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441 06 1040 03 Feb. 2010Specifications subject to change without notice.

INSTALLATION INSTRUCTIONSNAHA001DH & NAHA002DH Chimney Adapter Kit

Category I Furnace Vent Accessory

KEEP THESE INSTRUCTIONS WITH THE FURNACE

SAFETY REQUIREMENTSImproper ins ta l la t ion , ad jus tment , a l te ra t ion , serv ice ,maintenance, or use can cause explosion, fire, electrical shock, orother conditions which may cause death, personal injury, orproperty damage. Consult a qualified installer, service agency, oryour distributor or branch for information or assistance. Thequalified installer or agency must use factory−authorized kits oraccessories when modifying this product. Refer to the individualinstructions packaged with the kits or accessories when installing.Follow all safety codes. Wear safety glasses, protective clothing,and work gloves. Have fire extinguisher available. Read theseinstructions thoroughly and follow all warnings or cautionsincluded in literature and attached to the unit. Consult localbuilding codes, the current editions of the National Fuel Gas Code(NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code(NEC) NFPA 70.In Canada refer to the current editions of the National Standardsof Canada CAN/CSA−B149.1 and .2 Natural Gas and PropaneInstallation 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 ormanuals, be alert to the potential for personal injury. Understandthese signal words; DANGER, WARNING, and CAUTION. Thesewords are used with the safety−alert symbol. DANGER identifiesthe most serious hazards which will result in severe personalinjury or death. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identify unsafepractices which may result in minor personal injury or product andproperty damage. NOTE is used to highlight suggestions whichwill result in enhanced installation, reliability, or operation.

Read the entire instruction manual before starting theinstallation.

This kit allows induced draft furnace series N8MPN, N8MPL,*8MPN, *8MPL, *8MPT & *8MPV (* denotes brand) to operate asdraft hood equipped, Category I appliances in DOE Regions I − V(99% winter design temperature of −10°F or above). The addeddilution air through the draft hood kit decreases the condensate wettime allowing these fan induced combustion furnaces to be ventedinto properly constructed and sized, clay−tile lined, masonrychimneys per these instructions.

These kits are permitted to be used with only the following furnacemodels (See Table 1). Do not use this kit with any other furnacemodels.

Table 1 Kit Usage

Kit Part No. Furnace Model and size

NAHA001DH

N8MPN/L050, 075 & 100*8MPN/L050, 075 & 100

*8MPT075 & 100+*8MPV075 & 100+

NAHA002DHN8MPN/L125 & 150*8MPN/L125 & 150

*8MPT125 & *8MPV125

* Denotes brand+ *8MPT050B12 and *8MPV05012 are NOT permitted with NAHA001DH

The furnace and kit combinations are C.S.A. design−certified asALTERNATIVE VENTING DESIGNS.

! CAUTIONPERSONAL INJURY HAZARD

Failure to follow this caution may result in personalinjury.

C.S.A. design−certified furnaces for use with chimneyadapter kits on masonry chimneys are identified ontheir rating plates. These markings identify whichchimney adapter kit number is permitted to be usedwith each furnace model number. Chimney adapterkits are for use with ONLY furnaces having factory−authorized chimney adapter kit numbers marked onthe furnaces.

! WARNINGELECTRIC SHOCK HAZARD/FIRE AND/OR EXPLOSION HAZARD.Turn OFF gas supply at manual gas valve before turn-ing OFF electric power supply and starting installa-tion.Turn OFF electric power supply at disconnect switchor service panel before starting installation.Failure to follow this warning can result in propertydamage, equipment damage, personal injury and/ordeath.

441 06 1040 03 2Specifications subject to change without notice.

Masonry Chimney ApplicationsThese kits and furnaces shall be applied in accordance with thefollowing section titled Chimney Adapter Application Requirements.The Masonry Chimney Application Requirements section with Table9A and Table 9B inside the back page of this instruction identifies avery small number of exterior masonry chimney applications that arepermitted without the use of the chimney adapter kit.Chimney Adapter Application RequirementsThis chimney adapter kit is permitted in accordance with NFGC andNSCNGPIC as an ALTERNATIVE VENTING DESIGN.The requirements that follow in part A apply to both single−furnaceand multiple−appliance applications. After completing part A,continue to part B for a single furnace application,or continue to partC for a multiple appliance application. After completing part B or C,continue to the INSTALLATION OF CHIMNEY ADAPTER section.

