Carrier 58MCB, 58MVB, 58MTB User Manual

MULTIPOISE, CONDENSING
DIRECT VENT/NON-DIRECT VENT 58MCB, 58MTB, 58MVB, 58MXB

GAS FURNACE

USER’S INFORMATION MANUAL FOR OPERATION AND MAINTENANCE OF

YOUR GAS-FIRED FURNACE

NOTE TO INSTALLER:
THIS MANUAL MUST BE LEFT WITH THE
EQUIPMENT USER.

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WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
serious injury, death, or property damage.

— Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other
appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any
phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a neigh­bor’s phone. Follow the gas supplier’s instructions.

USER: Please read all instructions in
the manual and retain all manuals for
future reference.

• If you cannot reach your gas supplier, call the fire
department.

— Installation and service must be performed by a

qualified installer, service agency or the gas supplier.

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WARNING:

CARBON MONOXIDE POISONING HAZARD
Carbon Monoxide is invisible, odorless, and toxic!
Carrier Corporation recommends a carbon mon­oxide alarm in your home, even if you do not own
a gas appliance. Locate the carbon monoxide
alarm in the living area of your home and away
from gas appliances and doorways to attached
garages. Follow the alarm manufacturer’s instruc­tion included with the alarm.

Do not use this furnace if any part has been
under water. A flood-damaged furnace is
extremely dangerous. Attempts to use the
furnace can result in fire or explosion. A
qualified service agency should be contacted
to inspect the furnace and to replace all gas
controls, control system parts, electrical
parts that have been wet or the furnace if
deemed necessary.

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TABLE OF CONTENTS

WELCOME TO A NEW GENERATION OF COMFORT . . . . . . . 2

FURNACE COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

STARTING AND SHUTTING DOWN YOUR FURNACE . . . . . . . 5

Steps for Starting Your Furnace. . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Shutting Down Your Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

PERFORMING ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . 7

Filtering Out Trouble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

COMBUSTION AREA AND VENT SYSTEM . . . . . . . . . . . . . . . . . . . 9

Heading South for the Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

A CHECK-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

BEFORE YOU REQUEST A SERVICE CALL . . . . . . . . . . . . . . . . .11

INSTALLATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

WELCOME TO A NEW GENERATION
OF COMFORT

Congratulations! In light of rising energy costs, the 58MCB,
58MXB, 58MTB, and WeatherMaker Infinity, Multipoise, Gas­Fired Condensing Furnaces are among the soundest investments
today’s homeowner can make.

Your new furnace is truly a triumph of technology in home heat­ing. A revolutionary design employs 2 heat exchangers to
“squeeze” out the maximum amount of heat from the fuel con­sumed. In fact, your new furnace is so efficient, over 90%* of the
heat generated during combustion is captured and delivered inside
your home. That is more than a 33%* increase in heating effi-
ciency over conventional furnaces.

These are among the most energy-efficient furnaces you can buy to-
day. They also are among the safest and most dependable. We are
proud of the technological advances incorporated into the design of
these furnaces. With only minimal care, your new furnace will deliver
many years of money-saving home comfort and enjoyment. Spend
just a few minutes with this manual to learn the operation of your new
furnace and the small amount of maintenance it takes to help keep it
operating at peak efficiency year after year.

*The output capacity and any representations of efficiency for this furnace are based on standard
U.S. Department of Energy test procedures.

CERTIFIED

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As an ENERGY STAR®
partner, Carrier Corporation
has determined that this
product meets the ENERGY
STAR® guidelines for
energy efficiency.

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MODELS 58MXB (SHOWN)
AND 58MCB FIXED-CAPACITY
FURNACES

2

MODEL 58MVB
VARIABLE-CAPACITY
AND MODEL 58MTB
TWO-STAGE FURNACES

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FURNACE COMPONENTS

1

Combustion-air intake connection to ensure contami­nant-free air (right or left side).

2

Burner sight glass for viewing burner flame.

3

Burner assembly (inside). Operates with energy-saving
inshot burners and hot surface igniter for safe,
dependable heating.

4

Redundant gas valve. Safe and efficient. Features 1 gas
control with 2 internal shutoff valves. Valve appearance
varies with furnace model.

5

Vent outlet. Uses PVC pipe to carry flue gas from the fur­nace’s combustion system (right or left side).

6

Inducer motor. Pulls hot flue gases through the heat ex­changers, maintaining negative pressure for added safety.

7

Blower access panel safety interlock switch.

8

Air filter and retainer (location in furnace may vary).

