ICP F9MXE0601714A1, G9MXE0401410A1, G9MXE0601714A1, G9MXE0801716A1, G9MXE1002116A1 Installation Guide

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INSTALLATION INSTRUCTIONS

Two−Stage ECM Motor and Single−Stage

35” Tall, High Efficiency Condensing Gas Furnace

(F/G)9MXT, (F/G)9MXE

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.

Signal Words in Manuals

The signal word WARNING is used throughout this manual in the following manner:

WARNING

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.

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 3.......................

INTRODUCTION 4..................................

CODES AND STANDARDS 4.........................

ELECTROSTATIC DISCHARGE PRECAUTIONS 5......

DIMENSIONS 6....................................

LOCATION 7.......................................

LOCATION RELATIVE TO COOLING EQUIPMENT 9....

AIR FOR COMBUSTION AND VENTILATION 9.........

CONDENSATE TRAP 12.............................

INSTALLATION 20...................................

UPFLOW INSTALLATION 21..........................

DOWNFLOW INSTALLATION 22.......................

HORIZONTAL INSTALLATION 23......................

AIR DUCTS 29......................................

GAS PIPING 29......................................

ELECTRICAL CONNECTIONS 32......................

J−BOX INSTALLATION 34............................

VENTING 38........................................

SPECIAL VENTING REQUIREMENTS FOR

INSTALLATIONS IN CANADA 38......................

DIRECT VENT / 2−PIPE SYSTEM 44...................

VENTILATED COMBUSTION AIR 44...................

TERMINATION REQUIREMENTS FOR THE PROVINCES OF ALBERTA AND SASKATCHEWAN 44..

Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1, 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.

INSTALLING THE VENT TERMINATION 55.............

MAXIMUM EQUIVALENT VENT LENGTH 60............

MAXIMUM ALLOWABLE EXPOSED VENT LENGTHS 63.

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 .

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

Printed in U.S.A. 440 01 4005 04 9/15/2017

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

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Specifications are subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Safety Considerations

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON MONOXIDE POISONING HAZARD

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

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

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON MONOXIDE POISONING HAZARD

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

Furnaces shall NOT be twinned (i.e. tandem or staged operation) unless approved in factory technical specifications literature for the furnace. A factory authorized, field−supplied Twinning Kit MUST be used. Consult furnace pre−sale literature for specific models approved for twinning and the correct twinning kit. Twinned furnaces must be installed on both a common supply AND a common return duct system as shown in the Twinning Kit Installation Instructions. Only two furnaces can be twinned on a common supply and return duct system using a factory authorized twinning kit.

FIRE HAZARD

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

Solvents, cements, and primers are combustible. Keep away from heat, sparks and open flame. Use only in well−ventilated areas. Avoid breathing in vapor or allowing contact with skin or eyes.

FURNACE RELIABILITY HAZARD

Failure to follow this caution may result in unit component damage.

Application of this furnace should be indoors with special attention given to vent sizing and material, gas input rate, air temperature rise, unit leveling, and unit sizing.

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

Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and

440 01 4005 05 3

WARNING

CAUTION

Specifications subject to change without notice.

qualified personnel should install, repair, or service heating equipment. Untrained personnel can perform basic

maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on heating equipment, observe precautions in literature, on tags, and on labels attached to or shipped with furnace and other safety precautions that may apply.

These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require these instructions as a minimum for a safe installation.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit.

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 protective clothing, safety glasses and

gloves when handling parts, and servicing furnaces. This is the safety−alert symbol . When you see this symbol on the furnace and in instructions or manuals, be alert to the

potential for personal injury. Understand the 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 a hazard which could result in personal injury or death. CAUTION is used to identify hazards which may result in minor personal injury or product and property damage. NOTE and NOTICE are used to highlight suggestions which will result in enhanced installation, reliability, or operation.

1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate.

2. Install this furnace only in a location and position as specified in the “Location” section of these instructions.

3. Provide adequate combustion and ventilation air to the furnace space as specified in “Air for Combustion and Ventilation” section.

4. Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in the “Venting” section of these instructions.

5. 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 the “Gas Piping” section.

6. 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 the “Start−Up, Adjustments, and Safety Check” section. See furnace rating plate.

7. 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 duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. See “Air Ducts” section.

8. A gas−fired furnace for installation in a residential garage must be installed as specified in the warning box in the “Location” section. (See Figure 4)

CAUTION

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

9. The furnace may be used for construction heat provided that the furnace installation and operation complies with the first CAUTION in the LOCATION section on page 8 of these instructions.

10. These Multipoise Gas−Fired Furnaces are CSA design−certified for use with natural and propane gases (see furnace rating plate) and for installation in alcoves, attics, basements, closets, utility rooms, crawlspaces, and garages. The furnace is factory−shipped for use with natural gas. A CSA (A.G.A. and C.G.A.) listed accessory gas conversion kit is required to convert furnace for use with propane gas.

11. See Table 1 for required clearances to combustible

construction.

12. Maintain a 1−in. (25 mm) clearance from combustible materials to supply air ductwork for a distance of 36−in. (914 mm) horizontally from the furnace. See NFPA 90B or local code for further requirements.

Table 1

POSITION

Minimum Clearances to

Combustible Materials for All Units

CLEARANCE

In(mm)

REAR 0

FRONT (Combustion air openings in

furnace and in structure)

1 (25)

Required for service *24 (610)

All Sides of Supply Plenum *1 (25)

Sides 0

Vent 0

Top of Furnace 1 (25)

* Consult local building codes

13. These furnaces SHALL NOT be installed directly on carpeting, combustible tile, or any other combustible material other than wood flooring. In downflow installations, factory accessory floor base MUST be used when installed on combustible materials and wood flooring. Special base is not required when this furnace is installed on manufacturer’s Coil Assembly or when Coil Box is used. See Table 1 for clearance to combustible construction information.

used. Refer to the furnace rating plate for conversion kit information. These furnaces are not approved for installation in recreational vehicles or outdoors. Single-stage furnaces (40k through 120k) are approved for installation in manufactured housing/mobile homes with manufacturer approved accessory. Single Stage furnace is approved for installation in a mobile home when a factory−supplied accessory mobile home conversion kit is used. The conversion kit is required for use with both natural and propane gas. The furnace must also be installed on a factory−supplied accessory combustible floor base or evaporator coil casing. This furnace is designed for minimum continuous return−air temperature of 60°F (15°C) db or intermittent operation down to 55°F (15°C) db such as when used with a night setback thermostat. Return−air temperature must not exceed 80°F (27°C) db. Failure to follow these return−air temperature limits may affect reliability of heat exchangers, motors, and controls (See Figure 1) The furnace should be sized to provide 100 percent of the design heating load requirement plus any margin that occurs because of furnace model size capacity increments. None of the furnace model sizes can be used if the heating load is 12,000 BTU or lower. Use Air Conditioning Contractors of America (Manual J and S); American Society of Heating, Refrigerating, and Air−Conditioning Engineers; or other approved engineering method to calculate heating load estimates and select the furnace. Excessive oversizing of the furnace may cause the furnace and/or vent to fail prematurely, customer discomfort and/or vent freezing. Failure to follow these guidelines is considered faulty installation and/or misapplication of the furnace; and resulting failure, damage, or repairs may impact warranty coverage. For accessory installation details, refer to the applicable instruction literature. NOTE: Remove all shipping materials, parts assemblies and literature before operating the furnace.

Figure 1

Freeze Protection and Return Air Temperature

80 / 27˚C

SUPPLY AIR

NOTICE

IMPORTANT INSTALLATION AND START−UP PROCEDURES

Failure to follow this procedure may result in a nuisance smoke or odor complaint.

The manifold pressure, gas rate by meter clocking, temperature rise and operation must be checked after installation. Minor smoke and odor may be present temporarily after start−up from the manufacturing process. Some occupants are more sensitive to this minor smoke and odor. It is recommended that doors and windows be open during the first heat cycle.

Introduction

The 4−way multipoise Category IV condensing furnace is CSA design certified as: A direct vent (2−pipe) furnace of 40,000 BTUH through 140,000 BTUH models using outside air for combustion. The 26,000 BTUH model can use the same 2−pipe venting system using outside air for combustion, but is not considered direct vent. A non−direct vent (1−pipe) furnace for all models using indoor air for combustion or from a well ventilated attic or crawl space, where permitted by local code. (See Figure 3) The furnace is factory−shipped for use with natural gas. The furnace can be converted in the field for use with propane gas when a factory−supplied conversion kit is

4 440 01 4005 05

Specifications subject to change without notice.

SEE PRODUCT DATA FOR ACCESSORY CONDENSATE TRAP HEATER AND CONDENSATE DRAIN LINE PROTECTION.

Codes and Standards

Follow all national and local codes and standards in addition to these instructions. The installation must comply

with regulations of the serving gas supplier, local building, heating, plumbing, and other codes. In absence of local codes, the installation must comply with the national codes listed below and all authorities having jurisdiction. In the United States and Canada, follow all codes and standards for the following:

Safety

S US: Current edition of the National Fuel Gas Code

(NFGC) NFPA 54/ANSI Z223.1 and the Installation Standards, Warm Air Heating and Air Conditioning Systems ANSI/NFPA 90B

S A manufactured (Mobile) home installation must

conform with the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280, or when this standard is not applicable, the Standard for Manufactured Home Installation (Manufactured Home

/ 16˚C

A150573

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Sites, Communities, and Set-Ups),ANSI/NCS A225.1, and/or CAN/CSA-Z240, MH Series Mobile Homes.

S CANADA: Current edition of the Standard of Canada,

Natural Gas and Propane Installation Code (NSCNGPIC) CAN/CSA B149.1

General Installation

S US: Current edition of the NFGC and the NFPA 90B.

For copies, contact the National Fire Protection Association Inc., Batterymarch Park, Quincy, MA 02269; or for only the NFGC contact the American Gas Association, 400 N. Capitol, N.W., Washington DC 20001

S CANADA: Current edition of the NSCNGPIC. For a

copy, contact Standard Sales, CSA International, 178 Rexdale Boulevard, Etobicoke (Toronto), Ontario, M9W 1R3, Canada.

Combustion and Ventilation Air

S US: Current edition of Section 9.3 of the

NFPA54/ANSI Z223.1, Air for Combustion and Ventilation

S CANADA: Current edition of Part 8 of the CAN/CSA

B149.1, Venting Systems and Air Supply for Appliances

Duct Systems

S US and CANADA: Current edition of the Air

Conditioning Contractors Association (ACCA) Manual D, Sheet Metal and Air Conditioning Contractors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE).

Acoustical Lining and Fibrous Glass Duct

S US and CANADA: Current edition of the SMACNA,

NFPA 90B as tested by UL Standard 181 for Class I Rigid Air Ducts

Gas Piping and Gas Pipe Pressure Testing

S U.S.A.: Current edition of the NFPA 54/ANSI Z223.1,

NFGC; Chapters 5, 6, 7, and 8 and national plumbing codes.

S CANADA: Current edition of the CAN/CSA−B149.1,

Parts 4, 5, 6 and 9.

In the state of Massachusetts:

S This product must be installed by a licensed plumber or

gas fitter.

S When flexible connectors are used, the maximum

length shall not exceed 36−in. (914 mm).

S When lever type gas shutoffs are used they shall be

T−handle type.

S The use of copper tubing for gas piping is not

approved by the state of Massachusetts.

Electrical Connections

S U.S.A.: Current edition of the National Electrical Code

(NEC) NFPA 70

S CANADA: Current edition of the Canadian Electrical

Code CSA C22.1

Condensate Drain Connection

 US: Current edition of the National Standard Plumbing

Code

 Canada: Current edition of the National Plumbing Code of

Canada

IMPORTANT: Gas furnaces manufactured on or after May 1, 2017 are not permitted to be used in Canada for heating of buildings or structures under construction.

Electrostatic Discharge (ESD) Precautions Procedure

FURNACE RELIABILITY HAZARD

Failure to follow this caution may result in unit component damage. Electrostatic discharge can affect electronic components. Take precautions during furnace installation and servicing to protect the furnace electronic control. Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the procedure. These precautions will help to avoid exposing the control to electrostatic discharge by putting the furnace, the control, and the person at the same electrostatic potential.

1. Disconnect all power to the furnace. Multiple disconnects may be required. DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE CONTROL PRIOR TO DISCHARGING YOUR BODY’S ELECTROSTATIC CHARGE TO GROUND.

2. Firmly touch the clean, unpainted, metal surface of the furnace chassis which is close to the control. Tools held in a person’s hand during grounding will be satisfactorily discharged.

3. After touching the chassis, you may proceed to service the control or connecting wires as long as you do nothing to recharge your body with static electricity (for example; DO NOT move or shuffle your feet, do not touch ungrounded objects, etc.).

4. If you touch ungrounded objects (and recharge your body with static electricity), firmly touch a clean, unpainted metal surface of the furnace again before touching control or wires.

5. Use this procedure for installed and uninstalled (ungrounded) furnaces.

6. Before removing a new control from its container, discharge your body’s electrostatic charge to ground to protect the control from damage. If the control is to be installed in a furnace, follow items 1 through 4 before bringing the control or yourself in contact with the furnace. Put all used and new controls into containers before touching ungrounded objects.

7. An ESD service kit (available from commercial sources) may also be used to prevent ESD damage.

Accessories

See Specification Sheets for a list of accessories for this product.

CAUTION

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Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 2 Dimensions

A180202

6 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

(F/G)9MXT

FURNACE SIZE

0401410 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 125 (56)

0401714 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 135 (61)

0601412 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 136 (62)

0601714 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 146 (66)

0801716 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 156 (70)

0802120 21 (533) 19−3/8 (492) 19−1/2 (495) 10−1/2 (267) 161 (73)

1002120 21 (533) 19−3/8 (492) 19−1/2 (495) 10−1/2 (267) 171 (77)

1202422 24−1/2 (622) 22−7/8 (581) 23 (584) 12−1/4 (311) 195 (88)

(F/G)9MXE

FURNACE SIZE

0261410 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 118 (54)

0401410 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 120 (54)

0401714 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 131 (59)

0601412 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 131 (59)

0601714 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 141 (63)

0801716 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) 151 (68)

0802120 21 (533) 19−3/8 (492) 19−1/2 (495) 10−1/2 (267) 156 (71)

1002120 21 (533) 19−3/8 (492) 19−1/2 (495) 10−1/2 (267) 166 (75)

1202422 24−1/2 (622) 22−7/8 (581) 23 (584) 12−1/4 (311) 190 (85)

CABINET WIDTH OUTLET WIDTH

A B C D

BOTTOM

INLET WIDTH

A B C D

BOTTOM

INLET WIDTH

AIR INTAKE

SHIP WT.

LB (KG)

SHIP WT.

LB (KG)

440 01 4005 05 7

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Location

PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD

Improper use or installation of this furnace may result in premature furnace component failure. Unless otherwise prohibited, this gas furnace may be used for heating buildings under construction provided that:

−The furnace is permanently installed with all electrical wiring, piping, venting and ducting installed according to these installation instructions. A return air duct is provided, sealed to the furnace casing, and terminated outside the space containing the furnace. This prevents a negative pressure condition as created by the circulating air blower, causing a flame rollout and/or drawing combustion products into the structure.

−The furnace is controlled by a thermostat. It may not be “hot wired” to provide heat continuously to the structure without thermostatic control.

−Clean outside air is provided for combustion. This is to minimize the corrosive effects of adhesives, sealers and other construction materials. It also prevents the entrainment of drywall dust into combustion air, which can cause fouling and plugging of furnace components.

−The temperature of the return air to the furnace is maintained between 55°F (13°C) and 80°F (27°C), with no evening setback or shutdown. The use of the furnace while the structure is under construction is deemed to be intermittent operation per our installation instructions.

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

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

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

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

General

These furnaces are shipped with materials to assist in proper furnace installation. These materials are shipped in the main blower compartment.

See Table 2 for loose parts bag contents. This furnace must:

 be installed so the electrical components are protected

from water.

 not be installed directly on any combustible material other

than wood flooring (refer to SAFETY CONSIDERATIONS).

CAUTION

 be located close to the chimney or vent and attached to an

air distribution system. Refer to Air Ducts section.

 be provided ample space for servicing and cleaning.

Always comply with minimum fire protection clearances shown in Table 1 or on the furnace clearance to combustible construction label.

Table 2 QUANTITY DESCRIPTION

1 Air Intake Pipe Flange 1 Vent Pipe Flange 2 Pipe Flange Gaskets

10 Sharp Tip Screws (Vent and Inlet Flanges)

1 Vent Pipe Coupling 2 Vent Pipe Coupling Clamps 1 Pressure Switch Tube 1 Rubber Drain Elbow 4 Drain Elbow Clamps 1 1/2”CPVC to 3/4” PVC Pipe Adapter 1 Gas Line Grommet 1 Gas Line Knockout Plug 1 Junction Box Cover 1 Junction Box Base 1 Green Ground Screw 3 Blunt Tip Screws (Junction Box) 1 Thermostat Wire Grommet

Provided separately in furnace

1 Drain Extension Tube − “Z” Pipe

NOTE: The 26K and 40K models are the only furnace that receives the outlet restrictor in loose parts bag. See Maximum Equivalent Vent Length Table for usage.

Loose Parts Bag Contents

Outlet Restrictor Plate − see NOTE (Provided with 26K and 40K BTUH furnaces, only)

WARNING

CARBON MONOXIDE POISONING / COMPONENT DAMAGE HAZARD

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

Corrosive or contaminated air may cause failure of parts containing flue gas, which could leak into the living space. Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products. Do not install furnace in a corrosive or contaminated atmosphere. Make sure all combustion and circulating air requirements are met, in addition to all local codes and ordinances.

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Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

The following types of furnace installations may require OUTDOOR AIR for combustion due to chemical exposures:

 Commercial buildings  Buildings with indoor pools  Laundry rooms  Hobby or craft rooms, and  Chemical storage areas

If air is exposed to the following substances, it should not be used for combustion air, and outdoor air may be required for combustion:

 Permanent wave solutions  Chlorinated waxes and cleaners  Chlorine based swimming pool chemicals  Water softening chemicals

Figure 3 Multipoise Orientations

THE BLOWER IS LOCATED

TO THE RIGHT OF THE

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED TO THE LEFT.

 De−icing salts or chemicals  Carbon tetrachloride  Halogen type refrigerants  Cleaning solvents (such as perchloroethylene)  Printing inks, paint removers, varnishes, etc.  Hydrochloric acid  Cements and glues  Antistatic fabric softeners for clothes dryers  Masonry acid washing materials

All fuel−burning equipment must be supplied with air for fuel combustion. Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and the return−air duct to prevent pulling air from the burner area.

THE BLOWER IS

LOCATED BELOW THE

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED UPWARD.

THE BLOWER IS

LOCATED ABOVE THE

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED DOWNWARD.

WARNING

FIRE, INJURY OR DEATH HAZARD

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

When the furnace is installed in a residential garage, the burners and burner ignition devices must be located at least 18−in. (457 mm) above the floor. The furnace must be located or protected to avoid damage by vehicles. When the furnace is installed in a public garage, airplane hanger, or other building having a hazardous atmosphere, the furnace must be installed in accordance with the current edition of the NFPA 54/ANSI Z223.1 or CAN/CSA B149.1. (See Figure 4)

THE BLOWER IS

LOCATED TO THE LEFT

OF THE BURNER SECTION,

AND CONDITIONED AIR IS

DISCHARGED TO THE RIGHT.

L12F010

Figure 4 Installation in a Garage

A93044

440 01 4005 05 9

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

FIRE HAZARD

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

Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return−air ducts to the back of the furnace. (See Figure 5)

WARNING

Figure 5 Prohibit Installations

BACK POSITIONED DOWNWARD

BACK POSITIONED UPWARD

AIR RETURN CUT IN BACK

Ventilated Combustion Air Applications

When the furnace is installed using the ventilated combustion air option, the attic or crawlspace must freely communicate with the outdoor to provide sufficient air for combustion. The combustion air pipe cannot be terminated in attics or crawlspaces that use ventilation fans designed to operate during the heating season. If ventilation fans are present in these areas, the combustion air pipe must terminate outdoors as a Direct Vent/ 2-Pipe system.

All air for combustion is piped directly to the furnace from a space that is well ventilated with outdoor air (such as an attic, crawlspace, or equipment closet) and the space is well isolated from the living space or garage. In addition, other gas appliances installed in the space with the furnace may require outside air for combustion. Follow the guidelines below to insure that the roof or crawlspace walls have sufficient free area to provide sufficient air for combustion and ventilation for the furnaces. The guidelines below can be used to insure that other gas appliances have sufficient air for combustion.

Provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:

 U.S. Installations: Current edition of Section 9.3 of the

NFPA 54/ANSI Z223.1, Air for Combustion and Ventilation and applicable provisions of the local building codes.

 Canadian Installations: Current edition of Part 8 of

CAN/CSA−B149.1, Venting Systems and Air Supply for Appliances and all authorities having jurisdiction.

L12F011

Location Relative to Cooling Equipment

The cooling coil must be installed parallel with, or on the downstream side of the unit to avoid condensation in the heat exchangers. When installed parallel with the furnace, dampers or other flow control must prevent chilled air from entering the furnace. If the dampers are manually operated, they must be equipped with means to prevent operation of either unit unless the damper is in the full−heat or full−cool position.

Air for Combustion and Ventilation

Introduction

Direct Vent (2−pipe) Applications

When the furnace is installed as a direct vent (2-pipe) furnace, no special provisions for air for combustion are required. However, other gas appliances installed in the space with the furnace may require outside air for combustion. Follow the guidelines below to insure that other gas appliances have sufficient air for combustion.

Non−Direct Vent (1−pipe) Applications

When the furnace is installed as a non-direct vent (1-pipe) furnace, it will be necessary to insure there is adequate air for combustion. Other gas appliances installed with the furnace may also require air for combustion and ventilation in addition to the amount of combustion air and ventilation air required for the furnace. Follow the guidelines below to insure that the furnace and other gas appliances have sufficient air for combustion.

FURNACE CORROSION HAZARD

Failure to follow this caution may result in furnace damage.

Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products.

CARBON MONOXIDE POISONING HAZARD

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

The operation of exhaust fans, kitchen ventilation fans, clothes dryers, attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE CONDITION at the furnace. Make−up air MUST be provided for the ventilation devices, in addition to that required by the furnace. Refer to the Carbon Monoxide Poisoning Hazard warning in the venting section of these instructions to determine if an adequate amount of make−up air is available.

The requirements for combustion and ventilation air depend upon whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1,000 Btuh (4.8 cubic meters per kW) input rating for all gas appliances installed in the space.

 Spaces having less than 50 cubic feet per 1,000 Btuh (4.8

cubic meters per kW) require the OUTDOOR COMBUSTION AIR METHOD.

