ICP 8MPL075B12B1, 8MPN050B12B1, 8MPL050B12B1, 8MPL125J20B1, 8MPN075B12B1 Installation Instructions Manual

80+SingleStage

CategoryI Furnace

N8MPN& N8MPL

*8MPN& *8MPL

* Denotes Brands (C, H, T)

See section 5 for Category [ definition.

SAFETY REQUIREMENTS

Recognize safety information. This is the safety-alert symbolZl._. When you see this symbol on the furnace and in instruction manuals be alert
to the potential for personal injury.

Understand the signal words DANGER, WARNING, or CA UTION. These words are used with the safety-alert symbol. DANGER identifies the
most serious hazards, those that will result in severe personal injury or death. WARNINGsignifiesahazardthatcouldresultinpersonalinjuryor

death. CAUTIONis used to identify unsafe practices that could result in minor personal injury or product and property damage. Note is used to
highlight suggestions that will result in enhanced installation, reliability, or operation.

Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should
install, repair, or service heating equipment.

Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels at-

tached to or shipped with the furnace and other safety precautions that may apply.
Follow all safety codes. In the United States, follow all safety codes including the National Fuel Gas Code (NFGC) ANSI Z223.1-2002/NFPA

54-2002. In Canada, refer to the National Standard of Canada Natural Gas and Propane Installation Code (NSCNGPIC) CSA B149.1-05. Wear
safety glasses and work gloves. Have fire extinguisher available during start-up and adjustment procedures and service calls.

These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these
instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practic-
es. We require these instructions as a minimum for a safe installation.

International Comfort Products, LLC

INSTALLER: Affix these instructions

Lewisburg, TN 37097

on or adjacent to the furnace.
CONSUMER: Retain these

instructions for future reference.

Table of Contents

1. Safe Installation Requirements ................ 3

2. Installation ............................... 4

3. Side Venting .............................. 8

4. Combustion & Ventilation Air ................. 9

5. Gas Vent Installation ....................... 11

6. Horizontal Venting ......................... 13

7. Masonry Chimney Venting ................... 15

8. Gas Supply and Piping ..................... 18

9. ElectricalWiring ............................ 21

10.DuctworkandFilter (Upflow/Horizontal) .......... 22

11.DuctworkandFilter (Downflow) ................ 25

12.ChecksandAdjustments...................... 27

13.FurnaceMaintenance ........................ 32

14.Sequence of Operation& Diagnostics............ 34

TechSupportand Parts.......................... 35

ELECTRIC SHOCK HAZARD
Failure to follow safety warnings

exactly could result in serious

injury and/or death.

Turn Off All Power Before

Servicing.

CARBON MONOXIDE POISONING AND FIRE
HAZARD.

Failure to follow safety warnings exactly could
result in serious injury, death, and/or property
damage.

This furnace is not designed for use in mobile
homes, trailers or recreational vehicles.

Portions of the text and tables are reprinted from NFPA 54 / ANSI Z223,1-2002©, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association,
Washington, DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety,

PrintedinU.S.A. 11/10/2005 441 01 2613 (02)

START-UP CHECK SHEET

(Keep this page for future reference)

Recommended, but not required,

Dealer Name:

Address:

City, State(Province), Zip or Postal Code:

Business Card Here

Phone:
Owner Name:

Address:

City, State(Province), Zip or Postal Code:

Model Number:

Serial Number:

Natural: _1 LP: _1

Type of Gas:

Blower Motor H.P,:

Supply Voltage:

Limit Opens at...(°F) or(°C).
Limit Closes at,,,(°F)___or(°C)

Which blower speed tap is used?
(Heating) (Cooling).

Temperature of Supply Air: (°F)___or(°C)

Temperature of Return Air: (°F) or(°C)__

Rise (Supply Temp.-Return Temp.): (°F) or(°C)__

Filter Type and Size:

Fan "Time ON" Setting:.

Fan "Time OFF" Setting:

Manual Gas Shut-Off Upstream
of Furnace/Drip- Leg?

Drip-Leg Upstream of Gas Valve?

Blower Speed Checked? YES _1

All Electrical Connections Tight?

Gas Valve turned ON? YES _1

YES_I NO_I

YES_I NO_I

NO [_I

YEs_I NO[31

NO[_I

Measured Line Pressure When Firing Unit:

Calculated Firing Rate:(See Checks and Adjustments

Section).

Measured Manifold Pressure:

Thermostat OK? YES _1

Subbase Level? YES _1

Anticipator Set? YES _1

Breaker On? YES _1

Date of Installation:

Date of Start-Up:

NOE_

NOE_I

NO E_ Set At?:

NoE_I

Dealer Comments:

441 01 261302

1. Safe Installation Requirements

FIRE, EXPLOSION, AND ASPHIXIATION HAZARD
Improper adjustment, alteration, service,

maintance or installation could cause death,
personal injury, and/or property damage.

Installation or repairs made by unqualified persons
could result in hazards to you and others.
Installation MUST conform with local codes or, in

the absence of local codes, with codes of all
governmental authorities having jurisdiction.

The information contained in this manual is
intended for use by a qualified service agency that

is experienced in such work, is familiar with all
precautions and safety procedures required in
such work, and is equipped with the proper tools

and test instruments.

• This furnace is not to be used for temporary heating of

buildings or structures under construction.
See "2. Installation, Item 10'_

• This furnace is NOT approved for installation in mo-

bile homes, trailers or recreation vehicles.

• Seal around supply and return air ducts.

• Install correct filter type and size.

• Unit MUST be installed so electrical components are pro-

tected from direct contact with water.

Safety Rules

Your unit is built to provide many years of safe and dependable
service providing it is properly installed and maintained. However,

abuse and/or improper use can shorten the life of the unit and
create hazards for you, the owner.

A. The U.S. Consumer Product Safety Commission encourages

installation of carbon monoxide alarms. There can be various
sources of carbon monoxide in a building or dwelling. The

sources could be gas-fired clothes dryers, gas cooking
stoves, water heaters, furnaces, gas-fired fireplaces, wood
fireplaces.

Carbon monoxide can cause serious bodily injury and/or
death. Carbon monoxide or "CO" is a colorless and odorless

gas produced when fuel is not burned completely or when the
flame does not receive sufficient oxygen.

Therefore, to help alert people of potentially dangerous ca rbon
monoxide levels, you should have a commercially available
carbon monoxide alarm that is listed by a nationally recog-

nized testing agency in accordance with Underwriters Labora-
tories Inc. Standard for Single and Multiple Station Carbon

Monoxide Alarms, ANSI/UL 2034 or the CSA 6.19-01 Resi-
dential Carbon Alarming Devices installed and maintained in

the building or dwelling concurrently with the gas- fired furnace
installation (see Note below). The alarm should be installed as

recommended by the alarm manufacturer's installation in-
structions.

B. There can be numerous sources of fire or smoke in a building

or dwelling. Fire or smoke can cause serious bodily injury,
death, and/or property damage. Therefore, in order to alert
people of potentially da ngerous fire or smoke, you should have

fire extinguisher and smoke alarms listed by Underwriters Lab-
oratories installed and maintained in the building or dwelling

(see Note below).

Note: The manufacturer of your furnace does not test any alarms

and makes no representations regarding any brand or type
of alarms.

NOTE: This furnace is design-certified by the CSA International
(formerly AGA and CGA) for installation in the United States and
Canada. Refer to the appropriate codes, along with this manual,
for proper installation.

Use only the Type of gas approved for this furnace (see
Rating Plate on unit). Overfiring will result in failure of heat
exchanger and cause dangerous operation. (Furnaces
can be converted to LP gas with approved kit.)

• Install this furnace only in a location and position as speci-
fied in "2. Installation"of these instructions.

• Provide adequate combustion and ventilation air to the fur-
nace as specified in "4. Combustion and Ventilation Air" of

these instructions.
Combustion products must be discharged outdoors. Con-

nect this furnace to an approved vent system only, as spe-
cified in "5. Gas Vent lnstallation, 6. Horizontal Venting and

7. Masonry Chimney Venting"of these instructions.

Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
"8. Gas Supply and Piping, Final Check"of these instruc-

tions.
Always install furnace to operate within the furnace's in-

tended temperature-rise range with a duct system which
has an external static pressure within the allowable range,
as specified in "Technical Support Manual" of these in-
structions. See furnace rating plate.

• When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space con-

taining the furnace, the return air shall also be handled by a
duct(s) sealed to the furnace casing and terminating out-
side the space containing the furnace.

• A gas-fired furnace for installation in a residential garage
must be installed as specified in "2. Installation"of these

instructions.

C. To ensure safe and efficient operation of your unit, you should

do the following:

1. Thoroughly read this manual and labels on the unit. This
will help you understand how your unit operates and the haz-
ards involved with gas and electricity.

2. Do not use this unit if any part has been under water. Im-
mediately call a qualified service agency to inspect the unit and
to replace any part of the control system and any gas control

which has been under water.

3. Never obstruct the vent grilles, or any ducts that provide
air to the unit. Air must be provided for proper combustion and
ventilation of flue gases.

441 01 2613 02 [_

Frozen Water Pipe Hazard Ifyourfurnace remains off for an extended time, the pipes in your

home could freeze and burst, resulting in serious water damage.

FROZEN AND BURST WATER PIPE HAZARD

Failure to protect against the risk of freezing could

result in property damage.
Do not leave your home unattended for long periods

during freezing weather without turning off water
supply and draining water pipes or otherwise

)rotecting against the risk of frozen pipes and

resultant damage.

Your furnace is designed solely to provide a safe and comfortable
living environment. The furnace is NOT designed to ensure that

water pipes will not freeze. It is equipped with several safety de-
vices that are designed to turn the furnace off and prevent it from

restarting in the event of various potentially unsafe conditions.

If the structure will be unattended during cold weather you should
take these precautions.

Turn off the water supply to the structure and drain the water
lines if possible and add an antifreeze for potable water to
drain traps and toilet tanks. Open faucets in appropriate

areas.

-or-

Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a service agency to call to
provide service, if required.

-or-

3. Install a reliable remote sensing device that will notify some-
body of freezing conditions within the home.

2. Installation

CARBON MONOXIDE POISONING HAZARD.

Failure to properly vent this furnace or other
appliances could result in death or personal injury.

If this furnace is replacing a previously common-
vented furnace, it may be necessary to resize the

existing vent system to prevent oversizing
problems for the other remaining appliances(s).
See Venting and Combustion Air Check in the 5. Gas

Vent Installation section of this instruction.

Location and Clearances

If furnace is a replacement, it is usually best to install the furnace
where the old one was. Choose the location or evaluate the exist-

ing location based upon the minimum clearance and furnace di-
mensions (Figure 1 or Figure 2).

CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warnings could result in

death or personal injury.
Do NOT operate furnace in a corrosive

atmosphere containing chlorine, fluorine or any
other damaging chemicals which could harm the
furnace and vent system, and permit spillage of

combustion products into an occupied space.
Refer to 4. Combustion & Ventilation Air section,

Contaminated Combustion Air for combustion air
evaluation and remedy.

Installation Requirements

1. Install furnace level.

2. This furnace is NOT to be used for temporary heat of buildings
or structures under construction.

3. Install furnace as centralized as practical with respect to the
heat distribution system.

4. Install the vent pipes as short as practical. (See 5. Gas Vent
Installation section).

5. Do NOT install furnace directly on carpeting, tile or other com-
bustible material other than wood flooring.

6. Maintain clearance for fire safety and servicing. A front clear-
ance of 24" is minimum for access to the burner, controls and

filter. See clearance requirements in Figure 1 or Figure 2.

7. Use a raised base if the floor is damp or wet at times.

8. Residential garage installations require:

• Burners and ignition sources installed at least 18" (457
mm) above the floor.

• Furnace must be located or physically protected from
possible damage by a vehicle.

If the furnace is to be suspended from the floor joists in a base-
ment or a crawl space or the rafters in an attic, it is necessary to
use steel pipe straps or an angle iron frame to attach the fur-

nace. These straps should be attached to the furnace bottom
side with sheet metal screws and to the rafters or joists with
bolts. The preferred method is to use an angle iron frame
bolted to the rafters or joists.

10. This furnace may be used for construction heat provided that:

• The furnace is permanently installed with all electrical
wiring, piping, venting and ducting installed according to
these installation instructions. A return air duct is pro-
vided, sealed to the furnace casing, and terminated out-
side the space containing the furnace. This prevents a
negative pressure condition as created by the circulating

air blower, causing a flame rollout and/or drawing com-
bustion products into the structure.

• The furnace is controlled by a thermostat. It may not be
"hot wired" to provide heat continuously to the structure

without thermostatic control.

• Clean outside air is provided for combustion. This is to
minimize the corrosive effects of adhesives, sealers and

other construction materials. It also prevents the entrain-
ment of drywall dust into combustion air, which ca n ca use
fouling and plugging of furnace components.

• The temperature of the return air to the furnace is main-
tained between 55 ° F (13 ° C) and 80 ° F (27° C), with no

evening setback or shutdown. The use of the furnace
while the structure is under construction is deemed to be

intermittent operation per our installation instructions.

441 01 261302

The air temperature rise is within the rated rise range on
the furnace rating plate, and the firing rate has been setto

the rating plate value.

The filters used to clean the circulating air during the
construction process must be either changed or thor-
oughly cleaned prior to occupancy.

• The furnace, ductwork and filters are cleaned as neces-
sary to remove drywall dust and construction debris from

all HVAC system components after construction is com-
pleted.

• Verify proper furnace operating conditions including igni-
tion, gas input rate, air temperature rise, and venting ac-
cording to these installation instructions.

Dimensions and Clearances (N8MPN/L)

LEFT SIDE

21/4

• Plugged starting
hole to cut side

13114_1_o_ '°pening

17/8 _ 21314

I 265/8

61/2

_-,__-- 33/4

I 47/8 11/2

"24" Min.

A

-- B--

FRONT

®

C__ BOTTOM

Drawing is representative, but some models may vary

I_ 41116

DIMENSIONS IN INCHES

DIMENSIONAL INFORMATION

Furnace Cabinet Bottom

Model A B C D

N8MPN/L05OB12 151/2 13/8 125i8
NSMPN/L075B12 14

N8MPN/LO75F16

N8MPN100F14 19118 175/8 21/8 143/4

N8MPN/L1OOF20

N8MPN/L1OOJ22
N8MPN/L125J20 22314 21114 115116 183/4

NSMPN/L125J22

ReturnAir

Opening

MINIMUM CLEARANCES TO COMBUSTIBLE

MATERIALS FOR ALL FURNACES

REAR 0
FRONT (combustion air openings 3"

in furnace and structure)

Required For Service *24"

ALL SIDES Of SUPPLY PLENUM 1"
SIDES 0
VENT

Single-Wall Vent 6"
Type B-1 Double-Wall Vent 1"

TOP OF FURNACE 1"

"30" clearancerecommendedfor furnaceremovaL

Horizontalposition:Linecontactispermissibleonlybetweenlines

formedby intersectionsof topandtwo sidesof furnacejacket, and
buildingjoists, studsor framing.

I 281/2 --

-- 33/4 I,,_ I 18112-

2

F-_

/1 RIGHT SIDE

1_ 13t/4/

11124,10 213,4

265/8

Plugged starting holetocut

sideductopening

NOTE: Evaporator "A" coil drain pan dimensions may vary
from furnace duct opening size. Always consult evaporator
specifications for duct size requirements.

Furnace is designed for bottom return or side return.

Return air through back of furnace is NOT allowed.

25-23-44al

441 O1 261302 [_

Dimensions and Clearances (*8MPN/L Models)

TOP

LEFT SIDE

• Plugged starting
I hole to cut side

131/4 _¢t opening

21814

17/8/ 26518

5113

5f__ _ _1

-- 3314

7/8

1

47/ 11/2

_E

"24"Min.

--A_

-- B --

38 FRONT

®

MINIMUM CLEARANCES TO COMBUSTIBLE

MATERIALS FOR ALL UNITS

REAR 0
FRONT (combustion air openings 3"

in furnace and structure)

Required For Service *24"

ALL SIDES Of SUPPLY PLENUM 1"
SIDES 0
VENT

Single-Wall Vent 6"
Type B-1 Double Wall Vent 1"

TOP OF FURNACE 1"

"30" clearancerecommendedfor furnaceremoval.

Horizontalposition:Linecontactispermissibleonlybetweenlines

formedby intersectionsof topandtwo sidesof furnacejacket, and
buildingjoists, studsor framing.

28112

RIGHT SIDE

2--

L 1

37

/41I

29,1121

3_

11751

Drawing is representative some models may vary

I_ 41116

DIMENSIONS IN INCHES

J

H

13114

DIMENSIONAL INFORMATION

Furnace I Cabinet I Top Bottom I ReturnAir

Mode, I;I 2 _4 F C D I Opening

*8MPN/LOSOB12 6 1318 12518 H
*8MPN/LO75B12

*8MPN/L075F16

*8MPN100F14 1911817518 73/4 21/8 14314I J

*8MPN/L10OF20

I

*8MPN/LIOOJ20

*8MPN/L125J208MPN150J20223/4211/4 91/2 115116 183/4 J

* Denotes Brand

11/2

L

47/8 l 13/4

265/_

NOTE: Evaporator "A" coil drain pan dimensions may
vary from furnace duct opening size. Always consult
evaporator specifications for duct size requirements.

Furnace is designed for bottom return or side return.

Return air through back of furnace is NOT allowed.

T

17/8

40

Plugged starting hole to
cut side duct opening

Installation Positions

This furnace can be installed in an upflow, horizontal (either left or
right) or downflow airflow position. DO NOT install this furnace on

its back. For the upflow position, the return air ductwork can be at-
tached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must be

attached to the bottom. The return air ductwork must never be at-
tached to the back of the furnace.

Furnace Installation

Inspect the rating plate to be certain the model number begins with
"N8MP" or "*8MP". This identifies the unit as a multi-position fur-

nace and can be Installed in a Upflow, Horizontal Right, Horizontal
Left or Downflow position.

Dentoes Brand (C, H, T)

Upflow

No modifications are required for upflow installation. (See
Figure 3)

441 O1 261302

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SUPPLY

AIR

RETURN N

GAS SUPPLY

25-23-17

Horizontal

If you purchased a multi-position furnace, it can be installed hori-
zontally in an attic, basement, crawl space, alcove, or suspended

from a ceiling in a basement or utility room in either a right or left
airflow position. (see Figure 4)

Horizontally installed furnaces may be vented out the top of the
unit or out the side facing up. See"Side venting" for instructions to

rotate the vent to the side.
The minimum clearances to combustibles MUST be maintained

between the furnace and adjacent construction, as shown in
Figure 1 and Figure 2. ONLY the corner of the cabinet is allowed

to contact the rafters as shown in Figure 4. All other clearances
MUST be observed as shown in Figure 1 and Figure 2.

Typical Horizontal Installation

GAS SUPPLY

SUPPLY

OPTIONAL
VENT LOCATION

25- 23-18a

The horizontal furnaces may be installed directly on combustible
wood flooring or supports, however, it is recommended for further

fire protection cement board or sheet metal is placed between the
furnace and the combustible wood floor and extend 12" beyond
the front of the furnace louver door. (This is a recommendation

only, not a requirement).
This furnace MUST NOT be installed directly on carpeting, tile or

other combustible material other than wood flooring or supports.

Downflow

FIRE HAZARD.
Failure to install unit on noncombustible subbase

could result in death, personal injury and/or property

damage.
Place furnace on noncombustible subbase on

downflow applications, unless installing on
noncombustible flooring.

If you purchased a Multi-position furnace (N8MP or *8MP) it may
be installed in a downflow configuration, (see Figure 5). The mini-

mum clearances to combustion construction MUST be maintained
between the furnace and adjacent construction, as shown in
Figure 1 and Figure 2.

In addition to clearances in Figure 1 and Figure 2, clearance for
the vent pipe must be considered.

A subbase for combustible floors MUST be used when the furnace
is installed as a downflow on combustible material. See 11. "Duct-

work and Filter" (Downflow Section). The outlet flange must be

bent flat for downflow installation.
When installing a four-position furnace in the downflow position

(not the *8DNL furnace), the logo is to be repositioned so that it is
rightside-up as follows:

T8MPN/L

1. Find the door hardware kit that is stored in the furnace and
save it.

2. Carefully remove logo from the outside of burner compartment
door and save it.

If the furnace is to be suspended from the floor joists in a basement
or crawl space or the rafters in an attic, it is necessary to use steel

pipe straps or an angle iron frame to attach the furnace. These
straps should be attached to the furnace bottom side with sheet

metal screws and to the rafters or joists with bolts. The preferred
method is to use an angle iron frame bolted to the rafters or joists.

If the furnace is to be installed at ground level in a crawl space, con-
sult local codes. A concrete pad 1" to 2" thick is recommended.

3. Carefully remove two small plug buttons from outside of blow-
er compartment door and save them.

4. Remove two thumbscrews from blower compartment door.

5. Install two thumbscrews in holes at other end of blower
compartment door from where thumbscrews were removed.

6. Install new strip of rubber gasket on inside of blower compart-
ment door on edge that does not already have a gasket.

7. Install logo retainer pins into holes in blower compartment door
from which plug buttons were removed.

8. Install plug buttons into holes in burner compartment door from
which logo was removed.

9. Install blower compartment door on furnace with bevel edge
and logo at top.

10. Install burner compartment door on furnace with bevel edge at
bottom.

Twenty four inches (24") is required between the front of the fur-
nace and adjacent construction or other appliances. This should

be maintained for service clearance.

N8MPN/L, C81VlPN/L, H8MPN/L
1, Carefully remove logo from burner compartment door and

save it.

Keep all insulating materials clear from Iouvered door. Insulating
materials may be combustible.

441 01 2613 02

2. Turn the logo rightside-up, and install the logo retainer pins
into holes in burner compartment door.

3. Newlabelsforrightside-upapplicationonoutsideofblower
compartmentdoormaybepurchasedinakitfromyourdistrib-
utortocoverupside-downlabels.

DownflowVenting:ThecombustionventerMUSTberotatedto
ventoutthesideforalldownflowinstallations,(seeFigure5).Bot-
tomventingisnotpermitted.See"Sideventing"forinstructionsto

rotatetheventtotheside.Inadditiontorotatingtheventtotheside
aVentPipeShield(NAHAOO2VC)isrequiredtoshieldthehot
ventpipe.

BURN HAZARD.
Vent pipe is HOT and could cause personal injury.

Hot vent pipe is in reach of small children when
installed in downflow position.

Install vent pipe shield NAHA002VC.

Pressure Switch Relocation

If the furnace is installed in the u pflow position, the pressure switch
will remain in the same position as installed by the factory unless

the inducer is rotated. If the furnace is installed in an orientation
that places the pressure switch below the pressure tap on the in-

ducer housing, then the switch MUST be relocated. In order to re-
locate the switch, locate 2 mounting holes or drill above the inducer
pressure tap. When drilling the 2 holes make sure to keep the
switch and tubing far enough away from the burners or hot sur-

faces as to not melt the hose, switch, or wires. To prevent possible

3. Side Venting

This furnace is shipped from the factory with the venter assembly
in an upflow configurations (top vent). The venter assembly can

easily be rotated to a side vent configurations for use in upflow,
horizontal-flow, or downflow application.

When using a side vent configuration (side outlet instead of top
outlet), it may be necessary to relocate the pressure switch to the
alternate position on the opposite side of the top panel. Two screw

holes are provided at the alternate position. Route the pressure
switch tubing so the tubing is not kinked and not touching the hot
collector box, venter housing, or motor. It may be necessary to

shorten the length of the tubing to properly route the tubing and
eliminate kinks.

Rotating the Venter Assembly

1,

2,

3,

4,

5.

6.

If gas and electrical power have already been connected to
unit shut off gas and remove power from unit. Unscrew screws
on burner compartment door and remove burner compartment

door. (see Figure 6).

Disconnect power leads to the venter motor and hose to pres-
sure switch. Remove three (3) or four (4) screws which secure

the venter to the collector box, (see Figure 7).

Cut webbing with a pair of snips holding the vent plate to the
cabinet on either the left or right side of unit depending on right

or left venting as desired. Discard vent plate, (see Figure 6).

Replace venter gasket (part # 1013540, if needed) to venter
assembly with adhesive in the same location as the old one.

Clip the wire tie for the venter wires, if needed.

Rotate venter assembly 90 ° right or left from original location
depending on venting configurations.

kinking of the pressure switch hose, trim the hose to remove ex-
cess length.

Note: When drilling new holes make sure metal shavings do not fall
on or in components, as this can shorten the life of the furnace.

Typical Downflow Installation

RETURN

AIR

See side venting

Combustible floor

base outlet flange

adapter

Vent Shield

Kit MUST BE OPPOSITE

VENT DISCHARGE
SIDE

SUPPLY

AIR 25-23-19

Furnace with Screws

Venter Gasket

Main Line Entry

Screws (2)

25-23-45

25-23-52c 25-23-52b

441 01 2613 02

7. Tighten the three (3) or four (4) screws that secure the venter
assembly to the collector box. Do tighten screws enough to

compress venter gasket.

8. Replace power leads to venter motor and reconnect hose to
pressure switch.

NOTE: Unused open vent hole must be covered. A Vent Cover is
supplied with Vent Pipe Shield Kit NAHAOO2VC. A 55/16" diameter

Vent Cover is available separately from your distributor, or one can
be fabricated with sheet metal for all side vent installations.

4. Combustion & Ventilation Air

CARBON MONOXIDE POISONING HAZARD.

Failure to provide adequate combustion and

ventilation air could result in death or personal

injury.
Use methods described here to provide

combustion and ventilation air.

• Cleaning solvents (such as perchloroethylene).

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid.

• Sulfuric Acid.

• Solvent cements and glues.

• Antistatic fabric softeners for clothes dryers.

• Masonry acid washing materials.

Outdoor Combustion Air Method

Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-

ings for supplying combustion and ventilation air must comply with
the gas codes, or in the absence of local codes, the applicable na-

tional codes.

Combustion and ventilation air must be supplied in accordance
with one of the following:

1. Section 8.3, Air for Combustion and Ventilation, of the National
Fuel Gas Code, (NFGC), ANSI Z223.1-2002/NFPA 54-2002

in the U.S.,

2. Sections 7.2, 7.3, 7.5, 7.6, 7.7, and 7.8 of National Standard of
Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1-05 in Canada,

3. Applicable provisions of the local building code.

When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting

And Combustion Air Check in %. Gas Vent Installation "Section in
this manual.

A space having less than 50 cubic feet per 1,000 BTUH input rating
for all gas appliances installed in the space requires outdoor air for

combustion and ventilation.

Air Openings andConnecting Ducts

1. Total input rating for all gas appliances in the space MUST be
considered when determining free area of openings.

2. Connect ducts or openings directly to the outdoors.

3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4" mesh.

4. The minimum dimension of air ducts MUST NOT be less than

3 '_ .

When sizing a grille, louver or screen use the free area of open-
ing. If free area is NOT stamped or marked on grill or louver,

assume a 20% free area for wood and 60% for metal. Screens
shall have a mesh size not smaller than 1/4".

Requirements

1. Provide the space with sufficient air for proper combustion and

Contaminated Combustion Air

Installations in certain areas or types of structures could cause ex-
cessive exposure to contaminated air having chemicals or halo-

gens that will result in safety and performance related problems
and may harm the furnace. These instances must use only out-

door air for combustion.

The following areas or types of structures may contain or have ex-
posure to the substances listed below. The installation must be

evaluated carefully as it may be necessary to provide outdoor air
for combustion.

• Commercial buildings.

• Buildings with indoor pools.

• Furnaces installed in laundry rooms.

• Furnaces installed in hobby or craft rooms.

• Furnaces installed near chemical storage areas.

• Permanent wave solutions for hair.

• Chlorinated waxes and cleaners.

• Chlorine based swimming pool chemicals.

• Water softening chemicals.

• De-icing salts or chemicals.

• Carbon tetrachloride.

• Halo_erants.

441 01 2613 02

ventilation of flue gases using horizontal or vertical ducts or
openings.

Figure 8 illustrates how to provide combustion and ventilation
air when two permanent openings, one inlet and one outlet, are
used.

a. One opening MUST commence within 12" of the floor

and the second opening MUST commence within 12" of
the ceiling.

b. Size openings and ducts per Table 1.
c. Horizontal duct openings require 1 square inch of free

2

area per 2,000 BTUH (1,100 mm /kW) of combined input
for all gas appliances in the space (see Table 1).

d. Vertical duct openings or openings directly communicat-

ing with the outdoors require 1 square inch of free area

2

per 4,000 BTUH (550 mm /kW) for combined input of all
gas appliances in the space (see Table 1).

When one permanent outdoor opening is used, the opening
requires:

a. 1 sq. in of free area per 3,000 BTUH (700 mm2/kW) for

combined input of all gas appliances in the space (see
Table 1) and

b. not less than the sum of the areas of all vent connectors in

the _space.

G3

Outside Air (This is ONLY a guide. SubJect to codes of country having jurisdiction.)

ThisinstallationNOTapprovedinCanada

GasVent

, GableV_/)

(1)

Soffit Vent

Inlet

Air(1)

MinimumOne Inlet and OneOutlet AirSupply is Required

May be in andCombination Shown

Inlet Air Opening Must beWithin12"(300mm)offloor
OutletAir OpeningMustbeWithin12"(300mm)ofceiling

(1) 1 SquareInch (6cm2) per4000 BTUH
(2) 1 Square Inch(6cm2) per2000 BTUH

G Vent _j_.Gable

Vent

ba_ventilated Attic'_

I Top Above Insulation_

I 1 €_:;;_l TM

I/ SoffitVen,

I_ utletAir(1) Outlet/1_
II _. Air(1)

F...... NG_

_,, _ r-_ Inlet

-- Air (2) Inlet

Air (1)

........ Air(2)

The opening shall commence within 12" of the top of the enclo- b.
sure. Appliances shall have clearances of at least 1" from the sides

and back and 6" from the front. The opening shall directly commu- c.
nicate with the outdoors or shall communicate through a vertical or

horizontal duct to the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.

4. Combination of Indoor and Outdoor Air shall have:

a. Indoor openings that comply with the Indoor Combus-

tion Air Method below and

Outdoor openings located as required in the Outdoor
Combustion air Method above and

Outdoor openings sized as follows.

1) Calculate the Ratio of all Indoor Space volume divid-
ed by required volume for Indoor Combustion Air Meth-
od. Outdoor openings sized as follows.

2) Outdoor opening size reduction Factor is I minus the
Ratio in 1) above.

3) Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
multiplied by reduction Factor.

FreeArea

BTUH MinimumFree Area Required for EachOpeningor Ductto Outdoors

Input TwoHorizontalDucts SingleOpening TwoVerticalDuctsor Openings RoundDuct

Rating (sq.inJ2,000 BTUH) (sq. in./3,000BTUH) (sq.inJ4,000BTUH) (sq. in./4,000

BTUH)

50,000 25 sq, in. 16.7sq. in. 12,5sq. in. 4"
75,000 37,5sq. in. 25 sq, in, 18.75sq. in. 5"

100,000 50sq. in. 33.3sq. in. 25 sq. in, 6"
125,000 62,50 sq. in. 41,7sq. in. 31.25sq, in. 7"

150,000 75 sq, in. 50 sq, in, 37,5 sq. in. 7"

EXAMPLE: Determining Free Area

Furnace Water Heater Total Input
100,000 + 30,000 (130,000 + 4,000) 32.5 Sq. In. Vertical

Furnace Water Heater Total Input
100,000 + 30,000 (130,000 + 2,000) 65 Sq. In. Horizontal

Indoor Combustion Air

Standard and Known-Air-Infiltration Rate Methods

© NFPA & AGA

Indoor air is permitted for combustion and ventilation, if the
Standard or Known-air-lnfiltration Rate Method is used,

CARBON MONOXIDE POISONING HAZARD.
Failure to supply adequate combustion air could

result in death or personal injury.
Most homes will require additional air from outdoors

for combustion and ventilation. A space with at least
50 cubic feet per 1,OOOBTUH input rating or homes

with tight construction may need outdoor air to

supplement air infiltration for proper combustion
and ventilation of flue gases.

441 O1 261302

The Standard Method may be used, if the space has no less vol-
ume than 50 cubic feet per 1,000 BTUH of the maximum input rat-

ings for all gas appliances installed in the space. The standard
method permits indoor air to be used for combustion and ventila-

tion air.
The Known Air Infiltration Rate Method shall be used if the in-

filtration rate is known to be less than 0.40 air changes per hour

MINIMUMSPACEVOLUMEFOR100%COMBUSTION

OtherThan Fan-Assisted Total

.............................................................. (1,OOO'sBtuh)

(ACH) and equal to or greater than 0.10 ACH. Infiltration rates
greater than 0.60 ACH shall not be used. The minimum required

volume of the space varies with the number of ACH and shall be
determined per Table 2 or Equations 1 and 2. Determine the
minimum required volume for each appliance in the space, and
add the volumes together to get the total minimum required vol-
ume for the space.

ANDVENTILATIONAIRFROMINDOORS(ft 3)

Fan-assistedTotal

(1,000'sBtuh)

ACH

0.60

0.50

0.40

0.30

0.20

0.10

0.00

30

1,050
1,260

1,575
2,100

3,150

6,300

NP

40

1,400
1,680

2,100
2,800

4,200
8,400

NP

50

1,750
2,100

2,625
3,500

5,250

10,500

NP

50

1,250
1,500

1,875
2,500

3,750

7,500

NP

75 I

1,875
2,250

2,813
3,750

5,625

11,250

NP

100

2,500
3,000

3,750
5,000

7,500

15,000

NP

125 I 180

3,125 3,750
3,750 4,500

4,688 5,625
6,250 7,500

9,375 11,250

18250 22,500

NP NP

NP = Not Permitted
Table 2 Minimum Space Volumes were determined by using the

following equations from the National Fuel Gas Code ANSI
Z223.1/NFPA 54-2002, 8.3.3.2:

1. For other than fan-assisted appliances such as a draft
hood-equipped water heater,

21 ft3 ( I other )

Volume other = ACH 1000 Btu / hr

2. For fan-assisted appliances such as this furnace,

15ft3 ( Iran )

Volume fan = ACH 1000 Btu / hr

main open and NOT have any means of being closed off. Ven-
tilation openings to outdoors MUST be at least 1 square inch

of free area per 4,000 BTUH of total input rating for all gas ap-
pliances in the space.

In spaces that use the Indoor Combustion Air Method, in-
filtration should be adequate to provide air for combustion,
ventilation and dilution of flue gases. However, in buildings

with unusually tight construction, additional air MUST be pro-

vided using the methods described in section titled Outdoor

Combustion Air Method:

Unusually tight construction is defined as Construction with:

1. Walls and ceilings exposed to the outdoors have a con-
tinuous, sealed vapor barrier. Openings are gasketed or

sealed and

If:

[ other= combined input of all other than fan-assisted

appliances in Btu/hr

[fan = combined input of all fan-assisted appliances in Btu/hr

ACH = air changes per hour (ACH shall not exceed 0.60.)

The following requirements apply to the Standard Method and to
the Known Air Infiltration Rate Method.

• Adjoining rooms can be considered part of a space, if there
are no closable doors between rooms.

• An attic or crawl space may be considered a space that freely
communicates with the outdoors provided there are adequate

ventilation openings directly to outdoors. Openings MUST re-

2. Doors and openable windows are weather stripped and

3. Other openings are caulked or sealed. These include
joints around window and door frames, between sole

plates and floors, between wall-ceiling joints, between
wall panels, at penetrations for plumbing, electrical and
gas lines, etc.

Ventilation Air

Some provincial codes and local municipalities require ventilation
or make-up air be brought into the conditioned space as replace-

ment air. Whichever method is used, the mixed return air tempera-
ture across the heat exchanger MUST not fall below 60 °
continuously, or 55 ° on an intermittent basis so that flue gases will

not condense excessively in the heat exchanger. Excessive con-
densation will shorten the life of the heat exchanger and possibly
void your warranty.

5. Gas Vent Installation

CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.

Failure to properly vent this furnace could result in
death, personal injury and/or property damage.

Read and follow all instructions in this section.

Install the vent in compliance with codes of the country having ju-
risdiction, local codes or ordinances and these instructions.

441 O1 2613 02

This Category [ furnace is fan-assisted.

Category ] furnace definition: A central furnace which operates
with a non-positive vent static pressure and with a flue loss not
less than 17 percent. These furnaces are approved for common-

venting and multi-story venting with other fan-assisted or draft
hood-equipped appliances in accordance with the NFGC or

NSCNGPIC

Category I Safe Venting Requirements

Category ] furnace vent installations shall be in accordance with
Parts 10 and 13 of the National Fuel Gas Code (NFGC), ANSI

Z223.1-2002/NFPA54-2002;and/orSection7andAppendixCof
theCSAB149.1-05,NationalStandardofCanada,NaturalGas

andPropaneInstallationCode;thelocalbuildingcodes;furnace
andventmanufacturer'sinstructions.

NOTE: The following instructions comply with the ANSI
Z223.1/NFPA 54 National Fuel Gas Code and CSA B149.1 Natu-

ral Gas and Propane Installation code, based on the input rate on
the furnace rating plate.

1,

If a Category ] vent passes through an attic, any concealed
space or floor, use ONLY Type B or Type L double wall vent
pipe. If vent pipe passes through interior wall, use Type B vent
pipe with ventilated thimble ONLY.

2. Do NOT vent furnace into any chimney serving an open fire-
place or solid fuel burning appliance.

3. Use the same diameter Category ] connector or pipe as per-
mitted by:

the National Fuel Gas Code Code (NFGC) ANSI
Z223.1-2002 / NFPA 54-2002 sections 10 and 13 vent-

ing requirements in the United States

or

the National Standard of Canada Natural Gas and Pro-
pane Installation Code (NSCNGPIC) CSA B149.1-05

section 7 and appendix C venting requirements in Cana-
da.

4, Push the vent connector onto the furnace flue collar of the

venter assembly until it touches the bead (at least 5/8" overlap)
and fasten with at least two field-supplied, corrosion-resist-

ant, sheet metal screws located at least 140 ° apart.

5. Keep vertical Category [ vent pipe or vent connector runs as
short and direct as possible.

6. Vertical outdoor runs of Type-B or ANY single wall vent pipe
below the roof line are NOT permitted.

7. Slopeallhorizontalrunsupfromfurnacetotheventterminal a
minimum of 1/4" per foot (21 mm/m).

8. Rigidly support all horizontal portions of theventing system ev-
ery 6' or less using proper clamps and metal straps to prevent

sagging and ensure there is no movement after installation.

9. Check existing gas vent or chimney to ensure they meet clear-
ances and local codes. See Figure 1

10. The furnace MUST be connected to a factory built chimney or
vent complying with a recognized standard, or a masonry or
concrete chimney lined with a lining material acceptable to the
authority having jurisdiction. Venting into an unlined ma-
sonry chimney or concrete chimney is prohibited. See the

6. Masonry Chimney Venting section in these instruc-
tions.

11. Fan-assisted combustion system Category ] furnaces shall
not be vented into single-wall metal vents.

12. Category ] furnaces must be vented vertically or nearly verti-
cally, unless equipped with a listed mechanical venter.

13. Vent connectors serving Category I furnaces shall not be con-
nected into any portion of mechanical draft systems operating
under positive pressure.

Venting and Combustion Air Check

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each

appliance connected to the venting system being placed

into operation, could result in carbon monoxide
poisoning or death:

The following steps shall be followed for each appliance
connected to the venting system being placed into

operation, while all other appliances connected to the
venting system are not in operation:

1.Seal any unused openings in the venting system.

2.Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI

Z223,1/NFPA 54 or CSA B149.1, Natural Gas and
Propane Installation Code and these instructions. Deter-

mine that there is no blockage or restriction, leakage, cor-
rosion and other deficiencies which could cause an unsafe

condition.

3.As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)

connected to the venting system are located and other
spaces of the building.

4.Close fireplace dampers.

5.Turn on clothes dryers and any appliance not connected to

the venting system. Turn on any exhaust fans, such as

range hoods and bathroom exhausts, so they are
operating at maximum speed. Do not operate a summer

exhaust fan.

6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust the thermostat so
appliance is operating continuously.

7.Test for spillage from draft hood equipped appliances at

the draft hood relief opening after 5 minutes of main burner

operation. Use the flame of a match or candle. (Figure 9)

8.If improper venting is observed, during any of the above

tests, the venting system must be corrected in accordance
with the National Fuel Gas Code, ANSI Z223,1/NFPA 54

and/or CSA B149, 1, Natural Gas and Propane Installation

Code.

9.After it has been determined that each appliance con-
nected to the venting system properly vents when tested

as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas-fired burning

appliance to their previous conditions of use.

Vent Check

Vent Pipe _1 I A/ Draft Hood

Typical Gas
Water Heater

!

II d dft hoJd

NOTE: If fame pu s towar s ra , this indicates
sufficient infiltration air.

NOTE: When an existing Category I furnace is removed or re-
placed, the original venting system may no longer be sized to prop-

erly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOL-

LOWING CHECK.

/2N

Venting to Existing Masonry Chimney

Dedicated venting of one fan assisted furnace into any ma-
sonry chimney is restricted. A chimney must first be lined with
either Type B vent sized in accordance with NFGC tables 13.1 or

441 01 261302

13.2 or a listed, metal lining system. (See Section 7 Masonry
Chimney Venting of these instructions.)

Listed, corrugated metallic chimney liner systems in masonry
chimneys shall be sized by using NFGC tables per 13.1.7 for dedi-
cated venting and per 13.2.19 for common venting with the maxi-
mum capacity reduced by 20% (0.80 X maximum capacity) and

the minimum capacity as shown in the applicable table. In Canada,
use the NSCNGPIC, appendix C, section 10. Corrugated metal

vent systems installed with bends or offsets require additional re-
duction of 5% of the vent capacity for each bend up to 45° and 10%
of the vent capacity for each bend from 45 ° up to 90 ° .

NOTE: Two (2) 45° elbows are equivalent to one (1) 90° elbow.

Combined Venting into a Masonry Chimney

Venting into a masonry or concrete chimney is only permitted
as outlined in the NFGC or NSCNGPIC venting tables. Follow

all safe venting requirements.

Note: See section "7. Masonry Chimney Venting".

6. Horizontal Venting

Category I Furnaces With External Power
Venters

In order to maintain a Category ] classification of fan-assisted fur-
naces when vented horizontally with sidewall termination, a power
venter is REQUIRED to maintain a negative pressure in the vent-
ing system.

In the U.S.: Per the NFGC, a listed power venter may be used,
when approved by the authority having jurisdiction.

Vent Termination

Venting Through a Non-Combustible and
Combustible Wall

Consult External Power Venter manufacturer instructions.

Select the power venter to match the Btuh input of the furnace be-
ing vented. Follow all of the Power Venter manufacturer's installa-

tion requirements included with the power venter for:

• venting installation,

• vent terminal location,

In Canada: Only power venters approved by the appliance
manufacturer and where allowed by the authority having jurisdic-
tion may be used

Please consult the Fields Controls Co. or Tjernlund Products, Inc.
for power venters certified for use with our furnaces.

• preventing blockage by snow,

• protecting building materials from degradation by flue gases,

• see Figure 10 for required vent termination.
NOTE: It is the responsibility of the installer to properly terminate

the vent and provide adequate shielding. This is essential in order
to avoid water/ice damage to building, shrubs and walkways.

441 01 2613 02 [_

iiiiiiiiiiiiiiiiiiiiiiiiiiiii i i! ii ii ! i ! !i ! ii i i i i i i i i i i i

Item

A

B

C

9

E

F

G

H

I

J

K
L

M

N

0

Other than Direct Vent Termination Clearance

IVIVENTTERMINAL AIRSUPPLVINLET

Clearance Descriptions Canadian Installation (1)

Clearance above grade, veranda, porch, deck, balcony, or 12" (30cm) #
anticipated snow level

Clearance to a window or door that may be opened

Clearance to a permanently closed window

Vertical clearance to a ventilated soffit located above the ter-
minal within a horizontal distance of 2' (61cm) from the cent-

edine of the terminal

Clearance to an unventilated soffit

Clearance to an outside corner

Clearance to an inside corner

Clearance to each side ofthe centedine extended above elec-
trical meter or gas service regulator assembly

Clearance to service regulator vent outlet

Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance

Clearanceto amechanicalair supplyinlet
Clearanceundera veranda,porch,deck,or balcony

6" (15 cm) for appliances _< 10,000 BTUH (3kW), 12" (30
cm) for appliances > 10,000 Btuh (3kW) and _<100,000 Btuh

(30 kW), 36" (91 cm) for appliances > 100,000 Bluh (30 kW)

3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly

3' (91 cm)

6" (15 cm) forappliances_<10,000BTUH(3kW),12" (30
cm)forappliances> 10,000Btuh(3kW) and _<100,000Btuh
(30 kW),36" (91cm)forappliances> 100,000Btuh(30 kW)

6' (1.83m)
12" (30cm) +

Clearance to each side of the centedine extended above or *
below vent terminal of the furnace to a dryer or water heater

vent, or other appliance's direct vent intake or exhaust.

Clearance from a plumbing vent stack 3' (91 cm)

Clearance above a paved sidewalk or paved driveway located 7' (2.13 m)
on public properly.

(I.) InaccordancewiththecurrentCSAB149.1,NaturalGasandPropanelnstaHationCode
(2.) In accordance with the current ANSI Z223.11NFPA 54, Nafional Fuel Gas Code

# 18" (46 cm) above roof surface

AREA WHERE TERMINAL IS NOT PERMITED

U.S. Installation (2)

12" (30 cm)

4' (1.2 m) below or to the side of the opening. 1' (30 cm)
above the opening.

3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly

4' (1.2 m) below or to the side of opening: 1' (30 cm) above
opening,

3' (91 cm) above if within 10' (3m) horizontally

3'(01cm)
7'(2.13m)

+ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture's
installation instructions.

A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

Notes:

1. The vent for this appliance shall not terminate
a. Over public walkways; or
b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nusiance or hazard or property damage; or

c. Where condensate vapor could cause damage or could be detrimental to the operafion of regulators, relief valves, or other equipment.

2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combusfiob products of adjacent vents.

Recirculafion can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.

441 O1 261302

7. Masonry Chimney Venting

Chimney Inspection

All masonry chimney construction must conform to Standard
ANSI/NFPA 211-2003 and to any state or local codes applicable.
The chimney must be in good condition and a complete chimney

inspection must be conducted prior to furnace installation. If the in-
spection reveals damage or abnormal conditions, make neces-
sary repairs or seek expert help. See Figure 11 "The Chimney

Inspection Chart". Measure inside area of tile-liner and exact
height of chimney from the top of the chimney to the highest ap-
pliance flue collar or drafthood outlet.

Connector Type

To reduce flue gas heat loss and the chance of condensate prob-
lems, the vent connector must be double-wall Type B vent.

Venting Restrictions for Chimney Types

Interior Chimney - has no sides exposed to the outdoors below
the roofline. All installations can be single furnace or common
vented with another draft hood equipped Category ] appliance.

Exterior Chimney - has one or more sides exposed to the out-
doors below the roof line. All installations with a 99% Winter De-

sign Temperature* below 17°F must be common vented only with
a draft hood equipped Category I appliance.
* The 99% Winter Design Dry-Bulb (db) temperatures are found in the

1993 ASHRAE Fundamentals Handbook, Chapter 24, Table 1 (United
States) and 2 (Ca nada), or use the 99.6% heating db temperatures found

in the 1997 or 2001 ASHRAE Fundamentals Handbook, Climatic
Design Information chapter, Table 1A (United States) and 2A
(Canada).

CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.

Failure to properly vent this furnace could result in

death, personal injury and/or property damage.
These furnaces are CSA (formerly AGA and CGA)

design-certified for venting into exterior clay
tile-lined masonry chimneys with a factory
accessory Chimney Adapter Kit. Refer to the
furnace rating plate for correct kit usage. The
Chimney Adapter Kits are for use with ONLY

furnaces having a Chimney Adapter Kit number
marked on the furnace rating plate.

Ira claytile-lined masonry chimney is being used and it is exposed
to the outdoors below the roof line, relining might be required.

Chimneys shall conform to the Standard for Chimneys, Fire-
places, Vents, and Solid Fuel Burning Appliances ANSI/NFPA

211-2003 in the United States and to a Provincial or Territorial
Building Code in Canada (in its absence, the National Building

Code of Canada) and must be in good condition.

U.S.A.- Refer to Sections 13.1.9 or 13.2.20 of the NFGC or the au-
thority having jurisdiction to determine whether relining isrequired.
If relining is required, use a properly sized listed metal liner,

Type-B vent, or a listed alternative venting design.
NOTE: See the NFGC, 13.1.9 and 13.2.20 regarding alternative

venting design and the exception, which cover installations such
as the Chimney Adapter Kits NAHAOOIDH and NAHAOO2DH.

The Chimney Adapter Kits are listed alternative venting designs
for these furnaces. See the kit instructions for complete details.

Canada (and U.S.A.)-This furnace is permitted to be vented into a
clay tile-lined masonry chimney that is exposed to the outdoors

below the roof line, provided:

1. Vent connector is Type-B double-wall, and

2. This furnace is common vented with at least 1 draft hood-
equipped appliance, and

3. The combined appliance input rating is less than the maxi-
mum capacity given in Table A, and

4. The input rating of each space-heating appliance is greater
than the minimum input rating given in Table B for Masonry
Chimneys for the local 99% Winter Design Temperature.

Chimneys having internal areas greater than 38 square
inches require furnace input ratings greater than the input
ratings of these furnaces. See footnote at bottom of Table B,

and

5. The authority having jurisdiction approves.

If all of these conditions cannot be met, an alternative venting de-
sign shall be used, such as the listed chimney adapter kit with a
furnace listed for use with the kit, a listed chimney-lining system,

or a Type-B vent.

These furnaces are CSA design-certified for use in exterior clay
tile-lined masonry chimneys with a factory accessory Chimney
Adapter Kit. Refer to the furnace rating plate for correct kit usage.

The Chimney Adapter Kits are listed alternative venting designs
and are for use with ONLY furnaces having a Chimney Adapter Kit
number marked on the furnace rating plate.

441 01 2613 02 [_

CHIMNEY INSPECTION CHART

ForadditionalrequirementsrefertotheNationalFuelGasCodeNFPA541ANSIZ223.1-2002andANSIINFPA211-2003Chimneys,Fireplaces,Vents,andSolidFuel
Burnin9 Appliancesin theU.S.A. orto the CanadianInstallationCodeCSA B149.1-05 inCanada.

Rebuild I

Reline

.._

Removemortar 1_

andtile debris?

tile m.isalignment, Yes

mg sections,

_10 No adapter venting NotSuitable

ins[ruc_lons Tor w

/,%-\ opp,cotion/

Oondonsoto ",,<u,ob,,y

of chimney?

/ w,. i T Line chimney with properly

sll • ed,,stedfle,ib,o eta,

Install chimney stz

adapter per

V [ liner or Type-g vent per NFGC or

_,,,_.. I I mstructlons. NSCNGPIC Vent Sizing Tables

j Tu_ I NotSuitable andlinerorventmanufacturer's

Chimney ! _ Is Chimney to _ t,l_.[. _ PartCofchimney

exposed to outdoors _ _ h_ a_i_t_H t,-,= _'_ Ir I .,.,.,/" adapter venting _le

belowroofline? Yes "_ "_fur'na;e_ _ _ instructions for |

\ / I -,,<u,,ab,,y

No V 1 V _ ia_;PutcetloPnesr'

_] 441 01 261302

Exterior Masonry Chimney,

FAN+NAT Installations with

Type-B Double-Wall Vent Connectors

VENT

HEIGHT

(FT)

6

8
10
15

20
30

© NFPA & AGA

Table A-

Combined Appliance

Maximum Input Rating in

Thousands of Btu per Hr

INTERNAL AREA OF CHIMNEY

(SQ IN,)

12 19 28 38
74 119 178 257

80 130 193 279
84 138 207 299

NR 152 233 334
NR NR 250 368

NR NR NR 404

Table B-

Minimum Allowable Input Rating of

Space-Heating Appliance in

Thousands of Btu per Hr

VENT INTERNAL AREA OF CHIMNEY

HEIGHT (SQ IN.)

(FT) 12 19 28 38

Local 99% Winter Design Temperature: 17 to 26 ° F*

6

[o 8

o 10

is

2O
30

6

8

'- 10

0

15
2O

30

6

8

o 10

_ is

i

20
30

-11 ° F
or

lower

If the inspection of a previously used tile-lined chimney:

a. Shows signs of vent gas condensation, the chimney should

be relined in accordance with local codes and the authority
having jurisdiction. The chimney should be relined with a
listed metal liner, Type-B vent, or a listed chimney adapter
kit to reduce condensation. If a condensate drain is required

by local code, refer to the NFGC, Section 10.9 for additional
information on condensate drains.

b. Indicates the chimney exceeds the maximum permissible

size in the tables, the chimney should be rebuilt or relined to
conform to the requirements of the equipment being
installed and the authority having jurisdiction.

A chimney without a clay tile liner, which is otherwise in good con-
dition, shall be rebuilt to conform to ANSI/N FPA 211 or be lined with

a UL listed (ULC listed in Canada) metal liner or UL listed Type-B
vent. Relining with a listed metal liner or Type-B vent is consid-

ered to be a vent-in-a-chase.
If a metal liner or Type-B vent is used to line a chimney, no other

appliance shall be vented into the annular space between the
chimney and the metal liner.

APPLIANCE APPLICATION REQUIREMENTS

Appliance operation has a significant impact on the performance
of the venting system. If the appliances are sized, installed, ad-

0 55 99 141

52 74 111 154

NR 90 125 169
NR NR 167 212

NR NR 212 258
NR NR NR 362

Local 99% Winter Design Temperature: 5 to 16° F*

NR 78 121 166
NR 94 135 182

NR 111 149 198
NR NR 193 247

NR NR NR 293
NR NR NR 377

justed, and operated properly, the venting system and/or the ap-

pliances should not suffer from condensation and corrosion. The
venting system and all appliances shall be installed in accordance
with applicable listings, standards, and codes.

The furnace should be sized to provide 100 percent of the design
heating load requirement plus any margin that occurs because of

furnace model size capacity increments. Heating load estimates
can be made using approved methods available from Air Condi-

tioning Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air-Conditioning Engineers; or other
approved engineering methods. Excessive oversizing of the fur-

nace could cause the furnace and/or vent to fail prematurely.
When a metal vent or metal liner is used, the vent or liner must be in

good condition and be installed in accordance with the vent or liner
manufacturer's instructions.

To prevent condensation in the furnace and vent system, the fol-
lowing precautions must be observed:

1. The return-air temperature must be at least 60°F db except

Local 99% Winter Design Temperature: -10 to 4° F*

NR NR 145 196
NR NR 159 213

NR NR 175 231
NR NR NR 283

NR NR NR 333
NR NR NR NR

Local 99% Winter Design Temperature: -11 ° F or

lower*

Not recommended for any vent configuration

* The 99% Winter Design Dry-Bulb (db) temperatures are found in the

1993 ASHRAE Fundamentals Handbook, Chapter 24, Table I

for brief periods of time during warm-up from setback at no
lower than 55°F db or during initial start-up from a standby

condition.

2. Adjust the gas input rate per the installation instructions.
Low gas input rate causes low vent gas temperatures, ca us-
ing condensation and corrosion in the furnace and/or vent-
ing system. Derating is permitted only for altitudes above

2000'1

3. Adjust the air temperature rise to the midpoint of the rise
range or slightly above. Low air temperature rise can ca use

low vent gas temperature and potential for condensation
problems.

4. Set the thermostat heat anticipator or cycle rate to reduce
short cycling.

(United States) and 2 (Canada), or use the 99.6% heating db

temperaturesfound in the 1997 or 2001 ASHRAE Fundamentals

Handbook, Climatic Design Information chapter, Table 1A (United
States) and 2A (Canada).

Inspections before the sale and at the time of installation will deter-
mine the acceptability of the chimney or the need for repair and/or

(re)lining. Refer to the Chimney Inspection Chart to perform a
chimney in_._..pection.

441 01 2613 02

Air for combustion must not be contaminated by halogen com-
pounds which include chlorides, fluorides, bromides, and iodides.
These compounds are found in many common home products

such as detergent, paint, glue, aerosol spray, bleach, cleaning sol-
vent, salt, and air freshener, and can cause corrosion of furnaces

and vents. Avoid using such products in the combustion-air sup-
ply. Furnace use during construction of the building could cause

the furnace to be exposed to halogen compounds, causing prema-
ture failure of the furnace or ventincj_stem due to corrosion.

Ventdampersonanyapplianceconnectedto the common vent

can cause condensation and corrosion in the venting system. Do
not use vent dampers on appliances common vented with this fur-

nace.

8. Gas Supply and Piping

CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.

GasPiping Requirements

NOTE: The gas supply line must be installed by a qualifted service
technician in accordance with all building codes.

NOTE: In the state of Massachusetts.

Failure to follow safety warnings exactly could
result in serious injury, death, and/or property
damage.

Models designated for Natural Gas are to be used

with Natural Gas ONLY, unless properly converted to

use with LP gas.

GasSupplyRequirements

1.

• Use only the Type of gas approved for this furnace. See rating
plate for approved gas type. 2.

• Gas input must not exceed the rated input shown on the rating
plate. Overfiring will result in failure of heat exchanger and
cause dangerous operation.

Do not allow minimum supply pressure to vary downward. Do-
ing so will decrease input to furnace. Refer to Table 3 for gas
supply. Refer to Table 6 and Table 7 for manifold pressures.

IGasPressures

Supply Pressure

Gas Type

Recommended Max.

Natural 7" 14"

Propa ne 11" 14"

Min,

4.5"
11"

a. Gas supply connections MUST be performed by a li-

censed plumber or gas fitter).

b. When flexible connectors are used, the maximum length

shall not exceed 36" (915 mm).

c. When lever handle type manual equipment shutoff

valves are used, they shall be T-handle valves.
d. The use ofcopper tubing for gas piping is NOT approved.
Install gas piping in accordance with local codes, or in the ab-

sence of local codes, the applicable national codes.
It is recommended that a manual equipment shutoff valve be

installed in the gas supply line outside the furnace. Locate
valve as close to the furnace as possible where it is readily ac-
cessible. Refer to Figure 12.

FIRE HAZARD
Failure to follow safety warnings exactly could

result in death or personal injury.
Use wrench to hold furnace gas control valve when

turning elbows and gas line to prevent damage to
the gas control valve and furnace.

Typical Gas Piping (N8MP)

Drip Leg and Union, Union* should be outside the

cabinet. Manual shut- off valve MUST be upstream of
dripleg, union, and furnace.

Use elbows and 3" pipenipple to connectvalveto
pipingwhen using right sidegas pipeentry. _.

LPLowpressure 3'_pipe

switch.

Manual shut- off

valve

Alterative

25-24-86

* Union may be installed inside the cabinet when necessary because of clearances.

3. Useblackironorsteelpipeandfittingsorotherpipeapproved 4. Use pipe thread compound which is resistant to natural and
by local code. LP gases.

_] 44101 261302

5,

6,

7.

Use ground joint unions and install a drip leg no less than 3"
long to trap dirt and moisture before it can enter gas control

valve inside furnace.

Provide a 1/8" NPT plugged tapping for test gauge connection
immediately up stream of gas supply connection to furnace.

Use two pipe wrenches when making connections to prevent
furnace gas control valve from turning.

NOTE: If local codes allow the use of a flexible gas appliance con-
nector, always use a new listed connector. Do not use a connector

which has previously served another gas appliance.

8. Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace

or ductwork.

9. Properly size gas pipe to handle combined appliance load or
run gas pipe directly from gas meter or LP gas regulator.

10. Install correct pipe size for run length and furnace rating.

11. Measure pipe length from gas meter or LP second stage regu-
lator to determine gas pipe size.

Right Side Gas SupplyPiping (N8MP)

Gas line can be installed directly to the gas valve through the hole
provided in the right side of the cabinet. See Figure 12

Left Side Gas Supply Piping (N8MP)

Two(2) 90 ° street elbows or two(2) 90 ° standard elbows and
two(2) close nipples are required for left side gas supply. See

Figure 12.

Piping with Street Elbows

1,

Assemble the elbows so that the outlet of one(l) elbow is 90 °

from the inlet of the other. The elbows should be tight enough

to be leak proof. An additional 1/4 turn will be required at the

end of step 2, see Figure 13.

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2,

(_ 25-23-23c

Screw elbow assembly into gas valve far enough to be leak
proof. Position el bow assembly so that the inlet of the el bow is
at the top of the gas valve. An additional 3/8 turn will be re-

quired in step 3. Turn open end of inlet elbow to face the left
side of the furnace (1/4 turn), see Figure 14.

Gas Valve with Elbows (N8MP)

3. Turn assembly an additional 3/8 turn to position inlet near the
bottom back corner of the gas valve in line with gas opening

on left side of furnace, see Figure 15.

4. Gas supply line then can be run directly into opening of elbow.

Piping with Close Nipples and Standard Elbows

1. Assemble elbows and nipples similar to street elbows shown
in Figure 13.

2. Follow steps 2 through 4 Piping with Street Elbows.

Gas Valve with Elbows (N8MP)

25-24-96a-2

FIRE HAZARD

Failure to follow safety warnings exactly could
result in death, personal injury and/or property
damage.

Use wrench to hold furnace gas control valve when
turning elbows and gas line to prevent damage to

the gas control valve and furnace.

Left Side Gas Entry C8MP) (See Figure 16)

Pipe can be run directly to gas valve through the hole provided in
the left side of the cabinet.

Right Side Gas Entry C8MP) (See Figure 16)

Two (2) 90 ° street elbows or two (2) 90 ° standard elbows and two
(2) close nipples are required for right side gas supply,.

441 01 2613 02 [_

Typical Gas Piping ('aMP)

25-25-02

Piping with Street Elbows

1. Screw one elbow onto gas valve with the outlet facing away
from the furnace.

2. Screw second elbow onto first elbow tight enough to be leak
proof. An additional 1/4 turn will be required at the end of step

2. See Figure 17 and Figure 18.

Gas Valve with Elbows ('8MP)

25-25-03

iiiiiiiiiiiiiiiiiiiiiiiii:iiiiiiiiiii::::::;iiiiiiii!;!!i!!!!!i!!!!!!i!iiiiiiiiiiiiiillI

Gas Valve with Elbows (_8MP)

3. Gas supply line then can be run directly into opening of elbow.

Piping with Close Nipples and Standard Elbows

1. Assemble elbows and nipples similar to street elbows shown
in Figure 13.

2. Follow steps 2 through 4 Piping with Street Elbows.

FIRE OR EXPLOSION HAZARD.

Failure to properly install metal gas connector could
result in death, personal injury and/or property
damage.

A flexible corrugated metal gas connector must be
properly installed, shall not extend through the side

of the furnace, and shall not be used inside the
furnace.

Black iron pipe shall be installed at the furnace gas
control valve and extend a minimum of 2" outside

furnace.

Additional LP Piping Requirements

• Have a licensed LP gas dealer make all connections at stor-
age tank and check all connections from tank to furnace.

• If copper tubing is used, it MUST comply with limitation set in
Local Codes, or in the absence of local codes, the gas codes
of the country having jurisdiction.

• Two-stage regulation of LP gas is recommended.

FIRE OR EXPLOSION HAZARD.
An open flame or spark could result in death,

personal injury and/or property damage.
Liquefied petroleum (LP) gas is heavier than air and

will settle and remain in low areas and open

depressions.
Thoroughly ventilate area and dissipate gas. Do

NOT use a match or open flame to test for leaks, or
attempt to start up furnace before thoroughly

ventilating area.

Final Check

• Test all pipe for leaks.

• If orifices were changed, make sure they are checked for
leaks.

During pressure testing of gas supply piping system:
a. If test pressure does not exceed 1/2" psi, isolate the

furnace from the gas supply piping system by closing the
equipment shutoff valve.

b. If test pressure exceeds 1/2" psi, the furnace and its manual
equipment shutoff valve must be disconnected from the gas
supply piping system.

To check for leaks apply soap suds or a liquid detergent to
each joint. Bubbles forming indicate a leak.

Do not use an open flame to test for gas leaks. Fire or explo-
sion could occur.

• Correct even the smallest leak at once.

_] 441 01 2613 02

9. Electrical Wiring

ELECTRICALSHOCK HAZARD.
Failure to follow safety warnings exactly could

result in death or personal injury.

Turn OFF electrical power at fuse box or service

panel before making any electrical connections
and ensure a proper ground connection is made
before connecting line voltage.

Power Supply Wiring

The furnace MUST be electrically wired and grounded in accor-
dance with local codes, or in the absence of local codes, with the
National Electrical Code (NEC), ANSI/NFPA 70-2002 in the U.S.,

or the Canadian Electrical Code (CEC), CSA C22.1 in Canada.

The power supply to the furnace connections must be between
104 VAC and 127 VAC during furnace operation for acceptable

performance.

Field wiring connections must be made inside the furnace connec-
tion box. A suitable strain relief should be used at the point the

wires exit the furnace casing.

Copper conductors shall be used. Line voltage wires should
conform to temperature limitation of 63 ° F (35 ° C) rise. Wire and
circuit breaker sizing shall be based on the ampacity of the furnace

electrical components plus the amps for all installed accessories
(1.0 amps total for EAC and HUM). Ampacity can be determined
by using the NEC or CEC.

NOTE: Furnace will not have normal operation if line polarity is re-
versed. Check ALL field and control connections prior to opera-

tion.

Furnace must be installed so the electrical components are pro-
tected from water and connected to its own separate circuit.

J- Box Relocation

N8MPN/L Models

The J-box is installed in blower compartment on left side of casing.
An alternate J-box location on right side can be used.

1. Remove bag containing two hole plugs and two self-tapping
screws from loose parts bag in blower compartment.

2. Remove and discard two screws holding J-box to casing.

3. Move large hole plug from right to left J-box location.

4. Move J-box to alternate location and attach using two self-

tapping screws from bag.

5. Apply two hole plugs from bag at left J-box location.

6. Position all wires away from sharp edges and moving parts.
Do not pinch J-box wires or other wires when reinstalling

blower compartment door.

*8MPN/L Models

The J-box is installed in the burner compartment on left side of
casing. An alternate J-box location on right side can be used:

1. Remove and save two screws holding J-box to casing.

2. Move large hole plug from right to left J-box location.

3. Clip wire tie holding J-box wires.

4. Move J-box to alternate location and attach using two screws
removed from left side location.

Position all wires away from hot surfaces, sharp edges, and
moving parts. Do not pinch J-box wires or other wires when
reinstalling burner compartment door.

Thermostat

Thermostat location has an important effect on the operation of the
furnace. Follow instructions included with thermostat for correct

mounting and wiring.

Low voltage connections to furnace must be made on terminal
board to furnace control. (See Figure 19)

If cooling is used, the Y from the thermostat must be connected to
the control board Y to energize cooling blower speed.

Set thermostat heat anticipator in accordance with the Technical

Support Manual.

Heat anticipator setting will need to be measured if 24VAC humidi-
fier is installed. Measure currentin series from R to W at thether-

mostat. Be sure 24VAC humidifier is wired up to control. Allow
furnace to operate for 2 minutes before recording the AC amper-
age reading. Set anticipator on thermostat to recorded value.

Optional Equipment

All wiring from furnace to optional equipment MUST conform to lo-
cal codes or, in the absence of local codes, the applicable national
codes. Install wiring in accordance with manufacturer's instruc-

tions.

Humidifier/Electronic Air Cleaner

The furnace is wired for 115 VAC humidifier and/or electronic air
cleaner connection.

REDUCED FURNACE LIFEHAZARD

Failure to follow caution instructions may result in
reduced furnace life.

Do NOT exceed 115V/1.0 amp. maximum current
load for both the EAC terminal and the HUM

terminal combined.

HUMIDIFIER - The 24VAC HUM is energized when the pres-
sure switch closes on a call for heat. The HUM (115VAC) is en-

ergized when the inducer is energized.

ELECTRONIC AIR CLEANER - EAC is energized when there
is a blower speed call, except is NOT energized when blower
operates in the hard-wired continuous fan mode.

441 01 261302 [_

Electrical Connections

115V.60Hz.

Gr_nd

Thermostat

I ! , I

L ] _ _

Low Voltage
Terminal Board

NOTE: 115 VAC/6OHz/single-phase

Operating voltage range*: 127 VAC max, 104 VAC min.

* Permissible limits of voltage at which unit will operate satisfactorily

Furnace Control

The furnace control is preset at the factory with ON delay of 30 sec-
onds in the heating mode. The blower OFF timing is preset at 140

seconds. If desired, the fan OFF delay can be reset to obtain the
longest delay times while still maintaining comfort levels. See
"Furnace Wiring Diagram".

Furnace Control Fuse

The 24V circuit contains a 5-amp, automotive-type fuse located
on furnace control. (See Figure 20) Any electrical shorts of 24V

wiring during installation, service, or maintenance may cause fuse
to blow. If fuse replacement is required, use only a fuse of identical
size (5 amp.).

Control Connections

Jumper _>_/_ ___ _ DiagnosticLight

24v c4.

.0M

" _ _ _ 25-24-98

10. Ductwork and Filter (Upflow/Horizontal)

CARBON MONOXIDE POISONING HAZARD.

Failure to properly seal duct could result in death or
personal injury.

Do NOT draw return air from inside a closet or utility
room where furnace is located. Return air duct

MUST be sealed to furnace casing.

Duct Connections

This furnace may be installed in only a bottom or side return-air
duct application. Return air duct connections through the back of
the furnace is NOT permitted.

Cutting Side Return Air Opening

Plugged

,,Starting

0 /_/'I'I / Hole

I

Upflow ONLY: Side return-air duct connections can be made by
cutting out the embossed area shown in Figure 21. A plugged

hole is provided at each furnace side duct location to help start cut-
ting the opening. Side duct connections are NOT permitted in hori-
zontal flow applications.

Upflow and Horizontal Flow: Bottom return-air duct connec-
tions can be made by removing the knockout panel in the furnace

base. Do NOT remove knock-out except for a bottom return-air
duct connection.

Duct Design

Design and install air distribution system to comply with Air Condi-
tioning Contractors of America manuals or other approved meth-
ods that conform to local codes and good trade practices.

When the furnace is located in an area near or adjacent to the living
area, the system should be carefully designed with returns to mini-
mize noise transmission through the return air grille. Any blower

moving a high volume of air will produce audible noise, which could
be objectionable when the furnace is located very close to a living

_] 441 01 2613 02

area. It is often advisable to route the return air ducts under the Filters are not supplied with these furnaces, but can be purchased
floor or through the attic, from your distributor.

• Refer to furnace Technical Support Manual (Blower Data)
for air flow information.

• Size ductwork to handle air flow for heating (and air condition-
ing if so equipped).

Duct Installation Requirements

When a furnace is installed so that supply ducts carry air cir-

culated by the furnace to areas outside of the space contain-
ing the furnace, the return air shall also be handled by duct(s)
sealed to the furnace casing and terminating outside the
space containing the furnace.

CARBON MONOXIDE POISONING HAZARD.

Failure to follow safety warning exactly could
result in death, personal injury, and/or component
damage.

Install cooling coil on furnace discharge. Cool air
passing over heat exchanger could cause conden-

sate to form resulting in heat exchanger failure.

• When the furnace is used with a cooling unit, the furnace shall
be installed parallel with or on the upstream side of the cooling
unit to avoid condensation in the heating element.

With a parallel flow arrangement, the da topers or other means

used to control flow of air shall be adequate to prevent chilled
air from entering the furnace. Chilled air going through the fur-

nace could cause condensation and shorten furnace life.
Dampers (purchased locally) can be either automatic or

manual. Manually or automatically operated dampers MUST
be equipped with a means to prevent furnace and air condi-

tioning operation, unless damper is in the full heat or cool posi-
tion.

• Installation of locking-type dampers is recommended in all
branches, or in individual ducts to balance system's air flows.

• Non-combustible, flexible duct connectors are recom-
mended for return and supply connections to furnace.

• If air return grille is located close to the fan inlet, install at least
one 90 ° air turn between fan and inlet grille to reduce noise.

• Ductwork installed in attic or exposed to outside temperatures
requires a minimum of 2" of insulation with outdoor type vapor

barrier.

• Ductwork installed in an indoor unconditioned space requires
a minimum of 1" of insulation with indoor type vapor barrier.

Inspection Panel on some models

For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be

accessible when the furnace is installed and shall be of such a size
that the heat exchanger ca n be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air

stream. This access cover shall be attached in such a manner as
to prevent air leaks.

Filters

A filter MUST be used.

441 01 2613 02

See Table 4 for required high-velocity filter sizes.

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Cabinet

Width

151/2
191/2
223/4

High-Velocity Air Filter Sizes (max.600FPM)

Internal Filter External Filter Rack

Bottom Bottom Side+

14X25 14X25 14X25 or 16X25
16X25" 16X25" 16X25"
20X25" 20X25" 16X25"

Greater than 1600 CFM requires both (left and right) side return filter

racks in upflow position.

+ Side return air duct(s) is not permitted with horizontal or downflow furnace
installation,

Use either filter type:

• Washable, high-velocity filters are based on a maximum air
flow rating of 600 FPM.

• Disposable, low velocity filters are based on a maximum air
flow of 300 FPM when used with external filter grille.

RISK OF REDUCED FURNACE LIFE
Failure to follow these Caution may result in

premature furnace component failure.
Use of excessively dirty and/or restrictive air filters

may increase furnace operating temperatures and
shorten the life of the furnace.

Filters specified for the furnace are rated at a maximum
of 600 FPM air velocity and sized for the furnace's

airflow rate. Replacement filters must be of equivalent

type, size, and rating except as described below.

Disposable, low-velocity filters may be used to replace

washable, high-velocity filters, providing they are sized

for 300 FPM or less.

I

• The furnaces with 1600 or less CFM rating use a 16" x 25"
high-velocity filter. On these models the filter may be
mounted internally for bottom return or a filter and rack may

be mounted externally for bottom return.

• The furnaces with greater than 1600 CFM require that both
(left and right) side returns are used. Two side return filters
and racks are required. Filter racks must be mounted exter-

nally. See Figure 24.

• If return air must be on one side only, an optional 20" x 25"
filter standoff rack kit can be used. (See Figure 22.) For bot-

tom return, an internal filter can be used or a filter rack kit can
be mounted externally.

• See pages 40 & 46, CirculatorAirBIowerData for additional
data.

NOTE: The 20" x 25" standoff side filter rack gives more filter area
but does not provide more air. See Figure 22. To achieve 2000
CFM 2 side returns are still needed. See Figure 24.

NOTE: Disposable low-velocity filters may be replaced with
washable, high-velocity filters. Washable, high-velocity filters can

be replaced ONLY with same type and size filter unless low-veloc-
ity filters meet the minimum size areas for 300 FPM or less.

Optional Duct Standoff

Filter

20 x 25 Optional
Filter Rack

25-23-05-4

Optional Filter Rack Installation: Side Return

Center the filter rack on the side panel, flush with the bottom edge
of the furnace. Mark the fastening holes. Drill the fastening holes

in the side panel and fasten the filter rack in place with sheet metal
screws. See Figure 23 and Figure 24.

iiiiii¸i¸i¸i¸i¸iiiiii_¸I¸!iii!iii¸iiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiii;ii;ii;ii;ii¸ii

Side Return Filter Rack

Filter

25-23-05-4a

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i_ Filters Installed on Two Sides

Using Two
Filter Racks

Filter

Filter

25-23-05-3

Internal Filter in Bottom- Return Installation

When installing a bottom-mounted filter inside the furnace, install
the filter clips on the edge of the bottom duct opening with the wider
end of the clips toward the blower, as shown in Figure 25. Clips
may be obtained from your distributor or fabricated from sheet
metal (Figure 26). Insert filter into side clips first and push filter
back until it is fully engaged into back clip.

Bottom Mounted Filter

Center Clip

sideto

25-24-18-1

11/4"

26 Ga, Galvanized Steel

NOTE: If filters are only suitable for heating application, advise
homeowner that filter size may need to be increased if air condi-
tioning is added.

