International comfort products N9mp1 User manual

Printed in U.S.A. 440 01 1024 04 Dec. 2010

INSTALLATION INSTRUCTIONS

90+ Single Stage, Category IV, Gas Furnace

N9MP1, N9MP2, N9MPD

C9MPD, H9MPD, T9MPD

(Upflow/Downflow/Horizontal)

These instructions must be read and understood completely before attempting installation.

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, and NOTE

The signal words DANGER, WARNING,

CAUTION,and NOTE are used to identify levels of

hazard seriousness. The signal word DANGER is

only used on product labels to signify an immediate

hazard. The signal words WARNING, CAUTION,

and NOTE will be used on product labels and

throughout this manual and other manual that may

apply to the product.

DANGER −Immediate hazards which will result in

severe personal injury or death.

WARNING −Hazards or unsafe practices which

could result in severe personal injury or death.

CAUTION −Hazards or unsafe practices which

may result in minor personal injury or product or

property damage.

NOTE −Used to highlight suggestions which will

result in enhanced installation, reliability, or

operation.

!WARNING

Signal Words in Manuals

The signal word CAUTION is used throughout

this manual in the following manner:

!CAUTION

Signal Words on Product Labeling

Signal words are used in combination with

colors and/or pictures or product labels.

The signal word WARNING is used throughout

this manual in the following manner:

Safety−alert symbol

When you see this symbol on the unit and in

instructions or manuals, be alert to the

potential for personal injury.

TABLE OF CONTENTS

Safety considerations 4...........................

Safe Installation Requirements 4...................

Installation 6.....................................

Combustion & Ventilation Air 10.....................

Vent and Combustion Air Piping 14..................

Concentric Termination 32..........................

Gas Supply and Piping 33..........................

Electrical Wiring 38................................

Ductwork and Filter 39.............................

Checks and Adjustments 42........................

Furnace Maintenance 45...........................

Sequence of Operation & Diagnostics 46.............

Technical Support 48..............................

International Comfort Products, LLC

Lewisburg, TN 37091 U.S.A.

www.icpusa.com

Use of the AHRI Certified TM Mark indicates a

manufacturer’s participation in the program.

For verification of certification for individual

products, go to www.ahridirectory.org .

!WARNING

PERSONAL INJURY, AND/OR PROPERTY

DAMAGE HAZARD

Failure to carefully read and follow this warning could

result in equipment malfunction, property damage,

personal injury and/or death.

Installation or repairs made by unqualified persons could

result in equipment malfunction, property damage,

personal injury and/or death.

The information contained in this manual is intended for

use by a qualified service technician familiar with safety

procedures and equipped with proper tools and test

instruments.

Installation must conform with local building codes and

with the Natural Fuel Gas Code (NFCG) NFPA 54/ANSI

Z223.1, and National standards of Canada

CAN/CSA−B149.1 and .2 Natural Gas and Propane

Installation Codes.

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 NFPA 54 /ANSI Z223.1−2009©, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington, DC

20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety.

440 01 1024 04 Specifications are subject to change without notice. 2

Required Notice for Massachusetts Installations

Important

The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows:

5.08: Modifications to NFPA−54, Chapter 10

2) Revise 10.8.3 by adding the following additional requirements:

(a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential

purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet

above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled equipment, the

installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back−up is installed on the floor

level where the gas equipment is to be installed. in addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired

carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall

horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified license

professionals for the installation of hard wired carbon monoxide detectors.

a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired carbon

monoxide detector with alarm and battery back−up may be installed on the next adjacent floor level.

b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of

thirty (30) days to comply with the above requirement; provided, however, that during said thirty (30) day period, a battery operated carbon

monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall

comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet

above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall

read, in print size no less than one−half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. INSPECTION. The state of local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless,

upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR

5.08(2)(a) 1 through 4.

(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54 as adopted by the

Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or

structure used in whole or in part for residential purposes.

(c) MANUFACTURER REQUIREMENTS −GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer of Product Approved side wall

horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by

the manufacturer for installation of the equipment and the venting system shall include:

1. Detailed instructions for the installation of the venting system design or the venting system components; and

2. A complete parts list for the venting system design or venting system.

(d) MANUFACTURER REQUIREMENTS −GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a Product Approved side

wall horizontally vented gas fueled equipment does not provide the parts for venting the flue gases, but identifies “special venting systems”, the

following requirements shall be satisfied by the manufacturer:

1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation instructions; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and detailed

installation instructions.

(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists

for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.

For questions regarding these requirements, please contact the Commonwealth of Massachusetts Board of State Examiners of Plumbers and Gas

Fitters, 239 Causeway Street, Boston, MA 02114. 617−727−9952

Specifications are subject to change without notice. 440 01 1024 04

START−UP CHECK SHEET

For 90+ 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

All Electrical Connections Tight?

Have hoses been relocated for furnace application

(upflow/horizontal)?

Condensate Drain Connected?

Condensate Drain Trapped?

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

Which blower speed tap is used? (Heating)

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:

4 440 01 1024 04

Specifications are subject to change without notice

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, and the 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.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal

injury or death.

Before performing service or maintenance operations

on unit, always turn off main power switch to unit and

install lockout tag. Unit may have more than one

power switch.

!WARNING

CARBON MONOXIDE POISONING AND FIRE

HAZARD

Failure to follow safety warnings could result in

personal injury, death, and/or property damage.

This furnace is not designed for use in mobile homes,

trailers or recreational vehicles.

!WARNING

CUT HAZARD

Failure to follow this caution may result in damage

personal injury.

Sheet metal parts may have sharp edges or burrs.

Use care and wear appropriate protective clothing,

safety glasses and gloves when handling parts and

servicing furnaces.

CAUTION

Safe Installation Requirements

FIRE, EXPLOSION, AND ASPHYXIATION HAZARD

Improper adjustment, alteration, service,

maintenance 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 “Vent and Combustion Air Piping” 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.

440 01 1024 04

Specifications are subject to change without notice

•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 technician 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

Failure to follow this caution may 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.

!CAUTION

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.

Winter Shutdown

If you go away during the winter months and do not leave the heat

on in your home, the plastic transition box and the condensate trap

on the furnace must be protected from freeze damage.(See

Figure 11 trough Figure 20)

1. Disconnect the 5/8″(15.9mm) OD rubber hose from the vent

drain fitting that is located downstream of the combustion

blower. Insert a funnel into the hose and pour four(4) ounces

of sanitary type (RV) antifreeze into the condensate trap.

Reconnect the 5/8″(15.9mm) OD rubber hose to the stub on

the vent drain fitting. Secure with the hose clamp.

