International comfort products C9MVX, H9MPV, C9MPV, T9MPV, C9MPT Installation Instructions Manual

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Page 1

INSTALLATION INSTRUCTIONS

90+ Two−Stage & Two−Stage, Variable

Category IV, Gas Furnace

C9MVX, H9MVX, T9MVX, C9MPV, H9MPV,

(Upflow/Downflow/Horizontal)

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

T9MPV, C9MPT, H9MPT, T9MPT

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

Start-up Check Sheets 3.................................

Safety considerations 5...................................

Safe Installation Requirements 5.............................

Installation 7...........................................

Combustion & Ventilation Air 11..............................

Vent and Combustion Air Piping 15............................

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

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

Electrical Wiring 37.......................................

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

Checks and Adjustments 43.................................

Furnace Maintenance 46...................................

Sequence of Operation & Diagnostics (*9MPT) 47.................

Wiring Diagram *9MPT (Two-Stage Heating with PSC Motor) 49.......

Sequence of Operation & Diagnostics (*9MPV, *9MVX) 50...........

Wiring Diagram *9MPV, *9MVX (Variable Speed Blower Motor) 52......

Thermostat Wiring Guide 53.................................

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 .

International Comfort Products, LLC

Lewisburg, TN 37091 U.S.A.

www.icpusa.com

Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2009©, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington, DC

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

Specifications are subject to change without notice.

PERSONAL INJURY, AND/OR PROPERTY DAMAGE HAZARD

Failure to carefully read and follow this warning could result in equipment malfunction, property damage, personal injury and/or death. Installation or repairs made by unqualified persons could result in equipment malfunction, property damage, personal injury and/or death. The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with proper tools and test instruments. Installation must conform with local building codes and with the Natural Fuel Gas Code (NFCG) NFPA 54/ANSI Z223.1, and National standards of Canada CAN/CSA−B149.1 and .2 Natural Gas and Propane Installation Codes.

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

WARNING

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Page 2

Required Notice for Massachusetts Installations

Important

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

5.08: Modifications to NFPA−54, Chapter 10

2) Revise 10.8.3 by adding the following additional requirements:

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

purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back−up is installed on the floor level where the gas equipment is to be installed. in addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified license professionals for the installation of hard wired carbon monoxide detectors.

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

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

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

of thirty (30) days to comply with the above requirement; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one−half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. INSPECTION. The state of local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a) 1 through 4.

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

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

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes.

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

horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include:

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

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

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

side wall horizontally vented gas fueled equipment does not provide the parts for venting the flue gases, but identifies “special venting systems”, the following requirements shall be satisfied by the manufacturer:

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

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

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

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

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

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

Specifications are subject to change without notice.

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START−UP CHECK SHEET

For PSC Models *9MPT

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

Date of Start−Up:

Dealer Name:

Address:

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

Phone:

Owner Name:

Address:

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

Model Number:

Serial Number:

Setup Checks

Check the box when task is complete.

All Electrical Connections Tight?

Have hoses been relocated for furnace U/D/H

application?

Calculated Input (BTU) Rate: (See Checks and

Adjustments Section).

Heating Check

Measured Line Pressure During High Heat:

Measured Manifold Pressure: High Heat

Low Heat

Temperature of Supply Air: High Heat

Low Heat

Temperature of Return Air:

Temperature Rise (Supply − Return): High Heat

Low Heat

In Rise Range (see furnace rating plate)?

Static Pressure (Ducts) High Heat: Supply

Return

The Blower Speed Tap used for: High Heat

Low Heat

Optional Check: CO?

CO2?

Cooling Check

Condensate Drain Connected?

Condensate Drain Trapped?

Manual Gas Shut−off Upstream of Furnace/Drip Leg

Gas Valve turned ON?

Type of Gas: Natural: Propane:

Filter Type and Size:

Shade in Heating Fan “Time OFF” Setting and Thermostat Type setting:

Temperature of Supply Air:

Temperature of Return Air:

Temperature Difference:

Static Pressure (Ducts) Cooling: Supply

Return

The Blower Speed Tap used for: Cooling

Dealer Comments:

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Specifications are subject to change without notice.

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START−UP CHECK SHEET

For Variable Speed Models *9MPV, *9MVX

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

Date of Start−Up:

Dealer Name:

Address:

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

Phone:

Owner Name:

Address:

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

Model Number:

Serial Number:

Setup Checks

Check the box when task is complete.

Calculated Input (BTU) Rate: (See Checks and

Adjustments Section).

Heating Check

Measured Line Pressure During High Heat:

Measured Manifold Pressure: High Heat

Low Heat

Temperature of Supply Air: High Heat

Low Heat

Temperature of Return Air:

Temperature Rise (Supply − Return): High Heat

Low Heat

In Rise Range (see furnace rating plate)?

Static Pressure (Ducts) High Heat: Supply

Return

All Electrical Connections Tight?

Have hoses been relocated for furnace U/D/H

application?

Condensate Drain Connected?

Condensate Drain Trapped?

Manual Gas Shut−off Upstream of Furnace/Drip Leg

Gas Valve turned ON?

Type of Gas: Natural: Propane:

Filter Type and Size:

Shade in Final Furnace Settings Below:

Optional Check: CO?

CO2?

Cooling Check

Temperature of Supply Air:

Temperature of Return Air:

Temperature Difference:

Static Pressure (Ducts) Cooling: Supply

Return

Dealer Comments:

Specifications are subject to change without notice.

440 01 2024 04

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SAFETY CONSIDERATIONS

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

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

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

Recognize safety information. This is the safety−alert symbol . When you see this symbol on the unit and in

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

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.

CARBON MONOXIDE POISONING AND FIRE HAZARD

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

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

CUT HAZARD

Failure to follow this caution may result in damage personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

WARNING

CAUTION

Safe Installation Requirements

FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING HAZARD

Improper adjustment, alteration, service, maintenance or installation could cause personal injury, death and/or property damage.

Installation or repairs made by unqualified persons could result in hazards to you and others. Installation MUST conform with local codes or, in the absence of local codes, with codes of all governmental authorities having jurisdiction.

The information contained in this manual is intended for use by a qualified service agency that is experienced in such work, is familiar with all precautions and safety procedures required in such work, and is equipped with the proper tools and test instruments.

NOTE: This furnace is design−certified by the CSA International

(formerly AGA and CGA) for installation in the United States and Canada. Refer to the appropriate codes, along with this manual, for proper installation.

WARNING

• Use only the Type of gas approved for this furnace (see

Rating Plate on unit). Overfiring will result in failure of heat exchanger and cause dangerous operation. (Furnaces can be converted to Propane gas with approved kit.)

• Install this furnace only in a location and position as

specified in “Installation” of these instructions.

• Provide adequate combustion and ventilation air to the

furnace as specified in “Combustion and Ventilation Air” of these instructions.

• Combustion products must be discharged outdoors.

Connect this furnace to an approved vent system only, as specified in “Combustion and Ventilation Air, Horizontal Venting and Masonry Chimney Venting” of these instructions.

• Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically for the detection of leaks to check all connections, as specified in “Gas Supply and Piping, Final Gas Piping Check” of these instructions.

• Always install furnace to operate within the furnace’s

intended temperature−rise range with a duct system which has an external static pressure within the allowable range, as specified in “Technical Support Manual” of these instructions. See furnace rating plate.

440 01 2024 04

Specifications are subject to change without notice.

Page 6

• When a furnace is installed so that supply ducts carry air

circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

• A gas−fired furnace for installation in a residential garage

must be installed as specified in “Installation Requirements” of these instructions.

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

buildings or structures under construction.

• This furnace is NOT approved for installation in

mobile homes, trailers or recreation vehicles.

• Seal around supply and return air ducts.

• Install correct filter type and size.

• Unit MUST be installed so electrical components are

protected from direct contact with water.

Safety Rules

Your unit is built to provide many years of safe and dependable service providing it is properly installed and maintained. However, abuse and/or improper use can shorten the life of the unit and create hazards for you, the owner.

A. The U.S. Consumer Product Safety Commission encourages

installation of carbon monoxide alarms. There can be various sources of carbon monoxide in a building or dwelling. The sources could be gas−fired clothes dryers, gas cooking stoves, water heaters, furnaces, gas−fired fireplaces, wood fireplaces.

Carbon monoxide can cause serious bodily injury and/or death. Carbon monoxide or “CO” is a colorless and odorless gas produced when fuel is not burned completely or when the flame does not receive sufficient oxygen.

Therefore, to help alert people of potentially dangerous carbon monoxide levels, you should have a commercially available carbon monoxide alarm that is listed by a nationally recognized testing agency in accordance with Underwriters Laboratories Inc. Standard for Single and Multiple Station Carbon Monoxide Alarms, ANSI/UL 2034 or the CSA 6.19−01 Residential Carbon Alarming Devices installed and maintained in the building or dwelling concurrently with the gas−fired furnace installation (see Note below). The alarm should be installed as recommended by the alarm manufacturer’s installation instructions.

B. There can be numerous sources of fire or smoke in a building

or dwelling. Fire or smoke can cause serious bodily injury, death, and/or property damage. Therefore, in order to alert people of potentially dangerous fire or smoke, you should have fire extinguisher and smoke alarms listed by Underwriters Laboratories installed and maintained in the building or dwelling (see Note below).

Note: The manufacturer of your furnace does not test any alarms

and makes no representations regarding any brand or type of alarms.

C. To ensure safe and efficient operation of your unit, you should

do the following:

1. Thoroughly read this manual and labels on the unit. This

will help you understand how your unit operates and the hazards involved with gas and electricity.

2. Do not use this unit if any part has been under water.

Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water.

3. Never obstruct the vent grilles, or any ducts that provide air to the unit. Air must be provided for proper combustion and ventilation of flue gases.

Frozen Water Pipe Hazard

WATER DAMAGE TO PROPERTY HAZARD

FaiIure to follow this caution may result in property damage.

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

Your furnace is designed solely to provide a safe and comfortable living environment. The furnace is NOT designed to ensure that water pipes will not freeze. It is equipped with several safety devices that are designed to turn the furnace off and prevent it from restarting in the event of various potentially unsafe conditions.

If your furnace remains off for an extended time, the pipes in your home could freeze and burst, resulting in serious water damage.

If the structure will be unattended during cold weather you should take these precautions.

1. Turn off the water supply to the structure and drain the water lines if possible and add an antifreeze for potable water to drain traps and toilet tanks. Open faucets in appropriate areas.

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

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

Winter Shutdown

If you go away during the winter months and do not leave the heat on in your home, the plastic transition box and the condensate trap on the furnace must be protected from freeze damage.(See Figure 11 trough Figure 20)

1. Disconnect the drain fitting that is located downstream of the combustion blower. Insert a funnel into the hose and pour four(4) ounces of sanitary type (RV) antifreeze into the condensate trap. Reconnect the the vent drain fitting. Secure with the hose clamp.

2. Disconnect the condensate trap. Insert a funnel into the hose and and pour four(4) ounces of sanitary type (RV) antifreeze into the plastic Transition box. Squeeze the hose together near the end and quickly reconnect the hose to the stub on the condensate trap. Secure with the hose clamp.

When you return home, your furnace will be ready to start, as it is not necessary to drain the antifreeze from the furnace.

CAUTION

−or−

/8″ (15.9mm) OD rubber hose from the vent

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

/4″ (19.1mm) OD rubber hose from the

/4″ (19.1mm) OD rubber

Specifications are subject to change without notice.

440 01 2024 04

Page 7

Installation

WARNING

CARBON MONOXIDE POISONING HAZARD

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

This furnace can NOT be common vented or connected to any type B, BW or L vent or vent connector, nor to any portion of a factory−built or masonry chimney. If this furnace is replacing a previously common-vented furnace, it may be necessary to resize the existing vent and chimney to prevent oversizing problems for the other remaining appliance(s). See Venting and

Combustion Air Check in the Combustion & Ventilation Air section. This furnace MUST be

vented to the outside.

Installation Positions

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

Location and Clearances

1. Refer to Figure 1 or Figure 2 for typical installation and basic connecting parts required. Refer to Figure 3 for typical horizontal direct vent installation and basic connecting parts required. Supply and return air plenums and duct are also required.

2. If furnace is a replacement, it is usually best to install the furnace where the old one was. Choose the location or evaluate the existing location based upon the minimum clearance and furnace dimensions (Figure 4).

! CARBON MONOXIDE POISONING HAZARD.

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

Do NOT operate furnace in a corrosive atmosphere containing chlorine, fluorine or any other damaging chemicals, which could shorten furnace life.

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

WARNING

Figure 1

*8″ (203.2mm) Min. 20′ (6.1m) Max. in same atmospheric zone

Vent Pipes MUST be supported Horizontally and Vertically

* Increase minimum from 8 (203.2mm) to 18 (457.2mm) for cold climates (sus tained temperatures 0F (-17C) and below for 24 or more consecutive hours).

Typical Upflow Installation

Aluminum or non-rusting shield recommended. (See Vent Termination Shielding for dimensions).

Coupling on ends of exhaust pipe. Total

Inlet Pipe (not used on Single Pipe model)

DISCHARGE AIR

pipe & coupling out side structure = 8″

(203.2mm)

*8″ (203.2mm) Min. 20′ (6.1m) Max. in same atmospheric zone

25−23−33

Figure 2 Typical Downflow Installation

Inlet Pipe (not used on Single Pipe model)

Vent Pipes MUST be supported Horizon tally and Vertically

See Vent Termination Shielding in Vent Section.

*8″ (203.2mm) Min. 20′ (6.1m) Max. in same atmospheric zone

Coupling on inside and outside of wall to restrain vent pipe

*8″ (203.2mm) Min. 20′ (6.1m) Max. in same atmospheric zone

8″ Min.

CAUTION

FROZEN AND BURST WATER PIPE HAZARD

FaiIure to follow this caution may result in property damage.

Special precautions MUST be made if installing furnace in an area which may drop below freezing. This can cause improper operation or damage to equipment. If furnace environment has the potential of freezing, the drain trap and drainline must be protected. The use of electric heat tape or RV antifreeze is recommended for these installations. (See “Condensate Trap Freeze

Protection Section”)

440 01 2024 04

* Increase minimum from 8 (203.2mm) to 18 (457.2mm) for cold climates (sus tained temperatures 0F (-17C) and below for 24 or more consecutive hours).

Specifications are subject to change without notice.

25−23−33a

Page 8

Installation Requirements

1. Install furnace level.

2. This furnace is NOT to be used for temporary heat of

buildings or structures under construction.

3. Install furnace as centralized as practical with respect to the

heat distribution system.

4. Install the vent pipes as short as practical, and in

accordance to these instructions. (See Vent and Combustion Air Piping section).

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

clearance of 24″ (609.6mm) required and 30″ (762mm) recommended for access to the burner, controls and filter. See clearance requirements in Figure 4.

6. Use a raised base for upflow furnace if the floor is damp or

wet at times.

7. For downflow installations, non combustible subbase must

be used under the furnace unless installation is on a non combustible floor surface. This requirement applies even when a coil box or cabinet is used.

8. For horizontal installations, line contact is permissible only

between lines formed by intersection of back and two sides of furnace jacket, and building joists, studs or framing.

9. Residential garage installations require:

• Burners and ignition sources installed at least 18″

(457.2mm) above the floor.

• Located or physically protected from possible damage by

a vehicle.

10. Local codes may require a drain pan under the entire

furnace and condensate trap when the furnace is installed in attic application.

This furnace may be used for construction heat provided that all the following conditions are met:

• The furnace is permanently installed with all electrical

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

• The furnace is controlled by a thermostat. It may not be “hot

wired” to provide heat continuously to the structure without thermostatic control.

• Clean outside air is provided for combustion. This is to

minimize the corrosive effects of adhesives, sealers and other construction materials. It also prevents the entrainment of drywall dust into combustion air, which can cause fouling and plugging of furnace components.

• The temperature of the return air to the furnace is

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

• The air temperature rise is within the rated rise range on the

furnace rating plate, and the firing rate has been set to the rating plate value.

• The filters used to clean the circulating air during the

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

• The furnace, ductwork and filters are cleaned as necessary

to remove drywall dust and construction debris from all HVAC system components after construction is completed.

• After construction is complete, verify furnace operating

conditions including ignition, input rate, temperature rise and venting according to these instructions.

WARNING

CARBON MONOXIDE POISONING HAZARD

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

Do NOT operate furnace in a corrosive atmosphere containing chlorine, fluorine or any other damaging chemicals, which could shorten furnace life.

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

Furnace Installation Considerations

The installation of the furnace for a given application will dictate the position of the furnace, the airflow, ductwork connections, vent and combustion air piping. Consideration must be given to the following:

Condensate Trap and Drain Lines

The supplied condensate trap must be attached to the furnace side panel on either the left or right side. For horizontal installations, the drain trap is vertically attached to the side panel below the furnace. A minimum clearance of 6″ (152.4mm) below the furnace is required for the condensate trap. Downward slope of the condensate drain line from the condensate trap to the drain location must be provided. Adequate freeze protection of the drain trap and the drain line must be provided. See “Condensate Drain Trap” section for further details.

Leveling

Proper leveling of the furnace must be provided to insure proper drainage of the condensate from the furnace. The furnace must be level to within for upflow and downflow installations or top to bottom for horizontal installations.

Vent and Combustion Air Connections

For venting information literature, call 931.270.4100 with the complete model and serial number of the furnace.

Special Venting Requirements for Installations in Canada

Installation in Canada must conform to the requirements of CSA B149 code. Vent systems must be composed of pipe, fittings, cements, and primers listed to ULC S636. The special vent fittings and accessory concentric vent termination kits and accessory external drain trap have been certified to ULC S636 for use with those Royal Pipe and IPEX PVC vent components which have been certified to this standard. In Canada, the primer and cement must be of the same manufacturer as the vent system – GVS-65 Primer (Purple) for Royal Pipe or IPEX System 636, PVC/CPVC Primer, Purple Violet for Flue Gas Venting and GVS-65 PVC Solvent Cement for Royal Pipe or IPEX System 636 Cement for Flue Gas Venting, rated Class IIA, 65 deg C. must be used with this venting system - do not mix primers and cements from one manufacturer with a vent system from a different manufacturer. Follow the manufacturer’s instructions in the use of primer and cement and never use primer or cement beyond its expiration date.

The safe operation, as defined by ULC S636, of the vent system is based on following these installation instructions, the vent system manufacturer’s installation instructions, and proper use of primer and cement. All fire stop and roof flashing used with this system must be UL listed material. Acceptability under Canadian standard CSA B149 is dependent upon full compliance with all installation instructions. Under this standard, it is recommended that the vent system be checked once a year by qualified service personnel.

The authority having jurisdiction (gas inspection authority, municipal building department, fire department, etc) should be consulted before installation to determine the need to obtain a permit.

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

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

t, PVC

(1)

Specifications are subject to change without notice.

