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 58MXA 040 through 120 size units are C.S.A. design-certified
for use in manufactured (mobile) homes when 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 manufac-
tured building completed at final site. The design of this furnace
line is NOT C.S.A. 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 85°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.
This furnace must be installed with a direct-vent (combustion air
and flue gas) system and a factory accessory termination kit. In a
direct-vent system, all air for combustion is taken directly from the
outdoor atmosphere and flue gases are discharged to the outside
atmosphere. See furnace and factory accessory vent-air intake
termination kit instructions for proper installation.
These furnaces are shipped with the following materials to assist in
proper furnace installation. These materials are shipped in the main
blower compartment.
Installer Packet includes:
Installation, Startup, and Operating Instructions
Service and Maintenance Instructions
User’s Information Manual
Warranty Certificate
Loose Parts Bag includes: Quantity
Pressure tube extension 1
Collector Box or condensate trap extension tube 1
Inducer housing drain tube 1
1/2-in CPVC street elbow 2
Drain tube coupling 1
Drain tube coupling grommet 1
Vent and combustion-air pipe support 2
Condensate trap hole filler plug 3
Vent and combustion-air intake hole filler plug 2
Combustion-air pipe perforated disk assembly 1
Vent Pipe Extension 1*
* ONLY supplied with some furnaces.
For accessory installation details, refer to accessory installation
instructions.
INTRODUCTION
The model 58MXA 4-way multipoise, Gas-Fired, Category IV,
direct-vent condensing furnace is available in model sizes ranging
in input capacities of 40,000 to 138,000 Btuh.
CODES AND STANDARDS
Follow all national and local codes and standards in addition to
these instructions. The installation must comply with regulations
of the serving gas supplier, local building, heating, plumbing, and
other codes. In absence of local codes, the installation must
comply with the national codes listed below and all authorities
having jurisdiction.
In the United States and Canada, follow all codes and standards for
the following:
Step 1—Safety
• US: National Fuel Gas Code (NFGC) NFPA 54-2002/ANSI
Z223.1-2002 and the Installation Standards, Warm Air Heating
and Air Conditioning Systems ANSI/NFPA 90B
• CANADA: National Standard of Canada, Natural Gas and
Propane Installation Code (NSCNGPIC) CAN/CGA -B149,1
-and.2 M-00
Step 2—General Installation
• US: NFGC and the NFPA 90B. For copies, contact the National
Fire Protection Association Inc., Batterymarch Park, Quincy,
MA 02269; or for only the NFGC contact the American Gas
Association, 400 N. Capitol, N.W., Washington DC 20001
• CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke (Tor-
onto), Ontario, M9W 1R3, Canada.
Step 3—Combustion and Ventilation Air
• US: Section 5.3 of the NFGC, Air for Combustion and
Ventilation
• CANADA: Part 7 of the NSCNGPIC, Venting Systems and Air
Supply for Appliances
Step 4—Duct Systems
• US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning Con-
tractors National Association (SMACNA), or American Soci-
ety of Heating, Refrigeration, and Air Conditioning Engineers
(ASHRAE) 2001 Fundamentals Handbook Chapter 34.
Step 5—Acoustical Lining and Fibrous Glass Duct
• US and CANADA: current edition of SMACNA, NFPA 90B as
tested by UL Standard 181 for Class I Rigid Air Ducts
Step 6—Gas Piping and Gas Pipe Pressure Testing
• US: NFGC; chapters 2, 3, 4, and 9 and national plumbing codes
In the state of Massachusetts:
• This product must be installed by a licensed plumber or gas
fitter.
• When flexible connectors are used, the maximum length shall
not exceed 36 inches.
• When lever type gas shutoffs are used they shall not exceed 36
inches.
• CANADA: NSCNGPIC Parts 3, 4, 5, A, B, E, and H.
Step 7—Electrical Connections
• US: National Electrical Code (NEC) ANSI/NFPA 70-2002
• CANADA: Canadian Electrical Code CSA C22.1
3
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