International comfort products N8MPL050B12, N8MPL075B12, N8MPL075F16, N8MPL100F20, N8MPL100J22 Installation Instructions Manual

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CARBON MONOXIDE POISONING AND FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

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

ELECTRIC SHOCK HAZARD Failure to follow this warning

could result in injury and/or death.

Turn OFF all power, lockout and tag with suitable warning label before servicing.

International Comfort Products, LLC

Lewisburg, TN 37091 U.S.A.

See section 5 for Category I definition.

INSTALLER: Affix these instructions on or adjacent to the furnace.

CONSUMER: Retain these instructions for future reference.

Portions of the text and tables are reprinted from ANSI Z223.1/NFPA 54!2009, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Wash- ington, 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.

WARNING

* Denotes Brands (C, H, T)

Printed in U.S.A. 441 01 2613 05 Sept. 2009

80+ SINGLE STAGE GAS FURNACE

Category I Furnace

N8MPN/N8MPL & *8MPN/*8MPL

Upflow/Downflow/Horizontal

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory!authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas Code (NFCG) NFPA 54/ANSI Z223.1, National Electrical Code (NEC) NFPA 70.

In Canada refer to the current editions of the National standards of Canada CAN/CSA!B149.1 and .2 Natural Gas and Propane Installation Codes, and Canadian Electrical Code CSA C22.1.

Recognize safety information. This is the safety!alert symbol

. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety!alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

Table of Contents

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

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

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

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

5. Gas Vent Installation 12. . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

9. Electrical Wiring 21. . . . . . . . . . . . . . . . . . . . . . . . . . .

10.Ductwork and Filter (Upflow/Horizontal) 22. . . . . . . .

11.Ductwork and Filter (Downflow) 25. . . . . . . . . . . . . . . .

12. Checks and Adjustments 27. . . . . . . . . . . . . . . . . . . . . .

13. Furnace Maintenance 32. . . . . . . . . . . . . . . . . . . . . . . .

14. Sequence of Operation & Diagnostics 33. . . . . . . . . . . .

15.Technical Support Manual 35. . . . . . . . . . . . . . . . . . . . .

16.Model Specificications 36. . . . . . . . . . . . . . . . . . . . . . . .

17.Circulation Data & Bellyband Placement 31. . . . . . . . . .

18.Wiring Diagram 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19.Parts Information Guide 43. . . . . . . . . . . . . . . . . . . . . .

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441 01 2613 05

Specifications are subject to change without notice

START!UP CHECK SHEET

For 80+ Furnace

(This sheet is optional. Keep this page for future reference.)

Date of Start!Up:

Dealer Name:

Address:

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

Phone:

Owner Name:

Address:

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

Model Number:

Serial Number:

Setup Checks

Check the box when task is complete

Thermostat: Heat

Cooling Fan

Subbase level:

Anticipator Set: Setting of Anticipator ____

All Electrical Connections Tight:

Supply voltage: ____

Blower Motor H.P.: ____

Fan “Time ON” setting: ____ Fan “Time OFF” Setting ___

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

Gas Valve turned ON?

Type of Gas: Natural: Propane:

Filter Type and Size:

Calculated Firing Rate:(See Checks and Adjustments

Section).

Heating Check

Measured Line Pressure when Firing Unit:

Measured Manifold Gas Pressure:

Temperature of Supply Air: (°)

Temperature of Return Air: (°)

Temperature Rise (supply!return temperature): (°)

In Rise (see furnace rating plate)? (°)

Static Pressure (Ducts): Supply Air Return

Blower speed tap used for heating

Limit Opens: (°) Limit Closes: (°)

Optional Check: CO ? CO2 ?

Cooling Check

Temperature of Supply Air: (°)

Temperature of Return Air: (°)

Temperature Difference: (°)

Static Pressure (Ducts) cooling: Supply Air Return

Blower Speed Tap used for cooling: _______

Dealer Comments:

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441 01 2613 05

Specifications are subject to change without notice

1. Safe Installation Requirements

FIRE, EXPLOSION, AND ASPHIXIATION HAZARD

Improper adjustment, alteration, service, maintance or installation could cause personal 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.

WARNING

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 Propane gas with approved kit.)

• Install this furnace only in a location and position as

specified in “Installation” of these instructions.

• Provide adequate combustion and ventilation air to the

furnace as specified in “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 “Gas Vent Installation, Horizontal Venting and 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 “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. See furnace rating plate.

• 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 “Installation” of these instructions.

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

buildings or structures under construction.

• 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.

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

WATER DAMAGE TO PROPERTY HAZARD

FaiIure to follow this warning could result in property damage.

Do not leave your home unattended for long periods during freezing weather without turning off water supply and draining water pipes or otherwise protecting against the risk of frozen pipes and resultant damage.

WARNING

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441 01 2613 05

Specifications are subject to change without notice

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!

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

!or!

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

2. Installation

CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in

personal injury or death. If this furnace is replacing a previously common-

vented furnace, it may be necessary to resize the existing vent system to prevent oversizing problems for the other remaining appliances(s). See Venting and Combustion Air Check in the Gas Vent Installation section of this instruction.

WARNING

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).

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

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 Combustion & Ventilation Air section, Contaminated Combustion Air for combustion air evaluation and remedy.

WARNING

Installation Requirements

1. Install furnace level.

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

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

4. Install the vent pipes as short as practical. (See 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 24″ (609.6mm) required and 30″ (762mm) is

recommended for access to the burner, controls and filter. See clearance requirements in Figure 1 or Figure 2.

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

8. Residential garage installations require:

• Burners and ignition sources installed at least 18″

(457.2mm) 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.

• 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 filters used to clean the circulating air during the

construction process must be either changed or thoroughly cleaned prior to occupancy.

• 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.

• Verify proper furnace operating conditions including

ignition, gas input rate, air temperature rise, and venting according to these installation instructions.

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

Drawing is representative, but some models may vary

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

Unit is designed for bottom return or side return.

Return air through back of unit is NOT allowed.

131/

281/

33/

171/

21/

TOP

51/

31/

LEFT SIDE

61/

33/

271/

131/

241/

17/

213/

265/

131/

47/

11/

RIGHT SIDE

281/

181/

21/

131/

171/

213/

11/

253/

47/

265/

17/

FRONT

30″ Min.

BOTTOM

231/

41/

J H

Plugged starting hole to cut side duct opening

ALL DIMENSIONS in(mm)

1 in = 25.4 mm

(724)

(470)

(19)

(57)

(337)

(178)

(470)

(676)

(124)

(48)

(889)

(95)

(51)

(813)

(654)

(337)

(440)

(38)

(95)

(127)

(178)

(124)

(48)

(337)

(838)

(670)

(622)

(337)

(440)

(38)

(552)

(57)

(762)

(587)

(103)

(83)

(25)

(552)

(165)

(676)

(135)

441 01 2613 05

Specifications are subject to change without notice

Figure 1 Dimensions and Clearances N8MPN/L

MINIMUM CLEARANCES TO

COMBUSTIBLE MATERIALS FOR ALL UNITS

REAR 0 FRONT (combustion air openings

in furnace and in structure)

3″ (76 mm)

Required For Service

*30″ (762 mm)

ALL SIDES Of SUPPLY PLENUM 1″ (25 mm) SIDES 0 VENT

Single Wall Vent 6″ (152 mm) Type B!1 Double Wall Vent 1″ (25 mm)

TOP OF FURNACE 1″ (25 mm)

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.

DIMENSIONAL INFORMATION

Unit

Capacity

Cabinet Bottom

Duct

Size

A B C D

N8MPL050B12 N8MPL075B12

151/

(76)

(356)

13/

(1.4)

125/

(321)

N8MPL075F16 N8MPL100F20

191/

(486)

175/

(447)

21/

(54)

143/

(15)

N8MPL100J22 N8MPL125J20 N8MPL125J22

223/

(578)

211/

(540)

115/

(49)

183/

(476)

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Subject to change without notice.

331/

303/

291/

175/

33/

21/

13/

47/

21/

47/

271/

175/

321/

277/

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

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

ALL DIMENSIONS - in(mm) 1 in = 25.4 mm

231/

41/

24″ (610) min.

51/

TOP

111/

265/

131/

217/

17/

33/

LEFT SIDE

FRONT

BOTTOM

RIGHT SIDE

181/

281/

131/

261/

215/

17/

Plugged starting hole to cut side duct opening..

Drawing is representative, but some models may vary

(135)

(127)

(95)

(365)

(826)

(708)

(699)

(440)

(43)

(124)

(556)

(676)

(587)

(48)

(337)

(57)

(178)

(103)

(25)

(57)

(470)

(724)

(19)

(51)

(95)

(178)

(25)

(940)

(781)

(851)

(749)

(440)

(45)

(124)

(542)

(673)

(337)

(48)

(1016)

441 01 2613 05

Specifications are subject to change without notice

Figure 2 Dimensions and Clearances *8MPN/L Models

MINIMUM CLEARANCES TO

COMBUSTIBLE MATERIALS FOR ALL UNITS

REAR 0

FRONT (combustion air openings in furnace and in structure)

3″ (76 mm)

Required For Service

*24″ (610 mm)

ALL SIDES Of SUPPLY PLENUM 1″ (25 mm)

SIDES 0

VENT

Single Wall Vent 6″ (152 mm)

Type B!1 Double Wall Vent 1″ (25 mm)

TOP OF FURNACE 1″ (25 mm)

*30″ (762 mm) clearance recommended for furnace removal.

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.

Furnace

Capacity

Cabinet Top Bottom

Return

Air

Opening

A B F C D

*8MPL050B12 *8MPL075B12

151/

(394)

(356)6(152)

13/

(35)

125/

(321)

*8MPL075F16 *8MPL100F20

191/

(486)

171/

(445)

73/

(197)

21/

(54)

143/

(375)

*8MPL100J22 *8MPL125J20

223/

(578)

211/

(540)

91/

(241)

115/

(49)

183/

(476)

* Denotes Brand (C, H, T)

Installation Positions

This furnace can be installed in an upflow, horizontal (either left or right) or downflow airflow position. DO NOT install this furnace on its back. For the upflow position, the return air ductwork can be attached to either the left or right side panel and/or the bottom. For horizontal and downflow positions, the return air ductwork must be attached to the bottom. The return air ductwork must never be attached to the back of the furnace.

