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TABLE OF CONTENTS

SAFETY CONSIDERATIONS .....................................................1

INTRODUCTION ..........................................................................1

CODES AND STANDARDS........................................................3

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........3

LOCATION....................................................................................4

General ......................................................................................4
Location Relative to Cooling Equipment ................................4
Hazardous Locations.................................................................4
Unconfined Space .....................................................................4
Confined Space .........................................................................5

AIR DUCTS...................................................................................5

General Requirements...............................................................5
Ductwork Acoustical Treatment...............................................5
Supply Air Connections............................................................5
Return Air Connections ............................................................6
Downflow Installation ..............................................................6
Horizontal Attic Installation .....................................................6
Horizontal Crawlspace Installation ..........................................7
Filter Arrangement....................................................................8
Gas Piping.................................................................................9
Electrical Connections ............................................................11
Venting ....................................................................................11

START-UP PROCEDURES, ADJUSTEMENT, AND SAFETY
CHECK.........................................................................................11

General ....................................................................................11
Sequence of Operation............................................................12
Start-Up Procedures ................................................................15
Adjustments.............................................................................15
Check Safety Controls ............................................................19
Checklist..................................................................................20

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person-
nel 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.

In the United States, follow all safety codes including the National
Fuel Gas Code (NFGC) NFPA 54-1999/ANSI Z223.1-1999 and
the Installation Standards, Warm Air Heating and Air Condition-
ing Systems (NFPA 90B) ANSI/NFPA 90B.

In Canada, refer to the current edition of the CAN/CGA-B149.1-
and .2-M99 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 furnace and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words; DANGER, WARNING, and
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 a
hazard 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
These instructions cover 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 pace with changing
residential construction practices. We require these instructions as
a minimum for a safe installation.

INTRODUCTION

The Model 376CAV, Series H and J Furnace is available in sizes
46,000 through 135,000 Btuh input capacities.
The design of the downflow/horizontal gas-fired furnace is
(A.G.A. & C.S.A.) certified for natural and propane gases and for
installation on noncombustible flooring. The furnace is factory-
shipped for use with natural gas. A factory accessory gas conver-
sion kit, as listed on the furnace rating plate is required to convert
furnace for use with propane gas.
These furnaces SHALL NOT be installed directly on carpeting,
tile, or any combustible material other than wood flooring. In
downflow installations, a factory accessory floor base, as listed on
the furnace rating plate, MUST be used when installed on
combustible materials and wood flooring. A factory 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. This furnace is for installation in alcoves, attics,
crawlspaces, basements, closets, or utility rooms. The design of
this furnace line is not (A.G.A./C.S.A.) certified for installation in
mobile homes, recreation vehicles, or outdoors.