Carrier Furnace 58UVB User Manual

58UVB  
DEDICATED UPFLOW CONDENSING  
GAS FURNACE  
Owner’s Information Manual  
NOTE TO INSTALLER:  
THIS MANUAL MUST BE LEFT WITH THE EQUIPMENT  
USER.  
CERTIFIED  
USER: Please read all instructions in the manual and retain all  
manuals for future reference.  
!
As an ENERGY STAR® Partner,  
Carrier Corporation has deter-  
mined that this product meets  
the ENERGY STAR® guidelines  
for energy efficiency.  
WARNING  
FIRE OR EXPLOSION HAZARD  
Failure to follow safety warnings exactly could result in  
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.  
--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 POISONING HAZARD  
Failure to follow this warning could result in personal  
injury and/or death.  
A05097  
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.  
Do not use this furnace if any part has been under water.  
A flood--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.  
1
 
FURNACE COMPONENTS  
17  
3
1. Combustion--air intake connection to ensure contaminant--  
free air (right or left side).  
2
2. Burner sight glass for viewing burner flame.  
3. Burner assembly (inside). Operates with energy--saving  
inshot burners and hot surface igniter for safe, dependable  
heating.  
4. Redundant gas valve. Safe and 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 (location in furnace may vary).  
9. Condensate drain connection. Collects moisture  
condensed from burned gases for disposal into home drain  
system. (Location in furnace varies.)  
12  
1
4
6
18  
5
5
11  
15  
14  
13  
7
16  
9
8
19  
10. Heavy--duty blower. Circulates air across the heat  
exchangers to transfer heat into the home.  
10  
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.  
A02264  
Fig. 2 -- Model 58UVB Furnace  
(Upflow Only)  
13. Furnace control board.  
14. 3--amp fuse provides electrical and component protection.  
15. Light emitting diode (LED) on furnace control board.  
Status 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.  
3
 
S
S
Do not cover the furnace, store trash or debris near it, or  
in any way block the flow of fresh air to the unit.  
SAFETY CONSIDERATIONS  
Recognize safety information. This is the safety--alert symbol  
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.  
. 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. 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 may result  
in minor personal injury or product and property damage. NOTE  
is used to highlight suggestions which will result in enhanced  
installation, reliability or operation.  
S
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.  
To minimize the possibility of serious personal injury, fire,  
furnace damage, or improper operation; carefully follow these  
safety rules:  
!
WARNING  
S
Your gas furnace uses air from outside the home for  
combustion and vents flue gas to the outdoors. It is not  
to be installed using indoor air for combustion. The  
vent pipe must terminate outside the structure and must  
not be obstructed in any way. The air--intake pipe must  
terminate outside the structure or in a well ventilated  
area that is isolated from the living space and the garage  
(e.g. well ventilated attic or crawlspace). Do not block  
or obstruct air openings on furnace or spaces around  
furnace.  
FIRE OR EXPLOSION HAZARD  
Failure to follow this warning could result in 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 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 installed, and the space around the  
furnace.  
BEFORE STARTING YOUR FURNACE  
Examine the furnace installation monthly 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  
physically 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.  
A05098  
4. The physical support of the furnace is sound without  
sagging cracks, gaps, etc. around the base.  
Fig. 3 -- Venting  
5. There are no obvious signs of deterioration of the furnace.  
6. The burner flames are in good adjustment. (See Fig. 5.)  
S
Keep the area around your furnace clear and free of  
combustible materials, gasoline, and other flammable  
liquids and vapors.  
A92182  
A92330  
Fig. 4 -- Combustible Materials  
Fig. 5 -- Burner Flame  
4
 
Steps For Starting Your Furnace  
STARTING AND SHUTTING DOWN  
YOUR FURNACE  
1. Set your room thermostat to the lowest temperature  
setting. (See Fig. 7.)  
2. Close the external manual gas valve. (See Fig. 8.)  
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:  
S
Never attempt to manually light the burners with a  
match or other source of flame.  
®
A95166  
Fig. 7 -- Lowest Temperature Setting  
C
L
O
S
E
A92319  
Fig. 6 -- Do Not Light Burner with Match  
S
S
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.  
A06188  
Fig. 8 -- Close Valve  
3. Turn OFF electrical supply to the furnace. (See Fig. 9.)  
4. Remove main furnace door. (See Fig. 10.)  
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.  
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. 11 or 12.) 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.  
!
6. After waiting 5 minutes, turn the control switch on the gas  
control to the ON position. (See Fig. 13 or 14.)  
WARNING  
FIRE AND EXPLOSION HAZARD  
Failure to follow this warning could result in personal  
injury/death or property damage.  
Should the gas supply fail to shut off or if overheating  
occurs, turn off the manual gas valve to the furnace  
BEFORE turning off the electrical supply. (See Fig. 8.)  
S
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:  
A92185  
Fig. 9 -- Turn Off Electrical Supply  
5
 
1
M
3
O
P
F
F
2
C
ON  
A06339  
Fig. 14 -- Control Switch to ON  
7. Replace main furnace door. (See Fig. 15.)  
A05099  
Fig. 10 -- Remove Furnace Door  
8. Turn ON the electrical supply to the furnace and wait 1  
minute. (See Fig. 16.)  
9. Open the external manual gas valve. (See Fig. 17.)  
10. Set the room thermostat to a temperature slightly above  
the room temperature. This will automatically signal the  
furnace to start.  
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.  
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 30 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.  
A04150  
Fig. 11 -- Control Switch to OFF  
1
M
3
O
P
F
F
2
C
ON  
A05100  
Fig. 15 -- Furnace Door Replaced  
A06338  
Fig. 12 -- Control Switch to OFF  
A04151  
A92359  
Fig. 13 -- Control Switch to ON  
Fig. 16 -- Turn On Electrical Supply  
6
 
4. Turn the switch on the gas control to the OFF position.  
(See Fig. 20 or 21.)  
A06189  
Fig. 17 -- Open Valve  
NOTE: If the burners fail to ignite after 4 attempts, the furnace  
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.  
A92185  
Fig. 19 -- Turn Off Electrical Supply  
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. The  
few degrees at the top of your thermostat “comfort level”  
are the most costly degrees to obtain.  
When the room temperature drops below the temperature selected  
on the thermostat, the furnace will switch on automatically.  
When the room temperature reaches the temperature selected on  
the thermostat, the furnace will be switched off automatically.  
A04150  
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 continuously.  
Continuous fan keeps the temperature level in your home more  
evenly balanced. It also permits the indoor air to be continuously  
filtered. ComfortFant, 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.  
Fig. 20 -- Control Switch to OFF  
1
M
3
O
P
F
F
2
C
ON  
Shutting Down Your Furnace  
A06338  
Fig. 21 -- Control Switch to OFF  
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:  
5. Replace the main furnace door. (See Fig. 15.)  
6. If the furnace is being shut down because of  
malfunction, call your dealer as soon as possible.  
a
!
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 12).  
®
PERFORMING ROUTINE  
MAINTENANCE  
A95166  
Fig. 18 -- Lowest Temperature Setting  
NOTE: The qualified installer or agency must use only  
factory--authorized replacement parts, kits, and accessories when  
modifying this product.  
1. Set your room thermostat to the lowest temperature  
setting. (See Fig. 18.)  
2. Turn off electrical supply to the furnace. (See Fig. 19.)  
3. Remove main furnace door. (See Fig. 10.)  
Installing and servicing heating equipment can be hazardous due  
to gas and electrical components.  
7
 
