Carrier Furnace 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  
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 ammable  
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 re  
department.  
— Installation and service must be performed by a  
qualied installer, service agency or the gas supplier.  
!
WARNING:  
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 re or explosion. A  
qualied 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.  
CARBON MONOXIDE POISONING HAZARD  
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.  
 
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.  
10  
8
19  
Air filter and retainer (location in furnace may vary).  
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 58MCB, 58MXB, AND 58MTB  
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.  
Status 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 58MVB  
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,  
CAUTION and NOTE. DANGER, WARNING and  
CAUTION are used with the safety-alert symbol. DANGER  
identies the most serious hazards which will result in severe  
personal injury or death. WARNING signies hazards which  
could result in personal injury or death. CAUTION is used  
to identify unsafe practices which may 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.  
To minimize the possibility of serious personal injury, re,  
furnace damage, or improper operation; carefully follow  
these safety rules:  
6
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.  
• Keep the area around your furnace clear and free of com-  
bustible materials, gasoline, and other ammable liquids and  
vapors.  
• In a direct-vent (2-pipe) application, your furnace uses air  
from outside the home for combustion and vents ue gas to  
the outdoors. This type of application will have 2 pipes run-  
ning from the furnace to the outdoors. (See Fig. 5.) In this  
application, the vent and air-intake pipes must terminate out-  
side the structure and must not be obstructed in any way. Do  
not block or obstruct air openings on furnace or spaces  
around furnace.  
7
• Do not cover the furnace, store trash or debris near it, or  
in any way block the ow of fresh air to the unit.  
In addition to the safety rules above, make sure that the fol-  
lowing combustion-air requirements are met for non-direct  
vent applications.  
• Combustion air must be clean and uncontaminated with  
chlorine or uorine. These compounds are present in many  
products around the home, such as water softener salts, laun-  
dry bleaches, detergents, adhesives, paints, varnishes, paint  
strippers, and plastics.  
Make sure the combustion air for your furnace does not con-  
tain 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.  
5
• In a non-direct vent (1-pipe) application, your furnace uses  
air from adjacent to the furnace for combustion and vents ue  
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. There-  
fore, the furnace must not be enclosed in an airtight room or  
be sealed behind solid doors. It must have adequate airow  
for efcient combustion and safe ventilation. Do not obstruct  
the combustion-air pipe in any way. The vent pipe must ter-  
minate outside the structure and must not be obstructed in any  
way. Do not block or obstruct air openings or space around  
furnace.  
• 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.  
• 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.  
4
 
STARTING AND SHUTTING DOWN  
YOUR FURNACE  
Instead of a continuously burning pilot ame 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:  
!
WARNING  
FIRE OR EXPLOSION HAZARD  
Failure to follow this warning could result in fire,  
personal injury/death or property damage.  
Do not keep combustible materials, gasoline, and  
other flammable liquids or vapors around your  
furnace.  
!
WARNING  
FIRE AND UNIT OPERATION HAZARD  
Failure to follow this warning could result in fire,  
personal injury/death or property damage.  
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.  
9
• Never attempt to manually light the burners with a match  
or other source of ame.  
• 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 oor. 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.  
Examine the furnace installation monthly to determine that:  
1. All ue gas carrying areas external to the furnace  
(i.e. chimney, vent connector) are clear and free of  
obstructions.  
• 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.  
2. The vent connector is in place, slopes upward and is phys-  
ically sound without holes or excessive corrosion.  
3. The return-air duct connection(s) is physically sound, is  
sealed to the furnace casing, and terminates outside the  
space containing the furnace.  
!
WARNING  
FIRE HAZARD  
4. The physical support of the furnace is sound without sag-  
ging cracks, gaps, etc. around the base.  
Failure to follow this warning could result in a fire  
or explosion, and personal injury/death or prop-  
erty damage.  
5. There are no obvious signs of deterioration of the furnace.  
Should the gas supply fail to shut off or if over-  
heating occurs, turn off the manual gas valve to  
the furnace BEFORE turning off the electrical sup-  
ply. (See Fig. 11.)  
6. The burner ames are in good adjustment. (See Fig. 8.)  
CHECK AIR FILTER: Before attempting to start your  
furnace, be sure the furnace lter 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. 10.)  
2. Close the external manual gas valve. (See Fig. 11.)  
8
®
10  
5
 