2. Disconnect the 3/4″(15.9mm)OD rubber hose from the

condensate trap. Insert a funnel into the hose and and pour

four(4) ounces of sanitary type (RV) antifreeze into the

plastic Transition box. Squeeze the hose together near the

end and quickly reconnect the 3/4″(19.1mm) OD rubber

hose to the stub on the condensate trap. Secure with the

hose clamp.

When you return home, your furnace will be ready to start, as it is

not necessary to drain the antifreeze from the furnace.

6 440 01 1024 04

Specifications are subject to change without notice

Installation

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in

personal injury or death.

This furnace can NOT be common vented or

connected to any type B, BW or L vent or vent

connector, nor to any portion of a factory−built or

masonry chimney. If this furnace is replacing a

previously common-vented furnace, it may be

necessary to resize the existing vent and chimney to

prevent oversizing problems for the other

remaining appliance(s). See Venting and Combus-

tion Air Check in Gas Vent Installation section.This

furnace MUST be vented to the outside.

!WARNING

Location and Clearances

1. Refer to Figure 1 or Figure 2 for typical installation and

basic connecting parts required. Refer to Figure 5 for

typical horizontal direct vent installation and basic

connecting parts required. Supply and return air plenums

and duct are also required.

2. 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 3).

Figure 1 Typical Upflow Installation

Vent Pipes MUST be

supported

Horizontally and

Vertically

*8″(203.2mm) Min.

20′(6.1m) Max.

in same atmospheric zone

*8″(203.2mm) Min.

20′(6.1m) Max.

in same

atmospheric

zone

Coupling on ends of

exhaust pipe. Total

pipe & coupling out

side structure = 8″

(203.2mm)

Aluminum or non-rusting shield recommended. (See Vent

Termination Shielding for dimensions).

* Increase minimum from 8(203.2mm) to 18 (457.2mm) for cold climates (sus

tained temperatures 0F (-17C) and below for 24 or more consecutive hours).

DISCHARGE AIR

25−23−33

Inlet Pipe

(not used on

Single Pipe

model)

Figure 2 Typical Downflow Installation

*8″(203.2mm) Min.

20′(6.1m) Max. in

same atmospheric zone

Vent Pipes MUST

be supported Hori

zontally and Vertically

* Increase minimum from 8(203.2mm) to 18 (457.2mm) for cold climates (sus

tained temperatures 0F (-17C) and below for 24 or more consecutive hours).

See Vent Termination

Shielding in Vent Section.

*8″(203.2mm) Min.

20′(6.1m) Max.

in same

atmospheric zone

8″Min.

Coupling on inside

and outside of wall to

restrain vent pipe

25−23−33a

Inlet Pipe

(not used on

Single Pipe

model)

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 shorten furnace life.

Refer to Combustion & Ventilation Air section,

Contaminated Combustion Air for combustion air

evaluation and remedy.

!WARNING

FROZEN AND BURST WATER PIPE HAZARD

Failure to follow this caution may result in property

damage.

Special precautions MUST be made if installing

furnace in an area which may drop below freezing.

This can cause improper operation or damage to

equipment. If furnace environment has the potential

of freezing, the drain trap and drainline must be

protected. The use of electric heat tape or RV

antifreeze is recommended for these installations.

(See “Condensate Trap Freeze Protection Section”)

!CAUTION

Do NOT operate furnace in a corrosive atmosphere

containing chlorine, fluorine or any other damaging

chemicals. Refer to Combustion & Ventilation Air section,

Contaminated Combustion Air.

440 01 1024 04

Specifications are subject to change without notice

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 the vent pipes as short as practical. (See Gas Vent

Installation section).

4. Do NOT install furnace directly on carpeting, tile or other

combustible material other than wood flooring.

5. Maintain clearance for fire safety and servicing. A front

clearance of 24″(609.6mm) required and 30″(762mm)

recommended for access to the burner, controls and filter.

See clearance requirements in Figure 3.

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

7. 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.

8. 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 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.

9. Local codes may require a drain pan under the entire furnace

and condensate trap when the furnace is installed in attic

application.

This furnace may be used for construction heat provided that all

the following conditions are met:

•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.

•After construction is complete, verify furnace operating

conditions including ignition, input rate, temperature rise

and venting according to these instructions.

215/8

25−23−36b

Figure 3 Dimensions & Clearances

TOP

AIR INTAKE

VENT (N9MPD & *9MPD)

FRONT

DBOTTOM

37/8

231/823/8

AIR INTAKE (KO)

(ALTERNATE)

RIGHT SIDE

TRAP (COUNTERFLOW)

ELECTRICAL (KO)

VENT (KO)

TRAP (KO)

UPFLOW/HORIZONTAL

THERMOSTAT

11/4

27/8

281/2

181/2

3/4

(19)

TYP.

45/16

11/16

GAS

413/16

111/16

175/16

111/16

273/16

297/8

215/8

3311/16

17/8

913/16

13/16

47/8

21/4

191/4

ALL DIMENSIONS −IN(MM)

1 in = 25.4 mm

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.

Furnace is designed for bottom return or side

return.

Return air through back of furnace is NOT allowed.

* Denotes Brand

^^ Cooling Air Flow

(KO)

KO = KnockOut

(31.7)

(73)

AIR INTAKE (KO)

(ALTERNATE)

LEFT SIDE

VENT

21/4

ELECTRICAL

413/16

11/16

111/16

175/16

241/16

283/4

297/8

TRAP (KO)

UPFLOW/HORIZONTAL

17/8

215/8

131/4

47/8

TRAP (KO) (COUNTERFLOW)

3111/16

13/8

THERMOSTAT

GAS

(KO)

(177.8)

(34.9)

(503.2)

(347.7)

(804.9)

(758.8)

(730.3)

(611.2)

(439.7)

(42.9)

(123.8)

(609.6)

(549.3)

(47.6)

(336.6)

(57.2)

(122.2)

(27)

(32)

(177.5)

611/16

11/4

1311/16

1913/16

(587.4) (98.4)

(724)

(470)

(110)

(30)

(251)

(856)

(759)

(691)

(549)

(440)

(43)

(57)

(489)

(1016)

(124)

(610)

(549) (48)

(178)

(60)

(27)

(122)

8 440 01 1024 04

Specifications are subject to change without notice

MINIMUM CLEARANCES TO

COMBUSTIBLE MATERIALS FOR ALL UNITS

REAR 0

FRONT (combustion air openings

in furnace and in structure)

3″(76.2)

Required For Service *24″(609.6)

ALL SIDES Of SUPPLY PLENUM 1″(25.4)

SIDES 0

VENT 0

TOP OF FURNACE 1″(25.4)

*30″(762mm) 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.