440 01 2024 04

Page 9

Consignes spéciales pour l’installation de ventillation au Canada

L’installation faite au Canada doit se conformer aux exigences du code CSA B149. Ce systême de ventillation doit se composer de tuyaux, raccords, ciments et apprêts conformes au ULC S636. La tuyauterie de ventillation des gaz, ses accessoires, le terminal concentrique mural ainsi que l’ensemble du drain de condensat extérieur ont été certifiés ULCS 636 pour l’application des composantes Royal Pipe, IPEX PVC qui sont certifiées à ce standard. Au Canada, l’apprêt et le ciment doivent être du même fabricant que le système d’évacuation. L’apprêt GVS-65 (Purple) et le ciment-solvant GVS-65 doivent être utilisé avec les Royal Pipe. Système IPEX 636, apprêt PVC/CPVC, Purple pour évacuation des gaz de combustion et système IPEX 636(1)t, ciment PVC pour évacuation des gaz de combustion, coté classe IIA, 65 deg C. doivent être utilisés avec le système d’évacuation IPEX 636 – Ne pas combiner l’apprêt et le ciment d’un manufacturier avec un système d’évacuation d’un manufacturier différent.

Bien suivre les indications du manufacturier lors de l’utilisation de l’apprêt et du ciment et ne pas utiliser ceux-ci si la date d’expiration est atteinte.

L’opération sécuritaire, tel que définit par ULC S636, du système de ventilation est basé sur les instructions d’installation suivantes, ainsi que l’usage approprié de l’apprêt et ciment. Tout arrët feu et solin de toit utilisés avec ce système doivent être des matériaux listés UL. L’acceptation du standard Canadien CSA B419 est directement relié à l’installation conforme aux instructions ci- haut mentionnées. Le standard Canadien recommande l’inspection par un personel qualifié et ce, une fois par année.

Les autoritées ayant juridiction (inspecteurs de gas, inspecteurs en bâtiments, département des incendies, etc) devraient être consultées avant l’installation afin de déterminer si un permis est requis.

On the Dual Certified furnace, the vent and combustion air pipes attach to the furnace through the top panel for the upflow and horizontal installations. For the downflow installation, the vent and combustion air pipes attach to the furnace through the alternate locations on the furnace side panels.

Note: On the Direct Vent furnace, the vent pipe attaches to the furnace through the side panels. The combustion air pipe attaches to the top panel or to the alternate location on the side panel. On the Single Pipe furnace, the vent pipe attaches to the furnace through the furnace side panels.

Note: Repositioning of the combustion blower is required for the vent pipe connection to the furnace through the “right side” panel. See “Vent and Combustion Air Piping” section for further details.

Horizontal Furnace Installation

Figure 3

Vent Pipe

NOTE: 5″ (127mm) bottom clearance required for condensate trap.

This furnace can be installed horizontally in an attic, basement, crawl space, alcove, or suspended from a ceiling in a basement or utility room (See Figure 3). Do not install furnace on its back or in the reverse airflow positions as safety control operation will be adversely affected.

If the furnace is to be suspended from the floor joists in a crawl space or the rafters in an attic, it is necessary to use steel pipe straps or an angle iron frame to rigidly attach the furnace to prevent movement. These straps should be attached to the furnace bottom side with sheet metal screws and to the rafters or joists with bolts. The preferred method is to use an angle iron frame bolted to the rafters or joists.

If the furnace is to be installed in a crawl space, consult local codes. A suitable concrete pad or blocks are recommended for crawl space installation on the ground.

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

24″ (609.6mm) inches between the front of the furnace and adjacent construction or other appliances MUST be maintained for service clearance. [30″ (762mm) inches is required to remove furnace].

Keep all insulating materials clear from louvered door. Insulating materials may be combustible.

The horizontal furnaces may be installed directly on combustible wood flooring or supports as long as all required furnace clearances are met. See Figure 3.

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

For horizontal installation over a finished living space. A field fabricated auxiliary drain pan with drain pipe is required to prevent damage by overflow due to blocked condensate drain.

Typical Horizontal Installation

Inlet Pipe (not used on Single Pipe model)

Condensate Trap

25−23−34

440 01 2024 04

Specifications are subject to change without notice.

Page 10

Figure 4

Dimensions and Clearances

TRAP (KO) (COUNTERFLOW)

AIR INTAKE (KO) (ALTERNATE)

TRAP (KO) UPFLOW/HORIZONTAL

(57.2)

(336.6)

(47.6 )

Unit

Capacity

*9MPT050F12

*9MPT075F14

*9MPT100J16

*9MPT125L20

*9MPV050F12

*9MPV075F12

*9MPV100J20

*9MPV125L20

*9MVX040F12

*9MVX060F12

*9MVX080J20

*9MVX100L20

* Denotes Brand

AIR INTAKE

VENT

TOP

LEFT SIDE

GAS

611/

(177.5)

ELECTRICAL

11/

(318)

(27)

11/

VENT

413/

THERMOSTAT

(KO)

215/

(549.3)

(609.6)

(122.2)

(177.8)

47/

(123.8)

(34.9)

13/

283/

(730.3)

241/

(611.2)

175/

(439.7)

111/

(42.9)

Drawing is representative, but some models may vary

BOTTOM

231/

(587.4) (98.4)

37/

ALL DIMENSIONS: in (mm)

Cabinet Bottom Top

A B

191/

(485.8)

191/

(485.8)

223/

(577.9)

241/

(622.3)

191/

(485.8)

191/

(485.8)

223/

(577.9)

241/

(622.3)

191/

(485.8)

191/

(485.8)

223/

(577.9)

241/

(622.3)

175/

(477.7)

175/

(477.7)

211/

(539.8)

(584.2)

175/

(447.7)

175/

(447.7)

211/

(539.8)

(584.2)

175/

(447.7)

175/

(447.7)

211/

(539.8)

(584.2)

D E F G H

21/

(54)

21/

(54)

(49.2)

(11.1)

21/

(54)

21/

(54)

(49.2)

(11.1)

21/

(54)

21/

(54)

(49.2)

(11.1)

143/

(374.7)

143/

(374.7)

183/

(476.3)

(584.2)

143/

(374.7)

143/

(374.7)

183/

(476.3)

(584.2)

143/

(374.7)

143/

(374.7)

183/

(476.3)

(584.2)

115/

(758.8)

297/

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

43/

(111 .1)

3111/

(804.9)

1311/

(347.7)

1913/

(503.2)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

41/

(114.3)

MINIMUM CLEARANCES TO COMBUSTIBLE

A B

MATERIALS FOR ALL UNITS − in (mm)

REAR 0 FRONT (combustion air openings in

3″ (76.2)

furnace and in structure)

FRONT

Required For Service

ALL SIDES Of SUPPLY PLENUM 1″ (25.4)

*24″ (609.6)

SIDES 0 VENT 0 TOP OF FURNACE 1″ (25.4)

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

Horizontal position: Line contact is permissible only between

(30.2)

21/

(63.5)

21/

(63.5)

25/

(66.7)

21/

(57.2)

21/

(63.5)

21/

(63.5)

25/

(66.7)

21/

(57.2)

21/

(63.5)

21/

(63.5)

25/

(66.7)

21/

(57.2)

91/

(241.3)

91/

913/

(249.2)

(241.3)

113/

(288.9)

121/

(311.2)

91/

(241.3)

91/

(241.3)

113/

(288.9)

121/

(311.2)

91/

(241.3)

91/

(241.3)

113/

(288.9)

121/

(311.2)

lines formed by intersections of top and two sides of furnace jacket, and building joists, studs or framing.

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

Furnace is designed for bottom return or side return.

Return air through back of furnace is NOT allowed.

(31.7)

(73)

11/

GAS (KO)

297/

(758.8)

273/

(690.6)

215/

3311/

(855.7)

(549.3)

KO = KnockOut

(60.3 )

(27)

413/

(122.2)

11/

(27)

(439.7)

175/

111/

(42.9)

(109.5)

45/

(177.8)

(123.8)

281/

(723.9)

(469.9)

RIGHT SIDE

TRAP (KO) (COUNTERFLOW)

ELECTRICAL (KO)

AIR INTAKE (KO) (ALTERNATE)

VENT (KO) TRAP (KO) UPFLOW/HORIZONTAL

21/

(609.6)

215/

(549.3)

(57.2)

(336.6)

THERMOSTAT

131/

(KO)

(19.1)

TYPE

(1016)

17/

(47.6)

25−23−36b

Specifications are subject to change without notice.

440 01 2024 04

Page 11

Knock Outs

! CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate clothing, safety glasses and gloves when handling parts and servicing furnaces.

Use a hammer and screwdriver to strike a sharp blow (see Figure 5) directly to the knockout tie points or use a hammer in the upper left corner of the desired knockout. Remove any burrs and sharp edges.

CAUTION

Combustion & Ventilation Air

Figure 5

Hammer and Screwdriver Used for Knockout

25-40-06

NOTE: If a knockout does not come out after two sharp blows, pull and snip as needed to remove the knockout.

For Single Pipe Installation (Non−Direct Vent)

CARBON MONOXIDE POISONING HAZARD

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

Provide adequate combustion and ventilation air.

Use methods described here to provide combustion and ventilation air.

Furnaces require ventilation openings to provide sufficient air for proper combustion and ventilation of flue gases. All duct or openings for supplying combustion and ventilation air must comply with National Fuel Gas Code, NFPA54/ANSI Z223.1, 2009 (or current edition) and applicable provisions of local building codes.

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

uses tables and information from the ANSI Z223.1/NFPA

54. For use in Canada, use CSA B149.1 for this information.

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

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

3. Applicable provisions of the local building code.

This furnace can NOT be common vented or connected to any type B, BW or L vent or vent connector, nor to any portion of a factory−built or masonry chimney. Multistory venting is NOT permitted. If this furnace is replacing a previously common-vented furnace, it may be necessary to resize the existing vent and chimney to prevent oversizing problems for the other remaining appliance(s). See “Venting and Combustion Air Check” in this section. This furnace MUST be vented to the outside.

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

WARNING

Outdoor Combustion Air Method

A space having less than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW) input rating for all gas appliances installed in the space requires outdoor air for combustion and ventilation.

Air Openings and Connecting Ducts

1. Total input rating for all non direct vent gas appliances

MUST be considered when determining free area of openings.

2. Connect ducts or openings directly to outside.

3. When screens are used to cover openings, they MUST be

no less than

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

5. When sizing grille or louver, use the free area of opening. If free area is NOT stamped or marked on grill or louver, assume a 20% free area for wood and 60% for metal.

/4″ (6.4mm) mesh.

Confined Space Installation

NOTE: A confined space is defined as an area with less than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW) input rating for all gas appliances installed in the area.

Requirements

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

2. Figure 6 illustrate how to provide combustion and ventilation air. A minimum of two permanent openings, one inlet and one outlet, are required.

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

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

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

area per 2,000 BTUH (11 cm2/kW) of combined input for all gas appliances in the space (see Table 1).

d. Vertical duct openings or openings directly

communicating with the outdoors require 1 square inch of free area per 4,000 BTUH (5.5 cm2/kW) for combined input of all gas appliances in the space (see Table 1).

440 01 2024 04

Specifications are subject to change without notice.

Page 12

Figure 6

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

This installation NOT approved in Canada

Gable Vent

Gas Vent

Ventilated Attic

Top Above Insulation

Outlet Air (1)

Ventilated Crawl Space

Alternate Inlet Air (1)

Soffit Vent

Inlet Air (1)

Gas Vent

Ventilated Attic

Top Above Insulation

OutletAir (1)

3. One opening MUST be within 12″ (304.8mm) of the floor

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

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

/kW) for

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

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

in the space.

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

4. Size openings and ducts per Table 1. a. Indoor openings that comply with the Indoor

Combustion Air Method below and

b. Outdoor openings located as required in the Outdoor

Combustion Air Method above and

Gas Vent

Gable Vent

Soffit Vent

Inlet Air (2)

Outlet Air (1)

Inlet Air (1)

Minimum One Inlet and One Outlet Air Supply is Required May be in any Combination Shown

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

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

(1) 1 Square Inch per 4000 BTUH

(2) 1 Square Inch per 2000 BTUH

Inlet Air (2)

Outlet Air (2)

c. Outdoor openings sized as follows.

1) Calculate the Ratio of all Indoor Space volume divided by required volume for Indoor Combustion Air Method.

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

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

5. Horizontal duct openings require 1 square inch of free area per 2,000 BTUH of combined input for all gas appliances in area (see Table 1).

6. Vertical duct openings or openings directly to outside require 1 square inch of free area per 4,000 BTUH (5.5

/kW) for combined input of all gas appliances in area

cm (see Table 1).

Table 1

BTUH (kW)

Input Rating

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

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

60,000 (17.58) 30 sq. in. (194 cm2) 20 sq. in. (129 cm2) 15 sq. in. (97 cm2) 5″ (127mm)

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

80,000 (23.45) 40 sq. in. (258 cm2) 26.7 sq. in. (172 cm2) 20 sq. in. (129 cm2) 5″ (127mm)

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

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

EXAMPLE: Determining Free Area

Furnace 100,000

29.31 Furnace 100,000

29.31

Free Area

Two Horizontal Ducts

BTUH (kW)

sq. in./2,000(1 cm2/.09)

Water Heater

30,000

8.8

Water Heater

30,000

8.8

Minimum Free Area Required for Each Opening or Duct to Outdoors

Single Opening

BTUH (kW)

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

Total Input

(130,000 ÷ 4,000)

(38.11 ÷ .18)

Total Input

(130,000 ÷ 2,000)

(38.11 ÷ .09)

Specifications are subject to change without notice.

Two Vertical Ducts or Openings

= 32.5 Sq. In. Vertical = 210 cm2 Vertical

= 65 Sq. In. Horizontal = 423 cm2 Horizontal

BTUH (kW)

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

Round Duct

BTUH (kW)

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

440 01 2024 04

Page 13

Indoor Combustion Air (Unconfined Space)

Standard and Known-Air-Infiltration Rate Methods

 NFPA & AGA

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

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

injury or death. Most homes will require additional air from

outdoors for combustion and ventilation. A space with at least 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW) input rating or homes with tight construction may need outdoor air, supplied through ducts, to supplement air infiltration for proper combustion and ventilation of flue gases.

The Standard Method may be used, if the space has no less volume than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW) of the maximum input ratings for all gas appliances installed in the space. The standard method permits indoor air to be used for combustion and ventilation air.

The Known Air Infiltration Rate Method shall be used if the infiltration rate is known to be less than 0.40 air changes per hour

Table 2

ACH

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

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

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

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

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

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

0.00 NP NP NP NP NP NP NP

ACH = Air Changes per Hour NP = Not Permitted

Table 2 Minimum Space Volumes were determined by using the following equations from the National Fuel Gas Code ANSI Z223.1/NFPA 54−2009, 9.3.2.2:

1. For appliances other than fan−assisted appliances (such as a draft hood−equipped water heater), calculate using the following equation:

Required Vol ume

WARNING

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

Other Than Fan-Assisted Total Fan-assisted Total

30,000 BTU

(8,790 kW)

other



21 ft

ACH

59 m

ACH

40,000 BTU (11,720 kW)

(

other

1000 BTUH

other

.293 kW

50,000 BTU (14,650 kW)

)

(ACH) and equal to or greater than 0.10 ACH. Infiltration rates greater than 0.60 ACH shall not be used. The minimum required volume of the space varies with the number of ACH and shall be determined per Table 2 or Equations 1 and 2. Determine the minimum required volume for each appliance in the space, and add the volumes together to get the total minimum required volume for the space.

WARNING

CARBON MONOXIDE POISONING HAZARD

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

An unconfined space or homes with tight construction may not have adequate air infiltration for proper combustion and ventilation of flue gases.

Most homes will require additional air.

The Known Air Infiltration Rate Method shall be used if the infiltration rate is known to be less than 0.40 air changes per hour (ACH) and equal to or greater than 0.10 ACH. Infiltration rates greater than 0.60 ACH shall not be used. The minimum required volume of the space varies with the number of ACH and shall be determined per Table 2 or Equations 1 and 2. Determine the minimum required volume for each appliance in the space, and add the volumes together to get the total minimum required volume for the space.

50,000 BTU (14,650 kW)

)

2. For fan−assisted appliances (such as this furnace), calculate using the following equation:

Required Vol ume

where:

= all appliances other than fan−assisted input in BTUH

other

= fan−assisted appliance input in BTUH

fan

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

exchanged per hour, expressed as a decimal)

75,000

(21,975 kW)

fan



100,000 BTU

(29,300 kW)

15 ft

ACH

.42 m

ACH

( (

1000 BTUH

.293 kW

125,000 BTU

(36,625 kW)

fan

) )

440 01 2024 04

Specifications are subject to change without notice.

Page 14

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

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

are no closable doors between rooms.

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

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

• Combining spaces on the same floor level. Each opening

shall have a free area of at least 1 in

/kW) of the total input rating of all gas appliances in the

(22cm space, but not less than 100 in commence within 12″ (304.8 mm) of the top and one opening shall commence within 12″ (304.8mm) of the bottom of the enclosure. The minimum dimension of air openings shall be at least 3″ (76.2 mm).

(645 cm2). One opening shall

/kW) of total input

/1,000 BTUH

• Combining spaces on different floor levels. The volumes of

spaces on different floor levels shall be considered communicating spaces if connected by one or more permanent openings in doors or floors having a free area of at least 2 in2/1,000 Btuh (44 cm2/kW) of total input rating of all gas appliances.

• In spaces that use the Indoor Combustion Air Method,

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

• Unusually tight construction is defined as Construction with

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

2. Doors and openable windows are weather stripped and

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

Ventilation Air

Some provincial codes and local municipalities require ventilation or make−up air be brought into the conditioned space as replacement air. Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60° so that flue gases will not condense excessively in the heat exchanger. Excessive condensation will shorten the life of the heat exchanger and possibly void your warranty.

Venting and Combustion Air Check

NOTE: If this installation replaces an existing furnace from a commonly vented system, the original venting system may no longer be sized to properly vent the attached appliances. An improperly sized venting system may cause the formation of condensate in the vent and the leakage or spillage of vent gases. To make sure there is adequate combustion air for all appliances,

MAKE THE FOLLOWING CHECK.

Figure 7

Vent Pipe

Typical Gas Water Heater

If flame pulls towards draft hood, this indicates sufficient venting.

The following information is supplied to allow the installer to make adjustments to the setup of existing appliances, IF REQUIRED, based on good trade practices, local codes, and good judgement of the installer. Manufacturer does NOT take responsibility for modifications made to existing equipment.

CARBON MONOXIDE POISONING HAZARD

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

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

1. Seal any unused openings in the venting system.

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

Z223.1/NFPA 54 or CSA B149.1, Natural Gas and Propane Installation Code and these instructions. 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. (Figure 7)

8. If improper venting is observed, during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI

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

9. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas−fired burning appliance to their previous conditions of use.

Vent Check

Draft Hood

Match

WARNING

Specifications are subject to change without notice.

440 01 2024 04

Page 15

For Two Pipe Installation (Direct Vent)

This furnace can NOT be common vented or connected to any type B, BW or L vent or vent connector, nor to any portion of a

Vent and Combustion Air Piping

factory−built or masonry chimney. If this furnace is replacing a previously common-vented furnace, it may be necessary to resize the existing vent and chimney to prevent oversizing problems for the other remaining appliance(s). See “Venting and Combustion Air Check” in this section. This furnace MUST be vented to the outside.

WARNING

CARBON MONOXIDE POISONING HAZARD

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

Use methods described here to provide combustion and ventilation air.

Dual Certified (*9MPT, *9MPV, *9MVX Models) Direct or Non-Direct Vent

This furnace is certified as a Category IV furnace. This furnace can be installed as a direct vent furnace using outside air for combustion or the furnace can use air from inside the structure for combustion. The INLET air pipe is optional. If combustion air comes from inside the structure, adequate make up air MUST be provided to compensate for oxygen burned. See Confined Space Installation in the Combustion and Ventilation Air chapter. If combustion air is drawn from outside the structure, it MUST be taken from the same atmospheric pressure zone as the vent pipe.

Contaminated Combustion Air

Installations in certain areas or types of structures will increase the exposure to chemicals or halogens that may harm the furnace.

The following areas or types of structures may contain or have exposure to the substances listed below. The installation must be evaluated carefully as it may be necessary to provide outside air for combustion.

• Commercial buildings.

• Buildings with indoor pools.

• Furnaces installed in laundry rooms.

• Furnaces installed in hobby or craft rooms.

• Furnaces installed near chemical storage areas.

• Permanent wave solutions for hair.

• Chlorinated waxes and cleaners.

• Chlorine based swimming pool chemicals.

• Water softening chemicals.

• De−icing salts or chemicals.

• Carbon tetrachloride.

• Halogen type refrigerants.

• Cleaning solvents (such as perchloroethylene).

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid.

• Sulfuric Acid.

• Solvent cements and glues.

• Antistatic fabric softeners for clothes dryers.

• Masonry acid washing materials.

440 01 2024 04

Specifications are subject to change without notice.

Vent and Combustion Air Piping Guidelines

This furnace is approved for venting with Schedule 40 PVC, CPVC, ABS fittings, and Cellular Core and SDR−26 PVC pipe.

Applicable ASTM Standards for Vent Materials

Materials

ABS D1527 __ F628

PVC D1785 D2241 F891

CPVC F441 F442 −− F438 −− F493

ABS to

PVC

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

conform to applicable CSA standards or to local codes having jurisdiction.

with the specific venting material.

solvent cement that meets the requirements of ASTM D3138.

use for cementing plastic pipe and fittings.

NOTE: In order to create a seal that allows future removal of pipe, RTV sealant MUST be used on the inlet pipe where it joins to the

furnace. NOTE: All vent piping MUST be installed in compliance with local codes or ordinances, these instructions, good trade practices, and codes of country having jurisdiction.

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

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

3. Loosely assemble all venting parts without adhesive (pipe

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

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

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

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

8. All exhaust vent piping from the furnace to termination

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

Sch. 40

Pipe

−− −− −− −− −− D3138

2) Only use solvent cements that are marked for use

3) ABS to PVC transition joints REQUIRE a special

4) Refer to ASTM D2855 for general procedure to

and air inlet pipe by referring to all of the instructions and guidelines in this Section.

pipe.

joint cement) for correct fit before final assembly.

of condensate.

some moisture in the flue gases that may condense as it leaves the vent pipe (See Instructions For Horizontal Vents).

is allowed to rest on the combustion blower.

be reduced.

MUST slope upwards. A minimum of (304.8mm) of run is required to properly return condensate to the furnace drain system.

they provide for the minimum slope on horizontal runs and they provide less resistance in the vent system. If DWV elbows cannot be used, use two, 45° elbows when possible. On horizontal runs the elbows can be slightly misaligned to provide the correct slope.

SDR Pipe

Cell

Core

Pipe

Fittings Primer

D2468

D2661

D2466

D2665

−− D2235

F656 D2564

/4″ (6.4mm) per foot

Solv.

Cement

Page 16

10. All horizontal pipe runs MUST be supported at least

every five feet with galvanized strap or other rust resistant material. NO sags or dips are permitted.

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

(1.8m) where accessible.

12. The maximum pipe length is 40′ (12.2m) total in the inlet or outlet side of the system. Up to five, 90° elbows can be used on the inlet or the outlet. With the Concentric Vent Termination Kits (NAHA001CV or NAHA002CV), the maximum pipe length is 35′ (10.7m) with four 90° elbows. If more elbows are required, reduce the length of both the inlet and exhaust pipes 5′ (1.5m) for each additional elbow used. (See Table 3 or Table 4).

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

14. The piping can be run in the same chase or adjacent to supply or vent pipe for water supply or waste plumbing. It can also be run in the same chase with a vent from another 90+ furnace.

NOTE: In NO case can the piping be run in a chase where temperatures can exceed 140° F (60° C). or where radiated heat from adjacent surfaces would exceed 140° F(60° C).

15. The vent outlet MUST be installed to terminate in the same atmospheric pressure zone as the combustion air inlet.

16. The vent system can be installed in an existing unused chimney provided that:

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

chimney.

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

vented into the chimney.

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

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

• The termination clearances shown in Figure 8 are

maintained.

17. Furnace applications with vertical vents requiring vent diameter increaser fittings must have increaser fittings installed in vertical portion of the vent. Condensate will be trapped in the vent if the vent diameter is increased prior to having an elbow turned upward. This could cause nuisance tripping of the pressure switch.

Combustion Air and Vent Piping Insulation Guidelines

NOTE: Use closed cell, neoprene insulation or equivalent. If Fiberglass or equivalent insulation is used it must have a vapor barrier. Use R values of 7 up to 10′ (3.1m), R−11 if exposure exceeds 10′ (3.1m). If Fiberglass insulation is used, exterior to the structure, the pipe MUST be boxed in and sealed against moisture.

1. When the vent or combustion air pipe height above the roof exceeds 30″ (76.2mm), or if an exterior vertical riser is used on a horizontal vent to get above snow levels, the exterior portion MUST be insulated.

2. When combustion air inlet piping is installed above a suspended ceiling, the pipe MUST be insulated with moisture resistant insulation such as Armaflex or other equivalent type of insulation.

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

Sizing Combustion Air and Vent Pipe

Consult Table 3 or Table 4 to select the proper diameter exhaust and combustion air piping. Exhaust and combustion air piping is sized for each furnace Btuh size based on total lineal vent length (on inlet or outlet side), and number of 90° elbows required.

1. Double Pipe Installation−If installing as a direct−vent appliance, consult Table 4 to select the proper diameter exhaust and combustion air piping. Exhaust and combustion air piping is sized for each furnace Btuh size based on total lineal vent length (on inlet or outlet side), and number of 90° elbows required.

2. Single Pipe Installation−If installing as a non−direct vent appliance, (single outlet pipe and no inlet pipe) refer to Table 3. The table shows the maximum number of elbows allowed with any given pipe diameter and length of run.

3. Use of Elbows−Two 45° elbows can be substituted for one

90° elbow. The elbow or elbows used for vent termination outside the structure ARE counted, including elbows needed to bring termination above expected snow levels.

Table 3

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

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

80,000 & 100,000 Btuh Furnace

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

The minimum vent length is 5 (1.5m) of PVC. Elbows are DWV Long Radius Type for 2 vents.

If more than five elbows are required, reduce the length of both the inlet and exhaust pipes 5′ (1.5m) for each additional elbow used. If less than five elbow are required, the length can be INCREASED by 5′ (1.5m) for each additional elbow NOT used. NOTE: It is allowable to use larger diameter pipe and fitting than shown in the tables but not smaller diameters than shown.

Table 4

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

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

80,000 & 100,000 Btuh Furnace

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

The minimum vent length is 5 (1.5m) of PVC. Elbows are DWV Long Radius Type for 2 vents.

If more than five elbows are required, reduce the length of both the inlet and exhaust pipes 5′ (1.5m) for each additional elbow used. If less than five elbow are required, the length can be INCREASED by 5′ (1.5m) for each additional elbow NOT used. * Feet (meters) of pipe is whichever pipe run is the longest, either inlet or outlet side. For concentric vent pipe diameter see Concentric Termination tables in this manual.

Pipe Diameter Table

Single Piping ONLY

125,000 Btuh Furnace

″ (50.8mm) and 3″ (76.2mm)

Pipe Diameter Table

Dual Piping ONLY

125,000 Btuh Furnace

″ (50.8mm) and 3″ (76.2mm)

Vent Termination Clearances

CARBON MONOXIDE POISONING HAZARD

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

Inlet and outlet pipes may NOT be vented directly above each other.

1. Determine termination locations based on clearances

specified in following steps and as shown in Figure 8,

Figure 9, Figure 22, through Figure 30. For concentric vent termination clearances, refer to Concentric Termination Kit instructions.

2. This furnace is Dual Certified and can be installed as a single pipe appliance (all combustion from inside the structure) or as a direct vent appliance where all combustion air is taken from outside the structure.

3. For Single Pipe installation refer to Figure 9 for vent termination clearances.

4. For Direct Vent installation, refer to Figure 8 for vent termination.

WARNING

Specifications are subject to change without notice.

440 01 2024 04

Page 17

Figure 8 Direct Vent Termination Clearance

Item Clearance Description Canadian Installation (1)

A Clearance above grade, veranda, porch, deck, balcony, or

anticipated snow level

B Clearance to a window or door that may be opened 12″ (30 cm) for appliances u 10,000 Btuh (3 kW) and v

C Clearance to a permanently closed window

D Vertical clearance to a ventilated soffit located above the

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

E Clearance to an unventilated soffit

F Clearance to an outside corner

G Clearance to an inside corner

H Clearance to each side of the centerline extended above

electrical meter or gas service regulator assembly

I Clearance to service regulator vent outlet 3′ (91 cm)

J Clearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

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

L Clearance under a veranda, porch, deck, or balcony 12″ (30 cm) +

M 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.

N Clearance to the vent terminal of a dryer vent, water heater

vent, or other appliances direct vent intake or exhaust.

O Clearance from a plumbing vent stack 3′ (91 cm) 3′ (91 cm)

P Clearance above a paved sidewalk or paved driveway lo

cated on public property.

u greater than, w greater than or equal to, t less than, v less than or equal to (1.) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code (2.) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code # 18″ (46 cm) above roof surface + Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

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

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

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

Notes:

1. The vent for this appliance shall not terminate a. Over public walkways; or b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or c. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.

2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustion products of adjacent vents. Recirculation can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.

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

12″ (30cm) # 12″ (30 cm)

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

9″ (23 cm) for appliances u 10,000 Btuh (3 kW) and v 50,000 Btuh (14.7 kW), 12″ (30 cm) for appliances u 50,000 Btuh (14.7 kW)

* * * *

* * * * * *

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

12″ (30 cm) for appliances u 10,000 Btuh (3 kW) and v 100,000 Btuh (30 kW), 36″ (91 cm) for appliances u 100,000 Btuh (30 kW)

9″ (23 cm) for appliances u 10,000 Btuh (3 kW) and v 50,000 Btuh (15 kW), 12″ (30 cm) for appliances u 50,000 Btuh (14.7 kW)

12″ (30 cm) 12″ (30 cm)

3′ (91 cm) 3′ (91 cm)

7′ (2.13 m) **

U.S. Installation (2)

440 01 2024 04

Specifications are subject to change without notice.

Page 18

Figure 9 Other than Direct Vent Termination Clearance

Item Clearance Descriptions Canadian Installation (1)

A Clearance above grade, veranda, porch, deck, balcony, or

anticipated snow level

B Clearance to a window or door that may be opened 12″ (30 cm) for appliances u 10,000 Btuh (3 kW) and v

C Clearance to a permanently closed window

D Vertical clearance to a ventilated soffit located above the

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

E Clearance to an unventilated soffit

F Clearance to an outside corner

G Clearance to an inside corner

H Clearance to each side of the centerline extended above

electrical meter or gas service regulator assembly

I Clearance to service regulator vent outlet 3′ (91 cm)

J Clearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

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

L Clearance under a veranda, porch, deck, or balcony 12″ (30 cm)+

M 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.

N Clearance to the vent terminal of a dryer vent, water heater

vent, or other appliances direct vent intake or exhaust.

O Clearance from a plumbing vent stack

P Clearance above a paved sidewalk or paved driveway lo

cated on public property.

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

instructions.

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

Notes:

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

12″ (30cm) # 12″ (30 cm)

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

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

* * * *

* * * * * *

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

12″ (30 cm) for appliances u 10,000 Btuh (3 kW) and v 100,000 Btuh (30 kW), 36″ (91 cm) for appliances u 100,000 Btuh (30 kW)

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

* *

7′ (2.13 m) **

7′ (2.13 m)

U.S. Installation (2)

Specifications are subject to change without notice.

440 01 2024 04

Page 19

Condensate Drain Trap

This furnace removes both sensible and latent heat from the products of combustion. Removal of the latent heat results in condensation of the water vapor. The condensate is removed from the furnace through the drains in the plastic transition and the vent fitting. The drains connect to the factory installed internally mounted condensate drain trap on the left or right side of the furnace.

The startup of a new furnace will involve a cycle or two of the furnace to properly prime the condensate trap with water. Until the trap is fully primed, some condensate will be pulled into the combustion blower. The furnace may cycle on the pressure switch connected to the plastic transition box due to condensate buildup. After the trap is primed, the condensate will start draining from the furnace. The combustion blower will clear out any remaining condensate in the blower housing through the vent fitting downstream of the blower. Note that the condensate trap can also be primed by pouring water into the Remove the1/2″ (12.7mm) ID drain hose from either the gutter or the white PVC tee trap. Using a funnel pour eight (8) ounces (257 mL) of water into

/2″ (12.7mm) ID drain hose. Water will flow through the drain hose and into the condensate drain trap. This will prime both the vent and the transition sides of the trap. Reconnect

the

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

the gutter or the PVC tee trap. The condensate drain trap supplied with the furnace MUST be

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

for

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

(12.7mm) CPVC [nominal

/8″ (15.9mm) O.D.] or vinyl tubing with a minimum inner diameter (I.D.) of 5/8″ (15.9mm) may also be used, as allowed by local codes. Alternate drain pipes and hoses may be used as allowed by local codes.

The drain line must maintain a downward slope toward the drain. is recommended. Installation of an overflow line is recommended when the

/4″ (6.4mm) per foot (304.8mm) slope to the condensate drain cannot be maintained. A drain tube clip is included in the furnace to prevent kinking/buckling of the drain tube. The clip should remain in the furnace (between the door switch plate and the blower shelf, Figure 10) during operation. See Figure 20 for proper routing and installation of the overflow.

Figure 10 Drain Tube Clip Location

/2″ (12.7mm) drain hose.

/4″ (6.4mm) per foot (304.8mm)

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.

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

local codes, or if no indoor floor drain is available. The condensate pump must be approved for use with acidic condensate.

2. A plugged condensate drain line or a failed condensate

pump will allow condensate to spill. If the furnace is installed where a condensate spill could cause damage, it is recommended that an auxiliary safety switch be installed to prevent operation of the equipment in the event of pump failure or plugged drain line. If used, an auxiliary safety switch should be installed in the R circuit (low voltage) ONLY.

3. If the auxiliary switch in the condensate pump is used, the furnace may shut down due to a blocked condensate line or failed pump. To prevent frozen water pipes see the “Frozen Water Pipe Hazard” section of this manual.

CAUTION

PROPERTY 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.

Condensate Drain Trap Freeze Protection

Special precautions MUST be made if installing furnace in an area which may drop below freezing. This can cause improper operation or damage to the equipment. If the the furnace environment has the potential of freezing, the drain trap and drain line must be protected. Use 3 to 6 watt per foot at 115 volt, 40° F (4°C) self−regulating shielded and waterproof heat tape. Wrap the drain trap and drain line with the heat tape and secure with the ties. Follow the heat tape manufacturer’s recommendations. Prime the trap before furnace operation.

Drain Tube

Blower Shelf

Representative drawing only, some models may vary in appearance.

Clip

Door Switch

440 01 2024 04

Specifications are subject to change without notice.

Page 20

Figure 11

Upflow Installations Top Vent

Vent Drain & Clamps

Dual Pressure Switch Detail

FLOW

AIR

Casing Grommet Black Rubber

/8 (15.9mm) ID

(Loose parts bag)

Plastic Caps (2) Yellow or black

Coupling & Clamps (Optional)

Drain Tee

Drain Tube Black Rubber

/2 (12.7mm) ID &

Clamps

Drain Connector Black PVC

/4 (18.1mm) PVC X 1/2 (12.7mm) CPVC (Loose parts bag)

Drain Tube Corrugated

/8 (15.9mm) ID &

Clamps

EXHAUST

INLET

OFF

On Some Models ONLY

Single Pressure Switch

Relief Tube Black Rubber 3/16 (4.8mm) ID

Street Elbow

/2 (12.7mm) CPVC

(Loose parts bag)

Drain Line Vent Tee 3/4 (18.1mm) PVC or 1/2 (12.7mm) CPVC (Field supplied)

Representative drawing only, some models may vary in appearance.

Drain Tube Black Rubber 5/8 (15.9mm) ID & Clamps, Cut length to fit (Loose parts bag)

25−24−67

Upflow Installations Top Vent (See Figure 11)

Remove knockout from the side of the furnace casing where drain tube will exit.

Install casing grommet [black rubber 5/8″ (15.9mm) ID grommet − in loose parts bag].

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

Install the black PVC tube connector [

/4″ (18.1mm) PVC x 1/2″ (12.7mm) CPVC from loose parts bag] as shown in the illustration above.

Cut the black drain tube [5/8″ (15.9mm) ID − in loose parts bag] to length to fit between trap and tube connector through grommet.

Clamp both ends of the drain tube using clamps provided.

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

Glue the CPVC street elbow to the trap using appropriate cleaner and solvent cement.

The field supplied

/4″ (18.1mm) PVC or 1/2″ (12.7mm) CPVC

drain line vent tee must vent outside the furnace cabinet (see exploded view above).

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Trap must be primed before operation. Verify all condensate drain connections are securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

Specifications are subject to change without notice.

440 01 2024 04

Page 21

Figure 12

Vent Drain & Clamps

Upflow Installations Vent through Left Side

Dual Pressure Switch Detail

FLOW

AIR

Drain Connector Black PVC

/4 (19.1mm) PVC X 1/2 (12.7mm) CPVC (Loose parts bag)

Plastic Cap Yellow or black

Coupling & Clamps (Optional)

Either: The PVC Drain Tee or a field supplied 2 (50.8mm) PVC Tee

Drain Tube Black Rubber

/2 (12.7mm) ID

& Clamps

EXHAUST

Tee Trap White PVC (loose parts bag)

Drain Tube Corrugated

/8 (15.9mm) ID

& Clamps

2 (50.8mm) PVC Coupling

INLET

On Some Models ONLY

OFF

Single Pressure Switch

Relief Tube Black Rubber 3/16 (4.8mm) ID

SIDE VIEW

Rotate downward 5 to 10

Casing Grommet Black Rubber

/8 (15.9mm) ID

(Loose parts bag)

Drain Line Vent Tee 3/4 (18.1mm) PVC or 1/2 (12.7mm) CPVC (Field supplied)

Representative drawing only, some models may vary in appearance.

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

Remove drain tee from inducer discharge and remove black drain

tube

/2″ (12.7mm) ID from bottom of drain tee. (*9MPT, *9MPV or

*9MVX models only)

Install Vent Pipe grommet in side of casing.

Cut an appropriate length of 2″ (50.8mm) PVC pipe long enough to exit the cabinet and connect the vent drain to either:

• A 2″ (50.8mm) PVC coupling fastened onto the drain tee (*9MPT, *9MPV or *9MVX models)

Install tee trap into bottom of tee.

Remove knockout from the side of the furnace casing where drain tube will exit.

Install the

Install the black PVC drain connector [

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

/4″ (19.1mm) PVC x 1/2″

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

Cut the black drain tube [ length to fit between trap and tube connector through grommet.

Clamp both ends of the drain tube using clamps provided.

Glue the CPVC street elbow to the trap using appropriate cleaner and solvent cement.

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the internal trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

NOTE: Built-in channel will be angled 5° to 10° also.

25−24−67a

/8″ (15.9mm) ID − in loose parts bag] to

440 01 2024 04

Specifications are subject to change without notice.

Page 22

Figure 13

Vent Drain & Clamps

All Models Vent through Right−Side

Plastic Cap Yellow or black

INLET

Dual Pressure Switch

OFF

On Some Models ONLY

2 (50.8mm) PVC Coupling

Relief Tube Black Rubber

/16 4.8mm) ID

Either: The PVC Drain Tee or a field supplied 2 (50.8mm) PVC Tee

Single Pressure Switch Details

Drain Tube Corrugated

/8 (15.9mm) ID &

AIR FLOW

Clamps

SIDE VIEW

Rotate downward 5 to 10

NOTE: Built-in channel will

be angled 5° to 10° also.

All Models Vent through Right−Side (See Figure 13)

Disconnect the black drain tube between the drain vent and the trap.

Rotate the inducer 180° for a right side vent after loosening the four (4) inducer attachment screws. Reinstall and retighten the inducer screws to 20″ pounds torque.

Using the 1/2″ (12.7mm) OD barbed coupling in the loose parts bag connect together with the two short and connect the lower discharge port of the vent drain to the trap. Secure all connections with clamps.

Install the vent pipe grommet into the casing

Cut an appropriate length of 2″ (50.8mm) PVC pipe long enough to exit the cabinet and connect the vent drain to either:

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

Install tee trap into bottom section of tee.

Remove knockout from the side of the furnace casing where drain tube will exit.

Install casing grommet black rubber [

− in loose parts bag]

/2″ (12.7mm) ID elbow tubes

/8″ (15.9mm) ID grommet

EXHAUST

Tee Trap White PVC (loose parts bag)

Elbow Tubes (2) Black Rubber

/2 (12.7mm) ID & Clamps

(loose parts bag)

Barbed Coupling, 1/2 (12.7mm) OD (loose parts bag)

Drain Line Vent Tee 3/4 (18.1mm) PVC or 1/2 (12.7mm) CPVC (Field sup plied)

Drain Connector Black PVC

/4 (19.1mm) PVC X 1/2 (12.7mm) CPVC (Loose parts bag)

Casing Grommet Black Rubber 5/8 (15.9mm) CPVC (Loose parts bag)

25−24−68

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

Install the black PVC tube connector [3/4″ (19.1mm) PVC x 1/2″ (12.7mm) CPVC from loose parts bag] as shown in the illustration above.

Cut the black drain tube [5/8″ (15.9mm) ID − in loose parts bag] to length to fit between trap and tube connector through grommet.

Clamp both ends of the drain tube using clamps provided.

Glue the CPVC street elbow to the trap using appropriate cleaner and solvent cement.

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the internal trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

Specifications are subject to change without notice.

440 01 2024 04

Page 23

Figure 14

Downflow Left−Side Vent and Trap

Plastic Cap Yellow or black

Coupling & Clamps (Optional)

Vent Drain & Clamps

Single Pressure Switch Detail

Either: The PVC Drain Tee or a field supplied 2 (50.8mm) PVC Tee

FLOW

AIR

Tee Trap White PVC (loose parts bag)

Elbow Tube Black Rubber 1/2 (12.7mm) ID & Clamps (Loose Parts Bag)

Drain Tube Black, 5/8 (15.9mm) ID Corrugated Cut at straight section

EXHAUST

Alternate INLET*

WARNING Move Caps to top of trap

2 (50.8mm) PVC Coupling

Drain Tube Black Rubber 1/2 (12.7mm) ID & Clamps

Dual Pressure Switch

FLOW

AIR

SIDE VIEW

Rotate downward 5 to 10

NOTE: Built-in channel will

be angled 5° to 10° also.

Relief Tube Black Rub ber 3/16 (4.8mm) ID

On Some Models ONLY

INLET

Flexible Tubing Connector, 3/16 (4.8mm) OD (loose parts bag)

Relief Tube, Extension Black Rubber, 3/16 (4.8mm) ID Cut to

OFF

fit (loose parts bag)

Trap Connection

“Clamp ears” Pointed OUT

Barbed Coupling 1/2 (12.7mm)

Leave room for clamp

Cut Here

Representative drawing only, some models may vary in appearance.

OD (loose parts bag)

Downflow Left−Side Vent and Trap (See Figure 14)

Remove the inducer mounting screws, rotate the inducer 180° and retighten the inducer screws to 20″ pounds torque.

Move the caps to the top of the trap and mount the trap externally to the left side of the unit using the two(2) screws provided.

Cut the fasten the 90° bend end to the trap and fasten the straight end to the transition drain. Secure both connections with clamps.

Reconnect the 1/2″ (12.7mm) ID drain hose from the vent drain to the trap and secure with a clamp. In some cases, additional length will be required for this hose. Use the Black plastic 1/2″ (12.7mm) OD barbed coupling and a suitable section of hose to make the connection. Secure all connections with clamps

Connect the trap to the top port of the transition as shown in the picture. In some

/8″ (15.9mm) ID corrugated hose as shown above and

/2″ (12.7mm) ID

/16″ (4.8mm) ID relief tube from the small port on the

Preassemble & insert into furnace

cases, additional hose length will be needed. Use the clear plastic

/16″ (4.8mm) OD flexible tubing connector and a suitable length

25−24−69

of extra 3/16″ (4.8mm) ID hose to make this connection.

Install the vent pipe grommet into the casing

Cut an appropriate length of 2″ (50.8mm) PVC pipe long , enough to exit the cabinet and connect the vent drain to either:

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

Install tee trap into bottom section of tee and glue pipe.

Remove knockout from the side of the furnace casing where drain tube will exit.

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

440 01 2024 04

Specifications are subject to change without notice.

Page 24

Figure 15

Downflow Right−Side Vent and Trap

Plastic Cap Yellow or black

Vent Drain & Clamps

SIDE VIEW

Rotate downward 5 to 10

NOTE: Built-in channel will

be angled 5° to 10° also.

Single Pressure Switch Detail

AIR

FLOW

Elbow Tube Black Rubber

/2 (12.7mm) ID & Clamps

(Loose Parts Bag)

Dual Pressure Switch

Drain Tube Corrugated Black,

/8 (15.9mm) ID & Clamps

Barbed Coupling

/2 (12.7mm) OD

(Loose Parts Bag)

Relief Tube Black Rubber

/16 (4.8mm) ID

Drain Hose Black Rubber

/2 (12.7mm) ID

Trap Connection

Preassemble & insert into furnace

“Clamp ears” Pointed OUT

Coupling & Clamps (Optional)

Cut to Fit & Clamps

On Some Models ONLY

2 (50.8mm) PVC Coupling

INLET

Either: The PVC Drain Tee or a field

AIR FLOW

supplied 2 (50.8mm) PVC Tee

Tee Trap White PVC (loose parts bag)

OFF

Drain Connector Black PVC 3/4 (19.1mm) PVC X 1/2 (12.7mm) CPVC (Loose parts bag)

WARNING Move Caps to top of trap

Representative drawing only, some models may vary in appearance.

Downflow Right−Side Vent and Trap (See Figure 15)

Remove the drain tee if installed.

Move the caps to the top of the trap and mount the trap externally to the right side of the unit using the two(2) screws provided.

Connect the corrugated drain tube from the transition box to the trap as shown. If an extension is required, use the black PVC tube connector and the black parts bag. Cut tube to length. Secure all connections with clamps.

Connect the drain hose from the Vent Drain to the trap. If an extension is required, use the black 1/2″ (12.7mm) OD barbed coupling, connect a black 1/2″ (12.7mm) ID elbow tube and a suitable section of a connection from the vent drain to the trap. Secure all connections with clamps.

/8″ (15.9mm) ID drain tube in the loose

/2″ (12.7mm) ID drain tube to make

Drain Tube) Black Rubber, 5/8 (15.9mm) ID Cut to fit & Clamps (loose parts bag)

25−24−69b

Install the vent pipe grommet into the casing

Cut an appropriate length of 2″ (50.8mm) PVC pipe long , enough to exit the cabinet and connect the vent drain to either:

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

Install tee trap into bottom section of tee and glue pipe.

Remove knockout from the side of the furnace casing where drain tube will exit.

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

Specifications are subject to change without notice.

440 01 2024 04

Page 25

Figure 16

Horizontal Left through Top

Vent Drain & Clamps

EXHAUST

Plastic Caps Yellow or black

Alternate Orientation

Dual Pressure Switch

OFF

AIR

FLOW

Single Pressure Switch Detail

AIR FLOW

Relief Tube Black Rubber

/16 (4.8mm) ID

Trap Connection

Preassemble & insert into furnace

Flexible tubing connector

/16 (4.8mm) OD (Loose

Parts Bag)

Relief Tube Extension Black Rubber 3/16 (4.8mm) ID Cut to Fit (Loose Parts Bag)

“Clamp ears” Pointed OUT

Field Supplied Tee

Tee Trap White PVC (loose parts bag)

Coupling & Clamps (Optional)

Cap and Clamp Open End

Representative drawing only, some models may vary in appearance.

Drain Tube Black Rubber

/2 (12.7mm) ID

& Clamps

Horizontal Left through Top (See Figure 16)

Disconnect the hoses from the trap assembly, and remove trap and trap mounting bracket from the blower compartment. Using cover plate and gasket provided in the loose parts bag, cover the hole from the burner compartment to the blower compartment and secure with screws. Remove knockout from the side of the furnace casing where drain tube will exit. Mount the trap externally to the bottom side of the unit using the two screws provided in the location shown. Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the trap. Secure connections with clamps. Remove the black Install a yellow cap and clamp over the open drain port of the drain tee. Connect the black to the trap. Secure connections with clamps.

/2″ (12.7mm) ID drain tube from the drain tee.

/2″ (12.7mm) ID drain tube from the Vent Drain

Drain Tube Corrugated

/8 (15.9mm) ID & Clamps Remove KO before mounting Trap

Cut at straight section

Leave room for clamp

Connect the 3/16″ (4.8mm) ID relief tube to the middle port on the trap. If an extension is required, use the

Cut Here

25−24−70

/16″ (4.8mm) OD flexible tubing connector and the black 3/16″ (4.8mm) ID relief tube in the loose parts bag. Cut tube to length. Secure all connections with clamps.

Cut an appropriate length of 2″ (50.8mm) PVC pipe, long enough to exit the cabinet and connect the vent drain to either:

• A 2″ (50.8mm) PVC coupling fastened onto the drain tee Install tee trap into bottom section of tee and glue pipe. Connect the tee trap and the main drain line exiting the casing as

shown in Figure 20. Note: It is recommended that all PVC piping and fitting

connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

440 01 2024 04

Specifications are subject to change without notice.

Page 26

Figure 17

Horizontal Left−Side Vent

Alternate Orientation

Field Supplied Tee

Tee Trap White PVC (loose parts bag)

On Some Models ONLY

Single Pressure Switch Detail

Yellow or black Plastic Cap

EXHAUST

INLET

Level or Sloped towards Tee

Dual Pressure Switch

Relief Tube Black Rub ber 3/16 (4.8mm) ID

OFF

FLOW

AIR

Vent Drain & Clamps

Elbow Tube Black Rubber 1/2 (12.7mm) ID & Clamps (Loose Parts Bag)

Barbed Coupling 1/2 (12.7mm) OD (Loose Parts Bag)

Drain Tube Black Rubber

/2 (12.7mm) ID & Clamps

Representative drawing only, some models may vary in appearance.

Horizontal Left−Side Vent (See Figure 17)

Remove the drain tee from the Vent Drain if installed (*9MPD models only)

Rotate the inducer 180 inducer attachment screws. Reinstall and retighten the inducer screws to 20″ pounds torque. Disconnect the hoses from the trap assembly, and remove trap and trap mounting bracket from the blower compartment. Using cover plate and gasket provided in the loose parts bag, cover the hole from the burner compartment to the blower compartment and secure with screws. Remove knockout from the side of the furnace casing where drain tube will exit. Mount the trap externally to the bottom side of the unit using the two screws provided in the location shown. Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the trap. Secure connections with clamps. Connect the black to the trap. If an extension is required, use the black 1/2″ (12.7mm) OD flexible tubing connector and the black 1/2″ (12.7mm) ID drain tube in the loose parts bag. Cut tube to length. Secure connections with clamps.

° for a side vent after loosening the 4

/2″ (12.7mm) ID drain tube from the Vent Drain

Flexible Tube Connector 3/16 (4.8mm) OD (Loose Parts Bag)

Relief Tubing Extension Black Rubber 3/16 (4.8mm) ID Cut to Fit (Loose Parts Bag)

Connect the trap. If an extension is required, use the tubing connector and the black 3/16″ (4.8mm) ID relief tube in the loose parts bag. Cut tube to length.

Cut an appropriate length of 2″ (50.8mm) PVC pipe, fittings and extension pipe long enough to exit the cabinet and connect the vent drain to either:

• A 2″ (50.8mm) PVC coupling fastened onto the drain tee Install tee trap into bottom section of tee and glue pipe.

Important: The pipe to the tee trap must be level or sloping towards the tee trap

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

Specifications are subject to change without notice.

Drain Tube Corrugated

/8 (15.9mm) ID & Clamps

Cut at straight section

WARNING Move Caps to top of trap

/16″ (4.8mm) ID relief tube to the middle port on the

Leave room for clamp

/16″ (4.8mm) OD flexible

Cut Here

25−24−70a

440 01 2024 04

Page 27

Figure 18

Horizontal Right through Top

Trap Connection

“Clamp ears” Pointed OUT

Preassemble & insert into furnace

Relief Tube Black Rub ber 3/16 (4.8mm) ID

Flexible Tubing Connector

/16 (4.8mm) OD (Loose

Parts Bag)

Relief Tube Extension Black Rubber 3/16 (4.8mm) ID Cut to Fit (Loose Parts Bag)

Single Pressure Switch Detail

AIRFLOW

Drain Tube Black Rubber 1/2 (12.7mm) ID & Clamps

WARNING Add Cap and Clamp

/16 (4.8mm) ID Rub

ber Tube

Coupling & Clamps (Optional)

OFF

Plastic Cap Yellow or black

Vent Drain & Clamps

Alternate Orientation

EXHAUST

Field Supplied Tee

Tee Trap White PVC (loose parts bag)

INLET

On Some Models ONLY

Dual Pressure Switch

Drain Tube Corrugated 5/8 (15.9mm) ID & Clamps Cut at straight section

Leave room for clamp

Representative drawing only, some models may vary in appearance.

Cut Here

Horizontal Right through Top (See Figure 18)

Remove knockout from the side of the furnace casing where drain tube will exit.

Mount the trap externally to the bottom side of the unit using the two(2) screws provided in the location shown.

Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the trap. Secure connections with clamps.

Connect the black to the trap. If an extension is required, use the black 1/2″ (12.7mm) OD barbed coupling and the black 1/2″ (12.7mm) ID drain tube in the loose parts bag. Cut tube to length. Secure connections with clamps.

/2″ (12.7mm) ID drain tube from the Vent Drain

Barbed Coupling 1/2 (12.7mm) OD (Loose Parts Bag)

Drain Tube Black Rubber

/2 (12.7mm) ID & Clamps

Remove KO before mounting Trap

25−24−70b

Connect the trap. If an extension is required, use the clear

/16″ (4.8mm) ID relief tube to the middle port on the

/16″ (4.8mm) OD flexible tubing connector and the black 3/16″ (4.8mm) ID relief tube in the loose parts bag. Cut tube to length.

Cut an appropriate length of 2″ (50.8mm) PVC pipe, fittings and extension pipe long enough to exit the cabinet and connect the vent drain to a standard field supplied 2″ (50.8mm) PVC tee

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

Install tee trap into bottom section of tee and glue pipe.

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

440 01 2024 04

Specifications are subject to change without notice.

Page 28

Figure 19

Single Pressure Switch Detail

Horizontal Right−Side Vent

Plastic Cap Yellow or black

Trap Connection

FLOW

AIR

“Clamp ears” Pointed OUT

Coupling & Clamps (Optional)

Relief Tube Black Rubber 3/16 (4.8mm) ID

Flexible Tubing Connector 3/16 (4.8mm) OD (Loose Parts Bag)

Relief Tube Extension Black Rubber 3/16 (4.8mm) ID Cut to Fit (Loose Parts Bag)

Drain Tube Black, 5/8 (15.9mm) ID & Clamps Corrugated Cut at straight section

Representative drawing only, some models may vary in appearance.

Preassemble & insert into furnace

Dual Pressure Switch

Leave room for clamp

Cut Here

Vent Drain & Clamps

Level or Sloped towards Tee

OFF

Remove KO before mounting Trap

Drain Tube Black Rubber

/2 (12.7mm) ID

& Clamps

Field Supplied Tee

EXHAUST

Tee Trap White PVC (loose parts bag)

Elbow Tube Black Rubber

/2 (12.7mm) ID & Clamps

(Loose Parts Bag)

On Some Models ONLY

INLET

Alternate Orientation

Barbed Coupling 1/2 (12.7mm) OD (Loose Parts Bag)

25−24−70c

Horizontal Right−Side Vent (See Figure 19)

Disconnect drain tee if installed

Remove knockout from the side of the furnace casing where drain tube will exit.

Mount the trap externally to the bottom side of the unit using the two(2) screws provided in the location shown.

Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the trap. Secure connections with clamps.

Connect the black 1/2″ (12.7mm) ID drain tube from the Vent Drain to the trap. If an extension is required, use the 1/2″ (12.7mm) OD barbed coupling and the black loose parts bag. Cut tube to length. Secure connections with clamps.

Connect the 3/16″ (4.8mm) ID relief tube to the middle port on the trap. If an extension is required, use the clear 3/16″ (4.8mm) OD

/2″ (12.7mm) ID drain tube in the

splice connector and the black loose parts bag. Cut tube to length.

Cut an appropriate length of 2″ (50.8mm) PVC pipe, fittings and extension pipe long enough to exit the cabinet and connect the vent drain to either:

• A 2″ (50.8mm) PVC coupling fastened onto the drain tee Install tee trap into bottom section of tee and glue pipe.

Important: The pipe to the tee trap must be level or sloping towards the tee trap

Connect the tee trap and the main drain line exiting the casing as shown in Figure 20.

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both

the external trap and the external tee trap must be primed before operation. Verify all condensate drain connections are

securely clamped. A coupling and clamps (in loose part bag) may be installed as shown for future servicing of the vent system.

Specifications are subject to change without notice.

/16″ (4.8mm) ID relief tube in the

440 01 2024 04

Page 29

Figure 20

Open Tee

Evaporator Coil Drain Line (Optional)

Main Drain Line

Condensate Trap

Representative drawing only, some models may vary in appearance.

Connecting Tee Trap to Condensate Trap and Main Drain Line

INLET

EXHAUST

OFF

Tee Trap

The tee trap must be connected to the main condensate drain line as conceptually shown above. Different installations may require slightly different orientations. The following steps apply to all installations.

1. The tee trap should be installed as close to the side or top of the furnace as practical. Minimize the distance between the inducer and the tee trap as much as possible.

2. An open tee is to be used at the tee trap discharge. The top end of the tee should be open to the atmosphere to eliminate potential air lock problems.

3. The drain line from the tee trap is to be connected to the furnace condensate trap drain line as shown above.

4. Condensate drain lines from a cooling coil may be connected downstream of the connection point of the tee trap and furnace condensate trap.

Important: Prime both traps with water before operation.

Failure to prime the traps may result in discharge of flue gases from the condensate drain line and open tee for a period of time, and may result in temporary lockout of the furnace upon start up. Main drain line construction is left to the discretion of the installer. It may be made of either ridged pipe or flexible tube. Tube ID should NOT be less than

(12.7mm).

″

Connecting Vent and Combustion Air Piping

! CARBON MONOXIDE POISONING HAZARD

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

Cement or mechanically seal all joints, fittings, etc. to prevent leakage of flue gases.

WARNING

Refer to Figure 11 through Figure 19 that corresponds to the installation position of the furnace for the application.

Preassemble the vent and combustion air piping from the furnace to the vent termination. Do not cement the pipe joints until the pipe preassembly process is complete.

Combustion Air Pipe Connection (Direct Vent)

Install the air intake coupling and gasket to the furnace with the four(4) screws.

Note: The air intake coupling and gasket can be installed to the top panel to the alternate air intake locations on either the left or right side panels of the furnace.

For downflow installation, the air intake coupling and gasket must be installed to the alternate air intake location on either the left or right side panels. Remove the 3″ (76.2mm) hole plug from the furnace accessory bag and relocate to the open hole in the furnace panel. Use four screws to seal the four mounting holes in the top panel next to the hole plug. Drill four

/64″ (2.8mm) diameter holes

in the casing using the air intake coupling as the template. The air intake coupling is sized for 2″ (50.8mm) PVC pipe. Install the combustion air pipe to the air intake coupling using RTV

sealant to provide for future serviceability.

Vent Pipe Connection

Install the vent pipe grommet to the furnace panel. Locate the grommet in the furnace panel at a location directly away from the vent fitting on the combustion blower. The grommet snaps into the 3″ (76.2mm) hole from the furnace panel. NOTE: Depending on the installation position, the vent pipe grommet will be installed to the top panel or to the alternate location on the side panels. If needed, remove the 3″ (76.2mm) hole plug from the loose parts bag and install it in the open hole in the furnace panel. (See Figure 11 or Figure 20)

Install the vent pipe to the rubber coupling, the vent fitting or the PVC vent extension pipe. Securely attach using the clamp or PVC cement as required.

Note: The vent fitting MUST be installed with the air flow marking arrow pointed toward the vent pipe. (See Figure 21) Some installations require the vent fitting to be installed with a 5 to 10 downward slope. (See Figure 11 thru Figure 20)

Figure 21

Rubber Coupling & Clamps

Vent Pipe

Drain Tee

Vent Extension Pipe (Side Panel Exit)

Tee Trap

NOTE: Built-in channel will be angled 5° to 10° also.

Proper Sealing Procedure for

Combustion Blower

Vent Pipe (Top Panel Exit)

SIDE VIEW

Rotate downward 5 to 10

Vent Fitting & Clamps

Combustion Blower

25-24-14a

440 01 2024 04

Specifications are subject to change without notice.

Page 30

Joining Pipe and Fittings

SEE VENT AND COMBUSTION AIR PIPING, Vent and Combustion Air Piping Guidelines in this manual for applicable

ASTM Standards for vent materials.

CARBON MONOXIDE POISONING HAZARD

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

Do NOT use solvent cement that has become curdled, lumpy or thickened and do NOT thin. Observe precautions printed on containers. For applications below 32° F(0°C), use only low temperature type solvent cement. Poor joints may lead to disconnected or leaking vent pipe joints allowing carbon monoxide to enter the living space.

WARNING

1. Install all couplings, nipples and elbows using proper

procedures for Joining Pipe and Fittings and maintain spacing between vent and combustion air piping as indicated in Figure 22 through Figure 30.

Figure 22

8” (203.2mm)* MIN. 20’ (6.1m) MAX

Sidewall Termination 12″ (304.8mm) or More Above Snow Level or Grade Level

*18 (457.2mm) Minimum for cold climates [sustained 0_F (-17_C) and below for 24 or more consecutive hours]

8” (203.2mm) MIN.

12 ” (304.8mm) MIN.

1. Cut pipe end square, remove ragged edges and burrs.

Chamfer end of pipe, then clean fitting, socket and pipe joint of all dirt, grease, or moisture.

NOTE: Stir the solvent cement frequently while using. Use a natural bristle brush or the dauber supplied with the cement. The proper brush size is one inch.

2. After checking pipe and socket for proper fit, wipe socket

and pipe with cleaner-primer. Apply a liberal coat of primer to inside surface of socket and outside of pipe. Do NOT allow primer to dry before applying cement.

3. Apply a thin coat of cement evenly in the socket. Quickly

apply a heavy coat of cement to the pipe end and insert pipe into fittings with a slight twisting movement until it bottoms out.

NOTE: Cement MUST be fluid while inserting pipe. If NOT, recoat pipe.

4. Hold the pipe in the fitting for 30 seconds to prevent the

tapered socket from pushing the pipe out of the fitting.

5. Wipe all excess cement from the joint with a rag. Allow 15

minutes before handling. Cure time varies according to fit, temperature and humidity.

Connecting Vent Pipes and Termination

NOTE: Combustion air intake and vent MUST terminate in the same atmospheric pressure zone. If installation is in a cold climate (sustained temperatures 0°F (−17°C) and below for 24 or more consecutive hours), increase the minimum distance between vent pipe and air intake from 8″ (203.2mm) to 18″(457.2mm).

CARBON MONOXIDE POISONING HAZARD

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

Maintain a minimum of 36″ (914.4mm) between combustion air inlet and clothes dryer vent. Terminate the combustion air intake as far as possible from any air conditioner, heat pump, swimming pool, swimming pool pumping, chlorinator or filtration unit.

WARNING

GRADE LEVEL

SNOW LEVEL

25-00-05F

Horizontal Termination

1. Cut two holes. 21/2″ (63.5mm) for 2″ (50.mm) pipe, 3″ (76.2mm) for 21/2″ (63.5mm) pipe, or 31/2″ (88.9mm) for 3″ (76.2mm) pipe. Do NOT make the holes oversized, or it will be necessary to add a sheet metal or plywood plate on the outside with the correct size hole in it.

2. Check hole sizes by making sure it is smaller than the couplings or elbows that will be installed on the outside. The couplings or elbows MUST prevent the pipe from being pushed back through the wall.

3. Extend vent pipe and combustion air pipe through the wall

/4″ (19.1mm) to 1″ (25.4mm) and seal area between pipe

and wall.

4. Install the couplings, nipple and termination elbows as shown and maintain spacing between vent and combustion air piping as indicated in Figure 22 and Figure 23.

A metal shield is recommended 18″ x 18″ (457.2mm x 457.2mm) min. or 18″ (457.2mm) min. diameter around the vent termination at the exterior wall to protect the house exterior materials from flue product or condensation (freezing) damage.

Using Exterior Risers

1. Install elbows and pipe to form riser as shown in Figure 23.

2. Secure vent pipe to wall with galvanized strap or other rust resistant material to restrain pipe from moving.

3. Insulate pipe with Armaflex or equivalent moisture resistant closed cell foam insulation or Fiberglass insulation if boxed in and sealed against moisture.

Vertical Termination

1. Figure 25 shows the proper installation and clearances for vertical vent termination. The vertical roof termination should be sealed with a plumbing roof boot or equivalent flashing. The inlet of the intake pipe and end of the exhaust vent must be terminated no less than 12″ (307.8mm) above the roof or snow accumulation level, and 12″ (307.8mm) away from a vertical wall or other protrusion.

Specifications are subject to change without notice.

440 01 2024 04

Page 31

2. If the vent system is installed in an existing chimney make

sure clearances shown in Figure 25 are maintained. Horizontal section before the termination elbow can be extended on the inlet air to provide necessary clearance.

Sidewall Termination with Exterior

Figure 23

Risers to Get Above Snow Level or Grade Level

8” (203.2mm)* MIN.

20’ (6.1m) MAX

*18 (457.2mm) Minimum for cold climates [sustained 0_F (-17_C) and below for 24 or more consecutive hours]

Figure 25

Rooftop Termination

Figure 24

FRONT VIEW

8” (203.2mm) MIN.

12 ” (304.8mm) MIN.

GRADE LEVEL

SNOW LEVEL

25-00-04F

Recommended Alternate Installation

for Sustained Cold Weather [0 F(-17C) & below for 24 hours or more consecutive hours]

OVERHANG

EXHAUST

12 (304.8mm) MIN.

90

INLET

12 (304.8mm) MIN. Ground Level OR Snow Level

SIDE VIEW

25-23-73

25−00−06

A = 12″ (304.8mm) Above roof or snow accumulation level B = 8″ (203.2mm) Min., 20′ (6.1m) Maximum, except in areas with extreme cold temperatures [sustained 0°F(−17°C) and below for 24 or more consecutive hours], the 18″ (457.2mm) Min.

Vent Termination Shielding

Under certain wind conditions some building materials may be affected by flue products expelled in close proximity to unprotected surfaces. Sealing or shielding of the exposed surfaces with a corrosion resistant material (such as aluminum sheeting) may be required to prevent staining or deterioration. The protective material should be attached and sealed (if necessary) to the building before attaching the vent terminal.

Multi Vent Termination Clearances

When two (2) or more furnaces are vented near each other, each furnace must be individually vented.

Two (2) vent terminations may be installed as shown in Figure 26, Figure 27, Figure 28, Figure 29, and Figure 30 but the next vent termination must be at least 36″ (914.4mm) away from first two terminations. It is important that vent terminations be made as shown to avoid recirculation of flue gases.

Figure 26

Concentric Vent and Combustion−Air Roof Termination

2” (50.8mm) Max

36” Min

(914.4mm)

Exhaust

Same Joist Space

440 01 2024 04

12 (304.8mm) MIN.

Specifications are subject to change without notice.

12 (304.8mm) Min. Grade or Snow Level

Combustion Air

36”Min

(914.4mm)

Page 32

Figure 27

Concentric Vent and Combustion−Air Sidewall Termination

Figure 29

Sidewall Inlet Vent and Exhaust−Air Termination with Exterior Risers

1 (25.4mm)

Combustion Air

Vent

Dimension “A” is touching or 2″ (50.8mm) maximum separation.

Figure 28

Inlet

12 (304.8mm) Min. Grade or Snow Level

Dimension “A” is touching or 2″ (50.8mm) maximum separation.

Exhaust

Sidewall Inlet Vent and Exhaust−Air Termination

“A”

Maximum

Vent

“A”

Exhaust

8 (457.2mm) Min. 20 (6.1m) Max.

18 (457.2mm) Min. for Cold Climates [Sustained 0F(-17C) and below for 24 hours or more consecutive hours]

25-22-02d

8 Min.

“A”

8 (203.2mm) Min.

12 (457.2mm) Min. Grade or

Inlet

Snow Level

Exhaust

8 (203.2mm) Min. 20 (6.1m) Max.

Exhaust

18 (457.2mm) Min. for Cold Climates

“A”

Dimension “A” is touching or 2″ (50.8mm) maximum separation.

Figure 30

12 (304.8mm) Min. Grade or Snow Level

Rooftop Inlet Vent and Exhaust−Air Termination

8 (203.2mm) Min. 20 (6.1m) Max.

Inlet

[Sustained 0F(-17C) and below for 24 hours or more consecutive hours]

18 (457.2mm) Min. for Cold Climates [Sustained 0F(-17C) and below for 24 hours or more consecutive hours]

25-22-43

Concentric Vent Termination

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD

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

Inlet and outlet pipes may NOT be vented directly above each other (standard vent terminals).

Concentric Vent Termination Kit # NAHA001CV & NAHA002CV

For Concentric Vent Termination information call 931.270.4100 with the complete model and serial number of the furnace.

Refer to Special Venting Requirements for Installations in Canada in the Vent and Combustion Air Connections Section.

These kits are for vertical or horizontal termination of the combustion air inlet and the exhaust vent pipes on Category IV gas−fired condensing furnaces. The NAHA001CV kit can be used for 3″ (76.2mm) diameter pipe systems. The NAHA002CV kit can be used for 2″ (50.8mm) diameter pipe system. Refer to Table 5 for the correct pipe size for the furnace. Both the combustion air inlet and the exhaust vent pipes must attach to the termination kit. The termination kit must terminate outside the structure and must be installed per the instructions outlined below for vertical or

WARNING

horizontal termination. Vertical termination is preferred. Field supplied pipe and fittings are required to complete the installation.

Concentric Termination Kit

Table 5

NAHA001CV & NAHA002CV Venting

Table Dual Piping ONLY

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

NAHA002CV − 35 (10.7m) & (4) 90° elbows

80,000, 100,000 & 125,000 Btuh Furnaces

NAHA001CV − 35′ (10.7m) & (4) 90° elbows

1. Do not include the field supplied 45° elbow in the total elbow count.

2. If more than four elbows are required, reduce the length of both the inlet and the exhaust pipes five feet for each additional elbow used.

3. Elbows are DWV long radius type for 2 (76.2mm) vents.

NOTE: The minimum vent length is 5 (1.5m) of PVC. Feet of pipe is whichever pipe run is the longest, either inlet or outlet side.

If more than four elbows are required, reduce the length of both the inlet and exhaust pipes 5′ (1.5m)for each additional elbow used.

with 2″ (50.8mm) PVC pipe

with 3″ (76.2mm) PVC pipe

″ (50.8mm) and 3″

Specifications are subject to change without notice.

440 01 2024 04

Page 33

Gas Supply and Piping

FIRE AND EXPLOSION HAZARD

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

Models designated for Natural Gas are to be used with Natural Gas ONLY, unless properly converted to use with Propane gas.

NOTE: The rating plate is stamped with the model number, gas

type and gas input rating.

Gas Supply Requirements

FIRE HAZARD

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

Do NOT set input rating above that shown on rating plate.

Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers.

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

• Use only the Type of gas approved for this furnace. See

rating plate for approved gas type.

• A

/8″ NPT plugged tapping, accessible for a test gauge connection,must be installed immediately upstream of the gas supply connection to furnace.

• Gas supply pressure should be within minimum and

maximum values listed on rating plate. Pressures are usually set by gas suppliers.

• Gas input must not exceed the rated input shown on the

rating plate. Overfiring will result in failure of heat exchanger and cause dangerous operation.

• Do not allow minimum supply pressure to vary downward.

Doing so will decrease input to furnace. Refer to Table 6 for Gas supply. Refer to Table 7, Table 8, Table 9 and

Table 10 for manifold pressures.

Table 6 Gas Pressures

Gas Type

Natural 7 in wc

Propane 11 in wc

Gas Piping Requirements

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

NOTE: In the state of Massachusetts.

a. Gas supply connections MUST be performed by a

licensed plumber or gas fitter.

WARNING

Supply Pressure

Recommended Max. Min.

(1744 Pa)

(2740 Pa)

14 in wc

(3487 Pa)

14 in wc

(3487 Pa)

4.5 in wc

(1121 Pa)

11 in wc

(2740 Pa)

b. When flexible connectors are used, the maximum length

shall not exceed 36″ (915 mm).

c. When lever handle type manual equipment shutoff

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

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

by the state of Massachusetts.

1. Install gas piping in accordance with local codes, or in the absence of local codes, the applicable national codes. Refer to NFPA 54/ANSI Z223.1 for proper gas pipe size.

2. It is recommended that a manual equipment shutoff valve be installed in the gas supply line outside the furnace. Locate valve as close to the furnace as possible where it is readily accessible. Refer to Figure 31.

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

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

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

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

7. Install a manual shut−off valve external to furnace casing and tighten all joints securely.

8. If local codes allow the use of flexible gas appliance connectors, always use a new listed connector. Do not use a connector which has previously serviced another gas appliance.

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

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

NOTE: Refer to Figure 31 or Figure 32 for the general layout at the furnace. The rules listed apply to natural and Propane gas pipe installations.

NOTE: On the Dual Certified or Direct Vent models, install the gas pipe grommet to the furnace side panel with the gas pipe entry. If needed, remove the 2″ (50.8mm) hole plug from the plastic accessory bag and relocate to the open hole in the furnace side panel.

WARNING

FIRE OR EXPLOSION HAZARD

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

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

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

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

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

440 01 2024 04

Specifications are subject to change without notice.

Page 34

Figure 31

Typical Gas Piping for Upflow

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

Use elbows and 3 (76.2mm) pipe nipple to connect valve to piping when using right side gas pipe entry.

Propane low pressure switch.

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

Representative drawing only, some models may vary in appearance.

Figure 32

Typical Gas Piping for Downflow

Use elbows and 3 (76.2mm) pipe nipple to connect valve to piping when using left side gas pipe entry.

3 (76.2mm) pipe nipple

Vent Pipe Grommet (Single Pipe)

Manual shut-off valve

Alternative installation

25−25−45

Propane Low pressure switch. Optional Propane conversion.

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

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

Representative drawing only, some models may vary in appearance.

Additional Propane Connection Requirements

1. Have a licensed Propane gas dealer make all connections at storage tank and check all connections from tank to furnace.

2. If copper tubing is used, it MUST comply with limitation set in National Fuel Gas Code or CGA codes.

3. Two−stage regulation of Propane gas is recommended.

Propane Conversion

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

Manual shut-off valve

Alternative installation

Vent Pipe Grommet (Single Pipe)

WARNING

FIRE, EXPLOSION HAZARD

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

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

Specifications are subject to change without notice.

440 01 2024 04

Page 35

General Derating Rules

1. These furnaces may be used at full input rating when installed at altitudes up to 2,000′ (609.6m). When installed above 2,000′ (609.6m), the input must be decreased 2% (Natural) or 4% (Propane) for each 1000′ above sea level in the USA. In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes 2000′ to 4500′ (609.6 to 1371.6m) above sea level.

2. For operation with natural gas at altitudes above 2,000′ (609.6m), orifice change and/or manifold pressure adjustments may be required for the gas supplied. First consult your local gas supplier, then refer to Table 7 or Table 8 for required pressure change and/or orifice change for high altitudes.

3. For operation with Propane gas, gas orifices MUST be changed and manifold pressure MUST be maintained as per Table 9 and Table 10. Orifices can be ordered through our distributor. (See Figure 33)

* Based on mid−range of elevation.

4. In cases where Table 7 or Table 8 is not applicable, eg. alternate input rate application, refer to above table for required high altitude input rate.

Nameplate Sea Level Input Rate x (Multiplier) *{

Elevation

ft (m)

2001′ - 3000′

(609.9 − 914.4){

3001′ - 4000′

(914.7 − 1219.2)

4001′ - 5000′

(1219.5 − 1524)

5001′ - 6000′

(1524.3 − 1828.8)

6001′ - 7000′

(1829.1 − 2133.6)

7001′ - 8000′

(2133.9 − 2438.4)

High Altitude Air Pressure Switch

Altitudes over 4,000′ (1219.2m) may require a different air pressure switch than the one installed at the factory. Check parts list for pressure switch and consult your distributor for part number and availability. In Canada, provincial codes may govern

High Altitude Input Rate =

High Altitude Multiplier

Natural Gas Propane Gas

0.95 0.90

0.93 0.86

0.91 0.82

0.89 0.78

0.87 0.74

0.85 0.70

installation of switch. Check with governing authorities. * In the USA, derating of these furnaces at 2% (Natural Gas)

and 4% (Propane Gas) has been tested and design−certified by CSA.

{ In Canada, the input rating must be derated 5% (Natural Gas)

and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to 1371.6m) above sea level. Use the 2001 to 3000 (609.9 to

914.4m) column in Table 7, Table 8, Table 9, and Table 10.

MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS

Table 7

HEATING VALUE at ALTITUDE

BTU/CU. FT.

700 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 41 3.7 1.8 725 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 41 3.7 1.8 41 3.4 1.7 750 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 41 3.5 1.7 42 3.6 1.7 775 −− −− −− −− −− −− −− −− −− −− −− −− 41 3.6 1.7 42 3.6 1.8 42 3.3 1.6 800 −− −− −− −− −− −− −− −− −− 41 3.6 1.8 42 3.7 1.8 42 3.4 1.7 42 3.1 1.5 825 −− −− −− −− −− −− 41 3.7 1.8 41 3.4 1.7 42 3.5 1.7 42 3.2 1.6 43 3.6 1.8 850 −− −− −− −− −− −− 41 3.5 1.7 42 3.6 1.7 42 3.3 1.6 43 3.7 1.8 43 3.4 1.7 875 −− −− −− 41 3.6 1.7 42 3.6 1.8 42 3.4 1.6 42 3.1 1.5 43 3.5 1.7 43 3.2 1.6 900 −− −− −− 42 3.7 1.8 42 3.4 1.7 42 3.2 1.6 43 3.6 1.7 43 3.3 1.6 44 3.5 1.7 925 41 3.7 1.8 42 3.5 1.7 42 3.3 1.6 43 3.7 1.8 43 3.4 1.7 43 3.1 1.5 44 3.3 1.6 950 41 3.5 1.7 42 3.3 1.6 42 3.1 1.5 43 3.5 1.7 43 3.2 1.6 44 3.4 1.7 44 3.1 1.5

975 42 3.7 1.8 42 3.2 1.6 43 3.6 1.8 43 3.3 1.6 44 3.5 1.7 44 3.2 1.6 45 3.6 1.7 1000 42 3.5 1.7 43 3.7 1.8 43 3.4 1.7 43 3.1 1.5 44 3.3 1.6 45 3.7 1.8 45 3.4 1.7 1050 42 3.2 1.6 43 3.3 1.6 43 3.1 1.5 44 3.3 1.6 45 3.6 1.8 −− −− −− −− −− −−

1100 43 3.6 1.7 44 3.5 1.7 44 3.2 1.6 45 3.6 1.8 −− −− −− −− −− −− −− −− −−

Conversion: 1 in wc = 249 Pa

NATURAL GAS MANIFOLD PRESSURE (in wc)

MEAN ELEVATION ABOVE SEA LEVEL ft(m)

0 to 2000

(0 to 609.6)

Orifice

Mnfld Pressure Orifice

No.

HI LO HI LO HI LO HI LO HI LO HI LO HI LO

2001 to 3000{

(609.9 to 914.4){

Mnfld Pressure Orifice

No.

3001 to 4000

(914.7 to 1219.2)

Mnfld Pressure Orifice

No.

4001 to 5000

(1219.5 to 1524)

Mnfld Pressure Orifice

No.

5001 to 6000

(1524.3 to 1828.8)

Mnfld Pres

No.

sure

6001 to 7000

(1829.1 to 2133.6)

Orifice

Mnfld Pres

No.

sure

7001 to 8000

(2133.9 to 2438.4)

Orifice

Mnfld Pres

No.

sure

NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1/NFPA 54−2009 or National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1−05.

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

{ In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to

1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 7, Table 8, Table 9, and Table 10.

440 01 2024 04

Specifications are subject to change without notice.

Page 36

Table 8

HEATING VALUE at ALTITUDE

BTU/CU. FT.

NATURAL GAS MANIFOLD PRESSURE (in wc) 20,000 BTU per burner

MEAN ELEVATION ABOVE SEA LEVEL ft(m)

Orifice

No.

0 to 2000

(0 to 609.6)

Mnfld Pres

sure

2001 to 3000{

(609.9 to 914.4){

Orifice

Mnfld Pres

No.

sure

HI LO HI LO HI LO HI LO HI LO HI LO HI LO

3001 to 4000

(914.7 to 1219.2)

Orifice

Mnfld Pres

No.

sure

4001 to 5000

(1219.5 to 1524)

Orifice

Mnfld Pres

No.

sure

5001 to 6000

(1524.3 to 1828.8)

Orifice

Mnfld Pres

No.

sure

6001 to 7000

(1829.1 to 2133.6)

Orifice

Mnfld Pres

No.

sure

7001 to 8000

(2133.9 to 2438.4)

Orifice

Mnfld Pres

No.

sure

700 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 44 3.7 1.8 725 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 44 3.7 1.8 44 3.4 1.7 750 −− −− −− −− −− −− −− −− −− −− −− −− −− −− −− 44 3.5 1.7 44 3.2 1.6 775 −− −− −− −− −− −− −− −− −− −− −− −− 44 3.5 1.7 44 3.2 1.6 46 3.8 1.9 800 −− −− −− −− −− −− −− −− −− 44 3.6 1.8 44 3.3 1.6 45 3.7 1.8 46 3.6 1.7 825 −− −− −− −− −− −− 44 3.7 1.8 44 3.4 1.7 45 3.8 1.8 46 3.6 1.8 47 3.8 1.9 850 −− −− −− −− −− −− 44 3.5 1.7 44 3.2 1.6 46 3.7 1.8 46 3.4 1.7 47 3.6 1.7 875 −− −− −− 44 3.5 1.7 44 3.3 1.6 46 3.8 1.9 46 3.5 1.7 47 3.7 1.8 48 3.8 1.9 900 −− −− −− 44 3.3 1.6 45 3.7 1.8 46 3.6 1.8 47 3.8 1.8 47 3.5 1.7 48 3.6 1.8 925 44 3.7 1.8 44 3.2 1.5 46 3.7 1.8 46 3.4 1.7 47 3.6 1.8 48 3.7 1.8 48 3.4 1.7 950 44 3.5 1.7 45 3.6 1.8 46 3.5 1.7 47 3.7 1.8 47 3.4 1.7 48 3.5 1.7 49 3.8 1.9 975 44 3.3 1.6 46 3.6 1.8 47 3.8 1.9 47 3.5 1.7 48 3.7 1.8 48 3.4 1.6 49 3.6 1.8

1000 44 3.2 1.6 46 3.4 1.7 47 3.6 1.8 48 3.8 1.8 48 3.5 1.7 49 3.8 1.8 49 3.4 1.7 1050 46 3.6 1.8 47 3.5 1.7 48 3.7 1.8 48 3.4 1.7 49 3.7 1.8 −− −− −− −− −− −−

1100 47 3.8 1.8 48 3.7 1.8 48 3.4 1.7 49 3.7 1.8 −− −− −− −− −− −− −− −− −−

Conversion: 1 in wc = 249 Pa

Bold− indicates factory orifice size.

NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI

Z223.1/NFPA 54−2009 or National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1−05.

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

{ In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to

1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 7, Table 8, Table 9, and Table 10.

Table 9 *9MPT & *9MPV PROPANE GAS MANIFOLD PRESSURE (in wc)

MEAN ELEVATION ABOVE SEA LEVEL ft(m)

HEATING VALUE

at ALTITUDE

BTU/CU. FT.

0 to 2000

(0 to 609.6)

2001 to 3000{

(609.9 to 914.4){

3001 to 3999

(914.7 to 1219.2)

4001 to 5000

(1219.5 to 1524)

5001 to 6000

(1524.3 to 1828.8)

6001 to 7000

(1829.1 to 2133.6)

7001 to 8000

(2133.9 to 2438.4)

HI LO HI LO HI LO HI LO HI LO HI LO HI LO

2500 10.0 4.9 10.0 4.9 9.0 4.4 10.0 4.9 9.4 4.6 8.5 4.2 10 4.9

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

Conversion: 1 in wc = 249 Pa

NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI

Z223.1/NFPA 54−2009 or National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1−05.

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

{ In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to

1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 7, Table 8, Table 9, and Table 10.

Table 10 *9MVX PROPANE GAS MANIFOLD PRESSURE (in wc) 20,000 BTU per burner

MEAN ELEVATION FEET ABOVE SEA LEVEL ft(m)

HEATING VALUE

at ALTITUDE

BTU/CU. FT.

2500 10.0 4.9 8.9 4.4 8.4 4.1 10.0 4.9 10.0 4.9 10.0 4.9 10.0 4.9

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

Conversion: 1 in wc = 249 Pa

NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI

Z223.1/NFPA 54−2009 or National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1−05.

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

{ In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to

1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 7, Table 8, Table 9, and Table 10.

0 to 2000

(0 to 609.6)

2001 to 3000{

(609.9 to 914.4){

3001 to 3999

(914.7 to 1219.2)

4001 to 5000

(1219.5 to 1524)

5001 to 6000

(1524.3 to 1828.8)

6001 to 7000

(1829.1 to 2133.6)

7001 to 8000

(2133.9 to 2438.4)

Hi Lo Hi Lo Hi Lo Hi Lo Hi Lo Hi Lo Hi Lo

Specifications are subject to change without notice.

440 01 2024 04

Page 37

The burner orifice part nos. are as follows:

Orifice Part # Orifice Part #

41 1096942 42 1011351 43 1011377 44 1011352 45 1011353 46 1011744 47 1011378 48 1113201 49 1113202 54 1011376 55 1011354 56 1011355

Changing Orifices for High Altitude

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

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

Turn OFF electric power at disconnect, lockout, and gas supply at manual valve in gas line and tag switch with a suitable warning label when installing orifices. Installation of orifices requires a qualified service technician.

NOTE: Main burner orifices can be changed for high altitudes.

1. Disconnect gas line from gas valve.

2. Remove manifold from furnace.

3. Remove the orifices from the manifold and replace them with properly sized orifices.

4. Tighten orifices so it is seated and gas tight. (See

Figure 33)

Figure 33

1.11″ (28.2mm)

1.21″ (30.8mm)

5. Reinstall manifold. Ensure burners do NOT bind on new orifices.

WARNING

Changing Orifices

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

Final Gas Piping Check

1. The furnace and the equipment shut off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess

/2″ PSIG. Close the manual shut−off valve before testing

at such pressures.

2. The furnace must be isolated from the gas supply system by closing the equipment shut off valve during any pressure testing of the gas supply system at test pressure equal to or less than

3. When installation is complete, test all pipe connections for leaks with the gas pressure less than valve.

4. Apply a commercial soap solution to all joints to test for leaks. Correct any leaks indicated by bubbles.

5. Correct even the smallest leak at once.

6. Check for leaks at gas valve and orifice connections to the burner manifold along with the pilot tube connections to the valve and pilot assembly while the furnace is operating.

FIRE OR EXPLOSION HAZARD

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

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 could result causing property damage, personal injury and/or loss of life.

RISQUE D‘INDENDIE OU D‘EXPLOSION

Le non−respect des avertissements de sécurité pourrait d‘entrainer des blessures graves, la mort ou des dommages matériels.

Ne jamais utiliser une flamme nue por vérifier la présence des fuites de gaz. Pour la vérification de tous les joints, utiliser plutôt une solution savonneuse commerciale fabriquée spécifiquement pur la détection des fuites de gaz. Un incendie ou une explosion peut entrainer des dommages matériels, des blessures ou la mort.

/2″ PSI.

/2″ PSIG to the gas

WARNING

AVERTISSEMENT

Electrical Wiring

ELECTRICAL SHOCK HAZARD

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

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

440 01 2024 04

WARNING

Power Supply Wiring

The furnace MUST be electrically wired and grounded in accordance with local codes, or in the absence of local codes with the latest edition of The National Electric Code, ANSI NFPA 70 and/or The Canadian Electric Code CSA C22.1.

Field wiring connections must be made inside the furnace connection box. A suitable strain relief should be used at the point the wires exit the furnace casing.

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

Copper conductors shall be used. Line voltage wires should conform to temperature limitation of 35° C rise and be sized for the

Specifications are subject to change without notice.

Page 38

unit maximum amps stated on the rating plate. Add the full load amps for potential field−installed accessories such as electronic air cleaners and humidifiers that would receive power from the furnace control board. The furnace control board is rated for a maximum of 1.0 amps combined for EAC and HUM. Consult NEC or local codes for proper wire and circuit sizing.

Junction Box (J-Box) Relocation

The J−Box is installed on left side of casing. An alternate J−Box location on right side can be used.

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

2. Remove two screws holding J−Box to casing.

3. Install large hole plug from loose furnace accessory bag into the left J−Box location.

4. Clip wire tie holding J−Box wires.

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

6. Apply two hole plugs from bag at left J−Box location.

Thermostat Heating

The two−stage furnace control board will operate with either a single stage or a two−stage heating thermostat and will provide two−stage heating operation.

For single−stage thermostat installations, the R and W wires from the thermostat connect to the R and W1 connections on the furnace control board. (See Figure 34 and wiring diagram)

Note: The TT (Thermostat Type) SW1 DIP switch #3 should be in the OFF position for the furnace to operate properly with a single−stage thermostat. Failure to change DIP switch with single−stage thermostat will result in Low Heat operation ONLY.

During operation, the furnace will operate on Low Heat for up to12 minutes. If the heat request exists for more than 12 minutes, the furnace will automatically shift to the High Heat mode for the remaining duration of the heating cycle.

For two−stage thermostat installations, the R, W1 and W2 wires from the thermostat connect to the R, W1 and W2 connections on the furnace control board. Set TT SW1 DIP switch #3 to ON position. During operation, the furnace will shift from Low Heat to High Heat as requested by the thermostat. (See Figure 34 and wiring diagram)

When using a non−electronic thermostat, the thermostat heat anticipator must be set to match the amp draw of the electrical components in R − W1 circuit. Accurate amp draw readings can be obtained at thermostat subbase terminals R to W1. For an electronic thermostat, set cycle rate for 3 cycles per hour.

Measure heat anticipator current in series from R to W1 at the thermostat. If 24VAC humidifier is wired up to control, humidifier must be energized. Allow furnace to operate for two minutes before recording the AC amperage reading. Set anticipator on thermostat to recorded value.

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

Low voltage connections to furnace must be made on terminal board to furnace control board. (See Figure 35)

Cooling *9MPT

If cooling is used, the Y and G from the thermostat must be connected to the control board Y/Y2 and G to energize cooling blower speed. NOTE: MPT models are not two−stage cooling compatible.

*9MPV, *9MVX

If single−speed cooling is used, the Y and G from the thermostat must be connected to the control board Y/Y2 and G to energize cooling blower speed. If two−stage cooling is used, the Y1, Y2, G of the thermostat must be connected to Y1 of tap select interface board for low cooling, Y/Y2 of the furnace control board for high cooling and G of the furnace control board for continuous fan speed.

Optional Equipment

All wiring from furnace to optional equipment MUST conform to local codes or, in the absence of local codes with the latest edition of The National Electric Code, ANSI NFPA 70 and/or The Canadian Electric Code CSA C22.1. Install wiring in accordance with manufacturer’s instructions. The wiring MUST have a minimum temperature rating of 105° C.

Humidifier/Electronic Air Cleaner

The furnace is wired for humidifier and/or electronic air cleaner connection.

HUMIDIFIER − The HUM (24V) terminal is energized when the low pressure switch closes on a call for heat. The HUM (115V) is energized when the inducer is energized.

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

REDUCED FURNACE LIFE HAZARD

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

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

Furnace Control Board

The furnace control board has a fixed blower ON delay of 30 seconds for High Heat calls and 45 seconds for Low Heat calls. The blower OFF timing is factory preset at 140 seconds. If desired, the fan OFF delay can be reset to obtain the longest delay times while still maintaining comfort levels. See “Furnace Wiring Diagram”.

Dehumidification - Variable Speed ONLY (*9MPV, *9MVX)

The furnace control board has a dehumidification feature which reduces cooling airflow by 20% when the DEHUM terminal ( male quick connect) is energized by 24VAC and there is a cooling call. DEHUM may be operated by a thermostat dehumidify (24VAC for dehumidify) command or a dehumidistat (switch closes on call for dehumidification) with one terminal connected to (Y1 for two−stage cooling or Y/Y2 for single−speed cooling applications) and the other terminal connected to DEHUM.

CAUTION

/4”

Specifications are subject to change without notice.

440 01 2024 04

Page 39

Figure 34

NOTE: Junction Box can be mounted to either the left or right side.

115V. 60 Hz.

NEUT.

HOT

Ground

LowVoltage

TerminalBoard

LowVoltage

TerminalBoard

SingleStage Thermostat

TwoStage

Thermostat

Connection

Box

Electrical Connections

Y/Y2

25−24−78a

Tap Select Interface Board (*9MPV, *9MVX)

The Tap Select Interface Board is used with the Variable Speed motor. There are DIP switches (SW2) for continuous blower adjust, heating blower adjust, cooling blower adjust and cooling on/off delay profiles. There is a jumper (J1) for slight blower adjustment, increase (+)/no change (NOM)/decrease (−). There is a jumper

(J2) for airflow selection of Heat Pump EFFICIENCY or COMFORT. (EFFICIENCY provides no airflow reduction in airflow

whether O is energized or not. COMFORT provides a 10% reduction in airflow when O is not energized with a cooling call).

The O terminal is available for use for Heat Pump applications, if desired.

The Y1 terminal (if a two−stage Air Conditioner or two−stage Heat Pump is used) will provide low cooling blower speed when energized. (Only Y/Y2 on the furnace control board is used if a single−stage Air Conditioner or Heat Pump is installed)

Figure 35

Dip Switch See “Wiring Diagram” for switch settings

24 VAC HUM

Control Connections

Diagnostic Light

115 VAC HUM

NOTE:115VAC/60Hz/single−−phase

Operatingvoltagerange*:127VACmax,104VACmin.

* Permissible limits of voltage at which unit will operate satisfactorily

Furnace Control Fuse

The 24V circuit contains a 5−amp, automotive−type fuse located on furnace control board. (See Figure 35) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.)

Ductwork and Filter

CARBON MONOXIDE POISONING HAZARD

Failure to properly seal duct could result in personal injury or death.

Do NOT draw return air from inside a closet or utility room. Return air duct MUST be sealed to furnace casing.

Installation

NOTE: Design and install the air distribution system to comply with Air Conditioning Contractors of America manuals and/or NFPA pamphlets 90A and 90B or other approved methods that conform to local codes and good trade practices.

1. When furnace supply ducts carry air outside furnace area, seal return air duct to furnace casing and terminate duct outside furnace space.

2. Install air conditioning cooling coil (evaporator) on outlet side of furnace.

3. For furnaces installed without a cooling coil, it is recommended that the outlet duct be provided with a

WARNING

FUSE

DEHUM

25−24−74

EAC

removable access panel. This panel should be accessible when the furnace is installed so the exterior of the heat exchanger can be viewed for inspections. The access panel MUST be sealed to prevent leaks.

4. If separate evaporator and blower units are used, install good sealing dampers for air flow control. Chilled air going through the furnace could cause condensation and shorten the furnace life.

NOTE: Dampers (field supplied) can be either automatic or manual. Manually operated dampers MUST be equipped with a means to prevent furnace or air conditioning operation unless damper is in the full heat or cool position.

WARNING

CARBON MONOXIDE POISONING HAZARD

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

Cool air passing over heat exchanger can cause condensate to form resulting in heat exchanger failure.

440 01 2024 04

Specifications are subject to change without notice.

Page 40

Connections

NOTE: Return air can enter through either side, both sides, the bottom or a side and the bottom. Return air can not rear of the furnace. When the furnace is located in an area near or adjacent to the living area, the system should be carefully designed with returns to minimize noise transmission through the return grille. Any blower moving a high volume of air will produce audible noise which could be objectionable to when the unit is located very close to living areas. It is advisable to route the return air ducts under the floor or through the attic.

1. For side connections using a 16″ x 25″ (406.4 x 635mm)

filter, cut out the embossed area shown in Figure 36. This will provide a 14

/2″ x 221/2″ (368.3 x 571.5mm)

approximate opening.

2. Bottom returns can be made by removing the knockout

panel in the furnace base. Do NOT remove knock-out except for a bottom return.

3. Installation of locking-type dampers are recommended in all branches, or in individual ducts to balance system’s air flow.

4. Non-combustible, flexible duct connectors are recommended for return and supply connections to furnace.

Figure 36

A = 141/2″ (368.3mm) Height of Cutout for 16″ x 25″ (406.4 x 635mm) Filter B = 221/2″ (571.5mm) Width of Cutout for 16″ x 25″ (406.4 x 635mm) Filter

Side Return Air Cutout

enter through

NOTE: Disposable, low velocity filters may be replaced with washable, high velocity filter providing they meet the minimum size areas. Washable, high velocity filters can be replaced ONLY with same type and size.

Figure 37

Side Mounted Filter Rack

25-20-90

Filter Installation using Filter Rack

When installing or removing a bottom mounted filter, slide the two side filter clips to the back of the furnace BEFORE installing or removing. This will allow the filter to clear the front raised edge of the furnace. Insert filter into side clips first and push filter back until it is fully engaged into back clip. When filter is in place, slide clips back into place midway on filter as shown in Figure 38 or

Figure 39.

Embossed Area on Side of Furnace

Furnace Bottom

NOTE: Furnaces with 5 TONS cooling rating may require two(2)

side returns or one side return with bottom return.

5. If air return grille is located close to the fan inlet, install at least one, 90° air turn between fan and inlet grille to reduce noise.

NOTE: To further reduce noise, install acoustical air turning vanes and/or line the inside of duct with acoustical material.

Sizing

Existing or new ductwork MUST be sized to handle the correct amount of airflow for either heating only or heating and air conditioning.

Insulation

1. Insulate ductwork installed in attics or other areas exposed to outside temperatures with a minimum of 2″ (50.8mm) insulation and vapor barrier.

2. Insulate ductwork in indoor unconditioned areas with a minimum of 1″ (25.4mm) insulation with indoor type vapor barrier.

Filters

A filter must be used: Filters are supplied with these furnaces, and additional filters may be purchased from your distributor. Use either filter type:

• Washable, high velocity filters are based on a maximum

air flow rating of 600 FPM.

• Disposable, low velocity filters are based on a maximum

air flow of 300 FPM when used with filter grille.

• See Technical Manual, Circulation Air Blower Data for

additional data.

Figure 38 Bottom Mounted Filter Rack

Center Clip side-to-side

9″ (152.4mm)

Slide filter clips towards back before removing

25-24-18-1

Figure 39 Filter Clip Construction

11/2″

(38.1)

26 Ga. Galvanized Steel FAST part number 1008482

Refer to Figure 40 and for guidelines to install filters. Furnaces which require larger filter media and have limited clearances on one side of furnace, require a standoff filter rack, see Figure 40, available from your distributor.

NOTE: If filters are only suitable for heating application, advise homeowner that filter size may need to be increased if air conditioning is added.

3″

(76.2)

11/4″

/16″

(31.8)

(27)

Specifications are subject to change without notice.

440 01 2024 04

Page 41

Figure 40

Using

Optional

Standoff Filter

Rack

Standoff Filter Rack

Downflow Furnace Installation Non-Combustible Floor Installation

Fabricate a plenum to the dimensions given in Table 11, for the furnace outlet. Plenum should be flanged, approximately 3/4″ (19.1mm)for support.

Note: The three(3) screws in the top panel of the furnace next to the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation

1. Position plenum through the floor and set the furnace over the opening in the floor. If necessary, grout around the base to seal air leaks between the base and the floor.

Combustible Floor Installation

FIRE HAZARD

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

25−21−45a

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

Addition Of Air Conditioning

When a refrigeration coil is used in conjunction with this unit, it must be installed parallel with or on the discharge side of the unit to avoid condensation on the heat exchanger. All furnaces are designed with a break−away duct flange on the supply air side of the furnace. This allows for installation in the horizontal right or downflow applications. The coil installation instructions must be consulted for proper coil location and installation procedures. With a parallel flow arrangement, dampers must be installed to prevent chilled air from entering the furnace. If manually operated dampers are used, they must be equipped with a means to prevent operation of either unit unless the damper is in full heat or full cool position.

A 3″ clearance is required on the right side of the furnace in order to run the condensate drain line. Copper or plastic tubing may be used for the condensate drain line.

The noncombustible subbase also must be used on downflow applications in addition to a coil box installation.

Subbase for Combustible Floor

NOTE: The three(3) screws in the top panel of the furnace next to the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation

Note: When using the subbase for combustible floors, the discharge air duct flanges on the furnace MUST be broken down to provide proper fit up to the subbase. Use duct pliers to bend the duct flanges flat onto the furnace casing. DO NOT bend the duct flanges inward (toward the heat exchangers) as air flow restrictions may occur.

Table 11 Subbases for Combustible Floors Dimensions − in(mm)

Sub−base for

Combustible Floors

Part Number

Furnace Only

NAHH001SB

NAHH002SB

NAHH003SB

NAHH010SB

Subbase for Coil Box

NAHH004SB

NAHH005SB

NAHH006SB 23 (284.2)

NAHH009SB

Outside Dimension

Base Spacer Side To Side

Conversion: 1 in = 25.4 mm

Sub−base for Combustible

Floor Dimensions

1511/ (398.5)

195/

(490.5) 2215/

(582.6)

2411/ (627.1)

153/

(25.4)

193/

(181.1)

243/

(628.7)

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

283/

(730.3)

283/

(730.3)

283/

(730.3)

283/

(730.3)

209/

(522.3)

209/

(522.3)

209/

(522.3)

209/

(522.3)

149/

(369.9)

183/

(462)

2113/

(554)

239/

(598.5)

149/

(369.9)

183/

(462)

2113/

(554)

239/

(598.5)

Opening In Floor

16(406.4)

161/

(408)

161/

(408)

161/

(408)

161/

(408)

161/

(412.8)

161/

(412.8)

161/

(412.8)

161/

(412.8)

161/

(412.8)

161/

(412.8)

161/

(412.8)

161/

(412.8)

145/

(371.5)

181/

(463.6)

217/

(555.6)

235/

(600.1)

145/

(371.5)

181/

(463.6)

217/

(555.6)

235/

(600.1)

WARNING

Opening In

Base For Plenum

15 (381)

131/

(342.9)

171/

(435.6)

193/

(501.7)

221/

(571.5)

131/

(342.9)

171/

(435.6)

193/

(501.7)

221/

(571.5)

Typical Plenum

Dimensions

15 (381)

(342.9)

(435.6)

(501.7)

(571.5)

342.9)

(

(435.6)

(501.7)

(571.5)

131/

171/

193/

221/

131/

171/

193/

221/

440 01 2024 04

Specifications are subject to change without notice.

Page 42

The Subbase for Combustible Floors MUST be used when a downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box.

1. Cut the opening in the floor according to Table 11. The hole in the floor must be cut to the dimensions listed in Table 11 since the base is equipped with locating tabs that center the base over the opening.

The opening in the base is 1

/4″ (31.8mm) shorter and 11/8″ (28.6mm) narrower than the recommended size of the opening in the floor. This is done to maintain clearance between the floor and the plenum.

2. Fabricate the plenum to the dimensions given in Table 11.

Note that the dimensions given are outside dimensions.

3. Set the base over the opening in the floor, centering it over the opening. Fasten the base to the floor with screws or nails. See Figure 41, Figure 42 and Figure 43.

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

Figure 41

Exploded View of Sub−Base for Furnace ONLY

Figure 43

Installation of Combustible Floor Base

Setting the Subbase

Furnace

Wood Floor

Plenum

25−20−46a

This subbase for combustible floors has been designed so that the height of the subbase raises the downflow coil off the floor to allow easy installation of the condensate drain. See Figure 44.

2″

(50.8mm)

Plenum

Hole in Floor

A = 4 1/4” (108mm) Minimum clearance from back of hole to wall or other obstruction.

2″ (50.8mm)

1″ (25.4mm)

25-20-46

5. Position furnace or coil cabinet and furnace on subbase so it aligns between the locating tabs.

Figure 42

Exploded View of Base for Downflow Cased Coil

Figure 44

Condensate Line Raised by Base

25−20−52

21/

″ (63.5mm)

11/

″ (38.1mm)

Specifications are subject to change without notice.

440 01 2024 04

Page 43

Checks and Adjustments

NOTE: Verify the input rate of the furnace.

WARNING

FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in

personal injury, death and/or property damage. Turn OFF gas at shut off before connecting

manometer.

Startup

NOTE: Refer to the start−up procedures in the “User’s Information Manual” or to the “Operating Instructions Label” on the furnace.

WARNING

FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in

personal injury, death, and/or property damage.

If any sparks, odors or unusual noises occur, immediately shut OFF power to furnace. Check for wiring errors or obstruction to blower.

Gas Supply Pressure

Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers.

Manifold Gas Pressure Adjustments

(High and Low Heat)

NOTE: Make adjustment to manifold pressure with burners operating.

! FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in

personal injury, death and/or property damage. Turn OFF gas at shut off before connecting

manometer.

1. With gas OFF, connect manometer to manifold pressure tap on the outlet of gas control valve. See Figure 45. Use a manometer with a 0 to 12 inches of water column range.

2. Turn gas ON. Operate the furnace on High Heat by using a jumper wire on the R to W1 & W2 thermostat connections on the furnace control board.

3. Remove manifold pressure adjustment screw cap on furnace gas control valve. Turn adjusting screw using 3/32 hex wrench, counterclockwise to decrease the manifold pressure and clockwise to increase pressure. See

Figure 45.

NOTE: Adjustment screw cover MUST be replaced on gas control

valve before reading manifold pressure and operating furnace.

WARNING

Figure 45

Regulator Adjustment Under Cap

INLET Pressure Tap − 1/

25-24-98a

4. Set manifold pressure to value shown in Table 7, Table 8, Table 9 or Table 10.

5. Operate the furnace on Low Heat by using a jumper wire on the R to W1 thermostat connections on the furnace control board. Note: The SW1 DIP switch #3 should be in the ON position to set the Low Heat manifold pressure. (See wiring diagram.)

6. Repeat steps 3 and 4 for Low Heat operation.

7. When the manifold pressures are properly set, replace the adjustment screw covers on the gas control valve.

8. Remove the jumper wires from the thermostat connections on the furnace control board. Remove manometer connection from manifold pressure tap, and replace plug in gas valve.

9. Return SW1 DIP switch #3 to previous setting.

10. Check for leaks at plug.

Typical Gas Control Valve Honeywell

HONEYWELL

OFF

OUTLET Pressure Tap − 1/

Natural Gas Input Rating Check

NOTE: The gas meter can be used to measure input to furnace. Rating is based on a natural gas BTU content of 1,000 BTU’s per cubic foot. Check with gas supplier for actual BTU content.

1. Turn OFF gas supply to all appliances and start furnace. Use jumper wire on R to W1 and W2 for High Heat.

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

3. Repeat steps 1 and 2 with jumper wire on R to W1 for Low Heat. NOTE: If meter uses a 2 cubic foot dial, divide results (seconds) by two.

NOTE:SW1 DIP switch #3 must be in ON position. (See Furnace Wiring Diagram). Return SW1 DIP switch #3 to previous setting after check.

Example (BTUH)

Natural Gas

BTU Content

per cu. foot

1,000 3,600 48 75,000

To Determine the appliance kW input rate from a .05m has been clocked at 80 seconds for one complete revolution.

No. of

Seconds

Per Hour

1,000 x 3,600 ÷ 48 = 75,000 BTUH

Time Per

Cubic Foot in

Seconds

BTU Per

Hour

test dial that

440 01 2024 04

Specifications are subject to change without notice.

Page 44

Example (kW)

Number of

seconds per

hour

3,600 80 .05 2.25

4. Remove jumper wire from R to W1 and W2.

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

Number of

seconds per

complete

rotation

3,600 ÷ 80 x .05 = 7.2 m3/h

2.25m3/h x 10.35 kWh/m

23.28 x 3.412 = 79,431 BTU

Size of test dial

(.05m3)

= 23.28 kW

kW m3/h

Main Burner Flame Check

Allow the furnace to run approximately 10 minutes then inspect the main burner and pilot flames. See Figure 46.

Check for the following (Figure 46):

• Stable and blue flames. Dust may cause orange tips or

wisps of yellow, but flames MUST NOT have solid, yellow tips.

• Flames extending directly from burner into heat exchanger.

• Flames do NOT touch sides of heat exchanger

If any problems with main burner flames are noted, it may be necessary to adjust gas pressures, or check for drafts.

Figure 46

NOTE: For Ignitor location see Figure 47.

Figure 47

(52.4)

/16(8)

Main Burner

Burner Face

Ignitor Location in(mm)

10−10−78

/4(6.4)

2. Operate furnace on High Heat for 10 minutes with all the registers and duct dampers open by using a jumper wire on R to W1 and W2 thermostat connections on the furnace control board. Note: The SW1 DIP switch #3 should be in the on position. (See furnace wiring diagram)

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

4. If the temperature rise is not in the correct range, the blower speed must be changed. A higher blower speed will lower the temperature rise. A lower blower speed will increase the temperature rise.

5. Repeat steps 2 thru 4 with the furnace operating on Low Heat for 10 minutes by using a jumper wire on the R to W1 thermostat connections on the furnace control board.

6. Remove the jumper wire after the adjustments are complete. Return SW1 DIP switch #3 to previous setting.

Blower Adjustments (*9MPT)

Changing Blower Speed

ELECTRICAL SHOCK HAZARD

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

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

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

for this product are based on a nominal 400 CFM (189 L/s) per ton cooling and the basic mid range on the temperature rise for heating.

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

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

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

furnace life.

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

WARNING

CAUTION

NOTE:

Flame sensor has a different orientation in all 040 & 050 models.

Temperature Rise Check

The blower speed MUST be set to give the correct air temperature rise through the furnace as marked on the rating plate for both High Heat and Low Heat operation. Temperature rise is the difference between supply and return air temperatures.

To check temperature rise,use the following procedure:

1. Place thermometers in supply and return air registers as close to furnace as possible, avoiding direct radiant heat from heat exchangers.

1. Refer to Furnace Wiring Diagram for location of the heating and cooling speed taps located on the furnace control board as well as location of unused blower motor speed leads. Use the chart (Table 12) to determine the blower motor speed settings.

Table 12 Blower Speed Chart

Wire Color Motor Speed

* Med−High speed may not be provided on all models.

Specifications are subject to change without notice.

Black High

Orange* Med−High

Blue Medium Red Low

440 01 2024 04

Page 45

2. Change the heat or cool blower motor speed by removing the

motor lead from the “HI HEAT or LO HEAT” or “COOL” terminal and replace it with the desired motor speed lead from the “M1” or “M2” location. Connect the wire previously removed from the “HI HEAT or LO HEAT” or “COOL” terminal to the vacated “M1” or “M2” terminal.

3. If the same speed must be used for both heating and cooling,

remove the undesired motor speed lead from the “HI HEAT or LO HEAT” or “Cool” terminal and connect that lead to the open terminal at “M1” or “M2” location or tape off. Attach a jumper between the “HI HEAT or LO HEAT” and “Cool” terminals and the remaining motor speed lead.

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

Continuous-Fan using “G”

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

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

Hard-Wired Continuous Fan

A terminal is provided on the furnace control board located in the circulating air blower compartment for operation of the continuous fan option. This connection is intended for the low speed motor tap, and has a lower contact rating (8 amps) than the heat and cool taps. When the low speed blower lead is connected to this terminal, it will provide low speed blower operation whenever the other three speeds (“HI HEAT or LO HEAT” or COOL) are not energized.

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

Separate Speed Selections for Low Heat, High Heat, Cool, and Continuous-Fan

Connect low speed lead from circulating air motor to the “CONT” terminal at the furnace control board. The appropriate motor leads should already be connected to the “HI HEAT and LO HEAT” and “COOL” terminals.

Heating and Continuous-Fan Speed the Same

If it is necessary to operate the Low Heat speed and continuous−fan speed using the same blower speed, connect a jumper between the “LO HEAT” and “CONT FAN” terminals on the furnace control board.

Note: There should be only ONE motor lead going to the “LO HEAT” and “CONT FAN” terminals.

Blower Adjustments (*9MPV, *9MVX)

Changing Blower Speed

ELECTRICAL SHOCK HAZARD

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

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

NOTE: The blower speeds that the manufacturer sets from the

factory for this product are based on a nominal 400 CFM (189 L/s) per ton cooling and the mid range on the temperature rise for heating.

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

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

1. The 115 VAC power supply to the furnace must be turned OFF before making adjustments to the motor.

NOTE: Allow at least 1 minute before restoring power to the furnace after making Blower Control changes.

2. The heating, cooling and continuous blower speeds can be adjusted by changing the SW2 DIP switch settings that are located on the Tap Select Interface Board (see Figure 48).

* Switches #1 and #2 adjust the continuous blower speeds.

Switches #3 and #4 adjust the heating speed. Switches #5 and #6 adjust the cooling speed.

Switches #7 and #8 adjust the cooling speed on/off delay profiles. See the “Technical Support Manual” for the switch settings for the desired airflow rates for the installation.

The jumper J1 is used to slightly increase (+) or decrease (−) or not change (NOM) the blower speed selected from SW2. J1 effects BOTH cooling and heating airflow.

* To set continuous blower to run in high cooling speed for all

low cooling (Y1) calls, DIP switch settings #1 to 1=ON and #2 to 0=OFF or DIP switches #1 to 1=ON and #2 to 1=ON.

* To set continuous blower to operate normally in low cooling

(Y1), DIP switch settings #1 to 0=OFF and #2 to 0=OFF or #1 to 0=OFF and #2 to 1=ON.

Continuous-Fan using “G”

Energizing the ”G” terminal on the furnace control board provides continuous fan operation. This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control board. When the FAN switch is turned from auto to ON the fan will operate continuously at airflow selected by DIP SW2 switch #1 and DIP SW2 switch #2. EAC will be energized in this mode.

NOTE: In heating, the fan will not turn off during furnace ignition and warm up.

WARNING

440 01 2024 04

Hard Wired Continuous Fan Operation

Not available for variable speed models.

Specifications are subject to change without notice.

Page 46

Figure 48

ON = 1

1 8

OFF = 0

Variable Speed (*9MPV, *9MVX) Tap Select Interface Board (TSIB)

Furnace Maintenance

FIRE, EXPLOSION, OR CARBON MONOXIDE HAZARDS

Failure to have the furnace inspected and maintained could result in personal injury, death, and/or property damage.

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

See “User’s Information Manual”.

WARNING

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

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

• Before servicing, disconnect all electrical power to furnace.

• When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

WARNING

Specifications are subject to change without notice.

440 01 2024 04

Page 47

Sequence of Operation & Diagnostics (*9MPT)

The following is the normal operating sequence at factory default settings (SW1 OFF/ON/OFF)

Cooling (Y) Request:

24VAC signals applied to Y/Y2 & G terminals of FCB (furnace control board).

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

Y/Y2 & G signals removed from FCB

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

NOTE: DEHUM not available on the *9MPT models.

Continuous Circulating Fan (G) Request:

24VAC signal applied to G terminal of FCB.

• Low−Heat motor speed is energized without delay.

G signal removed from FCB.

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

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

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

Continuous Circulating Fan Hard-Wired (Cont) Request:

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

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

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

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

Heating (W1) Request (single stage thermostat operation, SW1 DIP switch #3 must be in OFF position) (see furnace wiring diagram):

24VAC signal applied to W1 terminal of FCB.

• Inducer motor turns on at high speed.

• Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins a 17 second warm up.

• The gas valve is energized, the main burners light at Low Heat rate and flame is sensed.

• The ignitor is de−energized, and the inducer drops to low speed after the main burners ignite.

• The FCB will delay Low Heat blower operation for the 45−second Low Heat Fan On Delay time, timed from

the opening of the gas valve.

• If the W1 request is still present after 12 minutes, timed from the opening of the gas valve, the inducer switches to high speed,

closing the high pressure switch, then the High Heat solenoid energizes, and the fan switches to High Heat speed.

W1 signal removed from FCB.

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

• The inducer runs at its present speed for a 15 second postpurge period.

• The fan runs at its present speed.

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

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

Heating Request (W1 & W2) (two-stage thermostat operation, SW1 DIP switch #3 must be in ON position) (see furnace wiring diagram):

24VAC signal applied to W1 terminal of FCB.

• Same response as single stage thermostat operation (fan uses Low Stage Heat On Delay) described above except the control

will not go to High Heat rate, and High Heat Fan speed unless a W2 signal is applied.

24VAC signal applied to W1 and W2 terminals of FCB.

• Same light−off routine as described for the signal stage thermostat operation except main burners light at High Heat rate, the

inducer remains on high speed after ignition, and the FCB will delay blower operation at the High Heat Fan speed for 30 second On Delay time.

NOTE 5) The FCB responds without delay to the presence or loss of W2 (with W1 constant). W1 & W2 result in high inducer, High Heat rate, and High Heat Fan speed. W1 only results in low inducer, Low Heat rate, and Low Heat Fan speed.

440 01 2024 04

Specifications are subject to change without notice.

Page 48

Heating Request with Gas Shut Off:

24 VAC signal applied to W1 terminal of FCB. The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call remains. Power reset will clear lockout.

• Inducer motor turns on at high speed.

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

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

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

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

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

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

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

• The ignitor glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout. Stops flashing

error code 6, and begins flashing error code 6 + 1.

· The inducer motor de−energizes after a 15 second post purge.

Furnace Control Board Diagnostic Codes (See Figure 49):

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

NOTE: The 6 + 1 designation indicates a combination of flash codes.

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

* Proper flame sense microamps: 0.7 microamps D.C. minimum,

2.0 − 4.0 microamps nominal

Figure 49

DIP Switch See “Wiring Diagram” for switch settings

24 VAC HUM

Control Board

Diagnostic Light

115 VAC HUM

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

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

25−24−74

Specifications are subject to change without notice.

FUSE

EAC

DEHUM

440 01 2024 04

Page 49

Wiring Diagram *9MPT (Two−Stage Heating with PSC Motor)

440 01 2024 04

Specifications are subject to change without notice.

Page 50

Sequence of Operation & Diagnostics (*9MPV, *9MVX)

The following is the normal operating sequence at factory default settings (SW1 OFF/ON/OFF, SW2 all OFF) NOTE: SW1 DIP switches (G, Y/Y2, W1, W2 thermostat terminals) and DEHUM (1/4” male quick connect terminal) are located on the

FCB. SW2 DIP switches and Y1 and O thermostat terminals are located on the TSIB.

Low Cooling (Y1) Request:

24VAC signals applied to Y1 & G terminals of TSIB (Tap Select Interface Board) and FCB (Furnace Control Board), respectively.

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

Y1 & G signals removed from TSIB and FCB

• Low Cooling motor speed is de−energized after 90 second Cool Fan Off Delay time.

Cooling (Y1) and dehumidification (DEHUM) requests:

• 24 VAC signals applied to Y1, DEHUM & G terminals of TSIB and FCB.

• Same operation as the cooling (Y1) request, except the cooling airflow is reduced 20% to compensate for high

humidity conditions during cooling operation. The low cooling airflow returns to the normal setting after the DEHUM signal is removed.

High Cooling (Y1 & Y/Y2) or (Y/Y2) Request:

24VAC signals applied to Y1 & Y/Y2 & G or Y/Y2 & G terminals of FCB (Furnace Control Board).

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

Y1 & Y/Y2 & G or Y/Y2 & G signals removed from TSIB and FCB

• High Cooling motor speed is de−energized after 90 second Cool Fan Off Delay time.

High Cooling (Y1 & Y/Y2 or Y/Y2) and dehumidification (DEHUM) requests:

• 24 VAC signals applied to Y1 & Y/Y2 or Y/Y2, DEHUM, & G terminals of TSIB and FCB.

• Same operation as the high cooling (Y1 & Y/Y2 or Y/Y2) request, except the cooling airflow is reduced 20% to compensate for high

humidity conditions during cooling operation. The high cooling airflow returns to the normal setting after the DEHUM signal is removed.

Low or high cooling and O terminal (Heat Pump mode):

• If the J2 jumper is in the AC/HP EFFICIENCY position, there will be no change in blower airflow regardless of the O terminal being

energized or de−energized.

• If the J2 jumper is in the HP COMFORT position, then there will be a 10% reduction in airflow when the O terminal is de−energized

(HP heating) and no airflow reduction when O is energized (HP cooling).

NOTE 1) The motor has been set up to recognize the O terminal as energized during cooling calls (reversing valve energized for cooling).

Continuous Circulating Fan (G) Request:

24VAC signal applied to G terminal of FCB.

• Continuous fan speed is energized without delay.

G signal removed from FCB.

• Continuous fan speed is de−energized after 5 second delay.

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

NOTE 3) Hard−wire option not available for variable speed models. NOTE 4) Continuous blower selection DIP 10 and 11 will cause the blower to run in high cooling speed for all low cooling (Y1) calls. Continuous blower DIP settings of 00 and 01 will allow low cooling (Y1) calls to operate normally.

Heating (W1) Request (single stage thermostat operation, SW1 DIP switch #3 on the FCB must be in OFF position) (see furnace wiring diagram):

24VAC signal applied to W1 terminal of FCB.

• Inducer motor turns on at high speed.

• Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins a 17 second warm up.

• The gas valve is energized, the main burners light at Low Heat rate.

• The ignitor is de−energized, and the inducer drops to low speed after the main burners ignite.

• The FCB will delay Low Heat blower operation for the 45−second Low Heat Fan On Delay time timed from the opening of the gas

valve.

• If the W1 request is still present after 12 minutes, timed from the opening of the gas valve, the inducer switches to high speed,

closing the high pressure switch, then the High Heat solenoid energizes, and the fan switches to High Heat speed.

W1 signal removed from FCB.

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

• The inducer runs at its present speed for a 15 second postpurge period.

Specifications are subject to change without notice.

440 01 2024 04

Page 51

• The fan runs at its present speed.

• The blower de−energizes after the selected Heat Fan Off Delay time expires timed from the gas valve de−energizing.

NOTE 5) If a new Heating request arrives while the control is waiting for the Heat Fan Off Delay time to expire, the FCB will wait for the selected Heat Fan Off Delay, and then start a new heating cycle.

Heating (W1 & W2) Request (two-stage thermostat operation, SW1 DIP switch #3 must be in ON position) (see furnace wiring diagram):

24VAC signals applied to W1 terminal of FCB.

• Same response as single stage thermostat operation described above except the burners, inducer, and blower will not go to high

heat rate, and High Heat Fan speed unless a W2 signal is applied.

24VAC signal applied to W1 and W2 terminals of FCB.

• Same light−off routine as described for the signal stage thermostat operation except burners light at High Heat rate, the inducer

remains on high speed after ignition, and the FCB will delay High Heat blower operation for the 30−second High Heat Fan On Delay.

NOTE 6) The FCB responds without delay to the presence or loss of W2 (with W1 constant). W1 & W2 result in high inducer, High Heat rate, and High Heat Fan speed. W1 only results in low speed inducer, Low Heat rate, and Low Heat Fan speed.

Heating Request with Gas Shut Off:

24 VAC signals applied to W1 terminal of FCB. The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call remains. Power reset will clear lockout.

• Inducer motor turns on at high speed.

• Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins warm up.

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

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

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

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

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

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

• The ignitor glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout. Stops flashing

error code 6, and begins flashing error code 6 + 1.

• The inducer motor de−energizes 15 seconds after error code 6 + 1 starts flashing.

Furnace Control Board Diagnostic Codes (See Figure 49):

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

(roll−out switch requires manual reset) 8 Flashes = Permanent Lockout − Gas valve relay contact stuck closed or miswired gas valve (power reset only) 9 Flashes = High pressure switch open when should be closed 10 Flashes = Improper transformer phasing on twinned applications or improper line voltage polarity. * If status code recall is needed, briefly (2−3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored

status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared after 72 hours or upon power reset. * Proper flame sense microamps: 0.7 microamps D.C. minimum, 2.0 − 4.0 microamps nominal

NOTE 7) Continuous blower selection DIP 10 and 11 will cause the blower to run in high cooling speed for all low cooling (Y1) calls. Continuous blower DIP settings of 00 and 01 will allow low cooling (Y1) calls to operate normally.

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

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

440 01 2024 04

Specifications are subject to change without notice.

Page 52

Wiring Diagram *9MPV, *9MVX (Variable Speed Blower Motor)

Specifications are subject to change without notice.

440 01 2024 04

Page 53

Thermostat Wiring Guide

1. These diagrams are for reference. See thermostat wiring instructions for specific terminal assignments, connections or operation.

2. Humidifier/humidistat is optional and not included with the furnace.

3. Dehumidify feature (MPV & MVX models only) requires thermostat with DEHUM feature or a separate dehumidistat to get the dehumidification operation. Dehumidistat is optional and not included with the furnace.

4. Underlined terminal indicates intended use for multiple function terminals.

5. TSIB terminals only available on MPV & MVX models.

6. Two--stage Air Conditioning or two--stage Heat Pump capability only available with MPV & MVX models.

7. W2 furnace operation is from furnace control algorithm SW1 DIP switch #3 (TT) set to OFF. Furnace runs in Low Heat for 12 minutes then switches to High Heat if heating call still exists.

8. 24V HUM terminal on furnace control is used to power

a humidifier (on call for heat and pressure switch closed) if no HUM thermostat option is available.

9. DEHUM provides a 20% reduction in airflow (when Y1 or Y1 + Y2 is energized) when the furnace control DE- HUM terminal is energized with 24V.

10. If no DEHUM thermostat option is available, a dehumidistat that has closed contacts on a call for dehumidify may be used

11. O provides a 10% reduction in airflow when Y1 or Y1 + Y2 is energized and O is NOT energized. (J2 jumper on TSIB must be in HP COMFORT position to get this function. AC/HP EFFICIENCY position results in no reduction of airflow for Y1 or Y1 + Y2 calls regardless of O being energized or not.)

12. For Heat Pump/Furnace systems, refer to Fossil Fuel Kit or Dual Fuel Thermostat Installation Instructions for wiring.

Figure 50

HUM and DEHUM Terminal available from Thermostat. Humidifier Wiring (*9MPT, *9MPV, *9MVX) Models and Dehumidify Wiring (*9MPV & *9MVX Models only)

SINGLE-STAGE

THERMOSTAT

Y G R

DEHUM

C COM

HUM

NO CONNECTION

TWO-STAGE or VS

NOTE 3, 9, 10

TSIB

NOTE 11

FURNACE CONTROL

NOTE 7

Y/Y2

DEHUM

24V HUM

NOTE 5

SINGLE-STAGE

AIR CONDITIONER

OPTIONAL

HUMIDIFIER

24V in

440 01 2024 04

Specifications are subject to change without notice.

COM

NOTE 2

Page 54

Figure 51

No HUM and/or DEHUM Terminal available from thermostat. Humidifier Wiring (*9MPT, *9MPV, *9MVX) Dehumidify wiring (*9MPV & *9MVX Models only)

OPTIONAL

DEHUMIDISTAT

(*MPV & *MVX

(*MPV Models Only)

Models Only)

Connect 1 to Y/Y2 for

1-stage AC/ HP

applications

NO CONNECTION

SINGLE-STAGE

THERMOSTAT

NOTE 3

C COM

TSIB

TWO-STAGE or VS

NOTE 5

NOTE 11

FURNACE CONTROL

NOTE 7

Y/Y2

DEHUM

24V HUM

SINGLE-STAGE

AIR CONDITIONER

Figure 52

OPTIONAL

HUMIDISTAT

H-STAT

NOTE 2

OPTIONAL

HUMIDIFIER

24V in

COM

NOTE 2

Single--Stage Thermostat with Two--Stage or Variable Speed Furnace (*9MPT , *9MPV, *9MVX) and Single--Stage Air Conditioner

OPTIONAL

DEHUMIDISTAT

(*MPV & *MVX

(*MPV Models Only)

Models Only)

Connect 1 to Y/Y2 for

1-stage AC/ HP

applications

NO CONNECTION

(HP may use O)

SINGLE-STAGE

THERMOSTAT

NOTE 3

C COM

TSIB

TWO-STAGE or VS

NOTE 5

NOTE 11

FURNACE CONTROL

NOTE 7

Y/Y2

DEHUM

24V HUM

SINGLE-STAGE

AIR CONDITIONER

OPTIONAL

HUMIDISTAT

H-STAT

NOTE 2

Specifications are subject to change without notice.

OPTIONAL

HUMIDIFIER

24V in

COM

NOTE 2

440 01 2024 04

Page 55

Figure 53

Two--Stage Thermostat with Two--Stage Furnace or Variable Speed Furnace (*9MPT, *9MPV, *9MVX Models) and Single--Stage Air Conditioner

TWO-STAGE

THERMOSTAT

TSIB

NOTE 5

OPTIONAL

DEHUMIDISTAT

(*MPV & *MVX

Models Only)

(*MPV Models Only)

If no DEHUM from

thermostat available

Connect 1 to Y1 for 2-

stage AC-HP

applications.

Connect 1 to Y/Y2 for

1-stage AC- HP

applications

DEHUM

HUM

NOTE 3, 9, 10

NOTE 11

VS FURNACE

CONTROL

NOTE 7

Y/Y2

DEHUM

COM

24V HUM

SINGLE STAGE

AIR CONDITIONER

OPTIONAL

HUMIDIFIER

24V in

COM

NOTE 2

Figure 54

Two--Stage Thermostat with Variable Speed Furnace (*9MPV & *9MVX Models only) and Two--Stage Air Conditioner

OPTIONAL

DEHUMIDISTAT

(*MPV & *MVX

Models Only)

(*MPV Models Only)

If no DEHUM from

thermostat available

Connect 1 to Y1 for 2-

stage AC-HP

applications.

Connect 1 to Y/Y2 for

1-stage AC- HP

applications

TWO-STAGE

THERMOSTAT

DEHUM

NOTE 3, 9, 10

TSIB

NOTE 5

NOTE 11

VS FURNACE

CONTROL

Y/Y2

DEHUM

COM

24V HUM

TWO-STAGE

AIR CONDITIONER

OPTIONAL

HUMIDIFIER

440 01 2024 04

HUM

International Comfort Products, LLC

Lewisburg, Tennessee 37091 USA

Specifications are subject to change without notice.

24V in

COM

NOTE 2

International comfort products C9MVX, H9MPV, C9MPV, T9MPV, C9MPT Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual