Carrier 58MCA Instruction Manual

WARNING: If the information in this manual
is not followed exactly, a fire or explosion may
result causing property damage, personal in-
jury or loss of life.
— Do not store or use gasoline or other flam-
mable 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.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
• 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.
®
HEATING & COOLING
MULTIPOISE, CONDENSING 58MCA, 58MVP, 58MXA
USER'S INFORMATION MANUAL FOR
THE OPERATION AND MAINTENANCE
OF YOUR NEW GAS-FIRED FURNACE
NOTE TO INSTALLER:
THIS MANUAL MUST BE LEFT WITH THE
EQUIPTMENT USER.
®
• • • • • • • • • • • • • • •
ULTRA HIGH EFFICIENCY
GAS FURNANCE
®

2
WELCOME TO A NEW GENERATION OF
COMFORT
Congratulations! In light of rising energy costs, theWeather-
Maker
 9200, 58MCA, and WeatherMaker Infinity, Mul-
tipoise, Gas-Fired Condensing Furnaces are among the
soundest investments today’s homeowner can make.
Your new furnace is truly a triumph of technology in home
heating. Arevolutionary design employs 2 heat exchangers
to “squeeze” out the maximum amount of heat from the fuel
consumed.Infact,yournewfurnaceissoefficient,over 90%*
of the heat generated during combustion is captured and
delivered inside your home. That is more than 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 depend-
able. We are proud of the technological advances incorpo-
rated 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 min-
utes with this manual to learn the operation of your new fur-
nace 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 Depart-
ment of Energy test procedures.
INSTALLATION DATA
Date Installed
Dealer Name
Address
City
State Zip
Telephone
FURNACE
Product No.
Model No.
Serial No.
SPLIT-SYSTEM
Product No.
Model No.
Serial No.
INDOOR COIL:
Product No.
Model No.
Serial No.
1
MODELS 58MXA (SHOWN) AND
58MCA FIXED-CAPACITY FURNACES
2
MODEL 58MVP
VARIABLE-CAPACITY FURNACE
®
• • • • • • • • • • • • • • •
ULTRA HIG H EFFICIE N C Y
GAS FURNANCE
®
®
• • • • • • • • • • • • • • •
ULTRA HIGH EFFICIENCY
GAS FURNANCE

3
FURNACE COMPONENTS
Combustion-air intake connection to ensure
contaminant-free air (right or left side).
Burner sight glass for viewing burner flame.
Burner assembly (inside). Operates with energy-
saving inshot burners and hot surface ignitor for safe,
dependable heating.
Redundant gas valve. Safe, efficient. Features 1 gas
control with 2 internal shut-off valves.
Vent outlet. Uses PVC pipe to carry vent gases from
the furnace’s combustion system (right or left side).
Inducer motor. Pulls hot flue gases through the heat
exchangers, maintaining negative pressure for added
safety.
Blower access panel safety interlock switch.
Air filter and retainer.
Condensate drain connection. Collects moisture
condensed from burned gases for disposal into home
drain system.
Heavy-duty blower. Circulates air across the heat
exchangers to transfer heat into the home.
Secondary condensing heat exchanger (inside).
Wrings out more heat through condensation.
Constructed with Polypropylene-laminated steel to
ensure durability.
Primary serpentine heat exchanger (inside).
Stretches fuel dollars with the S-shaped heat-flow
design. Solid construction of corrosion-resistant
aluminized steel means reliability.
Control center.
3-amp fuse provides electrical and component
protection.
Light emitting diode (LED) on control center. Code
lights are for diagnosing furnace operation and
service requirements.
Pressure switch(s) ensure adequate flow of flue
products through furnace and out vent system.
Rollout switch (manual reset) to prevent
overtemperature.
Junction box for 115-v electrical power supply.
Transformer (24v) behind control center provides
low-voltage power to furnace control center and
thermostat.
Limit switch (manual reset) on 58MVP only.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3
MODELS 58MXA AND 58MCA
FURNACES (UPFLOW POSITION)
4
MODEL 58MVP
FURNACE (UPFLOW POSITION)
8
10
5
16
9
6
11
5
4
18
217
3
12
7
1
14
15
13
19
810
5
15
14
13
16
9
11
5
217
3
4
12
18 6
20
1
7
19

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IMPORTANT FACTS
Your gas furnace uses air from outside the home for com-
bustion and venting. It is not to be installed using in-house
air. Therefore, both pipes must terminate outside the struc-
ture and must not be obstructed in any way.
5
To minimize the possibility of serious personal injury, fire,
damage to your furnace, or improper operation,
carefully
follow 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.
• Afurnaceinstalledinanatticorother 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.
6
NOTE: The qualified installer or agency must use only
factory-authorized replacement parts, kits, and accessories
when modifying this product.
This furnace contains SAFETY DEVICES which must be
MANUALLYRESET.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
section “Before You Request a Service Call” in this manual.
SAFETY CONSIDERATIONS
Installation and service of heating equipment can be hazard-
ous due to gas and electrical components. Only trained and
qualified personnel should install, repair, or service heating
equipment.
Untrained personnel can perform basic maintenance func-
tions such as cleaning and replacing air filters.All other oper-
ations must be performed by trained service personnel.
Observe safety precautions in this manual, on tags, and
labels attached to the furnace and other safety precautions
that may apply.
Recognize safety information. This is the safety-alert
symbol . When you see this symbol on the furnace and
in instructions or manuals, be alert to the potential for per-
sonal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety-alert sym-
bol.DANGER identifies the most serioushazardswhich will
result in severe personal injury or death. WARNING signi-
fies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices which would
result in minor personal injury or product and property
damage.
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 thermo-
stat turns on your furnace. Follow these important
safeguards:
7
• Never attempt to light the burners manually 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,
includingnearthe floor. If you smell gas, STOP!Follow “B”
in the safety information above on this label. If you don’t
smell gas, go to the next step.
!

5
• If a suspected malfunction occurs with your gas control
system, such as the burners not lighting when they should,
refer to the shutdown procedures on the furnace, or in the
section, “Shutting DownYour Furnace” and call your dealer
as soon as possible.
CHECKAIR FILTER: Before attempting to start your fur-
nace, be sure the furnace filter is clean and in place. See sec-
tion “Performing Routine Maintenance” 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.)
3. Turn off electrical supply to the furnace. (See Fig. 10.)
8 9
4. Remove the furnace access door. (See Fig. 11.)
5. Turn control knob on the gas valve to the OFF position
and wait 5 minutes. Then smell for gas, including near
the floor. If you smell gas,
STOP! Follow operating
instructions on furnace access door. (See Fig. 12.)
6. After waiting 5 minutes, turn control knob on the gas
valve to the ON position. (See Fig. 12.)
7. Replace furnace access door. (See Fig. 13.)
8. Turn on electrical supply to the furnace and wait
1 minute. (See Fig. 14.)
9. Open the external manual gas valve. (See Fig. 15.)
10. Set room thermostat to a temperature slightly above
room temperature. This will automatically signal the
furnace to start.
11. When the furnace receives the start signal, the hot sur-
face ignitor at the main burners is automatically heated
for 15 to 20 sec. When the microprocessor control ver-
ifies that there is sufficient heat to ignite, the gas valve
permits gas to flow to the main burners. After ignition
and a time delay of about 35 sec, your blower will start
at low speed until the control makes the necessary
adjustments to operate the blower at either the low- or
high-fire speed.
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 in-
jury or death.
!
SYSTEM
COOL OFF HEAT FAN
AUTO ON
50
70
90
50
70
90
C
L
O
S
E
10
11
12
NOTE: If the burners fail to ignite after 4 attempts, the fur-
nace control system will lockout. If lockout occurs, main
burners fail to light, or blower does not come on, shut down
the furnace and call your dealer for service.
13 14
15
12. Set your thermostat to the temperature that satisfies
your comfort requirements. SUGGESTION: Setting
the thermostat back a few degrees and compensating
for the difference with warmer clothing can make a big
difference in your fuel consumption on extremely cold
days. The few degrees at the top of your thermostat
“comfort level” are the most costly degrees to obtain.
FF
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