Unit

Capacity

Cabinet Bottom Top

A B CD E F G H

N9MP1040/050B^^ 151/2

(394)

(356)

13/8

(35)

125/8

(321) -- -- -- --

N9MP1060/075B^^ 151/2

(394)

(356)

13/8

(35)

125/8

(321) -- -- -- --

N9MP1080/100F^^ 191/8

(486)

175/8

(448)

21/8

(54)

143/4

(375) -- -- -- --

N9MP1100/125J^^ 223/4

(578)

211/4

(540)

115/16

(49)

183/4

(476) -- -- -- --

N9MP2050/075B^^ 151/2

(394)

(356)

13/8

(35)

125/8

(321) -- 41/2

(114) -- 73/4

(197)

N9MP2080/100F^^ 191/8

(486)

175/8

(448)

21/8

(54)

143/4

(375) -- 41/2

(114) -- 91/2

(241)

N9MP2100/125J^^ 223/4

(578)

211/4

(540)

115/16

(49)

183/4

(476) -- 41/2

(114) -- 113/8

(289)

N9MPD040/050F^^ 191/8

(486)

175/8

(448)

21/8

(54)

143/4

(375)

43/8

(111)

41/2

(114)

21/2

(64)

91/2

(241)

N9MPD060/075F^^ 191/8

(486)

175/8

(448)

21/8

(54)

143/4

(375)

43/8

(111)

41/2

(114)

21/2

(64)

91/2

(241)

N9MPD080/100J^^ 223/4

(578)

211/4

(540)

115/16

(49)

183/4

(476)

43/8

(111)

41/2

(114)

25/8

(67)

113/8

(289)

N9MPD125L^^ 241/2

(622)

(584)

7/16

(11)

(584)

43/8

(111)

41/2

(114)

21/4

(57)

121/4

(311)

*9MPD050/075F^^ 191/8

(486)

175/8

(448)

21/8

(54)

143/4

(375)

43/8

(111)

41/2

(114)

21/2

(64)

91/2

(241)

*9MPD080/100J^^ 223/4

(578)

211/4

(540)

115/16

(49)

183/4

(476)

43/8

(111)

41/2

(114)

25/8

(67)

113/8

(289)

*9MPD125L^^ 241/2

(622)

(584)

7/16

(11)

(584)

43/8

(111)

41/2

(114)

21/4

(57)

121/4

(311)

440 01 1024 04

Specifications are subject to change without notice

Knock Outs

CUT HAZARD

Failure to follow this caution may result in personal

injury.

Sheet metal parts may have sharp edges or burrs.

Use care and wear appropriate clothing, safety

glasses and gloves when handling parts and

servicing furnaces.

!CAUTION

Use a hammer and screwdriver to strike a sharp blow (See

Figure 4) directly to the knockout tie points or use a hammer in the

upper left corner of the desired knockout. Remove any burrs and

sharp edges.

Hammer and Screwdriver used

for Knockout

Figure 4

25−40−06

NOTE: If a knockout does not come out after two sharp blows, pull

and snip as needed to remove the knockout.

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 Considerations

The installation of the furnace for a given application will dictate the

position of the furnace, the airflow, ductwork connections, vent and

combustion air piping. Consideration must be given to the

following:

Condensate Trap and Drain Lines

The supplied condensate trap must be attached to the furnace

side panel on either the left or right side. For horizontal

installations, the drain trap is vertically attached to the side panel

below the furnace. A minimum clearance of 6″(152.4mm) below

the furnace is required for the condensate trap. Downward slope of

the condensate drain line from the condensate trap to the drain

location must be provided. Adequate freeze protection of the drain

trap and the drain line must be provided. See “Condensate Drain

Trap” section for further details.

Leveling

Proper leveling of the furnace must be provided to insure proper

drainage of the condensate from the furnace. The furnace must be

level to within 1/4″(6.4mm) from front to back and from side to side

for upflow and downflow installations or top to bottom for horizontal

installations.

Vent and Combustion Air Connections

For venting information literature, call 931.270.4100 with the

complete model and serial number of the furnace.

Special Venting Requirements for Installations in Canada

Installation in Canada must conform to the requirements of CSA

B149 code. Vent systems must be composed of pipe, fittings,

cements, and primers listed to ULC S636. The special vent fittings

and accessory concentric vent termination kits and accessory

external drain trap have been certified to ULC S636 for use with

those Royal Pipe and IPEX PVC vent components which have

been certified to this standard. In Canada, the primer and cement

must be of the same manufacturer as the vent system – GVS-65

Primer (Purple) for Royal Pipe or IPEX System 636, PVC/CPVC

Primer, Purple Violet for Flue Gas Venting and GVS-65 PVC

Solvent Cement for Royal Pipe or IPEX System 636(1)

t, PVC

Cement for Flue Gas Venting, rated Class IIA, 65 deg C. must be

used with this venting system - do not mix primers and cements

from one manufacturer with a vent system from a different

manufacturer. Follow the manufacturer’s instructions in the use of

primer and cement and never use primer or cement beyond its

expiration date.

The safe operation, as defined by ULC S636, of the vent system is

based on following these installation instructions, the vent system

manufacturer’s installation instructions, and proper use of primer

and cement. All fire stop and roof flashing used with this system

must be UL listed material. Acceptability under Canadian

standard CSA B149 is dependent upon full compliance with all

installation instructions. Under this standard, it is recommended

that the vent system be checked once a year by qualified service

personnel.

The authority having jurisdiction (gas inspection authority,

municipal building department, fire department, etc) should be

consulted before installation to determine the need to obtain a

permit.

(1) System 636 is a trademark of IPEX Inc.

Consignes spéciales pour l’installation de ventillation au

Canada

L’installation faite au Canada doit se conformer aux exigences du

code CSA B149. Ce systême de ventillation doit se composer de

tuyaux, raccords, ciments et apprêts conformes au ULC S636. La

tuyauterie de ventillation des gaz, ses accessoires, le terminal

concentrique mural ainsi que l’ensemble du drain de condensat

extérieur ont été certifiés ULCS 636 pour l’application des

composantes Royal Pipe, IPEX PVC qui sont certifiées à ce

standard. Au Canada, l’apprêt et le ciment doivent être du même

fabricant que le système d’évacuation. L’apprêt GVS-65 (Purple)

et le ciment-solvant GVS-65 doivent être utilisé avec les Royal

Pipe. Système IPEX 636, apprêt PVC/CPVC, Purple pour

évacuation des gaz de combustion et système IPEX 636(1)t,

ciment PVC pour évacuation des gaz de combustion, coté classe

IIA, 65 deg C. doivent être utilisés avec le système d’évacuation

IPEX 636 – Ne pas combiner l’apprêt et le ciment d’un

manufacturier avec un système d’évacuation d’un manufacturier

différent.

