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58MCB
4-WAY MULTIPOISE FIXED-CAPACITY
CONDENSING GAS FURNACE
Input Rates: 40,000 thru 138,000 Btuh
Product Data
High Efficiency and
Flexibility Designed to Meet
the Needs of New Homes
The model 58MCB combines high
efficiency with flexibility to meet the
changing needs of new home
construction. The unique 4-way,
multipoise design of the 58MCB allows
for installation in upflow, downflow,
horizontal left, and horizontal right
orientations, meaning it is perfect for a
variety of installation applications. With
the exception of the 140 size unit, all
sizes of the 58MCB can be installed in a
manufactured (mobile) home when the
optional kit is used and in installations
with elevations up to 10,000 ft (140
size unit limitation 7,000 ft). The
furnace is factory configured for upflow
application but can easily be made ready
for downflow or horizontal installation.
With the exception of the 140 size, all
sizes can be installed with 2-pipe or
1-pipe venting. The 140 size can be
installed only as a 2-pipe system.
Horizontal applications offer the ad-
vantage of reduced space requirements
by locating the furnace in an attic or
crawlspace, freeing space formerly ded-
icated to a furnace or utility room.
The 58MCB is specifically designed
to meet the needs of home builders and
new home owners. Home builders
benefit from the 58MCB's unmatched
flexibility and by building a reputation
of using quality appliances in homes.
Home owners benefit by energy savings
from one of the most important home
appliances.
The components of the 58MCB
represent the finest in the industry. Hot
surface ignition (HSI) and a control
center provide reliable and efficient
ignition. The combustion inducer is
unique in that efficient operation is

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Summarization of Contents

Product Data
High Efficiency and Flexibility
Describes the furnace's features and benefits for new homes.
58MCB Features and Benefits
Serpentuff™ Coating
Exclusive coating on the secondary heat exchanger for durability.
Power Heat™ Igniter
Robust and reliable SiN igniter operating at line voltage.
Control Center Functionality
Manages sequencing, diagnostics, and blower timing.
Furnace Warranties
Details the warranty coverage for heat exchangers and the unit.
Venting Flexibility
Options for direct/non-direct venting and pipe configurations.
Adjustable Blower Speed
Allows precise airflow selection for heating/cooling.
Casing Construction
One-piece, seamless wrap-around prepainted galvanized steel.
Combustion Products Venting Method
Termination through side wall or roof.
Insulation Features
Foil-faced insulation minimizes heat loss.
Certifications and Listings
CSA, GAMA, and California Air Quality certifications.
Quality Registration Standard
Manufactured under an ISO 9001 registered quality system.
Component Identification and Notes
Burner Sight Glass
Allows viewing of the burner flame.
Burner Assembly
Houses energy-saving burners and hot surface igniter.
Combustion-Air Intake Connection
Ensures contaminant-free air supply to the furnace.
Redundant Gas Valve
Provides safe and efficient gas control.
115-v Electrical Power Supply Junction Box
Connection point for electrical power.
Vent Outlet
Carries vent gases using sealed PVC pipe.
Secondary Condensing Heat Exchanger
Wrings out more heat via condensation.
Pressure Switch
Ensures adequate flue product flow.
Combustion Inducer
Pulls flue gases, maintains negative pressure.
Condensate Drain Connection
Collects moisture from the combustion process.
Heavy-Duty Blower
Circulates air across heat exchangers for heat transfer.
Air Filter and Retainer
Used for side or bottom return air application.
Rollout Switch
Prevents overtemperature in the burner area.
Primary Serpentine Heat Exchanger
S-shaped design for efficient heat flow.
3-Amp Fuse
Provides electrical and component protection.
Light Emitting Diode (LED)
Aids in diagnosing furnace operation and service.
Control Center
Manages sequencing and furnace operation.
Blower Access Panel Safety Interlock Switch
Safety switch for blower access panel.
Transformer (24v)
Provides low-voltage power for controls.
Thermostat and Zoning Control Options
Non-Programmable Thermostat Selection
Options for basic thermostat control and features.
Programmable Thermostat Selection
Options for advanced programmable thermostat control.
Zoning Control Systems
Systems for multi-zone temperature control.
Furnace Accessories and Components
Side Filter Rack
Custom rack for easy filter access and cleaning.
Concentric Vent Kit
Kit for single-exit vent and combustion-air termination.
Downflow Subbase
Base for installing furnace on combustible floors.
Carrier Cased N-Coil
Upflow/downflow furnace coil that can replace subbase.
Electronic Air Cleaner
Cleans air of smoke, dirt, and pollen.
Humidifier
Adds moisture to winter-dry air for improved comfort.
Thermostats and Zoning Controls
Devices for precise home temperature management.
Energy/Heat Recovery Ventilator
Exchanges indoor/outdoor air while minimizing heat loss.
Clearance to Combustibles
Minimum Clearances for All Positions
Required clearances for service and general installation.
Downflow Position Clearances
Specific clearances for downflow installations.
Horizontal Position Clearances
Clearances for horizontal installations and vent/air connections.
Typical Installation Applications
Basement Upflow Application
Diagram showing furnace installation in a basement.
Closet Downflow Application
Diagram showing furnace installation in a closet.
Typical Horizontal Installation Applications
Attic Horizontal Application
Diagram showing furnace installation in an attic.
Crawlspace Horizontal Application
Diagram showing furnace installation in a crawlspace.
Guide Specifications
General System Description
Overview of the furnace's purpose and capabilities.
Quality Assurance Standards
Compliance with industry standards and certifications.
Delivery, Storage, and Handling
Guidelines for receiving and managing the unit.
Warranty Information
Details on product warranty coverage.
Product Equipment Components
Key components included with the furnace.
Casing and Inducer Motor Construction
Specifications for the furnace casing and inducer motor.
Heat Exchanger Specifications
Details on primary and secondary heat exchanger design.
Control System Features
Micro-processor control board and diagnostic capabilities.
Operating Characteristics
Heating capacity, fuel gas efficiency, and air delivery specs.
Electrical Requirements
Voltage, frequency, phase, wire size, and fuse/breaker ratings.
Special Features and Enhancements
Additional features and available options.

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