9

Condensate drain connection. Collects moisture con­densed from burned gases for disposal into home drain
system. (Location in furnace varies.)

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need art

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Heavy-duty blower. Circulates air across the heat ex­changers to transfer heat into the home.

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Secondary condensing heat exchanger (inside). Wrings
out more heat through condensation. Constructed with
polypropylene-laminated steel to ensure durability.

12

Primary serpentine heat exchanger (inside). Stretches fuel
dollars with the S-shaped heat-flow design. Solid con­struction of corrosion-resistant aluminized steel means re­liability.

13

Furnace control board.

14

3-amp fuse provides electrical and component protection.

15

Light emitting diode (LED) on furnace control board.
Status code light is for diagnosing furnace operation and
service requirements.

16

Pressure switch(es) ensure adequate flow of flue gas
through furnace and out vent system.

17

Rollout switch (manual reset) to prevent overtemperature.

18

Junction box for 115-v electrical power supply. (May be
located on right or left side)

19

Transformer (24v) behind furnace control board pro­vides low-voltage power to furnace control board and
thermostat.

MODELS 58MCB, 58MXB, AND 58MTB
FURNACES (UPFLOW POSITION)

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5

11

16

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8

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19
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MODEL 58MVB
FURNACE (UPFLOW POSITION)

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SAFETY CONSIDERATIONS

Recognize safety information. This is the safety-alert sym-

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bol . When you see this symbol on the furnace and in
instructions or manuals, be alert to the potential for personal
injury.

Understand the signal words—DANGER, WARNING,
CAUTION and NOTE. DANGER, WARNING and
CAUTION are used with the safety-alert symbol. DANGER
identifies the most serious hazards which
personal injury or death. WARNING signifies hazards which

could result in personal injury or death. CAUTION is used

to identify unsafe practices which
sonal injury or product and property damage. NOTE is used
to highlight suggestions which
lation, reliability or operation.

To minimize the possibility of serious personal injury, fire,
furnace damage, or improper operation;

these safety rules:

• Your new gas furnace may have been installed in 1 of 2
ways, as a direct-vent (2-pipe) application or as a non-direct
vent (1-pipe) application.

• In a direct-vent (2-pipe) application, your furnace uses air
from outside the home for combustion and vents flue gas to
the outdoors. This type of application will have 2 pipes run­ning from the furnace to the outdoors. (See Fig. 5.) In this
application, the vent and air-intake pipes must terminate out­side the structure and must not be obstructed in any way. Do
not block or obstruct air openings on furnace or spaces
around furnace.

will result in enhanced instal-

will result in severe

may result in minor per-

carefully follow

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• Keep the area around your furnace clear and free of com­bustible materials, gasoline, and other flammable liquids and
vapors.

• In a non-direct vent (1-pipe) application, your furnace uses
air from adjacent to the furnace for combustion and vents flue
gas to the outdoors. This type of application will have only
1 pipe running from the furnace to the outdoors. (See Fig. 6)
The other pipe will terminate in the same space as the furnace
and is the source of combustion air for your furnace. There­fore, the furnace must not be enclosed in an airtight room or
be sealed behind solid doors. It must have adequate airflow
for efficient combustion and safe ventilation. Do not obstruct
the combustion-air pipe in any way. The vent pipe must ter­minate outside the structure and must not be obstructed in any
way. Do not block or obstruct air openings or space around
furnace.

• Do not cover the furnace, store trash or debris near it, or
in any way block the flow of fresh air to the unit.

In addition to the safety rules above, make sure that the fol­lowing combustion-air requirements are met for non-direct
vent applications.

• Combustion air must be clean and uncontaminated with
chlorine or fluorine. These compounds are present in many
products around the home, such as water softener salts, laun­dry bleaches, detergents, adhesives, paints, varnishes, paint
strippers, and plastics.

•

Make sure the combustion air for your furnace does not con­tain any of these compounds. During remodeling be sure the
combustion air is fresh and uncontaminated. If these compounds
are burned in your furnace, the heat exchangers may deteriorate.

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• A furnace installed in an attic or other insulated space must
be kept free and clear of insulating material. Examine the fur­nace area when the furnace is installed or when insulation is
added. Some materials may be combustible.

• Should the gas supply fail to shut off or if overheating
occurs, shut off the gas valve to the furnace before shutting
off electrical supply.

This furnace contains SAFETY DEVICES which must be
MANUALLY RESET. If the furnace is left unattended for
an extended period of time, have it checked periodically for
proper operation. This precaution will prevent problems
associated with no heat, such as frozen water pipes, etc. See
“Before You Request a Service Call’’ section in this manual.

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