Carrier Furnace 58MCA User Manual

MULTIPOISE, CONDENSING  
58MCA, 58MTA, 58MVP, 58MXA  
GAS FURNACE  
USER’S INFORMATION MANUAL FOR OPERATION AND MAINTENANCE OF  
YOUR GAS-FIRED FURNACE  
USER: Please read all instructions in  
the manual and retain all manuals for  
future reference.  
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 neigh-  
bor’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.  
Do not use this furnace if any part has been  
under water. A ood-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.  
!
WARNING:  
Carbon Monoxide is invisible, odorless, and toxic!  
Carrier Corporation recommends a carbon mon-  
oxide 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 instruc-  
tion included with the alarm.  
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FURNACE COMPONENTS  
1
Combustion-air intake connection to ensure contami-  
nant-free air (right or left side).  
17  
3
2
1
2
3
Burner sight glass for viewing burner flame.  
Burner assembly (inside). Operates with energy-saving  
inshot burners and hot surface igniter for safe,  
dependable heating.  
12  
18  
4
5
5
4
Redundant gas valve. Safe and efficient. Features 1 gas  
control with 2 internal shutoff valves. Valve appearance  
varies with furnace model.  
11  
16  
6
14  
5
6
Vent outlet. Uses PVC pipe to carry flue gas from the fur-  
nace’s combustion system (right or left side).  
15  
9
Inducer motor. Pulls hot flue gases through the heat ex-  
changers, maintaining negative pressure for added safety.  
13  
7
7
8
9
Blower access panel safety interlock switch.  
Air filter and retainer.  
10  
8
19  
Condensate drain connection. Collects moisture con-  
densed from burned gases for disposal into home drain  
system. (Location in furnace varies.)  
10  
11  
Heavy-duty blower. Circulates air across the heat ex-  
changers to transfer heat into the home.  
3
MODELS 58MXA, 58MCA, AND 58MTA  
FURNACES (UPFLOW POSITION)  
Secondary condensing heat exchanger (inside). Wrings  
out more heat through condensation. Constructed with  
polypropylene-laminated steel to ensure durability.  
17  
12  
Primary serpentine heat exchanger (inside). Stretches fuel  
dollars with the S-shaped heat-flow design. Solid con-  
struction of corrosion-resistant aluminized steel means re-  
liability.  
2
3
12  
1
4
6
13  
14  
15  
Furnace control board.  
18  
5
3-amp fuse provides electrical and component protection.  
5
Light emitting diode (LED) on furnace control board.  
Code light is for diagnosing furnace operation and service  
requirements.  
11  
15  
16  
Pressure switch(es) ensure adequate flow of flue gas  
through furnace and out vent system.  
14  
13  
17  
18  
Rollout switch (manual reset) to prevent overtemperature.  
7
19  
Junction box for 115-v electrical power supply. (May be  
located on right or left side)  
16  
9
8
10  
19  
Transformer (24v) behind furnace control board pro-  
vides low-voltage power to furnace control board and  
thermostat.  
4
MODEL 58MVP  
FURNACE (UPFLOW POSITION)  
3
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SAFETY CONSIDERATIONS  
• Do not cover the furnace, store trash or debris near it, or  
in any way block the flow of fresh air to the unit.  
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.  
• A furnace installed in an attic or other insulated space must  
be kept free and clear of insulating material. Examine the fur-  
nace area when the furnace is installed or when insulation is  
added. Some materials may be combustible.  
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 will result in severe  
personal injury or death. WARNING signifies hazards which  
could result in personal injury or death. CAUTION is used  
to identify unsafe practices which would result in minor per-  
sonal injury or product and property damage. NOTE is used  
to highlight suggestions which will result in enhanced instal-  
lation, reliability or operation.  
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.  
!
WARNING  
To minimize the possibility of serious personal injury, fire,  
furnace damage, or improper operation; carefully follow  
these safety rules:  
Fire Hazard! Failure to keep insulation clear of  
furnace could result in fire, personal injury/death  
or property damage.  
Your gas furnace uses air from outside the home for com-  
bustion and vents flue gas to the outdoors. It is not to be  
installed using indoor air for combustion. 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 the furnace.  