A. Single Furnace and Multiple Appliances(Single furnace, and single furnace and draft hood−equipped

water heater(s)vented into a chimney.)

1. This kit is permitted to be used in any building in which thespace surrounding the furnace is not depressurized by morethan 0.02 in wc (5 Pa) below outdoor pressure by equipmentsuch as exhaust fans and clothes dryers.

2. Temperature of air surrounding furnace and ventconnector(s)shall be 60° F (40° C) or warmer.

3. Furnace rating plate is marked with kit number that ispermitted to be used.

4. Chimney construction shall be in good condition and shallconform to the Standard for Chimneys, Fireplaces,Vents,andSolid Fuel Burning Appliances NFPA 211−2006 in the UnitedStates and to a Provincial or Territorial Building Code inCanada (in its absence, the National Building Code ofCanada). See inspection chart on next page.

5. High altitude: Although appliance input is derated starting at2000′ (609.6m) altitude, use sea level input for all altitudes inthis chimney sizing instruction.

6. Furnace vent connector lateral length, clay tile liner size, andchimney height shall conform to Table 2.

7. Maintain required clearance to combustible materials. Seefurnace rating plate for Minimum−Clearance−to−Combustion−Construction, which includes minimumclearance to combustible construction for chimney adapter,when used.

8. Appliance application and operation has significant impact onsuccessful chimney performance. Follow furnace installationinstructions in general and, in particular, the APPLIANCEAPPLICATION REQUIREMENTS in the VENTINGREQUIREMENTS section. See the NFGC, NSCNGPIC, orauthority having jurisdiction for all other venting requirements.

Table 2 Chimney Sizing Table

FurnaceModel No.N8MPN/L*8MPN/L*8MPT*8MPV

Chimney Adapter KitPart No.

Furnace Vent ConnectorLateral Max. Length

ft.(m)

Chimney Clay Tile LinerMax. Nominal Size or Inside

AreaIn. or In.2

(mm or mm2)

Chimney Max. Heightft.(m)

050+ NAHA001DH 9 (3)

8 x 8 or 42.7(203 x 203 or 27548) 30 (9)

8 x 12 or 63.6(203 x 305 or 41032) 25 (8)

075 NAHA001DH 9 (3)

8 x 8 or 42.7(203 x 203 or 27548) 30 (9)

8 x 12 or 63.6(203 x 305 or 41032) 25 (8)

100 NAHA001DH 9 (3)8 x 12 or 63.6

(203 x 305 or 41032) 35 (11)

125 NAHA002DH 10 (3)12 x 12 or 83.3

(305 x 305 or 53742) 35 (11)

N8MPN/L*8MPN/L

150NAHA002DH 10 (3)

12 x 12 or 83.3(305 x 305 or 53742) 35 911)

* Denotes brand+*8MPT050B12 and *8MPV050B12 are NOT permitted with NAHA001DH.

441 06 1040 033 Specifications subject to change without notice.

Chimney InspectionFor additional requirements refer to National Fuel Ga Code NFPA 54/ANSI Z223.1 and NFPA 211 Chimneys, Fireplaces, Vents and SolidFuel Burning Appliances in the U.S.A. or to the Canadian Installation Code CSA−B149.1 in Canada.

Chimney isacceptable for use

Crowncondition:

Missing mortaror brick?

Rebuildcrown

IsChimney properlylined with clay tile

liner?

Yes

Yes

No

No

Yes

Isliner and topseal in good

condition

No

Debris in cleanout? Mortar, tile,

metal vent, fuel oil residue?

Repairliner or top seal

or reline chimney asnecessary.

Reline

Yes Repair

Yes

No

YesClay

tile misalignment,missing sections,

gaps?

No

Is Chimney lined with properlysized, listed liner or

Type-B vent? Line chimney with properlysized, listed flexible metal

liner or Type-B vent per NFGC orNSCNGPIC Vent Sizing Tablesand liner or vent manufacturer's

installation instructions.

CHIMNEY INSPECTION CHART

Yes

No

No

Mortar ortile debris?

Yes Remove mortar and tile debris?

NoRemove metal vent or liner.

ConsultPart B of chimneyadapter venting instructions for

applicationsuitability.

Chimneyexposed to outdoors

below roof line?Is Chimney to

be dedicated to asingle furnace?

