taken directly from the outside atmosphere and all flue products are discharged to the outside atmosphere. See furnace
and factory accessory termination kit instructions for proper installation.
CAUTION: 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. Improper installation or misapplication of furnace can require
excessive servicing or cause premature component failure.
WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide
poisoning, 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. Failure to follow this warning could result in electrical shock, fire, personal injury, or death.
CODES AND STANDARDS
Before installing the furnace in the United States, refer to the current edition of the NFGC and the NFPA 90B. For copies of the NFGC and NFPA
90B, contact the National Fire Protetion Association Inc., Batterymarch Park, Quincy, MA 02269; or American Gas Association, 1515 Wilson
Boulevard, Arlington, VA 22209.
Fig. 1—Multipoise Orientations
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
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