Bien suivre les indications du manufacturier lors de l’utilisation de

l’apprêt et du ciment et ne pas utiliser ceux-ci si la date d’expiration

est atteinte.

L’opération sécuritaire, tel que définit par ULC S636, du système

de ventilation est basé sur les instructions d’installation suivantes,

ainsi que l’usage approprié de l’apprêt et ciment. Tout arrët feu et

solin de toit utilisés avec ce système doivent être des matériaux

listés UL. L’acceptation du standard Canadien CSA B419 est

directement relié à l’installation conforme aux instructions ci- haut

10 440 01 1024 04

Specifications are subject to change without notice

mentionnées. Le standard Canadien recommande l’inspection

par un personel qualifié et ce, une fois par année.

Les autoritées ayant juridiction (inspecteurs de gas, inspecteurs

en bâtiments, département des incendies, etc) devraient être

consultées avant l’installation afin de déterminer si un permis est

requis.

On the N9MPD or *9MPD furnace, the vent and combustion air

pipes attach to the furnace through the top panel for the upflow and

horizontal installations. For the downflow installation, the vent and

combustion air pipes attach to the furnace through the alternate

locations on the furnace side panels.

Note: On the N9MP2 furnace, the vent pipe attaches to the furnace

through the side panels. The combustion air pipe attaches to the

top panel or to the alternate location on the side panel.

On the Single Pipe furnace, the vent pipe attaches to the furnace

through the furnace side panels.

Note: Repositioning of the combustion blower is required for the

vent pipe connection to the furnace through the “right side” panel.

See “Vent and Combustion Air Piping” section for further details.

Horizontal Furnace Installation

This furnace can be installed horizontally in an attic, basement,

crawl space, alcove, or suspended from a ceiling in a basement or

utility room . See Figure 5. Do not install furnace on its back or in

the reverse airflow positions as safety control operation will be

adversely affected.

If the furnace is to be installed in a crawl space, consult local

codes. A suitable concrete pad or blocks are recommended for

crawl space installation on the ground.

NOTE: 6″(152.4mm) bottom clearance required for condensate

trap.

24″(609.6mm) between the front of the furnace and adjacent

construction or other appliances MUST be maintained for service

clearance. 30″(762mm) inches is required to remove furnace.

Inlet Pipe (not used on Single Pipe model)

Typical Horizontal Installation

Attic

Figure 5

Vent

Pipe

Condensate

Trap

NOTE: 6(152.4mm)bottom clearance required for condensate trap.

Auxiliary drain pan is required if over a finished living space.

25−23−34

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 as long as all required furnace

clearances are met. See Figure 5.

This furnace MUST NOT be installed directly on carpeting or tile or

other combustible material other than wood flooring or supports.

For horizontal installation over a finished living space. A field

fabricated auxiliary drain pan with drain pipe is required to prevent

damage by overflow due to blocked condensate drain.

Combustion & Ventilation Air

For Single Pipe Installation

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in

personal injury or death.

Provide adequate combustion and ventilation air.

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. 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.

This furnace can NOT be common vented or connected to any

type B, BW or L vent or vent connector, nor to any portion of a

factory−built or masonry chimney. Multistory venting is NOT

permitted. If this furnace is replacing a previously common-vented

furnace, it may be necessary to resize the existing vent and

chimney to prevent oversizing problems for the other remaining

appliance(s). See “Venting and Combustion Air Check” in this

section.This furnace MUST be vented to the outside.

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.

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 1/4″(6.4mm) mesh.

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

3″(76.2mm).

440 01 1024 04

Specifications are subject to change without notice

5. When sizing a grille, louver, or screen use the free area of

opening. If free area is NOT stamped or marked on grill or

louver, assume a 20% free area for wood and 60% for metal.

Screens shall have a mesh size not smaller than 1/4″(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.

2. Figure 6 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.

Minimum One Inlet and One Outlet Air Supply is Required

May be in any Combination Shown

Inlet Air Opening must be within 12″(304.8mm) of floor

Outlet Air Opening must be within 12″(304.8mm) 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.)

Figure 6

This installation NOT approved in Canada

ÁÁÁÁÁÁÁÁÁ

ÉÉ

ÂÂÂÂÂÂÂÂÂ

Gas Vent

Gable Vent

Ventilated Attic

Top Above Insulation

alternate Inlet Air (1)

Ventilated Crawl Space

Outlet Air (1) Soffit Vent

ÂÂÂÂÂÂÂÂÂ

Outlet

Air (1)

Inlet

Air (1)

Outlet

Air (2)

Inlet

Air (2)

Gas Vent

Inlet

Air (2)

Soffit Vent

ÉÉ

ÂÂÂÂÂÂÂÂÂ

ÉÉ

Gas Vent

Gable Vent

Ventilated Attic

Top Above Insulation

Inlet

Air (1)

OutletAir (1)

alternate Inlet Air (1)

c. Horizontal duct openings require 1 square inch of free

area per 2,000 BTUH (11 cm2/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 cm2/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 cm2/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.

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.

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 cm2/.09)

Single Opening

BTUH (kW)

sq. in./3,000 (1 cm2/.135)

Two Vertical Ducts or Openings

BTUH (kW)

sq. in./4,000(1 cm2/.18)

Round Duct

BTUH (kW)

sq. in./4,000(6.5cm2/.18)

40,000 (11.72) 20 sq. in. (129 cm2)13.34 sq. in. (86 cm2)10 sq. in. (65 cm2) 4″(101.6mm)

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

60,000 (17.58) 30 sq. in. (194 cm2)20 sq. in. (129 cm2)15 sq. in. (97 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)

80,000 (23.45) 40 sq. in. (258 cm2)26.7 sq. in. (172 cm2)20 sq. in. (129 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)

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 cm2Vertical

= 65 Sq. In. Horizontal

= 423 cm2Horizontal

12 440 01 1024 04

Specifications are subject to change without notice

Indoor Combustion Air

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 (4.8 cubic

meters per kW) input rating or homes with tight

construction may need outdoor air, supplied

through ducts, to supplement air infiltration for

proper combustion and ventilation of flue gases.

WARNING

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.

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) input rating 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.

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in

personal injury or death.

An unconfined space or homes with tight

construction may not have adequate air infiltration

for proper combustion and ventilation of flue gases.

Most homes will require additional air.

!WARNING

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

(8,790 kW)

40,000 BTU

(11,720 kW)

50,000 BTU

(14,650 kW)

50,000 BTU

(14,650 kW)

75,000 BTU

(21,975 kW)

100,000 BTU

(29,300 kW)

125,000 BTU

(36,625 kW)

ft3(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)

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)

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)

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)

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)

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)

0.00 NP NP NP NP NP NP NP

ACH = Air Changes per Hour

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 appliances other than fan−assisted appliances (such

as a draft hood−equipped water heater), calculate using the

following equation:

1000 BTUH

21 ft3(I other )

Required Volume other ACH

.293 kW

59 m3(I other )

Required Volume other ACH

2. For fan−assisted appliances (such as this furnace),

calculate using the following equation:

1000 BTUH

15 ft3(I fan )

Required Volume fan  ACH

.293 kW

.42 m3(I fan )

Required Volume fan  ACH

where:

Iother = all appliances other than fan−assisted input in BTUH

Ifan = fan−assisted appliance input in BTUH

ACH = air change per hour (percent of volume of space

exchanged per hour, expressed as a decimal)

3. For purposes of this calculation, an infiltration rate greater

than 0.60 ACH shall not be used in the equations above.

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.

•Combining spaces on the same story. Each opening shall

have a minimum free area of at least 1 in.2/1,000 BTUH (22

cm2/kW) of the total input rating of all appliances in the space

but not less than 100 in.2(645 cm2). One opening shall

commence within 12 in. (304.8 mm) of the top, and one

opening shall commence within 12 in. (304.8 mm) of the

bottom, of the enclosure. The minimum dimension of air

openings shall not be less than 3 in (76.2 mm).

•Combining spaces in different stories. The volumes of spaces

on different stories shall be considered as communicating

spaces where such spaces are connected by one or more

440 01 1024 04

Specifications are subject to change without notice

openings in doors or floors having a total minimum free area

of 2 in.2/1,000 BTUH (44 cm2/kW) of total input rating of all

appliances.

•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 cm2/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

replacement air. Whichever method is used, the mixed return air

temperature across the heat exchanger MUST not fall below 60°

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.

Venting and Combustion Air Check

Vent Check

Draft Hood

Vent Pipe

Match

Typical Gas

Water Heater

Figure 7

If flame pulls towards draft hood, this indicates sufficient

venting.

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.

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 burn-

er operation. Use the flame of a match or candle.

(Figure 7)

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

For Two Pipe Installation

This furnace can NOT be common vented or connected to any

type B, BW or L vent or vent connector, nor to any portion of a

factory−built or masonry chimney. If this furnace is replacing a

previously common-vented furnace, it may be necessary to resize

the existing vent and chimney to prevent oversizing problems for

the other remaining appliance(s). See “Venting and Combustion

Air Check” in this section.This furnace MUST be vented to the

outside.

14 440 01 1024 04

Specifications are subject to change without notice

Vent and Combustion Air Piping

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

Single Pipe (N9MP1 Models)

This furnace is certified as a Category IV appliance. This furnace

requires ventilation openings to provide 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 absence of local codes, the applicable national codes.

When the installation is complete, see the “Venting and

Combustion Air Check” in this manual.

Dual Certified (N9MP2, N9MPD and *9MPD

Models)

This furnace is certified as a Category IV appliance. This furnace

can be installed as a direct vent furnace using outside air for

combustion or the furnace can use air from inside the structure for

combustion. The INLET air pipe is optional. If combustion air

comes from inside the structure, adequate make up air MUST be

provided to compensate for oxygen burned. See Confined Space

Installation in the Combustion and Ventilation Air chapter. If

combustion air is drawn from outside the structure, it MUST be

taken from the same atmospheric pressure zone as the vent pipe.

Contaminated Combustion Air

Installations in certain areas or types of structures will increase the

exposure to chemicals or halogens that may harm the furnace.

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 outside 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.

Vent and Combustion Air Piping Guidelines

This furnace is approved for venting with Schedule 40 PVC,

CPVC, ABS fittings, and Cellular Core and SDR−26 PVC pipe.

Applicable ASTM Standards for Vent Materials

Materials Sch. 40

Pipe

SDR

Pipe

Cell

Core

Pipe

Fittings Primer Solv.

Cement

ABS D1527 __ F628

D2468

D2661

−− D2235

PVC D1785 D2241 F891

D2466

D2665

F656 D2564

CPVC F441 F442 −− F438 −− F493

ABS to

PVC −− −− −− −− −− D3138

NOTE: 1) In Canada, all pipe, fittings & cements must conform to

applicable CSA standards or to local codes having jurisdiction.

2) Only use solvent cements that are marked for use with

the specific venting material.

3) ABS to PVC transition joints REQUIRE a special

solvent cement that meets the requirements of ASTM D3138.

4) Refer to ASTM D2855 for general procedure to use for

cementing plastic pipe and fittings.

NOTE: In order to create a seal that allows future removal of pipe,

RTV sealant MUST be used on the inlet pipe where it joins to the

furnace.

NOTE: All vent piping MUST be installed in compliance with local

codes or ordinances, these instructions, good trade practices, and

codes of country having jurisdiction.

1. Determine the best routing and termination for the vent pipe

and air inlet pipe by referring to all of the instructions and

guidelines in this Section.

2. Determine the size required for the vent pipe and air inlet

pipe.

3. Loosely assemble all venting parts without adhesive (pipe

joint cement) for correct fit before final assembly.

4. Furnace shall be installed so as to prevent the accumulation

of condensate.

5. Use of vertical piping is preferred because there will be

some moisture in the flue gases that may condense as it

leaves the vent pipe (See Instruction For Horizontal Vents).

6. The vertical vent pipe MUST be supported so that no weight

is allowed to rest on the combustion blower.

7. Exhaust vent piping or air inlet piping diameter MUST NOT

be reduced.

8. All exhaust vent piping from the furnace to termination

MUST slope upwards. A minimum of 1/4″per foot per

(6.4mm per 304.8mm) of run is required to properly return

condensate to the furnace drain system.

9. Use DWV type long radius elbows whenever possible, as

they provide for the minimum slope on horizontal runs and

they provide less resistance in the vent system. If DWV

elbows cannot be used, use two, 45°elbows when possible.

On horizontal runs the elbows can be slightly misaligned to

provide the correct slope.

10. All horizontal pipe runs MUST be supported at least every

five feet with galvanized strap or other rust resistant

material. NO sags or dips are permitted.

440 01 1024 04

Specifications are subject to change without notice

11. All vertical pipe runs MUST be supported every six feet

(1.8m) where accessible.

12. The minimum vent length is 5′(1.5m) of PVC.

13. The piping can be run in the same chase or adjacent to

supply or vent pipe for water supply or waste plumbing. It

can also be run in the same chase with a vent from another

90+ furnace.

NOTE: In NO case can the piping be run in a chase where

temperatures can exceed 140°F(60°C). or where radiated

heat from adjacent surfaces would exceed 140°F(60°C).