Addition Of Air Conditioning

When a refrigeration coil is used in conjunction with this furnace, it
must be installed on the discharge side of the furnace to avoid con-
densation in the heat exchanger. The coil installation instructions

must be consulted for proper coil location and installation proce-
dures. With a parallel flow arrangement, dampers must be
installed to prevent chilled air from entering the furnace. Ifmanual-

ly operated dampers are used, they must be equipped with a
means to prevent operation of either unit unless the damper is in
full heat or full cool position.

Copper or plastic tubing may be used for the condensate drain line.

441 O1 261302

11. Ductwork and Filter (Downflow)

CARBON MONOXIDE POISONING HAZARD.
Failure to properly seal duct could result in death

or personal injury.
Do NOT draw return air from inside a closet or
utility room where furnace is located. Return air

duct MUST be sealed to furnace casing.

FIRE HAZARD.
Failure to install furnace on noncombustible

subbase could result in death, personal injury and/or
property damage.

Place furnace on noncombustible subbase on
downflow applications, unless installing on

non-combustible flooring.

FIRE HAZARD.

Failure to connect the return air duct to the top of a
downdlow furnace could result in death, bodily
injury, and/or property damage.

Side return air duct(s) may cause excessive furnace
and/or air temperatures, which could result in death,
bodily injury, and/or property damage.

Return air duct is to be connected to only the top of
downflow furnace.

BURN HAZARD.

Outlet Duct Flange

Downflow installations with cased coils require the furnace outlet
duct flange to be bent outward and flat to mate the outlet of the fur-

nace to the cased coil.

Sub-Bases for Combustible Floors - Furnace Only

Note: When using the subbase for combustible floors, the dis-
charge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the
duct flanges flat onto the furnace casing. DO NOT bend the duct

flanges inward (toward the heat exchangers) as air flow restric-
tions may occur.

The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the fur-

nace is installed on a coil box.

The vent may be hot. Failure to install vent shield

properly could result in personal injury.
Install VENT PIPE SHIELD NAHAOO2VC as

described below.

Cut the opening in the floor according to the dimensions in
Table 5 because the base is equipped with locating tabs that
center the base over the opening.

The opening in the base is 11/4" shorter and 11/8" narrower
than the minimum required size of the opening in the floor.

This is done to maintain a 1" clearance between the floor and
the plenum.

Vent Shield

Vent shield is required for all downflowinstallations. The vent Must
exit out the side of the furnace for all downflow installations. This

places the hot vent pipe (over 300 ° F) within reach of children. Vent
shield attaches to side of furnace to cover vent pipe. See Figure 5

in "2, Installation"section.

2.

3.

Fabricate the plenum to the dimensions given in Table 5.
Note that the dimensions given are outside dimensions.

Set the base over the opening in the floor, centering the open-
ing in the base over the opening in the floor. Fasten the base to

the floor with screws or nails. See Figure 27 and Figure 28.
Drop the plenum through the opening in the base. The flange

of the plenum should rest on top of the combustible floor base.

] Sub-bases for Combustible Floors Dimensions

Sub-base for

Combustible Floors

Part Number H"

Subbase for Furnace Only

NAHHO01 SB 1511/16
NAHHOO2SB 195/16
NAHHOO3SB 2215/16

Subbase for Coil Box

NAHHOO4SB
NAHHOOSSB

NAHHOO6SB

Outside Dimension

Sub-base for Combustible

Floor Dimensions Opening In Floor

J* K** L M N

283/4 149/16 18 181/4 145/8
283/4 183/16 18 181/4 181/4
283/4 2113/16 16 161/4 21_/8

1511/16 209/16 149/16 16 161/4 145/8

19s/16 209/16 183/16 16 181/4 181/4

2215/16 209/16 2113/16 16 161/4 211/8

Opening In

Base For Plenum

Typical Plenum

Dimensions

15
15
15

"* Base Spacer Side To Side

441 01 261302

P R

15 131/2
15 171/8
15 193/4

15 131/2
15 171/8
15 193/4

15
15

15

131/2
171/8
193/4

131/2
171/8
193/4

Exploded View of Sub-Base for
Furnace ONLY

I tr

Combustible

FloorBase

¸i!i i¸i

Subbase Furnac_
Insulation

Wood Screw

Setting the Base

/

_. % _W_°°d Fl°°r

Sub-base for Combustible Floors - Downflow Coil
Adapter Box

The subbase for combustible floors is required when a downflow
furnace, used with a downflowcoilbox, is set on combustible

flooring.

1,

2.

3.

Cut the opening in the floor according to the dimensions in
Table 5 because the base is equipped with locating tabs that
center the base over the opening.

The opening in the base is 11/4 "shorter and 11/8 " narrower

than the minimum required size of the opening in the floor.

This is done to maintain a 1" clearance between the floor and

the plenum.

Fabricate the plenum to the dimensions given in Table 5.

Note that the dimensions given are outside dimensions.

Set the base over the opening in the floor, centering the open-
ing in the base over the opening in the floor. Fasten the base

to the floor with screws or nails. See Figure 29 and

Figure 30.

Drop the plenum through the opening in the base. The flange
of the plenum should rest on top of the combustible floor base.

WoodFloor

Consideration must be given to the height of the base to allow for
easy installation of the condensate drain. See Figure 31. This

subbase for combustible floors has been designed so that the
height of the subbase raises the downflow coil off the floor to allow
easy installation of the condensate drain

Condensate Line Raised by Base

25-20-52

Non-Combustible Floor

Set the furnace over the opening in the floor. If necessary, grout
around the base to seal air leaks between the base and the floor.

Duct Connections

In the downflow position, the return-air duct must be connected to
only the top of the furnace. Top return connections can be made by

removing the knockout panel in the furnace base. Return air con-
nection through the side(s) or back of the furnace is NOT allowed.

441 01 261302

Exploded View of Base for
Downflow Cased Coil

Combustible
Floor Base

25-21-46b

iiiiiiiiiiiiiiiiiiii_i_}!¸i!}!}i!;;i;iiii!i;;i;illlliii;}i¸i¸i¸i¸i¸i¸i¸;}i;i;ii;;i;;i;;i;;i;;i;liiiiii¸iiiiiiiiiiiiiiiiilii}i

Setting the Base

Subbase '_ /

Insulation II

Plenum

25-20-46A

Duct Design and Duct Installation Requirements

See Section 10.

Internal Filter in Top Return Installation

When instal ling top-mounted filter inside the furnace, install the fil-
ter clips on the edge of the top duct opening with the wider end of

the clips toward the blower as shown in Figure 32. Clips may be
obtained from your distributor or fabricated from sheet metal

(Figure 33). Insert filterintosideclips firstand push filter backuntil
it is fully engaged into back clip.

Top Mounted Internal Filter

j_

Clip

side-to-side

26 Ga. Galvanized Steel

NOTE: If filters are only suitable for heating application, ad-

vise homeowner that filter size may need to be increased if air
conditioning is added.

Addition Of Air Conditioning

See Section 10.

12. Checks and Adjustments

Startup

NOTE: Refer to startup procedures in the Users Information
Manual.

ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.

Failure to follow safety warnings exactly could
result in death, personal injury and/or property

damage.
If any sparks, odors or unusual noises occur,

immediately shut OFF gas and power to furnace.
Check for wiring errors or obstruction to blower.

GasSupply Pressure

Gas supply pressure should be within minimum and maximum val-
ues listed on rating plate. Pressures are usually set by gas suppli-

ers.

(See LP Gas Conversion Kit instruction manual for furnaces con-
verted to LP gas.)

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas at shut off before connecting
manometer could result in death, personal injury

and/or property damage.
Turn OFF gas at shut off before connecting

manometer.

1. With gas OFF, connect manometer to manifold pressure tap
on outlet of gas control valve. See Figure 34. Use a manome-

ter with a 0" to 12" water column range.

Typical Gas Control Valve Honeywell

RegulatorAdjustment
UnderCa

Inlet
Pressure

Tap1/8NPT

HONEYWELL

©o

Outlet
Pressure

Tap

1/8NPT

/

OUTLET

25-24-98a

Manifold Gas Pressure Adjustment 2. Turn gas ON. Operate the furnace by using a jumper wire on

the R to W thermostat connection on the control.

NOTE: Make adjustment to manifold pressure with burners oper- 3. Remove manifold pressure adjustment screw cover on fur-
atin . nace as control valve. Turn ad_screw counterclock-

44101 261302

wiseto decreasemanifoldpressureandclockwiseto Operation Above 2000' Altitude

increase pressure.

NOTE: Adjustment screw cover MUST be replaced on gas control
valve before reading manifold pressure and operating furnace.

4,

5.

Set manifold pressure to value shown in Table 6 or Table 7.

When the manifold pressure is properly set, replace the ad-

justment screw cover on the gas control valve.

6. Remove jumper wire from thermostat connection on fan

board. Remove manometer connection from manifold pres-
sure tap, and replace plug in gas valve.

7. Check for leaks at plug.

Natural Gas Input Rating Check

The gas meter can be used to measure input to furnace. Check
with gas supplier for actual BTU content.

1. Turn OFF gas supply to all appliances other than furnace and
start furnace. Use jumper wire on R to W.

2. Time how many seconds it takes the smallest dial on the gas
meter to make one complete revolution.

Note: If meter uses a 2 cubic foot dial, divide results (seconds) by
two.

Refer to Example. The Example is based on a natural gas BTU
content of 1,000 BTU's per cubic foot.

Example

Natural Gas Time Per Cubic

BTU Content No. of Seconds Foot in BTU Per

Per Hour Hour

per cubic foot Seconds

1,000 3,600 48 75,000

1,000 x 3,600 + 48 = 75,000 BTUH

3. Remove jumper wire from R to W.

4. Relight all appliances and ensure all pilots are operating.

Orifice Sizing

NOTE: Factory sized orifices for natural and LP gas are listed in
the furnace Technical Support Manual.

Ensure furnace is equipped with the correct main burner orifices.
Refer to Table 6 or Table 7 for correct orifice size and manifold

pressure for a given heating value and specific gravity for natural
and propane gas.

FIRE, EXPLOSION, CARBON MONOXIDE
POISONING HAZARD.

Failure to follow these instructions exactly could
result in death, personal injury and/or property dam-

age.

This high-altitude gas-conversion shall be done by

a qualified service agency in accordance with the

Manufacturer's instructions and all applicable
codes and requirements, or in the absence of local
codes, the applicable national codes.

These furnace may be used at full input rating when installed at al-
titudes up to 2000'. When installed above 2000', the input must be

decreased 2% (natural) or 4% (LP) for each 1000' above sea level
in the USA. In Canada, the input rating must be derated 5% (natu-

ral) or 10% (LP) for each 1000' above sea level. This may be ac-
complished by a simple adjustment of manifold pressure or an
orifice change, or a combination of a pressure adjustment and an

orifice change. The changes required depend on the installation
altitude and the heating value of the fuel. Table 6 & Table 7 show

the proper furnace manifold pressure and gas orifice size to
achieve proper performance based on elevation above sea level
for both natural gas and propane gas.

To use the natural gas table, first consult your local gas utility for
the heating value of the gas supply. Select the heating value in the

first column and follow across the table until the appropriate eleva-
tion for the installation is reached. The value in the box at the inter-

section of the altitude and heating value provides not only the
manifold pressure but also the orifice size. In the natural gas tables

the factoy-shipped orifice size is in bold (42). Other sizes must be
obtained from service parts.

High Altitude Input Rate =

Nameplate Sea Level Input Rate x (Multiplier) [USA]

Elevation

2001'-3000'
3001'-4000'
4001'-5000'

5001'-6000'
6001'-7000'
7001'-8000'

High Altitude Multiplier

Natural Gas

0.95

0.93

0.91

0.89

0.87

0.85

LP Gas

0.90

0.86

0.82

0.78

0.74

0.70

* Based on mid-range of elevation.

_] 441 01 261302

MANIFOLDPRESSUREAND ORIFICESIZEFORHIGHALTITUDEAPPLICATIONS

NATURAL GAS MANIFOLD PRESSURE (" w.c.)

.............................................................. MEAN ELEVATION FEET ABOVE SEA LEVEL

HEATING 0 to 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to

VALUE 2000 3000 4000 5000 6000 7000 8000

at ALTITUDE Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold

BTU/CU. FT. No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure

700 41 3.7
725 41 3.7 41 3.4

750 41 3.5 42 3.6
775 41 3.6 42 3,6 42 3.3

800 41 3.6 42 3.7 42 3.4 42 3.1
825 41 3.7 41 3.4 42 3,5 42 3,2 42 2.9

850 41 3.5 42 3.6 42 3.3 42 3.0 42 2.8
875 41 3.6 42 3,6 42 3.4 42 3,1 42 2,8 42 2.6
900 42 3,7 42 3,4 42 3.2 42 2,9 42 2,7 42 2.5
925 41 3.7 42 3.5 42 3.3 42 3.0 42 2,8 42 2.5 44 3.3
950 41 3.5 42 3,3 42 3,1 42 2.9 42 2,6 42 2,4 44 3.1

975 42 3.7 42 3.2 42 2.9 42 2.7 42 2.5 44 3.2 45 3.6

1000 42 3.5 42 3,0 42 2,8 42 2.6 42 2.4 45 3.7 45 3.4
1050 42 3.2 42 2.7 42 2.5 44 3.3 45 3.6

1100 43 3.6 42 2,5 44 3.2 45 3.6

NOTE: Natural gas data is based on 0.60 specific gravity.
Z223.1-2002/NFPA 54-2002 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1-05.

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii i i i !ii i i i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i! i!i

HEATING VALUE

at ALTITUDE

BTU/CU. FT.

2500

Orifice Size

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For fuels with different specific gravity consult the National Fuel Gas Code ANSI

LPG or PROPANE GAS MANIFOLD PRESSURE (" w.c.)

MEAN ELEVATION FEET ABOVE SEA LEVEL

0 to 2001 to 3001 to 4001 to 5001 to

2000 3000 4000 5000 6000

10.0 10.0 9.0 10.0 9.4
#54 #54 #54 #55 #55

6001 to 7001 to

7000 8000

8.5 10.0

#55 #56

NOTE: Propane data isbased on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1-2002/N FPA
54-2002 or National Standard Of Canada, Natural Gas And Propane Installation Code CSA B149.1-05.

NOTE: The derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design-certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 above sea level. Use

the 2001 to 3000 column in Table 6 and Table 7.
The burner orifice part nos. are as follows:

Orifice #41 1096942 Orifice #42 1011351
Orifice #43 1011377 Orifice #44 1011352
Orifice #45 1011353 Orifice #54 1011376
Orifice #55 1011354 Orifice #56 1011355

_ ; ;;; _ ;;;;;;; ;;;;;;;;;;;;;;;;;;2

High Altitude Air Pressure Switch

The factory-installed pressure switch need NOT be changed for
any furnace installations from sea level up to and including 8,000'

altitude

Changing Orifices

1. After disconnecting power and gas supply to the furnace, re-
move the burner compartment door, exposing the burner
compartment.

2. Disconnect gas line from gas valve so manifold can be re-
moved.

3. Disconnect wiring at gas valve. Be sure to note the proper
location of all electrical wiring before being disconnected.

4. Remove the four (4) screws holding the manifold and gas

valve to the manifold supports. Do not discard any screws.

See Figure 35.

Some Models may vary

25-25-00

Manifold

5. Carefully remove the manifold assembly.

6. Remove the orifices from the manifold and replace them with
proper sized orifices. See Figure 36.

7. Tighten orifices so they are seated and gas-tight. See
Figure 36.

8. Reassemble all parts in reverse order as removed. Be sure to
engage the main burner orifices in the proper openings in the
burners.

441 01 261302 [_

9. After reassembling, turn gas on and check all joints for gas
leaks using a soapy solution. All leaks must be repaired im-
mediately.

Clearances

Measure from face of orifice to the
batck side of the manifold,

29.3 +_11"5mm "\k,,..k--..,.,.r_j

LP Conversion

I An accessory kit shall be used to convert to propane gas use, see

the furnace rating plate for the LP conversion accessory kit part
number.

CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning can result in

death, property damage and/or personal

injury.
NOx inserts for use with Natural Gas units

ONLY. If LP Gas is required, NOx inserts must
be removed.

FIRE, EXPLOSION, UNIT DAMAGE HAZARD.
Failure to follow this warning can result in

death, property damage and/or personal

injury.

An LP conversion accessory kit is required
when operating the furnace with LP gas.

*8MPLs and N8MPLs contain NOx inserts.
For LP conversion remove screws that secure the NOx insert and

discard insert.

Reinstall screws. See Figure 37
NOTE: It is very important to reinstall the NOx insert mounting

screws.

Removing NOx inserts

25-40-03

Main Burner Flame Check

Allow the furnace to run approximately 10 minutes. Then inspect
the main burner flames. See Figure 38.

Check for the following:

• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yellow

tips.

• Flames extending directly from burner into heat exchanger.

• Flames do NOT touch sides of heat exchanger

If any problems with main burner flames are noted, it may be nec-
essary to adjust gas pressures or check for drafts.

Main Burner

10-10-78

NOTE: For Ignitor location see Figure 39.

441 01 261302

Ignitor Location

NOTE: Flame sensor has a different orientation in all 050 models.

Air TemperatureRise Check

REDUCED FURNACE LIFE HAZARD

Failure to properly set the air temperature rise may
result in reduced furnace life.

Use ONLY the blower motor speed taps marked "Y" for
YES for setting air temperature rise.

Blower Motor Speed Taps for

NSMPNtL and *8MPN/L Model Sizes

ModelSizes

050B12
075B12

075F16
100F14

100F20
100J20

100J22
125J20

125J22+
150J20{

+N8MPN only

LO

RED

N
N

N
N

N
N

Y
N

Y
N

{ _8MPNonly

M LO M HI HI

BLUE ORN BLK

Y Y N
Y Y Y

N Y Y
N Y Y

Y Y Y
Y Y Y

Y Y N
Y Y Y

Y Y Y
Y Y Y

The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate. Tempera-

ture rise is the difference between supply and return air tempera-
tures.

To check temperature rise, use the following procedure:

1. Place thermometers in supply and return air registers as close
to furnace as possible, avoiding direct radiant heat from heat

exchangers.

2. Operate furnace for 10 minutes with all the registers and duct

dampers open by using a jumper wire on R to W thermostat
connections on the fan board.

3,

4.

Take readings and compare with range specified on rating
plate.

If the air temperature rise is not in the correct range, the blow-

er speed must be changed. A higher blower speed will lower
the temperature rise. A lower blower speed will increase the
temperature rise.

5. Removethe ULU.m._erwire after the adiustments are complete.

441 01 261302

Changing Blower Speed

ELECTRICAL SHOCK HAZARD.
Failure to disconnect power could result in death,

personal injury and/or component damage.
Turn OFF power to furnace before changing speed

taps.

NOTE: The speed taps that the manufacturer sets at the factory
for this furnace are based on a nominal 400 CFM per ton cooling
and the basic mid range on the temperature rise for heating.

Since the manufacturer cannot predict the static pressure
that will be applied to the furnace, it is the responsibility of the

installer dealer/contractor to select the proper speed tap
leads for the application when the furnace is installed.

If it is necessary to change speeds, refer to steps below.

1. Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the electronic furnace con-
trol as well as location of unused blower motor speed leads.
Use the chart (Table 8 ) to determine the blower motor speed
settings.

I Blower Speed Chart

Wire Color Motor Speed

Black High

Orange* Med- High

Blue Med-Low

Red Low

* Med-High speed may not be provided on all models.

2. Change the heat or cool blower motor speed by removing the
motor speed lead from the "Heat" or "Cool" terminal and re-
place it with the desired motor speed lead from the "M1" or

"M2" location. Connect the wire previously removed from the
"Heat" or "Cool" terminal to the vacated "M1" or "M2" termi-

nal.

3. If the same speed must be used for both heating and cooling,
remove the undesired motor speed lead from the "Heat" or

"Cool" terminal and connect that lead to the open terminal at
"MI" or "M2" location or tape off. Attach a jumper between
the "Heat" and "Cool" terminals and the remaining motor

speed lead.
Note: When using the same speed on motors with (4) speed

leads, it will be necessary to tape off the terminal of the motor
speed lead removed from the "Heat" or "Cool" terminal with

electrical tape since an open terminal will not be available at
the "M1" or "M2" location.

Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of opera-

tion.

Continuous-Fan Operation using "G"

Energizing the"G" terminal on the furnace control provides contin-
uous fan operation. This is done by connecting the G terminal of

the thermostat to the G terminal on the furnace control. When the
FAN switch is turned from auto to ON the fan will operate continu-

ously at "HEAT" speed. EAC will be energized in this mode.

NOTE: In heating, the fan will turn off during furnace ignition and
warm up then restart at heating speed.

Hard Wired Continuous-Fan Operation

A terminal is provided on the furnace control board located in the
circulatinq, air blower compartment for operation of the continu-

ous-fanoption.Thisconnectionisintendedforthe low speed mo-

tor tap, and has a lower contact rating (8 amps) than the heat and
cool taps. When the low speed blower lead is connected to this
terminal, this will provide low speed blower operation whenever
the other two speeds (Heat or Cool) are not energized. EAC not

powered in this mode.

Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of opera-

tion.

Separate speed selections for Heat, Cool, and

13. Furnace Maintenance

Continuous-Fan

Connect low speed lead from circulating air motor to the "Cont"
terminal at the furnace control board. The appropriate motor leads
should already be connected to the "Heat" and "Cool" terminals.

Heating and Continuous-Fan Speed the Same

If it is necessary to operate the heating speed and continuous -fan
speed using the same blower speed, connect a jumper between

the "Heat" and "Cont" terminals on the furnace control board.

Note: There should be only ONE motor lead going to the "Heat"
and "Cont" terminals.

FIRE, EXPLOSION, OR CARBON MONOXIDE
POISONING HAZARDS

Failure to have the furnace inspected and
maintained could result in death, personal injury,

and/or property damage.
It is recommended that the furnace be inspected

and serviced on an annual basis (before the heating
season) by a qualified service agency.

See "User's Information Manual".

ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD

Failure to follow safety warnings exactly could
result in dangerous operation, death, personal
injury, or property damage.

Improper servicing could result in dangerous
operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical
power to furnace.

• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

_] 441 01 261302

14. Sequence of Operation & Diagnostics

The following is the normal operating sequence.

Cooling (¥) Request:

24VAC signals applied to Y & G terminals of FCB (furnace control board)

• Cool motor speed is energized after 5 second Cool Fan On Delay time.

Y & G signals removed from FCB

• Cool motor speed is de-energized after 90 second Cool Fan Off Delay time.

Continuous Circulating Fan (G) Request:

24 VAC signal is applied to G terminal of the FCB.

• Heat motor speed is energized without delay.

G signal removed from FCB.

• Heat motor speed is de-energized after 5 second delay.

NOTE 1) Furnace de-energizes the fan during the heat exchanger warm-up period on a call for Heating that occurs during a G request
unless a blower motor lead is connected to the Cont terminal on the FCB, in which case see NOTE 2).

NOTE 2) Heating or Cooling requests received during a Fan request cause the fan speed to change to the appropriate heat or cool
speed after the Fan on Delay time expires. The fan returns to continuous circulating speed after the selected Fan Off Delay time expires
following loss of the Heating or Cooling request.

Continuous Circulating Fan Hard-Wired (Cont) Request:

Field selected low speed motor tap installed on "CONT" terminal.

• Low speed is energized when power applied to furnace. Operates at this speed continuously while there are no other
blower demands from furnace control. Fan demands from furnace control for heat, cool or "G" will override hard-wired speed tap.

NOTE 3) EAC is NOT active for hard-wired mode but IS active for fan demands from furnace control for heat, cool and "G".

Heating (W) Request:

Heating (W) Request:

• 24 VAC signal applied to W terminal of FCB.

• Inducer motor turns on and the pressure switch(es) close(s).

• Following a 15 second prepurge delay after the pressure switches closes, the igniter begins a 17 second warm-up.

• The gas valve is energized, the main burners light and flame is sensed.

• The igniter is de-energized after the main burners ignite.

• FCB will delay blower operation for the 30 seconds timed from the opening of the gas valve.

W signal removed from FCB.

• The gas valve de-energizes and the main burners go out.

• The inducer runs for a 15 second postpurge period.

• The fan stays at Heat speed.

• The fan de-energizes after the selected Heat Fan Off Delay time expires, timed from the gas valve de-energizing.
HUMIDI FIE R - The 24V HUM is energized when the pressure switch closes on a call for heat. The 115V HUM (called HUM on Control)

is energized when the inducer is energized.

ELECTRONIC AIR CLEAN E R - EAC is energized when there is a blower speed call. It is NOT energized when blower operates in the
hard-wired continuous fan mode.

NOTE 4) If a new Heating request arrives while the control is waiting in the Heat Fan Off Delay time, the FCB will wait for the selected
Heat Fan Off Delay then start a new heating cycle as long as the heat call remains.

441 01 2613 02 [_

Heating Request with Gas Shut Off:

24 VAC signal applied to W terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours then try for ignition again as long as the heat call remains.

Power reset will clear lockout.

• Inducer motor turns on

• Following a 15 second prepurge delay, the igniter begins warm up.

• The igniter glows red-hot for 22 seconds, then turns off. The FCB flashes error code 6.

• The igniter stays off for 17 seconds, then begins to warm up again.

• The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.

• The igniter stays off for 17 seconds, then begins to warm up again.

• The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.

• The igniter stays off for 17 seconds, then begins to warm up again.

• The igniter glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout and stops flashing error code 6 and begins
flashing error code 6 + 1.

• The inducer motor de-energizes after a 15 second post purge.

Control Board Diagnostic Codes (See Figure 40)

OFF = 24VAC or 115VAC is off, fuse is open
Heartbeat = Normal operation or no previous Diagnostic Code

ON SOLID = Soft Lockout - Furnace Control Error (1 hr delay)

If code repeats immediately following power reset then replace control

1 Flash = Not used
2 Flashes = Pressure switch(es) closed when should be open

3 Flashes = Pressure switch open when should be closed
4 Flashes = Limit or roll-out switch open (less than 2 minutes)
5 Flashes = Flame sensed out of sequence
6 Flashes = Failure to ignite or flame sense lost while running

6 + 1 Flashes = Soft Lockout - Max trials for ignition reached (3hr delay)
7 Flashes = Soft Lockout - Limit or roll-out switch open longer than 2 minutes (1 hr delay)

(roll-out switch requires manual reset)

8 Flashes = Permanent Lockout - Gas valve relay contact stuck closed or miswired gas valve (power reset only)
10 Flashes = Line voltage (115VAC) polarity reversed. If twinned, refer to twinning kit instructions

* If status code recall is needed, briefly (2-3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored
status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared
after 72 hours or upon power reset.

* Proper flame sense microamps: 0.7 microamps D.C. minimum 2.0 - 4.0 microamps nominal

Control Board

441 01 261302

II I I ® I

Save This Manual For Future Reference

N8MPN050B12B1

N8MPN075B12B1

N8MPN075F16B1

N8MPN100F14B1

N8MPN100F20B1
N8MPN100J22B1
N8MPN125J20B1
N8MPN125J22B1

*8MPN050B12B1
*8MPN075B12B1
*8MPN075F16B1
*8MPN 100F14B1
*8MPN100F20B1
*8MPN100J20B1
*8MPN125J20B1
*8MPN 150J20B1

* Denotes Brand

Models

N8MPL050B12B1
N8MPL075B12B1
N8MPL075F16B1
N8MPL100F20B1
N8MPL100J22B1
N8MPL125J20B1
N8MPL125J22B1

*8MPL050B12B1
*8MPL075B12B1
*8MPL075F16B1
*8MPL100F20B1
*8MPL100J20B1
*8MPL125J20B1

International Comfort Products, LL C
Lewisburg, TN 37091

Fast Parts Division

[phone]

441 01 2613 02

ManufacturersNumber (Mfr No -See RatingPlate)
ALL Models(N8MPN)

Specifications

N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN
050B12 075B12 075F16 100F14 100F20 100J22 125J20 125J22

General

Input(Btuh) 50,000 75,000 75,000 100,000 100,000 100,000 125,000 125,000

Output(Btuh) 40,000 60,000 60,000 80,000 80,000 80,000 100,000 100,000
Temp.Rise(F) 35-65 35-65 25-55 30-60 35-65 30-60 30-60 30-60

Electrical(Volts/Hz) 115/60 115/60 115/60 115/60 115/60 115/60 115/60 115/60
RatingPlateAmps. 9.7 9.2 9.7 8.9 11.7 13.2 11.7 13.2

GasType NatI LPNatI LPNatI NatI NatI NatI NatI LPNatI

Transformer Size (VA) 40
T'stat Heat Anticipator .50

Gas &Ignition

Std. MainOrifices(No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 41#42 4/#54 41#42 4/#54 4/#42 4/#54 5/#42 5/#54 5/#42 5/#54
GasValveHoneywell VR82055

RegulationType SNAP

Manifold Press.(Inch'sWC) 3.5 I 10.0 3.5 I 10.0 3.5 1810.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0

IgnitionTypelSeries HotSurface

Combustion

FlueOutlet Size(Inches) 4 4 4 4 4 4 4 4
Limits & Controls

ThermalSensor (F) 300 300 300 300 300 300 300 300

LimitControl See PartsList SeePartsList See PartsList See PartsList See PartsList See PartsList See PartsList See PartsList

Std. PressureSw.(PartNo) 1013529 1013529 1013529 1013520 1013520 1013529 1013529 1013529

Press(Close) -0.69 -0.69 -0.69 -0.69 -0.69 -0.69 -0.69 -0.69
Press(Open) -0.59 -0.59 -0.59 -0.59 -0.59 -0.59 -0.59 -0.59

FurnaceControl(Type) Integrated
FurnaceControl On 30

(Timed-secs) Off 60,100,140,180
Blower Data

Type&Size 11-8 11-8 11-10 11-10 11-10 11-10 11-10 11-10
MotorTypelH.p. PSC/I/2 PSC/I/2 PSCII/2 PSC/I/2 PSC/I/2 PSC/3/4 PSC/I/2 PSC/3/4

Cap.MfdNults 10/370 7.5/370 10/370 7.5/370 10/370 40/370 10/370 40/370

FilterType(600 FPM) Washable Washable Washable Washable Washable Washable Washable Washable
FilterSize (") (NotSupplied) 14x25x1 14x25x1 16x25x1 16x25x1 16x25x1(2) 20x25x1 20x25x1 20x25x1

1600CFMandover# .... 16x25x1(2) -- 16x25x1(2) 16x25x1(2) 16x25x1(2) 16x25x1(2)

Min. CoolCap.(Tons) 1.5 1.5 3 2 3 3 3 3
Max. CoolCap.(Tons) 3 3 4 3.5 5 5.5 5 5.5

Gas Conversion Kits

Natto LP NAHAO01LP(1172958_)
LPto Nat NAHAOO1NG(1172960_)

Mustbeorderedfrom ServiceParts

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44101261302

ManufacturersNumber (Mfr No -See RatingPlate)
ALL Models(N8MPL)

Specifications

N8MPL N8MPL N8MPL N8MPL N8MPL N8MPL N8MPL

O5OB12 O75B12 O75F16 1OOF20 1OOJ22 125J20 125J22

General

Input(Btuh) 50,000 75,000 75,000 100,000 100,000 125,000 125,000

Output(Btuh) 40,000 60,000 60,000 80,000 80,000 100,000 100,000
Temp.Rise(F) 35-65 35-65 25-55 35-65 30-60 30-60 30-60

Electrical(VoltslHz) 115160 115160 115160 115160 115160 115160 115160
RatingPlateAmps. 9.7 9.2 9.7 11.7 13.2 11.7 13.2

OasType .atI LP .atI LP .at .at .at .at .atI LP

Transformer Size (VA) 40
T'stat Heat Anticipator .50

Gas &Ignition

Std. MainOrifices(No/Size) 2I#42 2I#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54 5I#42 5/#54
GasValveHoneywell VR82055

RegulationType SNAP

Manifold Press.(Inch'sWC) 3.5 110.0 3.5 110.0I 35 110.0 3.5 110.0 I 35 110.0 35 110.0 3.5 110.0

IgnitionType/Series Hot Surface

Combustion

FlueOutlet Size(Inches) 4 4 4 4 4 4 4

Limits&Controls

ThermalSensor (F) 300 300 300 300 300 300 300

LimitControl See PartsList SeePartsList See PartsList SeeParts List SeeParts List See PartsList See Parts List

Std. PressureSw.(PartNo) 1013529 1013529 1013529 1013529 1013529 1013529 1013529

Press(Close) -0.69 -0.69 -0.69 -0.69 -0.69 -0.69 -0.69

Press(Open) -0.59 -0.59 -0.59 -0.59 -0.59 -0.59 -0.59

FurnaceControl(Type) Integrated
FurnaceControl On 30

(Timed-secs) Off 60,100,140,180
Blower Data

Type&Size 11-8 11-8 11-10 11-10 11-10 11-10 11-10
MotorType/H.p. PSC/II2 PSC/I/2 PSC/I/2 PSC/II2 PSC/3/4 PSC/I/2 PSC/314

Cap.MfdNolts 10/370 7.51370 10/370 10/370 40/370 10/370 40/370

FilterType(600 FPM) Washable Washable Washable Washable Washable Washable Washable
FUterSize(") (NotSupplied) 14x25x1 14x25x1 16x25x1 16x25x1 20x25x1 20x25x1 20x25x1

1600CFMand over # .... 16x25x1(2) 16x25x1(2) 16x25x1(2) 16x25x1(2) 16x25x1(2)

Min. CoolCap.(Tons) 1.5 1.5 3 3 3 3 3
Max. CoolCap.(Tons) 3 3 4 5 5.5 5 5.5

Gas Conversion Kits

Natto LP NAHA001LP(1172958")
LPto Nat NAHA001NG(1172960")

* MustbeorderedfromServiceParts

441ol 261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1

ManufacturersNumber (Mfr No -See RatingPlate)
ALL Models(*8MPN)

Specifications

*8MPN *8MPN *8MPN *8MPN *8MPN *8MPN *8MPN *8MPN

050B12 075B12 075F16 100F14 100F20 100J20 125J20 150J20

General

Input(Btuh) 50,000 75,000 75,000 100,000 100,000 100,000 125,000 150,000

Output(Btuh) 40,000 60,000 60,000 81,000 81,000 81,000 101,000 121,000
Temp.Rise(F) 35-65 30-60 30-60 35-65 35-65 35-65 35-65 35-65

Electrical(Volts/Hz) 115/60 115/60 115/60 115/60 115/60 115/60 115/60 115/60
RatingPlateAmps. 9.7 9.0 9.7 9.2 12.0 12.0 12.0 13.5

GasZype NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP

Transformer Size (VA) 40
T'statHeat Anticipator .50

Gas &Ignition
Std. MainOrifices(No/Size) 2t#42 2I#54 3/#42 3/#54 3/#42 3/#54 4I#42 4/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54 6/#42 6/#54

GasValveHoneywell VR82055

RegulationType SNAP

Manifold Press.(Inch'sWC) 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0 3.5 I 10.0

IgnitionTypelSeries HotSurface

Combustion

FlueOutlet Size(Inches) 4 4 4 4 4 4 4 4
Limits & Controls

ThermalSensor (F) 300 300 300 300 300 300 300 300

LimitControl See PartsList SeePartsList See PartsList See PartsList See PartsList SeePartsList SeePartsList SeePartsList

AuxiliaryLimit (F) 130 130 130 130 130 130 130 130
Std. PressureSw.(PartNo) 1013529 1013529 1013529 1013529 1013529 1013529 1013529 1013529

Press(Close) -0.69 -0.69 -0.69 -0.69 -0.69 -0.69 -0.69 -0.69

Press(Open) -0.59 -0.59 -0.59 -0.59 -0.59 -0.59 -0.59 -0.59

FurnaceControl(Type) Integrated
FurnaceControl On 30

(Timed-secs) Off 60,100,140,180
Blower Data

Type&Size 11-8 11-8 11-10 11-10 11-10 11-10 11-10 12-12
MotorTypelH.p. PSC/I/2 PSC/I/2 PSCII/2 PSC/I/2 PSCII/2 PSC/I/2 PSC/I/2 PSCI3/4

Cap.MfdNolts 10/370 7.51370 10/370 7.5/370 10/370 10/370 10/370 40/370

FilterType(600 FPM) Washable Washable Washable Washable Washable Washable Washable Washable
FilterSize (") (NotSupplies) 14x25x1 14x25x1 16x25x1 16x25x1 16x25x1 20x25x1 20x25x1 20x25x1

1600CFMandover# .... 16x25x1(2) -- 16x25x1(2) 16x25x1(2) 16x25x1(2) 16x25x1(2)

Min. CoolCap.(Tons) 1.5 1.5 3 2 3 3 3 3
Max. CoolCap.(Tons) 3 3 4 3.5 5 5 5 5

Gas Conversion Kits

Natto LP NAHAOO1LP(1172958")
LPto Nat NAHAOO1NG(1172960")

* MustbeorderedfromServiceParts

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44101261302

ManufacturersNumber (Mfr No -See RatingPlate)
ALL Models(*8MPL)

Specifications

*8MPL *8MPL *8MPL *8MPL *8MPL *8MPL

050B12 075B12 075F16 100F20 100J20 125J20

General

Input(Btuh) 50,000 75,000 75,000 100,000 100,000 125,000

Output(Btuh) 40,000 60,000 60,000 81,000 81,000 101,000
Temp.Rise(F) 35-65 30-60 30-60 35-65 35-65 35-65

Electrical(VoltslHz) 115160 115160 115160 115160 115160 115160
RatingPlateAmps. 9.7 9.0 9.7 12.0 12.0 12.0

OasType .atl,P .atI LP .atI LP .atl'P .atl_P .atl_P

Transformer Size (VA) 40
T'statHeatAnticipator .50

Gas &Ignition
Std. MainOrifices(NolSize) 21#42 21#54 31#42 31#54 31#42 31#54 41#42 41#54 41#42 41#54 51#42 51#54

GasValveHoneywell VR82055

RegulationType SNAP

Mao,o,dPress._,och'sWC_3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0

IgnitionType HotSurface

Combustion

FlueOutlet Size(Inches) 4 4 4 4 4 4
Limits & Controls

ThermalSensor (F) 300 300 300 300 300 300

LimitControl SeePartsList See PartsList See PartsList See PartsList SeeParts List See PartsList

AuxiliaryLimit (F) 130 130 130 130 130 130
Std. PressureSw.(PartNo) 1013529 1013529 1013529 1013529 1013529 1013529

Press(Close) -0.69 -0.69 -0.69 -0.69 -0.69 -0.69
Press(Open) -0.59 -0.59 -0.59 -0.59 -0.59 -0.59

FurnaceControl(Type) Integrated
FurnaceControl Ondelay 30

(Timed-secs) Offdelay 60,100,140,180
Blower Data

Type&Size 11-8 11-8 11-10 11-10 11-10 11-10
MotorAmpslRpm I 0.311100 811050 I 0.311100 1011050 11.91900 1011050

MotorTypelH.p. PSCIII2 PSClII2 PSCIII2 PSCIII2 PSCIII2 PSCIII2
Cap.MfdNolts 10/370 7.5/370 10/370 10/370 10/370 10/370

FilterType Washable Washable Washable Washable Washable Washable
FUterSize(") (NotSupplied) 14x25x1 14x25x1 16x25x1 16x25x1 20x25x1 20x25x1

1600CFMand over# .... 16x25x1(2) 16x25x1(2) 16x25x1(2) 16x25x1(2)

Min. CoolCap.(Tons) 1.5 1.5 3 3 3 3
Max. CoolCap.(Tons) 3 3 4 5 5 5

Gas Conversion Kits

Natto LP NAHA001LP(1172958")
LPto Nat NAHA001NG(1172960")

* MustbeorderedfromServiceParts

441Ol261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1

15. Circulation Air Blower Data (CFM)

1 N8MPN/L050B12& *8MPN/L050B12(1) • DenotesBrand 1N8MPN/L100F20 & *8MPN/L100F20(2)(4)• DenotesBrand

Air Delivery in Cubic Feet per Minute (C,F.M.)

= (Furnace Rated @0.5" WC ESP)

O TAP LOW MED L MED H HIGH
_ ,10 472 704 1167 1387

,9

_o ,30 365 638 1102 1288

_ .50 290 572 1035 1194

E _ .70 209 522 939 1070

.90 --- 443 820 937

1.00 --- 370 753 858

Air Delivery in Cubic Feet per Minute (C.F.M,)

(Furnace Rated @0.5" WC ESP)

u_

TAP LOW MED L MED H HIGH

•_ O' .10 831 1125 1582 2216

'-£ .30 814 1123 1588 2179
To

_ .50 781 1117 1577 2074
=u .70 717 1053 1541 1909

.90 609 964 1373 1745

×

ua 1.00 561 888 1307 1641

1 N8MPN/L075B12&*8MPN/L075B12(1) * Denotes Brand

Air Delivery in Cubic Feet per Minute (C,F.M.)

'_ (Furnace Rated @0.5" WC ESP)

u_

.: TAP LOW MED L MED H HIGH

_- ;_ ,10 695 963 1220 1559

C,_.£

_o ,30 644 928 1183 1463

,,, ,50 588 873 1118 1361

= = .70 540 771 1017 1239

.90 463 675 900 1083

uJ 1.00 413 615 835 998

1 N8MPN/L100J22(2)

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5" WC ESP)

TAP LOW MED L MED H HIGH

_ .10 1785 1997 2292 2519

'£ .30 1741 1941 2206 2410
To

_ .50 1674 1861 2097 2284
_ .70 1581 1749 1965 2121

--
.90 1428 1597 1793 1928

w 1,00 1326 1478 1667 1814

1 N8MPN/L075F16&*8MPN/L075F16(1)(3)* DenotesBrand

Air Delivery in Cubic Feet per Minute (C,F.M.)

(Furnace Rated @0.5" WC ESP)

u_

. TAP LOW MED L MED H HIGH

,10 598 841 1427 1861

o ,30 400 748 1384 1770
_ ,50 289 667 1343 1677

F _ .70 236 582 1254 1547

.90 --- 477 1129 1360

ua 1.00 --- 436 1016 1262

1 *8MPN/L100J20(2) _ Denotes Brand

Air Delivery in Cubic Feet per Minute (C.F.M.)

= (Furnace Rated @0.5" WC ESP)

TAP LOW MED L MED H HIGH

_d

_ .10 773 1045 1453 2147
C

'_ o .30 755 1037 1469 2128

_ .50 712 1020 1459 2078
_ .70 647 979 1424 1963

--
.90 554 894 1347 1795

1,00 497 828 1262 1705

1 N8MPN100F14& *8MPN100F14(1)_ Denotes Brand

p Air Delivery in Cubic Feet per Minute (C,F.M.)

= (Furnace Rated @0.5" WC ESP)

u_

. TAP LOW MED L MED H HIGH

,10 770 949 1328 1760

•_ o ,30 648 873 1235 1675
_ .50 544 772 1115 1551

,= _ .70 457 684 1036 1404

.90 361 572 895 1215

ua 1.00 308 507 811 1093

1 N8MPN/L125J20& *8MPN/L125J20(2)(5) *DenotesBrand

Air Delivery in Cubic Feet per Minute (C.F.M,)

= (Furnace Rated @0.5" WC ESP)

_ TAP LOW MED L MED H HIGH
_ .10 880 1149 1666 2147

,9 C

o .30 836 1158 1577 2126
_ .50 805 1140 1561 2148

_ .70 758 1081 1516 1922

--
.90 661 1009 1428 1767

×

1.00 614 925 1357 1663

I IIMAxO Ms

Filter Size CFM

14" X 25" 1400
16" X 25" 1600
20" X 25" 2000
24" X 25" 2500

Max CFM based on 600 FPM

I # CFM - Cubic feet per minute airflow.

Filter required for each return-air inlet. Airflow performance includes 1" washable (600 FPM max) filter media.

NOTE: (1) Data based on Bottom Only or One Side return.

(2) Data based on Both Sides or Bottom plus One Side
(3) 075F16 Reduce airflow by 5% if Bottom Only return.

(4) 100F20 Reduce airflow by 10% if Bottom Only return.
(5) 125J20 Reduce airflow by 5% if Bottom Only return.
(6) 125J22 Reduce airflow by 10% if Bottom Only return.
(7) 150J20 Reduce airflow by 10% if Bottom Only return.

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44_01261302

Circulation Air Blower Data Continued

• N8MPN/L125J22(2)(6)

Air Delivery in Cubic Feet per Minute (C.F.M.)

= (Furnace Rated @0.5" WC ESP)

O TAP LOW MED L MED H HIGH
_ ,10 1901 2121 2362 2463

,£
_o ,30 1833 2033 2244 2385

,50 1745 1936 2100 2217

E _ .70 1624 1773 1894 2033

.90 1442 1569 1714 1821

1.00 1329 1455 1583 1685

_ISMPN150J20(2)(7)* DenotesBrand

p Air Delivery in Cubic Feet per Minute (C.F.M,)

= (Furnace Rated @0.5" WC ESP)

u_
u_

._ t; TAP LOW MED L MED H

a. ;_ .10 1656 1915 2168

,u T..

o .30 1583 1787 2090

_.c_"_ _ .50 1507 1697 1997

_ .70 1390 1596 1856

_4 .90 1212 1445 1654
×

uJ 1.00 1125 1337 1561

HIGH

2385
2335

2212
2085

1898
1777

I IIMAxO Ms

Filter Size CFM

14" X 25" 1400
16" X 25" 1600
20" X 25" 2000
24" X 25" 2500

Max CFM based on 600 FPM

• Filter required for each return-air inlet. Airflow performance includes 1" washable (600 FPM max) filter media.

NOTE: (1) Data based on Bottom Only or One Side return.

(2) Data based on Both Sides or Bottom plus One Side
(3) 075F16 Reduce airflow by 5% if Bottom Only return.

(4) 100F20 Reduce airflow by 10% if Bottom Only return,
(5) 125J20 Reduce airflow by 5% if Bottom Only return.
(6) 125J22 Reduce airflow by 10% if Bottom Only return,

(7) 150J20 Reduce airflow by 10% if Bottom Only return,

44101261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1

+ +

WARNING: ELECTRICAL SHOCK HAZARD It'

CONNECTION DIAGRAM DISCONNECTBEFORESERVICING LADDER DIAGRAM zoo _.

m _OO

ROLLOUTSWITCH+TO2 > +40 0

TO 115VAC FIELD DISCONNECT

INSERIESDEPENDING LPPRESSURE . . COPPER CONDUCTORS C) rr

ONMODEL MAIN LIMIT BVSS SWTCH CAPACITOR ONLY J[ HOT NOTE#2 • */_7 EQUIPMENT GROUND Oo O

_i R __R 2 (WHEN USED) (WHEN USED) (SOME MODELS' 1_ i_ NEUTRAL 0 + Z qlZ

--R R-- -@ HOT END.,ERLOC.' O=O.

--o -- -_ • ,EUTRALI L SWITCH ' _U3_ Pml_l _

f_._ °. / I--£g%RESSURESW,TCHY _ GNTER" I+" I ,,OUCER N 211o. II,DU_ER%I_.ICAPACITORa_" o_

I ,,V,'1%I_°L'_I I Y +TO2mSEnmS /INDUCERG_RNMI'irin "1 Iv I RELAY P2 I I'" I MOTOR1 ITI(sON1EMODELs) 3: 03003

\ ..... /IMVI'_GRNA''I--P 'l DEPENDINGONMODEL_ MOTOR j_ JlIU[ BK I == _ETI2 II,.I k. / IOI . _ rn_ Z

........... _ - o , +,__:_ _ ._ _ o_,

PS NOITIEI3II I --W_SE"SOR "_¢ ' ' 'Z I I'I_',T_°Ntl NOTE#13 r_2.

--@:: 4-q, l II I_ 1 + _]GNITER II

--- W TE#13 _ I_

[ 24vAcL_coMIII "_ / B.W/_I _I]Hu_ "1*_4_-_ " ++o

- BK LO (R) I -- -

I RED ,LUE II I .s, _..--. . i /'1" - '+'11 HEAT/COOL M2_I_ I-- *]I

I . II I NDIF:'.-' ' 2 I _ ' JUNCTION RELAY-- HEAT_IMHI(O/_ ._I _1

I° .....'%... II I "_ LBK,_I'_I ;_ _, _ox I _ -" / "k"---J_?_ +, 0

III, _ MLO BL _ -< 60SEC

x 3: _ -0 MI PSC >

_ _ BLOWER #,

W BLOWER •

I_=_'_ O__ III L,_. i B. T I RELAY I" • _'X _ N
I_ _ _ II I _ _g I B._ I _E_C _ _ I .

= °'_ ] I-_ rNI + _ BR _11 CONT FAN N + _ rM__-_ C

I _[-_-r _ ___ _L_ . / q r_ w _ I 'II ' - (OPT) _ I _>_

1.1_ +++,,_+_,,,. FtfFll+~-B.=. _ _-+_ I ,.SER,ESDE'_E.°,.+ TR_R C

k _'_ .... H_OL + _ I _--_ONMODEL_ PI_FUSESA_";" L (

W _ _ I _ MA_LIMIT II NOT[_ _4VA_ _O_ _ _

-- --R -- -- __ ...... P14 1TO21NSERIES ' m_l_Q1

w I_ ____N _ER/E_DEL _ _ _ 1.

1. Ifanyoftheoriginalequipmentwireisreplacedusewirerated 105°C. SPEEDTAP CODE COLOR CODE - - .... -I -< - -

HUM 24VAC 140SEC

2. Useonlycopperwirebetweenfl]edisconnectswitchandthefumace .... --L-- P1 10

- I.unctJonbox BLAC K BK i LP PRESS SWITCH

_.. . •.... BLAC. ., BLOE BL II , I .=;L:_I/' _[+'_;DELSONL'D'

3. to furnace sheet metal for control to

..is wire mus, _e connec,e_ w . _ I

., ORANGE MHI BROWN BR _ I P+8 NOTE#8

provename. BLUE MLO GREEN/YELLOWGRN/YII '_=_ \ _ ......

4. Symbols are electrical representation only. I \ L_

ORANGE O GAS L ........ I

5. Solid lines inside circuit board are printed circuJt board traces and are RED LO RED R VALVE P1 2 _ I O J1

not depicted as shown in the legend.

WHITE W y CPU RELAY BV_ -- ' mm 100 18

6. Replaceonlywitha5ampfuse. YELLOW Y I I _._ __) (FIELDINSTALLED) E_ IBBI

7. Slower motor speed selec(Jons are for average conditions, see _ m J

installation instructions for detail .... pti ........ peed selection. . ' ' J I _ I r 0 140

8. Factory connected when LP Pressure Switch and BVSS (Chimney -- LOW VOLTAGE FACTORY _ -- I P1 ;7 _--_ 80 SEC

Adapter A....... yKit) ...... t instal!ed. ' vAGASE )_

..... ' +"-IT

9. Blower ofFdelay, gas heating selec_ons are (60, i00, 140, and 180) LOW VOLTAGE FIELD
seconds, cooling or heat pump 90 seconds. _ z r_ _ p

LINE VOLTAGE FACTORY oS- = // ** NOTE #3

10. Ignition lockout will occur after four consecutive unsuccessful trials for LINE VOLTAGE F IE LD
ignition. Controlwillauto-reset after three hours. __ _ _ _ | ,I_)P1 3 SENSOR

CONDUCTOR ON CONTROL

11. Blower motor and inducer motor contain internal auto-reset thermal -- _o_ ,1_) P1 1 NOTE #12
overload switch es. JU NC T IO N

O UNMARKED TERMINAL I _" I.

12. Flame sensor: 0.7 RA D.C. minimum, 2.0 - 4.0 pA nominal. _ IICONTROL BOARD I_,P1 9

13. Depending on model, P4 inducer motor leads may be in a single connector

or b,_._oquick connecters. CONTR OL TE R MI NAL 330709-101 REV,B

2

Partsfor N8MPN/L

16

\

17

\

u

AA

S

2

H

6

F

E

3

4

25-25-09

441 01 2613 02 [_

[ Replacement Parts - N8MPN (NaturalGas) I

Models - N8MPNO50B12B1, NSMPNO75B12B1, N8MPNO75F16B1, NSMPN100F14B1, N8MPNIOOF2OB1, N8MPNlOOJ22B1,
NSMPN125J20B1, NSMPN125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

NSMPN

Key Description Part I I

No. Functional Parts Number 050B 075B 075F 100F 100F 100J 125J 125J

12B1 12B1 16B1 14B1 20B1 22B1 20B1 22B1

I Heat Exchanger I

I

2 Switch, Pressure
3 Wheel, Blower

4 Mount, Motor kit*

5 Mtr, Blor 1/115 1/2 CCW

1/115 1/2 CCW
1/115 1/2 CCW
1/115 3/4 CCW

6 Capacitor, 7.5 Mfd/370V

10 Mfd/370V

40 Mfd/370V

7 Transformer
8 Control
9 Switch, Interlock

10 Burner Assembly

11 Flame Sensor
12 Ignitor

14 Orifice, Burner # 42
15 Valve, Gas

16 Switch, Limit (Rollout)
17 Switch, Limit (Main)

18 Blower, Combustion

(Inducer)

1013623
1013624
1013625
1013626
1013627
1013628

1013529
1013011

1011420
1014824

1014823
1014822

1172490
1172487
1172488
1172489

1171728
1171729
1171982

1172810
1172550

1171981
1172884

1172965
1172966

1172967
1172827
1172533
1011351
1172821

1013102
1008417

1320362

34335000

1014433
1013517

1
1

1
1

1
1

1
1
2
1

2

1
1

1

1

1
1

1

1
1
3
1

2

1

1

1
1

1
1

1

1
1
3
1

2

1
1

1

1

1

1

1

1

1
1

1

1
1

4

1

2

1

1

1

1

1

1
1

1

1
1
4
1

2
1

1

1

1

1

1
1
1

1

1
1
4
1

2

*See Table below for bellyband location on motor

Bellyband Location

on Motor

ModeIN8MPN A(in.)
050B12B1 1.38"

075B12B1 1.38"
075F16B1 1.38"
100F14B1 1.38"

100F20B1 1.81"
100J22B1 1.65"
125J20B1 1.81"

125J22B1 1.65"

1
1

1

1

1
1

1

1
1
1
5
1

2

1

1

1
1

1

1

1
1
1

1

1
1
1
5
1

2

441 01 2613 02

[ Replacement Parts - N8MPN (NaturalGas)

Models - N8MPN050B12B1, NSMPN075B12B1, N8MPN075F16B1, NSMPN100F14B1, N8MPN100F20B1, N8MPN100J22B1,
N8MPN125J20B1, NSMPN125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

N8MPN

Key Description Part I I I

No. Non- FunctionalParts Number 050B 075B 075F IOOF IOOF lOOJ 125J 125J

12B1 12B1 16B1 14B1 20B1 22B1 20B1 22B1

A Panel,Top 1013995 1 1

1013996 1 1 1 -
1013997 1 1 1

B Box,Junction 1172860 1 1 1 1 1 1 1 1
C Cover,Junctionbox 1012350 1 1 1 1 1 1 1 1

D Partition,Blower 1014009 1 1

1014010 1 1 1 -

1014011 1 1 1

E Housing,Blower 1172885 1 1

1172969 1 1 1 1 1 1

F Hanger,Blower 1012328 2 2 2 2 2 2 2 2

G Panel,BlowerCutoff 721020013 1 1

721020008 1 1 1 1 1 1

H Clamp,Capacitor 1170643 1 1 1 1 1 1

1014315 1 - 1

J Bracket,ControlMounting 1172845 1 1 1 1 1 1 1 1
L Door,Blower 1172991 1 1

1172993 1 1 1 -
1172995 1 1 1

M Bracket,Door 1172231 1 1

1172232 1 1 1 -
1172233 1 1 1

N Door,Louver 1172603 1 1

1173000 1 1 1 -
1173001 1 1 1

P Manifold,Gas 1012787 1

1012788 1 1
1012789 1 1 1 -
1012790 1 1

S Bracket,ManifoldSupport 1012377 2 2 2 2 2 2 2 2
T Top,BurnerBox 1014480 1 1 1

1014481 1 1 1 -
1014482 1 1

U Bracket,Burner BoxSides 1012532 2 2 2 2 2 2 2 2
V Baffle,BurnerBox 1012338 1 1 1

1012339 1 1 1 -
1012340 1 1

W Bottom,BurnerBox 1172847 1

1172848 1 1
1172849 1 1 1 -
1172850 1 1

X CollectorBox 1013010 1

1012735 1
1012736 1 -
1012739 1 1 -
1012738 1 -
1012740 1 1

1013540 1 1 1 1 1 1 1 1

Z Gasket, Combustion Blower

I

441 01 2613 02 [_

[ Replacement Parts - N8MPN (NaturalGas)

Models - N8MPNO50B12B1, NSMPNO75B12B1, N8MPNO75F16B1, NSMPN100F14B1, N8MPNIOOF2OB1, N8MPNlOOJ22B1,
N8MPN125J20B1, NSMPN125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

N8MPN

Key Description Part I I I

No. Non- FunctionalParts Number 050B 075B 075F IOOF 100F 100J 125J 125J

12B1 12B1 16B1 14B1 20B1 22B1 20A1 22A1

AA Partition,Frt Ht Exchanger 1013780 1

1013781 1
1013782 1 -

1013783 1 1 -
1013784 1 -
1013785 1 1

BB Gaskets,HeatExchanger 1013991 2

1013992 2 2
1013993 2 2 2 -

1013994 2 2

CC Tubing, Silicone 1172192 1 1 1 1 1 1 1 1

LL Sightglass 1172768 1 1 1 1 1 1 1 1

)( PartsNot Illustrated
)( Fuse,5 Amp 1083348 1 1 1 1 1 1 1 1
)( Harness,Wire 1172811 1 1 1

1172812 1 1 1 1 1

44101261302 1 1 1 1 1 1 1 1

44102201100 1 1 1 1 1 1 1 1

)( Manual,Installation&Tech
)( Manual,Users

GasConversion Kits
Natto LP NAHA001LP(1172958)

LPto Nat NAHA001NG(1172960")

MustbeorderedfromServiceParts

I

441 01 2613 02

[ Replacement Parts - N8MPL (NaturalGas) I

Models - N8MPLO50B12B1, N8MPLO75B12B1, N8MPLO75F16B1, N8MPLIOOF2OB1, N8MPL100J22B1, NSMPL125J20B1,
N8MPL125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Description Part N8MPL

No. Functional Number 075F16B1 100F20B1 100J22B1 125J20B1 125J22B1

Heat Exchanger

2 Switch, Pressure
3 Wheel, Blower

4 Mount, Motor kit*

Mtr, Blower 1/115 1/2 COW

1/115 1/2 CCW
1/115 1/2 COW

1/115 3/4 COW

Capacitor, 7.5 Mfd/370V

10 Mfd/370V

40 MFD/370V

7 Transformer
8 Control

9 Switch, Interlock

10 Burner Assembly

11 Flame Sensor
12 Ignitor

14 Orifice, Burner # 42
15 Valve, Gas

16 Switch, Limit (Rollout)
17 Switch, Limit (Main)

18 Blower, Combustion

(Inducer)

1014322
1014323
1014324
1014325
1014326

1014327
1013529

1013011
1011420

1014824
1014823
1014822

1172490
1172487
1172488

1172489
1171728

1171729
1171982

1172810
1172550

1171981
1172884

1172965
1172966

1172967
1172827
1172533

1011351
1172821

1013102
1008417

1320362

34335000

1013517
1014433

050B12B1

1

1
1

1
1

1
1

1
1

2
1

2

075B12B1

1

1
1

1
1

1

1
1

3
1

2

1

1

1
1

1
1

1

1
1

3

1

2

1

1

1

1

1

1
1

1

1
1

4
1

2
1

1

1

1

1

1
1

1
1

1
1

4
1

2

1
1

1

1

1
1

1

1
1
1

5
1

2

1
1

1
1

1

1

1
1

1
1

1
1
1

5
1

2

*See Table below for bellyband location on motor

Bellyband Location

on Motor

Model N8MPL A(in.)
050B12B1 1.38"

075B12B1 1.38"
075F16B1 1.38"

100F20B1 1.81"
100J22B1 1.65"

125J20B1 181"
125J22B1 1.65"

441 01 2613 02 [_

[ Replacement Parts - N8MPL (NaturalGas) I

Models - N8MPLO50B12B1, NSMPLO75B12B1, N8MPLO75F16B1, NSMPLIOOF2OB1, N8MPLIOOJ2OB1, N8MPL100J22B1,
N8MPL125J20B1, NSMPL125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Part
No. Number 075B lOOJ 125J 125J

12B1 22B1 20B1 22B1

A 1

Description

Functional

Panel, Top

B Box, Junction
C Cover, Junction box

D Partition, Blower

E Housing, Blower

F Hanger, Blower

G Panel, Blower Cutoff

t4 Clamp, Capacitor

J Bracket, Control Mounting

L Door, Blower

M Bracket, Door

N Door, Louver

P Manifold, Gas

S Bracket, Manifold Support
T Top, Burner Box

U Bracket, Burner Box Sides
V Baffle, Burner Box

W Bottom, Burner Box

Collector Box

Z Gasket, Combustion Blower

1013995
1013996
1013997

1172860

1012350
1014009

1014010

1014011
1172885

1172969

1012328

721020013
721020008

1170643

1014315

1172845
1172991

1172993
1172995

1172231
1172232

1172233
1172603

1173000
1173001

1012787
1012788

1012789
1012790

1012377
1013702

1013703
1013704

1012532
1012338

1012339
1012340

1172847
1172848

1172849
1172850

1013010
1012735
1012736
1012739
1012738
1012740

1013540

050B

12B1

1

1
1

1

1

2
1

1

1
1

1

1

1

2
1

2
1

1

1

1

1
1

1

1

2
1

1

1
1

2
1

2
1

075F
16B1

1

1
1

1

1
2

1
1

2
1

2
1

N8MPL

IOOF

20B1

1

1
1

1

1
2

1
1

1

2

1

2

1

1

1

1
1
1

1

1

2

1

1
1

1

2

1

2

1

1

1

1
1
1

1

1
2

1
1

1

1
2

1
2

1
1

1
1
1

1

1

2

1

1
1

1

2

1

2

1
1

_] 441 01 261302

[ Replacement Parts - N8MPL (NaturalGas) I

Models - N8MPLO50B12B1, NSMPLO75B12B1, N8MPLO75F16B1, NSMPLIOOF2OB1, N8MPLIOOJ2OB1, N8MPL100J22B1,
N8MPL125J20B1, NSMPL125J22B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

NSMPL

Key Description Part I I

No. Functional Number 075B 075F IOOF lOOJ 125J 125J

12B1 16B1 20B1 22B1 20B1 22B1

AA Partition, Frt Ht Exchanger

1

BB Gaskets, Heat Exchanger

CC Tubing, Silicone
DD Baffle, Nox

LL Sightglass

)( Part Not Illustrated
)( Fuse, 5 Amp

)( Harness, Wire

)( Manual, Installation & Tech
)( Manual, Users

Gas Conversion Kits
Natto LP NAHA001LP (1172958*)

LP to Nat NAHA001NG (1172960")
* Must be ordered from Service Parts

1013780
1013781
1013782

1013783
1013784
1013785

1013991
1013992

1013993
1013994

1172192
1014019
1172768

1083348
1172811

1172812
44101261302

44102201100

050B

12B1

1

2

1
2
1

1
1

1
1

1
3
1

1
1

1
1

1
3
1

1
1

1
1

1
4
1

1
1

1

1
4
1

1
1

1

2
1
5
1

1
1

1

2
1
5
1

1
1

1

441 01 2613 02 [_

Parts for *8MPN/L

18

BB

x

17

Z 16

U

11

\

15

AA

\ T

16

CC

1

G

F

E

25-25-09a

441 01 2613 02

I Replacement Parts - *8MPN (NaturalGas)

Models - *SMPNO50B12B1, *SMPNO75B12B1, *8MPNO75F16B1, *SMPN100F14B1, *SMPNIOOF2OB1, *8MPNIOOJ2OB1,
*SMPN125J20B1, *8MPN150J20B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Description
No, Functional

Heat Exchanger

2 Switch, Pressure
3 Wheel, Blower

4 Mount, Motor kit*

5 Motor, BIr 1/115 1/2 COW

1/115 1/2 COW
1/115 1/2 COW
1/115 3/4 COW

6 Capacitor 10 Mfd/370V

7.5 Mfd/370V
40 MFD/370V

7 Transformer

8 Control
9 Switch, Interlock

10 Burner Assembly

11 Flame Sensor

12 Ignitor
14 Orifice, Burner # 42

15 Valve, Gas
16 Switch, Limit (Rollout)
17 Switch, Limit (Main)

18 Blower, Combustion (Inducer)

Part

Number

1013551
1013519
1013550
1013552
1013553

1013554
1013555

1013529
1013011

1011420
1011433

1014824
1014823
1014822

1172490
1172487
1172488
1172489

1171729
1171728
1171982

1172810
1172550

1171981
1172884

1172965
1172966
1172967
1172968

1172827
1172533
1011351

1172821
1013102
1008417

1320362

34335000

1065294
1014433

050B
12B1

1

1
1

1

1

1

1
1

1
1

1
1
2

1
2
1

1

075B
12B1

1

1
1

1
1

1

1
1

3

1

2

075F

16B1

1

1

1
1

1
1

1

1
1
3

1
2
1

*8MPN

IOOF IOOF

14B1 20B1

1 1

1 1

1 1

1

1

1

1

1

1

1 1
1 1

1 1

1 1

1 1
1 1
4 4

1 1
2 2

1

1

1 1

100J

20B1

I

I

I

I

1
1

1

1
1
4

1
2

*See Table below for bellyband location on motor

Bellyband Location

on Motor

ModeI*8MPN A(in.)

050B12B1 1.38"
075B12B1 1.38"

075F16B1 1.38"

100F14B1 1.38"
100F20B1 1.81"

100J20B1 1.81"
125J20B1 1.81"
150J20B1 1.85"

125J

20B1

1

1

1

1

1

1
1

1

1
1

5

1

2

1
1

180J

20B1

1
1

1
1

1
1

1
1

1
8

1
2

1
1

I

441 01 2613 02

I Replacement Parts - *8MPN (NaturalGas)

Models - *8MPNO50B12B1, *8MPNO75B12B1, *8MPNO75F16B1, *8MPN100F14B1, *8MPNIOOF2OB1, *8MPNIOOJ2OB1,
*8MPN125J20B1, *8MPN150J2OB1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Description
No, Functional

Panel, Top

B Box, Junction
C Cover, Junction box

D Partition, Blower

E Housing, Blower

F Hanger, Blower

G Panel, Blower Cutoff

H

J

L

M

Clamp, Capacitor

Bracket, Control Mounting
Door, Blower (Heil/Arco)

(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)

(Tempstar Only)
(Tempstar Only)

(Tempstar Only)

Bracket, Door

N Door, Louver (Heil/Arco)

(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(Tempstar Only)
(Tempstar Only)
(Tempstar Only)

P Manifold, Gas

S Bracket, Manifold Support
T Top, Burner Box

U Bracket, Burner Box Sides
V Baffle, Burner Box

Part

Number

1013982
1013983
1013984

1172860
1012350
1014009

1014010
1014011
1014013

1172885
1172969
1172970

1012328

721020013
721020008
721020015

1170643
1014315

1172845

1173011

1173012
1173013

1173008
1173009
1173010
1173014
1173015
1173016

1172231
1172232
1172233
1172266

1173005
1173006
1173007
1173002
1173003

1173004
1013609
1013610
1013611

1013478
1013479
1013480

1013481
1013482

1012377
1013705

1013015
1013016

1013859
1012532
1012338

1012339
1012340
1013533

050B 075B
12B1 12B1

1 1

1 1
1 1
1 1

1 1

2 2
1 1

1 1

1 1
1 1

1 1

1 1

1 1

1 1

1 1

1 1

1

1

2 2
1 1

2 2
1 1

075F
16B1

1

1
1

1

1

2

1

1

1

1

1

1

1

1

1

1

2
1

2
1

*8MPN

IOOF I IOOF14B1 20B1

1 1

1 1
1 1

1 1

1 1

2 2

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1 1

2 2

1 1

2 2

1 1

I lOOJ I "125J20B1 20B1

1 1
1 1
1 1

1 1

1 1

2 2

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1

1

1

1

2

1

2

1

1

1

1

1

2

1

2

I

150J

20B1

1
1
1

1
2

1

1
1

1

1

1

1
2

1
2

441 01 2613 02

|

I Replacement Parts - *8MPN (NaturalGas)

Models - *SMPN050B12B1, *SMPN075B12B1, *8MPN075F16B1, *SMPN100F14B1, *SMPN100F20B1, *8MPN100J20B1,
*SMPN125J20B1, *8MPN150J20B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Description Part
No, Functional Number 075B 075F 100J "125J 150J

12B1 16B1 20B1 20B1 20B1

W Bottom, Burner Box

1 1

Collector Box

Z Gasket, Combustion Blower

AA Partition, Front Ht Exchanger

BB Gaskets, Heat Exchanger

CC Tubing, Silicone

LL Sightglass

)( PARTNOT ILLUSTRATED
)( Fuse, 5 Amp

)( Harness, Wire
)( Door Screw

)( Door Screw Grommet
)( Manual, Installation & Tech

)( Manual, Users

1172847
1172848
1172849

1172850
1172851

1014510
1014511

1014509
1014512
1013486

1013540
1013543

1013521
1013545
1013546
1013547
1013548
1013549

1013991
1013992

1013993
1013994
1012546

1172195
1172196

1172768

1083348
1172813

1014488
1171990

44101261302
44102201100

050B
12B1

1

1

1
1

2

1

1

1
1

4
4
1

1

1

1

1

1

1
1

4
4

1
1

1

1

1

1

1
1

4
4
1

1

*8MPN

100F 100F

14B1 20B1

1 1

1 1

1 1

1 1

2 2

1 1

1 1

1 1
1 1

4 4
4 4
1 1

1 1

1

1

1
1

1
1

4
4
1

1

1

1

1
1

1
1

4
4

1
1

1
1

2

1
1

1
1

4
4
1

1

I

441 01 2613 02 [_

I Replacement Parts - *8MPL (NaturalGas) I

Models - *8MPLO5OB12B1, *8MPLO75B12B1, *8MPLO75F16B1, *SMPLIOOF2OB1, *8MPLIOOJ 20B1, *8MPL125J20B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

*8MPL

Key Description Part

No. Functional Number 050B 075B 075F IOOF lOOJ 125J

12B1 12B1 16B1 20B1 20B1 20B1

1 Heat Exchanger 1

1

2 Switch, Pressure
3 Wheel, Blower

4 Mount, Motor kit*

Motor, Blower

6 Capacitor

7 Transformer
8 Control

9 Switch, Interlock

10 Burner Assembly

11 Flame Sensor
12 Ignitor

14 Orifice, Burner # 42
15 Valve, Gas

16 Switch, Limit (Rollout)
17 Switch, Limit (Main)

1/115 1/2 CCW
1/115 1/2 CCW
1/115 1/2 COW

18 Blower, Combustion (Inducer)

*See Table below for bellyband location on motor

Bellyband Location

on Motor

1014316
1014317
1014318
1014319

1014320
1014321

1013529

1013011
1011420

1014824
1014823
1014822

1172490
1172487
1172488

1171729
1171728

1172810
1172550

1171981
1172884

1172965
1172966
1172967

1172827
1172533

1011351
1172821

1013102
1008417

1320362
1065294

1014433

1
1

1
1

1
1

1
1

2
1

2
1

1
1

1
1
1

1

1
1

3
1

2

1

1

1
1

1
1

1

1
1

3
1

2
1

1

1

1

1
1

1
1

1

1
1

4

1
2

ModeI*8MPL "A"(in.)

050B12B1 1.38"
075B12B1 1.38"
075F16B1 1.38"

100F20B1 1.81"
100J20B1 1.81"

1

1

1

1

1
1

1
1

1

1
1

4

1
2

125J20B1 1.81"

1
1

1

1

1
1

1
1

1

1
1

1
5

1
2

1
1

_] 441 01 2613 02

I Replacement Parts - *8MPL (NaturalGas) I

Models - *8MPL050B12B1, *8MPL075B12B1, *8MPL075F16B1, *SMPL100F20B1, *8MPL100J 20B1, *8MPL125J20B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

Key Description Part

No, Functional Number 050B *075B

12B1 12B1

A Panel, Top 1 1

B Box, Junction
C Cover, Junction box
D Partition, Blower

E Housing, Blower

F Hanger, Blower
G Panel, Blower Cutoff

H

J

L

M

Clamp, Capacitor
Bracket, Control Mounting
Door, Blower (Heil/Arco)

(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(Tempstar Only)
(Tempstar Only)

(Tempstar Only)

Bracket, Door

Door, Louver

Manifold, Gas

(Heil/Arco)
(Heil/Arco)

(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(TempstarOnly)
(TempstarOnly)
(TempstarOnly)

S Bracket, Manifold Support

T Top, Burner Box

U Bracket, Burner Box Sides
V Baffle, Burner Box

W Bottom, Burner Box

1013982
1013983
1013984

1172860
1012350

1014009
1014010

1014011
1172885

1172969
1012328

721020013
721020008

1170643
1172845

1173011
1173012
1173013
1173008
1173009
1173010

1173014
1173015
1173016

1172231
1172232
1172233

1173005
1173006

1173007
1173002
1173003
1173004
1013609

1013610
1013611

1013478
1013479
1013480
1013481

1012377
1013705

1013015
1013016

1012532
1012338

1012339
1012340

1172847
1172848

1172849
1172850

1
1

1

2
1

1
1

1

1

1

1

1

2
1

2
1

1
1

1

2
1

1
1

1

1

1

1

1

2
1

2
1

075F
16B1

1

1
1

1

1
2

1
1

1

1

1

1

1

1

1

1

1

2
1

2
1

*8MPL

IOOF
20B1

1

1
1

1

1

2

1
1

1

1

1

1

1

1

1

1

1

2

1

2

1

100J

20B1

1
1

1

1

1

2

1
1

1

1

1

1

1

1

1

1

1

2

1

2

1

125J

20B1

1
1

1

1

1
2

1
1

1

1

1

1

1

1

1

1

1
2

1
2

441 01 2613 02 [_

|

I Replacement Parts - 8MPL (NaturalGas) I

Models - '8MPLO5OB12B1, '8MPLO75B12B1, "8MPLO75F16B1, "SMPLIOOF2OB1, '8MPLIOOJ 20B1, "8MPL125J20B1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.

*8MPL

Key Description Part

No. Functional Number 050B _075B 100F lOOJ 125J

12B1 12B1 20B1 20B1 20B1

X Collector Box 1

1

Z Gasket, Combustion Blower

AA Partition, Front Ht Exchanger

BB Gaskets, Heat Exchanger

CC Tubing, Silicone

DD Baffle, Nox

LL Sughtglass

)( PARTNOT ILLUSTRATED
)( Fuse, 5 Amp

)( Harness, Wire
)( Door Screw

)( Door Screw Grommet
)( Manual, Installation & Tech

)( Manual, Users

GasConversion Kits
Natto LP NAHA001LP(1172958_)

LPto Nat NAHA001NG(1172960_)

* MustbeorderedfromServiceParts

1014510
1014511
1014509
1014512

1013540
1013543

1013521
1013545
1013546

1013547
1013548

1013991
1013992

1013993
1013994

1172195
1172196

1014019
1172768

1083348
1172813
1014488

1171990

44101261302

44102201100

1
1

1

2
1

1
1
4

4
1

1

1

1

1

3
1

1
1
4

4
1

1

075F
16B1

1

1

1

1

3
1

1
1
4

4
1

1

1

1

1

4

1

1
1

4
4

1
1

1

1

1

4

1

1
1

4
4

1
1

1
1

1
5
1

1
1

4
4

1
1

441 01 2613 02