OR  
For 58MTB and 58MVB  
11 12  
3. Turn OFF electrical supply to the furnace. (See Fig. 12.)  
4. Remove main furnace door. (See Fig. 13.)  
16  
1
M
3
O
F
F
P
2
C
ON  
For 58MCB and 58MXB  
17  
6. After waiting 5 minutes, turn the control switch on the gas  
control to the ON position. (See Fig. 16 or 17.)  
13  
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. 14 or 15.) Then  
smell for gas, including near the oor. If you smell gas,  
STOP! Follow “B” on furnace label. If you don’t smell  
gas, go to next step.  
OR  
18  
For 58MTB and 58MVB  
14  
1
M
19  
20  
3
P
O
F
F
2
C
ON  
7. Replace main furnace door. (See Fig. 18.)  
8. Turn ON the electrical supply to the furnace and wait 1  
minute. (See Fig. 19.)  
9. Open the external manual gas valve. (See Fig. 20.)  
10. Set the room thermostat to a temperature slightly  
above the room temperature. This will automatically  
signal the furnace to start.  
For 58MCB and 58MXB  
11. When the furnace receives the start signal, the inducer is  
started. When the pressure switch senses that there is suf-  
cient combustion air, the hot surface igniter is energized.  
15  
6
 
After the hot surface igniter is heated for 17 seconds, the  
gas valve permits gas to ow 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 satises  
your comfort requirements.  
22  
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.  
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 ltered. ComfortFan™ –On all but the  
58MCB, 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.  
For 58MTB and 58MVB  
23  
1
M
3
P
O
F
F
2
C
ON  
For 58MCB and 58MXB  
SHUTTING DOWN YOUR FURNACE  
24  
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:  
6. Replace the main furnace door. (See Fig. 18.)  
7. If the furnace is being shut down because of a malfunc-  
tion, call your dealer as soon as possible.  
1. Set your room thermostat to the lowest temperature  
setting. (See Fig. 21.)  
!
CAUTION  
UNIT AND PROPERTY DAMAGE  
Failure to follow this caution may result in damage  
to the furnace and other property damage.  
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 10).  
®
PERFORMING ROUTINE  
MAINTENANCE  
NOTE: The qualied installer or agency must use only  
factory-authorized replacement parts, kits, and accessories  
when modifying this product.  
21  
2. Close the external manual gas valve (See Fig. 11.)  
3. Turn off electrical supply to the furnace. (See Fig. 22.)  
4. Remove main furnace door. (See Fig. 13.)  
5. Turn the switch on the gas control to the OFF position.  
(See Fig. 23 or 24.)  
Installing and servicing heating equipment can be hazard-  
ous due to gas and electrical components.  
7
 
Only trained and qualied personnel should install, repair, or ser-  
vice heating equipment. Untrained personnel can perform basic  
maintenance functions such as cleaning and replacing air lters.  
• AIR FILTER LOCATED IN FILTER CABINET  
a. Remove lter cabinet door. (See Fig. 27 and 28.)  
NOTE: It will be necessary to remove 1 thumbscrew  
3. Remove air lter from furnace.  
• AIR FILTER LOCATED IN BLOWER COMPARTMENT  
BOTTOM:  
a. Slide lter retainer sideways until it is free of latch. (See  
Fig. 29.)  
b. Slide air lter out of furnace. (See Fig. 30.)  
• AIR FILTER(S) LOACTED IN BLOWER COMPART-  
MENT SIDE:  
All other operations must be performed by trained and qual-  
ied 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:  
a. Remove lter retainer from latch. (See Fig. 31.)  
b. Gently remove air lter and carefully turn the dirty side up  
(if dirty) to avoid spilling dirt from the lter. (See Fig. 32.)  
• AIR FILTER LOCATED IN FILTER CABINET:  
a. Slide air lter out of furnace. Keep dirty side up (if dirty)  
to avoid spilling dirt. (See Fig. 33 and 34.)  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in per-  
sonal injury/death.  
Turn off electrical power supply to your furnace  
before removing the access doors to service or  
perform maintenance.  
4. Inspect the lter. If torn, replace it.  
NOTE: If washable lter that was shipped with the furnace has  
been replaced by:  
a) Factory specied disposable media lter–Do not clean. If  
dirty, replace only with media lter having the same part  
number and size. Install with airow direction arrow point-  
ing towards blower.  
!
CAUTION  
CUT HAZARD  
Failure to follow this caution may result in minor  
personal injury.  
Although special care has been taken to minimize  
sharp edges, be extremely careful when handling  
parts or reaching into the furnace.  
FILTERING OUT TROUBLE  
!
CAUTION  
UNIT PERFORMANCE HAZARD  
Failure to follow this caution may result in product  
damage.  
25  
26  
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.  
A dirty air lter will cause a loss of airow in your duct  
system. When excessive loss of airow 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 lter be checked every 3 or 4  
weeks and cleaned if necessary.  
If installed with factory-specied disposable media lter,  
check or replace lter before each heating and cooling sea-  
son. Replace disposable media lter at least once a year.  
27  
28  
The air lter is normally located in the blower compartment  
(See Fig. 3 or 4.) or in the factory-supplied lter cabinet  
attached to the side or bottom of the furnace casing. If air  
lter has been installed in another location, contact your deal-  
er for instructions. To inspect, clean, and/or replace the air  
lter(s), follow these steps:  
1. Turn off electrical supply to furnace. (See Fig. 22.)  
2. Remove door/access panel  
• AIR FILTERS(S) LOCATED IN BLOWER COMPART-  
MENT  
a. Remove main furnace door. (See Fig. 25.)  
b. Remove blower access panel. (See Fig. 26.)  
NOTE: It will be necessary to remove 2 screws  
29  
30  
8
 
37  
38  
31  
32  
b) Electronic air cleaner (EAC) – Refer to EAC Owner’s  
Manual for maintenance information.  
FURNACE AIR FILTER TABLE  
AIR FILTER LOCATED IN BLOWER COMPARTMENT  
5. If washable lter, wash lter (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 lter in the opposite direction of airow.Allow lter  
to dry.  
6. Reinstall clean air lter  
7. Reinstall lter retainer (for blower compartment locations  
only)  
8. Replace blower access panel and main furnace door (See  
Fig. 35 and 36.) or lter cabinet door (Fig. 37 and 38.)  
9. Turn on electrical supply to furnace.  
FURNACE  
CASING  
FILTER SIZE (IN)  
FILTER  
TYPE  
WIDTH (IN.) Side Return* Bottom Return*  
17-1/2  
21  
(1) 16 x 25 x 1  
(1) 16 x 25 x 1  
(1) 16 x 25 x 1  
(1) 20 x 25 x 1  
Cleanable  
Cleanable  
Cleanable  
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  
If your furnace air lter needs to be replaced, be sure to use a  
factory-authorized lter of the same size that was orginally sup-  
plied. Use the lter tables and compare your furnace size with the  
proper lter size.  
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 eld modied by cutting-  
lter material and support rods (3) in lters.  
Upow only. Alternate sizes and additional lters may be ordered from your  
dealer.  
!
WARNING  
PERSONAL INJURY HAZARD  
Failure to follow this warning could result in per-  
sonal injury.  
33  
34  
Use care when cutting support rods in filters to protect  
against flying pieces and sharp rod ends. Wear safety  
glasses, gloves, and appropriate protective clothing.  
COMBUSTION AREA AND VENT SYSTEM  
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.  
!
WARNING  
CARBON MONOXIDE POISONING HAZARD  
Failure to follow this warning could result in per-  
sonal injury or death.  
35  
36  
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.  
9
 
Check the combustion-air intake and vent pipe on the outside  
of your home for blockage.  
HEADING SOUTH FOR THE WINTER?  
DON’T FORGET YOUR FURNACE!  
Whendirt, soot, scale, orrustisallowedtobuildup, yourfurnace  
can suffer a loss of efciency and perform improperly.Accumu-  
lations on the main burners can result in ring out of normal  
sequence. This delayed ignition creates an alarmingly loud sound.  
!
CAUTION  
UNIT AND PROPERTY DAMAGE HAZARD  
Failure to follow this caution may result in damage  
to the furnace and other property damage.  
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.  
!
CAUTION  
UNIT OPERATION HAZARD  
Failure to follow this caution may result in minor  
property damage.  
If your furnace makes an especially loud noise  
when the main burners light, shut down your fur-  
nace and call your dealer.  
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:  
To inspect the combustion area and vent system, you will  
need a ashlight. Refer to Fig. 3 or 4, and proceed as follows:  
1. Turn off the gas and electrical supplies to the furnace and  
remove the main furnace door. (See Fig. 11, 12, and 13.)  
2. Remove burner enclosure front. (See Fig. 39 or 40.)  
1. Obtain propylene glycol (RV/swimming pool antifreeze  
or equivalent).  
Inspect the gas burners, igniter area, and remainder of furnace  
for dirt, rust, soot, or scale.  
!
CAUTION  
UNIT COMPONENT DAMAGE HAZARD  
Failure to follow this caution may result in damage to  
the furnace and other property damage.  
Do not use ethylene glycol (Prestone II antifreeze  
coolant or equivalent). Failure of plastic components  
may occur.  
!
WARNING  
CARBON MONOXIDE POISONING HAZARD  
Failure to follow this warning could result in per-  
sonal injury or death.  
If dirt, rust, soot, or scale accumulations are found,  
call your dealer. Do not operate your furnace.  
2. Turn off electrical supply to the furnace. (See Fig. 22.)  
3. Remove main furnace door. (See Fig. 25.)  
4. Remove upper inducer housing drain connection cap.  
(See Fig. 42.)  
3. Inspect the combustion-air and vent PVC pipes for sags, holes,  
cracks, water leaks, blockage or disconnections. Horizontal  
portions of pipes must slope downward toward furnace.  
Upflow  
Downflow  
39  
40  
4. Reinstall burner enclosure front.  
42  
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. 18, 19, and 20.)  
6. Start the furnace and observe its operation. Watch the  
burner ames to see if they are clear blue, almost transpar-  
ent. (See Fig. 41.) If you observe a suspected malfunction,  
or the burner ames are not clear blue, call your dealer.  
43  
5. Connect eld-supplied 1/2-in. ID tube to upper inducer  
housing drain connection.  
10  
41  
 
6. Insert eld-supplied funnel into tube.  
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.  
7. Pour 1 quart of antifreeze into funnel/tube. Antifreeze  
should run through inducer housing, overll condensate  
trap, and ow into open eld drain. (See Fig. 43.)  
8. Remove funnel and tube from inducer housing and  
replace drain connection cap and clamp.  
9. Replace main furnace door. (See Fig. 36.)  
FOR INSUFFICIENT AIRFLOW:  
• Check for dirty air lter(s).  
10. Propylene glycol need not be removed before restarting  
furnace.  
• Check for blocked return-air or supply-air grilles throughout  
your home. Ensure they are open and unobstructed.  
A CHECK-UP CHECKLIST  
If problem still exists, call your dealer for service.  
IF FURNACE FAILS TO OPERATE:  
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:  
Follow this checklist step by step, advancing to the next step  
only if furnace fails to start.  
• Check thermostat for proper temperature. Is thermostat set  
above room temperature?  
• Inspect all ue gas passages, burners, heat exchangers, cou-  
pling box(es), and inducer assembly.  
• Is thermostat set on HEAT?  
• Check fuses and circuit breakers. Is electrical supply on?  
• Inspect all combustion-air and vent piping inside structure  
and vent pipe termination outside the structure.  
• Is manual shutoff valve in gas supply pipe in open position?  
(Follow start-up procedures if you open gas valve.)  
• Check gas pipes leading to and inside of your furnace for leaks.  
• Inspect and clean the blower motor and wheel.  
NOTE: Turn off electrical supply before continuing with  
checklist.  
NOTE: The inducer and blower motors are pre-lubricated and  
require no additional lubrication. These motors can be identied  
by the absence of oil ports on each end of the motor.  
• Is control switch on gas valve in ON position? (Follow start-  
up procedures if you must reset switch to ON position.)  
• 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.  
• Inspect and change or clean air lters(s) if necessary.  
• 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.  
• Check for obstructions around the vent termination outside  
the structure.  
• Inspect electrical wiring, connections, and components for  
loose connections.  
If the furnace still fails to operate, call your service representa-  
tive.  
• Perform an operational checkout to determine whether your  
furnace is working properly and if it requires adjustments.  
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.  
• Inspect all condensate drain tubes and condensate trap assem-  
bly for leaks. The condensate removal system should be cleaned  
annually by a qualied service agency. Refer to the Service and  
Maintenance Instructions for further information.  
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.  
• Examine the physical support of the furnace. Support should  
be sound with not cracks, sagging, gaps, etc. around the base.  
• Check furnace for any obvious signs of deterioration.  
11  
 
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 classied 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, specications or designs without notice and without incurring obligations.  
Copyright 2005 Carrier Corporation  
Replaces: OM58-114  
Printed in the U.S.A. a  
8-05  
PC 101  
Catalog No. OM58-117  
 

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