Carrier 58MCB Guide

MULTIPOISE, CONDENSING
DIRECT VENT/NON-DIRECT VENT 58MCB, 58MTB, 58MVB, 58MXB
GAS FURNACE
USER: Please read all instructions in
the manual and retain all manuals for
future reference.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
serious injury, death, or property damage.
!
NOTE TO INSTALLER:
THIS MANUAL MUST BE LEFT WITH THE
EQUIPMENT USER.
— 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.
WARNING:
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.
!
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.
USER’S INFORMATION MANUAL FOR OPERATION AND MAINTENANCE OF
YOUR GAS-FIRED FURNACE

2
TABLE OF CONTENTS
WELCOME TO A NEW GENERATION OF COMFORT . . . . . . . 2
FURNACE COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
STARTING AND SHUTTING DOWN YOUR FURNACE . . . . . . . 5
Steps for Starting Your Furnace. . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Shutting DownYour Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PERFORMING ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . 7
Filtering Out Trouble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COMBUSTIONAREA AND VENT SYSTEM . . . . . . . . . . . . . . . . . . . 9
Heading South for the Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
A CHECK-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
BEFORE YOU REQUEST A SERVICE CALL . . . . . . . . . . . . . . . . .11
INSTALLATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
WELCOME TO A NEW GENERATION
OF COMFORT
Congratulations! In light of rising energy costs, the 58MCB,
58MXB, 58MTB, and WeatherMaker Infinity, Multipoise, Gas-
Fired Condensing Furnaces are among the soundest investments
today’s homeowner can make.
Your new furnace is truly a triumph of technology in home heat-
ing. A revolutionary design employs 2 heat exchangers to
“squeeze” out the maximum amount of heat from the fuel con-
sumed. In fact, your new furnace is so efficient, over 90%* of the
heat generated during combustion is captured and delivered inside
your home. That is more than a 33%* increase in heating effi-
ciency over conventional furnaces.
These are among the most energy-efficient furnaces you can buy to-
day. They also are among the safest and most dependable. We are
proud of the technological advances incorporated into the design of
these furnaces.With only minimal care, your new furnace will deliver
many years of money-saving home comfort and enjoyment. Spend
just a few minutes with this manual to learn the operation of your new
furnace and the small amount of maintenance it takes to help keep it
operating at peak efficiency year after year.
*The output capacity and any representations of efficiency for this furnace are based on standard
U.S. Department of Energy test procedures.
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•• • •• •• • •••••
••
ULTRAHIGHEFFICIENCY
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MODEL 58MVB
VARIABLE-CAPACITY
AND MODEL 58MTB
TWO-STAGE FURNACES
As an ENERGY STAR®
partner, Carrier Corporation
has determined that this
product meets the ENERGY
STAR® guidelines for
energy efficiency.
CERTIFIED ®
MODELS 58MXB (SHOWN)
AND 58MCB FIXED-CAPACITY
FURNACES
1

3
FURNACE COMPONENTS
Combustion-air intake connection to ensure contami-
nant-free air (right or left side).
Burner sight glass for viewing burner flame.
Burner assembly (inside). Operates with energy-saving
inshot burners and hot surface igniter for safe,
dependable heating.
Redundant gas valve. Safe and efficient. Features 1 gas
control with 2 internal shutoff valves. Valve appearance
varies with furnace model.
Vent outlet. Uses PVC pipe to carry flue gas from the fur-
nace’s combustion system (right or left side).
Inducer motor. Pulls hot flue gases through the heat ex-
changers, maintaining negative pressure for added safety.
Blower access panel safety interlock switch.
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.)
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3
4
5
6
7
8
9
need art
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MODELS 58MCB, 58MXB, AND 58MTB
FURNACES (UPFLOW POSITION)
Heavy-duty blower. Circulates air across the heat ex-
changers to transfer heat into the home.
Secondary condensing heat exchanger (inside). Wrings
out more heat through condensation. Constructed with
polypropylene-laminated steel to ensure durability.
Primary serpentine heat exchanger (inside). Stretches fuel
dollars with the S-shaped heat-flow design. Solid con-
struction of corrosion-resistant aluminized steel means re-
liability.
Furnace control board.
3-amp fuse provides electrical and component protection.
Light emitting diode (LED) on furnace control board.
Status code light is for diagnosing furnace operation and
service requirements.
Pressure switch(es) ensure adequate flow of flue gas
through furnace and out vent system.
Rollout switch (manual reset) to prevent overtemperature.
Junction box for 115-v electrical power supply. (May be
located on right or left side)
Transformer (24v) behind furnace control board pro-
vides low-voltage power to furnace control board and
thermostat.
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15
16
17
18
19
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10
5
16
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418
217
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810
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217
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MODEL 58MVB
FURNACE (UPFLOW POSITION)

4
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
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 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, fire,
furnace damage, or improper operation;
carefully follow
these safety rules:
• 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.
• In a direct-vent (2-pipe) application, your furnace uses air
from outside the home for combustion and vents flue 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.
5
• In a non-direct vent (1-pipe) application, your furnace uses
air from adjacent to the furnace for combustion and vents flue
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 airflow
for efficient 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.
6
• Keep the area around your furnace clear and free of com-
bustible materials, gasoline, and other flammable liquids and
vapors.
7
• Do not cover the furnace, store trash or debris near it, or
in any way block the flow 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 fluorine. 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.
• 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.
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5
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 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.
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 burner flames are in good adjustment. (See Fig. 8.)
8
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:
• 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.
•
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. 10.)
2. Close the external manual gas valve. (See Fig. 11.)
10
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.
!
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in a fire
or explosion, and personal injury/death or prop-
erty damage.
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.)
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6
11 12
3. Turn OFF electrical supply to the furnace. (See Fig. 12.)
4. Remove main furnace door. (See Fig. 13.)
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 floor. If you smell gas,
STOP! Follow “B” on furnace label. If you don’t smell
gas, go to next step.
For 58MTB and 58MVB
14
For 58MCB and 58MXB
15
For 58MTB and 58MVB
16
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.)
18
19 20
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.
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.
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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.
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.
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 filtered. 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.
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:
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 21.)
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.)
22
For 58MTB and 58MVB
23
For 58MCB and 58MXB
24
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.
PERFORMING ROUTINE
MAINTENANCE
NOTE: The qualified installer or agency must use only
factory-authorized replacement parts, kits, and accessories
when modifying this product.
Installing and servicing heating equipment can be hazard-
ous due to gas and electrical components.
®
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).
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Only trained and qualified personnel should install, repair, or ser-
vice 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:
FILTERING OUT TROUBLE
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.
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.
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. 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
• AIR FILTER LOCATED IN FILTER CABINET
a. Remove filter cabinet door. (See Fig. 27 and 28.)
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. 29.)
b. Slide air filter out of furnace. (See Fig. 30.)
• AIR FILTER(S) LOACTED IN BLOWER COMPART-
MENT SIDE:
a. Remove filter retainer from latch. (See Fig. 31.)
b. Gently remove air filter and carefully turn the dirty side up
(if dirty) to avoid spilling dirt from the filter. (See Fig. 32.)
• 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. 33 and 34.)
4. Inspect the filter. If torn, replace it.
NOTE: If washable filter that was shipped with the furnace has
been replaced by:
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.
25 26
27
29 30
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.
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.
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.
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31 32
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)
8. Replace blower access panel and main furnace door (See
Fig. 35 and 36.) or filter cabinet door (Fig. 37 and 38.)
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.
33 34
35 36
37 38
* 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.
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.
A05100
FURNACE AIR FILTER TABLE
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN) FILTER
TYPESide Return†*Bottom Return*
17-1/2 (1) 16 x 25 x 1 (1) 16 x 25 x 1 Cleanable
21 (1) 16 x 25 x 1 (1) 20 x 25 x 1 Cleanable
24-1/2 (1 or 2) 16 x 25 x 1 (1) 24 x 25 x 1 Cleanable
AIR FILTER LOCATED IN FILTER CABINET
FILTER
CABINET
HEIGHT (IN) FILTER SIZE (IN) FILTER TYPE
16 (1) 16 x 25 x 1*
or (1) 16 x 25 x 4-5/16 Cleanable or Disposable
20 (1) 20 x 25 x 1*
or (1) 20 x 25 x 4-5/16 Cleanable or Disposable
24 (1) 24 x 25 x 1*
or (1) 24 x 25 x 4-5/16 Cleanable or Disposable
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in per-
sonal 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.
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in per-
sonal 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.
!
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10
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.Accumu-
lations on the main burners can result in firing out of normal
sequence. This delayed ignition creates an alarmingly loud sound.
To inspect the combustion area and vent system, you will
need a flashlight. 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.)
Inspect the gas burners, igniter area, and remainder of furnace
for dirt, rust, soot, or scale.
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.
39 40
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. 18, 19, and 20.)
6. Start the furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost transpar-
ent. (See Fig. 41.) If you observe a suspected malfunction,
or the burner flames are not clear blue, call your dealer.
41
HEADING SOUTH FOR THE WINTER?
DON’T FORGET YOUR FURNACE!
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).
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.)
42
43
5. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
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.
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.
!
!
Upflow Downflow
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 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.
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