14. The vent outlet MUST be installed to terminate in the same

atmospheric pressure zone as the combustion air inlet.

15. The vent system can be installed in an existing unused

chimney provided that:

•Both the exhaust vent and air intake run the length of the

chimney.

•No other gas fired appliance or fireplace (solid fuel) is

vented into the chimney.

•The top of the chimney MUST be sealed flush or crowned

up to seal against rain or melting snow so ONLY the piping

protrudes.

•The termination clearances shown in Figure 8 & Figure 9

are maintained.

16. Furnace applications with vertical vents requiring vent

diameter increaser fittings must have increaser fittings

installed in vertical portion of the vent. Condensate will be

trapped in the vent if the vent diameter is increased prior to

having an elbow turned upward. This could cause nuisance

tripping of the pressure switch.

Combustion Air and Vent Piping Insulation

Guidelines

NOTE: Use closed cell, neoprene insulation or equivalent. If

Fiberglass or equivalent insulation is used it must have a vapor

barrier. Use R values of 7 up to 10′(3.1m), R−11 if exposure

exceeds 10′(3.1m). If Fiberglass insulation is used, exterior to the

structure, the pipe MUST be boxed in and sealed against

moisture.

1. When the vent or combustion air pipe height above the roof

exceeds 30″(762mm) or if an exterior vertical riser is used

on a horizontal vent to get above snow levels, the exterior

portion MUST be insulated.

2. When combustion air inlet piping is installed above a

suspended ceiling, the pipe MUST be insulated with

moisture resistant insulation such as Armaflex or other

equivalent type of insulation.

3. Insulate combustion air inlet piping when run in warm,

humid spaces.

Sizing Combustion Air and Vent Pipe

Consult Table 3 or Table 4 to select the proper diameter exhaust

and combustion air piping. Exhaust and combustion air piping is

sized for each furnace Btuh size based on total linear vent length

(on inlet or outlet side), and number of 90°elbows required. Two

45°elbows can be substituted for one 90°elbow. The elbow or

elbows used for vent termination outside the structure ARE

counted, including elbows needed to bring termination above

expected snow levels. The elbow inside the furnace on the

N9MPD and *9MPD IS NOT included in the count.

Table 3 Pipe Diameter Table

N9MP1, N9MPD & *9MPD Models

40,000, 50,000, 60,000, 75,000 & 80,000 Btuh Furnaces

40′(12.2m) & (5) 90°elbows with 2″(50.8mm) PVC pipe or

70′& (5) 90°elbows with 3″(76.2mm) PVC pipe

100,000 Btuh Furnace

40′(12.2m) & (5) 90°elbows with 3″(76.2mm) PVC pipe or

70′& (5) 90°elbows with 3″(76.2mm) PVC pipe &

Long Vent Kit (See Tech. Manual)

125,000 Btuh Furnace

40′& (5) 90°elbows with 3″(76.2mm) PVC pipe

The minimum vent length is 5(1.5m) of PVC. Elbows are DWV

Long Radius Type for 2″(50.8mm) and 3″(76.2mm) vents.

If more than five elbows are required, REDUCE the length of

both the inlet and exhaust pipes 5′(1.5m) for each additional

elbow used. If less than five elbow are required, the length

can be INCREASED by 5′(1.5m) for each additional elbow

NOT used.

NOTE: It is allowable to use larger diameter pipe and fitting than

shown in the tables but not smaller diameters than shown.

Table 4 Pipe Diameter Table

N9MP2 Models

50,000 & 80,000 Btuh Furnaces

40′(12.2m) & (5) 90°elbows with 2″(50.8mm) PVC pipe or

70′(21.3m) & (5) 90°elbows with 3″(76.2mm) PVC pipe

75,000 Btuh Furnaces

25′& (3) 90°elbows with 2″(50.8mm) PVC pipe or

40′(12.2m) & (5) 90°elbows with 2″(50.8mm) PVC pipe &

Long Vent Kit (See Tech. Manual) or

70′(21.3m) & (5) 90°elbows with 3″(76.2mm) PVC pipe

100,000 Btuh Furnace

40′(12.2m) & (5) 90°elbows with 3″(76.2mm) PVC pipe or

70′(21.3m) & (5) 90°elbows with 3″(76.2mm)PVC pipe &

Long Vent Kit (See Tech. Manual)

125,000 Btuh Furnace

40′(12.2m) & (5) 90°elbows with 3″(76.2mm) PVC pipe

The minimum vent length is 5(1.5m) of PVC. Elbows are DWV

Long Radius Type for 2″(50.8mm) and 3″(76.2mm) vents.

If more than five elbows are required, REDUCE the length of

both the inlet and exhaust pipes 5′(1.5m) for each additional

elbow used. If less than five elbows are required, the length

can be INCREASED by 5′(1.5m) for each additional elbow

NOT used.

NOTE: It is allowable to use larger diameter pipe and fitting than

shown in the tables but not smaller diameters than shown.

For concentric vent pipe diameter see Concentric

Termination tables in this manual.

Vent Termination Clearances

CARBON MONOXIDE POISONING.

Failure to follow this warning could result in

personal injury or death.

Inlet and outlet pipes may NOT be vented directly

above each other.

!WARNING

1. Determine termination locations based on clearances

specified in following steps and as shown in Figure 8,

Figure 9, Figure 22, through Figure 24.

For concentric vent termination clearances, refer to

Concentric Termination Kit instructions.

2. For Single Pipe Installation, models N9MP1, N9MP2,

N9MPD or *9MPD, refer to Figure 9 for vent termination

clearances.

3. For Direct Vent Installation, models N9MP2, N9MPD or

*9MPD, refer to Figure 8 for vent termination clearances.

16 440 01 1024 04

Specifications are subject to change without notice

Figure 8 Direct Vent Termination Clearance

Item Clearance Description Canadian Installation (1) U.S. Installation (2)

AClearance above grade, veranda, porch, deck, balcony, or

anticipated snow level

12″(30cm) # 12″(30 cm)

BClearance to a window or door that may be opened 12″(30 cm) for appliances u10,000 Btuh (3 kW) and v

100,000 Btuh (30 kW), 36″(91 cm) for appliances u100,000

Btuh (30 kW)

9″(23 cm) for appliances u10,000 Btuh (3 kW) and v50,000

Btuh (14.7 kW), 12″(30 cm) for appliances u50,000 Btuh (14.7

kW)

CClearance to a permanently closed window * *

DVertical clearance to a ventilated soffit located above the

terminal within a horizontal distance of 2′(61cm) from the

centerline of the terminal

* *

EClearance to an unventilated soffit * *

FClearance to an outside corner * *

GClearance to an inside corner * *

HClearance to each side of the centerline extended above

electrical meter or gas service regulator assembly

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

assembly *

IClearance to service regulator vent outlet 3′(91 cm) *

JClearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

12″(30 cm) for appliances u10,000 Btuh (3 kW) and v

100,000 Btuh (30 kW), 36″(91 cm) for appliances u

100,000 Btuh (30 kW)

9″(23 cm) for appliances u10,000 Btuh (3 kW) and v

50,000 Btuh (15 kW), 12″(30 cm) for appliances u50,000

Btuh (14.7 kW)

KClearance to a mechanical air supply inlet 6′(1.83 m) 3′(91 cm) above if within 10′(3m) horizontally

LClearance under a veranda, porch, deck, or balcony 12″(30 cm) + *

MClearance to each side of the centerline extended above or

below vent terminal of the furnace to a dryer or water heater

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

12″(30 cm) 12″(30 cm)

NClearance to the vent terminal of a dryer vent, water heater

vent, or other appliances direct vent intake or exhaust.

3′(91 cm) 3′(91 cm)

OClearance from a plumbing vent stack 3′(91 cm) 3′(91 cm)

PClearance above a paved sidewalk or paved driveway lo

cated on public property.

7′(2.13 m) ** *

ugreater than, wgreater than or equal to, tless than, vless than or equal to

(1.) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

(2.) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code

# 18″(46 cm) above roof surface

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

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and

the requirements of the gas supplier and the manufacture's installation instructions.

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

Notes:

1. The vent for this appliance shall not terminate

a. Over public walkways; or

b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or

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

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

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

3. Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems.

440 01 1024 04

Specifications are subject to change without notice

Figure 9 Other than Direct Vent Termination Clearance

Item Clearance Descriptions Canadian Installation (1) U.S. Installation (2)

AClearance above grade, veranda, porch, deck, balcony, or

anticipated snow level

12″(30cm) # 12″(30 cm)

BClearance to a window or door that may be opened 12″(30 cm) for appliances u10,000 Btuh (3 kW) and v

100,000 Btuh (30 kW), 36″(91 cm) for appliances u100,000

Btuh (30 kW)

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

the opening.

CClearance to a permanently closed window * *

DVertical clearance to a ventilated soffit located above the

terminal within a horizontal distance of 2′(61cm) from the

centerline of the terminal

* *

EClearance to an unventilated soffit * *

FClearance to an outside corner * *

GClearance to an inside corner * *

HClearance to each side of the centerline extended above

electrical meter or gas service regulator assembly

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

assembly

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

assembly

IClearance to service regulator vent outlet 3′(91 cm) *

JClearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

12″(30 cm) for appliances u10,000 Btuh (3 kW) and v

100,000 Btuh (30 kW), 36″(91 cm) for appliances u

100,000 Btuh (30 kW)

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

opening.

KClearance to a mechanical air supply inlet 6′(1.83 m) 3′(91 cm) above if within 10′(3m) horizontally

LClearance under a veranda, porch, deck, or balcony 12″(30 cm)+ *

MClearance to each side of the centerline extended above or

below vent terminal of the furnace to a dryer or water heater

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

* *

NClearance to the vent terminal of a dryer vent, water heater

vent, or other appliances direct vent intake or exhaust. * *

OClearance from a plumbing vent stack * *

PClearance above a paved sidewalk or paved driveway lo

cated on public property. 7′(2.13 m) ** 7′(2.13 m)

ugreater than, wgreater than or equal to, tless than, vless than or equal to

(1.) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

(2.) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code

# 18″(46 cm) above roof surface

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

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

instructions.

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

Notes:

1. The vent for this appliance shall not terminate

a. Over public walkways; or

b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or

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

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

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

3. Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems.

18 440 01 1024 04

Specifications are subject to change without notice

Condensate Drain Trap

This furnace removes both sensible and latent heat from the

products of combustion. Removal of the latent heat results in

condensation of the water vapor. The condensate is removed from

the furnace through the drains in the plastic transition and the vent

fitting. The drains connect to the externally mounted condensate

drain trap on the left or right side of the furnace.

The startup of a new furnace will involve a cycle or two of the

furnace to properly prime the condensate trap with water. Until the

trap is fully primed, some condensate will be pulled into the

combustion blower. The furnace may cycle on the pressure switch

connected to the plastic transition box due to condensate buildup.

After the trap is primed, the condensate will start draining from the

furnace. The combustion blower will clear out any remaining

condensate in the blower housing through the vent fitting

downstream of the blower. Note that the condensate trap can also

be primed by pouring water into the 1/2″(12.7mm) drain hose.

Remove the1/2″(12.7mm) ID drain hose from either the gutter or

the white PVC tee trap. Using a funnel pour eight (8) ounces (236

ml) of water into 1/2″(12.7mm) ID drain hose. Water will flow

through the drain hose and into the condensate drain trap. This will

prime both the vent and the transition sides of the trap. Reconnect

the 1/2″(12.7mm) ID drain hose to the original component, either

the gutter or the PVC tee trap.

The condensate drain trap supplied with the furnace MUST be

used. The drain connection on the condensate drain trap is sized

for 3/4″(19.1mm) PVC or CPVC pipe, however alternate 1/2″

(12.7mm) CPVC [nominal 5/8″(15.9mm) O.D.] or vinyl tubing with

a minimum inner diameter (I.D.) of 5/8″(15.9mm) may also be

used, as allowed by local codes. Alternate drain pipes and hoses

may be used as allowed by local codes.

The drain line must maintain a 1/4″(6.4mm) per foot downward

slope toward the drain. 1/4″(6.4mm) per foot is recommended.

Installation of an overflow line is recommended when the 1/4″

(6.4mm) per foot slope to the condensate drain cannot be

maintained. A drain tube retainer clip is included in the furnace to

prevent kinking/buckling of the drain tube. The retainer clip should

remain in the furnace (between the door switch plate and the

blower shelf, Figure 10) during operation. See Figure 20 for

proper routing and installation of the overflow.

Figure 10 Drain Tube Retainer Clip Location

Drain

Tube Clip

Door

Switch

Blowe

r Shelf

Representative drawing only, some models may vary in appearance.

DO NOT trap the drain line in any other location than at the

condensate drain trap supplied with the furnace.

FROZEN AND BURST WATER PIPE HAZARD

Failure to follow this caution may result in property

damage.

If a condensate pump is installed, a plugged

condensate drain or a failed pump may cause the

furnace to shut down. Do not leave the home

unattended during freezing weather without turning

off water supply and draining water pipes or

otherwise protecting against the risk of frozen pipes.

!CAUTION

If possible, DO NOT route the drain line where it may freeze. The

drain line must terminate at an inside drain to prevent freezing of

the condensate and possible property damage.

1. A condensate sump pump MUST be used if required by

local codes, or if no indoor floor drain is available. The

condensate pump must be approved for use with acidic

condensate.

2. A plugged condensate drain line or a failed condensate

pump will allow condensate to spill. If the furnace is installed

where a condensate spill could cause damage, it is

recommended that an auxiliary safety switch be installed to

prevent operation of the equipment in the event of pump

failure or plugged drain line. If used, an auxiliary safety

switch should be installed in the R circuit (low voltage)

ONLY.

3. If the auxiliary switch in the condensate pump is used, the

furnace may shut down due to a blocked condensate line or

failed pump. To prevent frozen water pipes see the “Frozen

Water Pipe Hazard” section in this manual.

Condensate Drain Trap Freeze Protection

Special precautions MUST be made if installing furnace in an area

which may drop below freezing. This can cause improper

operation or damage to the equipment. If the the furnace

environment has the potential of freezing, the drain trap and drain

line must be protected. Use 3 to 6 watt per foot at 115 volt, 40°F

(4°C) self−regulating shielded and waterproof heat tape. Wrap the

drain trap and drain line with the heat tape and secure with the ties.

Follow the heat tape manufacturer’s recommendations.

440 01 1024 04

Specifications are subject to change without notice

INLET

EXHAUST

OFF

AIR FLOW

Figure 11 Upflow Installations Top Vent

Street Elbow

1/2 CPVC

(Loose parts bag)

Drain Tee

Coupling & Clamps

(Optional)

25−24−80

Single Pressure Switch

Dual Pressure Switch Detail

On Some Models ONLY

Plastic Caps (2)

Yellow or black

Vent Drain

& Clamps

Representative drawing only, some models may vary in appearance.

Casing Grommet

Black Rubber

5/8 (15.9mm) ID

(Loose parts bag)

Drain Connector Black PVC

3/4 (18.1mm) PVC X 1/2

(12.7mm) CPVC (Loose

parts bag)

Drain Tube

Corrugated

5/8 (15.9mm) ID &

Clamps

Drain Tube

Black Rubber

1/2 (12.7mm) ID &

Clamps

Relief Tube

Black Rubber 3/16

(4.8mm) ID

Drain Line Vent Tee 3/4

(18.1mm) PVC or 1/2 (12.7mm)

CPVC (Field supplied) Drain Tube Black Rubber 5/8 (15.9mm) ID &

Clamps, Cut length to fit (Loose parts bag)

Upflow Installations Top Vent (See Figure 11)

Remove knockout from the side of the furnace casing where drain

tube will exit.

Install casing grommet [black rubber 5/8″(15.9mm) ID grommet −

in loose parts bag].

Install the 1/2″(12.7mm) CPVC street elbow on discharge of trap

Install the black PVC tube connector [ 3/4″(18.1mm) PVC x 1/2″

(12.7mm) CPVC from loose parts bag] as shown in the illustration

above.

Cut the black drain tube [5/8″(15.9mm) ID −in loose parts bag] to

length to fit between trap and tube connector through grommet.

Clamp both ends of the drain tube using clamps provided.

Glue the CPVC street elbow to the trap using appropriate cleaner

and solvent cement.

The field supplied 3/4″(18.1mm) PVC or 1/2″(12.7mm) CPVC

drain line vent tee must vent outside the furnace cabinet (see

exploded view above).

Note: It is recommended that all PVC piping and fitting

connections be fit up and inspected before final cementing. Trap

must be primed before operation. Verify all condensate drain

connections are securely clamped. A coupling and clamps (in

loose part bag) may be installed as shown for future servicing of

the vent system.

NOTE: “PVC” is used as a generic term. Pipe and fitting materials used must be acceptable to the local code officials having

jurisdiction.

20 440 01 1024 04

Specifications are subject to change without notice

INLET

EXHAUST

OFF

ENT

Figure 12 Upflow Installations Vent through Left−Side

Coupling & Clamps

(Optional)

25−24−81

Single Pressure Switch

Dual Pressure Switch Detail

Tee Trap White PVC

(loose parts bag)

2(50.8mm) PVC

Coupling

On Some Models

ONLY

Plastic Cap

Yellow or black

Vent Drain

& Clamps

Rotate downward

5to 10

NOTE: Built-in channel will

be angled 5°to 10°also.

SIDE VIEW

AIR FLOW

Representative drawing only, some models may vary in appearance.

Drain Connector Black PVC

3/4 (19.1mm) PVC X 1/2

(12.7mm) CPVC

(Loose parts bag)

Casing Grommet

Black Rubber

5/8 (15.9mm) ID

(Loose parts bag)

Drain Line Vent Tee 3/4 (18.1mm) PVC or 1/2

(12.7mm) CPVC (Field supplied)

Drain Tube

Corrugated

5/8 (15.9mm) ID

& Clamps

Drain Tube

Black Rubber

1/2 (12.7mm) ID

& Clamps

Either: The PVC

Drain Tee or a field

supplied 2

(50.8mm) PVC Tee

Relief Tube

Black Rubber 3/16

(4.8mm) ID

Upflow Installations Vent through Left−Side (See Figure 12)

Remove drain tee from inducer discharge and remove black drain

tube 1/2″(12.7mm) ID from bottom of drain tee. (N9MPD and

*9MPD models only)

Install Vent Pipe grommet in side of casing.

Cut an appropriate length of 2″(50.8mm) PVC pipe long enough

to exit the cabinet and connect the vent drain to either:

•A standard field supplied 2″(50.8mm) PVC tee (N9MP1 or

N9MP2 models), or

•A 2″(50.8mm) PVC coupling fastened onto the drain tee

(N9MPD and *9MPD models)

Install tee trap into bottom of tee.

Remove knockout from the side of the furnace casing where drain

tube will exit.

Install the 1/2″(12.7mm) CPVC street elbow on discharge of trap

Install the black PVC drain connector [3/4″(19.1mm) PVC x 1/2″

CPVC from loose parts bag] as shown in the illustration above.

Cut the black drain tube [5/8″(15.9mm) ID −in loose parts bag] to

length to fit between trap and tube connector through grommet.

Clamp both ends of the drain tube using clamps provided.

Glue the CPVC street elbow to the trap using appropriate cleaner

and solvent cement.

Connect the tee trap and the main drain line exiting the casing as

shown in Figure 20.

Note: It is recommended that all PVC piping and fitting

connections be fit up and inspected before final cementing. Both

the internal trap and the external tee trap must be primed

before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may

be installed as shown for future servicing of the vent system.

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