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.  
(1.) Remove main furnace door. (See Fig. 22.)  
(2.) Remove blower access panel. (See Fig. 23.)  
NOTE: It will be necessary to remove 2 screws  
b. Air Filters Located in Filter Cabinet  
All other operations must be performed by trained and qualified  
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.  
Remove filter cabinet door. (See Fig. 24 and 25.)  
NOTE: It will be necessary to remove 1 thumbscrew  
3. Remove air filter from furnace.  
With proper maintenance and care, your furnace will operate  
economically and dependably. Instructions for basic maintenance  
are found on this and the following pages. However, before  
beginning maintenance, follow these safety precautions:  
a. Air Filters Located in Blower Compartment Bottom:  
(1.) Slide filter retainer sideways until it is free of  
latch. (See Fig. 26.)  
(2.) Slide air filter out of furnace. (See Fig. 27.)  
b. Air Filters Located in Blower Compartment Side:  
(1.) Remove filter retainer from latch. (See Fig. 28.)  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
(2.) Gently remove air filter and carefully turn the  
dirty side up (if dirty) to avoid spilling dirt from  
the filter. (See Fig. 29.)  
Failure to follow this warning could result in personal  
injury/death.  
Turn off electrical power supply to your furnace before  
removing the access doors to service or perform  
maintenance.  
c. Air Filter Located in Filter Cabinet:  
Slide air filter out of furnace. Keep dirty side up (if  
dirty) to avoid spilling dirt. (See Fig. 30 and 31.)  
4. Inspect the filter. If torn, replace it.  
NOTE: If washable filter that was shipped with the furnace has  
been replaced by:  
!
CAUTION  
--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 pointing towards blower.  
--Electronic air cleaner (EAC): Refer to EAC Owner’s Manual  
for maintenance information.  
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.  
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.  
A05099  
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 unattended, the furnace  
will eventually lock out. It is recommended that the furnace air  
filter be checked every 3 or 4 weeks and cleaned if necessary.  
Fig. 22 -- Removing Furnace Door  
If installed with factory--specified disposable media filter, check  
or replace filter before each heating and cooling season. Replace  
disposable media filter at least once a year.  
The air filter is normally located in the blower compartment 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 dealer for instructions. To inspect,  
clean, and/or replace the air filter(s), follow these steps:  
1. Turn off electrical supply to furnace. (See Fig. 19.)  
2. Remove door/access panel.  
A93204  
a. Air Filters Located in Blower Compartment  
Fig. 23 -- Removing Blower Access Panel  
8
 
A93011  
A06190  
Fig. 27 -- Slide Air Filter Out of Furnace  
Fig. 24 -- Removing Side Filter Cabinet Door  
A93012  
Fig. 28 -- Removing Filter Retainer from Latch  
A06191  
Fig. 25 -- Removing Bottom Filter Cabinet Door  
A93010  
A93013  
Fig. 26 -- Sliding Filter Retainer Sideways  
Fig. 29 -- Removing Air Filter  
9
 
A00227  
Fig. 30 -- Slide Side Filter Out of Furnace  
A05100  
Fig. 33 -- Replace Furnace Door  
A00228  
Fig. 31 -- Slide Bottom Filter Out of Furnace  
5. If washable filter, wash filter (if dirty) in sink, bathtub, or  
outside 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.  
A06192  
Fig. 34 -- Replace Side Filter Cabinet Door  
6. Reinstall clean air filter.  
7. Reinstall filter retainer (for blower compartment locations  
only).  
8. Replace blower access panel and main furnace door (Fig.  
32 and 33.) or filter cabinet door. (Fig. 34 and 35.)  
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  
supplied. Use the filter tables and compare your furnace size with  
the proper filter size.  
A93205  
A06193  
Fig. 32 -- Replace Blower Access Panel  
Fig. 35 -- Replace Bottom Filter Cabinet Door  
10  
 
FURNACE AIR FILTER TABLE  
!
CAUTION  
AIR FILTER LOCATED IN BLOWER COMPARTMENT  
FURNACE  
FILTER SIZE (IN)  
UNIT OPERATION HAZARD  
FILTER  
TYPE  
CASING  
WIDTH  
(IN.)  
Side  
Bottom  
Return*  
Failure to follow this caution may result in property  
damage.  
Return*  
17---1/2  
21  
24---1/2  
(1) 16 x 25 x 1  
(1) 16 x 25 x 1  
(1 or 2) 16 x 25 x 1  
(1) 16 x 25 x 1  
(1) 20 x 25 x 1  
(1) 24 x 25 x 1  
Cleanable  
Cleanable  
Cleanable  
If your furnace makes an especially loud noise when the  
main burners light, shut down your furnace and call your  
dealer.  
AIR FILTER LOCATED IN FILTER CABINET  
FILTER CABINET  
HEIGHT (IN)  
FILTER  
SIZE (IN)  
FILTER  
TYPE  
To inspect the combustion area and vent system, you will need  
a flashlight. Refer to Fig. 3 and proceed as follows:  
Cleanable or  
Disposable  
16  
(1) 16 x 25 x 1*  
1. Turn off the gas and electrical supplies to the furnace and  
remove the main furnace door. (See Fig. 8, 9, and 10.)  
(1) 20 x 25 x 1*  
or (1) 20 x 25 x  
4---5/16  
Cleanable or  
Disposable  
20  
2. Remove burner enclosure front. (See Fig. 36.)  
(1) 24 x 25 x 1*  
or (1) 24 x 25 x  
4---5/16  
Cleanable or  
Disposable  
Inspect the gas burners, igniter area, and remainder of furnace for  
dirt, rust, soot, or scale.  
24  
*Factory---provided with the furnace. Filters may be field modified by  
cutting filter material and support rods (3) in filters.  
{ Upflow only. Alternate sizes and additional filters may be ordered from  
your dealer.  
!
WARNING  
CARBON MONOXIDE POISONING HAZARD  
!
WARNING  
Failure to follow this warning could result in personal  
injury or death.  
PERSONAL INJURY HAZARD  
If dirt, rust, soot, or scale accumulations are found, call  
your dealer. Do not operate your furnace.  
Failure to follow this warning could result in personal  
injury.  
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.  
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.  
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.  
4. Reinstall burner enclosure front.  
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. 15, 16, and 17.)  
6. Start the furnace and observe its operation. Watch the  
burner flames to see if they are clear blue, almost  
transparent. (See Fig. 37.) If you observe a suspected  
malfunction, or the burner flames are not clear blue, call  
your dealer.  
!
WARNING  
CARBON MONOXIDE POISONING HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
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.  
Check the combustion--air intake and vent pipe on the outside of  
your home for blockage.  
When dirt, soot, scale, or rust is allowed to build up, your furnace  
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.  
A00223  
Fig. 36 -- Remove Burner Enclosure Front  
11  
 
A92330  
Fig. 37 -- Burner Flame  
Heading South for the Winter?  
Don’t Forget Your Furnace!  
A06456  
Fig. 38 -- Upper Inducer Housing Drain  
Connection Cap  
!
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.  
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:  
1. Obtain propylene glycol (RV/swimming pool antifreeze or  
equivalent).  
A06457  
Fig. 39 -- Pour Antifreeze  
!
CAUTION  
5. Connect field--supplied 1/2--in. ID tube to upper inducer  
housing drain connection.  
UNIT COMPONENT DAMAGE HAZARD  
6. Insert field--supplied funnel into tube.  
Failure to follow this caution may result in damage to the  
furnace and other property damage.  
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. 39.)  
Do not use ethylene glycol (Prestone II antifreeze coolant or  
equivalent). Failure of plastic components may occur.  
8. Remove funnel and tube from inducer housing and replace  
drain connection cap and clamp.  
2. Turn off electrical supply to the furnace. (See Fig. 19.)  
3. Remove main furnace door. (See Fig. 22.)  
9. Replace main furnace door. (See Fig. 33.)  
4. Remove upper inducer housing drain connection cap.  
(See Fig. 38.)  
10. Propylene glycol need not be removed before restarting  
furnace.  
12  
 
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.  
!
CAUTION  
UNIT AND PROPERTY DAMAGE HAZARD  
Failure to follow this warning could result in damage to  
unit components.  
For Insufficient Airflow:  
This furnace is designed for continuous return--air  
minimum temperature of 60_F db or intermittent operation  
down to 55_F db, such as when used with a night setback  
thermostat. Return--air temperature must not exceed 85_F  
db.  
S
S
Check for dirty air filter(s).  
Check for blocked return--air or supply--air grilles  
throughout your home. Ensure they are open and  
unobstructed.  
If problem still exists, call your dealer for service.  
If you choose to leave your furnace on during extended absences  
do not set your thermostat lower than the limits shown in the  
Caution box above.  
To protect your property from damage from potential problems  
due to unintended interruptions in utility services or other events,  
it is recommended that you either winterize your plumbing  
system or have someone check on your house regularly while  
you are away.  
If Furnace Fails to Operate:  
Follow this checklist step by step, advancing to the next step only  
if furnace fails to start.  
S
Check thermostat for proper temperature. Is thermostat  
set above room temperature?  
S
S
Is thermostat set on HEAT?  
Your dealer or a licensed plumber can give you additional advice  
about winterizing your plumbing system.  
Check fuses and circuit breakers. Is electrical supply  
on?  
A CHECK--UP CHECKLIST  
S
Is manual shutoff valve in gas supply pipe in open  
position? (Follow start--up procedures if you open gas  
valve.)  
Your furnace represents an important investment in your family’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:  
NOTE: Turn off electrical supply before continuing with  
checklist.  
S
Is control switch on gas valve in ON position? (Follow  
startup procedures if you must reset switch to ON  
position.)  
S
Inspect all flue gas passages, burners, heat exchangers,  
coupling box(es), and inducer assembly.  
S
Inspect all combustion--air and vent piping inside  
structure and vent pipe termination outside the  
structure.  
S
Check manual reset flame rollout switch located on the  
burner box. If furnace has experienced high  
temperature 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 Down Your Furnace” section in  
this manual.  
S
S
Check gas pipes leading to and inside your furnace for  
leaks.  
Inspect and clean the blower motor and wheel.  
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.  
S
Check for obstructions around the vent termination  
outside the structure.  
S
S
Inspect and change or clean air filters(s), if necessary.  
If the furnace still fails to operate, call your service representative.  
Inspect all supply-- and return--air ducts for  
obstructions, air leaks, and insulation. Remedy any  
problem when necessary.  
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 service  
representative.  
S
Inspect the return--air duct connections(s) at the furnace  
to ensure it is physically sound, sealed to the furnace  
casing, and terminates outside the space containing the  
furnace.  
This furnace has a light--emitting--diode (LED) status code  
display 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. (See Fig. 2.)  
S
S
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.  
S
Inspect all condensate drain tubes and condensate trap  
assembly 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.  
S
S
Examine the physical support of the furnace. Support  
should be sound with no cracks, sagging, gaps, etc.  
around the base.  
Check furnace for any obvious signs of deterioration.  
13  
 
INSTALLATION DATA  
Date Installed  
______________________________  
AIR CONDITIONER OR HEAT PUMP  
OUTDOOR UNIT:  
Dealer Name  
_______________________________  
Product No.  
__________________________________  
Address  
Model No.  
____________________________________  
___________________________________  
City  
Serial No.  
_____________________________________  
_____________________________________  
State ______________ Zip ____________  
INDOOR COIL:  
Telephone  
_________________________________  
Product No.  
__________________________________  
Model No.  
____________________________________  
FURNACE  
Product No.  
_______________________________  
Serial No.  
_____________________________________  
Model No.  
_________________________________  
Serial No.  
_________________________________  
HEATING & COOLING  
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the  
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.  
Carrier Corporation S Indianapolis, IN  
Have available the Model N4o.6, 2Se3ri1es Letter, & Serial No. of your equipment to ensure correct replacement part.  
Copyright 2006 Carrier Corporation 7310 W. Morris St. Indianapolis, IN 46231  
Printed in the U.S.A.  
Edition Date: 09/06  
Catalog No: OM58---118  
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.  
Replaces: New  
14  
 

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