YesInstall chimney

adapter perinstructions.

Not Suitable

Not Suitable

Suitable

No

Consult Part C of chimneyadapter venting instructions for

applicationsuitability.

Suitable

Install chimneyadapter perinstructions.

No

Condensatedrainage at bottom

of chimney?Yes

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


B. Single Furnace

(Single furnace without a draft hood−equipped water heater

vented into a chimney.)

1. The 99% winter design temperature * shall determinepermitted locations for clay tile−lined masonry chimneys asshown in Table 3:

2. Type−B double−wall metal vent (with up to 4 elbows) shall beused exclusively for furnace vent connector.

3. Furnace vent connector shall be same size as ChimneyAdapter outlet.

4. See Table 2 for maximum length of furnace vent connectorlateral.

NOTE: See Figure 5 while reviewing the following requirements.

5. The minimum chimney size shall conform to Table 4.6. See Table 2 for maximum chimney size and maximum

chimney height.

Table 3 Chimney Conditions

MINIMUM 99% WINTER DESIGN TEMPERATURE*

PERMITTED CHIMNEY LOCATION

−25° F (−32° C) or Warmer Interior Masonry Chimney**

+17° F (−8° C) or Warmer Exterior Masonry Chimneys***

* The 99% Winter Design Dry−Bulb (db) temperatures are foundin the 2005 ASHRAE Fundamentals Handbook CD and Chapter28. Figure G−19 in the NFGC (Appendix G) also provides winterdesign temperatures for some locations.

** Chimneys not exposed to the outdoors below the roof−line.*** Chimneys with one or more sides exposed to the outdoors below theroof−line.

Table 4 Single-furnace - Masonry Chimney Flue Capacity With Type-BDouble-wall Vent Connector

VENTHEIGHT

Hft (m)

LATERALL

ft (m)

MINIMUM “NAT Max” INTERNAL AREA OF MASONRYCHIMNEY FLUE, SQUARE IN.

28 38 50 63 78 95

Furnace Input Rating in Thousands of Btu per Hour

NATMax

NATMax

NATMax

NATMax

NATMax

NATMax

6 (2)2 (.6)5 (1.5)

8682

130117

180165

247231

320298

401376

8 (2.5)2 (.6)5 (1.5)8 (2.4)

938883

145134127

198183175

266247239

350328318

446423410

10 (3)2 (.6)5 (1.5)10 (3)

1039687

162148139

221204191

298277263

388365347

491466444

15 (4.5)2 (.6)5 (1.5)10 (3)

11410797

179164153

250231216

336313296

441416394

562513567

20 (6)2 (.6)5 ( 1.5)10 (3)

124116107

201184172

274254237

375350332

491463440

627597566

30 (9)2 (.6)5 (1.5)10 (3)

137128115

216198184

303281236

421393373

558526500

717683648

35 (9)2 (.6)5 (1.5)10 (3)

143134121

225206192

315291273

435406386

577544517

741706669

NOTE: Table 4 was extracted from the current editions of theNational Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1 in UnitedStates, or National Standards of Canada CAN/CSA−B149.1 and .2in Canada.

Table 5 Vent Connector Materials

MINIMUM 99%WINTER DESIGNTEMPERATURE1

CHIMNEYLOCATION

FURNACE VENTCONNECTOR

MATERIAL

WATER HEATERVENT

CONNECTORMATERIAL

-25° F (-32° C) to-10° (-23° C)

Interior Masonry

Chimneys2

Listed Type-BDouble-WallMetal Pipe

Listed Type-BDouble-Wall Metal

Pipe or Single-Wall Galvanized

Steel Pipe

Exterior Masonry

Chimneys3Not Permitted Not Permitted

-10° F (-23° C) orWarmer

InteriorMasonry

Chimneys2



Steel Pipe



Steel Pipe

ExteriorMasonry

Chimneys3

Listed Type-BDouble-WallMetal Pipe



Steel Pipe

* The 99% Winter Design Dry−Bulb (db) temperatures are foundin the 2005 ASHRAE Fundamentals Handbook CD and Chapter28.

2 Chimneys not exposed to outdoors below roof−line.3 Chimneys with 1 or more sides exposed to outdoors below roof−line.

C. Multiple Appliances(Single furnace common−vented with a draft hood−equipped

water heater(s) into a chimney.)

1. The minimum 99% winter design temperature* and chimneylocation shall determine permitted vent connector materialshown in Table 5:

2. Furnace vent connector rises shall not exceed 3′(.9m).

3. An operational draft hood−equipped water heater shall becommon−vented with furnace. Additional drafthood−equipped appliances are permitted to becommon−vented with furnace.

4. Each vent connector is permitted up to 4 elbows.

5. Furnace vent connector shall be same size as ChimneyAdapter outlet.

6. Water heater vent connector shall be 4″ diameter with no morethan 6′ of lateral (horizontal connector length), with waterheater draft hood outlet sizes of 3″ and 4″ diameter. Use a 3″ X4″ vent increaser with a 3″ draft hood outlet.

7. Water heater gas inputs* shall not exceed the following ratesas shown in Table 6.

NOTE: See Figure 5 while reviewing the following requirements.

8. Minimum chimney size shall conform to “NAT+NAT”columns for common vent capacity in Chapter 13 of NFPA54/ANSI Z223.1−2009 and CAN/CSA−B149.1 and .2−05 inCanada. The chimney sizing requirements in Table 7 wereextracted from these codes.

9. Permitted exceptions to −10° F (−23°C) minimum 99% winterdesign temperature and furnace connector diameters areprovided in Table 8. If Table 8 permits a furnace connectorsize that is smaller than the chimney adapter outlet, a tapereddecreaser is permitted at the chimney adapter outlet.


Table 6 Water Heater

VENT HEIGHTH

ft (m)

4� dia.Connector Rise R

ft (m)

Water Heater Maximum Input Rating inThousands of BTU per Hour

B S

6 (2)1 (.3)2 (.6)3 (.9)

405261

395261

8 (2.5)1 (.3)2 (.6)3 (.9)

415362

405262

10 (3)1 (.3)2 (.6)3 (.9)

425463

415362

15 (4.5)1 (.3)2 (.6)3 (.9)

445564

435463

20 (6)1 (.3)2 (.6)3 (.9)

465665

455564

30 (9)1 (.3)2 (.6)3 (.9)

485866

475765

50 (15)1 (.3)2 (.6)3 (.9)

516169

506068

100 (30)1 (.3)2 (.6)3 (.9)

506068

495967

B = Listed Type−B Double−Wall metal pipe.S = Single−Wall galvanized−steel pipe.

These rise requirements are based on NFGC and NSCNGPIC.

Table 7 Multiple Appliance Chimney Capacity

VENT HEIGHTH

ft (m)

MINIMUM INTERNAL AREA OF MASONRYCHIMNEY FLUE - SQ IN (SQ MM)

28(18064)

38(24516)

50(32258)

63(40645)

78(50322)

113(72903)

Combined Appliance Maximum Input Rating inThousands of Btu per Hour

NAT+NAT

NAT+NAT

NAT+NAT

NAT+NAT

NAT+NAT

NAT+NAT

6 (2) NP 103 143 188 246 NP

8 (2.5) NP 119 163 218 278 408

10 (3) NP 131 177 236 302 454

15 (4.5) 106 152 212 283 365 546

20 (6) 122 172 243 325 419 648

30 (9) 137 198 278 381 496 749

NP = Not Permitted

10. Manifolded common−vent connectors: See Fig. G.1(k) inNFPA 54/ANSI Z223.1−2009 in USA or Fig. C.9 inCAN/CSA−B149.1−05 in Canada. For chimney heights of 8′(2.4m) or more, Type−B manifolded common−ventconnectors with no elbows are permitted. The manifoldedcommon−vent connector diameter shall be 1″ (25mm) greaterthan required furnace vent connector size. The combinedhorizontal length of longest vent connector (furnace or waterheater) plus manifolded common−vent connector shall notexceed vent connector lateral specified in section A.6.Eachconnector is permitted up to 2 elbows. No exceptions fromTable 8 are permitted. The minimum winter designtemperature permitted with manifolded common−ventconnector is −10° F (−23° C).