!
WARNING  
Do not keep combustible materials, gasoline, and  
other flammable liquids or vapors around your  
furnace. Failure to follow this warning could result  
in fire, personal injury/death or property damage.  
!
WARNING  
For proper and safe operation the furnace needs  
air for combustion and ventilation. Do not block  
or obstruct the openings on the furnace, air  
openings to the area in which the furnace is in-  
stalled, and the space around the furnace. Failure  
to follow this warning could result in fire, personal  
injury/death or property damage.  
BEFORE STARTING YOUR FURNACE  
Examine the furnace installation to determine that:  
1. All flue gas carrying areas external to the furnace  
(i.e. chimney, vent connector) are clear and free of  
obstructions.  
2. The vent connector is in place, slopes upward and is phys-  
ically sound without holes or excessive corrosion.  
5
• Keep the area around your furnace clear and free of com-  
bustible materials, gasoline, and other flammable liquids and  
vapors.  
3. The return-air duct connection(s) is physically sound, is  
sealed to the furnace casing, and terminates outside the  
space containing the furnace.  
4. The physical support of the furnace is sound without sag-  
ging cracks, gaps, etc. around the base.  
5. There are no obvious signs of deterioration of the furnace.  
6. The pilot and burner flames are in good adjustment (by  
comparison with pictorial sketches or drawings of the  
main burner flame and, if applicable, the pilot burner  
flame).  
6
4
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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:  
9
10  
3. Turn OFF electrical supply to the furnace. (See Fig. 10.)  
4. Remove main furnace door. (See Fig. 11.)  
7
• 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,  
including near the floor. If you smell gas, STOP! Follow “B’’  
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.  
11  
5. The gas valve will have a control switch to turn off and on.  
Turn the control switch on the gas control to the OFF  
position and wait 5 minutes. (See Fig. 12 or 13.) Then  
smell for gas, including near the floor. If you smell gas,  
STOP! Follow “B” on furnace label. If you don’t smell  
gas, go to next step.  
!
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 sup-  
ply. (See Fig. 9.) Failure to follow this warning  
could result in a fire or explosion, and personal in-  
jury/death or property damage.  
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 set-  
ting. (See Fig. 8.)  
For 58MTA and 58MVP  
12  
2. Close the external manual gas valve. (See Fig. 9.)  
or  
For 58MCA and 58MXA  
13  
®
8
5
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After the hot surface igniter is heated for 17 seconds, the  
gas valve permits gas to flow to the main burners. After  
ignition and a time delay of about 60 sec, the furnace  
blower will start. Variable-capacity furnaces start at low  
speed until the control makes the necessary adjustments  
to operate the blower at either the low- or high-heat speed.  
NOTE: If the burners fail to ignite after 4 attempts, the fur-  
nace control system will lock out. If lockout occurs, main  
burners fail to light, or blower does not come on, shut down  
the furnace and call your dealer for service.  
12. Set your thermostat to the temperature that satisfies  
your comfort requirements.  
For 58MTA and 58MVP  
14  
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. The few degrees at the top of your thermo-  
stat “comfort level’’ are the most costly degrees to obtain.  
or  
When the room temperature drops below the temperature  
selected on the thermostat, the furnace will switch on auto-  
matically. When the room temperature reaches the tempera-  
ture selected on the thermostat, the furnace will be switched  
off automatically.  
For 58MCA and 58MXA  
15  
Some thermostats have a FAN mode with 2 selections:AUTO  
and ON. When set on AUTO, the furnace blower cycles on  
and off. In the ON mode, the furnace blower runs continu-  
ously. Continuous fan keeps the temperature level in your  
home more evenly balanced. It also permits the indoor air to  
be continuously filtered. ComfortFan™ –On all but the  
58MCA, the blower speed can be increased or decreased if  
desired due to change of seasons, large gatherings in your  
home, etc. Simply change your FAN from ON to OFF for 1  
to 3 seconds (or AUTO depending on your thermostat), and  
then return to ON. The blower will switch to the next higher  
speed. There are at least 3 speeds to choose from. If the  
blower is running on its highest speed, a request to change  
will direct the blower to return to its lowest speed.  
