Carrier 58MXA, 58MTA, 58MCA, 58MVP User Manual

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%* of the
heat generated during combustion is captured and delivered inside
your home. That is more that a 33%* 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
Department of Energy test procedures.

INSTALLATION DATA

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• • • • •

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ICIENCY

GH EFF

A HI

TR

UL

GAS FURNANCE

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

1

Date Installed

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.

Serial No.

2

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

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
pilot, inshot burners, and hot surface igniter for safe,
dependable heating.

4

Redundant gas valve. Safe, efficient. Features 1 gas con­trol with 2 internal shutoff valves.

5

Vent outlet. Uses PVC pipe to carry vent gases from the
furnaces 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.

11
16

10

2

17

3

1

4

12

18

5

5

14

6

9

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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

Control center.

14

3-amp fuse provides electrical and component protection.

15

Light emitting diode (LED) on control center. Code lights
are for diagnosing furnace operation and service require­ments.

16

Pressure switch(es) ensure adequate flow of flue products
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
on right or left side)

19

Transformer (24v) behind control center provides low­voltage power to furnace control center and thermostat.

20

Limit switch (manual reset) on 58MVP only.

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

MODEL 58MVP
FURNACE (UPFLOW POSITION)

3

4

IMPORTANT FACTS

Your gas furnace uses air from outside the home for combus­tion and venting. It is not to be installed using in-house air.
Therefore, both pipes must terminate outside the structure
and must not be obstructed in any way.

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

these safety rules:

• 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.

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

NOTE:

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 any gas control which has been under water.

carefully follow

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.

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazard­ous due to gas and electrical components. Only trained and
qualified personnel 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. Observe safety precautions in this manual, on tags, and
on labels attached to the furnace, and other safety precautions
that may apply.

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

5

will result in enhanced installation, reliability or operation.

could result in personal injury or

STARTING 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:

NOTE:

The qualified installer or agency must use only
factory-authorized replacement parts, kits, and accessories
when modifying this product.

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

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

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

6

refer to the shutdown procedures on the furnace, or in the
“Shutting Down Your Furnace” section and call your dealer
as soon as possible.

4

STOP! Follow “B’’

7

•

!

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

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

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

1

M

O

O

F

F

F

F

3

P

2

C

ON

OR

OFF

ON

12

5. The gas valve will have EITHER a control knob or con­trol switch to turn off and on. Turn the control knob or
switch on the gas valve to the OFF position and wait
5 minutes. (See Fig. 12 or 13.)

6. After waiting 5 minutes, turn the control knob or switch
on the gas valve to the ON position. (See Fig. 14 or 15.)

F

O

F

®

C

L

O

S

E

910

3. Turn OFF electrical supply to the furnace. (See Fig. 10.)

4. Remove control access door. (See Fig. 11.)

13

8

1

M

O

O

F

F

F

F

3

P

2

C

ON

OR

OFF

ON

14

ON

11

15

5