Carrier 58MCA User Manual

MULTIPOISE, CONDENSING 58MCA, 58MTA, 58MVP, 58MXA

GAS FURNACE

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

!

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 manuals and
retain manuals for future reference.

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ULTRA HIGH EFFICIENCY

GAS FURNANCE

• 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.

!

WARNING:

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.

A93007

Do not use this furnace if any part has been
under water. Immediately call a qualified
service technician to inspect the furnace and
to replace any part of the control system and
gas control which has been under water.

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ULTRA

HIG

H E

FFIC

IENCY

GAS FURNANCE

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WELCOME TO A NEW GENERATION
OF COMFORT

Congratulations! In light of rising energy costs, the 58MXA,
58MCA, 58MTA, 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% AFUE*
of the heat generated during combustion is captured and delivered
inside your home. That is more that a 33% AFUE* increase in
heating efficiency over conventional furnaces.

These are among the most energy-efficient furnaces you can buy to­day. 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.

INSTALLATION DATA

Date Installed

CERTIFIED

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

1

MODELS 58MXA (SHOWN) AND
58MCA FIXED-CAPACITY FURNACES

Dealer Name

Address

City

State Zip

Telephone

FURNACE

Product No.

Model No.

Serial No.

SPLIT-SYSTEM

OUTDOOR UNIT:

Product No.

Model No.

Serial No.

INDOOR COIL:

Product No.

Model No.

2

MODEL 58MVP
VARIABLE-CAPACITY
AND MODEL 58MTA
TWO-STAGE FURNACES

Serial No.

2

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 ignitor for safe,
dependable heating.

4

Redundant gas valve. Safe, 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.

9

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

11
16

10

2

17
3

1

4

12

18

5

5

14

6
9

need art

15

13
7

19

8

10

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

11

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.
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 58MXA, 58MCA, AND 58MTA
FURNACES (UPFLOW POSITION)

2

12

1

5

11

16

9
8

3

17
3

4

18

6

5

15
14

13
7

19
10

20

20

Limit switch (manual reset) on 58MVP only.

4
MODEL 58MVP
FURNACE (UPFLOW POSITION)

3

SAFETY CONSIDERATIONS

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

!

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, and
CAUTION. 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
death. CAUTION is used to identify unsafe practices which

would result in minor personal injury or product and prop-

erty damage. NOTE is used to highlight suggestions which

will result in enhanced installation, reliability or operation.

could result in personal injury or

• 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.

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.

STARTING AND SHUTTING DOWN
YOUR FURNACE

Instead of a continuously burning pilot flame which wastes
valuable energy, your furnace uses an automatic, hot surface
ignition system to light the burners each time the thermostat
starts your furnace.

Follow these important safeguards:

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

these safety rules:

• Your gas furnace uses air from outside the home for com­bustion and venting. It is not to be installed using indoor air
for combustion. Both pipes must terminate outside the struc­ture and must not be obstructed in any way. Do not block or
obstruct the furnace opening or area around the furnace.

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

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

carefully follow

• Never attempt to manually light the burners with a match
or other source of flame.

• Read and follow the operating instructions on inside of
main furnace door, especially the item that reads as follows:

Wait 5 minutes to clear out any gas. Then smell for gas,

5

including near the floor. If you smell gas,
in the safety information above on this furnace label. If you
don’t smell gas, go to the next step.

• If a suspected malfunction occurs with your gas control
system, such as the burners do not light when they should,
refer to the shutdown procedures on inside of main furnace
door, or in the “Shutting Down Your Furnace” section and
call your dealer as soon as possible.

!

WARNING

If overheating occurs or the gas valve fails to shut
off the gas supply, turn off the manual gas valve to
the furnace BEFORE turning off the electrical sup­ply. (See Fig. 9.) Failure to follow this warning
could result in a fire or explosion, and personal in­jury or death.

•

CHECK AIR FILTER: Before attempting to start your

furnace, be sure the furnace filter is clean and in place. See
“Performing Routine Maintenance” section in this manual.

Then proceed as follows:

STEPS FOR STARTING YOUR FURNACE

6

1. Set your room thermostat to the lowest temperature set­ting. (See Fig. 8.)

2. Close the external manual gas valve. (See Fig. 9.)

STOP! Follow “B’’

7

4