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

...

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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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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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.

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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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