Furnace Installation

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

* Dentoes Brand (C, H, T)

Upflow

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

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441 01 2613 05

Specifications are subject to change without notice

Typical Upflow Installation

Figure 3

25!23!17

VENT

SUPPLY

AIR

GAS SUPPLY

RETURN

AIR

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.

Typical Horizontal Installation

Figure 4

VENT

GAS SUPPLY

SUPPLY

AIR

RETURN

AIR

25-23-18a

OPTIONAL VENT LOCATION

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 1″ to 2″ (25.4 to 50.8mm) thick is recommended.

24″ (609.6mm) 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.

The horizontal furnaces may be installed directly on combustible wood flooring or supports, however, it is recommended for further fire protection cement board or sheet metal is placed between the furnace and the combustible wood floor and extend 12″ (304.8mm) beyond the front of the furnace louver door. (This is a recommendation only, not a requirement).

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

Downflow

FIRE HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

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

WARNING

If you purchased a Multi!position furnace (N8MP or *8MP) it may be installed in a downflow configuration, (see Figure 5). The minimum clearances to combustible material 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 “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.

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

4. Remove two thumbscrews from blower compartment door .

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

6. Install new strip of rubber gasket on inside of blower 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.

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

N8MPN/L, C8MPN/L, H8MPN/L

1. Carefully remove logo from burner compartment door and save it.

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Specifications are subject to change without notice

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.

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.

BURN HAZARD

Failure to follow this warning could result in personal injury and/or property damage.

Vent pipe is HOT and could cause personal injury. Hot vent pipe is in reach of small children when installed in downflow position.

Install vent pipe shield NAHA002VC.

WARNING

Pressure Switch Relocation

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 relocate 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.

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.

See side venting for venter rotation

Typical Downflow Installation

Figure 5

VENT

GAS SUPPLY MUST BE OPPOSITE VENT DISCHARGE SIDE

SUPPLY

AIR

RETURN

AIR

OPTIONAL VENT

25!23!19

Combustible floor base outlet flange adapter

Vent Shield Kit

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 configuration for use in upflow, horizontal!flow, or downflow application.

When using a side vent configuration (side outlet instead of top outlet), it may be necessary to relocate the pressure switch to the alternate position on the opposite side of the top panel. Two screw holes are provided at the alternate position. Route the pressure switch tubing so the tubing is not kinked and not touching the hot collector box, venter housing, or motor. It may be necessary to shorten the length of the tubing to properly route the tubing and eliminate kinks.

Rotating the Venter Assembly

1. 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).

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).

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

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

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

Figure 6

25!23!45

Screws (2)

Furnace with Screws

Vent Plate

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Figure 7

Venter Gasket

25-23-52b

Entry

25-23-52c

Main Line

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

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

NOTE: Unused open vent hole must be covered. A Vent Cover is supplied with Vent Pipe Shield Kit NAHA002VC. A 5

/16″ (135mm) diameter Vent Cover is available separately from your distributor, or one can be fabricated with sheet metal for all side vent installations.

4. Combustion & Ventilation Air

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

Use methods described here to provide combustion and ventilation air.

WARNING

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:

Note: The Combustion & Ventilation Air Section, in this document,

uses tables and information from the ANSI Z223.1/NFPA 54!2009. For use in Canada, use CSA B149.1 for this information.

1. Section 9.3, Air for Combustion and Ventilation, of the National Fuel Gas Code, (NFGC), ANSI Z223.1/NFPA 54!2009 in the U.S.,

2. Sections 8.2, 8.3, 8.5, 8.6, 8.7, and 8.8 of National Standard of Canada, Natural Gas and Propane Installation Code (NSCNGPIC), CSA B149.1!05 in Canada,

3. Applicable provisions of the local building code.

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

Contaminated Combustion Air

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

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

• Commercial buildings.

• Buildings with indoor pools.

• Furnaces installed in laundry rooms.

• Furnaces installed in hobby or craft rooms.

• Furnaces installed near chemical storage areas.

• Permanent wave solutions for hair.

• Chlorinated waxes and cleaners.

• Chlorine based swimming pool chemicals.

• Water softening chemicals.

• De!icing salts or chemicals.

• Carbon tetrachloride.

• 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 (4.8 cubic meters per kW) input rating for all gas appliances installed in the space requires outdoor air for combustion and ventilation.

Air Openings and Connecting Ducts

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

2. Connect ducts or openings directly to the outdoors.

3. When screens are used to cover openings, the openings MUST be no smaller than

/4″ (6.4mm) mesh.

4. The minimum dimension of air ducts MUST NOT be less than 3″(76.2mm).

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

/4″(6.4mm).

Requirements

1. Provide the space with sufficient air for proper combustion and ventilation of flue gases using horizontal or vertical ducts or openings.

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

a. One opening MUST commence within 12″ (304.8mm) of

the floor and the second opening MUST commence within 12″ (304.8mm) of the ceiling.

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

area per 2,000 BTUH (11 cm

/kW) of combined input for

all gas appliances in the space (see Table 1).

d. Vertical duct openings or openings directly

communicating with the outdoors require 1 square inch of free area per 4,000 BTUH (5.5 cm

/kW) for combined

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

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

a. 1 sq. in of free area per 3,000 BTUH (7 cm

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

b. Not less than the sum of the areas of all vent connectors

in the space.

Figure 8

Furnace

Minimum One Inlet and One Outlet Air Supply is Required

May be in and Combination Shown

Inlet Air Opening Must be Within12″(304.8 mm) of floor

Outlet Air Opening Must be Within12″(304.8 mm) of ceiling

(1) 1 Square Inch per 4000 BTUH

(2) 1 Square Inch per 2000 BTUH

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

This installation NOT approved in Canada

Gas Vent

Gable Vent

Outlet Air (1)

Furnace

Outlet Air (2)

Optional Inlet Air (1)

Ventilated Attic

Ventilated Crawl Space

Inlet Air (1)

Inlet Air (2)

Top Above Insulation

Soffit Vent

The opening shall commence within 12″ (304.8mm) of the top of the enclosure. Appliances shall have clearances of at least 1″ (25.4mm) from the sides and back and 6″ (152.4mm) from the front. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

4. Combination of Indoor and Outdoor Air shall have:

a. Indoor openings that comply with the Indoor

Combustion Air Method below and

b. Outdoor openings located as required in the Outdoor

Combustion Air Method above and

c. 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.

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

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

Table 1

Free Area

BTUH (kW)

Input

Rating

Minimum Free Area Required for Each Opening or Duct to Outdoors

Two Horizontal Ducts

BTUH (kW)

sq. in./2,000(1 cm

/.09)

Single Opening

BTUH (kW)

sq. in./3,000 (1 cm

/.135)

Two Vertical Ducts or Openings

BTUH (kW)

sq. in./4,000(1 cm

/.18)

Round Duct

BTUH (kW)

sq. in./4,000(6.5cm

/.18)

50,000 (14.65) 25 sq. in. (161 cm2) 16.7 sq. in. (108 cm2) 12.5 sq. in. (81 cm2) 4″ (101.6mm)

75,000 (21.98) 37.5 sq. in. (242 cm2) 25 sq. in. (161 cm2) 18.75 sq. in. (121 cm2) 5″ (127mm)

100,000 (29.31) 50 sq. in. (322 cm2) 33.3 sq. in. (215 cm2) 25 sq. in. (161 cm2) 6″ (152.4mm)

125,000 (36.63) 62.50 sq. in. (403 cm2) 41.7 sq. in. (269 cm2) 31.25 sq. in. (202 cm2) 7″ (177.8mm)

150,000 (43.95) 75 sq. in. (484 cm2) 50 sq. in. (322 cm2) 37.5 sq. in. (242 cm2) 7″ (177.8mm)

EXAMPLE: Determining Free Area

Furnace 100,000

29.31 Furnace 100,000

29.31

Water Heater

30,000

8.8

Water Heater

30,000

8.8

Total Input

(130,000 ÷ 4,000)

(38.11 ÷ .18)

Total Input

(130,000 ÷ 2,000)

(38.11 ÷ .09)

= 32.5 Sq. In. Vertical = 210 c

Vertical

= 65 Sq. In. Horizontal = 423

Horizontal

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Indoor Combustion Air

Standard and Known-Air-Infiltration Rate Methods

 NFPA & AGA

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

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

Most homes will require additional air from outdoors for combustion and ventilation. A space with at least 50 cubic feet per 1,000 BTUH (1.4 cubic meters per .293 kW/h) input rating or homes with tight construction may need outdoor air to supplement air infiltration for proper combustion and ventilation of flue gases.

WARNING

The Standard Method may be used, if the space has no less volume than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW) 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.

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.

Table 2

MINIMUM SPACE VOLUME FOR 100% COMBUSTION AND VENTILATION AIR FROM INDOORS

Other Than Fan-Assisted Total Fan-assisted Total

ACH

30,000 BTU

(8.79 kW)

40,000 BTU

(11.72 kW)

50,000 BTU

(14.65 kW)

50,000 BTU

(14.65 kW)

75,000

(21.98 kW)

100,000 BTU

(29.30 kW)

125,000 BTU

(36.63 kW)

150,000 BTU

(43.95 kW)

(m3)

0.60 1,050 (29.7) 1,400 (39.2) 1,750 (49) 1,250 (35) 1,875 (52.5) 2,500 (70) 3,125 (87.5) 3,750 (105)

0.50 1,260 (35.3) 1,680 (47.04) 2,100 (58.8) 1,500 (42) 2,250 (63) 3,000 (84) 3,750 (105) 4,500 (126)

0.40 1,575 (44.1) 2,100 (58.8) 2,625 (73.5) 1,875 (52.5) 2,813 (78.8) 3,750 (105) 4,688 (131.3) 5,625 (158)

0.30 2,100 (58.8) 2,800 (78.4) 3,500 (98) 2,500 (70) 3,750 (105) 5,000 (140) 6,250 (175) 7,500 (210.6)

0.20 3,150 (88.2) 4,200 (117.6) 5,250 (147) 3,750 (105) 5,625 (157.5) 7,500 (210) 9,375 (262.5) 11,250 (316)

0.10 6,300 (176.4) 8,400 (235.2) 10,500 (294) 7,500 (210) 11,250 (315) 15,000 (420) 18,750 (525) 22,500 (632)

0.00 NP NP NP NP NP NP NP NP

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

following equations from the National Fuel Gas Code ANSI Z223.1/NFPA 54!2009, 9.3.2.2:

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

1000 Btu / hr

21 ft

(

other

)

Volume

other

ACH

.293 kW / hr

59 m

(

other

)

Required Volume

other

ACH

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

1000 Btu / hr

15 ft

(

fan

)

Volume

fan

ACH

.293 kW / hr

.42 m

(

fan

)

Required Volume

fan

ACH

If:

other

= combined input of all other than fan!assisted

appliances in Btu/hr

fan

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

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

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

• Adjoining rooms can be considered part of a space, if there

are no closable doors between rooms.

