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

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.

ed art

•• • •• •• • •••••

••

ULTRAHIGHEFFICIENCY

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

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.)

need art

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.

418

217

810

217

MODEL 58MVB

FURNACE (UPFLOW POSITION)

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.

• 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.

• Keep the area around your furnace clear and free of com-

bustible materials, gasoline, and other ﬂammable liquids and

vapors.

• Do not cover the furnace, store trash or debris near it, or

in any way block the ﬂow of fresh air to the unit.

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.

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.)

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.)

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.)

11 12

3. Turn OFF electrical supply to the furnace. (See Fig. 12.)

4. Remove main furnace door. (See Fig. 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

For 58MCB and 58MXB

For 58MTB and 58MVB

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.)

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.



A05099

OFF

A05118

A04151

OFF

A05100

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.)

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.)

For 58MTB and 58MVB

For 58MCB and 58MXB

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).

OFF

A05118

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

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.

A05099

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.

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.

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.

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.)

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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