N8MPN050B12B1 44101261106

User Manual: N8MPN050B12B1

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N8MPN & N8MPL
*8MPN & *8MPL
* Denotes Brands (C, H, T)
See section 5 for Category I definition.

SAFETY REQUIREMENTS
Recognize safety information. This is the safety--alert symbol
to the potential for personal injury.

! . When you see this symbol on the furnace and in instruction manuals be alert

Understand the signal words DANGER, WARNING, or CAUTION. 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. WARNING signifies a hazard that could result in personal injury or
death. CAUTION is 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 attached 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--00. 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 practices. We require these instructions as a minimum for a safe installation.

International Comfort Products, LLC
Lewisburg, TN 37091

INSTALLER: Affix these instructions
on or adjacent to the furnace.
CONSUMER: Retain these
instructions for future reference.

Table of Contents

1.
2.
3.
4.
5.
6.
7.
8.

Safe Installation Requirements . . . . . . . . . . . . . . .
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion & Ventilation Air . . . . . . . . . . . . . . . .
Gas Vent Installation . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Venting . . . . . . . . . . . . . . . . . . . . . . . . .
Masonry Chimney Venting . . . . . . . . . . . . . . . . . . .
Gas Supply and Piping . . . . . . . . . . . . . . . . . . . . .

3
4
8
9
12
14
16
19

WARNING

ELECTRIC SHOCK HAZARD
Failure to follow safety warnings
exactly could result in serious
injury, death, and/or property
damage.
Turn Off All Power Before
Servicing.

9. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . .
10.Ductwork and Filter (Upflow/Horizontal) . . . . . . .
11.Ductwork and Filter (Downflow) . . . . . . . . . . . . .
12. Checks and Adjustments . . . . . . . . . . . . . . . . . . .
13. Furnace Maintenance . . . . . . . . . . . . . . . . . . . . .
14. Sequence of Operation & Diagnostics . . . . . . . . .
Tech Support and Parts . . . . . . . . . . . . . . . . . . . . . . .

WARNING

22
23
25
29
33
34
37

WARNING

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--2002ã, 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.

Printed in U.S.A.

10/19/2004

441 01 2611 (06)

START--UP CHECK SHEET
(Keep this page for future reference)
Recommended, but not required. Checklist DOES NOT apply in Canada
Dealer Name:
Business Card Here

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

Phone:
Owner Name:

Manual Gas Shut--Off Upstream

Address:

of Furnace/Drip--Leg?

YES

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

Drip--Leg Upstream of Gas Valve?

YES

Blower Speed Checked?

YES

Model Number:
All Electrical Connections Tight?

Serial Number:
Type of Gas:

Natural:

Gas Valve OK?

LP:

YES

Blower Motor H.P.:

Measured Line Pressure When Firing Unit:

Supply Voltage:

Calculated Firing Rate:(See Checks and Adjustments

Limit Opens at...(°F)

or(°C)

Limit Closes at...(°F)

or(°C)

Section).
Measured Manifold Pressure:

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)
Filter Type and Size:

Thermostat OK?

YES

Subbase Level?

YES

Anticipator Set?

YES

Set At?:

or(°C)
Breaker On?

YES

Fan “Time ON” Setting:

Date of Installation:

Fan “Time OFF” Setting:

Date of Start--Up:

Dealer Comments:

441 01 2611 06

1. Safe Installation Requirements

WARNING

FIRE, EXPLOSION, AND ASPHIXIATION HAZARD
Improper adjustment, alteration, service,
maintance or installation could cause serious
injury, death 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.
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 specified in “2. Installation” of these instructions.

Provide adequate combustion and ventilation air to the furnace as specified in “4. Combustion and Ventilation Air” of
these instructions.

Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in “5. Gas Vent Installation, 6. Horizontal Venting and
7. Masonry Chimney Venting” of these instructions.

Never test for gas leaks with an open flame. Use a commercially 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 instructions.

Always install furnace to operate within the furnace’s intended 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 instructions.

When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a
duct(s) sealed to the furnace casing and terminating outside 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.

441 01 2611 06

·
·
·
·
·

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 mobile 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 protected 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, and several other items.
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 carbon
monoxide levels, you should have a commercially available
carbon monoxide alarm that is listed by a nationally recognized testing agency in accordance with Underwriters Laboratories Inc. Standard for Single and Multiple Station Carbon
Monoxide Alarms, ANSI/UL 2034 or the CSA 6.19--01 Residential 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 instructions.
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 dangerous fire or smoke, you should have
fire extinguisher and smoke alarms listed by Underwriters Laboratories 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.
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 hazards involved with gas and electricity.
2. Do not use this unit if any part has been under water. Immediately 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.

Frozen Water Pipe Hazard
!

WARNING

FROZEN AND BURST WATER PIPE HAZARD
FaiIure to protect against the risk of freezing could
result in property damage and/or personal injury.
Do not leave your home unattended for long periods
during freezing weather without turning off water
supply and draining water pipes or otherwise
protecting 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 devices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.

If your furnace remains off for an extended time, the pipes in your
home could freeze and burst, resulting in serious water damage.
If the structure will be unattended during cold weather you should
take these precautions.
1.

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--

Install a reliable remote sensing device that will notify somebody of freezing conditions within the home.

2. Installation

WARNING

!
CARBON MONOXIDE POISONING HAZARD.
Failure to properly vent this furnace or other
appliances could result in death, personal injury
and/or property damage.
If this furnace is replacing a previously commonvented 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 existing location based upon the minimum clearance and furnace dimensions (Figure 1 or Figure 2).

WARNING

CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warnings could result in
serious injury, death, or property damage.
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.

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 combustible material other than wood flooring.
6. Maintain clearance for fire safety and servicing. A front clearance of 30² 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 18² (457
mm) above the floor.

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

9. If the furnace is to be suspended from the floor joists in a basement 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 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.
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 provided, sealed to the furnace casing, and terminated outside 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 combustion 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 entrainment of drywall dust into combustion air, which can cause
fouling and plugging of furnace components.

The temperature of the return air to the furnace is maintained 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.

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.

441 01 2611 06

The air temperature rise is within the rated rise range on
the furnace rating plate, and the firing rate has been set to
the rating plate value.

The furnace, ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from
all HVAC system components after construction is completed.

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

Verify proper furnace operating conditions including ignition, gas input rate, air temperature rise, and venting according to these installation instructions.

Dimensions and Clearances (N8MPN/L)

Figure 1

MINIMUM CLEARANCES TO COMBUSTIBLE
MATERIALS FOR ALL FURNACES
REAR
FRONT (combustion air openings
in furnace and structure)

TOP

51/3

ALL SIDES Of SUPPLY PLENUM
SIDES
VENT
Single--Wall Vent
Type B--1 Double--Wall Vent
TOP OF FURNACE

30² Min.

61/2
5

LEFT SIDE
A
33
7

131/4

271/2
241/2

FRONT
281/2
33/4

171/3

181/2

3/
4

RIGHT SIDE

11/2

47/8

213/4

17/8

6²
1²
1²

Horizontal position: Line contact is permissible only between lines
formed by intersections of top and two sides of furnace jacket, and
building joists, studs or framing.

131/4

1²
0

*30² clearance recommended for casing removal.

33/4

Plugged starting
hole to cut side
duct opening

*24²

Required For Service

31/4

21/4

0
3²

265/8
281/2
BOTTOM

Drawing is representative, but some models may vary

J
H

131/4
171/3

131/4

DIMENSIONS IN INCHES

DIMENSIONAL INFORMATION
Cabinet

Bottom

Furnace
Model

Return Air
Opening

N8MPN/L050B12
N8MPN/L075B12

151/2

13/8

125/8

N8MPN/L075F16
N8MPN100F14
N8MPN/L100F20

191/8

175/8

21/8

143/4

N8MPN/L100J22
N8MPN/L125J20
N8MPN/L125J22

223/4

211/4

21/4

41/16

231/8

253/4

115/16

183/4

11/2

47/8

213/4
265/8

17/8

Plugged starting hole to cut
side duct opening

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

25--23--44a1

Furnace is designed for bottom return or side return.
Return air through back of furnace is NOT allowed.

441 01 2611 06

Dimensions and Clearances (*8MPN/L Models)

Figure 2

MINIMUM CLEARANCES TO COMBUSTIBLE
MATERIALS FOR ALL UNITS
REAR
FRONT (combustion air openings
in furnace and structure)

TOP
F

ALL SIDES Of SUPPLY PLENUM
SIDES
VENT
Single--Wall Vent
Type B--1 Double Wall Vent
TOP OF FURNACE

30² Min.

5
1

LEFT SIDE

33/4

A
7

131/4

277/8

6²
1²
1²

Horizontal position: Line contact is permissible only between lines
formed by intersections of top and two sides of furnace jacket, and
building joists, studs or framing.

FRONT

1²
0

*30² clearance recommended for casing removal.

321/2
175/16

Plugged starting
hole to cut side
duct opening

*24²

Required For Service

51/3

21/4

0
3²

281/2

271/2

181/2

33/4

3/
4

2
213/4

17/8

265/8

11/2

47/8

RIGHT SIDE
1

BOTTOM

Drawing is representative some models may vary
DIMENSIONS IN INCHES

DIMENSIONAL INFORMATION
Cabinet

Furnace
Model

*8MPN/L050B12
*8MPN/L075B12

151/2

*8MPN/L075F16
*8MPN100F14
*8MPN/L100F20

191/8 175/8

*8MPN/L100J20
*8MPN/L125J20
*8MPN150J20

223/4

B
14

211/4

Top

Bottom

Return Air
Opening

13/8

125/8

73/4

21/8

143/4

91/2

115/16

303/4

291/2

41/16

231/8

183/4

33 1/2

11/2

40
21/4
131/4

175/16

213/4

47/8

265/8

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.

17/8

Plugged starting hole to
cut side duct opening

Return air through back of furnace is NOT allowed.

* Denotes Brand

Furnace Installation

Upflow

Inspect the rating plate to be certain the model number begins with
“N8MP” or “*8MP”. This identifies the unit as a multi--position furnace and can be Installed in a Upflow, Horizontal Right, Horizontal
Left or Downflow position.

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

441 01 2611 06

Figure 3

Typical Upflow Installation
SUPPLY
AIR

This furnace MUST NOT be installed directly on carpeting, tile or
other combustible material other than wood flooring or supports.

VENT

RETURN
AIR

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 12² beyond
the front of the furnace louver door. (This is a recommendation
only, not a requirement).

Downflow
!
FIRE HAZARD.
GAS SUPPLY

25--23--17

Horizontal
If you purchased a multi--position furnace, it can be installed horizontally 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.

Figure 4

Typical Horizontal Installation

WARNING

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 (*8MP) it may be
installed in a downflow configuration, (see Figure 5). The minimum 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. “Ductwork 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.

VENT

RETURN
AIR

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

SUPPLY
AIR

GAS SUPPLY

OPTIONAL
VENT LOCATION

25- 23- 18a

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, consult local codes. A concrete pad 1² to 2² thick is recommended.
Thirty inches (30²) is required between the front of the furnace and
adjacent construction or other appliances. This should be maintained for service clearance.
Keep all insulating materials clear from louvered door. Insulating
materials may be combustible.
441 01 2611 06

4. Remove two thumbscrews from blower compartment door by
cutting apart metal retainer washers on inside of door with
small diagonal cutting pliers. The retainer washers will not unscrew from the thumbscrews. Save the two thumbscrews and
two plastic washers.
5. Install two thumbscrews in holes at other end of blower
compartment door from where thumbscrews were removed.
a.

A plastic washer should be on each of the two thumbscrews before inserting the thumbscrews into the blower
compartment door holes.
b. After inserting each thumbscrew into the proper hole in
the blower door, push a new metal retainer washer onto
each thumbscrew as far as it will go.
6. Install new strip of rubber gasket on inside of blower compartment 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.

1. Carefully remove logo from burner compartment door and
save it.
2. Turn the logo rightside--up, and install the logo retainer pins
into holes in burner compartment door.
3. New labels for rightside--up application on outside of blower
compartment door may be purchased in a kit from your distributor to cover upside--down labels.

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.

Figure 5

Downflow Venting: The combustion venter MUST be rotated to
vent out the side for all downflow installations, (see Figure 5). Bottom venting is not permitted. See “Side venting” for instructions to
rotate the vent to the side. In addition to rotating the vent to the side
a Vent Pipe Shield (NAHA002VC) is required to shield the hot
vent pipe.

WARNING

RETURN
AIR

See side venting
for venter rotation

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.

Typical Downflow Installation

VENT

N8MPN/L, C8MPN/L, H8MPN/L

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 surfaces as to not melt the hose, switch, or wires. To prevent possible
kinking of the pressure switch hose, trim the hose to remove excess length.

Combustible floor
base outlet flange
adapter

OPTIONAL VENT

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

Install vent pipe shield NAHA002VC.

Pressure Switch Relocation

Vent Shield
Kit

If the furnace is installed in the upflow 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 inducer housing, then the switch MUST be relocated. In order to re-

GAS SUPPLY
MUST BE OPPOSITE
VENT DISCHARGE
SIDE
SUPPLY
AIR

25--23--19

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.

Figure 6

Furnace with Screws

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. 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.
2. Disconnect power leads to the venter motor and hose to pressure switch. Remove three (3) or four (4) screws which secure
the venter to the collector box, (see Figure 7).

Vent Plate

Screws (2)
25--23--45

3. 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).

441 01 2611 06

Figure 7

Venter Gasket

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

Entry

5. Rotate venter assembly 90° right or left from original location
depending on venting configurations.
6. 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.

Main Line

7. 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 NAHA002VC. A 55/16² diameter
Vent Cover is available separately from your distributor, or one can
be fabricated with sheet metal for all side vent installations.
25--23--52b

25--23--52c

4. Combustion & Ventilation Air
!

WARNING

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

CARBON MONOXIDE POISONING HAZARD.
Failure to provide adequate combustion and
ventilation air could result in death and/or personal
injury.
Use methods described here
combustion and ventilation air.

provide

Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or openings for supplying combustion and ventilation air must comply with
the gas codes, or in the absence of local codes, the applicable national 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--00 in Canada,
3. Applicable provisions of the local building code.

·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·

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.
Halogen type refrigerants.
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
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.

When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting
And Combustion Air Check in “5. Gas Vent Installation” Section in
this manual.

Air Openings and Connecting Ducts

Contaminated Combustion Air

2. Connect ducts or openings directly to the outdoors.

Installations in certain areas or types of structures could cause excessive exposure to contaminated air having chemicals or halogens that will result in safety and performance related problems
and may harm the furnace. These instances must use only outdoor air for combustion.
The following areas or types of structures may contain or have exposure to the substances listed below. The installation must be
441 01 2611 06

1. Total input rating for all gas appliances in the space MUST be
considered when determining free area of openings.
3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4² mesh.
4. The minimum dimension of air ducts MUST NOT be less than
3² .
5. When sizing a grille, louver or screen use the free area of opening. 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 1/4².

Requirements

air when two permanent openings, one inlet and one outlet, are
used.

1. Provide the space with sufficient air for proper combustion and
ventilation of flue gases using horizontal or vertical ducts or
openings.
2. Figure 8 illustrates how to provide combustion and ventilation

Figure 8

One opening MUST commence within 12² of the floor
and the second opening MUST commence within 12² of
the ceiling.

Size openings and ducts per Table 1.

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

This installation NOT approved in Canada
Gable Vent

Gas Vent

Gable Vent

Gas Vent

Ventilated Attic
Top Above Insulation
Optional Inlet Air (1)

Ventilated Attic

Gas Vent

Top Above Insulation

Outlet Air (1)

Inlet
Air (1)

Furnace

Soffit Vent

Outlet Air (1)

Soffit Vent

Outlet
Air (1)

Furnace

Inlet
Air (2)

Ventilated Crawl Space

Outlet
Air (2)

Inlet
Air (1)

Furnace

Inlet
Air (2)

Minimum One Inlet and One Outlet Air Supply is Required
May be in and Combination Shown
Inlet Air Opening Must be Within12²(300mm) of floor
Outlet Air Opening Must be Within12²(300mm) of ceiling
(1) 1 Square Inch (6cm2) per 4000 BTUH
(2) 1 Square Inch (6cm2) per 2000 BTUH

Horizontal duct openings require 1 square inch of free
area per 2,000 BTUH (1,100 mm2/kW) of combined input
for all gas appliances in the space (see Table 1).

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.

Vertical duct openings or openings directly communicating with the outdoors require 1 square inch of free area
per 4,000 BTUH (550 mm2/kW) for combined input of all
gas appliances in the space (see Table 1).

4. Combination of Indoor and Outdoor Air shall have:

3. 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

Indoor openings that comply with the Indoor Combustion 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 divided by required volume for Indoor Combustion Air Method. Outdoor openings sized as follows.

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

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

the space.

The opening shall commence within 12² of the top of the enclosure. Appliances shall have clearances of at least 1² from the sides
and back and 6² from the front. The opening shall directly commu-

Table 1

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

Free Area
Minimum Free Area Required for Each Opening or Duct to Outdoors

BTUH
Input
Rating

Two Horizontal Ducts
(sq. in./2,000 BTUH)

Single Opening
(sq. in./3,000 BTUH)

Two Vertical Ducts or Openings
(sq. in./4,000 BTUH)

Round Duct
(sq. in. /4,000
BTUH)

50,000

25 sq. in.

16.7 sq. in.

12.5 sq. in.

4²

75,000

37.5 sq. in.

25 sq. in.

18.75 sq. in.

5²

100,000

50 sq. in.

33.3 sq. in.

25 sq. in.

6²

125,000

62.50 sq. in.

41.7 sq. in.

31.25 sq. in.

7²

150,000

75 sq. in.

50 sq. in.

37.5 sq. in.

7²

EXAMPLE: Determining Free Area
Furnace
100,000
Furnace
100,000

+
+

Water Heater
30,000
Water Heater
30,000

=
=

Total Input
(130,000 ¸ 4,000)
Total Input
(130,000 ¸ 2,000)

32.5 Sq. In. Vertical

65 Sq. In. Horizontal
441 01 2611 06

Indoor Combustion Air

The Standard Method may be used, if the space has no less volume than 50 cubic feet per 1,000 BTUH of the maximum input ratings for all gas appliances installed in the space. The standard
method permits indoor air to be used for combustion and ventilation air.

Standard and Known-- Air-- Infiltration Rate Methods
ã NFPA & AGA

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

The Known Air Infiltration Rate Method shall be used if the infiltration rate is known to be less than 0.40 air changes per hour
(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 volume for the space.

WARNING

CARBON MONOXIDE POISONING HAZARD.
Failure to supply adequate combustion air could
result in death and/or personal injury.
Most homes will require additional air from outdoors
for combustion and ventilation. A space with at least
50 cubic feet per 1,000 BTUH input rating or homes
with tight construction may need outdoor air to
supplement air infiltration for proper combustion
and ventilation of flue gases.
T bl 2
Table

MINIMUM SPACE VOLUME FOR 100% COMBUSTION AND VENTILATION AIR FROM INDOORS (ft3)
Other Than Fan- Assisted Total
(1,000’s Btuh)

Fan- assisted Total
(1,000’s Btuh)

ACH

0.60

1,050

1,400

1,750

1,250

1,875

2,500

3,125

3,750

0.50

1,260

1,680

2,100

1,500

2,250

3,000

3,750

4,500

0.40

1,575

2,100

2,625

1,875

2,813

3,750

4,688

5,625

0.30

2,100

2,800

3,500

2,500

3,750

5,000

6,250

7,500

0.20

3,150

4,200

5,250

3,750

5,625

7,500

9,375

11,250

0.10

6,300

8,400

10,500

7,500

11,250

15,000

18,750

22,500

0.00

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,
Volume

21 ft3
ACH

(

I other
1000 Btu / hr

fan =

15 ft3
ACH

(

I fan
1000 Btu / hr

)

I other = combined input of all other than fan--assisted
appliances in Btu/hr
I 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 remain open and NOT have any means of being closed off. Ven-

441 01 2611 06

125

150

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 appliances in the space.

In spaces that use the Indoor Combustion Air Method, infiltration 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 provided using the methods described in section titled Outdoor
Combustion Air Method:

Unusually tight construction is defined as Construction with:

)

For fan--assisted appliances such as this furnace,

Volume

If:

other =

100

Walls and ceilings exposed to the outdoors have a continuous, sealed vapor barrier. Openings are gasketed or
sealed and

Doors and openable windows are weather stripped and

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 replacement air. Whichever method is used, the mixed return air temperature 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 condensation will shorten the life of the heat exchanger and possibly
void your warranty.

5. Gas Vent Installation

WARNING
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 jurisdiction, local codes or ordinances and these instructions.
This Category I furnace is fan--assisted. A fan assisted appliance
is an appliance equipped with an integral mechanical means to either draw or force products of combustion through the heat exchanger.
Category I 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 I furnace vent installations shall be in accordance with
Parts 10 and 13 of the National Fuel Gas Code (NFGC), ANSI
Z223.1--2002/NFPA 54--2002; and/or Section 7 and Appendix C of
the CSA B149.1--00, National Standard of Canada, Natural Gas
and Propane Installation Code; the local building codes; furnace
and vent manufacturer’s instructions.
NOTE: The following instructions comply with the ANSI
Z223.1/NFPA 54 National Fuel Gas Code and CSA B149.1 Natural Gas and Propane Installation code, based on the input rate on
the furnace rating plate.
1. If a Category I 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 fireplace or solid fuel burning appliance.
3. Use the same diameter Category I connector or pipe as permitted by:
· the National Fuel Gas Code Code (NFGC) ANSI
Z223.1--2002 / NFPA 54--2002 sections 10 and 13 venting requirements in the United States
or
· the National Standard of Canada Natural Gas and Propane Installation Code (NSCNGPIC) CSA B149.1--00
section 7 and appendix C venting requirements in Canada.
4. Push the vent connector onto the furnace flue collar of the
venter assembly until it touches the bead (at least 5/8² overlap)
and fasten with at least two field--supplied, corrosion--resistant, sheet metal screws located at least 140° apart.
5. Keep vertical Category I 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. Slope all horizontal runs up from furnace to the vent terminal a
minimum of 1/4² per foot (21 mm/m).

8. Rigidly support all horizontal portions of the venting system every 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 clearances 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 masonry chimney or concrete chimney is prohibited. See the
6. Masonry Chimney Venting section in these instructions.
11. Fan--assisted combustion system Category I furnaces shall
not be vented into single--wall metal vents.
12. Category I furnaces must be vented vertically or nearly vertically, unless equipped with a listed mechanical venter.
13. Vent connectors serving Category I furnaces shall not be connected into any portion of mechanical draft systems operating
under positive pressure.
A 4--to--3 inch reducer is permitted at the flue collar when installing
a 50,000 Btuh gas input furnace, if the installation meets all the following requirements for sizing the vent connectors and vents:
1.

The
National
Fuel
Gas
Code,
ANSI
Z223.1/NFPA--54--2002,
sections
10.5.3.1(1),
10.6.3.1(2), 10.10.3.1, 13.1.2, 13.1.10, and 13.2.21(1)
through (3) in the U.S. or

The Natural Gas and Propane Installation Code CSA
B149.1--00, sections 7.13.1(b), 7.13.2(b), 7.18.5(b),
and Appendix C--GVR no. 2. in Canada.

441 01 2611 06

Venting and Combustion Air Check
NOTE: When an existing Category I furnace is removed or replaced, the original venting system may no longer be sized to properly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOLLOWING CHECK.

WARNING

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. Determine that there is no blockage or restriction, leakage, corrosion 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.

Figure 9

Vent Check

Vent Pipe
Typical Gas
Water Heater

Draft Hood
Match

NOTE: If flame pulls towards draft hood, this indicates
sufficient infiltration air.

Venting to Existing Masonry Chimney
Dedicated venting of one fan assisted furnace into any masonry chimney is restricted. A chimney must first be lined with
either Type B vent sized in accordance with NFGC tables 13.1 or
13.2 or a listed, metal lining system, or venting into a masonry
chimney is permitted as outlined with use of an optional listed masonry chimney kit. (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 dedicated venting and per 13.2.19 for common venting with the maximum 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 reduction 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.

4.Close fireplace dampers.

Combined Venting into a Masonry Chimney

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.

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.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 connected 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.

441 01 2611 06

6. Horizontal Venting
Category I Furnaces With External Power
Venters
In order to maintain a Category I classification of fan--assisted furnaces when vented horizontally with sidewall termination, a power
venter is REQUIRED to maintain a negative pressure in the venting system.
In the U.S.: Per the NFGC, a listed power venter may be used,
when approved by the authority having jurisdiction.
In Canada: Only power venters approved by the appliance
manufacturer and where allowed by the authority having jurisdiction may be used
Please consult the Fields Controls Co. or Tjernlund Products, Inc.
for power venters certified for use with our furnaces.

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 being vented. Follow all of the Power Venter manufacturer’s installation requirements included with the power venter for:

venting installation,

vent terminal location,

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 2611 06

Figure 10

Other than Direct Vent Termination Clearance

G
X

B
B

J
A
25--24--65--2

X AIR SUPPLY INLET

V VENT TERMINAL
Item

Clearance Descriptions

AREA WHERE TERMINAL IS NOT PERMITED
Canadian Installation (1)

U.S. Installation (2)

Clearance above grade, veranda, porch, deck, balcony, or
anticipated snow level

12² (30cm) #

12² (30 cm)

Clearance to a window or door that may be opened

6² (15 cm) for appliances £ 10,000 BTUH (3kW), 12² (30
cm) for appliances > 10,000 Btuh (3 kW) and £ 100,000 Btuh
(30 kW), 36² (91 cm) for appliances > 100,000 Btuh (30 kW)

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

Clearance to a permanently closed window

Vertical clearance to a ventilated soffit located above the terminal within a horizontal distance of 2¢ (61cm) from the centerline of the terminal

Clearance to an unventilated soffit

Clearance to an outside corner

Clearance to an inside corner

Clearance to each side of the centerline extended above electrical meter or gas service regulator assembly

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

Clearance to service regulator vent outlet

3¢ (91 cm)

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

6² (15 cm) for appliances £ 10,000 BTUH (3kW), 12² (30
cm) for appliances > 10,000 Btuh (3 kW) and £ 100,000 Btuh
(30 kW), 36² (91 cm) for appliances > 100,000 Btuh (30 kW)

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

Clearance to a mechanical air supply inlet

6¢ (1.83 m)

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

Clearance under a veranda, porch, deck, or balcony

12² (30 cm) +

Clearance to each side of the centerline 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)

(1.) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
(2.) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
#

18² (46 cm) above roof surface

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.
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 operation 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 combustiob products of adjacent vents.
Recirculation can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.

441 01 2611 06

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 inspection reveals damage or abnormal conditions, make necessary 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 appliance flue collar or drafthood outlet.

Connector Type
To reduce flue gas heat loss and the chance of condensate problems, 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 I appliance.
Exterior Chimney -- has one or more sides exposed to the outdoors below the roof line. All installations with a 99% Winter Design 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 (Canada), 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).

U.S.A.--Refer to Sections 13.1.9 or 13.2.20 of the NFGC or the authority having jurisdiction to determine whether relining is required.
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 NAHA001DH and NAHA002DH.
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

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

The combined appliance input rating is less than the maximum capacity given in Table A, and

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

The authority having jurisdiction approves.

WARNING

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.

If a clay tile--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, Fireplaces, 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.

If all of these conditions cannot be met, an alternative venting design 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 2611 06

Figure 11

CHIMNEY INSPECTION CHART

Foradditional requirementsreferto the National Fuel GasCode NFPA 54/ANSI Z223.1--2002 and ANSI/NFPA 211--2003 Chimneys, Fireplaces, Vents, and Solid Fuel
Burning Appliances in the U.S.A. or to the Canadian Installation Code CSA B149.1--00 in Canada.
Crown
condition:
Missing mortar
or brick?

Yes

Rebuild
crown

Is
Chimney properly lined
with clay tile
liner?

Yes
Is
liner and top
seal in good
condition

Repair
liner or top seal
or reline chimney as
necessary.

Yes

Reline

Repair

Debris in
cleanout? Mortar, tile,
metal vent, fuel oil
residue?

No
Clay
tile misalignment,
missing sections,
gaps?

Remove metal vent or liner.

Remove mortar
and tile debris?

Yes

Chimney
exposed to outdoors
below roof line?

Yes

Condensate
drainage at bottom
of chimney?

Mortar or
tile debris?

Yes

Is Chimney
lined with properly
sized, listed liner or
Type--B vent?

Consult
Part B of chimney
adapter venting
instructions for
application
suitability.

Suitable
Yes

Yes

Is Chimney to
be dedicated to a
single furnace?

Not Suitable

Install chimney
adapter per
instructions.

Not Suitable

Consult
Part C of chimney
adapter venting
instructions for
application
suitability.

Line chimney with properly
sized, listed flexible metal
liner or Type--B vent per NFGC or
NSCNGPIC Vent Sizing Tables
and liner or vent manufacturer’s
installation instructions.

Suitable
Install chimney
adapter per
instructions.

Chimney is
acceptable for use

441 01 2611 06

Exterior Masonry Chimney,
FAN+NAT Installations with
Type--B Double--Wall Vent Connectors
ã NFPA & AGA
Table A-Combined Appliance
Maximum Input Rating in
Thousands of Btu per Hr

119

178

257

INTERNAL AREA OF CHIMNEY
(SQ IN.)

130

193

279

138

207

299

152

233

334

250

368

404

Table B-Minimum Allowable Input Rating of
Space--Heating Appliance in
Thousands of Btu per Hr

INTERNAL AREA OF CHIMNEY
(SQ IN.)
19
28

17 t o 26°
26°F

141

111

154

125

169

167

212

258

362

Local 99% Winter Design Temperature: 5 to 16°° F*
5 t o 16°
6°°F

121

166

135

182

111

149

198

193

247

293

377

A chimney without a clay tile liner, which is otherwise in good condition, shall be rebuilt to conform to ANSI/NFPA 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 considered 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 operation has a significant impact on the performance
of the venting system. If the appliances are sized, installed, adjusted, and operated properly, the venting system and/or the appliances 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 Conditioning Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air--Conditioning Engineers; or other
approved engineering methods. Excessive oversizing of the furnace 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 following precautions must be observed:
1.

--10
-1 t o 4
4°°F

Local 99% Winter Design Temperature: --10 to 4°° F*
6

145

196

159

213

175

231

283

333

--11°° F
or
lower

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 1
(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 determine the acceptability of the chimney or the need for repair and/or
(re)lining. Refer to the Chimney Inspection Chart to perform a
chimney inspection.

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.
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.

APPLIANCE APPLICATION REQUIREMENTS

Local 99% Winter Design Temperature: 17 to 26°° F*
6

VENT
HEIGHT
(FT)

VENT
G
HEIGHT
(FT)

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

The return--air temperature must be at least 60°F db except
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.
Adjust the gas input rate per the installation instructions.
Low gas input rate causes low vent gas temperatures, causing condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above
2000¢.
Adjust the air temperature rise to the midpoint of the rise
range or slightly above. Low air temperature rise can cause
low vent gas temperature and potential for condensation
problems.
Set the thermostat heat anticipator or cycle rate to reduce
short cycling.

Air for combustion must not be contaminated by halogen compounds 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 solvent, salt, and air freshener, and can cause corrosion of furnaces
and vents. Avoid using such products in the combustion--air supply. Furnace use during construction of the building could cause
the furnace to be exposed to halogen compounds, causing premature failure of the furnace or venting system due to corrosion.
441 01 2611 06

Vent dampers on any appliance connected to the common vent
can cause condensation and corrosion in the venting system. Do
not use vent dampers on appliances common vented with this furnace.

8. Gas Supply and Piping

WARNING

CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.
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.

FIRE HAZARD

WARNING

Failure to follow safety warnings exactly could
result in serious injury, death, 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.
Figure 12

Gas Supply Requirements

Typical Gas Piping (N8MP)
Manual Equipment Shutoff Valve

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

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. Doing so will decrease input to furnace. Refer to Table 3 for gas
supply. Refer to Table 7 and Table 8 for manifold pressures.

Left entry

Union

Table 3
Gas Type

Gas Pressures
Supply Pressure
Recommended

Max.

Min.

Natural

7²

14²

4.5²

Propane

11²

14²

11²

Right entry
Dip leg & pipe cap
Left side entry

25--24--36

Gas Piping Requirements

Use black iron or steel pipe and fittings or other pipe approved
by local code.

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

Use pipe thread compound which is resistant to natural and
LP gases.

Use ground joint unions and install a drip leg no less than 3²
long to trap dirt and moisture before it can enter gas control
valve inside furnace.

NOTE: In the state of Massachusetts.

1.
2.

Gas supply connections MUST be performed by a licensed plumber or gas fitter).

Provide a 1/8² NPT plugged tapping for test gauge connection
immediately up stream of gas supply connection to furnace.

When flexible connectors are used, the maximum length
shall not exceed 36² (915 mm).

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

When lever handle type manual equipment shutoff
valves are used, they shall be T--handle valves.

NOTE: If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector
which has previously served another gas appliance.

The use of copper tubing for gas piping is NOT approved.

Install gas piping in accordance with local codes, or in the absence of local codes, the applicable national codes.

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

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

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 accessible. Refer to Figure 12.

441 01 2611 06

10. Install correct pipe size for run length and furnace rating.
11. Measure pipe length from gas meter or LP second stage regulator to determine gas pipe size.

Right Side Gas Supply Piping (N8MP)

Figure 15

Gas Valve with Elbows (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.

25--23--22

Assemble the elbows so that the outlet of one(1) 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.
Screw elbow assembly into gas valve far enough to be leak
proof. Position elbow assembly so that the inlet of the elbow is
at the top of the gas valve. An additional 3/8 turn will be required in step 3. Turn open end of inlet elbow to face the left
side of the furnace (1/4 turn), see Figure 14.
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.

Figure 13

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.

Follow steps 2 through 4 Piping with Street Elbows.

WARNING

FIRE HAZARD

Elbows (N8MP)

Left Side Gas Entry (*8MP) (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 (*8MP) (See Figure 16)
25--23--23c

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

Figure 16
Figure 14

Typical Gas Piping (*8MP)

Gas Valve with Elbows (N8MP)

25--23--21a

25--24--35a

441 01 2611 06

Piping with Street Elbows
1.

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

Screw elbow assembly into gas valve far enough to be leak
proof. Position elbow assembly so that the inlet of the elbow is
at the bottom of the gas valve. An additional 1/2 turn will be required in step 3. Turn open end of inlet elbow to face the right
side of the furnace (1/4 turn), see Figure 17.

Figure 17

WARNING

FIRE OR EXPLOSION HAZARD.

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 2²² outside
furnace.

Gas Valve with Elbows (*8MP)

Additional LP Piping Requirements
·

Have a licensed LP gas dealer make all connections at storage 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.
A natural gas or LP gas leak ignited by an open
flame or spark could result in death, personal
injury and/or property damage.
Natural gas is lighter than air and will rise.
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.

25--22--25a--3

Turn assembly an additional 1/2 turn to position inlet near the
top of the gas valve in line with gas opening on right side of
furnace, see Figure 18.

Figure 18

WARNING

Gas Valve with Elbows (*8MP)

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 1/2² psi, isolate the
furnace from the gas supply piping system by closing the
equipment shutoff valve.

b. If test pressure exceeds 1/2² psi, the furnace and its manual
equipment shutoff valve must be disconnected from the gas
supply piping system.

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

Piping with Close Nipples and Standard Elbows

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

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

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

Follow steps 2 through 4 Piping with Street Elbows.

Correct even the smallest leak at once.

441 01 2611 06

9. Electrical Wiring
!

WARNING

ELECTRICAL SHOCK HAZARD.

Failure to follow safety warnings exactly could
result in serious injury, death, and/or property
damage.
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 accordance 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 connection 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
(0.8 amps total for EAC and HUM). Ampacity can be determined
by using the NEC or CEC.
Furnace must be installed so the electrical components are protected from water and connected to its own separate circuit.

J- Box Relocation
N8MPN and N8MPL Models

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 fan 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.

Optional Equipment
All wiring from furnace to optional equipment MUST conform to local codes or, in the absence of local codes, the applicable national
codes. Install wiring in accordance with manufacturer’s instructions.

Humidifier/Electronic Air Cleaner
The furnace is wired for 115 VAC humidifier and/or electronic air
cleaner connection.
NOTE: Do NOT exceed 115V/0.8 amp. maximum current

load for both the EAC terminal and the HUM terminal
combined.

NOTE: The humidifier will be powered when the furnace is fired
and the circulating air blower comes on. The electronic air cleaner
will be powered anytime the thermostat calls for air movement.
However, the electronic air cleaner is NOT energized during continuous fan operation controlled by the electronic fan control.

Figure 19

Electrical Connections

The J--box is installed in blower compartment on left side of casing.
An alternate J--box location on right side can be used.
Remove bag containing two hole plugs and two self--tapping
screws from loose parts bag in blower compartment.

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

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

Move J--box to alternate location and attach using two self-tapping screws from bag.

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

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 and *8MPL 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:

115V. 60Hz.
HOT
NEUT.

G
Connection
Box

Ground
Thermostat
G

Y
W

W R

Low Voltage
Terminal Board

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

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

NOTE: 115 VAC/60Hz/single--phase
Operating voltage range*: 127 max, 104 min.

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

* Permissible limits of voltage at which unit will operate satisfactorily

25--24--33--4

441 01 2611 06

Fan Control

Figure 20

The fan control is preset at the factory with ON delay of 30 seconds
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”.

Fan Timer Connections

Control Center Fuse
The 24V circuit contains a 5--amp, automotive--type fuse located
on control center. (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.).

DIP Switch
FUSE

25--23--41

10. Ductwork and Filter (Upflow/Horizontal)
!

WARNING

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

Design and install air distribution system to comply with Air Conditioning Contractors of America manuals or other approved methods 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 minimize 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
area. It is often advisable to route the return air ducts under the
floor or through the attic.

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.
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 cutting the opening. Side duct connections are NOT permitted in horizontal flow applications.

Figure 21

Duct Design

Refer to furnace Technical Support Manual (Blower Data)
for air flow information.
Size ductwork to handle air flow for heating (and air conditioning if so equipped).

Duct Installation Requirements
·

When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside of the space containing 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.

Cutting Side Return Air Opening

WARNING

CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warning exactly could
result in serious injury, death, and/or property
damage.

Plugged
Starting
Hole

Install cooling coil on furnace discharge. Cool air
passing over heat exchanger could cause condensate to form resulting in heat exchanger failure.
·
·

Upflow and Horizontal Flow: Bottom return--air duct connections 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.
441 01 2611 06

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 dampers 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 furnace 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 conditioning operation, unless damper is in the full heat or cool position.

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 recommended 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 2² of insulation with outdoor type vapor
barrier.

Ductwork installed in an indoor unconditioned space requires
a minimum of 1² 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 can 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

CAUTION

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.
· 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 externally. See Figure 24.

· If return air must be on one side only, an optional 20² x 25²

A filter MUST be used.
Filters are not supplied with these furnaces, but can be purchased
from your distributor.

filter standoff rack kit can be used. (See Figure 22.) For bottom return, an internal filter can be used or a filter rack kit can
be mounted externally.

NOTE: The 20² x 25² 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.

See Table 4 for required high--velocity filter sizes.

Table 4

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

Cabinet

Internal Filter

Width

Bottom

Side+

151/2

14X25

14X25 or 16X25

191/2

16X25*

223/4

20X25*

16X25*

External Filter Rack

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--velocity filters meet the minimum size areas for 300 FPM or less.

Figure 22

Optional Duct Standoff

* 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.

20 x 25 Optional
Filter Rack

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.

Filter

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.

441 01 2611 06

Figure 23

Figure 25

Side Return Filter Rack

Bottom Mounted Filter

Center Clip
side--to--side

9²

Filter

25--23--05--4a

Figure 26

25--24--18--1

Filter Clip Construction

11/2²
3²

Figure 24

Filters Installed on Two Sides
11/4²

Using Two
Filter Racks

26 Ga. Galvanized Steel
11/

25--23--05--3

Filter

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.

16²

NOTE: If filters are only suitable for heating application, advise
homeowner that filter size may need to be increased if air conditioning 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 condensation in the heat exchanger. The coil installation instructions
must be consulted for proper coil location and installation procedures. With a parallel flow arrangement, dampers must be
installed to prevent chilled air from entering the furnace. If manually 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.

11. Ductwork and Filter (Downflow)
!

WARNING

CARBON MONOXIDE POISONING HAZARD.

FIRE HAZARD.

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

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

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.

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.

441 01 2611 06

WARNING

Sub-- Bases for Combustible Floors - Furnace Only

BURN HAZARD.
The vent may be hot. Failure to install vent shield
properly could result in bodily injury.
Install VENT PIPE SHIELD NAHA002VC as
described below.

Vent Shield
Vent shield is required for all downflow installations. 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.

Note: When using the subbase for combustible floors, the discharge 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 restrictions may occur.
The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box.
1.

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 11/4² shorter and 11/8² narrower
than the minimum required size of the opening in the floor.
This is done to maintain a 1² clearance between the floor and
the plenum.

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 furnace to the cased coil.

!
FIRE HAZARD.

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

WARNING

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.
Table 5

Sub--bases for Combustible Floors Dimensions

Sub--base for
Combustible Floors
Part Number

Sub--base for Combustible
Floor Dimensions
H*

Opening In Floor

Opening In
Base For Plenum

Typical Plenum
Dimensions

K**

161/4

145/8

131/2

181/

171/

171/8

16
2113/16

161/

217/

193/

193/4

Subbase for Furnace Only
NAHH001SB

1511/16

283/4

149/16

NAHH002SB

195/

283/

183/

NAHH003SB

16
2215/16

283/

Subbase for Coil Box

*
**

NAHH004SB

1511/16

209/16

149/16

161/4

145/8

131/2

NAHH005SB

195/16

209/16

183/16

161/4

181/4

171/8

NAHH006SB

2215/

209/

2113/

161/

217/

193/

193/4

Outside Dimension
Base Spacer Side To Side

Set the base over the opening in the floor, centering the opening 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.

441 01 2611 06

Exploded View of Sub--Base for
Furnace ONLY

Figure 27

Figure 29

Exploded View of Sub--Base for
Downflow Cased Coil
T

S
Plenum

Plenum

J
K

P
L

2²²

Combustible
Floor Base

K
P
L

1²²

Combustible
Floor Base

2²²

1²²

M
Hole in Floor

Hole in Floor

Setting the Base

Figure 30

Coil Box

Setting the Base

Figure 28

Subbase
Insulation

Furnace
Subbase
Insulation

Wood Floor
Wood Screw
Wood Floor
Wood Screw

Plenum

Sub-- base for Combustible Floors - Downflow Coil
Adapter Box

Plenum

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.

Figure 31

Condensate Line Raised by Base

The subbase for combustible floors is required when a downflow
furnace, used with a downflow coil box, is set on combustible
flooring.
1.

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 ²shorter and 11/8 ² 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 opening 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.

441 01 2611 06

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 connection through the side(s) or back of the furnace is NOT allowed.

Duct Design
Design and install air distribution system to comply with Air Conditioning Contractors of America manuals or other approved methods 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 minimize 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
area. It is often advisable to route the return air ducts under the
floor or through the attic.

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

Size ductwork to handle air flow for heating (and air conditioning, if so equipped).

Ductwork installed in attic or exposed to outside temperatures requires a minimum of 2² of insulation with outdoor
type vapor barrier.

Ductwork installed in an indoor unconditioned space requires a minimum of 1² of insulation with indoor type vapor
barrier.

Filters
A filter MUST be used.
Filters are not supplied with these furnaces, but can be purchased
from your distributor.
See Table 6 for required high--velocity filter sizes.

Table 6

Duct Installation Requirements
·

When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside of the space containing 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.

WARNING

CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warning exactly could
result in serious injury, death, and/or property
damage.
Install cooling coil on furnace discharge. Cool air
passing over heat exchanger could cause
condensate to form resulting in heat exchanger
failure.
·

When a 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 dampers 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 furnace 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 conditioning operation, unless damper is in the
full heat or cool position.

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 recommended 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.

High Velocity Air Filter Sizes (max. 600 FPM)

Cabinet
Width

Internal Filter

External Filter Rack

151/2²

14² X 25²

191/8²

16² X 25²

223/4²

20² X 25²

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.

CAUTION

REDUCED FURNACE LIFE HAZARD

Failure to follow caution instructions may result in
reduced furnace life.
Use of excessively dirty and/or restrictive air filters
may
increase
furnace
operating
temperatures and shorten the life of the furnace.
Filters supplied with 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.
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 filters unless low-velocity filters meet the minimum size areas for 300 FPM or less.

Internal Filter in Top Return Installation
When installing top--mounted filter inside the furnace, install the filter 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 filter into side clips first and push filter back until
it is fully engaged into back clip.

441 01 2611 06

Figure 32

Top Mounted Internal Filter
9²

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

Addition Of Air Conditioning

Center Clip
side--to--side

When a refrigeration coil is used in conjunction with this furnace, it
must be installed on the discharge side of the furnace to avoid condensation on the heat exchanger. The coil installation instructions
must be consulted for proper coil location and installation
procedures. With a parallel flow arrangement, dampers must be
installed to prevent chilled air from entering the furnace. If manually 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.

Figure 33

Filter Clip Construction

11/2²
3²

11/4²

26 Ga. Galvanized Steel

11/

16²

12. Checks and Adjustments
Startup
NOTE: Refer to startup procedures in the Users Information
Manual.

WARNING

ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
Failure to follow safety warnings exactly could
result in serious injury, death, 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.

Gas Supply Pressure
Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers.
(See LP Gas Conversion Kit instruction manual for furnaces converted to LP gas.)

Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners operating.
441 01 2611 06

WARNING

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas at shut off before connecting
manometer could result in death and/or personal
injury.
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 manometer with a 0² to 12² water column range.
Typical Gas Control Valve Honeywell

Figure 34

Supply Pressure
Tap (Hidden)

On/Off
Switch

Manifold Pressure
Adjustment
Diagnostic Light
(Hidden)
(on some models)

Manifold
Pressure
Tap

INLET

Pilot Pressure
Adjustment

OUTLET

25--22--25a

Turn gas ON. Operate the furnace by using a jumper wire on
the R to W thermostat connections on the fan board.

Orifice Sizing

Remove manifold pressure adjustment screw cover on furnace gas control valve. Turn adjusting screw counterclockwise to decrease manifold pressure and clockwise to
increase pressure.

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

Set manifold pressure to value shown in Table 7 or Table 8.

Ensure furnace is equipped with the correct main burner orifices.
Refer to Table 7 or Table 8 for correct orifice size and manifold
pressure for a given heating value and specific gravity for natural
and propane gas.

When the manifold pressure is properly set, replace the adjustment screw cover on the gas control valve.

Operation Above 2000¢ Altitude

Remove jumper wire from thermostat connection on fan
board. Remove manometer connection from manifold pressure tap, and replace plug in manifold.

Check for leaks at plug.

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

FIRE, EXPLOSION,
POISONING HAZARD.

Adjust Pilot Burner
The furnace has a pilot flame to light the main burner. The flame
should surround 3/8² to 1/2² of the flame rod. See Figure 35. To adjust, remove cap from pilot adjusting screw on gas control valve.
Turn screw counterclockwise to increase or clockwise to decrease
flame as required. Replace cap after adjusting screw.

Figure 35

Pilot Burner
Flame Rod

Proper Flame
Adjustment

Hot Surface
Igniter

10--11--65

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.

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.

1,000

No. of Seconds
Per Hour

Time Per Cubic
Foot in
Seconds

3,600

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 altitudes up to 2000¢. When installed above 2000¢, the input must be
decreased 2%(natural) or 4%(LP) for each 1000¢ above sea level.
This may be accomplished 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 7 &
Table 8 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 elevation for the installation is reached. The value in the box at the intersection 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)

High Altitude Multiplier
Natural Gas

LP Gas

2001¢ - 3000¢

0.95

0.90

BTU Per
Hour

3001¢ - 4000¢

0.93

0.86

4001¢ - 5000¢

0.91

0.82

75,000

5001¢ - 6000¢

0.89

0.78

6001¢ - 7000¢

0.87

0.74

7001¢ - 8000¢

0.85

0.70

1,000 x 3,600 ¸ 48 = 75,000 BTUH

Remove jumper wire from R to W1.

Relight all appliances and ensure all pilots are operating.

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

Elevation

Example
Natural Gas
BTU Content

WARNING
CARBON MONOXIDE

* Based on mid--range of elevation.
441 01 2611 06

MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS
NATURAL GAS MANIFOLD PRESSURE (²² w.c.)

Table 7
HEATING
VALUE
at ALTITUDE
BTU/CU. FT.
700
725
750
775
800
825
850
875
900
925
950
975
1000
1050
1100

0 to
2000

MEAN ELEVATION FEET ABOVE SEA LEVEL
3001 to
4001 to
5001 to
4000
5000
6000

2001 to
3000

6001 to
7000

7001 to
8000

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

Orifice
No.

Manifold
Pressure

---------------------------41
41
42
42
42
42

---------------------------3.7
3.5
3.7
3.5
3.2
2.9

---------------------41
42
42
42
42
42
42
42

---------------------3.6
3.7
3.5
3.3
3.2
3.0
2.7
2.5

---------------41
41
42
42
42
42
42
42
42
42

---------------3.7
3.5
3.6
3.4
3.3
3.1
2.9
2.8
2.5
2.3

------------41
41
42
42
42
42
42
42
42
42
43

------------3.6
3.4
3.6
3.4
3.2
3.0
2.9
2.7
2.6
2.3
2.6

---------41
42
42
42
42
42
42
42
42
42
43
----

---------3.6
3.7
3.5
3.3
3.1
2.9
2.8
2.6
2.5
2.4
2.6
----

---41
41
42
42
42
42
42
42
42
42
42
43
-------

---3.7
3.5
3.6
3.4
3.2
3.0
2.8
2.7
2.5
2.4
2.3
2.7
-------

41
41
42
42
42
42
42
42
42
42
43
43
43
-------

3.7
3.4
3.6
3.3
3.1
2.9
2.8
2.6
2.5
2.3
2.7
2.6
2.4
-------

NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI
Z223.1--2002/NFPA 54--2002 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1--00.

Table 8

LPG or PROPANE GAS MANIFOLD PRESSURE (²² w.c.)

HEATING VALUE
at ALTITUDE
BTU/CU. FT.
2500
Orifice Size

0 to
2000
10.0
#54

2001 to
3000
10.0
#54

MEAN ELEVATION FEET ABOVE SEA LEVEL
3001 to
4001 to
5001 to
4000
5000
6000
9.0
10.0
9.4
#54
#55
#55

6001 to
7000
8.5
#55

7001 to
8000
10.0
#56

NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1--2002/NFPA
54--2002 or National Standard Of Canada, Natural Gas And Propane Installation Code CSA B149.1--00.

NOTE: The derating of these furnaces at 2% (Natural Gas) and
4% (Propane Gas) has been tested and design--certified by CSA.

Figure 36

High Altitude Air Pressure Switch

Removing NOx inserts

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

WARNING

CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning could result in
property damage, personal injury and/or death.
NOx inserts for use with Natural Gas units ONLY. If
LP Gas is required, NOx inserts must be
removed.

Changing Orifices
1.

After disconnecting power and gas supply to the furnace, remove the burner compartment door, exposing the burner
compartment.

Disconnect gas line and pilot tubing from gas valve so manifold can be removed.

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

441 01 2611 06

25--40--03

Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do not discard any screws.
See Figure 37.

Carefully remove the manifold assembly.

Remove the orifices from the manifold and replace them with
proper sized orifices. See Figure 38.

Tighten orifices so they are seated and gas--tight. See
Figure 38.

Figure 37

Figure 39

Manifold

Main Burner
Burner Face

10--10--78

Some Models may vary

Air Temperature Rise Check

25--23--51z

CAUTION

REDUCED FURNACE LIFE HAZARD
Figure 38

Clearances
Measure from face of orifice to the
back side of the manifold.

29.3 +1.5 mm
--1.1
1.21²
1.11²

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

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

Main Burner Flame Check
Allow the furnace to run approximately 10 minutes. Then inspect
the main burner and pilot flames. See Figure 39.
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 necessary to adjust gas pressures or check for drafts.

Failure to properly set the air temperature rise may
result in reduced furnace life.
U ONLY th
Use
the blower
bl
motor
t speed
d taps
t
marked
k d “Y” for
f
YES for setting air temperature rise.
Blower Motor Speed Taps for
N8MPN/L and *8MPN/L Model Sizes
Model Sizes

050B12
075B12
075F16
100F14
100F20
100J20
100J22
125J20
125J22+
150J20Ö
+N8MPN only

LO
RED

M LO
BLUE

M HI
ORN

HI
BLK

N
N
N
N
N
N
Y
N
Y
N

Y
Y
N
N
Y
Y
Y
Y
Y
Y

Y
Y
Y
Y
Y
Y
Y
Y
Y
Y

N
Y
Y
Y
Y
Y
N
Y
Y
Y

Ö *8MPN only

The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate. Temperature rise is the difference between supply and return air temperatures.
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.

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.

Take readings and compare with range specified on rating
plate.

If the air temperature rise is not in the correct range, the blower speed must be changed. A higher blower speed will lower
the temperature rise. A lower blower speed will increase the
temperature rise.

Remove the jumper wire after the adjustments are complete.
441 01 2611 06

Changing Blower Speed

WARNING

ELECTRICAL SHOCK HAZARD.

Failure to disconnect power could result in death,
personal injury and/or property damage.
Turn OFF power to furnace before changing speed
taps.

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
“Unused Motor Lead” 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 “Unused Motor Lead” location.

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.

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

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.

Continuous-- Fan Operation

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 fan control
as well as location of unused blower motor speed leads. Use
the chart (Table 9 ) to determine the blower motor speed settings.

Table 9

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 replace it with the desired motor speed lead from the “Unused
Motor Lead” location. Connect the wire previously removed
from the “Heat” or “Cool” terminal to the vacated “Unused
Motor Lead” terminal.

A terminal is provided on the electronic fan control located in the
circulating air blower compartment for operation of the continuous--fan option. This connection is intended for the low speed motor 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.
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of operation.

Separate speed selections for Heat, Cool, and
Continuous-- Fan
Connect low speed lead from circulating air motor to the “Cont”
terminal at the electronic fan control. 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 electronic fan control.
Note: There should be only ONE motor lead going to the “Heat”
and “Cont” terminals.

13. Furnace Maintenance
!

WARNING

FIRE, EXPLOSION, OR CARBON MONOXIDE
POISONING HAZARDS

ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD

Failure to have the furnace inspected and
maintained could result in death, bodily injury,
and/or property damage.

Failure to follow safety warnings exactly could
result in dangerous operation, serious injury,
death 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.

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.

See “User’s Information Manual”.

441 01 2611 06

14. Sequence of Operation & Diagnostics
The following is the normal operating sequence.

Cooling (Y) Request:
24 VAC signals applied to Y & G terminals of EFT (electronic fan timer) control.
· Cool motor speed is energized after 5 second Cool Fan On Delay time.
Y & G signals removed from EFT.

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

Continuous Circulating Fan (G) Request:
24 VAC signals applied to G terminals of EFT control.

· Heat motor speed is energized without delay.
G signal removed from EFT.

· Heat motor speed is de--energized without 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 EFT, 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.

Heating (W) Request:
24 VAC signals applied to W terminal of EFT control.
· Inducer motor turns on.
· Following a 3 second prepurge delay, the pilot gas valve opens and the igniter begins to warm up.
· After the pilot lights, the gas control valve is energized and main burners light.
· Timed from the opening of the main gas control valve, the furnace control will delay blower operation for the Heat Fan On Delay
time. W signal removed from EFT.
· The gas valve de--energizes and the main burners go out.
· The inducer runs for a 30 second postpurge period.
· The fan stays at Heat speed.
· Timed from the gas valve de--energizing, the circulating fan de--energizes after the selected Heat Fan Delay time expires.

Heating Request with Gas Shut Off:
24 VAC signals applied to W1 terminal of EFT control.
· Inducer motor turns on.
· Following a 3 second prepurge delay, the pilot valve opens and the igniter begins to warm up.
· The igniter glows red--hot for 30 seconds, then turns off.
· The igniter stays off for 25 seconds, then begins to warm--up again.
· The igniter glows red--hot for 30 seconds, then turns off.
· The pilot valve closes 3 seconds after the igniter de--energizes.
· The inducer de--energizes 5 seconds after the pilot valve closes.
· The SmartValve proceeds to soft lockout and flashes error code 6.
· The control exits soft lockout after 5 minutes and begins another ignition sequence.

441 01 2611 06

Gas Control Valve Diagnostic Codes (See Figure 40)
OFF
Heartbeat
1 Flash
2 Flashes
3 Flashes

=
=
=
=
=

4 Flashes
5 Flashes
6 Flashes + 1 Note 1
6 Flashes + 2 Notes 1,2

=
=
=
=

6 Flashes + 3 Notes 1,2 =
6 Flashes + 4 Notes 1,2 =
7 Flashes
=

Control not powered
Normal Operation (Standby or call for heat)
Not used
Low Pressure switch closed when should be open
Low Pressure switch circuit was still sensed as open 30 seconds after the inducer was energized. System
is in 5 minute delay mode, with inducer off. After 5--minute delay, a new ignition sequence will be initiated.
(Note: SV9541M On/Off switch in off position during a call for heat will generate this diagnostic code)
Limit switch string open
Flame sensed out of sequence -- Flame signal still present.
Soft Lockout --Maximum retry count exceeded (failed to light within 4 trials for ignition)
Soft Lockout --Maximum recycle count exceeded -- Last failure was Flame Sense Lost During Run, Cycling
Pressure Switch or Blocked Condensate.
Soft Lockout --Maximum recycle count exceeded -- Last failure was Airflow Proving Circuit Opened
During Run
Soft Lockout --Maximum recycle count exceeded -- Last failure was Limit Circuit Opened During Run
Soft Lockout Due to Limit Trips Taking Longer than 2 minutes to Reset; Auto Reset After 1 Hour if
Call for Heat Still Present. Reset by Cycling Call for Heat at Any Time.

NOTE 1: The 6 + X designation indicates a combination of flash codes: 6 flashes shows the control is in soft lockout, followed by X flashes
to indicate the reason the control went into soft lockout. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence
after a five minute delay period, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence immediately.
NOTE 2: Any combination of 5 ‘abnormal’ events during a single call for heat will result in soft lockout. An ‘abnormal’ event is a Flame
Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code will indicate which
was the last ‘abnormal’ event that put the system into the soft lockout state based on the table above.

Typical Gas Control Valve Honeywell

Figure 40

Manifold Pressure
Adjustment
Supply
(Hidden)
Pressure
Tap (Hidden)

Diagnostic Light
(on some models)

On/Off
Switch
Manifold
Pressure
Tap

INLET

Pilot Pressure
Adjustment

OUTLET

25--22--25a

441 01 2611 06

Save This Manual For Future Reference

Models
N8MPN050B12A1
N8MPN075B12A1
N8MPN075F16A1
N8MPN100F14A1
N8MPN100F20A1
N8MPN100J22A1
N8MPN125J20A1
N8MPN125J22A1

N8MPL050B12A1
N8MPL075B12A1
N8MPL075F16A1
N8MPL100F20A1
N8MPL100J22A1
N8MPL125J20A1
N8MPL125J22A1

*8MPN050B12A1
*8MPN075B12A1
*8MPN075F16A1
*8MPN100F14A1
*8MPN100F20A1
*8MPN100J20A1
*8MPN125J20A1
*8MPN150J20A1

*8MPL050B12A1
*8MPL075B12A1
*8MPL075F16A1
*8MPL100F20A1
*8MPL100J20A1
*8MPL125J20A1

* Denotes Brand

International Comfort Products, LLC
Lewisburg, TN 37091
Fast Parts Division
(866) 380--3278

441 01 2611 06

Model Specifications
Manufacturers Number (Mfr No - See Rating Plate)
ALL Models (N8MPN)
Specifications
N8MPN
050B12

N8MPN
075B12

N8MPN
075F16

N8MPN
100F14

N8MPN
100F20

N8MPN
100J22

N8MPN
125J20

N8MPN
125J22

General
Input (Btuh)
Output (Btuh)
Temp. Rise (°F)

50,000
40,000
35--65

75,000
60,000
35--65

75,000
60,000
25--55

100,000
80,000
30--60

100,000
80,000
35--65

100,000
81,000
30--60

125,000
100,000
30--60

Electrical (Volts/Hz)

115/60

Rating Plate Amps.

8.8

9.5

10.1

9.6

13.6

12.3

13.6

11.5

Gas Type

Nat

Transformer Size (VA)
T’stat Heat Anticipator

40
.10

Gas & Ignition
Std. Main Orifices (No/Size)

2/#42

2/#54

3/#42

3/#54

3/#42

3/#54

4/#42

4/#54

4/#42

4/#54

4/#42

4/#54

5/#42

5/#54

5/#42

5/#54

Gas Valve Honeywell SV
Regulation Type
Manifold Press. (Inch’s WC)

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

Pilot Orifice Size
Ignition Type/Series
Lock--Out Time

HW HSP
NA

300
See Parts List

1013529
--0.69
--0.59

HW ST9160
30
60,100,140,180

11--8
PSC/1/2
10/370
Washable
14x25x1
---1.5
3

11--8
PSC/1/2
7.5/370
Washable
14x25x1
---1.5
3

11--10
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
4

11--10
PSC/1/2
7.5/370
Washable
16x25x1
---2
3.5

11--10
PSC/1/2
10/370
Washable
16x25x1 (2)
16x25x1 (2)
3
5

11--10
PSC/3/4
40/370
Washable
20x25x1
16x25x1 (2)
3
5.5

11--10
PSC/1/2
10/370
Washable
20x25x1
16x25x1 (2)
3
5

11--10
PSC/3/4
40/370
Washable
20x25x1
16x25x1 (2)
3
5.5

Combustion
Flue Outlet Size (Inches)
Limits & Controls
Thermal Sensor (°F)
Limit Control
Std. Pressure Sw. (Part No)
Press (Close)
Press (Open)
Fan Control (Type)
Fan Control
On
(Timed--secs)
Off
Blower Data
Type & Size
Motor Type/H.p.
Cap. Mfd/Volts
Filter Type (600 FPM)
Filter Size (²) (Not Supplied)
1600 CFM and over#
Min. Cool Cap. (Tons)
Max. Cool Cap. (Tons)

Gas Conversion Kits
Nat to LP NAHL002LP or *1160991
LP to Nat NAHF002NG, *1009510
* Must be ordered from Service Parts
Note: Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE

441 01 2611 06

Manufacturers Number (Mfr No - See Rating Plate)
ALL Models (N8MPL)
Specifications
N8MPL
050B12

N8MPL
075B12

N8MPL
075F16

N8MPL
100F20

N8MPL
100J22

N8MPL
125J20

N8MPL
125J22

General
Input (Btuh)
Output (Btuh)
Temp. Rise (°F)

50,000
40,000
35--65

75,000
60,000
35--65

75,000
60,000
25--55

100,000
80,000
35--65

100,000
80,000
30--60

125,000
100,000
30--60

Electrical (Volts/Hz)

115/60

Rating Plate Amps/

8.8

9.5

10.1

13.6

12.3

13.6

11.5

Gas Type

Nat

Transformer Size (VA)
T’stat Heat Anticipator

40
.10

Gas & Ignition
Std. Main Orifices (No/Size)

2/#42

2/#54

3/#42

3/#54

3/#42

3/#54

4/#42

4/#54

4/#42

4/#54

5/#42

5/#54

5/#42

5/#54

Gas Valve Honeywell SV
Regulation Type
Manifold Press. (Inch’s WC)

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

Pilot Orifice Size
Ignition Type/Series
Lock--Out Time

HW HSP
NA

300
See Parts List

1013529
--0.69
--0.59

HW ST9160
30
60,100,140,180

11--8
PSC/1/2
10/370
Washable
14x25x1
---1.5
3

11--8
PSC/1/2
7.5/370
Washable
14x25x1
---1.5
3

11--10
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
4

11--10
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
5

11--10
PSC/3/4
40/370
Washable
20x25x1
16x25x1 (2)
3
5.5

11--10
PSC/1/2
10/370
Washable
20x25x1
16x25x1 (2)
3
5

11--10
PSC/3/4
40/370
Washable
20x25x1
16x25x1 (2)
3
5.5

Note: Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

441 01 2611 06

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE

Manufacturers Number (Mfr No - See Rating Plate)
ALL Models (*8MPN)
Specifications
*8MPN
050B12

*8MPN
075B12

*8MPN
075F16

*8MPN
100F14

*8MPN
100F20

*8MPN
100J20

*8MPN
125J20

*8MPN
150J20

General
Input (Btuh)
Output (Btuh)
Temp. Rise (°F)

50,000
40,000
35--65

75,000
60,000
30--60

100,000
81,000
35--65

125,000
101,000
35--65

150,000
121,000
35--65

Electrical (Volts/Hz)

115/60

Rating Plate Amps.

8.8

9.5

10.1

9.9

13.9

12.6

13.9

Gas Type

Nat

Transformer Size (VA)
T’stat Heat Anticipator

40
.30

Gas & Ignition
Std. Main Orifices (No/Size)

2/#42

2/#54

3/#42

3/#54

3/#42

3/#54

4/#42

4/#54

4/#42

4/#54

4/#42

4/#54

5/#42

5/#54

6/#42

6/#54

Gas Valve Honeywell SV
Regulation Type
Manifold Press. (Inch’s WC)

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

Pilot Orifice Size
Ignition Type/Series
Lock--Out Time

HW HSP
NA

300
See Parts List
130

1013529
--0.69
--0.59

HW ST9160
30
60,100,140,180

11--8
PSC/1/2
10/370
Washable
14x25x1
---1.5
3

11--8
PSC/1/2
7.5/370
Washable
14x25x1
---1.5
3

11--10
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
4

11--10
PSC/1/2
7.5/370
Washable
16x25x1
---2
3.5

11--10
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
5

11--10
PSC/1/2
10/370
Washable
20x25x1
16x25x1 (2)
3
5

12--12
PSC/3/4
40/370
Washable
20x25x1
16x25x1 (2)
3
5

Combustion
Flue Outlet Size (Inches)
Limits & Controls
Thermal Sensor (°F)
Limit Control
Auxiliary Limit (°F)
Std. Pressure Sw. (Part No)
Press (Close)
Press (Open)
Fan Control (Type)
Fan Control
On
(Timed--secs)
Off
Blower Data
Type & Size
Motor Type/H.p.
Cap. Mfd/Volts
Filter Type (600 FPM)
Filter Size (²) (Not Supplies)
1600 CFM and over#
Min. Cool Cap. (Tons)
Max. Cool Cap. (Tons)

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE

441 01 2611 06

Manufacturers Number (Mfr No - See Rating Plate)
ALL Models (*8MPL)
Specifications
*8MPL
050B12

*8MPL
075B12

*8MPL
075F16

*8MPL
100F20

*8MPL
100J20

*8MPL
125J20

General
Input (Btuh)
Output (Btuh)
Temp. Rise (°F)

50,000
40,000
35--65

75,000
60,000
30--60

100,000
81,000
35--65

125,000
101,000
35--65

Electrical (Volts/Hz)

115/60

Rating Plate Amps.

8.8

9.5

10.1

13.9

12.6

13.9

Gas Type

Nat

Transformer Size (VA)
T’stat Heat Anticipator

40
.30

Gas & Ignition
Std. Main Orifices (No/Size)

2/#42

2/#54

3/#42

3/#54

3/#42

3/#54

4/#42

4/#54

4/#42

4/#54

5/#42

5/#54

Gas Valve Honeywell SV
Regulation Type
Manifold Press. (Inch’s WC)

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

9541
SNAP
3.5

9541
SNAP
10.0

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

.018

.011

Pilot Orifice Size
Ignition Type/Series
Lock--Out Time

HW HSP
NA

300
See Parts List
130

Std. Pressure Sw. (Part No)
Press (Close)
Press (Open)

1013529
--0.69
--0.59

Fan Control (Type)
Fan Control
On delay
(Timed--secs)
Off delay

HW ST9160
30
60,100,140,180

11--8
10.3/1100
PSC/1/2
10/370
Washable
14x25x1
---1.5
3

11--8
8/1050
PSC/1/2
7.5/370
Washable
14x25x1
---1.5
3

11--10
10.3/1100
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
4

11--10
10/1050
PSC/1/2
10/370
Washable
16x25x1
16x25x1 (2)
3
5

11--10
11.9/900
PSC/1/2
10/370
Washable
20x25x1
16x25x1 (2)
3
5

11--10
10/1050
PSC/1/2
10/370
Washable
20x25x1
16x25x1 (2)
3
5

Combustion
Flue Outlet Size (Inches)
Limits & Controls
Thermal Sensor (°F)
Limit Control
Auxiliary Limit (°F)

Blower Data
Type & Size
Motor Amps/Rpm
Motor Type/H.p.
Cap. Mfd/Volts
Filter Type
Filter Size (²) (Not Supplied)
1600 CFM and over#
Min. Cool Cap. (Tons)
Max. Cool Cap. (Tons)
Gas Conversion Kits
Nat to LP NAHL002LP or *1160991
LP to Nat NAHF002NG, *1009510
* Must be ordered from Service Parts

# Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

441 01 2611 06

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE

15. Circulation Air Blower Data

TAP

LOW

MED L

MED H

HIGH

.10

472

704

1167

1387

.30

365

638

1102

1288

.50

290

572

1035

1194

.70

209

522

939

1070

.90

463

443

820

937

1.00

413

370

753

858

Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

695

963

1220

1559

.30

644

928

1183

1463

.50

588

873

1118

1361

.70

540

771

1017

1239

.90

463

675

900

1083

1.00

413

615

835

998

(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

598

841

1427

1861

.30

400

748

1384

1770

.50

289

667

1343

1677

.70

236

582

1254

1547

.90

------

477

1129

1360

1.00

------

436

1016

1262

Exterrnal Static Pressure
Inches of W.C.

N8MPN100F14 & *8MPN100F14 * Denotes Brand
Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

770

949

1328

1760

.30

648

873

1235

1675

.50

544

772

1115

1551

.70

457

684

1036

1404

.90

361

572

895

1215

1.00

308

507

811

1093

Exterrnal Static Pressure
Inches of W.C.

N8MPN/L100F20 & *8MPN/L100F20 * Denotes Brand
Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

831

1125

1582

2216

.30

814

1123

1588

2179

.50

781

1117

1577

2074

.70

717

1053

1541

1909

.90

609

964

1373

1745

1.00

561

888

1307

1641

NOTE: 075F16 -- Reduce airflow by 5% if bottom return only
100F20 -- Reduce airflow by 10% if bottom return only
125J20 -- Reduce airflow by 5% if bottom return only

(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

773

1045

1453

2147

.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

Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

1785

1997

2292

2519

.30

1741

1941

2206

2410

.50

1674

1861

2097

2284

.70

1581

1749

1965

2121

.90

1428

1597

1793

1928

1.00

1326

1478

1667

1814

N8MPN/L125J20 & *8MPN/L125J20 * Denotes Brand

Air Delivery in Cubic Feet per Minute (C.F.M.)
Exterrnal Static Pressure
Inches of W.C.

Exterrnal Static Pressure
Inches of W.C.

N8MPN/L075F16 & *8MPN/L075F16 * Denotes Brand

Air Delivery in Cubic Feet per Minute (C.F.M.)

N8MPN/L100J22

Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

860

1149

1666

2147

.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

N8MPN/L125J22
Exterrnal Static Pressure
Inches of W.C.

Exterrnal Static Pressure
Inches of W.C.

N8MPN/L075B12 & *8MPN/L075B12 * Denotes Brand

Exterrnal Static Pressure
Inches of W.C.

(Furnace Rated @0.5²² WC ESP)

Exterrnal Static Pressure
Inches of W.C.

Air Delivery in Cubic Feet per Minute (C.F.M.)

*8MPN/L100J20 * Denotes Brand

Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

1901

2121

2362

2463

.30

1833

2033

2244

2385

.50

1745

1936

2100

2217

.70

1624

1773

1894

2033

.90

1442

1569

1714

1821

1.00

1329

1455

1583

1685

*8MPN150J20 * Denotes Brand
Exterrnal Static Pressure
Inches of W.C.

Exterrnal Static Pressure
Inches of W.C.

N8MPN/L050B12 & *8MPN/L050B12 * Denotes Brand

Air Delivery in Cubic Feet per Minute (C.F.M.)
(Furnace Rated @0.5²² WC ESP)

TAP

LOW

MED L

MED H

HIGH

.10

1656

1915

2168

2385

.30

1583

1787

2090

2335

.50

1507

1697

1997

2212

.70

1390

1596

1856

2085

.90

1212

1445

1654

1898

1.00

1125

1337

1561

1777

NOTE: N8MPN/L125J22 -- Reduce airflow by 10% if bottom return only
*8MPN/L150J20 -- Reduce airflow by 10% if bottom return only

THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE

441 01 2611 06

Wiring Diagram N8MPN/L, *8MPN/L

441 01 2611 06

Parts for N8MPN/L

2
CC

BB
18

N
9

17
E

16
10

8
V

15 16
T

S
J

7 6
H

L
11
R

12
13
K

25--24--32a--1

441 01 2611 06

Replacement Parts - N8MPN (Natural Gas)
Models -- N8MPN050B12A1, N8MPN075B12A1, N8MPN075F16A1, N8MPN100F14A1, N8MPN100F20A1, N8MPN100J22A1,
N8MPN125J20A1, N8MPN125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional Parts

N8MPN

Part
Number

050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
22A1

125J
20A1

125J
22A1

Heat Exchanger

1013623
1013624
1013625
1013626
1013627
1013628

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Switch, Pressure

1013529

Wheel, Blower

1013011
1011420

1
--

-1

Mount, Motor kit*

1014824
1014823
1014822

1
---

--1

-1
--

Mtr, Blor 1/115 1/2 CCW
1/115 1/2 CCW
1/115 1/2 CCW
1/115 3/4 CCW

1172490
1172487
1172488
1172489

1
----

-1
---

1
----

-1
---

--1
--

---1

--1
--

---1

Capacitor

1014397
1014396
1014395

1
---

-1
--

1
---

-1
--

1
---

--1

1
---

--1

Transformer

1012722

Control, Fan Timer

1014460

Switch, Interlock

1012351

Burner Assembly

1008723
1008724
1008725
1008726

1
----

-1
---

--1
--

---1

Pilot/Igniter

1008731

Ignitor/Sensor w/Clip

1009524

Orifice, Pilot .018

503211

Orifice, Burner # 42

1011351

Valve, Gas

1013350

Switch, Limit (Rollout)

1013102

Switch, Limit (Main)

1008417
1320362
34335000

-1
--

--1

1
---

-1
--

--1

-1
--

Blower, Combustion

1014433

*See Table below for bellyband location on motor
Bellyband Location
on Motor
Model N8MPN

A(in.)

050B12A1

1.38²

075B12A1

1.38²

075F16A1

1.38²

100F14A1

1.38²

100F20A1

1.81²

100J22A1

1.65²

125J20A1

1.81²

125J22A1

1.65²

441 01 2611 06

Replacement Parts - N8MPN (Natural Gas)
Models -- N8MPN050B12A1, N8MPN075B12A1, N8MPN075F16A1, N8MPN100F14A1, N8MPN100F20A1, N8MPN100J22A1,
N8MPN125J20A1, N8MPN125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Non- Functional Parts

Part
Number

N8MPN
050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
22A1

125J
20A1

125J
22A1

Panel, Top

1013995
1013996
1013997

1
---

-1
--

--1

Box, Junction

1012349

Cover, Junction box

1012350

Partition, Blower

1014009
1014010
1014011

1
---

-1
--

--1

Housing, Blower

1012972
1012888

1
--

-1

Hanger, Blower

Panel, Blower Cutoff

1012328

721020013
721020008

1
--

-1

Clamp, Capacitor

1170643
1014315

1
--

-1

1
--

-1

Bracket, Control Mounting

1013677

Tube, Pilot

1014021
1014023
1014022

1
---

-1
--

--1

Door, Blower

1014380
1014381
1014382

1
---

-1
--

--1

Bracket, Door

1014271
1014272
1014273

1
---

--1

Door, Louver

1014102
1014107
1014112

1
---

-1
--

--1

Manifold, Gas

1012787
1012788
1012789
1012790

1
----

-1
---

--1
--

---1

Bracket, Pilot

1010901

Bracket, Manifold Support

1012377

Top, Burner Box

1013702
1013703
1013704

1
---

-1
--

--1

Bracket, Burner Box Sides

1012532

Baffle, Burner Box

1012338
1012339
1012340

1
---

-1
--

--1

Bottom, Burner Box

1012334
1012335
1012336

1
---

-1
--

--1

Collector Box

1013010
1012735
1012736
1012739
1012738
1012740

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Gasket, Combustion Blower

1013540

441 01 2611 06

Replacement Parts - N8MPN (Natural Gas)
Models -- N8MPN050B12A1, N8MPN075B12A1, N8MPN075F16A1, N8MPN100F14A1, N8MPN100F20A1, N8MPN100J22A1,
N8MPN125J20A1, N8MPN125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Non- Functional Parts

Partition, Frt Ht Exchanger

Part
Number

N8MPN
050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
22A1

125J
20A1

125J
22A1

1013780
1013781
1013782
1013783
1013784
1013785

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Gaskets, Heat Exchanger

1013991
1013992
1013993
1013994

2
----

-2
---

--2
--

---2

Tubing, Silicone

1014519

)(

Parts Not Illustrated

)(

Fuse, 5 Amp

1083348

)(

Harness, Wire

1013695

)(

Door Screw

1014488

)(

Door Screw Grommet

1171990

)(

Manual, Installation & Tech

44101261105

)(

Manual, Users

44102201004

441 01 2611 06

Replacement Parts - N8MPL (Natural Gas)
Models -- N8MPL050B12A1, N8MPL075B12A1, N8MPL075F16A1, N8MPL100F20A1, N8MPL100J22A1, N8MPL125J20A1,
N8MPL125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

N8MPL
050B12A1

075B12A1

075F16A1

100F20A1

100J22A1

125J20A1

125J22A1

Heat Exchanger

1014322
1014323
1014324
1014325
1014326
1014327

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Switch, Pressure

1013529

Wheel, Blower

1013011
1011420

1
--

-1

Mount, Motor kit*

1014824
1014823
1014822

1
---

--1

-1
--

Mtr, Blower

1172490
1172487
1172488
1172489

1
----

-1
---

1
----

--1
--

---1

--1
--

---1

Capacitor

1014397
1014396
1014395

1
---

-1
--

1
---

--1

1
---

--1

Transformer

1012722

Control, Fan Timer

1014460

1/115 1/2 CCW
1/115 1/2 CCW
1/115 1/2 CCW
1/115 3/4 CCW

Switch, Interlock

1012351

Burner Assembly

1008723
1008724
1008725
1008726

1
----

-1
---

--1
--

---1

Pilot/Igniter

1008731

Ignitor/Sensor with Clip

1009524

Orifice, Pilot .018

503211

Orifice, Burner # 42

1011351

Valve, Gas

1013350

Switch, Limit (Rollout)

1013102

Switch, Limit (Main)

1008417
1320362
34335000

-1
--

--1

1
---

-1
--

--1

-1
--

Blower, Combustion

1013517
1014433

-1

1
--

*See Table below for bellyband location on motor
Bellyband Location
on Motor
Model N8MPL

A(in.)

050B12A1

1.38²

075B12A1

1.38²

075F16A1

1.38²

100F20A1

1.81²

100J22A1

1.65²

125J20A1

181²

125J22A1

1.65²

441 01 2611 06

Replacement Parts - N8MPL (Natural Gas)
Models -- N8MPL050B12A1, N8MPL075B12A1, N8MPL075F16A1, N8MPL100F20A1, N8MPL100J20A1, N8MPL100J22A1,
N8MPL125J20A1, N8MPL125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

N8MPL
050B
12A1

075B
12A1

075F
16A1

100F
20A1

100J
22A1

125J
20A1

125J
22A1

Panel, Top

1013995
1013996
1013997

1
---

-1
--

--1

Box, Junction

1012349

Cover, Junction box

1012350

Partition, Blower

1014009
1014010
1014011

1
---

-1
--

--1

Housing, Blower

1012972
1012888

1
--

-1

Hanger, Blower

1012328

Panel, Blower Cutoff

721020013
721020008

1
--

-1

Clamp, Capacitor

1170643
1014315

1
--

-1

1
--

-1

Bracket, Control Mounting

1013677

Tube, Pilot

1014021
1014023
1014022

1
---

-1
--

--1

Door, Blower

1014380
1014381
1014382

1
---

-1
--

--1

Bracket, Door

1014271
1014272
1014273

1
---

-1
--

--1

Door, Louver

1014102
1014107
1014112

1
---

-1
--

--1

Manifold, Gas

1012787
1012788
1012789
1012790

1
----

-1
---

--1
--

---1

Bracket, Pilot

1010901

Bracket, Manifold Support

1012377

Top, Burner Box

1013702
1013703
1013704

1
---

-1
--

--1

Bracket, Burner Box Sides

1012532

Baffle, Burner Box

1012338
1012339
1012340

1
---

-1
--

--1

Bottom, Burner Box

1012334
1012335
1012336

1
---

-1
--

--1

Collector Box

1013010
1012735
1012736
1012739
1012738
1012740

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Gasket, Combustion Blower

1013540

441 01 2611 06

Replacement Parts - N8MPL (Natural Gas)
Models -- N8MPL050B12A1, N8MPL075B12A1, N8MPL075F16A1, N8MPL100F20A1, N8MPL100J20A1, N8MPL100J22A1,
N8MPL125J20A1, N8MPL125J22A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Partition, Frt Ht Exchanger

Part
Number

N8MPL
050B
12A1

075B
12A1

075F
16A1

100F
20A1

100J
20A1

100J
22A1

125J
20A1

125J
22A1

1013780
1013781
1013782
1013783
1013784
1013785

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Gaskets, Heat Exchanger

1013991
1013992
1013993
1013994

2
----

-2
---

--2
--

---2

Tubing, Silicone

1014519

Baffle, Nox

1014019

)(

Part Not Illustrated

)(

Fuse, 5 Amp

1083348

)(

Harness, Wire

1013695

)(

Door Screw

1014488

)(

Door Screw Grommet

1171990

)(

Manual, Installation & Tech

44101261105

)(

Manual, Users

44102201004

441 01 2611 06

Parts for *8MPN/L
A

2
CC
BB

B
C

17
16

Z
N

S
W

10
14

U
F

S
G

11
R

13
4

K
8

5
7

6
H

25--23--49a

441 01 2611 06

Replacement Parts - *8MPN (Natural Gas)
Models -- *8MPN050B12A1, *8MPN075B12A1, *8MPN075F16A1, *8MPN100F14A1, *8MPN100F20A1, *8MPN100J20A1,
*8MPN125J20A1, *8MPN150J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPN
050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
20A1

125J
20A1

150J
20A1

Heat Exchanger

1013551
1013519
1013550
1013552
1013553
1013554
1013555

1
-------

-1
------

--1
-----

---1
----

----1
---

-----1
--

------1

Switch, Pressure

1013529

Wheel, Blower

1013011
1011420
1011433

1
---

-1
--

--1

Mount, Motor kit*

1014824
1014823
1014822

1
---

--1

-1
--

--1

Motor, Blr

1172490
1172487
1172488
1172489

1
----

-1
---

1
----

-1
---

--1
--

---1

Capacitor

1014397
1014396
1014395

1
---

-1
--

--1

Transformer

1012722

Control, Fan Timer

1014460

Switch, Interlock

1012351

Burner Assembly

1008723
1008724
1008725
1008726
1009179

1
-----

-1
----

--1
---

---1
--

----1

1/115 1/2 CCW
1/115 1/2 CCW
1/115 1/2 CCW
1/115 3/4 CCW

Pilot/Igniter

1008731

Ignitor/Sensor with Clip

1009524

Orifice, Pilot .018

503211

Orifice, Burner # 42

1011351

Valve, Gas

1013350

Switch, Limit (Rollout)

1013102

Switch, Limit (Main)

1320362
1065294
1008417
34335000

--1
--

1
----

--1
--

---1

1
----

-1
---

Blower, Combustion

1014433
1013517

1
--

-1

*See Table below for bellyband location on motor
Bellyband Location
on Motor
Model *8MPN

A(in.)

050B12A1

1.38²

075B12A1

1.38²

075F16A1

1.38²

100F14A1

1.38²

100F20A1

1.81²

100J20A1

1.81²

125J20A1

1.81²

150J20A1

1.65²

441 01 2611 06

Replacement Parts - *8MPN (Natural Gas)
Models -- *8MPN050B12A1, *8MPN075B12A1, *8MPN075F16A1, *8MPN100F14A1, *8MPN100F20A1, *8MPN100J20A1,
*8MPN125J20A1, *8MPN150J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPN
050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
20A1

*125J
20A1

150J
20A1

Panel, Top

1013982
1013983
1013984

1
---

-1
--

--1

Box, Junction

1012349

Cover, Junction box

1012350

Partition, Blower

1014009
1014010
1014011
1014013

1
----

-1
---

--1
--

---1

Housing, Blower

1012972
1012888
1012889

1
---

-1
--

--1

Hanger, Blower

Panel, Blower Cutoff

1012328

721020013
721020008
721020015

1
---

-1
--

--1

Clamp, Capacitor

1170643
1014315

1
--

-1

Bracket, Control Mounting

1013677

Tube, Pilot

1013596
1013597
1013598
1013599

1
----

-1
---

--1
--

---1

Door, Blower (Heil/Arco)
(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(Tempstar Only)
(Tempstar Only)
(Tempstar Only)

1014001
1014375
1014376
1014079
1014349
1014352
1014058
1014068
1014073

1
--1
--1
---

-1
--1
--1
--

--1
--1
--1

Bracket, Door

1014271
1014272
1014273
1014274

1
----

-1
---

--1
--

---1

Door, Louver (Heil/Arco)
(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(Tempstar Only)
(Tempstar Only)
(Tempstar Only)

1014088
1014091
1014094
1014078
1014081
1014085
1014057
1014067
1014072

1
--1
--1
---

-1
--1
--1
--

--1
--1
--1

Manifold, Gas

1013478
1013479
1013480
1013481
1013482

1
-----

-1
----

--1
---

---1
--

----1

Bracket, Pilot

1010901

Bracket, Manifold Support

1012377

Top, Burner Box

1013705
1013015
1013016
1013859

1
----

-1
---

--1
--

---1

Bracket, Burner Box Sides

1012532

441 01 2611 06

Replacement Parts - *8MPN (Natural Gas)
Models -- *8MPN050B12A1, *8MPN075B12A1, *8MPN075F16A1, *8MPN100F14A1, *8MPN100F20A1, *8MPN100J20A1,
*8MPN125J20A1, *8MPN150J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPN
050B
12A1

075B
12A1

075F
16A1

100F
14A1

100F
20A1

100J
20A1

*125J
20A1

150J
20A1

Top, Burner Box

1013705
1013015
1013016
1013859

1
----

-1
---

--1
--

---1

Bracket, Burner Box Sides

1012532

Baffle, Burner Box

1012338
1012339
1012340
1013533

1
----

-1
---

--1
--

---1

Bottom, Burner Box

1012334
1012335
1012336
1013691

1
----

-1
---

--1
--

---1

Collector Box

1014510
1014511
1014509
1014512
1013486

1
-----

-1
----

--1
---

---1
--

----1

RTV, Collector Box

Gasket, Combustion Blower

1013540

Partition, Front Ht Exchanger

1013543
1013521
1013545
1013546
1013547
1013548
1013549

1
-------

-1
------

--1
-----

---1
----

----1
---

-----1
--

------1

Gaskets, Heat Exchanger

1013991
1013992
1013993
1013994
1012546

2
-----

-2
----

--2
---

---2
--

----2

Tubing, Silicone

1014520
1014521

1
--

-1

)(

PART NOT ILLUSTRATED

)(

Fuse, 5 Amp

1083348

)(

Harness, Wire

1013693

)(

Door Screw

1014488

)(

Door Screw Grommet

1171990

)(

Manual, Installation & Tech

44101261105

)(

Manual, Users

44102201004

441 01 2611 06

Replacement Parts - *8MPL (Natural Gas)
Models -- *8MPL050B12A1, *8MPL075B12A1, *8MPL075F16A1, *8MPL100F20A1, *8MPL100J20A1, *8MPL125J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPL
050B
12A1

075B
12A1

075F
16A1

100F
20A1

100J
20A1

125J
20A1

Heat Exchanger

1014316
1014317
1014318
1014319
1014320
1014321

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Switch, Pressure

1013529

Wheel, Blower

1013011
1011420

1
--

-1

Mount, Motor kit*

1014824
1014823
1014822

1
---

--1

-1
--

Motor, Blower

1172490
1172487
1172488

1
---

-1
--

1
---

--1

Capacitor

1014397
1014395

1
--

-1

Transformer

1012722

Control, Fan Timer

1014460

Switch, Interlock

1012351

Burner Assembly

1008723
1008724
1008725
1008726

1
----

-1
---

--1
--

---1

Pilot/Igniter

1008731

Ignitor/Sensor with Clip

1009524

Orifice, Pilot .018

503211

Orifice, Burner # 42

1011351

Valve, Gas

1013350

Switch, Limit (Rollout)

1013102

Switch, Limit (Main)

1008417
1320362
1065294

1
---

-1
--

1
---

-1
--

--1

Blower, Combustion

1014433
1013517

1
--

-1

1/115 1/2 CCW
1/115 1/2 CCW
1/115 1/2 CCW

*See Table below for bellyband location on motor
Bellyband Location
on Motor
Model *8MPL

“A(in.)”

050B12A1

1.38²

075B12A1

1.38²

075F16A1

1.38²

100F20A1

1.81²

100J20A1

1.81²

125J20A1

1.81²
A

441 01 2611 06

Replacement Parts - *8MPL (Natural Gas)
Models -- *8MPL050B12A1, *8MPL075B12A1, *8MPL075F16A1, *8MPL100F20A1, *8MPL100J20A1, *8MPL125J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPL
050B
12A1

*075B
12A1

075F
16A1

100F
20A1

100J
20A1

125J
20A1

Panel, Top

1013982
1013983
1013984

1
---

-1
--

--1

Box, Junction

1012349

Cover, Junction box

1012350

Partition, Blower

1014009
1014010
1014011

1
---

-1
--

--1

Housing, Blower

1012972
1012888

1
--

-1

Hanger, Blower

Panel, Blower Cutoff

1012328

721020013
721020008

1
--

-1

Clamp, Capacitor

1170643
1014315

1
--

-1

Bracket, Control Mounting

1013677

Tube, Pilot

1013596
1013597
1013598

1
---

-1
--

--1

Door, Blower

1014001
1014375
1014376
1014079
1014349
1014352
1014058
1014068
1014073

1
--1
--1
---

-1
--1
--1
--

--1
--1
--1

Bracket, Door

1014271
1014272
1014273

1
---

-1
--

--1

Door, Louver

1014088
1014091
1014094
1014078
1014081
1014085
1014057
1014067
1014072

1
--1
--1
---

-1
--1
--1
--

--1
--1
--1

Manifold, Gas

1013478
1013479
1013480
1013481

1
----

-1
---

--1
--

---1

Bracket, Pilot

1010901

Bracket, Manifold Support

1012377

Top, Burner Box

1013705
1013015
1013016

1
---

-1
--

--1

Bracket, Burner Box Sides

1012532

Baffle, Burner Box

1012338
1012339
1012340

1
---

-1
--

--1

Bottom, Burner Box

1012334
1012335
1012336

1
---

-1
--

--1

(Heil/Arco)
(Heil/Arco)
(Heil/Arco)
(Comfortmaker Only)
(Comfortmaker Only)
(Comfortmaker Only)
(Tempstar Only)
(Tempstar Only)
(Tempstar Only)

441 01 2611 06

Replacement Parts - *8MPL (Natural Gas)
Models -- *8MPL050B12A1, *8MPL075B12A1, *8MPL075F16A1, *8MPL100F20A1, *8MPL100J20A1, *8MPL125J20A1

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Functional

Part
Number

*8MPL
050B
12A1

*075B
12A1

075F
16A1

100F
20A1

100J
20A1

125J
20A1

Collector Box

1014510
1014511
1014509
1014512

1
----

-1
---

--1
--

---1

Gasket, Combustion Blower

1013540

Partition, Front Ht Exchanger

1013543
1013521
1013545
1013546
1013547
1013548

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Gaskets, Heat Exchanger

1013991
1013992
1013993
1013994

2
----

-2
---

--2
--

---2

Tubing, Silicone

1014519

Baffle, Nox

1014019

)(

PART NOT ILLUSTRATED

)(

Fuse, 5 Amp

1083348

)(

Harness, Wire

1013693

)(

Door Screw

1014488

)(

Door Screw Grommet

1171990

)(

Manual, Installation & Tech

44101261105

)(

Manual, Users

44102201004

441 01 2611 06

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : No
Create Date                     : 2004:10:21 07:48:38
Producer                        : Acrobat Distiller 4.05 for Windows
Modify Date                     : 2004:11:02 09:37:27-06:00
Page Count                      : 57

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