• An attic or crawl space may be considered a space that freely

communicates with the outdoors provided there are adequate ventilation openings directly to outdoors. Openings MUST remain open and NOT have any means of being closed off. Ventilation openings to outdoors MUST be at least 1 square inch of free area per 4,000 BTUH (5.5 cm

/kW) 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:

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

2. Doors and openable windows are weather stripped and

3. Other openings are caulked or sealed. These include joints around window and door frames, between sole plates and floors, between wall!ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines, etc.

Ventilation Air

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

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replacement air. Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60° F(16° C) continuously, or 55° F(13° C) 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

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Read and follow all instructions in this section.

WARNING

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.

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 12 and 13 of the National Fuel Gas Code (NFGC), ANSI Z223.1/NFPA 54!2009; and/or Section 8 and Appendix C of the CSA B149.1!05, 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!2009 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 ANSI Z223.1/ NFPA

54!2009 Sections 12 and 13 venting requirements in the United States

• the National Standard of Canada Natural Gas and

Propane Installation Code (NSCNGPIC) CSA

B149.1!05 Section 8 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

/8″

(15.9mm) 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

/4″ per foot (10mm/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.

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.

Vent Check

Draft HoodVent Pipe

Match

Typical Gas Water Heater

Figure 9

NOTE: If flame pulls towards draft hood, this indicates

sufficient infiltration air.

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CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation, could result in carbon monoxide poisoning or death:

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1.Seal any unused openings in the venting system.

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

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

mine that there is no blockage or restriction, leakage, 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.

4.Close fireplace dampers.

5.Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.

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

7.Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle. (Figure 9)

8.If improper venting is observed, during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.

9.After it has been determined that each appliance 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.

WARNING

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 ANSIZ223.1/NFPA!2009 tables 13.1a or 13.1b or a listed metal lining system. (See Masonry Chimney Venting of these instructions.)

Listed, corrugated metallic chimney liner systems in masonry chimneys shall be sized by using ANSIZ223.1/NFPA!2009 section 13.1.7 for dedicated venting and 13.2.20 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 CSA B149.1!05 Natural Gas and Propane Installation Code, 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.

Combined Venting into a Masonry Chimney

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

all safe venting requirements.

Note: See section “Masonry Chimney Venting”.

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 power venter 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.

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Other than Direct Vent Termination Clearance

Figure 10

A05013

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7. Masonry Chimney Venting

Chimney Inspection

All masonry chimney construction must conform to Standard ANSI/NFPA 211!2006 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(!8°C) 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 2005 ASHRAE Fundamentals Handbook CD and Chapter 28.

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, 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.

WARNING

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!2006 in the United States and to a Provincial or Territorial Building Code in Canada (in its absence, the National Building Code of Canada) and must be in good condition.

U.S.A.!Refer to Sections 13.1.9 or 13.2.22 of the ANSI Z223.1/NFPA 54!2009 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 ANSI Z223.1/NFPA 54!2009, 13.1.9 and 13.2.22 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

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

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

4. The input rating of each space!heating appliance is greater than the minimum input rating given in Table B for Masonry Chimneys for the local 99% Winter Design Temperature. Chimneys having internal areas greater than 38 square inches (245 sq. cm) require furnace input ratings greater than the input ratings of these furnaces. See footnote at bottom of Table B, and

5. The authority having jurisdiction approves.

If all of these conditions cannot be met, an alternative venting 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.

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Chimney is

acceptable for use

Crown

condition:

Missing mortar

or brick?

Rebuild

crown

Chimney properly lined

with clay tile

liner?

Yes

Is liner and top seal in good

condition

Debris in

cleanout? Mortar, tile,

metal vent, fuel oil

residue?

Repair

liner or top seal

or reline chimney as

necessary.

Reline

Yes Repair

Yes

Clay tile misalignment, missing sections,

gaps?

Is Chimney

lined with properly

sized, listed liner or

Type-B vent?

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.

CHIMNEY INSPECTION CHART

For additional requirements refer to the National Fuel Gas Code ANSI Z223.1/NFPA 54-2009 and ANSI/NFPA 211-2006 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances in the U.S.A. or to the Canadian Installation Code CSA B149.1-05 in Canada.

Yes

Mortar or

tile debris?

Yes

Remove mortar

and tile debris?

Remove metal vent or liner.

Consult

Part B of chimney

adapter venting

instructions for

application

suitability.

Chimney

exposed to outdoors

below roof line?

Is Chimney to

be dedicated to a

single furnace?

Yes

Install chimney

adapter per instructions.

Not Suitable

Suitable

Consult

Part C of chimney

adapter venting

instructions for

application

suitability.

Suitable

Install chimney

adapter per instructions.

Condensate

drainage at bottom

of chimney?

Yes

Figure 11

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Exterior Masonry Chimney, FAN+NAT Installations with

Type!B Double!Wall Vent Connectors

! NFPA & AGA

Table A-

Combined Appliance Maximum Input Rating in Thousands of Btu per Hr

VENT

HEIGHT

FT(m)

INTERNAL AREA OF CHIMNEY

SQ IN.(cm)

12(77.4) 19(122.6) 28(180.6) 38(245.2)

6(1.8) 74 119 178 257 8(2.4) 80 130 193 279

10(3) 84 138 207 299 15(4.6) NR 152 233 334 20(6.1) NR NR 250 368 30(9.1) NR NR NR 404

Table B-

Minimum Allowable Input Rating of

Space-Heating Appliance in

Thousands of Btu per Hr

VENT

HEIGHT

FT(m)

INTERNAL AREA OF CHIMNEY

sq. in(cm)

12(77.4) 19(122.6) 28(180.6) 38(245.2)

17 to 26"F (!8 to !3"C)

Local 99% Winter Design Temperature:

17 to 26°F (!8 to !3°C)*

6(1.8) 0 55 99 141 8(2.4) 52 74 111 154

10(3) NR 90 125 169

15(4.6) NR NR 167 212

20(6.11) NR NR 212 258

30(9.1) NR NR NR 362

5 t o 16"F (!15 to !9"C)

Local 99% Winter Design Temperature:

5 to 16°F (!15 to !9°C)*

6(1.8) NR 78 121 166

8(2.4) NR 94 135 182

10(3) NR 111 149 198

15(4.6) NR NR 193 247

20(6.11) NR NR NR 293

30(9.1) NR NR NR 377

!10 to 4"F (!23 to !16"C)

Local 99% Winter Design Temperature:

!10 to 4°F (!23 to !16°C)*

6(1.8) NR NR 145 196

8(2.4) NR NR 159 213

10(3) NR NR 175 231

15(4.6) NR NR NR 283

20(6.11) NR NR NR 333

30(9.1) NR NR NR NR

!11 °F

(!24°C)

or lower

Local 99% Winter Design Temperature:

!11°F (!24°C) or lower*

Not recommended for any vent configuration

* The 99% Winter Design Dry!Bulb (db) temperatures are

found in the 2005 ASHRAE Fundamentals Handbook CD

and Chapter 28. 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.

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

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

be relined in accordance with local codes and the authority having jurisdiction. The chimney should be relined with a listed metal liner, Type!B vent, or a listed chimney adapter kit to reduce condensation. If a condensate drain is required by local code, refer to the ANSI Z223.1/NFPA 54!2009, Section 12.10 for additional information on condensate drains.

b. Indicates the chimney exceeds the maximum permissible

size in the tables, the chimney should be rebuilt or relined to conform to the requirements of the equipment being

installed and the authority having jurisdiction. A chimney without a clay tile liner, which is otherwise in good condition, shall be rebuilt to conform to ANSI/NFPA 211!2006 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 APPLICATION REQUIREMENTS

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. The return!air temperature must be at least 60°F(16°C) db

except for brief periods of time during warm!up from

setback at no lower than 55°F(13°C) db or during initial

start!up from a standby condition.

2. Adjust the gas input rate per the installation instructions. Low gas input rate causes low vent gas temperatures, causing condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above 2000′ (610m).

3. 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.

4. 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.

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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

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal 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 Propane gas.

WARNING

Gas Supply Requirements

• 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 6 and Table 7 for manifold pressures.

Table 3 Gas Pressures

Gas Type

Supply Pressure

Recommended Max. Min.

Natural 7 in wc

(1744 Pa)

14 in wc

(3487 Pa)

4.5 in wc 1121 Pa)

Propane 11 in wc

(2740 Pa)

14 in wc

(3487 Pa)

11 in wc

(2740 Pa)

Gas Piping Requirements

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

NOTE: In the state of Massachusetts.

a. Gas supply connections MUST be performed by a

licensed plumber or gas fitter.

b. When flexible connectors are used, the maximum length

shall not exceed 36″ (914.4mm).

c. When lever handle type manual equipment shutoff

valves are used, they shall be T!handle valves.

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

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

2. 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.

FIRE HAZARD

Failure to follow this warning could result in personal injury or death.

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

WARNING

Use elbows and 3# (76.2mm) pipe nipple to con nect valve to piping when using right side gas pipe entry.

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

Drip Leg and Union, Union* should be outside the cabinet. Manual shut-off valve MUST be upstream of dripleg, union, and furnace.

Propane Low pressure switch.

25!24!86

3# (76.2mm) pipe nipple

Manual shut-off valve

Typical Gas Piping (N8MP)

Figure 12

Representative drawing only, some models may vary in appearance.

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

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

5. Use ground joint unions and install a drip leg no less than 3″ (76.2mm) long to trap dirt and moisture before it can enter gas valve inside furnace.

6. Provide a

/8″ NPT plugged tapping for test gauge connection

immediately up stream of gas supply connection to furnace.

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

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.

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

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

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

11. Measure pipe length from gas meter or Propane second stage regulator to determine gas pipe size.

Right Side Gas Supply Piping (N8MP)

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

Left Side Gas Supply Piping (N8MP)

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

Figure 12.

Piping with Street Elbows

1. Assemble the elbows so that the outlet of one(1) elbow is 90° from the inlet of the other. The elbows should be tight enough to be leak proof. An additional

turn will be required at the

end of step 2, see Figure 13.

Figure 13

25!23!23c

Elbows (N8MP)

2. 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

/8 turn will be required in step 3. Turn open end of inlet elbow to face the left side of the furnace (

/4 turn), see Figure 14.

Figure 14

Gas Valve with Elbows (N8MP)

Representative drawing only, some models may vary in appearance.

3. Turn assembly an additional 3/8 turn to position inlet near the bottom back corner of the gas valve in line with gas opening on left side of furnace, see Figure 15.

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

Piping with Close Nipples and Standard Elbows

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

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

Figure 15

Gas Valve with Elbows (N8MP)

Representative drawing only, some models may vary in appearance.

FIRE HAZARD

Failure to follow this warning could result in personal injury, or death, and/or property damage.

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

WARNING

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)

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

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Typical Gas Piping (*8MP)

Figure 16

25-25-02

Representative drawing only, some models may vary in appearance.

Piping with Street Elbows

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

2. Screw second elbow onto first elbow tight enough to be leak proof. An additional

/4 turn will be required at the end of step

2. See Figure 17 and Figure 18.

Figure 17

Gas Valve with Elbows (*8MP)

Representative drawing only, some models may vary in appearance.

Figure 18

Gas Valve with Elbows (*8MP)

Representative drawing only, some models may vary in appearance.

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

Piping with Close Nipples and Standard Elbows

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

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

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

A flexible corrugated metal gas connector must be properly installed, shall not extend through the side of the furnace, and shall not be used inside the furnace.

Black iron pipe shall be installed at the furnace gas valve and extend a minimum of 2# (50.8mm) outside furnace.

WARNING

Additional Propane Piping Requirements

• Have a licensed Propane 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 Propane gas is recommended.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

An open flame or spark could result in death, personal injury and/or property damage.

Propane 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.

WARNING

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

/2″ psig, isolate the furnace from the gas supply piping system by closing the equipment shutoff valve.

b. If test pressure exceeds

/2″ psig, the furnace and its manual equipment shutoff valve must be disconnected from the gas supply piping system.

• Use a commercially available soap solution made specifically

for the detection of leaks to check all connections..

• Do not use an open flame to test for gas leaks. Fire or

explosion could occur.

• Correct even the smallest leak at once.

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9. Electrical Wiring

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Turn OFF electrical power at fuse box or service panel, lockout, and tag switch with a suitable warning label before making any electrical connections and ensure a proper ground connection is made before connecting line voltage.

WARNING

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!2008 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 35° C rise. Wire and circuit breaker sizing shall be based on the ampacity of the furnace electrical components plus the amps for all installed accessories (1.0 amps total for EAC and HUM). Ampacity can be determined by using the NEC or CEC.

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

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

Junction Box (J-Box) Relocation

N8MPN/L Models

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

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

2. Remove and discard two screws holding J!Box to casing.

3. Move large hole plug from right to left J!Box location.

4. Move J!Box to alternate location and attach using two self!tapping screws from bag.

5. Apply two hole plugs from bag at left J!Box location.

6. Position all wires away from sharp edges and moving parts. Do not pinch J!Box wires or other wires when reinstalling blower compartment door.

*8MPN/L Models

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

1. Remove and save two screws holding J!Box to casing.

2. Move large hole plug from right to left J!Box location.

3. Clip wire tie holding J!Box wires.

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

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

Thermostat

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

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

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

Heat anticipator setting will need to be measured if 24VAC humidifier is installed. Measure current in series from R to W at the thermostat. Be sure 24VAC humidifier is wired up to control. Allow furnace to operate for 2 minutes before recording the AC amperage reading. Set anticipator on thermostat to recorded value.

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.

REDUCED FURNACE LIFE HAZARD

Failure to follow this warning may result in reduced furnace life.

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

CAUTION

HUMIDIFIER ! The 24VAC HUM is energized when the pressure switch closes on a call for heat. The HUM (115VAC) is energized when the inducer is energized.

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

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Figure 19

Electrical Connections

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

* Permissible limits of voltage at which unit will operate satisfactorily

115V. 60Hz.

Connection Box

Ground

HOT

NEUT.

Thermostat

Low Voltage Terminal Board

Drawing is representative some models may vary in appearance.

Furnace Control

The furnace 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”.

Furnace Control Fuse

The 24V circuit contains a 5!amp, automotive!type fuse located on furnace control. (See Figure 20) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.).

Control Connections

Figure 20

FUSE

25-24-98

Diagnostic Light

Jumper

24 VAC HUM

115 VAC HUM

10. Ductwork and Filter (Upflow/Horizontal)

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

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.

WARNING

Duct Connections

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

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

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.

Cutting Side Return Air Opening

Figure 21

Knockout

Starting

Hole

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

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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).

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.

CARBON MONOXIDE POISONING HAZARD

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

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

WARNING

• 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 2″ (50.8mm) of insulation with outdoor type vapor barrier.

• Ductwork installed in an indoor unconditioned space requires

a minimum of 1″ (25.4mm) 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

A filter MUST be used.

Filters are not supplied

with these furnaces, but can be purchased

from your distributor.

See Table 4 for required high!velocity filter sizes.

Table 4

High!Velocity Air Filter Sizes

(max. 600 FPM/3.0 m/s)

Cabinet

Width

in (mm)

Internal

Filter

in(mm)

External Filter Rack

Bottom Bottom Side+

151/

(393.7)

14 X 25

(355.6 x 635)

14 X 25

(355.6 x 635)

14 X 25 (355.6 x 635)

or 16 X 25 (508 x 635)*

191/

(485.8)

16 X 25 *

(406.4 x 635) *

16 X 25

(406.4 x 635)*

16 X 25

(406.4 x 635)*

223/

(577.9)

20 X 25

(508 x 635)*

20 X 25

(508 x 635)*

16 X 25

(508 x 635)*

* Greater than 1600 CFM with a maximum of 2000 CFM requires both (left and right) side return filter racks or for single return in an upflow application, must use filter rack NAHA001TK.

See Figure 22.

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

Use either filter type:

• Washable, high!velocity filters are based on a maximum air

flow rating of 600 FPM (3.0 m/s).

• Disposable, low velocity filters are based on a maximum air

flow of 300 FPM (1.5 m/s) when used with external filter grille.

RISK OF REDUCED FURNACE LIFE

Failure to follow this 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.

CAUTION

• The furnaces with 1600 (755 L/s) or less CFM rating use a

16” x 25” (406.4 x 635mm) high!velocity filter and rack. 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 1600 CFM to 2000 CFM (755 L/s to 944

L/s) may require that both (left and right) side returns are used or for single side return in upflow application, must use filter rack NAHA001TK. Filter racks must be mounted externally. See Figure 24.

• If return air must be on one side only, an optional 20″ x 25″

(508 x 635mm) 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.

• See Circulator Air Blower Data for additional data.

NOTE: The 20″ x 25″ (508 x 635mm) standoff side filter rack gives more filter area but does not provide more air. See Figure 22. To achieve 2000 CFM (944 L/s), two side returns may be required. See Figure 24.

NOTE: Disposable low!velocity filters may be replaced with washable, high!velocity filters. Washable, high!velocity filters can be replaced ONLY with same type and size filter unless

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

Figure 22

Optional Duct Standoff ! NAHA001TK

in(mm)

Filter

20 x 25 (508 x 635 mm) Optional Filter Rack

16 (406)

14.5 (368)

25 1/16 (637)

1/16

(637)

7/8

(175)

1/2

(570)

1/2

(470)

22 1/2 (572)

20 (508)

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.

Figure 23 Side Return Filter Rack

Filter

25-23-05-4a

25-23-05-3

Filter

Using Two Filter Racks

Figure 24

Filters Installed on Two Sides

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.

Center Clip side-to-side

Figure 25 Bottom Mounted Filter

25-24-18-1

9″

Figure 26 Filter Clip Construction ! in(mm)

26 Ga. Galvanized Steel FAST part number 1008482

3″

11/4″

11/2″

/16″

(76.2)

(38.1)

(31.8)

(27)

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. All furnaces are designed with a break!away duct flange on the supply air side of the furnace. This allows for installation in the horizontal right or downflow applications. 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.

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11. Ductwork and Filter (Downflow)

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

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.

WARNING

FIRE HAZARD

Failure to follow this warning could result in bodily injury, death, and/or property damage.

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

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

WARNING

BURN HAZARD

Failure to follow this warning could result in bodily injury, death, and/or property damage.

The vent may be hot. Failure to install vent shield properly could result in personal injury.

Install VENT PIPE SHIELD NAHA002VC as described below.

WARNING

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/149° C) within reach of children. Vent shield attaches to side of furnace to cover vent pipe. See Figure 5 in “Installation” section.

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Place furnace on noncombustible subbase on downflow applications, unless installing on non!combustible flooring.

WARNING

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.

Sub-Bases for Combustible Floors - Furnace Only

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 1

/4″ (31.8mm) shorter and 11/8″

(28.6mm) narrower than the minimum required size of the opening in the floor. This is done to maintain a 1″ (25.4mm) clearance between the floor and the plenum.

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

3. 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.

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

Figure 27

Exploded View of Sub!Base for Furnace ONLY

Hole in Floor

25-20-46

Plenum

T A = 4 1/4” (108mm) Minimum

clearance from back of hole to wall or other obstruction.

2″ (50.8mm)

1″ (25.4mm)

2″ (50.8mm)

Setting the Base

Figure 28

Furnace/Coil Box

Subbase Insulation

Wood Screw

Wood Floor

Plenum

25-20-46A

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Table 5 Sub!bases for Combustible Floors Dimensions in(mm)

Sub!base for

Combustible Floors

Part Number

Sub!base for Combustible

Floor Dimensions

Opening In Floor

Opening In

Base For Plenum

Typical Plenum

Dimensions

J* K** L M N P R S T

Subbase for Furnace Only

NAHH001SB

1511/

(398.5)

283/4 (730.3) 149/16 (369.9) 16(406.4)

161/

(412.8)

145/

(371.5)

15 (381)

131/

(342.9)

15 (381)

131/

(342.9)

NAHH002SB

195/

(490.5)

283/4 (730.3) 183/16 (462) 16(406.4)

161/

(412.8)

181/

(463.6)

15 (381)

171/

(435.6)

15 (381)

171/

(435.6)

NAHH003SB

2215/

(582.6)

283/4 (730.3) 2113/16 (554) 16(406.4)

161/

(412.8)

217/

(555.6)

15 (381)

193/

(501.7)

15 (381)

193/

(501.7)

Subbase for Coil Box

NAHH004SB

153/

(25.4)

209/

(522.3)

149/16 (369.9)

161/

(408)

161/

(412.8)

145/

(371.5)

15 (381)

131/

(342.9)

15 (381)

131/

(

342.9)

NAHH005SB

193/

(181.1)

209/

(522.3)

183/16 (462)

161/

(408)

161/

(412.8)

181/

(463.6)

15 (381)

171/

(435.6)

15 (381)

171/

(435.6)

NAHH006SB 23 (284.2)

209/

(522.3)

2113/16 (554)

161/

(408)

161/

(412.8)

217/

(555.6)

15 (381)

193/

(501.7)

15 (381)

193/

(501.7)

Outside Dimension

Base Spacer Side To Side

Converstion: 1 in = 25.4 mm

Figure 29

Exploded View of Base for Downflow Cased Coil

25-21-65n

21/

″

11/

″

Plenum

(63.5mm)

(38.1mm)

Sub-base for Combustible Floors - Downflow Coil Adapter Box

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 1

/4″〈31.8mm) shorter and 11/8″ (28.6mm) narrower than the minimum required size of the opening in the floor. This is done to maintain a 1” (25.4mm) clearance between the floor and the plenum.

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

3. 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 28.

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

Consideration must be given to the height of the base to allow for easy installation of the condensate drain. See Figure 30. This subbase for combustible floors has been designed so that the height of the subbase raises the downflow coil off the floor to allow easy installation of the condensate drain

Condensate Line Raised by Base

Figure 30

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 and Duct Installation Requirements

See Section 10.

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 31. Clips may be obtained from your distributor or fabricated from sheet metal

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(Figure 26). Insert filter into side clips first and push filter back until it is fully engaged into back clip.

Figure 31

Top Mounted Internal Filter

9″

Center Clip side-to-side

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

See Section 10.

12. Checks and Adjustments

Startup

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

ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD

Failure to follow this warning could result in personal 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.

WARNING

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 Propane Gas Conversion Kit instruction manual for furnaces converted to Propane gas.)

Manifold Gas Pressure Adjustment

NOTE: Make adjustment to manifold pressure with burners operating.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Turn OFF gas at shut off before connecting manometer.

WARNING

1. With gas OFF, connect manometer to manifold pressure tap on outlet of gas valve. See Figure 32. Use a manometer with a 0 to 12 in wc range.

Typical Gas Valve

Regulator Adjustment Under Cap

Inlet Pressure Tap

/8 NPT

INLET

OUTLET

Outlet Pressure Tap

/8 NPT

OFF

HONEYWELL

Figure 32

2. Turn gas ON. Operate the furnace by using a jumper wire on the R to W thermostat connection on the control board.

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

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

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

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

6. Remove jumper wire from thermostat connection on control board. Remove manometer connection from manifold pressure tap, and replace plug in gas valve.

7. Check for leaks at plug.

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Natural Gas Input Rating Check

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

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

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

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

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

Example (BTUH)

Natural Gas

BTU Content

per cubic foot

No. of Seconds

Per Hour

Time Per Cubic

Foot in

Seconds

BTU Per

Hour

1,000 3,600 48 75,000

1,000 x 3,600 ÷ 48 = 75,000 BTUH

To Determine the appliance kW input rate from a .05m

test dial

that has been clocked at 80 seconds for one complete revolution.

Example (kW)

Number of

seconds per

hour

Number of

seconds per

complete

rotation

Size of test dial

(.05m

)

kW m3/h

3,600 80 .05 2.25

3,600 ÷ 80 x .05 = 7.2 m3/h

2.25m3/h x 10.35 kWh/m

= 23.28 kW

23.28 x 3.412 = 79,431 BTU

3. Remove jumper wire from R to W.

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

Orifice Sizing

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

Ensure furnace is equipped with the correct main burner orifices. Refer to Table 6 or Table 7 for correct orifice size and manifold pressure for a given heating value and specific gravity for natural and propane gas.

Operation Above 2000′ (610m)Altitude

FIRE, EXPLOSION, CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

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.

WARNING

These furnace may be used at full input rating when installed at altitudes up to 2000′. When installed above 2000′ (610m), the input must be decreased 2% (natural) or 4% (Propane) for each 1000′ (305m) above sea level in the USA. In Canada, the input rating must be derated 5% (natural) or 10% (Propane) 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 6 & Table 7 show the proper furnace manifold pressure and gas orifice size to achieve proper performance based on elevation above sea level for both natural gas and propane gas.

To use the natural gas table, first consult your local gas utility for the heating value of the gas supply. Select the heating value in the first column and follow across the table until the appropriate 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 factory!shipped orifice size is in bold (42). Other sizes must be obtained from service parts.

High Altitude Input Rate =

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

Elevation

ft (m)

High Altitude Multiplier

Natural Gas Propane Gas

2001′ - 3000′

(610 ! 914)

0.95 0.90

3001′ - 4000′ (915 ! 1219)

0.93 0.86

4001′ - 5000′

(1220 ! 1524)

0.91 0.82

5001′ - 6000′

(1524 ! 1829)

0.89 0.78

6001′ - 7000′

(1829 ! 2134)

0.87 0.74

7001′ - 8000′

(2134 ! 2438)

0.85 0.70

* Based on mid!range of elevation.

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MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS

Table 6 NATURAL GAS MANIFOLD PRESSURE (in wc)

HEATING

VALUE

at ALTITUDE

BTU/CU. FT.

MEAN ELEVATION ABOVE SEA LEVEL ! ft(m)

0 to 2000

(0 to 610)

2001 to 3000*

(610 to 914)*

3001 to 4000

(915 to 1219)

4001 to 5000

(1220 to 1524)

5001 to 6000

(1524 to 1829)

6001 to 7000

(1829 to 2134)

7001 to 8000

(2134 to 2438)

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

700 !! !! !! !! !! !! !! !! !! !! !! !! 41 3.7

725 !! !! !! !! !! !! !! !! !! !! 41 3.7 41 3.4

750 !! !! !! !! !! !! !! !! !! !! 41 3.5 42 3.6

775 !! !! !! !! !! !! !! !! 41 3.6 42 3.6 42 3.3

800 !! !! !! !! !! !! 41 3.6 42 3.7 42 3.4 42 3.1

825 !! !! !! !! 41 3.7 41 3.4 42 3.5 42 3.2 42 2.9

850 !! !! !! !! 41 3.5 42 3.6 42 3.3 42 3.0 42 2.8

875 !! !! 41 3.6 42 3.6 42 3.4 42 3.1 42 2.8 42 2.6

900 !! !! 42 3.7 42 3.4 42 3.2 42 2.9 42 2.7 42 2.5

925 41 3.7 42 3.5 42 3.3 42 3.0 42 2.8 42 2.5 44 3.3

950 41 3.5 42 3.3 42 3.1 42 2.9 42 2.6 42 2.4 44 3.1

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

1000 42 3.5 42 3.0 42 2.8 42 2.6 42 2.4 45 3.7 45 3.4

1050 42 3.2 42 2.7 42 2.5 44 3.3 45 3.6 !! !! !! !!

1100 43 3.6 42 2.5 44 3.2 45 3.6 !! !! !! !! !! !!

Conversion: 1 in wc = .25 kPa

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/NFPA

54!2009 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1!05.

* In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design!certified by CSA.

In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (610 to 1372m) above sea level. Use the 2001 to 3000 (610 to 914m) column in Table 6 and Table 7.

Table 7 PROPANE GAS MANIFOLD PRESSURE (in wc)

HEATING VALUE

at ALTITUDE

BTU/CU. FT.

MEAN ELEVATION ABOVE SEA LEVEL ! ft(m)

0 to 2000

(0 to 610)

2001 to 3000*

(610 to 914)*

3001 to 4000

(915 to 1219)

4001 to 5000

(1220 to 1524)

5001 to 6000

(1524 to 1829)

6001 to 7000

(1829 to 2134)

7001 to 8000

(2134 to 2438)

2500 10.0 10.0 9.0 10.0 9.4 8.5 10.0

Orifice Size #54 #54 #54 #55 #55 #55 #56

Conversion: 1 in wc = .25 kPa

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/NFPA

54!2009 or National Standard Of Canada, Natural Gas And Propane Installation Code CSA B149.1!05.

* In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design!certified by CSA.

In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (610 to

1372m) above sea level. Use the 2001 to 3000 (610 to 914m) column in Table 6 and Table 7. The burner orifice part nos. are as follows: Orifice #41 1096942 Orifice #42 1011351 Orifice #43 1011377 Orifice #44 1011352 Orifice #45 1011353 Orifice #54 1011376 Orifice #55 1011354 Orifice #56 1011355

High Altitude Air Pressure Switch

The factory!installed pressure switch need NOT be changed for any furnace installations from sea level up to and including 8,000′ (2438m) altitude

Changing Orifices

1. After disconnecting power and gas supply to the furnace,

remove the burner compartment door, exposing the burner compartment.

2. Disconnect gas line from gas valve so manifold can be removed.

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

4. Remove the four (4) screws holding the manifold and gas valve to the manifold supports. Do not discard any screws. See Figure 33.

5. Carefully remove the manifold assembly.

6. Remove the orifices from the manifold and replace them with proper sized orifices. See Figure 34.

7. Tighten orifices so they are seated and gas!tight. See

Figure 34.

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

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Figure 33

Manifold

25-25-00

Some Models may vary

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

Figure 34

Clearances

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

1.11″ (28.2mm)

1.21″ (30.8mm)

Propane Conversion

An accessory kit shall be used to convert to propane gas use, see the furnace rating plate for the Propane conversion accessory kit part number.

CARBON MONOXIDE POISONING HAZARD

Failure

to follow this warning may result in

personal injury, death, and/or property damage.

NOx inserts for use with Natural Gas units ONLY. If Propane Gas is required, NOx inserts must be removed.

CAUTION

FIRE, EXPLOSION, UNIT DAMAGE HAZARD

Failure

to follow this warning may result in

personal injury, death, and/or property damage.

A Propane conversion accessory kit is required when operating the furnace with Propane gas.

WARNING

*8MPLs and N8MPLs contain NOx inserts.

FOR PROPANE CONVERSION REMOVE SCREWS THAT SECURE THE NOX INSERT AND DISCARD INSERT.

Reinstall screws. See Figure 36 NOTE: It is very important to reinstall the NOx insert mounting

screws.

Figure 35

Removing NOx inserts

25-40-03

Main Burner Flame Check

Allow the furnace to run approximately 10 minutes. Then inspect the main burner flames. See Figure 36.

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.

Main Burner

Burner Face

10!10!78

Figure 36

NOTE: For Ignitor location see Figure 37.

Ignitor Location in(mm)

Figure 37

/16(8)

/4(6.4)

(52.4)

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

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Air Temperature Rise Check

REDUCED FURNACE LIFE HAZARD Failure to follow this caution may result in reduced

furnace life.

Use ONLY the blower motor speed taps insert indicated in the Circulation Air Blower Data for setting air temperature rise.

CAUTION

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.

2. Operate furnace for 10 minutes with all the registers and duct dampers open by using a jumper wire on R to W thermostat connections on the control board.

3. Take readings and compare with range specified on rating plate.

4. 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.

5. Remove the jumper wire after the adjustments are complete.

Changing Blower Speed

ELECTRICAL SHOCK HAZARD

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

Turn OFF power to furnace, lockout, and tag switch with a suitable warning label before changing speed taps.

WARNING

NOTE: The speed taps that the manufacturer sets at the factory

for this furnace are based on a nominal 400 CFM per ton cooling and the basic mid range on the temperature rise for heating.

Since the manufacturer cannot predict the static pressure that will be applied to the furnace, it is the responsibility of the installer dealer/contractor to select the proper speed tap leads for the application when the furnace is installed.

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

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

Table 8 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 “M1” or “M2” location. Connect the wire previously removed from the “Heat” or “Cool” terminal to the vacated “M1” or “M2” terminal.

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

“Cool” terminal and connect that lead to the open terminal at “M1” or “M2” location or tape off. Attach a jumper between

the “Heat” and “Cool” terminals and the remaining motor speed lead.

Note: When using the same speed on motors with (4) speed leads, it will be necessary to tape off the terminal of the motor speed lead removed from the “Heat” or “Cool” terminal with electrical tape since an open terminal will not be available at the “M1” or “M2” location.

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

Continuous-Fan Operation using “G”

Energizing the “G” terminal on the furnace control provides continuous fan operation. This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control. When the FAN switch is turned from auto to ON the fan will operate continuously at “HEAT” speed. EAC will be energized in this mode.

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

Hard Wired Continuous-Fan Operation

A terminal is provided on the furnace control board located in the 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. EAC is not powered in this mode.

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

Separate speed selections for Heat, Cool, and Continuous-Fan

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

Heating and Continuous-Fan Speed the Same

If it is necessary to operate the heating speed and continuous!fan speed using the same blower speed, connect a jumper between the “Heat” and “Cont” terminals on the furnace control board.

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

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13. Furnace Maintenance

FIRE, EXPLOSION, OR CARBON MONOXIDE POISONING HAZARDS

Failure to follow this warning could result in personal injury, death, and/or property damage.

It is recommended that the furnace be inspected and serviced on an annual basis (before the heating season) by a qualified service agency.

WARNING

See “User’s Information Manual”.

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in dangerous operation, personal injury, death, or property damage. Improper servicing could result in dangerous operation, injury, death or property damage.

• Before servicing, disconnect all electrical

power to furnace, lockout, and tag switch with a suitable warning label.

• When servicing controls, label all wires prior to

disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

WARNING

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14. Sequence of Operation & Diagnostics

The following is the normal operating sequence.

Cooling (Y) Request:

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

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

Y & G signals removed from FCB

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

Continuous Circulating Fan (G) Request:

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

• Heat motor speed is energized without delay.

G signal removed from FCB.

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

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

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

Continuous Circulating Fan Hard-Wired (Cont) Request:

Field selected low speed motor tap installed on “CONT” terminal.

• Low speed is energized when power applied to furnace. Operates at this speed continuously while there are no other

blower demands from furnace control. Fan demands from furnace control for heat, cool or “G” will override hard!wired speed tap.

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

Heating (W) Request:

• 24 VAC signal applied to W terminal of FCB.

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

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

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

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

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

W signal removed from FCB.

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

• The inducer runs for a 15 second postpurge period.

• The fan stays at Heat speed.

• The fan de!energizes after the selected Heat Fan Off Delay time expires, timed from the gas valve de!energizing.

HUMIDIFIER ! The 24V HUM is energized when the pressure switch closes on a call for heat. The 115V HUM (called HUM on Control) is energized when the inducer is energized.

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

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

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

Heating Request with Gas Shut Off:

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

• Inducer motor turns on

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

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

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

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

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

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

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

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

flashing error code 6 + 1.

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

Control Board Diagnostic Codes (See Figure 38)

OFF = 24VAC or 115VAC is off, fuse is open Heartbeat = Normal operation or no previous Diagnostic Code ON SOLID = Soft Lockout ! Furnace Control Error (1 hr delay) If code repeats immediately following power reset then replace control 1 Flash = Not used 2 Flashes = Pressure switch(es) closed when should be open 3 Flashes = Pressure switch open when should be closed 4 Flashes = Limit or roll!out switch open (less than 2 minutes) 5 Flashes = Flame sensed out of sequence 6 Flashes = Failure to ignite or flame sense lost while running 6 + 1 Flashes = Soft Lockout ! Max trials for ignition reached (3hr delay) 7 Flashes = Soft Lockout ! Limit or roll!out switch open longer than 2 minutes (1 hr delay)

(roll!out switch requires manual reset) 8 Flashes = Permanent Lockout ! Gas valve relay contact stuck closed or miswired gas valve (power reset only) 10 Flashes = Line voltage (115VAC) polarity reversed. If twinned, refer to twinning kit instructions

* If status code recall is needed, briefly (2!3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared after 72 hours or upon power reset.

* Proper flame sense microamps: 0.7 microamps D.C. minimum, 2.0 ! 4.0 microamps nominal

Figure 38 Control Board

Diagnostic Light

115 VAC HUM

FUSE

24 VAC HUM

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Models

N8MPN050B12B2 N8MPL050B12B2 N8MPN075B12B2 N8MPL075B12B2 N8MPN075F16B2 N8MPL075F16B2 N8MPN100F14B2 N8MPL100F20B2 N8MPN100F20B2 N8MPL100J22B2 N8MPN100J22B2 N8MPL125J20B2 N8MPN125J20B2 N8MPL125J22B2 N8MPN125J22B2

*8MPN050B12B2 *8MPL050B12B2 *8MPN075B12B2 *8MPL075B12B2 *8MPN075F16B2 *8MPL075F16B2 *8MPN100F14B2 *8MPL100F20B2 *8MPN100F20B2 *8MPL100J20B2 *8MPN100J20B2 *8MPL125J20B2 *8MPN125J20B2 *8MPN150J20B2

* Denotes Brand

International Comfort Products, LLC

Lewisburg, TN 37091 U.S.A.

Save This Manual For Future Reference

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

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 (

oF/o

50,000 40,000

35-65/19-36

75,000 60,000

35-65/19-36

75,000 60,000

25-55/14-30

100,000

80,000

30-60/17-33

100,000

80,000

35-65/19-36

100,000

80,000

30-60/17-33

125,000 100,000

30-60/17-33

125,000 100,000

30-60/17-33

Electrical (Volts/Hz)

115/60 115/60 115/60 115/60 115/60 115/60 115/60 115/60

Rating Plate Amps.

9.7 9.2 9.7 8.9 11.7 13.2 11.7 13.2

Gas Type

Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane

Transformer Size (VA) T'stat Heat Anticipator

40 .50

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 Regulation Type

Manifold Press (in wc/Pa)

VR8205S

SNAP

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

Ignition Type/Series Hot Surface

Combustion

Flue Outlet Size (Inches)

4 4 4 4 4 4 4 4

Limits & Controls

Thermal Sensor (

oF/o

Limit Control

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

Std. Pressure Sw. (Part No)

Press -Close (in wc/Pa) Press -Open (in wc/Pa)

1013529

-0.69/-172

-0.59/-147

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

Integrated

60,100,140,180

Blower Data

Size Inches (D x W) Motor Type/H.P. Cap. Mfd/Volts Filter Type (600 FPM) Filter Size inches (Not Supplied) mm 1600 CFM and over inch(qty) mm(qty) Min. Cool Cap. (Tons) Max. Cool Cap. (Tons)

11-8

PSC/

10/370

Washable

14x25x1

355x635x25

1.5 3

11-8

PSC/

7.5/370

Washable

14x25x1

355x635x25

1.5 3

11-10

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 4

11-10

PSC/

7.5/370

Washable

16x25x1

406x635x25

-2

3.5

11-10

PSC/

10/370

Washable

16x25x1(2)

406x635x25(2)

16x25x1(2)

406x635x25(2)

3 5

11-10

PSC/

40/370

Washable

20x25x1

508x635x25

16x25x1

406x635x25(2))

5.5

11-10

PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1

406x635x25(2)

3 5

11-10

PSC/

40/370

Washable

20x25x1

508x635x25

16x25x1

406x635x25(2)

5.5

Gas Conversion Kits

Nat to Propane NAHA001LP (1172958*) Propane to Nat NAHA001NG (1172960*)

* Must be ordered from Service Parts

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

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 (

oF/o

50,000 40,000

35-65/19-36

75,000 60,000

35-65/19-36

75,000 60,000

25-55/14-30

100,000

80,000

35-65/19-36

100,000

80,000

30-60/17-33

125,000 100,000

30-60/17-33

125,000 100,000

30-60/17-33

Electrical (Volts/Hz) 115/60 115/60 115/60 115/60 115/60 115/60 115/60

Rating Plate Amps. 9.7 9.2 9.7 11.7 13.2 11.7 13.2

Gas Type Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane

Transformer Size (VA) T'stat Heat Anticipator

.50

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 Regulation Type

Manifold Press. (in wc/Pa)

VR 8205S

SNAP

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

Ignition Type/Series Hot Surface

Combustion

Flue Outlet Size (Inches)

4 4

Limits & Controls

Thermal Sensor (

oF/o

Limit Control

300/149

See Parts List

300/149

See Parts Listt

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

300/149

See Parts List

Std. Pressure Sw. (Part No)

Press -Close (in wc/Pa) Press -Open (in wc/Pa)

1013529

-0.69/-172

-0.59/-147

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

Integrated

60,100,140,180

Blower Data

Size Inches (D x W) Motor Type/H.P. Cap. Mfd/Volts Filter Type (600 FPM) Filter Size inches (Not Supplied) mm 1600 CFM and over inch(qty) mm(qty) Min. Cool Cap. (Tons) Max. Cool Cap. (Tons)

11-8

PSC/

10/370

Washable

14x25x1

355x635x25

1.5 3

11-8

PSC/

7.5/370

Washable

14x25x1

355x635x25

1.5 3

11-10

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 4

11-10

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 5

11-10

PSC/

40/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

5.5

11-10

PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

3 5

11-10

PSC/

40/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

5.5

Gas Conversion Kits

Nat to Propane NAHA001LP (1172958*) Propane to Nat NAHA001NG (1172960*)

* Must be ordered from Service Parts

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are 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 (

oF/o

50,000 40,000

35-65/19-36

75,000 60,000

30-60/17-33

75,000 60,000

30-60/17-33

100,000

81,000

35-65/19-36

100,000

81,000

35-65/19-36

100,000

81,000

35-65/19-36

125,000 101,000

35-65/19-36

150,000 121,000

35-65/19-36

Electrical (Volts/Hz) 115/60 115/60 115/60 115/60 115/60 115/60 115/60 115/60

Rating Plate Amps. 9.7 9.0 9.7 9.2 12.0 12.0 12.0 13.5

Gas Type Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane

Transformer Size (VA) T'stat Heat Anticipator

40 .50

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 Regulation Type

Manifold Press. (in wc/Pa)

VR 8205S

SNAP

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

Ignition Type/Series Hot Surface

Combustion

Flue Outlet Size (Inches)

4 4 4

4 4

Limits & Controls

Thermal Sensor (

oF/o

C) Limit Control Auxiliary Limit (

oF/o

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

Std. Pressure Sw. (Part No)

Press -Close (in wc/Pa) Press -Open (in wc/Pa)

1013529

-0.69/-172

-0.59/-147

Furnace Control (Type) Furnace Control On (Timed-secs) Off

Integrated

60,100,140,180

Blower Data

Size Inches (D x W) Motor Type/H.P. Cap. Mfd/Volts Filter Type (600 FPM) Filter Size inches (Not Supplied) mm 1600 CFM and over inch(qty) mm(qty) Min. Cool Cap. (Tons) Max. Cool Cap. (Tons)

11-8

PSC/

10/370

Washable

14x25x1

355x635x25

1.5 3

11-8

PSC/

7.5/370

Washable

14x25x1

355x635x25

1.5 3

11-10

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 4

11-10

PSC/

7.5/370

Washable

16x25x1

406x635x25

-2

3.5

11-10

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 5

11-10

PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

3 5

11-10

PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

3 5

12-12

PSC/

40/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

3 5

Gas Conversion Kits

Nat to Propane NAHA001LP (1172958*) Propane to Nat NAHA001NG (1172960*)

* Must be ordered from Service Parts

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

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 (

oF/o

50,000 40,000

35-65/19-36

75,000 60,000

30-60/17-33

75,000 60,000

30-60/17-33

100,000

81,000

35-65/19-36

100,000

81,000

35-65/19-36

125,000 101,000

35-65/19-36

Electrical (Volts/Hz) 115/60 115/60 115/60 115/60 115/60 115/60

Rating Plate Amps. 9.7 9.0 9.7 12.0 12.0 12.0

Gas Type Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane Nat Propane

Transformer Size (VA) T'stat Heat Anticipator

.50

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 Regulation Type

Manifold Press. (in wc/Pa)

VR 8205S

SNAP

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

3.5/ 872

10.0/ 2490

Ignition Type Hot Surface

Combustion

Flue Outlet Size (Inches)

4 4

Limits & Controls

Thermal Sensor (

oF/o

C) Limit Control Auxiliary Limit (

oF/o

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

300/149

See Parts List

130/54

Std. Pressure Sw. (Part No)

Press -Close (in wc/Pa) Press -Open (in wc/Pa)

1013529

-0.69/-172

-0.59/-147

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

Integrated

60,100,140,180

Blower Data

Size Inches (D x W) Motor Amps/RPM Motor Type/H.P. Cap. Mfd/Volts Filter Type Filter Size inches (Not Supplied) mm 1600 CFM and over inch(qty) mm(qty) Min. Cool Cap. (Tons) Max. Cool Cap. (Tons)

11-8

10.3/1100 PSC/

10/370

Washable

14x25x1

355x635x25

1.5 3

11-8

8/1050

PSC/

7.5/370

Washable

14x25x1

355x635x25

1.5 3

11-10

10.3/1100 PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 4

11-10

10/1050

PSC/

10/370

Washable

16x25x1

406x635x25

16x25x1(2)

406x635x25(2)

3 5

11-10

11.9/900 PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1(2)

506x635x25(2)

3 5

11-10 10/1050 PSC/

10/370

Washable

20x25x1

508x635x25

16x25x1(2)

406x635x25(2)

3 5

Gas Conversion Kits

Nat to Propane NAHA001LP (1172958*) Propane to Nat NAHA001NG (1172960*)

* Must be ordered from Service Parts

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

15. Circulation Air Blower Data (CFM)

N8MPN/L050B12 & *8MPN/L050B12 (1)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.10 25 472 223 704 332 1167 551 1387 655

0.20 50 419 198 671 317 1135 536 1338 631

0.30 75 365 172 638 301 1102 520 1288 608

0.40 100 328 155 605 286 1069 504 1241 586

0.50 125 290 137 572 270 1035 488 1194 563

0.60 149 250 118 547 258 987 466 1132 534

0.70 174 209 99 522 246 939 443 1070 505

0.80 199 --- --- 483 228 880 415 1004 474

0.90 224 --- --- 443 209 820 387 937 442

1.00 249 --- --- 370 175 753 355 858 405

N8MPN/L075B12 & *8MPN/L075B12 (1)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 695 328 963 454 1220 576 1559 736

0.2 50 670 316 946 446 1202 567 1511 713

0.3 75 644 304 928 438 1183 558 1463 690

0.4 100 616 291 901 425 1151 543 1412 666

0.5 125 588 277 873 412 1118 528 1361 642

0.6 149 564 266 822 388 1068 504 1300 613

0.7 174 540 255 771 364 1017 480 1239 585

0.8 199 502 237 723 341 959 453 1161 548

0.9 224 463 218 675 319 900 425 1083 511 1 249 413 195 615 290 835 394 998 471

N8MPN/L075F16 & *8MPN/L075F16 (1)(3)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 598 282 841 397 1427 673 1861 878

0.2 50 499 235 795 375 1406 664 1816 857

0.3 75 400 189 748 353 1384 653 1770 835

0.4 100 345 163 708 334 1364 644 1724 814

0.5 125 289 136 667 315 1343 634 1677 791

0.6 149 263 124 625 295 1299 613 1612 761

0.7 174 236 111 582 275 1254 592 1547 730

0.8 199 --- --- 530 250 1192 563 1454 686

0.9 224 --- --- 477 225 1129 533 1360 642 1 249 --- --- 436 206 1016 479 1262 596

NOTE: (1) Data based on Bottom Only or One Side return.

(2) Data based on Both Sides or Bottom plus One Side

(3) 075F16 Reduce airflow by 5% if Bottom Only return.

(4) 100F20 Reduce airflow by 10% if Bottom Only return. (5) 125J20 Reduce airflow by 5% if Bottom Only return. (6) 125J22 Reduce airflow by 10% if Bottom Only return. (7) 150J20 Reduce airflow by 10% if Bottom Only return. (8) Gray area is above maximum temperature rise range.

NOTE: (1) Gray area is above maximum temperature rise range.

# CFM ! Cubic feet per minute airflow. L/s ! Liters per second

Filter required for each return!air inlet. Airflow performance includes 1″ (25.4mm) washable ! 600 FPM (3.0 m/s) max filter media.

N8MPN100F14 & *8MPN100F14 (1)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 770 363 949 448 1328 627 1760 831

0.2 50 709 335 911 430 1282 605 1718 811

0.3 75 648 306 873 412 1235 583 1675 790

0.4 100 596 281 823 388 1175 555 1613 761

0.5 125 544 257 772 364 1115 526 1551 732

0.6 149 501 236 728 344 1076 508 1478 697

0.7 174 457 216 684 323 1036 489 1404 663

0.8 199 409 193 628 296 966 456 1310 618

0.9 224 361 170 572 270 895 422 1215 573 1 249 308 145 507 239 811 383 1093 516

N8MPN/L100F20 & *8MPN/L100F20 (2)(4)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 831 392 1125 531 1582 747 2216 1046

0.2 50 823 388 1124 530 1585 748 2198 1037

0.3 75 814 384 1123 530 1588 749 2179 1028

0.4 100 798 377 1120 529 1583 747 2127 1004

0.5 125 781 369 1117 527 1577 744 2074 979

0.6 149 749 353 1085 512 1559 736 1992 940

0.7 174 717 338 1053 497 1541 727 1909 901

0.8 199 663 313 1009 476 1457 688 1827 862

0.9 224 609 287 964 455 1373 648 1745 824 1 249 561 265 888 419 1307 617 1641 774

N8MPN/L100J22 (2)(8)

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 1785 842 1997 942 2292 1082 2519 1189

0.2 50 1765 833 1970 930 2245 1059 2468 1165

0.3 75 1741 822 1941 916 2206 1041 2410 1137

0.4 100 1711 807 1902 898 2154 1017 2351 1109

0.5 125 1674 790 1861 878 2097 990 2284 1078

0.6 149 1633 771 1807 853 2036 961 2206 1041

0.7 174 1581 746 1749 825 1965 927 2121 1001

0.8 199 1517 716 1683 794 1883 889 2030 958

0.9 224 1428 674 1597 754 1793 846 1928 910 1 249 1326 626 1478 697 1667 787 1814 856

MAX CFM (L/s) for Factory Washable Filters

Filter Size in(mm) CFM L/s

14 x 25 356 x 635 1400 661

16 x 25 406 x 635 1600 755

20 x 25 508 x 635 2000 944

24 x 25 610 x 635 2500 1180

Max CFM (L/s) based on 600 FPM (3.0 m/s)

*See Table for bellyband location on motor

* Denotes Brand

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

Circulation Air Blower Data Continued

*8MPN/L100J20 (2)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 773 365 1045 493 1453 686 2147 1013

0.2 50 766 361 1029 486 1461 689 2142 1011

0.3 75 755 356 1037 489 1469 693 2128 1004

0.4 100 737 348 1037 489 1469 693 2113 997

0.5 125 712 336 1020 481 1459 689 2078 981

0.6 149 683 322 1013 478 1446 682 2029 958

0.7 174 647 305 979 462 1424 672 1963 926

0.8 199 603 285 942 445 1400 661 1892 893

0.9 224 554 261 894 422 1347 636 1795 847 1 249 497 235 828 391 1262 596 1705 805

N8MPN/L125J22 (2)(6)(8)

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 1901 897 2121 1001 2362 1115 2463 1162

0.2 50 1867 881 2077 980 2303 1087 2424 1144

0.3 75 1833 865 2033 959 2244 1059 2385 1126

0.4 100 1789 844 1985 937 2172 1025 2301 1086

0.5 125 1745 824 1936 914 2100 991 2217 1046

0.6 149 1685 795 1855 875 1997 942 2125 1003

0.7 174 1624 766 1773 837 1894 894 2033 959

0.8 199 1533 723 1671 789 1804 851 1927 909

0.9 224 1442 681 1569 740 1714 809 1821 859

1 249 1329 627 1455 687 1583 747 1685 795

NOTE: (1) Data based on Bottom Only or One Side return.

(2) Data based on Both Sides or Bottom plus One Side

(3) 075F16 Reduce airflow by 5% if Bottom Only return.

* Denotes Brand

NOTE: (1) Gray area is above maximum temperature rise range.

# CFM ! Cubic feet per minute airflow. L/s ! Liters per second

Filter required for each return!air inlet. Airflow performance includes 1″ (25.4mm) washable ! 600 FPM (3.0 m/s) max filter media.

N8MPN/L125J20 & *8MPN/L125J20 (2)(5)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 860 406 1149 542 1666 786 2147 1013

0.2 50 848 400 1154 545 1622 765 2137 1008

0.3 75 836 395 1158 546 1577 744 2126 1003

0.4 100 821 387 1149 542 1569 740 2137 1008

0.5 125 805 380 1140 538 1561 737 2148 1014

0.6 149 782 369 1111 524 1539 726 2035 960

0.7 174 758 358 1081 510 1516 715 1922 907

0.8 199 710 335 1045 493 1472 695 1845 871

0.9 224 661 312 1009 476 1428 674 1767 834 1 249 614 290 925 437 1357 640 1663 785

*8MPN150J20 (2)(7)(8) * Denotes Brand

Exterrnal Static Pressure

(in wc/Pa)

Air Delivery in CFM (L/s)

Furnace Rated @0.5 in wc (125 Pa) ESP

TAP LOW MED L MED H HIGH

in wc Pa CFM L/s CFM L/s CFM L/s CFM L/s

0.1 25 1656 782 1915 904 2168 1023 2385 1126

0.2 50 1620 765 1851 874 2129 1005 2360 1114

0.3 75 1583 747 1787 843 2090 986 2335 1102

0.4 100 1545 729 1742 822 2044 965 2274 1073

0.5 125 1507 711 1697 801 1997 942 2212 1044

0.6 149 1449 684 1647 777 1927 909 2149 1014

0.7 174 1390 656 1596 753 1856 876 2085 984

0.8 199 1301 614 1521 718 1755 828 1992 940

0.9 224 1212 572 1445 682 1654 781 1898 896 1 249 1125 531 1337 631 1561 737 1777 839

MAX CFM (L/s) for Factory Washable Filters

Filter Size in(mm) CFM L/s

14 x 25 356 x 635 1400 661

16 x 25 406 x 635 1600 755

20 x 25 508 x 635 2000 944

24 x 25 610 x 635 2500 1180

Max CFM (L/s) based on 600 FPM (3.0 m/s)

*See Table for bellyband location on motor

Bellyband Location on Motor

A Dimension

Bellyband Location on Motor

A Dimension

Model *8MPN *8MPL inches mm Model N8MPN N8MPL inches mm

050B12B2 X X 13/

35.1 050B12B2 X X 13/

35.1

075B12B2 X X 13/

35.1 075B12B2 X X 13/

35.1

075F16B2 X X 13/

35.1 075F16B2 X X 13/

35.1

100F14B2 X N/A 13/

35.1 100F14B2 X N/A 13/

35.1

100F20B2 X X 17/

46 100F20B2 X X 17/

100J20B2 X X 17/

46 125J22B2 X X 15/

41.9

125J20B2 X X 17/

46 125J20B2 X X 17/

150J20B2 X N/A 15/

41.9 125J22B2 X X 15/

41.9

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

441 01 2613 05

Specifications are subject to change without notice

Wiring Diagram N8MPN/L, *8MPN/L

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

National Excelsior Company www.excelsiorhvac.com

Subject to change without notice.

INDUCED!COMBUSTION GAS FURNACE

PARTS REPLACEMENT INFORMATION GUIDE

CASING GROUP

Outer door Blower door Door bracket Top filler plate Bottom encloser

INDUCER GROUP

Housing assembly Pressure switch Inducer assembly Vent elbow assembly Inducer blower gasket

BLOWER GROUP

Blower housing Blower hanger Blower partition Blower cutoff (Panel) Blower motor Blower wheel Capacitor (where used) Capacitor strap (where used)

FILTER GROUP

Filter(s) ! washable (1!in.)

HEAT EXCHANGER GROUP

Heat exchanger cell Cell Panel Low NOx baffle (California models only)

ELECTRICAL GROUP

Control bracket Junction box Limit switch(es) Circuit board Door switch Transformer Wiring harness 24v Wiring harness 120v

GAS CONTROL GROUP

Manifold Burner Assembly Orifice

PRODUCT NOMENCLATURE

Flame sensor Hot surface ignitor Gas valve Manual reset limit switch Burner support assembly

FIRE, EXPLOSION, ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in dangerous operation, personal injury, death or property damage.

Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, local gas supplier, or your distributor or branch for information or assistance. The qualified installer or agency must use only factory-authorized and listed kits or accessories when modifying this product.

WARNING

* 8 MP L 0 75 B 1 2 B #

* = Brand Specific Engineering Rev.

Brand Efficiency Denotes minor change

8 = Non!Condensing, 80+% Gas Furnace

9 = Condensing, 90+% Gas Furnace Marketing Digit

Installation Configuration Denotes major change

UP = Upflow DN = Downflow Cooling Airflow

UH = Upflow/Horizontal HZ = Horizontal 08 = 800 CFM 16 = 1600 CFM

DH = Downflow/Horizontal 12 = 1200 CFM 20 = 2000 CFM

MP = Multiposition, Upflow/Downflow/Horizontal 14 = 1400 CFM 22 = 2200 CFM

Major Design Feature

1 = One (Single) Pipe N = Single Stage Cabinet Width

2 = Two Pipe P = PVC Vent B = 15.5″ Wide J = 22.8″ Wide

D = 1 or 2 Pipe T = Two Stage F = 19.1″ Wide L = 24.5″ Wide

L = Low NOx V = Variable Speed Input (Nominal MBTUH)

* Denotes Brand (C, H, T)

Have available the product/model number and the serial number located on the unit rating plate to ensure correct replacement parts.

TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or the classified section of your local telephone directory under the “Heating Equipment“ or “Air Conditioning Contractors and Systems” headings for dealer listing by brand name, or contact:

International Comfort Products, LLC

Consumer Relations Department

P.O. Box 128

Lewisburg, TN 37091, USA

931!270!4100

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Subject to change without notice.

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Specifications are subject to change without notice.

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International comfort products N8MPL050B12, N8MPL075B12, N8MPL075F16, N8MPL100F20, N8MPL100J22 Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual