Carrier 58MCA Guide

MULTIPOISE, CONDENSING 58MCA, 58MTA, 58MVP, 58MXA

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.

NOTETO 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 IFYOU 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 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

qualiﬁedserviceagencyshouldbe 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

GENERAL FURNACE SAFETY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

FURNACE COMPONENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

BEFORE STARTING YOUR FURNACE

. . . . . . . . . . . . . . . . . . . . . . .4

STARTING AND SHUTTING DOWN YOUR FURNACE

. . . . . . .4

Steps for StartingYour Furnace. . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Shutting DownYour Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PERFORMING ROUTINE MAINTENANCE

. . . . . . . . . . . . . . . . . . .6

Filtering Out Trouble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

COMBUSTIONAREA AND VENT SYSTEM

. . . . . . . . . . . . . . . . . . .8

Heading South for the Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

A CHECK-UP CHECKLIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,10

BEFOREYOU REQUEST A SERVICE CALL

. . . . . . . . . . . . . . . . .10

INSTALLATION DATA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

WELCOMETO A NEW GENERATION

OF COMFORT

Congratulations! In light of rising energy costs, the 58MXA,

58MCA, 58MTA, 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

heatgeneratedduringcombustioniscapturedanddeliveredinside

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

thesefurnaces.Withonlyminimalcare,yournewfurnacewilldeliver

many years of money-saving home comfort and enjoyment. Spend

justafewminuteswiththismanual tolearntheoperationofyournew

furnace and the small amount of maintenance it takes to help keep it

operating at peak efﬁciency year after year.

*Theoutputcapacity and anyrepresentations of efﬁciencyfor this furnace are based on standard

U.S. Department of Energy test procedures.

GENERAL FURNACE SAFETY

1. Combustible Materials, GasolineWarning

. . . . . . . . . . . . . . . . . 1,4

2. Furnace Must be Kept Free and Clear of Insulating

MaterialWarning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3. Furnace NeedsAir for Combustion andVentilationWarning

. . .4

4. Starting (Lighting) and Shutting Down the

FurnaceWarning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

5. Proper Furnace Shutdown Procedures

. . . . . . . . . . . . . . . . . . . . . . .5

6. Flood DamageWarning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

7. Fire or Explosion HazardWarning

. . . . . . . . . . . . . . . . . . . . . . . . . .1

8. Carbon MonoxideWarning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

9. Service and Maintenance Electrical HazardWarning

. . . . . . . . . .7

10. ImproperVentWarning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

11. Sharp Edges Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

12. No Filter Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

13. Filter Rod Modiﬁcation Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . .9

14. Dirt, Rust, orAccumulation Caution

. . . . . . . . . . . . . . . . . . . . . . . .9

ed art

• • • • • • • • • • • • • • •

ULTRAHIGHEFFICIENCY

GASFURNANCE

MODEL 58MVP

VARIABLE-CAPACITY

AND MODEL 58MTA

TWO-STAGE FURNACES

As an ENERGY STAR®

partner, Carrier Corporation

has determined that this

product meets the ENERGY

STAR® guidelines for

energy efficiency.

CERTIFIED

15. Freeze Damage Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7,9

16. Loud Noise Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

17. Antifreeze Caution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

MODELS 58MXA (SHOWN) AND

58MCA 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.

Condensate drain connection. Collects moisture con-

densed from burned gases for disposal into home drain

system. (Location in furnace varies.)

need art

MODELS 58MXA, 58MCA, AND 58MTA

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.

Primaryserpentine 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.

Codelightis for diagnosing furnace operationandservice

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 58MVP

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

identiﬁesthemostserioushazardswhich

will

resultinsevere

personalinjury or death.WARNING signiﬁes hazardswhich

could

result in personal injury or death. CAUTION is used

to identify unsafe practices which

would

result in minor per-

sonal injury or product and property damage. NOTE is used

to highlight suggestions which

will

result in enhanced instal-

lation, reliability or operation.

To minimize the possibility of serious personal injury, ﬁre,

furnace damage, or improper operation;

carefully follow

these safety rules:

•Your gas furnace uses air from outside the home for com-

bustion and vents ﬂue gas to the outdoors. It is not to be

installed using indoor air for combustion. The vent and air-

intake pipes must terminate outside the structure and must

not be obstructed in any way. Do not block or obstruct air

openings on furnace or spaces around the furnace.

• 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.

•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.

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

“BeforeYou Request a Service Call’’section in this manual.

BEFORE STARTING YOUR FURNACE

Examine the furnace installation to determine that:

1. All ﬂue gas carrying areas external to the furnace

(i.e. chimney, vent connector) are clear and free of

obstructions.

2. Theventconnector isinplace,slopesupwardand 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. Therearenoobvioussignsofdeteriorationofthe furnace.

6. The pilot and burner ﬂames are in good adjustment (by

comparison with pictorial sketches or drawings of the

main burner ﬂame and, if applicable, the pilot burner

ﬂame).

WARNING

Fire Hazard! Failure to keep insulation clear of

furnace could result in fire, personal injury/death

or property damage.

WARNING

Do not keep combustible materials, gasoline, and

other flammable liquids or vapors around your

furnace. Failure to follow this warning could result

in fire, personal injury/death or property damage.

WARNING

For proper and safe operation the furnace needs

air for combustion and ventilation. Do not block

or obstruct the openings on the furnace, air

openings to the area in which the furnace is in-

stalled, and the space around the furnace. Failure

to follow this warning could result in fire, personal

injury/death or property damage.

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,

includingneartheﬂoor.Ifyousmellgas,

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 DownYour 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. 8.)

2. Close the external manual gas valve. (See Fig. 9.)

910

3. Turn OFF electrical supply to the furnace. (See Fig. 10.)

4. Remove main furnace door. (See Fig. 11.)

5. Thegasvalvewillhaveacontrolswitchto turn offand on.

Turn the control switch on the gas control to the OFF

position and wait 5 minutes. (See Fig. 12 or 13.) Then

smell for gas, including near the ﬂoor. If you smell gas,

STOP! Follow “B” on furnace label. If you don’t smell

gas, go to next step.

For 58MTA and 58MVP 12

For 58MCA and 58MXA 13

WARNING

If overheating occurs or the gas valve fails to shut

off the gas supply, turn off the manual gas valve to

the furnace BEFORE turning off the electrical sup-

ply. (See Fig. 9.) Failure to follow this warning

could result in a fire or explosion, and personal in-

jury/death or property damage.

A04150

OFF

For 58MTA and 58MVP 14

For 58MCA and 58MXA 15

6. Afterwaiting5 minutes, turn the control switch on the gas

control to the ON position. (See Fig. 14 or 15.)

17 18

7. Replace main furnace door. (See Fig. 16.)

8. Turn ON the electrical supply to the furnace and wait 1

minute. (See Fig. 17.)

9. Open the external manual gas valve. (See Fig. 18.)

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-

ﬁcientcombustionair,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 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.

SomethermostatshaveaFANmodewith2selections:AUTO

and ON. When set on AUTO, the furnace blower cycles on

and off. In the ON mode, the furnace blower runs continu-

ously. Continuous fan keeps the temperature level in your

home more evenly balanced. It also permits the indoor air to

be continuously ﬁltered. ComfortFan™ –On all but the

58MCA, the blower speed can be increased or decreased if

desired due to change of seasons, large gatherings in your

home, etc. Simply change your FAN from ON to OFF for 1

to 3 seconds (or AUTO depending on your thermostat), and

then return to ON. The blower will switch to the next higher

speed. There are at least 3 speeds to choose from. If the

blower is running on its highest speed, a request to change

will direct the blower to return to its lowest speed.

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. 19.)

2. Close the external manual gas valve (See Fig. 9.)

3. Turn off electrical supply to the furnace. (See Fig. 20.)

4. Remove main furnace door. (See Fig. 11.)

5. Turn the switch on the gas control to the OFF position.

(See Fig. 21 or 22.)

A04151

OFF

For 58MTA and 58MVP

For 58MCA and 58MXA

6. Replace the main furnace door. (See Fig. 16.)

7. If the furnace is being shut down because of a malfunc-

tion, call your dealer as soon as possible.

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.

Only trained and qualiﬁed personnel should install, repair, or

serviceheatingequipment.Untrained personnel can perform

basic maintenance functions such as cleaning and replacing

air ﬁlters.

All other operations must be performed by trained and qual-

iﬁedservice agencypersonnel. Observesafetyprecautionsin

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

maycycleonitssafetycontrols. If this conditionisleftunat-

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

ﬁlterhas been installedinanotherlocation, contactyourdeal-

er for instructions. To inspect, clean, and/or replace the air

ﬁlter(s), follow these steps:

1. Turn off electrical supply to furnace. (See Fig. 20.)

2. Remove door/access panel

•AIR FILTERS(S) LOCATED IN BLOWER COMPART-

MENT

a. Remove main furnace door. (See Fig. 23.)

b. Remove blower access panel. (See Fig. 24.)

NOTE:

It will be necessary to remove 2 screws

•AIR FILTER LOCATED IN FILTER CABINET

CAUTION

Furnace is not to be installed, operated, and then

turned off and left turned off in an unoccupied

structure during winter. (See “Heading South for

the Winter” procedures in maintenance section on

page 9). Freeze damage to furnace would occur.

A04150

OFF

WARNING

Turn off electrical power supply to your furnace

before removing the access doors to service or

perform maintenance. A failure to follow this

warning could result in personal injury/death or

property damage.

CAUTION

Although special care has been taken to minimize

sharp edges, be extremely careful when handling

parts or reaching into the furnace. Failure to follow

this caution would result in minor personal injury.

CAUTION

Never operate your furnace without a filter in place.

Doing so may damage the furnace blower motor.

An accumulation of dust and lint on internal parts

of your furnace can cause a loss of efficiency and

would cause minor property or product damage.

a. Remove ﬁlter cabinet door (See Fig. 25 and 26.)

NOTE: It will be necessary to remove 1 thumbscrew

3. Remove air ﬁlter from furnace.

•AIRFILTER LOCATEDINBLOWERCOMPARTMENT

BOTTOM:

a. Slide ﬁlter retainer sideways until it is free of latch. (See

Fig. 27.)

b. Slide air ﬁlter out of furnace. (See Fig. 28.)

•AIR FILTER(S) LOACTED IN BLOWER COMPART-

MENT SIDE:

a. Remove ﬁlter retainer from latch. (See Fig. 29.)

b. Gentlyremove air ﬁlter andcarefullyturn the dirty side up

(if dirty) to avoid spilling dirt from the ﬁlter. (See Fig. 30.)

•AIR FILTER LOCATED IN FILTER CABINET:

a. Slide air ﬁlter out of furnace. Keep dirty side up (if dirty)

to avoid spilling dirt. (See Fig. 31 and 32.)

4. Inspect the ﬁlter. If torn, replace it.

NOTE: If washable ﬁlter that was shipped with the furnace has

been replaced by:

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.

23 24

27 28

29 30

b) Electronic air cleaner (EAC) – Refer to EAC Owner’s

Manual for maintenance information.

5. Ifwashableﬁlter, wash ﬁlter (if dirty) in sink, bathtub,orout-

side with a garden hose.Always use cold tap water.A mild

liquid detergent may be used if necessary. Spray water

throughﬁlterin 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. 33 and 34.) or ﬁlter cabinet door (Fig. 35 and 36.)

9. Turn on electrical supply to furnace.

If your furnace air ﬁlter needs to be replaced, be sure to use a

factory-authorized ﬁlter of the same size that was orginally sup-

plied.Usetheﬁltertablesandcompareyourfurnacesizewiththe

proper ﬁlter size.

31 32

33 34

35 36

*Factory-provided with the furnace. Filters may be ﬁeld modiﬁed by cutting-

ﬁlter material and support rods (3) in ﬁlters. Alternate sizes and additional

ﬁlters may be ordered from your dealer.

†Upﬂow only.

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. 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 fur-

nace can suffer a loss of efﬁciency and perform improperly.

Accumulations on the main burners can result in ﬁring out of

normal sequence. This delayed ignition creates an alarmingly

loud sound.

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. 9, 10, and 11.)

2. Remove burner enclosure front. (See Fig. 37 or 38.)

Inspect the gas burners, igniter area, and remainder of furnace

for dirt, rust, soot, or scale.

3. Inspect the combustion-air and vent PVC pipes for sags,

holes, cracks, or disconnections. Horizontal portions of

pipes must slope downward toward furnace.

37 38

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. 16, 17, and 18.)

6. Start the furnace and observe its operation. Watch the

burner ﬂames to see if they are clear blue, almost transpar-

ent.(See Fig. 36.)Ifyou observeasuspected malfunction,

or the burner ﬂames are not clear blue, call your dealer.

FURNACE AIR FILTERTABLE

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

CAUTION

Use care when cutting support rods in filters to

protect against flying pieces and sharp rod ends.

Wear safety glasses, gloves, and appropriate pro-

tective clothing. Failure to follow this caution

could result in personal injury.

DANGER

If holes are found in the pipes or if any portion has

become disconnected, toxic fumes can escape into

your home. DO NOT OPERATE YOUR FURNACE.

Call your dealer for service. Failure to follow this

warning could result in personal injury or death.

CAUTION

If your furnace makes an especially loud noise

when the main burners light, shut down your fur-

nace and call your dealer. Failure to follow this

caution would result in minor property damage.

CAUTION

If dirt, rust, soot, or scale accumulations are found,

call your dealer. Do not operate your furnace. Failure

to follow this caution would result in minor property

or product damage.

Upflow Downflow

HEADING SOUTH FOR THE WINTER?

DON’T FORGETYOUR FURNACE!

Since the furnace uses a condensing heat exchanger, some water

willaccumulate intheunitasa resultoftheheattransfer 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. 20.)

3. Remove main furnace door. (See Fig. 23.)

4. Remove upper inducer housing drain connection cap.

(See Fig. 40.)

5. Connect ﬁeld-supplied 1/2-in. ID tube to upper inducer

housing drain connection.

6. Insert ﬁeld-supplied funnel into tube.

7. Pour 1 quart of antifreeze into funnel/tube. Antifreeze

should run through inducer housing, overﬁll condensate

trap, and ﬂow into open ﬁeld drain. (See Fig. 41.)

8. Remove funnel and tube from inducer housing and

replace drain connection cap and clamp.

9. Replace main furnace door. (See Fig. 34.)

10. Propylene glycol need not be removed before restarting

furnace.

A CHECK-UP CHECKLIST

Your furnace represents an important investment in your fami-

ly’s comfort and your home’s value. To keep it performing

properly and to prevent future problems, have a trained service

specialist give your furnace a professional check-up annually.

The following checklist can be used as a guideline to proper

service:

• Inspect all ﬂue gas passages, burners, heat exchangers, cou-

pling box(es), and inducer assembly.

•Inspect all combustion-air and vent piping inside structure

and vent pipe termination outside the structure.

•Check gas pipes leading to and inside of 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.

•Inspect and change or clean air ﬁlters(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.

•Inspect electrical wiring, connections, and components for

loose connections.

•Perform an operational checkout to determine whether your

furnace is working properly and if it requires adjustments.

•Inspect all condensate drain tubes and condensate trap assem-

bly for leaks.The condensate removal system should be cleaned

annually by a qualiﬁed service agency. Refer to the Service and

Maintenance Instructions for further information.

•Examine the physical support of the furnace. Support should

be sound with not cracks, sagging, gaps, etc. around the base.

•Check furnace for any obvious signs of deterioration.

BEFORE YOU REQUEST A SERVICE

CALL

If your furnace is not operating or not performing properly,

you may save the expense of a service call by checking a few

things yourself before calling for service.

FOR INSUFFICIENT AIRFLOW:

•Check for dirty air ﬁlter(s).

•Check for blocked return-air or supply-air grilles throughout

your home. Ensure they are open and unobstructed.

If problem still exists, call your dealer for service.

IF FURNACE FAILS TO OPERATE:

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?

CAUTION

If the furnace is installed in an unconditioned space

where the ambient temperatures may be 32°F or

lower, freeze protection measures must be taken to

prevent minor property or product damage.

CAUTION

Do not use ethylene glycol (Prestone II antifreeze

coolant or equivalent). Failure of plastic compo-

nents will occur.

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