 Spaces having at least 50 cubic feet per 1,000 Btuh (4.8

cubic meters per kW) may use the INDOOR

COMBUSTION AIR, STANDARD or KNOWN AIR INFILTRATION METHOD.

CAUTION

WARNING

10 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Outdoor Combustion Air Method

1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horizontal or vertical duct(s) or opening(s) directly communicating with the outdoors or spaces that freely communicate with the outdoors.

2. Figure 6 illustrates how to provide TWO OUTDOOR OPENINGS, one inlet and one outlet combustion and ventilation air openings to the outdoors.

appliance in the space and add the volumes together to get the total minimum required volume for the space.

Table 4 − Minimum Space Volumes were determined by using the following equations from the current edition of the National Fuel Gas Code ANSI Z223.1/NFPA 54, 9.3.2.2:

1. For other than fan-assisted appliances, such as a

draft hood-equipped water heater

A04002

a. One opening MUST commence within 12-in.

(300 mm) of the ceiling and the second opening MUST commence within 12-in. (300 mm) of the floor.

2. For fan-assisted appliances such as this furnace:

A04003

b. Size openings and ducts per Figure 6 and Table 3. c. TWO HORIZONTAL DUCTS require 1 square inch

(25.4 square mm) of free area per 2,000 Btuh (1,100

/kW) of combined input for all gas appliances in

the space per Figure 6 and Table 3.

d. TWO OPENINGS OR VERTICAL DUCTS require 1

square inch (25.4 square mm)of free area per 4,000 Btuh (550 mm

/kW) for combined input of all gas

appliances in the space per Figure 6 and Table 3.

3. ONE OUTDOOR OPENING requires:

a. 1 sq. in. (25.4 square mm)of free area per 3,000 Btuh

(734 mm

/kW) for combined input of all gas

appliances in the space per Table 3 and

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

connectors in the space.

The opening shall commence within 12-in. (300 mm) of the ceiling. Appliances in the space shall have clearances of at least 1-in. (25 mm) from the sides and back and 6-in. (150 mm) 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.

Indoor Combustion Air



NFPA & AGA

Standard and Known-Air-Infiltration Rate Methods

Indoor combustion air is permitted for combustion, ventilation,

and dilution, if the Standard or Known-Air-Infiltration Rate Method is used.

CARBON MONOXIDE POISONING HAZARD

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

Many homes require air to be supplied from outdoors for furnace combustion, ventilation, and dilution of flue gases.

The furnace combustion air supply must be provided in accordance with this instruction manual.

WARNING

If: I

other=combined input of all other than fan-assisted

appliances in Btuh/hr

fan=combined input of all fan-assisted appliances in Btuh/hr

I ACH = air changes per hour (ACH shall not exceed 0.60.) The following requirements apply to the Standard Method and

to the Known Air Infiltration Rate Method.

1. Adjoining rooms can be considered part of a space if: a. There are no closable doors between rooms. b. Combining spaces on same floor level. Each opening

shall have free area of at least 1-in. (2,000 mm

/kW) of the total input rating of all gas

/1,000 Btuh

appliances in the space, but not less than 100-in. (0.06 m2). One opening shall commence within 12−in. (300 mm) of the ceiling and the second opening shall commence within 12-in. (300 mm) of the floor. The minimum dimension of air openings shall be at least 3-in. (80 mm). (See Figure 7)

c. Combining space on different floor levels. The

volumes of spaces on different floor levels shall be considered as communicating spaces if connected by one or more permanent openings in doors or floors having free area of at least 2−in. (4,400 mm

/kW) of total input rating of all

/1,000 Btuh

gas appliances.

2. An attic or crawlspace may be considered a space that

freely communicates with the outdoors provided there are adequate permanent ventilation openings directly to outdoors having free area of at least 1-in.

/4,000 Btuh of

total input rating for all gas appliances in the space.

3. In spaces that use the Indoor Combustion Air Method,

infiltration should be adequate to provide air for combustion, permanent ventilation and dilution of flue gases. However, in buildings with unusually tight construction, additional air MUST be provided using the methods described in the Outdoor Combustion Air Method section.

4. Unusually tight construction is defined as Construction

with:

The Standard Method:

1. The space has no less volume than 50 cubic feet per 1,000 Btuh (4.8 cubic meters per kW) of the maximum input ratings for all gas appliances installed in the space and

2. The air infiltration rate is not known to be less than 0.40 air changes per hour (ACH).

The Known Air Infiltration Rate Method shall be used, if the infiltration rate is known to be:

1. Less than 0.40 ACH and

a. Walls and ceilings exposed to the outdoors have a

continuous, sealed vapor barrier. Openings are gasketed or sealed and

b. Doors and openable windows are weatherstripped

and

c. 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.

2. 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 4 or Equations 1 and 2. Determine the minimum required volume for each

440 01 4005 05 11

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Combination of Indoor and Outdoor Air

1. Indoor openings shall comply with the Indoor Combustion Air Method below and,

2. Outdoor openings shall be located as required in the Outdoor Combustion Air Method mentioned previously and,

3. Outdoor openings shall be sized as follows:

b. Outdoor opening size reduction Factor is one minus

the Ratio in a. above.

c. Minimum size of Outdoor openings shall be the size

required in Outdoor Combustion Air Method above multiplied by reduction Factor in b. above. The minimum dimension of air openings shall be not less than 3-in. (80 mm).

a. Calculate the Ratio of all Indoor Space volume

divided by required volume for Indoor Combustion

Air Method.

Table 3 Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors

TWO OPENINGS OR

VERTICAL DUCTS

(1 SQ. IN./4,000 BTUH)

(550 SQ. MM/KW)

Free Area of Open-

ing and Duct

Sq. In (mm)

FURNACE INPUT (BTUH)

TWO HORIZONTAL DUCTS

(1 SQ. IN./2,000 BTUH)

(1,100 SQ. MM/KW)

Free Area of

Opening and Duct

Sq. In (Sq. mm)

Round

In. (mm)

Duct

Dia

SINGLE DUCT OR OPENING

(1 SQ. IN./3,000 BTUH)

(734 SQ. MM/KW)

Free Area of Open-

ing and Duct

Sq. In (Sq. mm)

Round

Duct

In. (mm)

Dia

26,000 * 13 (8388) 4 (102) 9 (5807) 4 (102) 7 (4517) 3 (77) 40,000 * 20 (12904) 5 (127) 14 (8696) 5 (127) 10 (6452) 4 (102) 60,000 30 (19355) 6 (152) 20 (13043) 5 (127) 15 (9678) 5 (127) 80,000 40 (25807) 7 (178) 27 (17391) 6 (152) 20 (12904) 5 (127) 100,000 50 (32258) 8 (203) 34 (21739) 7 (178) 25 (16130) 6 (152) 120,000 60 (38709) 9 (229) 40 (26087) 7 (178) 30 (19355) 6 (152) 140,000 * 70 (45161) 10 (254) 47 (30435) 8 (203) 35 (22581) 7 (178)

Round Duct

In. (mm)

Dia.

* Not all families have these models.

EXAMPLE: Determining Free Area

FURNACE WATER HEATER TOTAL INPUT

100,000 + 30,000 = (130,000 divided by 4,000) = 32.5 Sq. In. for each two Vertical Ducts or Openings

60,000 + 40,000 = (100,000 divided by 3,000) = 33.3 Sq. In. for each Single Duct or Opening 80,000 + 30,000 = (110,000 divided by 2,000) = 55.0 Sq. In. for each two Horizontal Ducts

Table 4 Minimum Space Volumes for 100% Combustion, Ventilation and Dilution Air from Outdoors

OTHER THAN FAN‐ASSISTED TOTAL

(1,000'S BTUH GAS INPUT RATE)

ACH

0.60

0.50

0.40

0.30

0.20

0.10

0.00 NP NP NP NP NP NP NP NP NP NP

NP = Not Permitted

30 40 50 26 40 60 80 100 120 140

Space Volume Ft

1,050 (29.7)

1,260 (35.6)

1,575 (44.5)

2,100 (59.4)

3,150 (89.1)

6,300

(178.0)

1,400 (39.6)

1,680 (47.5)

2,100 (59.4)

2,800 (79.2)

4,200

(118.9)

8,400

(237.8)

1,750

(49.5)

2,100 (59.4)

2,625 (74.3)

3,500 (99.1)

5,250

(148.6)

10,500

(297.3)

910

(25.8)

1,092 (30.9)

1,365 (38.7)

1,820 (51.5)

2,730 (77.3)

5,460

(154.6)

1,400 (39.6)

1,680 (47.5)

2,100 (59.4)

2,800 (79.2)

4,200

(118.9)

8,400

(237.8)

FAN‐ASSISTED TOTAL

(1,000'S BTUH GAS INPUT RATE)

)

1,500 (42.5)

1,800 (51.0)

2,250 (63.7)

3,000 (84.9)

4,500

(127.3)

9,000

(254.6)

2,000 (56.6)

2,400 (67.9)

3,000 (84.9)

4,000

(113.2)

6,000

(169.8)

12,000 (339.5)

2,500

(70.8)

3,000 (84.9)

3,750

(106.1)

5,000

(141.5)

7,500

(212.2)

15,000 (424.4)

3,000 (84.9)

3,600

(101.9)

4,500

(127.3)

6,000

(169.8)

9,000

(254.6)

18,000 (509.2)

3,500 (99.1)

4,200

(118.9)

5,250

(148.6)

7,000

(198.1)

10,500 (297.1)

21,000 (594.1)

12 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 6

Figure 7

Air for Combustion, Ventilation, and Dilution for Outdoors

*Minimum dimensions of 3‐in. (76mm)

NOTE: Use any of the following combinations of openings:

A & B, C & D, D & E, F & G

Air for Combustion, Ventilation, and Dilution from Indoors

CONDENSATE TRAP

Condensate Trap − Upflow Orientation

When the furnace is installed in the upflow position, it is not necessary to relocate the condensate trap or associated tubing. Refer to Figure 8 for upflow condensate trap information. Refer to Condensate Drain section for information how to install the condensate drain.

Condensate Trap − Downflow Orientation

When the furnace is installed in the downflow position, the condensate trap will be initially located at the upper left corner of the collector box, as received from the factory. See the top image in Figure 9. When the furnace is installed in the downflow orientation, the condensate trap must be relocated for proper condensate drainage. See the bottom image in

Figure 9.

To Relocate the Condensate Trap:

S Orient the furnace in the downflow position. S Figure 9 shows the condensate trap and tubing before and

after relocation. Refer to Figure 9 to begin the trap conversion.

S Refer to Condensate Drain section for information how to install

the condensate drain.

L12F012

* Minimum opening size is 100 sq in. (64516 sq. mm) with

minimum dimensions of 3‐in. (76mm)

{ Minimum of 3‐in. (76mm) when type‐B1 vent is used.

440 01 4005 05 13

L12F013

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 8 Upflow Trap Configuration

Vent Pipe Clamp

Condensate Trap

Relief Port

Collector Box

Plugs

Pressure Switch

Port

UPFLOW TRAP CONFIGURATION

1 & 2 Stage Units

Representative drawing only, some models may vary in appearance.

Vent Elbow Clamp

Vent Elbow

Collector Box

Plug

Condensate Trap

Relief Port

Condensate Trap

Outlet

A11307

Figure 9 Unconverted Factory Configuration as viewed in the Downflow Orientation

Remove pressure switch tube from front pressure switch and discard. A new tube is shipped in the loose parts

Remove relief tube from relief port on condensate trap.

Remove the screw that secures the trap to the collector box and remove trap.

Loosen clamp on inlet to vent elbow.

Representative drawing only, some models may vary in appearance.

bag.

Remove tube from relief port.

Remove middle and bottom plugs. DO NOT DISCARD.

A11587LA

14 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Downflow Trap Configuration

Connect the new pressure switch tube from Loose Parts bag to port on front pressure switch.

Install the two plugs previously removed on the open ports of the collector box.

Route tube through inducer stand−offs to adjust position of the tube.

Trim excess tube. Connect pressure switch tube to port on collector box.

Connect relief tube to port on collector box.

Rotate elbow to desired position and tighten clamp to 15 lb.−in.

Slide tube in stand−offs

to adjust length.

Representative drawing only, some models may vary in appearance.

Condensate Trap − Horizontal Orientation

When the furnace is installed in the horizontal right position, the condensate trap will be initially located at the bottom of the collector box, as received from the factory. See the top image in Figure 10. When the furnace is installed in the horizontal left position, the condensate trap will be initially located at the top of the collector box, as received from the factory. See the top image in Figure 11. In both cases the trap must be repositioned on the collector box for proper condensate drainage. See bottom images in Figure 10 and Figure 11.

A field−supplied, accessory Horizontal Installation Kit (trap grommet) is required for all direct−vent horizontal installations (only). The kit contains a rubber casing grommet designed to seal between the furnace casing and the condensate trap. (See

Figure 16)

NOTICE

The field-supplied, accessory horizontal drain trap grommet is ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. It is NOT required for applications using single-pipe or ventilated combustion air venting.

Attach condensate trap with screw to collector box.

Connect relief tube to

relief port on condensate trap.

Align condensate trap over middle and bottom ports of collector box.

A11587LB

NOTICE

The condensate trap extends below the side of the casing in the horizontal position. A minimum of 2-in. (51 mm) of clearance is required between the casing side and the furnace platform for the trap to extend out of the casing in the horizontal position. Allow at least 1/4-in. per foot (20mm per meter) of slope down and away from the furnace in horizontal sections of drain line.

To Relocate the Condensate Trap:

S Remove the knockout in the casing for the condensate trap. S Install the grommet in the casing when required for direct−vent

horizontal applications.

S Orient the furnace in the desired position. S Allow for 2 in. (51 mm) of clearance underneath the furnace for

the condensate trap and drain line.

S Figure 10 shows the condensate trap and tubing before and

after relocation in the horizontal right position.

S Figure 11 shows the condensate trap and tubing before and

after relocation in the horizontal left position.

S Refer to the appropriate figure to begin the trap conversion. S Refer to Condensate Drain section for information how to install

the condensate drain.

440 01 4005 05 15

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 10 Unconverted Factory Configuration as viewed in the Horizontal Right Orientation

Remove plug from collector box. DO NOT DISCARD.

Horizontal Right Trap Configuration (continued)

NOTE: Remove knockout in casing before re−installing the condensate trap.

Attach condensate trap with screw to collector box.

If alternate vent position is required, loosen clamp on inlet of vent elbow.

Remove the screw that secures the trap to the collector box and remove trap.

Representative drawing only, some models may vary in appearance.

Slide relief tube in stand−offs to adjust length.

A11573LA

Vent elbow shown in alternate orientation. Tighten clamp on inlet to vent elbow 15 lb.−in.

Install plug on open port of collector box

Representative drawing only, some models may vary in appearance.

16 440 01 4005 05

Specifications subject to change without notice.

Align trap over middle and right−hand port on collector box.

A11573LB

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 11 Unconverted Factory Configuration as viewed in the Horizontal Left Orientation

Remove the screw that secures the condensate trap to the collector box

If alternate vent position

is required, loosen clamp on vent elbow inlet.

Remove relief tube from port on collector box.

Representative drawing only, some models may vary in appearance.

and remove trap.

Remove relief tube from relief port on condensate trap.

Remove middle and right

plug from collector box. DO NOT DISCARD.

Remove front pressure switch tube and discard. A new tube is shipped in the Loose Parts bag.

A11574LA

Horizontal Left Trap Configuration (continued)

NOTE: Remove knockout in casing before re−installing the condensate trap.

Rotate elbow to

desired position and torque clamp on inlet 15 lb.−in.

Install two plugs previously removed in open ports on collector box.

Connect relief tube to port on collector box.

Slide relief tube in stand−offs to adjust length.

Attach condensate trap with screw to collector box.

Align trap over middle and right−hand port on collector box.

Representative drawing only, some models may vary in appearance.

Connect the new pressure switch

tube from Loose Parts bag to port on front pressure switch.

Route pressure switch tube underneath relief tube and

connect to port on collector box.

Connect relief tube to relief port on condensate trap.

A11574LB

440 01 4005 05 17

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Condensate Drain Connection

FROZEN AND BURST WATER PIPE HAZARD

Failure to protect against the risk of freezing 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 drain line must be protected. The use of accessory drain trap heaters, electric heat tape and/or RV antifreeze is required for these installations.

PROPERY DAMAGE HAZARD

Failure to follow this caution may result in burst water pipes and/or 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.

DO NOT trap the drain line in any other location than at the condensate drain trap supplied with the furnace. 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.

Special precautions MUST be made if installing furnace in an area which may drop below 32°F (0°C). This can cause improper operation or damage to the equipment. If the furnace environment has the potential of freezing, the drain trap and drain line must be protected. In areas where the temperature may be below 32°F (0°C), a Condensate Freeze Protection kit is required. The kit includes a condensate trap with heat pad and replaces the factory−installed condensate trap. Refer to the accessory section of the Specification Sheets for current kit number. A self−regulating, shielded and waterproof heat tape rated at 3 to 6 watt per foot (10 to 20 watt per meter) at 115 volt, 40° F (4° C) may be used to provide freeze protection of the remaining condensate drain line. Wrap the drain trap and the drain line with the heat tape and secure with appropriate plastic ties. Follow the heat tape manufacturer’s recommendations. Prime the trap before furnace operation.

The condensate drain line must be supported and/or secured per local codes. Supports and clamps should be spaced to prevent the drain line from sagging or being dislocated from the furnace or termination point. In the absence of local codes, consult current edition of the National Standard Plumbing Code, in the US or current edition of the National Plumbing Code of Canada in Canada.

CAUTION

c. All condensate piping is at least 1/2 in. PVC and

there is a relief tee at the top of condensate drain piping as shown below:

NOTE: On narrower casings, it may be easier to remove the condensate trap, connect the drain line components and re-install the condensate trap. Read the steps thoroughly to familiarize yourself with the required steps.

For Right Side Condensate Drain:

1. Remove the 7/8−in. knock−out from the right side of the

casing. (See Figure 12 for suggested knockout removal technique.)

2. Remove the pre−formed rubber drain elbow and two spring clamps from the loose parts bag.

3. Slide a spring clamp 1−in. (25 mm) down the plain end (the end without the formed grommet) of the drain elbow.

4. From inside the casing, insert the formed grommet end of the elbow through the 7/8−in. knockout in the casing.

5. Pull the grommet through the casing from the outside until it is seated in the knockout

6. Attach the plain end of the drain elbow to the outlet stub on the drain trap. Secure the drain elbow to the trap with the spring clamp.

The remaining drain line can be constructed from field supplied 1/2−in. CPVC or 3/4−in. PVC pipe in compliance with local building codes. A factory−supplied 1/2−in. CPVC to 3/4−in PVC adapter is supplied in the loose parts bag for use as required.

7. Install the adapter or connect the 1/2−in. CPVC pipe by sliding a spring clamp over the open end of the grommet on the outside of the furnace casing.

8. Open the spring clamp and insert the long end of the adapter of the 1/2−in. CPVC pipe into the outlet stub on the drain elbow.

9. Connect additional condensate piping to a code−approved drain, or to a condensate pump approved for use with acidic furnace condensate and compatible with mineral and vegetable oils, such as canola oil.

Allow at least 1/4−in. per foot (20 mm per meter) of slope down and away from the furnace in horizontal sections of drain line.

TIPS FROM CONTRACTORS: Contractors have found that temporarily removing the inducer assembly in upflow applications while performing the steps below, makes upflow left−side drain connections easier.

Figure 12 Knockout Removal

Upflow/Downflow Orientation

In the Upflow or Downflow orientation, the condensate trap is inside the furnace casing. The condensate drain must be routed from the trap through the furnace casing. The condensate drain can be routed through the left or right side of the casing. (The left or right side is as you are viewing/facing the furnace from the front.)

An indoor coil condensate drain or humidifier drain can be connected to the external furnace condensate drain provided:

a. The drains are not hard piped together, and b. There is an air gap at the point where the two drain

lines meet or

18 440 01 4005 05

Specifications subject to change without notice.

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 protective clothing, safety glasses and gloves when handling parts, and servicing furnaces.

CAUTION

L12F019

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

For Left Side Condensate Drain Connection:

1. For left side condensate drainage, the drain line is routed from the condensate trap, behind the inducer (upflow) or gas valve (downflow) and out through the left side of the furnace casing. A pre-formed 1/2−in. CPVC “Z” pipe is provided with the furnace. The “Z“ pipe is long enough to extend across the casing for drain connections.

2. Locate the “Z” pipe. Remove the pre-formed drain elbow and four spring clamps from the loose parts bag.

3. The “Z” pipe is connected to the condensate trap and the outside of the furnace by modifying the formed rubber drain elbow as shown in Figure 17.

4. Remove the formed grommet from the rubber drain elbow by cutting the elbow along the vertical line located about 1 3/8−in. (35 mm) away from the formed grommet. See Figure 15. DO NOT DISCARD THE FORMED GROMMET OR THE RUBBER ELBOW. Both of these pieces will be used.

Assemble and route the drain line to the opposite side of the furnace as detailed below:

5. Remove the knock−out from the left side of the casing. (See Figure 12 for suggested knockout removal technique.)

6. From the outside of the casing, insert the angled end of the ”Z” pipe through drain hole in the left side of the casing and behind the inducer or gas valve. Allow the ”Z” pipe to temporarily rest on the blower shelf (upflow) or burner box (downflow). (NOTE: When the inducer housing has been removed to ease installation in upflow applications, this step is not needed.)

7. After inserting the “Z” pipe through the casing, slide a spring clamp over each end of the “Z” pipe.

8. From inside the casing, insert the short end of the formed grommet cut from the rubber drain elbow through the 7/8−in. drain knockout in the casing.

9. Pull the grommet through the casing from the outside until it is seated in the knockout.

10. Align the ”Z” pipe with the long end of the grommet inside the furnace and insert slightly. The angled end of the tube at the other side of the casing should be facing the front of the furnace.

11. Slide a spring clamp over the end of the remaining rubber drain elbow.

12. Attach the drain elbow to the angled end of ”Z” pipe and the drain trap outlet stub. Adjust the length of ”Z” pipe inserted into the grommet at the opposite side of the furnace as necessary for proper fit and positioning. In both upflow and downflow orientations, the ”Z” pipe should NOT be resting on any sheet metal parts.

13. Secure the rubber elbow to the drain trap and the ”Z” pipe with spring clamps.

14. Secure the grommet to the ”Z” pipe with the spring clamp. The remaining drain line can be constructed from field supplied 1/2−in. CPVC or 3/4−in. PVC pipe, in compliance with local building codes. A factory−supplied 1/2−in. CPVC to 3/4−in. PVC adapter is supplied in the loose parts bag for use as required.

15. Install the adapter or connect the 1/2−in. CPVC pipe by sliding a spring clamp over the open end of the grommet on the outside the furnace casing.

16. Open the spring clamp and insert the long end of the adapter or the 1/2−in. CPVC pipe into the outlet stub on the drain elbow.

17. Connect additional condensate piping to a code−approved drain, or to a condensate pump approved for use with acidic furnace condensate and compatible with mineral and vegetable oils, such as canola oil.

Allow at least 1/4-in. per foot (20 mm per meter) of slope down and away from the furnace in horizontal sections of drain line.

NOTICE

The field-supplied, accessory horizontal drain trap grommet is ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. It is NOT required for applications using single-pipe or ventilated combustion air venting.

TIPS FROM CONTRACTORS: When installing the furnace horizontally, use the entire drain elbow (that is, do NOT cut as shown in Figure 15) to connect the trap to the drain line. This helps to prevent bumps and shocks to the drain line from damaging the furnace drain trap. Avoid misalignment of the drain pipe which may cause kinks in the elbow.

Horizontal Orientation

1. The condensate trap outlet extends 2−in. (51 mm) below the furnace casing. Leave enough clearance between the furnace and the furnace platform for the trap.

2. To allow for servicing the trap, the condensate drain elbow in the loose parts bag can be used to make a coupler to allow for future service of the condensate trap and drain line.

3. Remove the knock−out for the condensate trap in the side of the casing.

4. Install the drain trap grommet in the casing, if required for direct−vent applications. If necessary, remove the trap, install the grommet and re−install the trap.

5. Remove the pre−formed rubber drain elbow and two spring clamps from the loose parts bag.

6. Connect the full or modified elbow and/or grommet to the outlet of the condensate trap with one spring clamp. Avoid misalignment of the drain pipe which may cause kinks in the elbow or grommet.

7. The remaining drain line can be constructed from field supplied 1/2−in. CPVC or 3/4−in. PVC pipe, in compliance with local building codes. A factory−supplied 1/2−in. CPVC to 3/4−in. PVC adapter is supplied in the loose parts bag for use as required.

8. Install the adapter or connect the 1/2−in. CPVC pipe by sliding a spring clamp over the open end of the elbow or grommet on the outside the furnace casing.

9. Open the spring clamp and insert the long end of the adapter or the 1/2−in. CPVC pipe into the outlet stub on the drain elbow.

10. Connect additional condensate piping to a code−approved drain, or to a condensate pump approved for use with acidic furnace condensate and compatible with mineral and vegetable oils, such as canola oil.

Allow at least 1/4-in. per foot (20 mm per meter) of slope down and away from the furnace in horizontal sections of drain line.

440 01 4005 05 19

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 13

AIRFLOW

DIRECTION

AIRFLOW

DIRECTION

Example of Field Drain Attachment (NOT ALLOWED)

Evaporator Coil

Condensing

Furnace

Blower

Evaporator Coil

Condensing

Furnace

< +

Blower

+ = Positive pressure < + = Pressure lower than areas with +

− = Negative pressure

+ = Positive pressure < + = Pressure lower than areas with +

− = Negative pressure

Blower creates positive pressure.

Positive pressure extends into coil condensate drain (no trap).

Furnace condensate does not flow consistently when drain is at positive pressure.

A14532A

Open

3/4

standpipe

3/4” PVC

1/2” CPVC or larger*

3/4

A14532B

3/4

< +

3/4” PVC

< +

1/2

Figure 14 Example of Field Drain Attachment

&RLORUKXPLGLILHUGUDLQ ZKHQXVHG

Air gap here

Open standpipeLQKLJK

Evaporator Coil

Condensing

Furnace

Blower

AIRFLOW

DIRECTION

+ = Positive pressure < + = Pressure lower than areas with +

ï = Negative pressure

PLQLPXP for coilor

humidifier drain TEE (1/2” CPVC to 3/4” PVC adapter from loose parts bag.)

3/4” PVC

3/4

3/4” PVC

3/4

Open standpipeLQKLJKPLQLPXP Air gap required when

another drain is connected

to furnace drain.

3/4

TEE

< +

3/4

(1/2” CPVC to 3/4” PVC

adapter from loose parts bag.)

< +

3/4

To open drain

A170136

A170139

Evaporator Coil

AIRFLOW

DIRECTION

Condensing

+ = Positive pressure < + = Pressure lower than areas with +

− = Negative pressure

20 440 01 4005 05

Furnace

Blower

3/4” PVC

3/4

3/4” PVC

3/4

1/2” CPVC or larger*

< +

3/4

A14532C

Specifications subject to change without notice.

< +

Evaporator Coil

Condensing

Furnace

DIRECTION OF AIRFLOW

Blower

= Positive pressure

+ < +

= Pressure lower than areas with +

( = Negative pressure

3/4

< +

< + < +

3/4” PVC

3/4

standpipe

Open (Optional

when coil drain not drain.)

3/4” PVC

1/2” CPVC or larger* Recommend “T” fitting with minimum 4ïinch open standpipe of same diameter or larger extending upward

3/4

connected to

furnace

A170129

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Example of Field Drain Attachment cont.

Evaporator Coil

3/4

< +

3/4

Open standpipe (Optional when coil drain is not connected to furnace drain.)

3/4” PVC

TEE (1/2” CPVC to 3/4” PVC adapter from loose parts bag.)

Condensing

AIRFLOW

DIRECTION

Furnace

3/4” PVC

3/4

< +

Blower

+ = Positive pressure < + = Pressure lower than areas with +

ï = Negative pressure

Figure 15 Modify Rubber Drain Elbow

Cut line for left side condensate drain. Do not discard parts after cutting.

3/4

L14F027

Figure 17 Drain Trap Connection and Routing

FORMED END OF GROMMET

CONNECT SHORT END OF ’Z’ PIPE TO MODIFIED DRAIN ELBOW

FACTORY SUPPLIED 1/2−IN. CPVC TO 3/4−IN. PVC ADAPTER

DRAIN ELBOW “Z” DISCHARGE PIPE FOR LEFT SIDE

DRAIN IS ROUTED BEHIND INDUCER

FORMED END OF GROMMET. OPEN SPRING CLAMP, INSERT 1/2−IN. TO 3/4−IN. CPVC TO PVC ADAPTER OR CPVC PIPE

MODIFIED DRAIN ELBOW CONNECT TO CONDENSATE TRAP AND ’Z’ PIPE

LEFT SIDE DRAIN PIPE ORIENTATION FOR CONDENSATE DISCHARGE

NOTE: Remove Inducer Housing for easier access, if desired.

CUT OFF FORMED END FROM CONDENSATE DRAIN ELBOW

TOP VIEW

FRONT VIEW

ATTACH ELBOW TO CONDENSATE TRAP

A170128

1−3/8 in (35 mm)

L11F089

Figure 16 Horizontal Drain Trap Grommet

Remove knockout. Install grommet before relocating condensate trap.

A11348

Figure 18 Formed Rubber Drain Grommet

INSTALL CLAMPS ON DRAIN ELBOW ATTACH DRAIN ELBOW TO CONDENSATE DRAIN TRAP

PULL DRAIN STUB THROUGH CASING

OPEN SPRING CLAMP

INSERT FACTORY−SUPPLIED 1/2−IN. CPVC TO 3/4−IN. PVC ADAPTER OR 1/2−IN. CPVC PIPE

*CLAMP MAY BE LOCATED ON OUTSIDE OF DRAIN ELBOW

INSTALLATION

NOTICE

L12F022

Cabinet air leakage is less than 2% at 1.0 in. W.C. Cabinet air leakage is less than 1.4% at 0.5 in. W.C. when tested in accordance with ASHRAE Standard 193.

440 01 4005 05 21

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

UPFLOW INSTALLATION

NOTE: The furnace must be pitched as shown in Figure 19 for

proper condensate drainage.

Figure 19 Furnace Pitch Requirements

LEVEL 0-IN. (0 MM) TO 1/2-IN. (13 MM) MAX

MIN 1/4-IN. (6 MM) TO 1/2-IN. (13 MM) MAX

UPFLOW OR DOWNFLOW

HORIZONTAL

A11237

Supply Air Connections

Connect supply−air duct to flanges on furnace supply−air outlet. Bend flange upward to 90_ with wide duct pliers. (See Figure 24) The supply−air duct must be connected to ONLY the furnace supply−outlet−air duct flanges or air conditioning coil casing (when used). DO NOT cut main furnace casing side to attach supply air duct, humidifier, or other accessories. All supply−side accessories MUST be connected to duct external to furnace main casing.

Return Air Connections

Figure 20 Removing Bottom Closure Panel

BOTTOM

SCREWS (2)

Representative drawing only,

some models may vary in appearance.

1. Lay furnace on the back or side

2. Remove the two (2) screws that secure the bottom closure panel to the furnace casing and remove the panel

Figure 21

Removing Bottom Plate and Closure Panel

CLOSURE

A170123

FIRE HAZARD

A failure to follow this warning could cause personal injury, death and/or property damage.

Never connect return−air ducts to the back of the furnace. Follow instructions below.

The return−air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing. Bypass humidifier may be attached into unused return air side of the furnace casing. (See Figure 29, Figure 30, and

Figure 31)

WARNING

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return−air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, see Figure 21 and Figure 20.

SCREWS (4)

BOTTOM PLATE

Representative drawing only,

some models may vary in appearance.

1. Lay furnace on the back or side

2. Remove the four (4) screws that secure the bottom plate to the furnace casing

3. Remove the bottom closure from the casing

4. Re−install the bottom plate to the furnace casing and re−install the four (4) screws

A170124

Side Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return−air opening. This panel MUST be in place when only side return air is used. Where required by code, seal bottom closure to furnace with tape, mastic or other durable sealing method.

NOTE: Side return−air openings can be used in UPFLOW and most HORIZONTAL configurations. Do not use side return−air openings in DOWNFLOW configuration. (See Figure 29,

Figure 30, and Figure 31)

22 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Leveling Legs (If Desired)

In upflow position with side return inlet(s), leveling legs may be used. (See Figure 22) Install field−supplied, 5/16 x 1−1/2−in. (8 x 38 mm) (max) corrosion−resistant machine bolts, washers and nuts.

Figure 22 Leveling Legs

A89014

NOTE: Bottom closure must be used when leveling legs are used. It may be necessary to remove and reinstall bottom closure panel to install leveling legs. To remove bottom closure panel, see Figure 21 and Figure 20.

To install leveling legs:

1. Position furnace on its back. Locate and drill a hole in each bottom corner of furnace.

2. For each leg, install nut on bolt and then install bolt with nut in hole. (Install flat washer if desired.)

3. Install another nut on other side of furnace base. (Install flat washer if desired.)

4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement.

5. Reinstall bottom closure panel if removed.

DOWNFLOW INSTALLATION

NOTE: The furnace must be pitched as shown in Figure 19 for

proper condensate drainage.

Supply Air Connections

NOTE: For downflow applications, this furnace is approved for

use on combustible flooring when any one of the following two accessories are used (see specification sheets for list of approved accessories):

 Special Base − NAHA01101SB  Cased Coil Assembly − EAM4X, END4X, ENW4X,

EAD4X

1. Determine application being installed from Table 5.

2. Construct hole in floor per Table 5 and Figure 23.

3. Construct plenum to dimensions specified in Table 5 and Figure 23.

4. Install as shown in Figure 25. If Coil Assembly Part is used, install as shown in Figure 26 .

Figure 23

NOTE: It is recommended that the perforated supply−air duct

flanges be completely removed from furnace when installing the furnace on a factory−supplied cased coil or coil box. To remove the supply−air duct flange, use wide duct pliers or hand seamers to bend flange back and forth until it breaks off. Be careful of sharp edges. (See Figure 24)

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 protective clothing, safety glasses and gloves when handling parts, and servicing furnaces.

Connect supply−air duct to supply−air outlet on furnace. Bend flange inward past 90_ with wide duct pliers (See Table 1 Figure 24) The supply−air duct must be connected to ONLY the furnace supply outlet or air conditioning coil casing (when used). When installed on combustible material, supply−air duct must be connected to ONLY the factory−approved accessory subbase, or a factory−approved air conditioning coil casing. DO NOT cut main furnace casing to attach supply air duct, humidifier, or other accessories. All supply−side accessories MUST be connected to duct external to furnace casing.

Floor and Plenum Opening Dimensions

A96283

CAUTION

Return Air Connections

FIRE HAZARD

A failure to follow this warning could cause personal injury, death and/or property damage.

Never connect return−air ducts to the back of the furnace. Follow instructions below.

The return−air duct must be connected to return−air opening (bottom inlet) as shown in Figure 29. DO NOT cut into casing sides (left or right). Bypass humidifier connections should be made at ductwork or coil casing sides exterior to furnace. (See

Figure 29)

WARNING

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return−air opening. Remove and discard this panel

440 01 4005 05 23

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

when bottom return air is used. To remove bottom closure panel, see Figure 21 and Figure 20.

HORIZONTAL INSTALLATION

NOTE: The furnace must be pitched forward as shown in Figure 19 for proper condensate drainage.

FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING HAZARD

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

MINOR PROPERTY HAZARD

Failure to follow this caution may result in minor property damage.

Local codes may require a drain pan under entire furnace and condensate trap when a condensing furnace is used in an attic application or over a finished ceiling.

WARNING

CAUTION

The furnace can be installed horizontally in an attic or crawlspace on either the left−hand (LH) or right−hand (RH) side. The furnace can be hung from floor joists, rafters or trusses or installed on a non−combustible platform, blocks, bricks or pad.

Suspended Furnace Support

The furnace may be supported under the entire length of the furnace with threaded rod and angle iron. (See Figure 27) Secure angle iron to bottom of furnace as shown.

Platform Furnace Support

Construct working platform at location where all required furnace clearances are met. (See Table 1 and Figure 28) For furnaces with 1−in. (25 mm) clearance requirement on side, set furnace on non−combustible blocks, bricks or angle iron. For crawlspace installations, if the furnace is not suspended from the floor joists, the ground underneath furnace must be level and the furnace set on blocks or bricks.

Figure 24 Duct Flanges

PERFORATED DISCHARGE DUCT FLANGE

UPFLOW DOWNFLOW HORIZONTAL

120°

MIN

90°

YES

120°

MIN

YES

120° MIN

90°

YES

A10493

24 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 5 Opening Dimensions − in. (mm)

FURNACE

CASING WIDTH

IN. (mm)

14–3/16

(360)

17–1/2

(445)

(533)

24−1/2

(622)

APPLICATION

Upflow Applications on Combustible or Noncombustible Flooring

(subbase not required)

Downflow Applications on Noncombustible Flooring

(subbase not required)

Downflow applications on combustible flooring (subbase required)

Downflow Applications on Combustible Flooring with Coil Assembly or

coil box (subbase not required)

Upflow Applications on Combustible or Noncombustible Flooring

(subbase not required)

Downflow Applications on Noncombustible Flooring

(subbase not required)

Downflow applications on combustible flooring (subbase required)

Downflow Applications on Combustible Flooring with Coil Assembly or coil

box (subbase not required)

Upflow Applications on Combustible or Noncombustible Flooring

(subbase not required)

Downflow Applications on Noncombustible Flooring

(subbase not required)

Downflow applications on combustible flooring

(subbase required)

Downflow Applications on Combustible Flooring with Coil Assembly or coil

box (subbase not required)

Upflow Applications on Combustible or Noncombustible Flooring

(subbase not required)

Downflow Applications on Noncombustible Flooring

(subbase not required)

Downflow applications on Combustible flooring

(subbase required)

Downflow Applications on Combustible Flooring with Coil Assembly or

coil box (subbase not required)

PLENUM OPENING FLOOR OPENING

A B C D

12−11/16

(322)

12−9/16

(319)

11−13/16

(284)

12−5/16

(319)

(406)

15−7/8

(403)

15−1/8

(384)

15−1/2

(394)

19−1/2

(495)

19−3/8

(492)

18−5/8

(473)

(483)

(584)

22−7/8

(581)

22−1/8

(562)

22−1/2

(572)

21−5/8

(549)

(483)

21−5/8

(549)

(483)

21−5/8

(549)

(483)

21−1/8

(537)

(483)

13−5/16

(338)

13−3/16

(335)

13−7/16

(341)

13−5/16

(338)

16−5/8

(422)

16−1/2

(419)

16−3/4

(425)

16−1/2

(419)

20−1/8

(511)

(508)

20−1/4

(514)

(508)

23−5/8

(600)

23−1/2

(597)

23−3/4

(603)

23−1/2

(597)

22−1/4

19−5/8

20−5/8

22−1/4

19−5/8

20−5/8

22−1/4

19−5/8

20−5/8

22−1/4

19−5/8

20−5/8

(565)

(498)

(600)

(508)

(565)

(498)

(600)

(508)

(565)

(498)

(600)

(508)

(565)

(498)

(600)

(508)

Figure 25

Furnace, Plenum, and Subbase Installed on a Combustible Floor

A96285

Figure 26

Furnace, Plenum, and Coil Assembly on a Combustible Floor

END4X, ENW4X

L11F104

440 01 4005 05 25

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 27 Suspended Furnace Installation

COMBUSTION-AIR PIPE (SEE VENTING SECTION)

2-IN.

(51 mm)

Install 12” x 22” (204 x 559 mm) sheet metal in front of and above the burner compartment area.

he sheet metal MUST extend above the furnace casing by 1-in. (25 mm with the door removed.

A 1-in. (25 mm) clearance minimum between top of furnace and combustible material is required.

he entire length of furnace must be supported when furnace is used in horizontal position to

ensure proper drainage.

NOTE: FURNACE SHOWN IS A DIRECT-VENT APPLICATION. REFER TO THE VENTING SECTION FOR ALLOWABLE VENT CONFIGURATIONS.

ROLLOUT PROTECTION REQUIRED

A150581

NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished

ceiling.

Figure 28 Working Platform for Attic Installation

COMBUSTION - AIR PIPE (SEE VENTING SECTION)

30 IN. (762 mm)

2-IN.

(51 mm)

MIN. WORK AREA

ROLLOUT PROTECTION REQUIRED

Install 12” x 22” (305x559 mm) sheet metal in front of burner compartment area. The sheet metal MUST extend underneath the furnace casing by 1-in. (25 mm) with the door removed. The bottom closure panel may be used for ame roll-out protection when bottom of furnace is used for return air connection.

A150580

NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished

ceiling.

26 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Roll−Out Protection

Provide a minimum 12−in. x 22−in. (305 x 559 mm) piece of sheet metal for flame roll−out protection in front of burner area for furnaces closer than 12−in. (305 mm) above the combustible deck or suspended furnaces closer than 12−in. (305mm) to joists. The sheet metal MUST extend underneath the furnace casing by 1−in. (25mm) with the door removed. The bottom closure panel may be used for flame roll−out protection when bottom of furnace is used for return air connection. See Figure 28 for proper orientation of roll−out shield.

Supply Air Connections

For a furnace not equipped with a cooling coil, the outlet duct shall be provided with a removable access panel. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the air stream. The cover attachment shall prevent leaks. Connect supply−air duct to flanges on furnace supply−air outlet. Bend flange upward to 90_ with wide duct pliers. (See Figure 24) The supply−air duct must be connected to ONLY the furnace supply−outlet−air duct flanges or air conditioning coil casing (when used). DO NOT cut main furnace casing side to attach supply air duct, humidifier, or other accessories. All supply−side accessories MUST be connected to duct external to furnace main casing.

Return Air Connections

The return−air duct may be connected to bottom of the furnace. The side of casing that faces downward may also be used for return air connection. A combination of the bottom and downward facing side may also be used. The upward facing side of the casing cannot be used as a return air connection. (See Figure 31)

Bottom Return Air Inlet

Side Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return−air opening. This panel MUST be in place when side return air inlet(s) are used without a bottom return air inlet. Not all horizontal furnaces are approved for side return air connections (See Figure 31) Where required by code, seal bottom closure to furnace with tape, mastic or other durable sealing method.

Filter Arrangement

FIRE, CARBON MONOXIDE AND POISONING HAZARD

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

Never operate a furnace without a filter or filtration device installed. Never operate a furnace with filter or filtration device access doors removed.

Furnaces shipped without a filter rack:

There are no provisions for an internal filter in these furnaces. An external filter rack is required and is purchased separately. A field supplied accessory air cleaner may also be used in place of the filter rack. For upflow applications, the filter can be installed on either side of the furnace, the bottom of the furnace or any combination of side and bottom of the furnace. (See Figure 30, Figure 33, and

Figure 32)

WARNING

For downflow applications, the filter rack (or field supplied accessory air cleaner) must only be connected to the bottom opening on the furnace (See Figure 29 and Figure 32 and Table 9). For horizontal applications, the filter rack (or field supplied accessory air cleaner) can be connected to the bottom opening on the furnace. For side return use in the horizontal position, refer to Figure 31. If both side and bottom openings are used in Figure 31, each opening used will require a filter. A filter rack or any field supplied accessory air cleaner can also be installed in the common return duct prior to entering the return air opening in any orientation. See Table 6 for recommended filter size details.

Table 6 Filter Size Information − in. (mm)

FURNACE

CASING

WIDTH

14-3/16

(360)

17-1/2

(445)

(533)

24-1/2

(622)

* Recommended to maintain air filter face velocity. See Product Data for part number.

Refer to the instructions supplied with the Filter Rack or accessory air filter for additional assembly and installation options.

SIDE RETURN

16 x 25 x 3/4

(406 x 635 x 19)

16 x 25 x 3/4

(406 x 635 x 19)

16 x 25 x 3/4

(406 x 635 x 19)

16 x 25 x 3/4

(406 x 635 x 19)

FILTER SIZE

14 x 25 x 3/4

(356 x 635 x 19)

16 x 25 x 3/4

(406 x 635 x 19)

20 x 25 x 3/4

(508 x 635 x 19)

24 x 25 x 3/4

(610 x 635 x 19)

BOTTOM RETURN

FILTER

TYPE

Washable*

Filter and Return Duct Sizing

Pressure drop must be taken into account when sizing filters, filter racks, IAQ devices, and associated system ductwork. See Table 7 for a comparison of Pressure Drop (initial/clean resistance to airflow) versus Airflow for a variety of filter media types and sizes. These are representative numbers. Consult the filter or IAQ device manufacturers’ specification sheet for performance data for a particular filter media or IAQ device. Design the filter and associated ductwork for the best match of pressure drop versus filter size. Best practice usually chooses filter systems with pressure drops under 0.2 in. w.c. (50 Pa), with the best blower electrical efficiency and system airflow performance occurring with filter pressure drops under 0.1 in. w.c. (25 Pa). Due to the relatively high pressure drops of 1-in (25 mm) thick after-market filter media, it is recommended that the filtration system be designed for at least 2-in (51 mm) thick media.

TIPS FROM CONTRACTORS: Install a media cabinet capable

of incorporating a 4-in (102 mm) thick media filter. This allows room for future upgrades to other IAQ devices.

NOTICE

Design the duct system FIRST to determine how much pressure drop may be allowed in the filter system. See the AIR DUCTS section. Excessive filter pressure drop often compromises system airflow and duct performance, causes inadequate airflow to the furthest ends of the duct system, as well as causes excess noise and higher than anticipated electrical consumption.

Provide duct transitions, as required, to smoothly transition airflow from the return duct system to the filter (or IAQ device) to the furnace when the dimensions of the ductwork or furnace return air opening do not match the required filter or IAQ device dimensions. See the instructions supplied with factory-accessory duct adapters.

440 01 4005 05 27

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 7 Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa)

Factory-Accy

14 x 25 Filter

CFM L/s (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)

600 (283) 0.04 (12) 0.07 (17) 0.10 (26) 0.24 (60) 0.16 (40)

800 (378) 0.06 (15) 0.10 (25) 0.15 (39) 0.34 (85) 0.23 (59) 1000 (472) 0.07 (18) 0.13 (34) 0.21 (52) - - 0.32 (81) 1200 (566) 0.08 (20) 0.17 (43) 0.27 (68) - - - -

16x 25 Filter

CFM L/s (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)

600 (283) 0.04 (10) 0.06 (15) 0.09 (22) 0.20 (51) 0.13 (34)

800 (378) 0.05 (13) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49) 1000 (472) 0.06 (16) 0.11 (28) 0.17 (43) - - 0.27 (67) 1200 (566) 0.07 (18) 0.14 (36) 0.22 (56) - - - 1400 (661) 0.08 (21) 0.18 (45) 0.28 (70) - - - 1600 (755) 0.09 (23) 0.21 (54) - - - - - 1800 (850) 0.10 (25) 0.26 (64) - - - - - -

20 x 25 Filter

CFM (L/s) (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)

800 (378) 0.04 (11) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37) 1000 (472) 0.05 (13) 0.08 (21) 0.13 (32) 0.29 (72) 0.20 (49) 1200 (566) 0.06 (15) 0.11 (27) 0.16 (41) - - 0.25 (63) 1400 (661) 0.07 (17) 0.13 (33) 0.20 (51) - - 0.31 (79) 1600 (755) 0.08 (19) 0.16 (40) 0.24 (61) - - - 1800 (850) 0.08 (21) 0.18 (47) 0.29 (73) - - - 2000 (944) 0.09 (23) 0.21 (54) - - - - - 2200 (1038) 0.09 (24) 0.25 (62) - - - - - -

25 x 25 Filter

CFM L/s (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)

800 (378) 0.03 (9) 0.05 (12) 0.07 (18) 0.17 (43) 0.11 (28) 1000 (472) 0.04 (11) 0.06 (16) 0.09 (24) 0.22 (55) 0.15 (37) 1200 (566) 0.05 (13) 0.08 (20) 0.12 (31) 0.27 (68) 0.18 (47) 1400 (661) 0.06 (15) 0.10 (24) 0.15 (38) - - 0.23 (58) 1600 (755) 0.06 (16) 0.11 (29) 0.18 (45) - - 0.28 (69) 1800 (850) 0.07 (18) 0.13 (34) 0.21 (53) - - - 2000 (944) 0.08 (19) 0.16 (39) 0.24 (61) - - - 2200 (1038) 0.08 (21) 0.18 (45) 0.28 (70) - - - -

* Representative estimates from filter manufacturer data sheets.

Washable

Factory-Accy

Washable

Factory-Accy

Washable

Factory-Accy

Washable

See manufacturers’ specifications for pressure drop versus airflow data for specific filter media.

If the filter size that you are looking for is not contained in Table 7, refer to Table 8 for a comparison of Pressure Drop (initial/clean resistance to airflow) versus Face Velocity for a variety of filter media types.

The following equations relate Face Velocity (FPM), Filter Area and Airflow (CFM):

Filter Face Velocity = Airflow / Filter Area Minimum Filter Area = Rated System Airflow / Maximum Filter Face Velocity

Representative After-Market Filter Media*

Fiberglass* Pleated*

Representative After-Market Filter Media*

Fiberglass* Pleated*

Representative After-Market Filter Media*

Fiberglass* Pleated*

Representative After-Market Filter Media*

Fiberglass* Pleated*

Table 8 Filter Media Pressure Drop (Clean) Versus Velocity - in. w.c. (Pa)

Factory-Accy

Face Velocity

FPM (m/s) (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm)

200 (1) 0.04 (10) 0.05 (13) 0.08 (20) 0.18 (47) 0.12 (31)

300 (1.5) 0.05 (14) 0.09 (22) 0.13 (34) 0.30 (75) 0.21 (52)

400 (2) 0.07 (17) 0.13 (32) 0.20 (50) - - 0.31 (78)

500 (2.5) 0.08 (21) 0.18 (44) 0.27 (69) - - - -

600 (3) 0.09 (23) 0.23 - - - - - - -

700 (3.6) 0.10 (26) 0.29 - - - - - - -

* Representative estimates from filter manufacturer data sheets.

Washable

Fiberglass* Pleated*

See manufacturers’ specifications for pressure drop versus airflow data for specific filter media.

Representative After-Market Filter Media*

28 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 29

Figure 30

Downflow Return Air Configurations and Restrictions

L10F033

Upflow Return Air Configurations and Restrictions

External Filter Cabinet Configurations

Figure 32 Accessory Bottom Filter Rack

L10F031

Figure 31

HORIZONTAL TOP RETURN NOT PERMITTED FOR ANY MODEL

SIDE RETURN AIR NOT PERMITTED FOR 2000 CFM AND

Horizontal Return Air Configurations and Restrictions

ABOVE OF AIR FLOW

L10F032

L10F034

22−5/16

(566.4)

28−7/16

(722.2)

2−3/16

(55.5)

Table 9 Dimensional Drawing − in. (mm)

KIT NO.

NAHB00501FF

NAHB00601FF

NAHB00701FF

NAHB00801FF

FURNACE

WIDTH

14−3/16

(360.4)

17−1/2

(444.5)

(533.4)

24−1/2

(622.3)

A B

11−3/8

(289)

14−5/8 (371.5)

18−1/8 (460.4)

21−5/8 (549.3)

14−1/4

(362)

17−5/8 (447.7)

21−1/8 (536.6)

24−5/8 (625.5)

440 01 4005 05 29

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 33 Accessory Side Filter Rack

FURNACE

FILTER FRAME

FILTER

TABS

DOOR

⅜” (1 cm)

TABS

½” (1.3 cm)

14 ½” (37 cm)

OPENING

17 ⅛” (43.5 cm)

1 ¼” (3 cm)

(TYP.)

(3 cm)

25 ⅛”

4”

(64 cm)

23 ⅛” (59 cm)

OPENING

¾”

(2 cm)

16 ⅛” (41 cm)

L10F027

2 ⅜” (6 cm)

your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in the Service and Technical Support Manual. When a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

Secure ductwork with proper fasteners for type of ductwork used. Seal supply− and return−duct connections to furnace with code approved tape or duct sealer.

NOTE: Flexible connections should be used between ductwork and furnace to prevent transmission of vibration.

Ductwork passing through unconditioned space should be insulated to enhance system performance. When air conditioning is used, a vapor barrier is recommended.

Maintain a 1−in. (25 mm) clearance from combustible materials to supply air ductwork for a distance of 36−in. (914 mm) horizontally from the furnace. See current edition of the NFPA 90B or local code for further requirements.

Return Duct Sizing

Refer to the Filter Selection and Duct Sizing section for information on the proper selection of filter sizes and the associated ductwork and duct transitions. Improperly designed filtering systems and return ductwork are the most common causes of airflow and/or noise complaints in HVAC systems.

Ductwork Acoustical Treatment

NOTE: Metal duct systems that do not have a 90 degree elbow

and 10 ft. (3 M) of main duct to the first branch take−off may require internal acoustical lining. As an alternative, fibrous ductwork may be used if constructed and installed in accordance with the latest edition of SMACNA construction standard on fibrous glass ducts. Both acoustical lining and fibrous ductwork shall comply with current edition of the NFPA 90B as tested by UL Standard 181 for Class 1 Rigid air ducts.

NOTE: For horizontal applications, the top most flange may be bent past 90_ to allow the evaporator coil to hang on the flange temporarily while the remaining attachment and sealing of the coil are performed.

L12F023

Air Ducts

GAS PIPING

WARNING

FIRE OR EXPLOSION HAZARD

NOTICE

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

Many states, provinces and localities are considering or have implemented standards and/or restrictions on duct sizing practices, ductwork leakage, and/or ductwork thermal, airflow and electrical efficiencies. CONSULT LOCAL CODE OFFICIALS for ductwork design and performance requirements in your area.

Never purge a gas line into a combustion chamber. 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. A fire or explosion may result causing property damage, personal injury or loss of life.

General Requirements

The duct system should be designed and sized according to accepted national standards such as those published by: Air Conditioning Contractors Association (ACCA Manual D), Sheet Metal and Air Conditioning Contractors National Association (SMACNA) or American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) or consult The Air Systems Design Guidelines reference tables available from

30 440 01 4005 05

Specifications subject to change without notice.

FIRE OR EXPLOSION HAZARD

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

Use proper length of pipe to avoid stress on gas control manifold and a gas leak.

WARNING

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

WARNING

FIRE OR EXPLOSION HAZARD

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

Gas valve inlet and/or inlet pipe must remain capped until gas supply line is permanently installed to protect the valve from moisture and debris. Also, install a sediment trap in the gas supply piping at the inlet to the gas valve.

Gas piping must be installed in accordance with national and local codes. Refer to current edition of the NFGC in the U.S.A. Refer to current edition of the CAN/CSA B149.1 in Canada.

Installations must be made in accordance with all authorities having jurisdiction. If possible, the gas supply line should be a separate line running directly from meter to furnace.

NOTE: Use a back−up wrench on the inlet of the gas valve when connecting the gas line to the gas valve.

NOTICE

In the state of Massachusetts:

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

2. When flexible connectors are used, the maximum length shall not exceed 36−in. (915 mm).

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

4. The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

Table 10 Maximum Capacity of Pipe

NOMINAL

IRON PIPE

SIZE

IN. (MM)

1/2 (13)

3/4 (19)

1 ( 25)

1‐1/4 (32)

1‐1/2 (39)

* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-In. W.C.) or less and a pressure drop of 0.5-In. W.C. (based on a 0.60 specific gravity gas). Ref: Table 10 above, and 6.2 of current edition of the NFPA54/ANSI Z223.1.

An accessible manual equipment shutoff valve MUST be installed external to furnace casing and within 6 ft. (1.8 M) of furnace.

Install a sediment trap externally in riser leading to furnace as shown in Figure 34. Connect a capped nipple into lower end of tee. Capped nipple should extend below level of furnace gas controls. Place a ground joint union between furnace gas control valve and exterior manual equipment gas shutoff valve.

INTERNAL

DIA.

IN. (MM)

0.622 (158) 175 120 97 82 73

0.824 (20.9) 360 250 200 170 151

1.049 (26.6) 680 465 375 320 285

1.380 (35.0) 1400 950 770 660 580

1.610 (40.9) 2100 1460 1180 990 900

LENGTH OF PIPE − FT (M)

(3.0)20(6.0)30(9.1)40(12.1)50(15.2)

Figure 34 Typical Gas Pipe Arrangement

Refer to Table 10 for recommended gas pipe sizing. Risers must be used to connect to furnace and to meter. Support all gas piping with appropriate straps, hangers, etc. Use a minimum of one hanger every 6 ft. (1.8 M). Joint compound (pipe dope) should be applied sparingly and only to male threads of joints. Pipe dope must be resistant to the action of propane gas.

WARNING

FIRE OR EXPLOSION HAZARD

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

If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector which has previously served another gas appliance. Black iron pipe shall be installed at the furnace gas control valve and extend a minimum of 2−in. (51 mm) outside the furnace.

CAUTION

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in furnace damage.

Connect gas pipe to furnace using a backup wrench to avoid damaging gas controls and burner misalignment.

L10F030

A 1/8−in. (3 mm) NPT plugged tapping, accessible for test gauge connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual equipment shutoff valve.

Piping should be pressure and leak tested in accordance with the current addition of the NFGC in the United States, local, and national plumbing and gas codes before the furnace has been connected. Refer to current edition of the NSCNGPIC in Canada. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.

NOTE: The furnace gas control valve inlet pressure tap connection is suitable to use as test gauge connection providing test pressure DOES NOT exceed maximum 0.5 psig (14−in. w.c.) stated on gas control valve. (See Figure 35)

440 01 4005 05 31

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 35 Gas Valves

Automatic Gas Valve (Two−Stage)

ON/OFF Switch

1/2” NPT Inlet

1/8” NPT Inlet Pressure Tap

Representative drawing only, some models may vary.

Gas Valve (Single Stage)

ON/OFF Switch

1/2” NPT Inlet

Regulator Seal Cap

Regulator Adjustment Regulator Seal Cap under Cap

1/8” NPT Manifold Pressure Tap

Regulator Seal Cap

Regulator Adjustment Regulator Seal Cap under Cap

1/2” NPT Outlet

A11152

If pressure exceeds 0.5 psig (14−in. w.c.), gas supply pipe must be disconnected from furnace and capped before and during supply pipe pressure test. If test pressure is equal to or less than 0.5 psig (14−in. w.c.), turn off electric shutoff switch located on furnace gas control valve and accessible manual equipment shutoff valve before and during supply pipe pressure test. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.

The gas supply pressure shall be within the maximum and minimum inlet supply pressures marked on the rating plate with the furnace burners ON and OFF.

Gas entry can be from left or right side, or top panel. (See

Figure 36 and Figure 37)

Gas Pipe Grommet

For direct vent (2-pipe) applications, the knockout for the gas pipe must be sealed to prevent air leakage. Remove the knockout, install the grommet in the knockout, then insert the gas pipe. The grommet is included in the loose parts bag. (See

Figure 36)

Figure 36 Gas Entry

Left Side Gas Entry. Gas Pipe Grommet Required For Direct Vent Applications.

Gas Pipe Grommet Required For Direct Vent Applications

1/8” NPT Inlet Pressure Tap

1/8” NPT Manifold Pressure Tap

Representative drawing only, some models may vary.

1/2” NPT Outlet

A11153

A11338

Figure 37 Alternate Gas and Electric Entry

1ï1/2 inch for Gas

7/8 inch for 115 VAC Electric

NOTE: Top plate may be field drilled for alternate gas and 115 VAC electric entry

L170125

32 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

ELECTRICAL CONNECTIONS

WARNING

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage.

S Before servicing, disconnect all electrical power to

furnace.

S When servicing controls, label all wires prior to dis-

connecting. Reconnect wires correctly.

S Verify proper operation after servicing. S Always reinstall access doors after completing

service and maintenance.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death. Blower door switch opens 115−v power to control. No component operation can occur. Do not bypass or close switch with blower door removed.

See Figure 38 for field wiring diagram showing typical field 115 −v wiring. Check all factory and field electrical connections for tightness.

Field−supplied wiring shall conform with the limitations of 63°F (33°C) rise.

WARNING

115−V Wiring

Furnace must have a 115-v power supply properly connected and grounded.

NOTE: Proper polarity must be maintained for 115-v wiring. If polarity is incorrect, control status indicator light flashes rapidly and furnace does NOT operate.

Verify that the voltage, frequency, and phase correspond to that specified on unit rating plate. Also, check to be sure that service provided by utility is sufficient to handle load imposed by this equipment. Refer to rating plate or Table 11 for equipment electrical specifications.

U.S.A. Installations: Make all electrical connections in accordance with the current edition of the National Electrical Code (NEC) NFPA 70 and any local codes or ordinances that might apply.

Canadian Installations: Make all electrical connections in accordance with the current edition of the Canadian Electrical Code CSA C22.1 and any local codes or ordinances that might apply.

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, or property damage. Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire.

WARNING

ELECTRICAL SHOCK AND FIRE HAZARD

Failure to follow this warning could result in personal injury, death, or property damage. The cabinet MUST have an uninterrupted or unbroken ground according to current edition of the NEC NFPA 70 or local codes to minimize personal injury if an electrical fault should occur. In Canada, refer to current edition of the Canadian Electrical Code CSA C22.1. This may consist of electrical wire, conduit approved for electrical ground or a listed, grounded power cord (where permitted by local code) when installed in accordance with existing electrical codes. Refer to the power cord manufacturer’s ratings for proper wire gauge. Do not use gas piping as an electrical ground.

FURNACE MAY NOT OPERATE HAZARD

Failure to follow this caution may result in intermittent furnace operation. Furnace control must be grounded for proper operation or else control will lock out. Control must remain grounded through green/yellow wire routed to gas valve and manifold bracket screw.

WARNING

CAUTION

SWITCH

Use a separate, fused branch electrical circuit with a properly sized fuse or circuit breaker for this furnace. See Table 11 for wire size and fuse specifications. A readily accessible means of electrical disconnect must be located within sight of the furnace.

COPPER

WIRE ONLY

ALUMINUM

WIRE

A11146

440 01 4005 05 33

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 38 Heating and Cooling Application Single−Stage Wiring Diagram

FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING

FIVE WIRE

THREE-WIRE

HEATING-ONLY

BLOWER DOOR SWITCH

BLK

WHT

115-V FIELD-

SUPPLIED

BLK

WHT

GND

AUXILIARY J-BOX

DISCONNECT

GND

NOTE 2

N T

COM

24-V

TERMINAL

WCR GY

NOTE 1

THERMOSTAT TERMINALS

CONDENSING UNIT

TWO WIRE

FIELD-SUPPLIED DISCONNECT

GND

208/230- OR 460-V THREE PHASE

208/230-V SINGLE PHASE

BLOCK

FURNACE

NOTES: Connect Y-terminal in furnace as shown for proper blower operation.

Some thermostats require a "C" terminal connection as shown.

If any of the original wire, as supplied, must be replaced, use same type or equivalent wire.

Heating and Cooling Application Two−Stage Wiring Diagram with Single−Stage Thermostat

A11387

BLOWER

DOOR

SWITCH

BLK

WHT

115 ïVOLT FIELDï

SUPPLIED

FUSED

DISCONNECT

BLK

WHT

GND

J−Box Installation

WARNING

THREEïWIRE

HEATINGï

ONLY

JUNCTION BOX

FURNACE

FIVE

WIRE

COM

O N

W/W1

Y/Y2

R O

24ïVOLT

TERMINAL

BLOCK

NOTE 2

NOTE 1

NOTES: 1.

FIELD 24ïVOLT WIRING FIELD 115ï, 208/230ï, 460ïVOLT WIRING FACTORY 24ïVOLT WIRING FACTORY 115ïVOLT WIRING

1ïSTAGE

THERMOSTAT TERMINALS

CONDENSING

UNIT

Connect Y/Y2ïterminal as shown for proper operation. Some thermostats require a ”C” terminal connection as shown.

2. If any of the original wire, as supplied, must be replaced, use

3. same type or equivalent wire.

FIELDïSUPPLIED

FUSED DISCONNECT

GND

208/230ï OR 460ïVOLT THREE PHASE

208/230ï VOLT SINGLE PHASE

A11401

FIRE OR ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury, death, or property damage. High voltage field connections must be located in J−Box with furnace, or in field supplied external disconnect mounted to furnace. If field−supplied manual disconnect switch is to be mounted on furnace casing side, select a location where a drill or fastener cannot damage electrical or gas components.

34 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 39 Optional J−Box Locations

OPTIONAL J−BOX LOCATIONS

Representative drawing only, some models may vary in appearance.

L12F024

Figure 40 J−Box Bracket Installation

J−BOX MOUNTING SCREWS, BLUNT−TIP

J−BOX MOUNTING BRACKET

GROUND SCREW

J−BOX COVER

A170137

The J−Box must be used when field line voltage electrical connections are made to the furnace wiring harness inside the furnace casing. The J−Box cover is not required if an external electrical box is attached to the outside of the furnace casing. The field wiring and main wiring harness are grounded with the furnace box is grounded to the green ground screw of the J−Box bracket and the earth ground of the field electrical supply. The field ground wire and furnace main ground wire are grounded when the J−Box bracket is attached to the furnace and the field ground wire and factory ground wire are secured to the bracket grounding screw. If the J−Box cover is not used, the field and factory spliced connections must be located inside the external electrical box. Do not leave splice connections unprotected inside the furnace.

The J−Box cover, mounting bracket and screws are shipped in the loose parts bag included with the furnace. See Figure 39 for J−Box mounting locations.

The J−Box mounting bracket and green ground screw are used as a grounding point for all line voltage wiring options. The J−Box cover may be omitted when electrical connections are made inside an external electrical box mounted external to the casing.

External Electrical Box on Furnace Casing

Note: Check to ensure that external electrical box does not interfere with ductwork, gas piping or the indoor coil drain. See Figure 37 for alternate electric entry through top panel.

1. Select and remove 7/8−in. (22 mm) knock−out on the desired side of the casing. Remove the knock−out from the casing.

NOTE: If electrical entry through the furnace top panel is used, a 7/8−in. (22 mm) hole must be drilled through the top panel.

2. Drill two (2) 1/8−in. (3 mm) pilot holes through the dimples in the furnace casing near the 7/8−in. knock−out.

NOTE: If electrical entry through the furnace top panel is used, mark the screw hole locations using the mounting holes in the external electrical box as a template.

For a side−mounted external electrical box, complete the following:

3. Align the J−Box bracket with the knock−out inside the furnace casing.

4. Install the threaded end of a strain−relief bushing through the J−Box bracket and the furnace casing. Strain−relief bushing should be installed so that the bushing can be tightened around the wiring harness inside the furnace casing.

5. Align the field−supplied external electrical box with the 7/8−in. (22 mm) knock−out.

6. Install and tighten the lock−nut on the strain−

relief

bushing inside the external electrical box.

7. Fasten the external electrical box to the furnace casing using two (2) sheet metal screws.

8. Route field power wiring into external electrical box.

9. Pull furnace line voltage power wires through strain−relief bushing of the external electrical box.

10. Pull the ground wire of the field line voltage wiring through the strain−relief bushing into the furnace casing.

11. Install the green ground screw to the J−Box bracket and attach both ground wires to the green ground screw.

12. Connect any code required external disconnect(s) to field power wiring.

13. Connect field power and neutral leads to furnace power leads inside the external electrical box as shown in

Figure 40.

For a top panel−mounted external electrical box, complete the following:

1. Drill two (2) 1/8−in. (3 mm) pilot holes through the dimples in the furnace casing near the 7/8−in. knock−out on the side of the casing. Do not remove the knock−out in the side of the casing.

2. Align the J−Box bracket with the pilot holes inside the furnace casing.

3. Install two (2) screws through the outside of the casing to secure the J−Box bracket to the furnace casing.

4. Route field power wiring into external electrical box.

5. Pull furnace line voltage power wires through strain−relief bushing of the external electrical box.

6. Pull the ground wire of the field line voltage wiring through the strain−relief bushing into the furnace casing.

7. Install the green ground screw to the J−Box bracket and attach both ground wires to the green ground screw.

440 01 4005 05 35

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

8. Connect any code required external disconnect(s) to field power wiring.

9. Connect field power and neutral leads to furnace power leads inside the external electrical box as shown in

Figure 41.

Figure 41

Field−Supplied External Electrical Box on Furnace Casing

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON MONOXIDE POISONING HAZARD

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

Do no drill into blower shelf of furnace to route control wiring. Route any control or accessory wiring to the blower compartment through external knockouts on the casing.

! WARNING

24−V Wiring

Make field 24−V connections at the 24−V terminal strip. (See

GROUND

NEUTRAL

LINE VOLTAGE

Figure 43 or Figure 44) Connect terminal Y/Y2 as shown in Figure 38 for proper cooling operation. Use only AWG No. 18,

color−coded, copper thermostat wire. NOTE: Use AWG No. 18 color-coded copper thermostat wire for lengths up to 100 ft. (30.5 M). For wire lengths over 100 ft., use AWG No. 16 wire. The 24−v circuit contains an automotive−type, 3−amp. fuse located on the control. Any direct shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3−amp. fuse of identical size. (See Figure 43 or Figure 44)

See the Service and Technical Support manual for detailed instructions on control wiring and setup.

Thermostats and Control Settings for (F/G)9MXT Two−Stage Furnaces

A10141

Power Cord Installation in Furnace J−Box

NOTE: Power cords must be able to handle the electrical

requirements listed in Table 11. Refer to power cord manufacturer’s listings.

1. Install J−Box mounting bracket to inside of furnace casing. (See Figure 40)

2. Route listed power cord through 7/8−in. (22 mm) diameter hole in casing and J−Box bracket.

3. Secure power cord to J−Box bracket with a strain relief bushing or a connector approved for the type of cord used.

4. Pull furnace power wires through 1/2−in. (12 mm) diameter hole in J−Box. If necessary, loosen power wires from strain—relief wire−tie on furnace wiring harness.

5. Connect field ground wire and factory ground wire to green ground screw on J−Box mounting bracket as shown in Figure 40.

6. Connect power cord power and neutral leads to furnace power leads as shown in Figure 38.

7. Attach furnace J−Box cover to mounting bracket with screws supplied in loose parts bag. Do not pinch wires between cover and bracket.

BX Cable Installation in Furnace J−Box

1. Install J−Box mounting bracket to inside of furnace casing.

2. Route BX connector through 7/8−in. (22 mm) diameter hole in casing and J−Box bracket.

3. Secure BX cable to J−Box bracket with connectors approved for the type of cable used.

4. Connect field ground wire and factory ground wire to green ground screw on J−Box mounting bracket as shown in Figure 40.

5. Connect field power and neutral leads to furnace power leads. as shown in Figure 38.

6. Attach furnace J−Box cover to mounting bracket with screws supplied in loose parts bag. Do not pinch wires between cover and bracket.

36 440 01 4005 05

Specifications subject to change without notice.

A single−stage or two−stage heating and single−stage or two−stage cooling thermostat may be used with the furnace. Refer to typical thermostat wiring diagrams and the Sequence of Operation section of the Service and Technical Support manual for details on configuring the furnace control board. Consult the thermostat installation instructions for specific information about configuring the thermostat.

Thermostats and Control Settings for (F/G)9MXE Single−Stage Furnaces

A single stage heating and single−stage or two−stage cooling thermostat may be used with the furnace. Refer to typical thermostat wiring diagrams and the Sequence of Operation section of the Service and Technical Support manual for details on configuring the furnace control board. Consult the thermostat installation instructions for specific information about configuring the thermostat.

Accessories (See Figure 42, Figure 43, and/or

Figure 44)

1. Electronic Air Cleaner (EAC) Connect an accessory Electronic Air Cleaner (if used) using 1/4−in female quick connect terminals to the two male 1/4−in quick−connect terminals on the control board marked EAC−1 and EAC−2. The terminals are rated for 115VAC, 1.0 amps maximum and are energized during blower motor operation.

2. Humidifier (HUM) (F/G)9MXT There are two humidifier outputs on the furnace control. The 115 VAC HUM terminal is energized when the Induced Draft Relay closes. The 24 VAC HUM terminal is energized when the low pressure switch closes during a call for heat. Connect an accessory 115 VAC accessory humidifier to the HUM terminal and L2 on the furnace control. Connect a 24 VAC humidifier to the 24 VAC HUM terminal and C screw terminal strip on the control board thermostat strip. (See Figure 43) (F/G)9MXE The HUM 24 VAC terminal is a 24 VAC output energized when the gas valve relay closes during a call for heat.

NOTE: There is not a HUM 115V terminal on the single stage ECM furnace control board. Available ONLY on the two−stage ECM and PSC single−stage furnace control board.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Connect an accessory 24 VAC, 0.5 amp. Maximum (if used) to the 1/4−in. male quick−connect HUM 24 VAC terminal and C screw terminal on the control board thermostat strip. (See Figure 44)

Power from an alternate power supply that non-sinusoidal may damage the furnace or cause erratic furnace operation. Contact the alternate power supply manufacturer for specifications and details.

NOTE: If the humidifier has its own 24 VAC power supply, an isolation relay may be required. Connect the 24 VAC coil of the isolation relay to the HUM 24 VAC and C screw terminal on the control board thermostat strip. (See Figure 42)

Alternate Power Supplies

This furnace is designed to operate on a utility generated power which has a smooth sinusoidal waveform. If the furnace is to be operated on a generator or other alternate power supply, the alternate power supply must produce a smooth sinusoidal waveform for compatibility with furnace electronics. The alternate power supply must generate the same voltage, phase, and frequency (Hz) as shown in Table 11 or on the furnace rating plate.

Figure 42 Isolation Relay for Humidifiers with Internal Power Supply

To Humidifier Leads

24 V

Coil

To HUM 24 VAC Terminal

On Furnace Control Board

To Humidifier Leads

To Com/24V Screw Terminal

on Thermostat Strip

A11157

440 01 4005 05 37

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 11 Electrical Data

(F/G)9MXT TWO−STAGE, ECM BLOWER FURNACES

UNIT SIZE

VOLTS− HERTZ−

PHASE

OPERATING

VOLTAGE

RANGE*

Max* Min*

MAXIMUM

UNIT

AMPS

UNIT

AMPACITY#

MINIMUM

WIRE

SIZE AWG

MAXIMUM

WIRE

LENGTH

FT (M)}

MAXIMUM

FUSE OR CKT

BKR

AMPS{

0401410 115-60-1 127 104 7.5 10.3 14 36 (11.0) 15 0401712 115-60-1 127 104 7.5 10.3 14 36 (11.0) 15 0601412 115-60-1 127 104 7.6 10.4 14 35 (10.7) 15 0601714 115-60-1 127 104 10.7 14.3 14 26 (7.9) 15 0801716 115-60-1 127 104 10.1 13.5 14 27 (8.2) 15 0802120 115-60-1 127 104 13.1 17.3 12 33 (10.1) 20 1002120 115-60-1 127 104 13.5 17.7 12 32 (9.8) 20 1202422 115-60-1 127 104 12.0 15.9 12 36 (11.0) 20

(F/G)9MXE SINGLE−STAGE, ECM BLOWER FURNACES

UNIT SIZE

VOLTS− HERTZ−

PHASE

OPERATING

VOLTAGE

RANGE*

Max* Min*

MAXIMUM

UNIT

AMPS

UNIT

AMPACITY#

MINIMUM

WIRE

SIZE AWG

MAXIMUM

WIRE

LENGTH

FT (M)}

MAXIMUM

FUSE OR CKT

BKR

AMPS{

0261410 115-60-1 127 104 5.1 7.3 14 51 (15.5) 15 0401410 115-60-1 127 104 7.5 10.3 14 36 (11.0) 15 0401712 115-60-1 127 104 7.5 10.3 14 36 (11.0) 15 0601412 115-60-1 127 104 7.6 10.4 14 35 (10.7) 15 0601714 115-60-1 127 104 10.7 14.3 14 26 (7.9) 15 0801716 115-60-1 127 104 10.1 13.5 14 27 (8.2) 15 0802120 115-60-1 127 104 13.1 17.3 12 33 (10.1) 20 1002120 115-60-1 127 104 13.5 17.7 12 32 (9.8) 20 1202422 115-60-1 127 104 12.0 15.9 12 36 (11.0) 20

* Permissible limits of the voltage range at which the unit operates satisfactorily. # Unit ampacity = 125 percent of largest operating component’s full load amps plus 100 percent of all other potential operating components’ (EAC, humidifier, etc.) full load amps.

{ Time−delay type is recommended. } Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.

Figure 43 Example of Two−Stage Furnace Control for ECM Blower Motor − (F/G)9MXT

SET UP SWITCHES THERMOSTAT TYPE (TT) AND HEAT OFF−DELAY

W2 Y1 DHUM G COM W/W1 Y/Y2 R

24−V THERMOS TAT TERMINALS

SW1

OFF

3−AMP FUSE

LED OPERATION & DIAGNOSTIC LIGHT

COM

24V

BLOWER SPEED TERMINALS

115−VAC (L2) NEUTRAL CONNECTIONS

38 440 01 4005 05

Specifications subject to change without notice.

24V

COM

HI HT

COOL

LO H T

SPARE 2

SPARE 1

TEST / TWIN

24VAC

FUSE 3−AMP

COM/BLUE 24VAC/RED

24V MTR TAPS

EAC−2

TWINNING AND/OR

SW1

OFF

COMPONENT TEST

1 2 3

TERMINAL

OFF DLY

PLT

HUM

PL1

EAC TERMINAL 115 VAC 1.0 AMP MAX

EAC−1

L1 BL−1 XFMR

115 VAC LINE (L1) INPUT

HUMIDIFIER TERMINAL (24 VAC 0.5 AMPS MAX)

TRANSFORMER 24 VAC CONNECTIONS

P−1 LOW VOLTAGE

11 5 VA C BLOWER POWER (BL1) CONNECTION

HUM

115 VAC HUM

11 5 VA C TRANSFORMER PRIMARY

P2 − HOT SURFACE IGNITER/INDUCE R MOTOR CONNECTION

HSIR

HSI HI LO

IHI/LOR

IDM

IDR

PL2

L12F037

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 44 Example of Single Stage Furnace Control for ECM Blower Motor − (F/G)9MXE

HEAT OFFïDELAY

120 180

90 150

TWINNING AND/OR COMPONENT TEST TERMINAL

HUMIDIFIER TERMINAL (24ïVAC 0.5 AMP MAX)

TRANSFORMER 24VAC CONNECTIONS

P1 ï LOW VOLTAGE MAIN HARNESS CONNECTOR

24ïV THERMOSTAT

3ïAMP FUSE

LED OPERATION & DIAGNOSTIC LIGHT

BLOWER SPEED

SELECTION TERMINALS

TERMINALS

HEAT

COOL

FAN

SPARE2

SPARE1

Y1 DHUM

COM/BLUE

COM

HEAT

COOL

FAN

SPARE 2

SPARE 1

HUM

24VAC

24VAC/RED

24V MTR TAPS

EAC

NEUTRAL ï L2

115 ïVAC (L2) NEUTRAL

CONNECTIONS

115 VAC (L1) CONNECTIONS

VENTING

NOTE: Planning for the venting system should be done in

conjunction with planning for the ductwork, drainage, and furnace accessories, such as air cleaners and humidifiers. Begin assembling the venting system AFTER the furnace is set in place in the required orientation. Venting for this furnace shall follow all Local codes for category IV venting systems. This furnace is CSA approved for venting with PVC/ABS DWV venting systems. This furnace is also CSA approved for venting the M&G DuraVentr PolyPror polyproplylene venting systems. NOTE: THESE INSTRUCTIONS DO NOT CONTAIN DETAILED INSTALLATION INSTRUCTIONS FOR POLYPROPYLENE VENTING SYSTEMS. Refer to the polyproplylene venting system manufacturer’s installation instructions for the polyproplylene venting system installation. NOTE: When using polypropylene venting systems, all venting materials used, including the vent terminations, must be from the same manufacturer.

Special Venting Requirements for Installations in Canada

Installation in Canada must conform to the requirements of CAN/CSA B149 code. Vent systems must be composed of pipe, fittings, cements, and primers listed to ULC S636. The special vent fittings, accessory concentric vent termination kits, and accessory external drain trap available from the furnace manufacturer 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

440 01 4005 05 39

Specifications subject to change without notice.

1 AMP

XFMR

BLï1

EAC TERMINAL (115 VAC 1.0 AMP MAX.)

IND

HSI

P2ïHOT SURFACE IGNITOR (HSI) & INDUCER MOTOR (IND) CONNECTOR

L11F075

GVS-65 PVC Solvent Cement for Royal Pipe or IPEX System 636

t, PVC Cement for Flue Gas Venting, rated Class IIA, 65

(1)

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 CAN/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.

*IPEX System 636™ is a trademark of IPEX Inc.

Consignes spéciales pour l’installation de ventilation au Canada

L’installation faite au Canada doit se conformer aux exigences du code CAN/CSA B149. Ce systême de ventillation doit se composer de tuyaux, raccords, ciments et apprêts conformes au ULC S636. La tuyauterie de ventilation des gaz, ses accessoires, le terminal concentrique mural ainsi que l’ensemble du drain de condensation extérieur fourni par le fabricant de cette fournaise ont été certifiés ULC S636 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.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

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 CAN/CSA B149 est directement relié à l’installation conforme aux instructions ci- haut 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.

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. 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.

1. Seal any unused openings in venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required in the current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the CSA B149.1 Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.

4. Close fireplace dampers.

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

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

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

8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the current edition of 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

General

If this furnace replaces a furnace that was connected to a vent system or chimney, the vent or vent connectors of other remaining appliances may need to be re−sized. Vent systems or vent connectors of other appliances must be sized to the minimum size as determined using appropriate table found in the current edition of the National Fuel Gas Code NFPA 54/ANSI Z−223.1. In Canada, refer to CAN/CSA−B149.1

An abandoned masonry chimney may be used as a raceway for properly insulated and supported combustion−air (when applicable) and vent pipes. Each furnace must have its own set of combustion−air and vent pipes and be terminated individually, as shown in Figure 52 for Direct Vent (2−Pipe) system, or Figure 53 for single−pipe or ventilated combustion air option.

A furnace shall not be connected to a chimney flue serving a separate appliance designed to burn solid fuel. Other gas appliances with their own venting system may also use the abandoned chimney as a raceway providing it is permitted by local code, the current edition of the National Fuel Gas Code, and the vent or liner manufacturer’s installation instructions. Care must be taken to prevent the exhaust gases from one appliance from contaminating the combustion air of other gas appliances.

Do not take combustion air from inside the chimney when using ventilated combustion air or single−pipe vent option.

These furnaces can be vented as direct−vent (two−pipe), ventilated combustion air, or non-direct (single−pipe) vent system. Each type of venting system is described below. Common venting between these furnaces or other appliances is prohibited.

Materials

U.S.A.

Combustion air and vent pipe, fittings, primers, and solvents must conform to American National Standards Institute (ANSI) standards and American Society for Testing and Materials (ASTM) standards. See Table 13 for approved materials for use in the U.S.A. This furnace is also CSA approved for venting with M&G DuraVent® PolyPro® polyproplylene venting systems.

Canada

Installation in Canada must conform to the requirements of CAN/CSA B149 code. Vent systems must be composed of pipe, fittings, cements, and primers listed to ULC S636. M&G DuraVent PolyPro polyproplylene venting systems are ULC S636 listed.

NOTE: When using polypropylene venting systems, all venting materials used, including the vent terminations, must be from the same manufacturer.

Venting Systems

CARBON MONOXIDE POISONING HAZARD

Failure to follow the instructions outlined in Locating the Vent Termination for each appliance being placed into operation could result in carbon monoxide poisoning or death. For all venting configurations for this appliance and other gas appliances placed into operation for the structure, provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with: U.S.A. Installations: Current edition of Section 9.3 NFPA 54/ANSI Z223.1, Air for Combustion and Ventilation and applicable provisions of the local building codes. Canadian Installations: Current edition of Part 8 of CAN/CSA−B149.1. Venting Systems and Air Supply for Appliances and all authorities having jurisdiction.

WARNING

40 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 12

Direct Vent (2−Pipe)

Termination Kit

2−in (51 mm)

Concentric Vent Kit

3−in (76 mm)

Concentric Vent Kit

2−in (51 mm)

Termination Bracket

Kit

3−in (76 mm)

Termination Bracket

Vent Termination Kit for Direct

Vent (2−Pipe) Systems

Diam. Of

Combustion Air and

Vent Pipes

Termination System

Single Penetration of

Wall or Roof

Single Penetration of

Wall or Roof

2−Pipe Termination

System

2−Pipe Termination

System

in.(mm)

1, 1−1/2, 2, or 2−1/2

(25, 38, 51, 64 mm)

2−1/2, 3 or 4

(64, 76, 102 mm)

1, 1−1/2, 2, or 2−1/2

(25, 38, 51, 64 mm)

2−1/2, 3 or 4

(64, 76, 102 mm)

NOTICE

RECOMMENDED SUPPORT FOR VENT TERMINATIONS

It is recommended that sidewall vent terminations of over 24 inches (0.6 M) in length or rooftop vent terminations of over 36 inches (1 M) in length be supported by EITHER the factory accessory vent termination kit or field-supplied brackets or supports attached to the structure. A factory accessory vent termination kit may be used for direct vent terminations. Termination kits are available for 2-in. or 3-in. pipe. See Table 12 for available options.

Direct Vent / 2−Pipe System

In a direct−vent (2−pipe) system, all air for combustion is taken directly from outdoor atmosphere, and all flue products are discharged to outdoor atmosphere. Combustion-air and vent pipes must terminate together in the same atmospheric pressure zone, either through the roof (preferred) or a sidewall. See Figure 65 for references to clearances required by National code authorities.

NOTICE

space or garage. Combustion air requirements for this option are the same as the requirements for providing outside air for combustion for a single pipe vent system. Refer to the “Air For Combustion and Ventilation Section.”

Provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:

Non-Direct Vent (1-pipe) System

In a non direct-vent (1-pipe) system, all air for combustion is taken from the area adjacent to furnace, and all flue products are discharged to outdoor atmosphere. Air for combustion must be supplied as described in the Air For Combustion and Ventilation Section. Do not use an abandoned chimney to supply outside air to the furnace. See Figure 66 for references to clearances required by National code authorities.

A combustion air pipe to the outdoors is not required for a single pipe vent system. A 12-in. (304 mm) long pipe with a 2−in. (50 mm Nominal Dimension− ND) tight radius 90 degree elbow is required to be attached to the combustion air pipe adapter on the furnace. (See Figure 62) This short inlet air pipe helps to ensure stable combustion, as well as allow for sound attenuation. To aid sound attenuation, point the inlet air pipe away from occupants. An extra elbow and/or five feet (1.5 M) of pipe may be used to accomplish the sound attenuation function.

NOTICE

OPTIONAL VENTING BELOW THE FURNACE

The venting system may be positioned below the furnace ONLY IF the factory accessory External Vent Trap Kit is used. The External Vent Trap Kit is only approved for PVC/ABS DWV venting systems.

CAREFULLY FOLLOW THE INSTRUCTIONS PROVIDED WITH THE EXTERNAL VENT TRAP KIT FOR LAYING OUT THE VENTING SYSTEM AND THE DRAIN SYSTEM. The

instructions included with this furnace DO NOT APPLY to vent systems that are located below the furnace

OPTIONAL CONFIGURATION FOR COMBUSTION AIR INLET PIPE

When sizing venting systems, the equivalent length of the optional inlet pipe moisture trap must be taken into account.

Ventilated Combustion Air Systems

In a ventilated combustion air option, the vent terminates and discharges the flue products directly to the outdoors similar to a direct vent system. See Figure 66 for references to clearances required by National code authorities.

All air for combustion is piped directly to the furnace from a space that is well ventilated with outdoor air (such as an attic or crawl space) and the space is well isolated from the living

CARBON MONOXIDE POISONING HAZARD

Failure to follow the instructions outlined in Locating the Vent Termination for each appliance being placed into operation could result in carbon monoxide poisoning or death.

The instructions included with this furnace DO NOT APPLY to vent systems that are located below the furnace. CARE-

FULLY FOLLOW THE INSTRUCTIONS PROVIDED WITH THE EXTERNAL VENT TRAP KIT FOR LAYING OUT THE VENTING SYSTEM AND THE DRAIN SYSTEM when all or part of the venting system is placed below the furnace.

Proper configuration of the venting and drain system is critical when placing all or part of the venting system below the level of the furnace. VENT GASSES COULD BE RELEASED FROM THE DRAINAGE SYSTEM, if the instructions provided with the External Vent Trap Kit are not followed.

WARNING

440 01 4005 05 41

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

MATERIALS

Table 13 Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installation)

1. All pipe, fittings, primers*, and solvents* must conform to American National Standards Institute (ANSI) standards and American Society for Testing and Materials (ASTM) standards or ULC S636 where required by code.

USA

CANADA

Material Description

PVC

ABS

CPVC

*PVC and ABS pipe may use either DWV or pressure rated fittings. **Colored or tinted solvents or primers must be used where required by code in the USA †ABS plastic does not require a primer before solvent cementing. A cleaner for ABS is recommended to remove any surface residue. ABS cleaners are not subject to ASTM standards.

Polypropylene Approved Manufacturer Solvents Primers Cements Poly Pro® M & G Dura Vent Not Permitted Not Permitted NOTE: Polypropylene vent systems are UL*1738 and ULC S636 listed and assembled using mechanical fastening systems sup-

plied by the vent manufacturer.

2. See Table below for approved materials for use in the U.S.A.

3. ULC S636 vent systems must be composed of pipe, fittings, cements, and primers from the same supplier.

4. Factory accessory concentric vent kits are ULC S636 listed.

1. Installation in Canada must conform to the requirements of CAN/CSA B149 code.

2. Vent systems must be composed of pipe, fittings, cements, and primers from the same supplier and listed to ULC S636.

3. Not all materials below may be approved or listed to ULC S636.

4. Royal Pipe and IPEX are approved suppliers of ULC S636 pipe, fittings, cements and primers*.

5. Factory accessory concentric vent kits are ULC S636 listed for use with Royal Pipe and IPEX venting systems Type ASTM or ULC Specification

Pipe

Pressure Pipe Schedule 40 D1785

DWV Schedule 40 D1785/D2665

Cellular Core Schedule 40 F891

SDR 26 N/A D2241 SDR 21 N/A D2241

IPEX Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636

Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636

ABS Schedule 40 D1527 D2468

DWV−IPS Sizes Schedule 40 D2661 D2661

Cellular Core DWV−IPS

Sizes

Pressure Pipe Schedule 40 F441 F438 F656 F493

SDR N/A F442 N/A

IPEX Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636

Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636

Schedule 40 F628

D2466

D2665

Solvents/ Primers**

F656 D2564

Clear Cleaner For

ABS†

Cements

D2235

Figure 45

Attach gaskets to vent pipe and combustion air adapters

Vent Coupling and Adapter with Gaskets

Vent Coupling and Adapter

A13074

Figure 46 Vent Pipe Flush with Adaptor

VENT PIPE ADAPTER WITH GASKET INSTALLED ON FURNACE. VENT PIPE IS CUT FLUSH WITH TOP OF ADAPTER. PRIME AND CEMENT VENT PIPE TO ADAPTER. ALLOW TO DRY BEFORE INSTALLING VENT COUPLING.

A13076A

42 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 47 Vent Pipe Flush Showing Coupling

ALIGN NOTCHES IN VENT PIPE COUPLING OVER STAND− OFF ON ADAPTER. TORQUE LOWER CL AMP 15 LB−IN. WHEN REMAINING VENT PIPE IS INSTALLED, TORQUE UPPER CL AMP TO 15 LB−IN.

A13076B

Locating the Vent Termination

General

NOTE: Termination Requirements for the Provinces of Alberta and Saskatchewan are located at the end of this section.

Combustion−air inlet pipe (Direct Vent/2−Pipe system only) and vent pipe must terminate outside structure, either through sidewall or roof.

For vent termination clearance, references to National codes are shown in Figure 65 for Direct Vent/2−Pipe system and Figure 66 for Ventilated Combustion Air/Non−direct Vent/1−Pipe system. For exterior termination arrangements, refer to Figure 65 for Direct Vent/2−Pipe system and Figure 66 for Ventilated Combustion Air/Non− Direct/1−Pipe system. Contact Local code authorities for other requirements to and/or exemptions from the National codes shown in the figures.

Roof termination is the recommended termination location. Roof terminations provide better performance against sustained prevailing winds. The roof location is preferred since the vent and combustion air system is less susceptible to damage or contamination. The termination is usually located away from adjacent structures or other obstacles such as inside corners, windows, doors or other appliances. It is less prone to icing conditions, and it often has less visible vent vapors.

Sidewall terminations may require sealing or shielding of building surfaces with a corrosive resistance material due to the corrosive properties of combustion products from the vent system, as well as protection of adjacent structures.

NOTICE

RECOMMENDED SUPPORT FOR VENT TERMINATIONS

It is recommended that side-wall vent terminations in excess of 24 inches (0.6 M) or rooftop terminations in excess of 36 inches (1.0 M) in vertical length be supported by EITHER the Direct Vent Termination Kit shown in Table 12 or by field-sup- plied brackets or supports fastened to the structure.

NOTE: (Direct Vent/2−Pipe system ONLY) Terminate with the standard termination as shown in Figure 65 or use a factory−approved accessory termination kit.

When determining appropriate location for termination, consider the following guidelines:

1. Comply with all clearance requirements stated in

Figure 65 or Figure 66 per application.

2. Termination or termination kit should be positioned where vent vapors will not damage plants/shrubs, air conditioning equipment or utility meters.

3. Do not locate termination directly into prevailing winds. Termination should be positioned so that it will not be affected by sustained prevailing winds over 30 mph, wind eddy, such as inside building corners, or by recirculation of flue gases, airborne leaves, or light snow.

4. Termination or termination kit should be positioned where it will not be damaged by or subjected to foreign objects such as stones, balls, etc.

5. Termination or termination kit should be positioned where vent vapors are not objectionable.

Inside Corner Terminations

Inside corner vent terminations are permitted provided that:

1. Only two exterior walls come together to form an angle of 90 degrees to 135 degrees. There are no other exterior walls attached to either wall to form an alcove.

2. The clearance distances apply when the vent is at least 3 feet (1 meter) from, but not more than 6 feet (2 meters) away from an inside corner.

3. For vent terminations located more than 6 feet (2 meters) from an inside corner, refer to the appropriate Direct Vent Clearance Table for all two pipe terminations or Non−Direct Vent Clearance Table for all single pipe terminations.

4. The clearance distances to items between the vent termination and the outside corner, refer to the appropriate Direct Vent Clearance Table for all two pipe terminations or Non−Direct Vent Clearance Table for all single pipe terminations.

440 01 4005 05 43

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 48 Inside Corner Termination

Clearance distances for items greater than 3 feet (1 meter ) away from the inside corner, refer to the Inside Corner Clearance Table.

Notes:

For this illustration, Wall A is the wall adjacent to the wall the vent termination is located. Wall B is the wall the vent termination is located.

The termination can be located on either wall.

Minimum distance of a vent terminal to an inside corner is 3 ft. (1 M).

Maximum distance from an inside corner is 6 ft. (2 M).

If the vent termination is located more than 6 ft. (2 M) away from an inside corner, refer to the appropriate Direct or Non−Direct Vent Clearance Tables.

For clearance distances when vent termination is located more than 6 ft. (2 M) away from an inside corner, refer to the appropriate Direct Vent or Non−Direct Vent Clearance Table. Clearance description when termination is at least 3 ft. (1 M) away and not more than 6 ft. (2 M) away from an inside corner.

Clearance above grade, veranda, porch, deck, balcony or anticipated snow level 12−in. (305 mm) Clearance to a permanently closed window on either Wall A or Wall B 12−in. (305 mm) Vertical clearance to a soffitt located above the vent termination within a horizontal distance of 2 ft. (61 cm) from the centerline of the vent termination Clearance to a ventilation exhaust (including HRV/ERV) on either Wall A or Wall B 12−in. (305 mm) Clearance above paved sidewalk or paved driveway located on public property 7 ft. (2.1 M) Clearance under a veranda, porch, deck, or balcony N.P.*

No operable windows, doors or intakes of any type within the shaded areas of Wall A and B.

For all other items, refer to the Inside Corner Clearance Table.

3 ft. (1 M)

3 ft. (1 M) to 6 ft. (2 M)

Vent Termination

A170005

6 ft. (2 M)

No operable windows, doors or intakes of any type are permitted on Wall B between the vent termination and the inside corner when the vent termination is at least 3 ft. (1 M) away and not more than 6 ft. (2 M) away from an inside corner. The following items on Wall A must be located at least 3 ft. (1 M) away from the inside corner when a vent termination is located on Wall B and the vent termination is at least 3 ft. (1 M) away or not more than 6 ft. (2 M) away from an inside corner.

A window or door that may be opened The centerline extended above electrical meter or gas service regulator assembly A service regulator vent outlet The centerline of a dryer or water heater vent, or other appliance’s vent intake A non−mechanical air supply inlet

Clearance distances shown for Wall A are measured horizontally from the exit of the termination on Wall B to the closest edge of the item shown below.

Clearance to a mechanical air supply (including HRV/ERV) inlet unless termination is 3 ft. (1 M) above the horizontal line of the intake

For clearance distances from a vent termination to the outside corner of the wall, refer to the appropriate Direct Vent or Non−Direct Vent Clearance Table

*N.P. = Not Permitted *N/A = Not Applicable

44 440 01 4005 05

Specifications subject to change without notice.

10 ft. (3 M)

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Direct Vent / 2−Pipe System

Direct vent (2−pipe) vent and combustion air pipes must terminate outside the structure. See Figure 65 for references to vent clearances required by National code authorities. Allowable vent and combustion air terminations are shown in

Figure 52.

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the instructions outlined in Locating the Vent Termination for each appliance being placed into operation could result in carbon monoxide poisoning or death.

For all venting configurations for this appliance and other gas appliances placed into operation for the structure, provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:

U.S.A. Installations: Current edition of Section 9.3 NFPA 54/ANSI Z223.1, Air for Combustion and Ventilation and applicable provisions of the local building codes.

Canadian Installations: Current edition of Part 8 of CAN/CSA−B149.1. Venting Systems and Air Supply for Appliances and all authorities having jurisdiction.

Ventilated Combustion Air

The vent pipe for a Ventilated Combustion Air System must terminate outdoors. See Figure 65 for references to vent clearances required by National code authorities. Allowable vent terminations are shown in Figure 53. The combustion air pipe terminates in a well−ventilated attic or crawl space. Follow the clearances as shown in Figure 63 and Figure 64. The combustion air pipe cannot terminate in attics or crawl spaces that use ventilation fans designed to operate in the heating season. If ventilation fans are present in these areas, the combustion air pipe must terminate outdoors as a Direct Vent System.

Non−Direct Vent / 1−Pipe System

The vent pipe for a Non Direct Vent (1−pipe) system must terminate outdoors. See Figure 66 for references to vent clearances required by National code authorities. Allowable vent terminations are shown in Figure 53. A combustion air inlet pipe to the outdoors is not required for a Non−Direct Vent System. A 12−in. long section of pipe with a tight radius 2−in. (51 mm) 90 degree elbow is required to be attached to the furnace. See Figure 49 and Figure 51. This short inlet air pipe helps to ensure inlet air pipe away from occupants. An extra elbow and/or 5 ft. (1.5 M) of pipe may be used to accomplish the sound attenuation function.

Termination Requirements for the Provinces of Alberta and Saskatchewan

The Provinces of Alberta and Saskatchewan require a minimum unobstructed distance of 4 ft. (1.2 M) from the foundation to the property line of the adjacent lot for vent termination of any appliance with an input over 35,000 btuh. If there is less than 4 ft. (1.2 M) of unobstructed distance to the property line of the adjacent lot, no type of vent termination is permitted for appliances with inputs greater than 35,000 btuh. There are no additional restrictions on unobstructed distances greater than 8 ft. (2.4 M). All single, two-pipe and concentric vents may be used, providing all other Code and manufacturer’s requirements in these instructions are adhered to. Refer to the appropriate Vent Termination section above for locating the vent termination . If the unobstructed distance from the foundation to the property line of the adjacent lot is no less than 4 ft. (1.2 M) and no greater than 8 ft. (2.4 M), it will be necessary to re-direct the

flue gas plume. In this situation, a concentric vent kit cannot be used. A 2-pipe termination (or single pipe termination when permitted) that re-directs the flue gas away by use of an elbow

or tee, certified to ULC S636 must be used. (See Figure 49 and Figure 51) The concentric vent kit currently cannot be modified to attach

an elbow to the vent portion of the rain cap. A tee attached to the rain cap could potentially direct the flue gas plume toward the intake air stream and contaminate the incoming combustion air for the furnace. Refer to Figure 49 and Figure 51 for terminations approved for use in Alberta and Saskatchewan.

from the adjacent property line

Figure 49 Tee at Termination Outlet

OPTIONAL TERMINATION BRACKET FOR 2-PIPE TERMINATIONS

12 IN. (305 MM) MIN. SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT.

12-IN. (305 MM)

ABOVE ANTICIPATED

SNOW LEVEL

A13078A

440 01 4005 05 45

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 50

EXAMPLE FOR UPFLOW INSTALLATIONS. MAY BE APPLIED TO OTHER CONFIGURATIONS.

Sample Inlet Air Pipe Connection for Polypropylene Venting Systems

A12220

Figure 51 Vent Terminations

OPTIONAL BRACKET COUPLING

(ELBOW PARALLEL TO WALL)

COMBUSTION-AIR

12 IN. (305 MM) MIN. SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT.

MAINTAIN 12 IN. (305 MM) CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER.

A13078B

EXHAUST

OVERHANG

CLEARANCE TO OVERHANG PER CODE

12 IN.

(305 MM) MIN. GROUND

LEVEL OR ANTICIPATED SNOW LEVEL

A13078C

46 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 52 Combustion Air and Vent Pipe Termination for Direct Vent (2−Pipe) System

Vertical separation between combustion air and vent

8 ¾ in. (222mm) for 3 in.(76mm)

6 ¾ in. (172mm) for 2in. (51mm)

Maintain 12 in. (305mm) min. Clearance above highest anticipated snow level maximum of 24 in. (614mm) above roof

18 in. Maximum

(457mm)

At least 36 in.

(914mm)

At least 36 in. (914mm)

Roof Termination (Preferred)

Note:

“A” denotes 0 To 2 in. (51mm)

Between the first 2 vents Third vent (and fourth vent, if used) must be 36 in. Away (914mm)

Abandoned masonry used as raceway (per code)

Concentric Vent and Combustion Air Side Termination

12 in. Min from overhang or roof (Typ.)

12 in. (305mm) separation between bottom of com− bustion air and bottom of vent (Typ.)

Maintain 12 in. (305mm) min. Clearance above highest an− ticipated snow level or grade whichever is greater (Typ.)

At least 36 in.

(914mm)

Concentric Vent and Combustion Air

Roof Termination (preferred)

At least 36 in. (914mm)

Note:

“A” denotes 0 To 2 in. (51mm) Between the first 2 vents Third vent (and fourth vent, if used) must be 36 in . Away (914mm)

Note:

36−in. separation between pairs of inlets only required for direct−vent systems

Maintain 12 in. (305mm) min. Clearance above highest anticipated snow level maximum of 24 in. (614mm) above roof

1 in. (25mm) maximum (Typ.) from wall to inlet

12 in. From Overhang or roof (Typ.)

Maintain 12 in. (305mm) min. Clear− At least 36 in. (914mm)

Side wall termination of less than 12 in. (305mm) above highest snow level

ance above highest anticipated snow

level or grade whichever is greater

(Typ.)

L12F044

Figure 53 Vent Pipe Termination for Non−Direct Vent and Ventilated Combustion Air System

Roof Termination (Preferred)

Ven t

(305mm)

Maintain 12 in .

minimum clearance

above highest anticipated

snow level maximum of

24 in. (610mm) above roof.

Abandoned masonry used as raceway (per code)

12 in. min. (305 mm)from

overhang or roof

Sidewall Termination

with Straight Pipe (preferred)

Maintain 12 in. (305mm) minimum clearance above highest anticipated snow level or grade whichever is greater

90°

Side wall termination with 2 elbows (preferred)

12 in. (305 mm) min. from

overhang or roof

Maintain 12 in. (305mm) minimum clearance above highest anticipated snow level or grade whichever is greater.

6 in. (152mm) minimum clearance

between wall and end of vent pipe.

10 in. (254mm) maximum pipe length

A05091

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Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Size the Vent and Combustion Air Pipes General

Vent and

Combustion Air

Pipe Diameters

1−1/2−in. (38 mm) No Ye s No No No 2−in. (51 mm)

2−in. (51 mm) No Yes No No No 2−in. (51 mm)

2−1/2−in. (64 mm) No No No Yes No

3−in. (76−mm) No No No Yes No 3−in. (76 mm)

4−in. (102 mm) No No No Yes Yes 3−in. (76 mm)

Furnace combustion air and vent pipe connections are sized for 2-in. (50 mm ND) PVC/ABS DWV pipe. The combustion air and vent pipe connections also accommodate 60mm polypropylene venting systems with outside diameters of approximately 60 mm (2−3/8 inches). Any pipe diameter change should be made outside furnace casing in vertical pipe. Any change in diameter to the pipe must be made as close to the furnace as reasonably possible (see Figure 54).

The Maximum Vent Length for the vent pipe and combustion air pipe (when used) equals the Maximum Equivalent Vent Length (MEVL) in Table 14, minus the number of fittings multiplied by the deduction for each type of fitting used from Table 15.

1−1/2−in.

(38 mm)

Combustion−Air and Vent Pipe

Figure 54

Diameter Transition Location and Elbow Configuration

FURNACE

NOT IN HORIZONTAL SECTION

PIPE DIAMENTER TRANSITION IN SECTION

Approved Two−Pipe Termination Fittings

2−in.

(51 mm)

2−1/2−in.

(64 mm)

3−in.

(76−mm)

Combustion Air Inlet Moisture Trap

To prevent moisture from trickling into the furnace vestibule, a trap can be installed in the intake air pipe near the furnace. Connecting a drain line to the trap is recommended as trace amounts of moisture will evaporate into the intake air stream. If the combustion air inlet is located near a moisture exhaust duct, or there are other concerns of excessive moisture being drawn into the combustion air inlet, it is encouraged to connect a drain line to the trap.

The trap can be constructed from a running tee of the same diameter of the intake air pipe with EITHER a removable cap attached to a 6-inch long pipe connected to the tee or the External vent Trap Kit to help prevent contaminants from entering the furnace. See Figure 55.

The External Vent Trap Kit accessory may be used as a trap for the combustion air inlet pipe if a large amount of moisture must be removed. The drain line may be connected to the same drain as the furnace condensate and the evaporator coil condensate line ONLY if the inlet air trap drain and the evaporator coil drain empty into an open segment of pipe above the drain, See Figure 13. When using the External Vent Trap Kit, refer to those instructions for proper drain connections.

The tee may also be connected to the intake air pipe on the side of the casing. See Figure 55.

In any configuration, it will be necessary to add the equivalent length of the tee (15 feet/5 M) to the Total Equivalent Vent

A93034

Length of the venting system.

4−in.

(102 mm)

Allowable

Concentric Vent

2−in. (51 mm) 3−in. (76 mm)

Kit

NOTICE

OPTIONAL CONFIGURATION FOR COMBUSTION AIR INLET PIPE

In applications where there is a risk of excessive moisture entering the combustion air inlet pipe, a moisture trap may be added to the inlet pipe to help prevent moisture from entering the furnace from the combustion air inlet pipe. See Figure 55. When sizing venting systems, the equivalent length of the optional moisture trap (15 feet/5 M) must be taken into account

48 440 01 4005 05

Specifications subject to change without notice.

ADDITIONAL INFORMATION FOR POLYPROPYLENE VENTING SYSTEMS

Polypropylene venting systems include flexible vent pipe. These flexible vent pipes have a different equivalent vent length than straight sections of PVC/ABS DWV vent pipe. Be sure to make the appropriate deductions from the Maximum Equivalent Vent Length (MEVL), or additions to the Total Equivalent Vent Length (TEVL), when applying flexible vent pipes in polypropylene venting systems. See the polypropylene vent system manufacturer’s installation instructions for details. When using metric-sized venting systems, use these equivalencies for obtaining the proper MEVL from the Tables:

Use 2” Vent Tables for 60mm (o.d.) vent systems Use 3” Vent Tables for 80mm (o.d.) vent systems Use 4” Vent Tables for 100mm (o.d.) vent systems

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

The measured length of pipe used in a single or 2−pipe termination is included in the total vent length. Include deductions from the Maximum Equivalent Vent Length (MEVL) contained in the Venting Tables for elbows and flexible vent pipe. Factory accessory concentric vent terminations, or pipe lengths and elbows used for “standard” vent terminations (see vent termination figures associated with Table 14) do not require a deduction from the Maximum Equivalent Vent Length. Include a deduction for a Tee when used for Alberta and Saskatchewan terminations.

NOTE: Polypropylene venting systems MAY require additional deductions from the MEVL, or additions to the TEVL, for vent terminations and flexible pipe sections. See the polypropylene venting system manufacturer’s instructions for details on equivalent lengths of vent terminations and flexible vent pipes, and for calculating total vent lengths.

To calculate the Total Equivalent Vent Length (TEVL) of the venting system:

1. Measure the individual distance from the furnace to the termination for each pipe.

2. Count the number of elbows for each pipe.

3. For each pipe, multiply the number of elbows by the equivalent length for the type of elbow used. Record the equivalent length of all the elbows for each pipe.

4. If a Tee is used on the termination (Alberta and Saskatchewan, when required), record the equivalent length of the Tee used.

5. Calculate Total Equivalent Vent Length by adding the equivalent lengths of the fittings to the lengths of the individual vent and combustion air pipes.

6. When using polypropylene venting systems with flexible vent pipes, perform adjustments for the equivalent length of the flexible vent pipe to the calculated total equivalent

venting system length. See the polypropylene vent system manufacturer’s instructions for details.

7. Select a diameter of vent pipe from Table 14 and note

the Maximum Equivalent Vent Length (MEVL) shown for that application for that specific furnace input size. Compare the Total Equivalent Vent Length (TEVL) to the MEVL:

a. If the Total Equivalent Vent Length is shorter than the

Maximum Equivalent Vent Length for the diameter of pipe chosen, then that diameter of pipe selected may be used.

b. If the Total Vent Length is longer than the Maximum

Equivalent Vent Length for the diameter of pipe chosen, that diameter pipe MAY NOT be used for venting the furnace. Try the next larger diameter pipe.

NOTE: If the calculated Total Equivalent Vent Lengths results in different diameter pipes for the vent and combustion air, select the larger diameter for both pipes.

NOTE: If the Maximum Vent Length for diameter of the pipe selected is longer than the measured length and the equivalent length of all the fittings and terminations (TEVL), recalculate Total Equivalent Vent Length using the next smaller diameter. If the Maximum Vent Length is still longer than the longer TEVL of the vent pipe or combustion air pipe, then that diameter of pipe selected may be used.

When installing vent systems with pipe lengths of 10 ft. (3.0 M) or less, use the smallest allowable pipe diameter. Using pipe size greater than required for short venting systems may result in loss of efficiency, incomplete combustion, flame disturbance, or flame sense lockout.

For vent systems longer than 10 ft. (3.0 M), any larger diameter shown in Table 14 for that size model may be used.

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Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 55 Recommended Combustion Air Inlet Moisture Trap

Tee

Dry Well

Cap

(water tight

and removable)

TO CODE−APPROVED DRAIN OR CONDENSATE PUMP

Recommend “T” fitting with 4−inch minimum height standpipe (A) of same diameter or larger extending upward.

Tee

Dry Well

Tee

Cap

(water tight

Dry Well

and removable)

Representative drawing only, some models may vary in appearance.

Cap

(water tight

and removable)

A170134

Combustion Air and Vent Piping Insulation Guidelines

NOTE: Use closed cell, neoprene insulation or equivalent.

The vent pipe may pass through unconditioned areas. The amount of exposed pipe allowed is shown in Table 16.

1. Using winter design temperature (used in load calculations), find appropriate temperature for your application and furnace model.

2. Determine the amount of total and exposed vent pipe.

3. Determine required insulation thickness for exposed pipe length(s).

50 440 01 4005 05

Specifications subject to change without notice.

4. 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.

5. Insulate combustion air inlet piping when run in warm, humid spaces.

6. Install the insulation per the insulation manufacturer’s installation instructions.

NOTE: Pipe length (ft / M) specified for maximum pipe lengths located in unconditioned spaces (See Table 16) cannot exceed total allowable pipe length as calculated from Table 14.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Configure the Furnace

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death. To route the vent pipe and combustion air pipe through the furnace, the manufacturer supplied kit must be used. Failure to properly seal the blower compartment from the furnace vestibule could result in the circulation of carbon monoxide throughout the structure. The vent pipe and combustion air pipe must be a continuous pipe while passing through the blower compartment. Seals supplied in this kit must be installed per the instructions provided. Follow all procedures outlined in these instructions.

WARNING

Near Furnace Vent Connections

Offsets in the vertical portion of the vent pipe should be made with 45 degree elbows instead of 90 degree elbows. Short horizontal runs of vent pipe are difficult to pitch correctly and may trap water in the vent pipe. Trapped water in the vent pipe may result in nuisance pressure switch tripping.

Figure 56 Near Furnace Vent Connections

Install the Vent and Combustion Air Pipes

With the furnace installed in the required position, remove the desired knockouts from the casing. It will be necessary to remove one knockout for the vent pipe and the other knockout for the combustion air connection. (See Figure 12) Use a flat blade screwdriver and tap on the knockout on opposite sides, where the knockout meets the casing. Fold the knockout down with duct pliers and work the knockout back and forth until it is removed. Trim any excess metal from the knockout with tin snips. The vent elbow can be rotated to the required location on the casing if necessary. See Figure 57 to rotate the vent elbow:

1. Loosen the clamp on the inlet of the vent elbow attached to the inducer.

2. Rotate the vent elbow to the required position. There are rounded notches in the vent elbow to align it with the inducer for each orientation.

3. Tighten the clamp around the vent elbow. Torque the clamp to 15 lb-in. See Figure 58 through Figure 61.

Figure 57 Inducer Vent Elbow − PSC

Avoid short horizontal offsets with 90 deg. Elbows. Short offsets can be difficult to slope and may trap condensate.

Use 45 deg. Elbows where possible, to ensure condensate drainage.

Slope vent pipe back to the furnace at least ¼” per foot

L14F020A

PSC INDUCER ASSEMBLY

TABS ON THE INDUCER OUTLET RESTRICTOR SNAP

INTO THE SLOTS AT THE OUTL ET OF THE INDUCER

SEE MAXIMUM EQUIVALENT VENT LENGTH TABLE

FOR USAGE:

A13075A

A170006B

L14F020B

440 01 4005 05 51

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 58 Upflow Configurations

UPFLOW LEFT − VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

Figure 59 Downflow Configurations

A11309

DOWNFLOW LEFT − VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

A11311

UPFLOW RIGHT − VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

UPFLOW VERTICAL − VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

* See NOTES following figures.

A11308

A11310

DOWNFLOW RIGHT − VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

DOWNFLOW VERTICAL − VENT CONFIGURATION

Requires Accessory Internal Vent Kit

See Specification Sheets for current kit number

Representative drawing only, some models may vary in appearance.

* See NOTES following figures.

A11312

L11F063

52 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 60 Horizontal Left Configurations

HORIZONTAL LEFT − VERTICAL VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

Figure 61 Horizontal Right Configurations

HORIZONTAL RIGHT − VERTICAL VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

HORIZONTAL LEFT − LEFT VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

HORIZONTAL LEFT − RIGHT VENT CONFIGURATION*

* Requires accessory Internal Vent Kit

Representative drawing only, some models may vary in appearance.

* See NOTES following figures.

HORIZONTAL RIGHT − LEFT VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

HORIZONTAL RIGHT − RIGHT VENT CONFIGURATION

Representative drawing only, some models may vary in appearance.

* See NOTES following figures.

440 01 4005 05 53

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

NOTES:

1. Attach vent pipe adapter with gasket to furnace casing.

2. Align notches in rubber coupling over standoffs on adapter. Slide clamps over the coupling.

3. Slide vent pipe through adapter and coupling into vent elbow.

4. Insert vent pipe into vent elbow.

5. Torque all clamps 15−lb.−in.

6. Attach combustion air pipe adapter with gasket to furnace.

7. Attach combustion air pipe to adapter with silicone. Pilot drill a 1/8−in. Hole in adapter and secure with a #7 x 1/2−in. Sheet metal screw.

Installing the Vent Pipe Adapter and Combustion Air Pipe Adapter

CARBON MONOXIDE POISONING HAZARD

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

To route the vent pipe and combustion air pipe through the furnace, the manufacturer supplied kit must be used. Failure to properly seal the blower compartment from the furnace vestibule could result in the circulation of carbon monoxide throughout the structure. The vent pipe and combustion air pipe must be a continuous pipe while passing through the blower compartment. Seals supplied in this kit must be installed per the instructions provided. Follow all procedures outlined in these instructions.

CARBON MONOXIDE POISONING HAZARD

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

DO NOT use cement to join polypropylene venting systems. Follow the polypropylene venting system manufacturer’s instructions for installing polypropylene venting systems.

NOTE: The rubber coupling that attaches to the vent pipe adapter must be used. The adapter seals the vent pipe to the casing and reduces the strain on the vent elbow attached to the inducer.

1. Apply the gaskets to the vent pipe and combustion air pipe adapters. If supplied, remove and discard round center “slug” from interior of gasket.

NOTE: The vent pipe adapter can be distinguished from the inlet pipe adapter by the absence of an internal pipe-stopping ring. The vent pipe can pass through the vent pipe adapter; it cannot pass through the inlet pipe adapter.

2. Align the screw holes in the plastic vent pipe adapter with the dimples in the casing.

3. Pilot drill the screw holes for the adapter in the casing and attach the vent pipe adapter to the furnace with sheet metal screws

WARNING

See Figure 45.

4. Slide the end of the rubber vent coupling with notches in it over the standoffs on the vent pipe adapter.

5. Insert a length of vent pipe through the coupling into the outlet of the vent elbow.

6. Tighten the clamp around the outlet of the vent elbow. Torque the clamp to 15 lb−in.

NOTICE

The following instructions are for PVC/ABS DWV vent piping, only. DO NOT USE THESE TECHNIQUES FOR POLYPROPYLENE VENT PIPING SYSTEMS. See the polypropylene vent system manufacturer’s instructions for installing polypropylene venting systems.

Install the remaining vent and combustion air pipes as shown below. It is recommended that all pipes be cut, prepared, and preassembled before permanently cementing any joint.

1. Working from furnace to outside, cut pipe to required length(s).

2. De−burr inside and outside of pipe.

3. Chamfer outside edge of pipe for better distribution of primer and cement.

4. Clean and dry all surfaces to be joined.

5. Check dry fit of pipe and mark insertion depth on pipe.

6. Insert the vent pipe into the vent elbow.

7. Torque clamp on vent elbow 15 lb−in.

8. Torque clamp on vent coupling 15 lb−in.

9. Insert the combustion air pipe into the adapter.

10. Pilot drill a screw hole through the adapter into the combustion air pipe and secure the pipe to the adapter with sheet metal screws. DO NOT DRILL INTO POLYPROPYLENE VENT PIPES. Use an optional accessory vent coupling, if needed.

11. Seal around the combustion air pipe with silicone or foil tape. SILICONE SEALERS MAY NOT BE APPROPRIATE FOR POLYPROPYLENE VENT SYSTEMS. SEE POLYPROPYLENE VENT SYSTEM MANUFACTRUER’S INSTRUCTIONS.

12. After pipes have been cut and preassembled, apply generous layer of cement primer to pipe fitting socket and end of pipe to insertion mark. Quickly apply approved cement to end of pipe and fitting socket (over primer). Apply cement in a light, uniform coat on inside of socket to prevent buildup of excess cement. Apply second coat. DO NOT CEMENT POLYPROPYLENE FITTINGS.

13. While cement is still wet, twist pipe into socket with 1/4−in. turn. Be sure pipe is fully inserted into fitting socket.

14. Wipe excess cement from joint. A continuous bead of cement will be visible around perimeter of a properly made joint.

15. Handle pipe joints carefully until cement sets.

16. Horizontal portions of the venting system shall be supported to prevent sagging. Space combustion air piping and vent piping hangers as shown in the table below. Support pipes using perforated metal hanging strap or commercially available hangers or straps designed to support plastic pipe.

54 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Hanger Spacing

Diameter

1 1/2−in. 3−ft. 2 1/2−ft. 3−ft. 3−ft. 3.25−ft.

38−mm 914−mm 762−mm 914−mm 914−mm 1000 mm

2−in. 3−ft. 3−ft. 3−ft. 3−ft. 3.25−ft.

51−mm 914−mm 914−mm 914−mm 914−mm 1000 mm

2 1/2−in. 3 1/2−ft. 3−ft. 3 1/2−ft. 3 1/2−ft. 3.25−ft.

64−mm 1067−mm 914−mm 1067−mm 1067−mm 1000 mm

3−in. 3 1/2−ft. 3−ft. 3 1/2−ft. 3 1/2−ft. 3.25−ft.

76−mm 1067−mm 914−mm 1067−mm 1067−mm 1000 mm

4−in. 4−ft. 3 1/2−ft. 4−ft. 4−ft. 3.25−ft.

102−mm 1219−mm 1067−mm 1219−mm 1219−mm 1000 mm

PVC Sch 40 SDR 21 & 26 ABS CPVC Polypropylene

! CAUTION

FURNACE RELIABILITY HAZARD

Failure to follow this caution may result in nuisance short cycling, frozen vent termination, and/or no heat.

Slope the vent and combustion air piping downward towards furnace at a minimum of 1/4−in. per linear ft. of pipe.

17. Slope the vent and combustion air piping and downward towards furnace. A minimum slope of at least 1/4 in. per linear ft.(1 in. per 4 ft.) with no sags between hangers is required. See Caution Box below.

18. Complete the vent and combustion air pipe installation by connecting to the concentric vent or by installing the required termination elbows as shown in Figure 52 and Figure 53, Alberta Figure 49 and Figure 51. For ventilated combustion air terminations, refer to Figure 63 and Figure 64.

19. Use appropriate methods to seal openings where combustion air pipe and vent pipe pass through roof or sidewall.

CARBON MONOXIDE POISONING HAZARD

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

DO NOT use cement to join polypropylene venting systems. Follow the polypropylene venting system manufacturer’s instructions for installing polypropylene venting systems.

WARNING

Material

4. Clean and prime the end of the pipe that is flush with the vent adapter with a primer that is appropriate for the type of pipe being used.

5. Re−insert the pipe through the casing into the vent elbow.

6. Tighten the clamp around the outlet of the vent elbow. Torque the clamp to 15 lb−in.

7. Apply cement to the end of the pipe and to the inside of the plastic vent adapter.

8. Slide the adapter over the vent pipe and align the screw holes in the adapter with the dimples in the furnace casing.

9. Pilot drill 1/8−in. screw holes for the adapter in the casing and secure the adapter to the furnace with sheet metal screws.

10. Loosen the clamps on the rubber vent coupling.

11. Slide the end of the coupling with notches in it over the standoffs in the vent pipe adapter.

12. Tighten the clamp of the coupling over the vent pipe adapter. Torque the lower clamp around the vent pipe adapter to 15 lb−in.

13. Pilot drill a 1/8−in. hole in the combustion air pipe adapter.

14. Complete the vent and combustion air pipe as shown in “Install the Vent and Combustion Air Pipe”

NOTICE

FOR POLYPROPYLENE VENTING SYSTEMS

When using polypropylene venting systems, all venting materials used, including the vent terminations, must be from the same manufacturer.

Optional Installation of the Vent Pipe

NOTE: DO NOT USE THIS TECHNIQUE FOR

POLYPROPYLENE VENTING SYSTEMS. This option provides a disconnect point for the vent pipe. The

vent pipe must be cemented to the plastic vent pipe adapter to maintain a sealed vestibule. See Figure 46 and Figure 47

1. Insert a length of vent pipe through the casing into the outlet of the vent elbow.

2. Slide the plastic vent pipe adapter over the length of the vent pipe down to the furnace casing. Mark the pipe where it is flush with the outlet of the adapter.

3. Remove the pipe from the furnace and the adapter and cut off any excess pipe.

CARBON MONOXIDE POISONING HAZARD

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

DO NOT use cement to join polypropylene venting systems. Follow the polypropylene venting system manufacturer’s instructions for installing polypropylene venting systems.

! WARNING

440 01 4005 05 55

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 62 Combustion Air Pipe

12" (256mm) minimum to 60”(1524 mm) or 1 additional elbow maximum

CASING SIDE OR TOP ATTACHMENT

(NON-DIRECT VENT FOR ALL MODELS EXCEPT MODULATING UNLESS

COMBUSTION AIR PIPE

INSTALLED IN ATTIC OR CRAWL SPACE)

A13406

Installing the Vent Termination

Roof Terminations

A roof termination of any type will require a 4-in. (102 mm) flashing for a 2−in. (50 mm ND) concentric vent or a 5−in. (127 mm) diameter flashing for a 3-in. (80 mm ND) concentric vent kit. For two-pipe or single pipe vent systems, a flashing for each pipe of the required diameter will be necessary.

It is recommended that the flashing be installed by a roofer or competent professional prior to installing the concentric vent. The terminations can be installed on a flat or pitched roof.

Concentric Vent

Single or multiple concentric vent must be installed as shown in Figure 52. Maintain the required separation distance between vents or pairs of vents as shown in Figure 52 and all clearance shown in Figure 65.

CARBON MONOXIDE POISONING HAZARD

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

DO NOT use cement to join polypropylene venting systems. Follow the polypropylene venting system manufacturer’s instructions for installing polypropylene venting systems.

NOTE: Follow the instructions of the vent terminal manufacturer. These instructions are provided as a reference only.

Cut one 4−in. (102 mm) diameter hole for 2−in. (50 mm ND) kit, or one 5−in. (127 mm) diameter hole for 3−in. (80 mm ND) kit in the desired location.

Loosely assemble concentric vent/combustion air termination components together using instructions in kit.

Slide assembled kit with rain shield REMOVED through hole in wall or roof flashing.

NOTE: Do not allow insulation or other materials to accumulate inside of pipe assembly when installing it through hole.

Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping. DO NOT CEMENT POLYPROPYLENE FITTINGS.

WARNING

Two−Pipe and Single−Pipe Terminations

Single and two pipe vent must be installed as shown in Figure 52 and Figure 53. Maintain the required separation distance between vents or pairs of vents as shown in Figure 52 and Figure 53 and all clearance shown in Figure 65 or Figure 66.

NOTICE

Recommended Support for Vent Terminations

It is recommended that rooftop vent terminations in excess of 36 inches (1.0 M) in vertical length be supported by EITHER the Direct Vent Termination Kit shown in Table 12 or by field-supplied brackets or supports fastened to the structure.

Cut the required number of holes in the roof or sidewall for vent and (when used) combustion air pipes. Sidewall holes for two-pipe vent terminations should be side-by-side, allowing space between the pipes for the elbows to fit on the pipes.

Holes in the roof for direct−vent (two−pipe) terminations should be spaced no more than 18−in. (457 mm) apart to help avoid vent gas recirculation into combustion air intake.

Termination elbows will be installed after the vent and (if used) combustion air pipe is installed.

Sidewall Terminations

Concentric Vent

NOTE: Follow the instructions of the vent terminal

manufacturer. These instructions are provided as a reference, only.

Determine an appropriate location for termination kit using the guidelines provided in section “Locating The Vent Termination”

in this instruction.

1. Cut one 4−in. diameter hole for 2−in. kit, or one 5−in. diameter hole for 3−in. kit.

2. Loosely assemble concentric vent/combustion air termination components together using instructions in kit.

3. Slide assembled kit with rain shield REMOVED through hole.

NOTE: Do not allow insulation or other materials to accumulate inside of pipe assembly when installing it through hole.

4. Locate assembly through sidewall with rain shield positioned no more than 1−in. (25 mm) from wall as shown in Figure 52.

5. Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping. DO NOT CEMENT POLYPROPYLENE FITTINGS.

Two-Pipe and Single-Pipe Vent Termination

NOTE: Follow the instructions of the vent terminal

manufacturer. These instructions are provided as a reference, only.

NOTICE

Recommended Support for Vent Terminations

It is recommended that side−wall vent terminations in excess of 24 inches (0.6 M) in vertical length be supported by EITHER the Direct Vent Termination Kit in Table 12 or by field-supplied brackets or supports fastened to the structure.

Determine an appropriate location for termination kit using the guidelines provided in section “Locating The Vent Termination”

in this instruction.

56 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

1. Cut two holes, one for each pipe, of appropriate size for pipe size being used.

2. Loosely install elbow in bracket (if used) and place assembly on combustion−air pipe.

3. Install bracket as shown in Figure 49 and Figure 51.

NOTE: For applications using vent pipe option indicated by dashed lines in Figure 52 and Figure 53, rotate vent elbow 90_ from position.

4. Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping. DO NOT CEMENT POLYPROPYLENE FITTINGS.

(Direct Vent / Two-Pipe System ONLY)

When two or more furnaces are vented near each other, two vent terminations may be installed as shown in Figure 49 and Figure 51, but next vent termination, or pair of vent terminations, must be at least 36−in. (914 mm) away from first two terminations. It is important that vent terminations be made as shown in Figure 49 and Figure 51 to avoid recirculation of gases.

Inducer Outlet Restrictor

To improve efficiency and operation of 26K, 40K, 60K, or 100K BTUH input models on very short vent systems, an inducer outlet restrictor is required to be installed on the outlet of the inducer assembly. The outlet restrictor is shown in the footnote of Table 14 − Maximum Equivalent Vent Length. The outlet restrictor for 26K and 40K models is shipped in the loose parts bag. See Table 14 for usage, part numbers and sourcing of 26K, 40K, 60K and 100K inducer outlet restrictors.

To determine if the outlet restrictor is required, see Table 14.

Failure to use an outlet restrictor on the 40K model when required may result in flame disturbance or flame sense lockout.

To install the outlet restrictor:

1. Remove the vent elbow from the inducer outlet

2. Align the lock tabs on the outlet restrictor with the slots on inside outlet of the inducer assembly.

3. Snap the outlet restrictor in place.

4. Re-install the vent elbow

5. Torque vent elbow clamp 15 lb−in.

440 01 4005 05 57

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 63 Crawl Space Vent Termination

Ventilated Combustion Air intake pipe

Pipe hangar

3” (76 mm)

Ventilated Combustion Air intake termination in crawl

space

Figure 64 Attic Vent Termination

Vent through roof flashing

12” (305 mm)

CRAWL SPACE

Ventilated Combustion Air intake pipe

L11F016A

12” (305 mm) min. above higest level of insulation

ATTIC

58 440 01 4005 05

Specifications subject to change without notice.

L11F016B

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 65 Direct Vent Termination Clearance

25−24−65−2

NOTE: The following is based upon National codes for gas appliances, and is provided as a reference. Refer to Local codes which may supersede these standards and/or recommendations.

Item Clearance Description

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

B Clearance to a window or door that may be opened

C Clearance to a permanently closed window

Vertical clearance to a ventilated soffit located above the

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

E Clearance to an unventilated soffit F Clearance to an outside corner G Clearance to an inside corner

Clearance to each side of the centerline extended above

K Clearance to a mechanical air supply inlet 6 ft. (1.8 M) 3ft. (.9 M) above if within 10 ft. (3 M) horizontally

L Clearance under a veranda, porch, deck, or balcony

0 Clearance from a plumbing vent stack 3 ft. (.9 M) 3 ft. (.9 M)

u greater than, w greater than or equal to, t less than, v less than or equal to

electrical meter or gas service regulator assembly

I Clearance to service regulator vent outlet 3ft. (.9 M) See Note 4.

Clearance to non—mechanical air supply inlet to building or

the combustion air inlet to any other appliance

Clearance to each side of the centerline extended above or

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

vent, or other appliance's vent intake or exhaust

Furnace combustion air intake clearance to a water heater

vent, dryer vent or other types of appliance exhausts.

Clearance above paved sidewalk or paved driveway located

anticipated snow level

the centerline of the terminal

on public property

12 in. (305 mm) for appliances >10,000 Btuh (3 kW)

36 in. (914 mm) for appliances >100,000 Btuh (30 kW)

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

12 in. (305 mm) for appliances >10,000 Btuh(3 kW)

36 in. (914 mm) for appliances >100,000 Btuh (30 kW)

Permitted only if veranda, porch, deck, or balcony is fully open on a

Vent shall not terminate above a sidewalk or paved driveway that is

located between two single family dwellings and serves both

Canadian Installations

(per CAN/CSA B149.1)

12 in. (305 mm)

18 in. (457 mm) above roof surface.

and </=100,000 Btuh ( 30 kW),

installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.

3 ft. (.9 M) within 15 ft. (4.6 M)

above the meter/regulator assembly.

and </= 100,000 Btuh ( 30 kW),

12 in. (305 mm).

minimum of two sides beneath the floor.

12 in. (305 mm) 12 in. (305 mm)

3 ft. (.9 M) 3 ft. (.9 M)

7 ft. (2.1 M)

dwellings.

Notes:

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

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

3. NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.

Refer to Local codes which may supersede these standards and/or recommendations.

4. For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.

5. 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, vent termination icing, and/or accelerated corrosion of the heat exchangers.

6. Design and position vent outlets to avoid ice buildup on and moisture damage to surrounding surfaces.

7. The vent for this appliance shall not terminate:

a. Near soffit vents of crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or b. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.

8. Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice buildup may occur.

440 01 4005 05 59

Specifications subject to change without notice.

(1 )

(per ANSI Z223.1/NFPA 54)

9 in. (229 mm) for appliances >10,000 Btuh (3 kW)

and </= 50,000 Btuh ( 15 kW),

12 in. (305 mm) for appliances >50,000 Btuh (15kW)

Manufacturer's Recommendation: See Notes 38.

3 ft. (.9 M) within 15 ft. (4.6 M)

above the meter/regulator assembly.

9 in. (9 mm) for appliances >10,000 Btuh (3 kW)

and </= 50,000 Btuh (15 kW),

12 in.(305 mm) for appliances >50,000 Btuh (15kW)

Manufacturer's Recommendation: See Notes 38.

U.S. Installations

12 in. (305 mm)

See Note 4.

(2 )

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Figure 66 Other than Direct Vent Clearance − Ventilated Combustion Air Option

25−24−65−2

NOTE: The following is based upon National codes for gas appliances, and is provided as a reference. Refer to Local codes which may supersede these standards and/or recommendations.

Item

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

B Clearance to a window or door that may be opened

C Clearance to a permanently closed window

Vertical clearance to a ventilated soffit located above the

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

E Clearance to an unventilated soffit F Clearance to an outside corner G Clearance to an inside corner

Clearance to each side of the centerline extended above

I Clearance to service regulator vent outlet 3ft. (.9 M) See Note 4.

K Clearance to a mechanical air supply inlet 6 ft. (1.8 M) 3ft. (.9 M) above if within 10 ft. (3 M) horizontally

L Clearance under a veranda, porch, deck, or balcony

0 Clearance from a plumbing vent stack 3 ft. (.9 M) 3 ft. (.9 M)

u greater than, w greater than or equal to, t less than, v less than or equal to

electrical meter or gas service regulator assembly

Clearance to non—mechanical air supply inlet to building or

the combustion air inlet to any other appliance

Clearance to each side of the centerline extended above or

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

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

Clearance above paved sidewalk or paved driveway located

Clearance Description

anticipated snow level

the centerline of the terminal

Clearance to a moisture exhaust duct

(dryer vent, spa exhaust, etc.)

on public property

12 in. (305 mm) for appliances >10,000 Btuh (3 kW)

36 in. (914 mm) for appliances >100,000 Btuh (30 kW)

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

12 in. (305 mm) for appliances >10,000 Btuh(3 kW)

36 in. (914 mm) for appliances >100,000 Btuh (30 kW)

Permitted only if veranda, porch, deck, or balcony is fully open

Vent shall not terminate above a sidewalk or paved driveway

that is located between two singlefamily dwellings and serves

Canadian Installations

(per CAN/CSA B149.1)

12 in. (305 mm)

18 in. (457 mm) above roof surface.

and </=100,000 Btuh ( 30 kW),

installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.

3 ft. (.9 M) within 15 ft. (4.6 M)

above the meter/regulator assembly.

and </= 100,000 Btuh ( 30 kW),

12 in. (305 mm).

on a minimum of two sides beneath the floor.

12 in. (305 mm) 12 in. (305 mm)

12 in. (305 mm) See Note 4. 12 in. (305 mm) See Note 4.

7 ft. (2.1 M).

both dwellings.

Notes:

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

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

3. NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.

Refer to Local codes which may supersede these standards and/or recommendations.

5. 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 condensation problems, vent termination icing, and/or accelerated corrosion of the heat exchangers.

6. Design and position vent outlets to avoid ice buildup on and moisture damage to surrounding surfaces.

7. The vent for this appliance shall not terminate:

8. These National standards apply to all nondirectvent gas appliances. Contact Local code officials for additional requirements and/or exclusions.

(1 )

Manufacturer's Recommendation: See Notes 38.

(per ANSI Z223.1/NFPA 54)

4ft. (1.2M) below or to the side of the opening,

1 ft (.3M) above the opening.

Manufacturer's Recommendation: See Note 8.

3 ft. (.9 M) within 15 ft. (4.6 M)

above the meter/regulator assembly.

4ft. (1.2M) below or to the side of the opening,

1 ft (.3M) above the opening.

Manufacturer's Recommendation: See Note 8

Manufacturer's Recommendation: See Notes 38.

U.S. Installations

12 in. (305 mm)

See Note 4.

7ft. (2.1M)

(2 )

60 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 14 (F/G)9MXE − MAXIMUM EQUIVALENT VENT LENGTH - Feet \ Meters

Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations

Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application.

Unit Size 26,000

Pipe Dia.

(in)

02000 70 200 40 155 185 20013000 65 190 35 150 175 95 165 185 30014000 60 175 30 135 160 16 90 155 175 115 155 175 40014500 45015000 125 145 80 145 165 145 160 50016000 50 145 20 120 130 75 140 155 41 100 135 150 140 155 155 60017000 45 135 15 110 120 13 70 130 145

Altitude (feet)

70018000 40 120 80019000 35 110 90 95 5 60 115 125 33 80 110 115 50 115 125 43 120

900110000 30 95 5 80 85 N/A 55 105 115 30 75 100 105 45 100 115 39 115

1 ½ 2 1 ½ 2 2 ½ 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 4 2 2 ½ 3 4 2 ½ 3 4

55 160 25

40,000

130 155

100 110 10 65 120 135 36 120 125

Single-Stage 95% - Feet/inches

60,000

100 175 200 15 55 130 175 200 20 80 175 200

85 150 170

N/A

80,000 100,000 120,000

125 165 185

44 110

15 75

150 165

125 140 60 135 145 50 140

N/A

165 185 70 175

175 5 65 165

155

70 170

150 165

55 125 135 46 130

N/A

75 185

160

Unit Size 26,000

Pipe Dia.

(mm)

0610 21.3 60.9 12.1 47.2 56.3

611914 19.8 57.9 10.6 45.7 53.3 28.9 50.2 56.3

9151219 18.2 53.3 9.1 41.1 48.7 4.8 27.4 47.2 53.3 35.0 47.2 53.3 12201370 13711524 38.1 44.1 24.3 44.1 50.2 44.1 48.7 15251829 15.2 44.1 6.0 36.5 39.6 22.8 42.6 47.2 12.4 30.4 41.1 45.7 42.6 47.2 47.2 18302134 13.7 41.1 4.5 33.5 36.5 3.9 21.3 39.6 44.1 21352438 12.1 36.5

Altitude (meters)

24392743 10.6 33.5 27.4 28.9 1.5 18.2 35.0 38.1 10.0 24.3 33.5 35.0 15.2 35.0 38.1 13.1 36.5 27443048 9.1 28.9 1.5 24.3 25.9 NA 16.7 32.0 35.0 9.1 22.8 30.4 32.0 13.7 30.4 35.0 11.8 35.0

38 51 38 51 64 38 51 64 76 38 51 64 76 102 51 64 76 102 64 76 102

16.7 48.7 7.6

3.0

40,000

6.0

39.6 47.2

30.4 33.5 3.0 19.8 36.5 41.1 10.9 36.5 38.1

4.5

Single-Stage 95% - Meters/mm

60,000

30.4 53.3 60.9 4.5 16.7 39.6 53.3 60.9 6.0 24.3 53.3 60.9

25.9 45.7 51.8

3.0

80,000 100,000 120,000

38.1 50.2 56.3

14.9

13.4 33.5

11.5

27.4

4.5 22.8

45.7 50.2

3.0

38.1 42.6 18.2 41.1 44.1 15.2 42.6

50.2 56.3 21.3 53.3

53.3 1.5 19.8 50.2

47.2

21.3 51.8

45.7 50.2

19.8

16.7 38.1 41.1 14.0 39.6

3.0

22.8 56.3

18.2

1.40K inducer outlet restrictor Inducer Outlet Restrictor disk (PN 1185623; 1.25−in (32−mm) dia.) shipped in the loose parts bag or available through FAST Parts and is required under 10−ft (3.0−m) TEVL in all orientations. Required for installations from 0 to 2000 ft. (0 to 610 M) above sea level. Failure to use an outlet restrictor may result in flame disturbance or flame sense lock−out.

2.26K and 60K inducer outlet restrictor Inducer Outlet Restrictor disk (PN 1185623; 1.25−in (32−mm) dia.) 26K shipped in the loose parts bag or available through FAST Parts and is required for no greater than 5−ft (1.5−m) TEVL in downflow and horizontal orientations only. Required for installations from 0 to 2000 ft. (0 to 610 M) above sea level.

(F/G)9MXT − MAXIMUM EQUIVALENT VENT LENGTH - Feet \ Meters

Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations

Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application.

Unit Size 40,000

Pipe Dia. (in) 1 ½ 2 2 ½ 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 4 2 2 ½ 3 4 2 ½ 3 4

02000 40 155 185 20013000 35 150 175 95 165 185 30014000 30 135 160 16 90 155 175 115 155 175 40014500 45015000 125 145 80 145 165 145 160 50016000 20 120 130 75 140 155 41 100 135 150 140 155 155 60017000 15 110 120 13 70 130 145

Altitude (feet)

70018000 80019000 90 95 5 60 115 125 33 80 110 115 50 115 125 43 120

900110000 5 80 85 N/A 55 105 115 30 75 100 105 45 100 115 39 115

Unit Size 40,000

Pipe Dia. (mm) 38 51 64 38 51 64 76 38 51 64 76 102 51 64 76 102 64 76 102

0610 12.1 47.2 56.3

611914 10.6 45.7 53.3 28.9 50.2 56.3

9151219 9.1 41.1 48.7 4.8 27.4 47.2 53.3 35.0 47.2 53.3 12201370 13711524 38.1 44.1 24.3 44.1 50.2 44.1 48.7 15251829 6.0 36.5 39.6 22.8 42.6 47.2 12.4 30.4 41.1 45.7 42.6 47.2 47.2 18302134 4.5 33.5 36.5 3.9 21.3 39.6 44.1 21352438

Altitude (meters)

24392743 27.4 28.9 1.5 18.2 35.0 38.1 10.0 24.3 33.5 35.0 15.2 35.0 38.1 13.1 36.5 27443048 1.5 24.3 25.9 NA 16.7 32.0 35.0 9.1 22.8 30.4 32.0 13.7 30.4 35.0 11.8 35.0

7.6

3.0

130 155

100 110 10 65 120 135 36 120 125

39.6 47.2

30.4 33.5 3.0 19.8 36.5 41.1 10.9 36.5 38.1

60,000

100 175 200 15 55 130 175 200 20 80 175 200

85 150 170

60,000

30.4 53.3 60.9 4.5 16.7 39.6 53.3 60.9 6.0 24.3 53.3 60.9

6.0

25.9 45.7 51.8

4.5

2.60K inducer outlet restrictor Inducer Outlet Restrictor disk (PN 1185623; 1.25−in (32−mm) dia.) available through FAST Parts and is required for no greater than 5−ft (1.5−m) TEVL in downflow and horizontal orientations only. Required for installations from 0 to 2000 ft. (0 to 610 M) above sea level.

3.100K inducer outlet restrictor Inducer Outlet Restrictor disk (PN 1188589; 1.50−in (38−mm) dia.) available through FAST Parts and is required for no greater than 5−ft (1.5−m) TEVL in downflow and horizontal orientations only. Required for installations from 0 to 2000 ft. (0 to 610 M) above sea level.

Two-Stage PWM - Feet/inches

44 110

N/A

Two-Stage PWM - Meters/mm

14.9

3.0

13.4 33.5

11.5

80,000 100,000

125 165 185

150 165

125 140 60 135 145 50 140

80,000 100,000

38.1 50.2 56.3

45.7 50.2

38.1 42.6 18.2 41.1 44.1 15.2 42.6

27.4

15 75

N/A

4.5 22.8

3.0

165 185 70 175

175 5 65 165

155

70 170

150 165

55 125 135 46 130

50.2 56.3 21.3 53.3

53.3 1.5 19.8 50.2

47.2

21.3 51.8

45.7 50.2

19.8

16.7 38.1 41.1 14.0 39.6

N/A

3.0

120,000

75 185

120,000

22.8 56.3

18.2

48.7

160

48.7

440 01 4005 05 61

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 15 DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)

Pipe Diameter (in): 11/2 2 21/2 3 4

Mitered 90º Elbow 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4)

Medium Radius 90º Elbow 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5)

Long Radius 90º Elbow 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9)

Mitered 45º Elbow 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2)

Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8)

Long Radius 45º Elbow 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5)

Tee 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9)

Concentric Vent Termination NA 0 (0.0) NA 0 (0.0) NA

Standard Vent Termination 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)

NOTES:

1. Use only the smallest diameter pipe possible for venting. Over−sizing may cause flame disturbance or excessive vent terminal icing or freeze−up.

2. NA = Not allowed. Pressure switch will not close, or flame disturbance may result.

3. Not all furnace families include 26,000 or 140,000 BTUH input models.

4. Vent sizing for Canadian installation over 4500 ft. (1370 m) above sea level are subject to acceptance by local authorities having jurisdiction.

5. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.

6. Assume two 45° degree elbows equal one 90° degree elbow. Wide radius elbows are desirable and may be required in some cases.

7. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.

8. The minimum pipe length is 5 (1.5) linear feet (meters) for all applications.

9. Use 3−in (76 mm) diameter vent termination kit for installations requiring a 4−in (102 mm) diameter pipe.

Figure 67 Elbows Configurations

LONG

MEDIUM MITERED

L11F082

Figure 68 Vent Terminal Configurations

STANDARD 2−IN., 3−IN. OR OPTIONAL 4−IN. TERMINATION

L11F083

A13110

62 440 01 4005 05

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Venting System Length Calculations

The Total Equivalent Vent Length for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent length of elbows used in the venting system from Table 15. Standard vent terminations or factory accessory concentric vent terminations count for zero deduction. See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME that one foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe. Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 14.

Example 1

A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE: 70 feet (22 M) of vent pipe, 65 feet (20 M) of combustion air inlet pipe, (3) 90º long-radius elbows, (2) 45º long-radius elbows, and a factory accessory concentric vent kit.

Can this application use 2-in. (50 mm ND) PVC/ABS DWV vent piping?

Measure the required linear length of air inlet and vent pipe; insert the longest of the two here Add equiv length of (3) 90º long-radius elbows (use the highest number of elbows for either the vent or inlet pipe)

Add equiv length of (2) 45º long-radius elbows (use the highest number of elbows for either the vent or inlet pipe)

Add equiv length of factory concentric vent term 0 ft. From Table 15

Add correction for flexible vent pipe, if any 0 ft.

Total Equivalent Vent Length (TEVL)

3 x

2 x

3 ft

(0.9 M)

1.5 ft

(0.5 M)

70 ft.

(22 M)

9 ft.

(2.7 M)

3 ft.

(0.9 M)

82 ft.

(25 M)

Use length of the longer of the vent or air inlet piping system

From Table 15

From Vent Manufacturer’s instructions; zero for PVC/ABS DWV

Add all of the above lines

Maximum Equivalent Vent Length (MEVL)

Is TEVL less than MEVL? YES Therefore, 2” pipe MAY be used

95 ft.

(29 M)

For 2” pipe from Table 14

Example 2

A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE: 50 feet (15 M) of vent pipe, 45 feet (14 M) of combustion air inlet pipe, (3) 90º long-radius elbows, and a polypropylene concentric vent kit. Also includes 20 feet (6.1 M) of flexible polypropylene vent pipe, included within the 50 feet (15 M) of vent pipe.

VERIFY FROM POLYPROPYLENE VENT MANUFACTURER’S INSTRUCTIONS for the multiplier correction for flexible vent pipe. Can this application use 60mm (o.d.) polypropylene vent piping? If not, what size piping can be used?

Measure the required linear length of RIGID air inlet and vent pipe; insert the longest of the two here: 100 ft. Of rigid pipe − 20 ft. of flexible pipe

Add equiv length of (3) 90º long-radius elbows (use the highest number of elbows for either the vent or inlet pipe)

Add equiv length of 45º long-radius elbows (use the highest number of elbows for either the vent or inlet pipe)

Add equiv length of concentric vent term 9 x

Add correction for flexible vent pipe, if any 2* x

* VERIFY FROM VENT MANUFACTURER’S INSTRUCTIONS; For example only, assume 1 meter of flexible 60mm (2”) or 80mm (3”) polypropylene pipe equals 2 meters (6.5 ft.) of PVC/ABS pipe.

Total Equivalent Vent Length (TEVL)

Maximum Equivalent Vent Length (MEVL)

Is TEVL less than MEVL? NO

Maximum Equivalent Vent Length (MEVL)

Is TEVL less than MEVL? YES

3 x

0 x =

5 ft

(1.5 M)

3.3 ft

(0.9 M)

20 ft.

(6.1 M)

= 80 ft.

(24 M)

15 ft.

(4.6 M)

0 ft.

(0 M)

30 ft.

(9 M)

40 ft.

(12.2 M)

165 ft. (50 M)

95 ft.

(29 M)

185 ft. (57 M)

Use length of the longer of the vent or air inlet piping system

Example from polypropylene vent

manufacturer’s instructions. Verify from

vent manufacturer’s instructions.

Add all of the above lines

For 2” pipe from Table 14

Therefore, 60mm (2”) pipe may NOT be used; try 80mm (3”)

For 3” pipe from Table 14

Therefore, 80mm (3”) pipe MAY be used

440 01 4005 05 63

Specifications subject to change without notice.

INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE

Table 16 Maximum Allowable Exposed Vent Lengths Tables

Maximum Allowable Exposed Vent Length in Unconditioned Space (Feet)

Unit Size

Pipe Dia.

in.

Winter

Design

Temp

°F

Winter

Design

Temp

°F

Winter

Design

Temp

°F

Winter

Design

Temp

°F

* Not all families have these models

20 40

Unit Size

Pipe Dia.

in.

20 40

Unit Size 100,000 BTUH

Pipe Dia.

in.

20 20 50 40 35 20 80 95 80 20 80 105 90

20 15 10 5 20 35 30 20 20 45 35 25 40 10 5 20 25 20 10 20 30 25 15

Unit Size Pipe Dia.

in.

20 10 50 40 10 75 95 10 75 105 5 55 50 5 65 105 5 65 125

-20 10 10 10 35 25 10 45 30 5 10 5 5 45 30 5 50 40

-40 10 5 10 25 15 10 30 20 5 5 5 30 20 5 35 25

Uninsulated 3/8-in. Insulation 1/2-in. Insulation

1½ 2 1½ 2 1½ 2 1 ½ 2 2 ½ 1 ½ 2 2 ½ 1 ½ 2 2 ½

20 20 50 45 60 50

0 20 20 15 10 20 55 45 35 20 65 55 45

0 10 20 15 10 55 45 10 65 50 5 25 15 5 65 50 5 65 60

5 5 25 20 30 25

Uninsulated 3/8in. Insulation 1/2in. Insulation

1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4

20 30 30 25 20 75 65 60 20 85 75 65 15 15 10 10 20 40 30 25 20 45 40 30 10 5 20 25 20 15 20 30 25 20

5 20 15 15 10 20 20 15 10

2 2 ½ 3 4 2 2 ½ 3 4 2 2 ½ 3 4

Uninsulated 3/8in. Insulation 1/2in. Insulation Uninsulated 3/8in. Insulation 1/2in. Insulation

2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4

Maximum Allowable Exposed Vent Length in Unconditioned Space (Metric)

Unit Size

Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated

Pipe Dia.

Winter

Design

Temp

°C

Winter Design

Temp °C

Winter

Design

Temp

°C

Winter

Design

Temp

°C

* Not all families have these models

-7 6.1 6.1 15.2 13.7 18.3 15.2

-18 1.5 1.5 7.6 6.1 9.1 7.6

-29 4.6 3.0 6.1 4.6

-40 3.0 1.5 4.6 3.0

Unit Size 60,000 BTUH 80,000 BTUH

Pipe Dia.

-7 6.1 9.1 9.1 7.6 6.1 22.9 19.8 18.3 6.1 25.9 22.9 19.8 4.6 12.2 12.2 10.7 9.1 4.6 15.2 27.4 22.9 19.8 4.6 15.2 21.3 21.3 21.3

-18 4.6 4.6 3.0 3.0 6.1 12.2 9.1 7.6 6.1 13.7 12.2 9.1 4.6 6.1 4.6 3.0 1.5 4.6 15.2 13.7 10.7 9.1 4.6 15.2 15.2 12.2 10.7

-29 3.0 1.5 6.1 7.6 6.1 4.6 6.1 9.1 7.6 6.1 4.6 3.0 1.5 4.6 10.7 9.1 6.1 4.6 4.6 12.2 9.1 7.6 4.6

-40 1.5 6.1 4.6 4.6 3.0 6.1 6.1 4.6 3.0 3.0 1.5 4.6 7.6 6.1 4.6 1.5 4.6 9.1 7.6 6.1 3.0

Unit Size 100,000 BTUH

Pipe Dia.

-7 6.1 15.2 12.2 10.7 6.1 24.4 28.9 24.4 6.1 24.4 32.0 27.4

-18 6.1 6.1 4.6 3.0 6.1 16.8 13.7 10.7 6.1 19.8 16.7 13.7

-29 4.6 3.0 1.5 6.1 10.7 9.1 6.1 6.1 13.7 10.7 7.6

-40 3.0 1.5 6.1 7.6 6.1 3.0 6.1 9.1 7.6 4.6

Unit Size 120,000 BTUH 140,000* BTUH

Pipe Dia.

-7 3.0 15.2 12.2 3.0 22.9 28.9 3.0 22.9 32.0 1.5 16.7 15.2 1.5 19.8 32.0 1.5 19.8 38.1

-18 3.0 6.1 4.6 3.0 16.8 13.7 3.0 19.8 15.2 1.5 7.6 4.6 1.5 19.8 15.2 1.5 19.8 18.3

-29 3.0 3.0 3.0 10.7 7.6 3.0 13.7 9.1 1.5 3.0 1.5 1.5 13.7 9.1 1.5 15.2 12.2 40 3.0 1.5 3.0 7.6 4.6 3.0 9.1 6.1 1.5 1.5 1.5 9.1 6.1 1.5 35 7.6

38 51 38 51 38 51 38 51 64 38 51 64 38 51 64

Uninsulated 3/8in. Insulation 1/2in. Insulation Uninsulated 3/8in. Insulation 1/2in. Insulation

38 51 64 76 38 51 64 76 38 51 64 76 38 51 64 76 102 38 51 64 76 102 38 51 64 76 102

51 64 76 102 51 64 76 102 51 64 76 102

Uninsulated 3/8in. Insulation 1/2in. Insulation Uninsulated 3/8in. Insulation 1/2in. Insulation

64 76 102 64 76 102 64 76 102 64 76 102 64 76 102 64 76 102

26,000* BTUH

15 10 20 15 10 5 15 10

60,000 BTUH

Uninsulated 3/8in. Insulation 1/2in. Insulation

120,000 BTUH 140,000* BTUH

26,000* BTUH

Uninsulated 3/8in. Insulation 1/2in. Insulation

20 20 20 20 50 45 20 60 50 10 5 5 20 25 20 20 30 25 5 20 15 10 20 20 15 15 10 5 15 15 10

Uninsulated 3/8in. Insulation 1/2in. Insulation

15 40 40 35 30 15 50 90 75 65 15 50 70 70 70 15 20 15 10 5 15 50 45 35 30 15 50 50 40 35 15 10 5 15 35 30 20 15 15 40 30 25 15 10 5 15 25 20 15 5 15 30 25 20 10

6.1 6.1 6.1 6.1 15.2 13.7 6.1 18.3 15.2

3.0 1.5 1.5 6.1 7.6 6.1 6.1 9.1 7.6

1.5 6.1 4.6 3.0 6.1 6.1 4.6

40,000* BTUH

80,000 BTUH

40,000* BTUH

3/8in. Insulation 1/2in. Insulation

4.6 3.0 1.5 4.6 4.6 3.0

Lewisburg, TN 37091 USA

64 440 01 4005 05

Specifications subject to change without notice.

ICP F9MXE0601714A1, G9MXE0401410A1, G9MXE0601714A1, G9MXE0801716A1, G9MXE1002116A1 Installation Guide

Specifications and Main Features

Frequently Asked Questions

User Manual