6. After waiting 5 minutes, turn the control switch on the gas  
control to the ON position. (See Fig. 14 or 15.)  
SHUTTING DOWN YOUR FURNACE  
Should you ever need to shut down your furnace for service  
or maintenance, you will need to turn the furnace off. The  
following procedures must be followed:  
16  
1. Set your room thermostat to the lowest temperature  
setting. (See Fig. 19.)  
17  
18  
7. Replace main furnace door. (See Fig. 16.)  
®
8. Turn ON the electrical supply to the furnace and wait 1  
minute. (See Fig. 17.)  
19  
9. Open the external manual gas valve. (See Fig. 18.)  
2. Close the external manual gas valve (See Fig. 9.)  
10. Set the room thermostat to a temperature slightly  
above the room temperature. This will automatically  
signal the furnace to start.  
3. Turn off electrical supply to the furnace. (See Fig. 20.)  
4. Remove main furnace door. (See Fig. 11.)  
11. When the furnace receives the start signal, the inducer is  
started. When the pressure switch senses that there is suf-  
ficient combustion air, the hot surface igniter is energized.  
5. Turn the switch on the gas control to the OFF position.  
(See Fig. 21 or 22.)  
6
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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 and qual-  
ified service agency personnel. Observe safety precautions in  
this manual, on tags, and on labels attached to the furnace,  
and other safety precautions that may apply.  
With proper maintenance and care, your furnace will operate  
economically and dependably. Instructions for basic mainte-  
nance are found on this and the following pages. However,  
before beginning maintenance, follow these safety precautions:  
20  
!
WARNING  
Turn off electrical power supply to your furnace  
before removing the access doors to service or  
perform maintenance. A failure to follow this  
warning could result in personal injury/death or  
property damage.  
!
CAUTION  
Although special care has been taken to minimize  
sharp edges, be extremely careful when handling  
parts or reaching into the furnace. Failure to follow  
this caution would result in minor personal injury.  
For 58MTA and 58MVP  
21  
FILTERING OUT TROUBLE  
or  
!
CAUTION  
Never operate your furnace without a filter in place.  
Doing so may damage the furnace blower motor.  
An accumulation of dust and lint on internal parts  
of your furnace can cause a loss of efficiency and  
would cause minor property or product damage.  
For 58MCA and 58MXA  
22  
A dirty air filter will cause a loss of airflow in your duct  
system. When excessive loss of airflow occurs, the furnace  
may cycle on its safety controls. If this condition is left unat-  
tended, the furnace will eventually lock out. It is recom-  
mended that the furnace air filter be checked every 3 or 4  
weeks and cleaned if necessary.  
6. Replace the main furnace door. (See Fig. 16.)  
7. If the furnace is being shut down because of a malfunc-  
tion, call your dealer as soon as possible.  
If installed with factory-specified disposable media filter,  
check or replace filter before each heating and cooling sea-  
son. Replace disposable media filter at least once a year.  
!
CAUTION  
Furnace is not to be installed, operated, and then  
turned off and left turned off in an unoccupied  
structure during winter. (See “Heading South for  
the Winter” procedures in maintenance section on  
page 9). Freeze damage to furnace would occur.  
The air filter is normally located in the blower compartment  
(See Fig. 3 or 4.) or in the factory-supplied filter cabinet  
attached to the side or bottom of the furnace casing. If air  
filter has been installed in another location, contact your deal-  
er for instructions. To inspect, clean, and/or replace the air  
filter(s), follow these steps:  
1. Turn off electrical supply to furnace. (See Fig. 20.)  
2. Remove door/access panel  
• AIR FILTERS(S) LOCATED IN BLOWER COMPART-  
MENT  
PERFORMING ROUTINE  
MAINTENANCE  
NOTE: The qualified installer or agency must use only  
factory-authorized replacement parts, kits, and accessories  
when modifying this product.  
a. Remove main furnace door. (See Fig. 23.)  
b. Remove blower access panel. (See Fig. 24.)  
NOTE: It will be necessary to remove 2 screws  
Installing and servicing heating equipment can be hazard-  
ous due to gas and electrical components.  
• AIR FILTER LOCATED IN FILTER CABINET  
7
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a. Remove filter cabinet door (See Fig. 25 and 26.)  
NOTE: It will be necessary to remove 1 thumbscrew  
3. Remove air filter from furnace.  
• AIR FILTER LOCATED IN BLOWER COMPARTMENT  
BOTTOM:  
a. Slide filter retainer sideways until it is free of latch. (See  
Fig. 27.)  
b. Slide air filter out of furnace. (See Fig. 28.)  
• AIR FILTER(S) LOACTED IN BLOWER COMPART-  
MENT SIDE:  
a. Remove filter retainer from latch. (See Fig. 29.)  
b. Gently remove air filter and carefully turn the dirty side up  
(if dirty) to avoid spilling dirt from the filter. (See Fig. 30.)  
• AIR FILTER LOCATED IN FILTER CABINET:  
a. Slide air filter out of furnace. Keep dirty side up (if dirty)  
to avoid spilling dirt. (See Fig. 31 and 32.)  
4. Inspect the filter. If torn, replace it.  
NOTE: If washable filter that was shipped with the furnace has  
been replaced by:  
29  
30  
b) Electronic air cleaner (EAC) – Refer to EAC Owner’s  
Manual for maintenance information.  
5. If washable filter, wash filter (if dirty) in sink, bathtub, or out-  
side with a garden hose. Always use cold tap water. A mild  
liquid detergent may be used if necessary. Spray water  
through filter in the opposite direction of airflow.Allow filter  
to dry.  
6. Reinstall clean air filter  
7. Reinstall filter retainer (for blower compartment locations  
only)  
a) Factory specified disposable media filter–Do not clean. If  
dirty, replace only with media filter having the same part  
number and size. Install with airflow direction arrow point-  
ing towards blower.  
8. Replace blower access panel and main furnace door (See  
Fig. 33 and 34.) or filter cabinet door (Fig. 35 and 36.)  
9. Turn on electrical supply to furnace.  
If your furnace air filter needs to be replaced, be sure to use a  
factory-authorized filter of the same size that was orginally sup-  
plied. Use the filter tables and compare your furnace size with the  
proper filter size.  
23  
24  
31  
32  
25  
26  
33  
34  
27  
28  
8
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When dirt, soot, scale, or rust is allowed to build up, your fur-  
nace can suffer a loss of efficiency and perform improperly.  
Accumulations on the main burners can result in firing out of  
normal sequence. This delayed ignition creates an alarmingly  
loud sound.  
!
CAUTION  
If your furnace makes an especially loud noise  
when the main burners light, shut down your fur-  
nace and call your dealer. Failure to follow this  
caution would result in minor property damage.  
To inspect the combustion area and vent system, you will  
need a flashlight. Refer to Fig. 3 or 4, and proceed as follows:  
35  
36  
1. Turn off the gas and electrical supplies to the furnace and  
remove the main furnace door. (See Fig. 9, 10, and 11.)  
2. Remove burner enclosure front. (See Fig. 37 or 38.)  
Inspect the gas burners, igniter area, and remainder of furnace  
for dirt, rust, soot, or scale.  
FURNACE AIR FILTER TABLE  
AIR FILTER LOCATED IN BLOWER COMPARTMENT  
FURNACE  
CASING  
FILTER SIZE (IN)  
FILTER  
TYPE  
WIDTH (IN.) Side Return†  
Bottom Return  
(1) 16 x 25 x 1*  
(1) 20 x 25 x 1*  
17-1/2  
21  
(1) 16 x 25 x 1*  
(1) 16 x 25 x 1  
Cleanable  
Cleanable  
Cleanable  
!
CAUTION  
If dirt, rust, soot, or scale accumulations are found,  
call your dealer. Do not operate your furnace. Failure  
to follow this caution would result in minor property  
or product damage.  
24-1/2  
(1 or 2) 16 x 25 x 1 (1) 24 x 25 x 1*  
AIR FILTER LOCATED IN FILTER CABINET  
FILTER  
CABINET  
HEIGHT (IN)  
FILTER  
SIZE (IN)  
FILTER  
TYPE  
3. Inspect the combustion-air and vent PVC pipes for sags,  
holes, cracks, or disconnections. Horizontal portions of  
pipes must slope downward toward furnace.  
16  
20  
24  
(1) 16 x 25 x 1*  
or (1) 16 x 25 x 4-5/16  
Cleanable or  
Disposable  
(1) 20 x 25 x 1*  
or (1) 20 x 25 x 4-5/16  
Cleanable or  
Disposable  
(1) 24 x 25 x 1*  
or (1) 24 x 25 x 4-5/16  
Cleanable or  
Disposable  
* Factory-provided with the furnace. Filters may be field modified by cutting-  
filter material and support rods (3) in filters. Alternate sizes and additional  
filters may be ordered from your dealer.  
Upflow only.  
Upflow  
Downflow  
37  
38  
!
CAUTION  
4. Reinstall burner enclosure front.  
Use care when cutting support rods in filters to  
protect against flying pieces and sharp rod ends.  
Wear safety glasses, gloves, and appropriate pro-  
tective clothing. Failure to follow this caution  
could result in personal injury.  
5. If your furnace is free of the above conditions, replace  
main furnace door and turn on electrical and gas supplies  
to the furnace. (See Fig. 16, 17, and 18.)  
6. Start the furnace and observe its operation. Watch the  
burner flames to see if they are clear blue, almost transpar-  
ent. (See Fig. 36.) If you observe a suspected malfunction,  
or the burner flames are not clear blue, call your dealer.  
COMBUSTION AREA AND VENT SYSTEM  
!
DANGER  
If holes are found in the pipes or if any portion has  
become disconnected, toxic fumes can escape into  
your home. DO NOT OPERATE YOUR FURNACE.  
Call your dealer for service. Failure to follow this  
warning could result in personal injury or death.  
Visually inspect the combustion area and vent system before  
each heating season. Make sure that all PVC pipes leading  
into the combustion area and vent are free from any cracks  
and sags. Check the combustion-air intake and vent pipe on  
the outside of your home for blockage.  
39  
9
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HEADING SOUTH FOR THE WINTER?  
DON’T FORGET YOUR FURNACE!  
8. Remove funnel and tube from inducer housing and  
replace drain connection cap and clamp.  
9. Replace main furnace door. (See Fig. 34.)  
10. Propylene glycol need not be removed before restarting  
furnace.  
!
CAUTION  
If the furnace is installed in an unconditioned space  
where the ambient temperatures may be 32°F or  
lower, freeze protection measures must be taken to  
prevent minor property or product damage.  
A CHECK-UP CHECKLIST  
Your furnace represents an important investment in your fami-  
ly’s comfort and your home’s value. To keep it performing  
properly and to prevent future problems, have a trained service  
specialist give your furnace a professional check-up annually.  
The following checklist can be used as a guideline to proper  
service:  
Since the furnace uses a condensing heat exchanger, some water  
will accumulate in the unit as a result of the heat transfer process.  
Therefore, once it has been operated, it cannot be turned off and  
left off for an extended period of time when temperatures will  
reach 32°F or lower unless winterized. Follow these procedures  
to winterize your furnace:  
• Inspect all flue gas passages, burners, heat exchangers, cou-  
pling box(es), and inducer assembly.  
• Inspect all combustion-air and vent piping inside structure  
and vent pipe termination outside the structure.  
1. Obtain propylene glycol (RV/swimming pool antifreeze  
or equivalent).  
• Check gas pipes leading to and inside of your furnace for leaks.  
• Inspect and clean the blower motor and wheel.  
!
CAUTION  
Do not use ethylene glycol (Prestone II antifreeze  
coolant or equivalent). Failure of plastic compo-  
nents will occur.  
NOTE: The inducer and blower motors are pre-lubricated and  
require no additional lubrication. These motors can be identified  
by the absence of oil ports on each end of the motor.  
• Inspect and change or clean air filters(s) if necessary.  
2. Turn off electrical supply to the furnace. (See Fig. 20.)  
3. Remove main furnace door. (See Fig. 23.)  
4. Remove upper inducer housing drain connection cap.  
(See Fig. 40.)  
• Inspect all supply- and return-air ducts for obstructions, air  
leaks, and insulation. Remedy any problem when necessary.  
• Inspect the return-air duct connections(s) at the furnace to en-  
sure it is physically sound, sealed to the furnace casing, and ter-  
minates outside the space containing the furnace.  
• Inspect electrical wiring, connections, and components for  
loose connections.  
• Perform an operational checkout to determine whether your  
furnace is working properly and if it requires adjustments.  
• Inspect all condensate drain tubes and condensate trap assem-  
bly for leaks. The condensate removal system should be cleaned  
annually by a qualified service agency. Refer to the Service and  
Maintenance Instructions for further information.  
• Examine the physical support of the furnace. Support should  
be sound with not cracks, sagging, gaps, etc. around the base.  
40  
• Check furnace for any obvious signs of deterioration.  
BEFORE YOU REQUEST A SERVICE  
CALL  
If your furnace is not operating or not performing properly,  
you may save the expense of a service call by checking a few  
things yourself before calling for service.  
FOR INSUFFICIENT AIRFLOW:  
• Check for dirty air filter(s).  
• Check for blocked return-air or supply-air grilles throughout  
your home. Ensure they are open and unobstructed.  
41  
If problem still exists, call your dealer for service.  
IF FURNACE FAILS TO OPERATE:  
5. Connect field-supplied 1/2-in. ID tube to upper inducer  
housing drain connection.  
6. Insert field-supplied funnel into tube.  
Follow this checklist step by step, advancing to the next step  
only if furnace fails to start.  
7. Pour 1 quart of antifreeze into funnel/tube. Antifreeze  
should run through inducer housing, overfill condensate  
trap, and flow into open field drain. (See Fig. 41.)  
• Check thermostat for proper temperature. Is thermostat set  
above room temperature?  
10  
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• Is thermostat set on HEAT?  
• Check for obstructions around the vent termination.  
• Check fuses and circuit breakers. Is electrical supply on?  
If the furnace still fails to operate, call your service representa-  
tive.  
• Is manual shutoff valve in gas supply pipe in open position?  
(Follow start-up procedures if you open gas valve.)  
For your convenience, record the furnace product and serial  
numbers on back page. Should you ever require service, you  
will have ready access to the information needed by your ser-  
vice representative.  
NOTE: Turn off electrical supply before continuing with  
checklist.  
• Is control switch on gas valve in ON position? (Follow start-  
up procedures if you must reset switch to ON position.)  
This furnace has a light-emitting-diode (LED) status code dis-  
play to aid the installer, service technician, or homeowner while  
installing or servicing the unit. The LED code can be seen by  
removing the main furnace door and viewing the LED through  
the view port in the blower access panel.  
• Checkmanualresetamerolloutswitchlocatedontheburner  
box. (See Fig. 3 or 4.) If furnace has experienced high temper-  
ature conditions, this switch will shut off the furnace. Reset it  
by pushing the button on the switch. If it trips again, shut down  
the furnace and call for service. See “Shutting DownYour Fur-  
nace” section in this manual.  
11  
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INSTALLATION DATA  
Date Installed  
AIR CONDITIONER OR HEAT PUMP  
OUTDOOR UNIT:  
Dealer Name  
Address  
City  
Product No.  
Model No.  
Serial No.  
INDOOR COIL:  
Product No.  
Model No.  
State  
Zip  
Telephone  
FURNACE  
Product No.  
Model No.  
Serial No.  
Serial No.  
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or the classified section of your local telephone directory under the  
“Heating Equipment’’ or “Air Conditioning Contractors & Systems’’ heading for dealer listing by brand name.  
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.  
Carrier Corporation 7310 West Morris St. Indianapolis, IN 46231  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Copyright 2004 Carrier Corporation  
Form: OM58-114  
Replaces: OM58-108 Printed in the U.S.A. a  
8-04  
PC 101  
Catalog No. 535-80143  
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