Table 8 MINIMUM WINTER DESIGN TEMPERATURES - �F (�C)

FURNACEMODELSIZES

CHIMNEY CLAY TILE LINER NOMINAL SIZE OR INSIDE AREA - in. or sq. in. (mm or sq mm)

8 X 8 or 42.7 (203 x 203 or 27548) 8 X 12 or 63.6 (203 x 305 or 41032) 12 X 12 or 83.3 (305 x 305 or 53742)

Furnace Type-B Vent Connector Diameter - in.(mm)

6 (152) 5 (127) 4 (102 ) 6 (152) 5 (127) 4 (102) 7 (178) 6 (152) 5 (127)

Models N8MPN/L, *8MPN/L, *8MPT & *8MPV Note:T/C/H8MPT050B12 is NOT permitted with NAHA001DH

050 -10 (-23)�� -10 (-23) +5 (15)* -10 (-23)**,�� -10 (-23) -10 (-23)* NP NP NP

075 -10 (-23)�� -10 (-23)� NP -10 (-23)�� -10 (-23)� NP NP NP NP

100 -10 (-23)� NP NP -10 (-23)� NP NP NP NP NP

125 -10 (-23)*,�,�� NP NP -10 (-23)*,�� NP NP -10 (-23)�� -10 (-23)* NP

150 NP NP NP NP NP NP -10 (-23)� NP NP

NP = Not PermittedTemperatures in parentheses are Celsius temperatures.* Furnace connector rise shall be at least 3ft (.9m)� Chimney height shall be at least 10ft (3m). A higher chimney height is required, if the furnace installation instructions specify a higher chimney height.� Furnace connector rise shall be at least 2(.6m) and chimney height shall be at least 15 (5m)** 6″ x 5″ (152 x 127 mm) or 6″ x 4″ (152 x 102 mm) tapered furnace vent connector decreaser is permitted at chimney inlet opening. However, better

resistance to chimney condensation will result, if connector diameter is not reduced.�� 4″ x 3″ (102 x 76 mm) tapered water heater vent connector decreaser is permitted at chimney inlet opening. However, better resistance to chimney

condensation will result, if connector diameter is not reduced.�� Either ** or �� is permitted, but not both.

Installation Of Chimney Adapter1. Turn off gas supply at manual gas valve before turning off

electric power supply to furnace.2. Turn off electric power supply to furnace at disconnect switch.3. The chimney adapter must always be installed for vertical flow

of vent gas from bottom to top of chimney adapter.4. UPFLOW AND HORIZONTAL AIR−FLOW APPLICATIONS

NOT NEEDING STRAIGHT VENT PIPE INTERNAL TOFURNACE See Figure 1 to Figure 4. The chimney adapter

relief opening must be at least 2″ (50.8mm) above the furnacecasing and other adjacent surfaces. A field−supplied 0.0304″(0.7mm) minimum−thickness galvanized−steel flue extensionpipe and/or a flue elbow may be needed between the furnaceinducer flue−collar and the chimney adapter, if the furnaceinducer flue−collar does not extend far enough to directlyattach the chimney adapter to the flue collar with properclearance to relief opening. A flue extension pipe should be nolonger than needed to attach the chimney adapter to the fluecollar with proper clearance at relief opening.


UPFLOW (Figure 1)

KIT NO. NAHA001DH: Attach chimney adapter to furnace flueelbow with 2 sheet metal screws (field−supplied) through two1/8−−in. (3mm) holes at inlet (small end) of chimney adapter. (See(See Figure 2) If a 1/8−−in. (3 mm) hole at inlet is not accessible,

remove three screws that hold elbow to inducer, attach chimneyadapter to elbow, then reattach elbow to inducer.

KIT NO. NAHA002DH: Use same procedure as above, except astandard 4−in. dia. to 5−in. dia. (102 to 127 mm) vent pipe increaser(field−supplied) is required between furnace elbow and chimneyadapter.

Figure 1Chimney Adapter Secured to Upflow Furnace Collar with Flue extension Pipe and/or Elbow(as needed)

RIGHTLEFT

UPFLOW

25-24-24

IN ON

OFF

VENT

IN ON

OFF

VENT

IN ON

OFF

VENT

Figure 2 Chimney Adapter Secured to Upflow Furnace Flue Collar

(Sizes 50,000 − 100,000 Btuh Input)

Blocked VentShutoff Switch

Chimney AdapterOutlet for VentConnector

2 Screws 180° apart toSecure Chimney Adapterto Furnace Flue Collar

3rd Screws at 90°

Chimney Adapter Inlet and Furnace FlueCollar

(Sizes 125,000 & 150,000 Btuh Input)

4″ to 5″ (101.6 to 127mm)Vent Pipe Increaser onFlue Collar

Conduit2 Screws 180° apart toSecure Chimney Adapterto Furnace Flue Collar

Chimney AdapterOutlet for VentConnector

3rd Screws at 90° for Flue PipeIncreaser to Flue Collar

25-24-26

3 Screws 120° apart to Secure ChimneyAdapter Inlet to Flue Pipe Increaser

Blocked VentShutoff Switch

Conduit

HORIZONTAL AIRFLOW - Either Kit (Figure 3)Before installing the chimney adapter, rotate the venter assembly toexit the flue pipe to the left or right side of the furnace casing asdescribed in the “SIDE VENTING” section of the furnace InstallationInstructions.

KIT NO. NAHA001DH: Attach chimney adapter to furnace flueelbow with 2 sheet metal screws (field−supplied) through two1/8−−in. (3mm) holes at inlet (small end) of chimney adapter. (See(See Figure 2) If a 1/8−−in. (3 mm) hole at inlet is not accessible,remove three screws that hold elbow to inducer, attach chimneyadapter to elbow, then reattach elbow to inducer.

KIT NO. NAHA002DH: Use same procedure as NAHA001DH,except a standard 4−in. dia. to 5−in. dia. (102 to 127 mm) vent pipeincreaser (field−supplied) is required between furnace elbow andchimney adapter.

The chimney adapter relief opening must be at least 2″ (50.8mm)above the furnace casing and other adjacent surfaces.


Figure 3Chimney Adapter Secured to HorizontalFurnace Flue Collar with Flue ExtensionPipe

25-24-24

RIGHT

LEFT

IN

ON

OF

F

VENT

IN

ON

OF

F

V E NT

DOWNFLOW APPLICATIONS - Either Kit (Figure 4)DOWNFLOW AIR−FLOW APPLICATIONS HAVING A STRAIGHTVENT PIPE INTERNAL TO FURNACE

Before installing the chimney adapter, complete the installation of theflue pipe to exit the left or right side of the furnace casing as describedin the “DOWNFLOW VENTING” section of the furnace InstallationInstructions.

KIT NO. NAHA001DH: Complete installation of flue pipe (andelbows) to exit furnace casing. If downflow furnace flue pipe exitscasing through lower−left door opening, route the flue pipe throughan accessory vent guard external to the casing. Attach chimneyadapter to furnace flue where it exits the furnace casing or vent guardwith three sheet metal screws (field−supplied) through twofactory−punched 1/8−in. (3 mm)holes and a third fielded−drilled1/8−in. (3 mm) hole at inlet (small end) of chimney adapter. Third holeshould be 90� from other two holes.

KIT NO. NAHA002DH: Use same procedure as for NAHA001DH,except a standard 4−in. dia.−to−5−in. (102 to 127 mm) dia. vent pipeincreaser (field−supplied) is required between the furnace flue andthe chimney adapter.

Figure 4 Chimney Adapter Secured to DownflowFurnace Flue Pipe within Vent Guard

25-24-24

INON

OFF

VENT

5. Remove locknut from fitting on free end of electrical conduitattached to chimney adapter. Route wire ends through a 7/8″hole in furnace casing near the chimney adapter. Holes areprovided on left and right sides near front of furnace andtoward rear at supply air end of furnace. If the downflow VentPipe Shield is used, use a 7/8″ hole, on side toward rear offurnace and use tube clamp in kit to hold conduit against sideof furnace. Secure conduit to furnace hole with locknut. Routethe blue wires from the blocked vent shutoff switch (BVSS) ofchimney adapter to the area of the pressure switch(low−pressure switch on two−stage furnaces). Two metalwire−routing clips and three wire ties are included in the kit tosecure the blue extension wires away from hot surfaces,sharp edges, and rotating parts.

NOTE: For applications where the chimney adapter wire leads willnot reach the (low−) pressure switch, use the factory−suppliedextension wires between the BVSS leads and the (low−) pressureswitch.

6. See Figures 6 to 9 in kit instructions for wiring connections.Find furnace blue wires that connect to (low−) pressureswitch. Disconnect one blue wire with insulated female, 1/4″quick−connect terminal from (low−) pressure switch, andconnect this blue wire to blue wire from BVSS that hasinsulated, male, 1/4″ quick−connect terminal. Male andfemale 1/4″ terminals must be oriented so that insulators fittogether. Connect other chimney adapter BVSS blue wire topressure switch terminal from which blue wire wasdisconnected. Position blue wire so that they are directedaway from hot surfaces, sharp edges, and rotating parts. TheBVSS should be in series with the (low−)pressure switch.

7. No other wire connection changes should be made forchimney adapter. Be certain that no terminals can be shortedto other circuits or to any grounded parts.

8. Refer to Figure 5. Secure a Type−B draft hood connector totop of chimney adapter with 3 sheet metal screws(field−supplied). Install Type−B double−wall metal ventconnector from draft hood connector to chimney flue openingin accordance with Type−B vent pipe manufacturer’sInstallation Instructions. The horizontal portion of ventingsystem shall maintain a minimum of 1/4″ upward slope perlinear foot away from furnace, and shall be rigidly supportedevery 5′ or less with hangers and straps to ensure that therewill be no movement after installation. The connector shallconform to size, rise, and lateral requirements under ChimneyAdapter Application Requirements and Table 2 of theseinstructions.

Note: Do NOT use the NFPA 54/ANSI Z223.1 andCAN/CSA−B149.1 and .2 for vent connector SIZING requirements.

9. (Not required for single furnace, Appliance RequirementsSection B.)Complete installation of water heater Type−Bdouble−wall vent connector in same manner as used forfurnace connector, except that a chimney adapter is notrequired at Type−B draft hood connector for water heater.


Figure 5 Furnace & Water Heater Vent Connections, Chimney Adapter & Chimney

Tile Liner Size Inside

ChimneyAdapter

Draft Hood-Equipped Water Heater (Not Requiredfor Single Appliance)

VentConnector Rises

25-24-25

Furn

ace

Fan-AssistedFurnace

Connector HorizontalLengths

ChimneyHeight

Single Wallor Type-B(See Table 5)

Dia.

Dia.Wat

er H

eate

r

Nominal(Outside)

Clay Tile LinedMasonry Chimney

Start−up,Adjustment, And Safety Check1. With furnace blower operating,check for air leakage from

supply−air plenum or coil casing that could interfere withBVSS operation. If air leaks are found they must be properlysealed.

2. Complete Start−Up, Adjustment,and Safety Check in furnaceInstallation Instructions. Adjust furnace air temperature rise tobe near high end of air temperature rise range specified onfurnace rating plate (without exceeding high end of riserange). A higher air temperature rise reduces chimneycondensation. While doing furnace check,the following stepsshall be performed with each appliance that is connected tocommon−vented chimney. Put each appliance in operationwhile other appliance(s)are not in operation.

a. Inspect venting system for blockage or restriction, leakage,corrosion, and other deficiencies that could cause an unsafecondition.

b. Insofar as practical, close all building doors and windows, andall doors between space in which appliances are located andother spaces of building. Turn on clothes dryer and anyappliance not connected to this chimney flue. Turn on allexhaust fans such as range hoods and bathroom exhausts,sothey will operate at maximum speed. Do not operate asummer exhaust fan. Close fireplace dampers.

c. Follow operating instructions for each appliance beingchecked. Adjust each thermostat so appliance will operatecontinuously.

d. Test for vent gas spillage at water heater draft hood (whenapplicable) and at furnace chimney adapter relief openingsafter 5 minutes of main burner operation. Use the flame of amatch or candle.

e. Operate ALL appliances that are common−vent connected tochimney flue, and again test for vent gas spillage.

f. If improper venting is observed during any of above tests(e.g.,vent gas spillage at water heater draft hood or furnacechimney adapter, or leakage from vent system), thecommon−venting chimney system must be corrected.

g. After it has been determined that each appliance properlyvents when tested as outlined above, return doors, windows,exhaust fans, fireplace dampers, and any other gas−burningappliances to their previous conditions of use.

3. Check chimney adapter BVSS. The purpose of the BVSS is tocause safe shutdown of furnace, if furnace vent connector orchimney becomes blocked.

a. Disconnect power to furnace, and remove vent connector fromchimney adapter. Be sure to allow time for vent pipe to cooldown before handling pipe.

b. Restore power to furnace, and jumper R−to−W forsingle−stage furnace (or R−to−W1−and−W−2 for two−stagefurnaces) to operate furnace (high−fire for two−stagefurnaces).

c. After normal start−up,allow furnace to operate for two minutes,then block chimney adapter outlet 100%. Furnace should shutoff within 2 minutes. If shut−off does not occur, correct themalfunction and retest.

d. Remove jumper from R−to−W−1−and−W−2.

e. Remove blockage and reconnect vent connector to chimneyadapter.

f. Wait five minutes, then reset BVSS.

4. Leave Installation Instructions for chimney adapter and forfurnace near furnace.


Figure 6 Single Stage Models − N8MPL/N, *8MPL/N, *8DNL Furnace Wiring Diagram with Chimney Adapter


Figure 7 Two−Stage Models − *8MPT Furnace Wiring Diagram with Chimney Adapter


Figure 8 Two−Stage Variable Speed Models − *8MPV075, 100 & 125 Furnace Wiring Diagram with Chimney Adapter


Masonry Chimney Application RequirementsIf a clay tile−lined masonry chimney is being used and it is exposed tothe outdoors below the roof line, relining might be required.Chimneys shall conform to the Standard for Chimneys, Fireplaces,Vents, and Solid Fuel Burning Appliances NFPA 211−2006 in theUnited States and to a Provincial or Territorial Building Code inCanada (in its absence, the National Building Code of Canada) andmust be in good condition.

U.S.A.−Refer to NFPA 54/ANSI Z223.1−2009 or the authority havingjurisdiction to determine whether relining is required. If relining isrequired, use a properly sized listed metal liner, Type−B vent, or alisted alternative venting design.

NOTE: See the NFPA 54/ANSI Z223.1−2009 regarding alternativeventing design and the exception, which cover installations such asthe Chimney Adapter Kits NAHA001DH and NAHA002DH, whichare listed for use with these furnaces.

The Chimney Adapter Kit are listed alternative venting design forthese furnaces. See the kit instructions for complete details.

Canada (and U.S.A.)−This furnace is permitted to be vented into aclay tile−lined masonry chimney that is exposed to the outdoorsbelow the roof line, provided:

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

2. This furnace is common vented with at least one drafthood−equipped appliance, and

3. The combined appliance input rating is less than themaximum capacity given in Table 9A, and

4. The input rating of each space−heating appliance is greaterthan the minimum input rating given in Table 9B and

5. The authority having jurisdiction approves.

If all of these conditions cannot be met, an alternative venting designshall be used, such as the listed chimney adapter kit with a furnacelisted for use with the kit, a listed chimney−lining system, or a Type−Bvent.

If all the requirements of these instructions have been met, select thecorrect draft hood kit model from Table 4 and install per theseinstructions.

Exterior Masonry Chimney,FAN+NAT Installations with

Type−B Double−Wall Vent Connectors � NFPA & AGA

Table A-Combined Appliance

Maximum Input Rating inThousands of Btu per Hr

Table 9A Combined Appliance Maximum Input Rating inThousands of Btu per Hr

VENTHEIGHT

ft(m)

INTERNAL AREA OF CHIMNEYin.2 (mm2)

12(7742) 19(12258) 28(18064) 38(24516)6(1.8) 74 119 178 2578(2.4) 80 130 193 27910(3) 84 138 207 299

15(4.6) NR 152 233 33420(6.1) NR NR 250 36830(9.1) NR NR NR 404

Table B-Minimum Allowable Input Rating of

Space-Heating Appliance inThousands of Btu per Hr

Table 9B Minimum Allowable Input Rating of Space−HeatingAppliance in Thousands of Btu per Hr

VENTHEIGHT

ft (m)

INTERNAL AREA OF CHIMNEYin2 (mm2)

12(7742) 19(12258) 28(18064) 38(24516)

17 t

o 2

6�F

(−8

to

−3�

C) Local 99% Winter Design Temperature:

17 to 26°F (−8 to −3°C)*

6(1.8) 0 55 99 1418(2.4) 52 74 111 15410(3) NR 90 125 169

15(4.6) NR NR 167 21220(6.11) NR NR 212 25830(9.1) NR NR NR 362

5 t

o 1

6�F

(−1

5 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 377−1

0 to

4�F

(−2

3 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 foundin the 2005 ASHRAE Fundamentals Handbook CD andChapter 28.


Figure 9 Chimney Adapters

NAHA002DH

NAHA001DH

1/8″ Dia. Holes

73/4″

7″ Dia. Outlet

5″ Inlet

Reset Switch

6″ Dia. OutletReset Switch

83/4″

1/8″ Dia. Holes

4″ Inlet

25-24-39a

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