Nordyne M4RC User manual

GAS FURNACES 92.1% AFUE

Single Stage Condensing Gas Furnaces

iVl4RC Upflow Furnace iVl4RL Downflow Furnace

PROPOSiTiON 65 WARNING: This product

contains chemicals known to the state of

California to cause cancer, birth defects or

other reproductive harm.

ATTENTION INSTALLERS:

It is your responsibility to know this product better than your

customer. This includes being able to install the product

according to strict safety guidelines and instructing the

customer on how to operate and maintain the equipment for

the life of the product. Safety should always be the deciding

factor when installing this product and using common sense

plays an important role as well. Pay attention to all safety

warnings and any other special notes highlighted in the

manual, improper installation of the furnace or failure to

follow safety warnings could result in serious injury, death,

or property damage.

These instructions are primarily intended to assist qualified

individuals experienced in the proper installation of this

appliance. Some local codes require licensed installation/

service personnel for this type of equipment. Please read all

instructions carefully before starting the installation. Return

these instructions to the customer's package for future

reference,

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly

could result in serious injury or property

damage.

=installation and service must be performed

by a qualified installer, service agency or

the gas supplier.

=Do not store or use gasoline or other

flammable vapors and liquids in the

vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

=Do not try to light any appliance.

=Do not touch any electrical switch; do not

use any phone in your building.

=Leave the building immediately.

=immediately call your gas supplier from a

neighbors phone. Follow the gas suppliers

instructions.

=if you cannot reach your gas supplier, call

the fire department.

TABLE OF CONTENTS

SAFETY INFORMATION ............................................. 3

REQUIREMENTS AND CODES .................................. 4

GENERAL INSTRUCTIONS ........................................ 5

Manufacturer Warranty ............................................ 5

Combustion Air Quality ............................................ 5

Installation in a Garage ............................................ 5

Heating Load ........................................................... 6

Clearances to Combustible Materials ...................... 6

COMBUSTION AiR REQUIREMENTS ........................ 6

General information................................................. 6

Installation in Confined Spaces ............................... 7

Air From inside.................................................... 7

Outdoor Air from a Crawl Space or

Vented Attic ......................................................... 7

Outdoor Air Using Vertical Ducts ........................ 7

Outdoor Air Using Horizontal Ducts .................... 7

Air Directly Through an Exterior Wall ................. 8

Alternate Method of Providing air from

Outside ............................................................... 8

Installation in Unconfined Spaces ........................... 8

VENTING REQUIREMENTS ...................................... 10

Vent Pipe Length and Diameter ............................. 10

Vent Pipe Material ................................................. 11

Vent Pipe Installation ............................................. 11

Outdoor Terminations -Horizontal Venting ............ 11

Outdoor Terminations -Vertical Venting ................. 12

Vent Freezing Protection ....................................... 12

Condensate Disposal ............................................ 13

Concentric Vent Termination .................................. 13

Existing Installations .............................................. 13

CIRCULATING AIR REQUIREMENTS ...................... 14

Plenums and Air Ducts .......................................... 14

Return Air Connections ......................................... 14

Supply Air Connections ......................................... 15

Acoustical Treatments ............................................ 15

FURNACE INSTALLATION ....................................... 15

General Requirements .......................................... 15

Requirements and Codes ..................................... 15

Upflow Furnace Installation .................................. 16

Downfiow Furnace Installation .............................. 16

Alternate Attachment Method ........................... 18

Bottom Panel Removal .......................................... 19

Alternate Bottom Panel Removal ...................... 19

Pressure Switch Relocation .................................. 19

Inducer Assembly Rotation ................................... 20

Direct Vent (2 -Pipe) Applications ......................... 20

Vent and Inducer Assembly Options ..................... 20

Accessories .......................................................... 21

Finish Flange .................................................... 21

Rubber Grommets ............................................ 21

Inline Drain Assembly ....................................... 21

PVC TEE, Reducer, and Hose Barbs ............... 21

Condensate Drain Lines ................................... 22

Filter Retainer Brackets .................................... 22

Ventilaire TM Bracket ........................................... 22

Vent Couplings .................................................. 23

Upflow Furnaces ........................................... 23

Downfiow Furnaces ....................................... 23

Alternate Vent Pipe Installation ............................. 23

GAS SUPPLY AND PIPING ....................................... 24

Leak Check .......................................................... 24

High-Altitude Application ....................................... 24

Conversion to LP/Propane .................................... 25

ELECTRICAL WIRING ............................................... 29

Low Voltage Wiring ................................................ 29

Line Voltage Wiring ................................................ 29

Grounding ............................................................. 29

Twinning ................................................................ 30

START-UP & ADJUSTMENTS ................................... 31

Pre-Start Checklist ................................................ 31

Start-Up Procedures ............................................. 31

Verifying and Adjusting Input Rate ........................ 31

Verifying and Adjusting Temperature Rise ............ 31

Verifying Burner Operation .................................... 31

Verifying Operation of the supply Air

Limit Switch ........................................................... 32

OPERATING SEQUENCE ......................................... 32

Heating Cycle ........................................................ 32

Cooling Cycle ........................................................ 32

Fan Mode .............................................................. 32

MAINTENANCE ......................................................... 32

Air Filters ............................................................... 33

Blower Compartment ............................................ 33

Cleaning of Burners .............................................. 33

Heat Exchanger and Burner Maintenance ............ 33

Lubrication ............................................................ 33

Vent System .......................................................... 33

DESCRIPTION OF COMPONENTS .......................... 34

TROUBLESHOOTING ............................................... 34

FRENCHTRANSLATIONS ........................................ 35

FIGURES AND TABLES ............................................ 37

Figure 40 -Furnace Dimensions ....................... 37

Table 8 -Blower Performance Chart .................. 38

Electrical Information .............................................. 39

Figure 41 - Wiring Diagram ................................ 39

Gas Information ...................................................... 40

Table 9 -Gas Flow Rates ................................... 40

Table 10 -Gas Pipe Capacities .......................... 40

Table 11 -High Altitude Deration Chart for

Propane Gas ..................................... 41

Table 12 -Natural Gas Heating Values .............. 41

Table 13 -High Altitude Deration Chart for

Nat. Gas -High Heating Values .........42

Table 14 -High Altitude Deration Chart for

Nat. Gas -Low Heating Values .......... 42

Venting Information ................................................. 43

Table 15 -Vent Termination Clearances ............. 43

Figure 42 -Horizontal and Vertical Venting ........ 44

Figure 43 -Upflow Options ................................. 45

Figure 44 -Downflow Options ............................ 46

Location of Furnace Components .......................... 47

Figure 45 -Upflow/Horizontal Gas Furnace

Components ..................................... 47

Figure 46 -Downflow Gas Furnace

Components .................................... 47

INSTALLATION/PERFORMANCE CHECKLIST ........ 48

SAFETY INFORMATION

Safety markings are used frequently throughout this

manual to designate adegree or level of seriousness and

should not be ignored. WARNING indicates a potentially

hazardous situation that if not avoided, could result in

personal injury or death. CAUTION indicates a potentially

hazardous situation that if not avoided, may result in minor

or moderate injury or property damage.

WARNING:

The safety information listed below must be

followed during the installation, service, and

operation of this furnace. Failure to follow safety

recommendations could result in possible

damage to the equipment, serious personal

injury or death.

Use only with type of gas approved for this furnace.

Refer to the furnace rating plate.

Install this furnace in accordance to the minimum

clearances to combustible materials listed in Table 1

(page 9).

Provide adequate combustion and ventilation air to the

furnace space as specified on pages 6 -9.

Provide adequate clearances around thevent air intake

terminal as specified in Figures 6 -9 (pages 12 -13).

Combustion products must be discharged outdoors.

Connect this furnace to an approved vent system only,

as specified on Pages 10 -13.

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

commercially available soap solution to check all

connections (page 24).

This furnace is designed to operate with a maximum

external pressure rise of 0.5 inches of water column.

Consult Table 8 (page 38), and the rating plate for the

proper circulating air flow and temperature rise.

NOTE: It is important that the duct system be designed

to handle the desired flow rate and external pressure

rise. An improperly designed duct system can result

in nuisance shutdowns, and comfort or noise issues.

When supply ducts carry air circulated by the furnace

to areas outside the space containing the furnace, the

return air shall also be handled by duct(s) sealed to

the furnace casing and terminating outside the space

containing the furnace. See page 14.

This furnace may not be used for temporary heating

of buildings or structures under construction.

REQUIREMENTSandCODES

This furnace must be installed in accordance with

these instructions, all applicable local building codes

and the current revision of the National Fuel Gas Code

(NFPA54/ANSI Z223.1) orthe Natural Gas and Propane

Installation Code, CAN/CGA B149.1.

CE g_n6rateur d'air chaud dolt _tre installe conformement

aux instructions du fabricant et aux codes Iocaux. En

I'absence de code local, respecter la norme ANSI Z223., 1,

institule National Fuel Gas Code ou les codes d'installation

CAN/GCA-B149.

The Commonwealth of Massachusetts requires

compliance with regulation 248 CMR 4.00 and 5.00 for

installation of through - the - wall vented gas appliances

as follows:

.For direct-vent appliances, mechanical-vent heating

appliances or domestic hot water equipment, where

the bottom of the vent terminal and the air intake is

installed below four feet above grade the following

requirements must be satisfied:

a.) A carbon monoxide (CO) detector and alarm shall be

placed on each floor levelwherethere are bedrooms.

The detector shall comply with NFPA 720 (2005

Edition) and be mounted in the living area outside

the bedroom(s).

b.) A (CO) detector shall be located in the room that

houses the appliance or equipment and shall:

Be powered by the same electrical circuit as

the appliance or equipment. Only one service

switch shall power the appliance and the (CO)

detector;

Have battery back-up power;

Meet ANSl/UL 2034 Standards and comply with

NFPA720 (2005 Edition); and Approved and listed

by a Nationally Recognized Testing Laboratory as

recognized under 527 CMR.

c.) A Product-approved vent terminal must be used,

and ifapplicable, a product-approved air intake must

be used. Installation shall be in strict compliance

with the manufacturer's instructions. A copy of

the installation instructions shall remain with the

appliance or equipment at the completion of the

installation.

d.) A metal or plastic identification plate shall be mounted

atthe exterior ofthe building, four feet directly above

the location of vent terminal. The plate shall be of

sufficient size, easily read from a distance of eight

feet away, and read "Gas Vent Directly Below".

.For direct-vent appliances, mechanical-vent heating

appliances or domestic hot water equipment where

the bottom of the vent terminal and the air intake is

installed above four feet above grade the following

requirements must be satisfied:

a.) A (CO) detector and alarm shall be placed on

each floor level where there are bedrooms. The

detector shall comply with NFPA 720 (2005 Edition)

and be mounted in the living area outside the

bedroom(s).

b.) The (CO) detector shall:

Be located in the room that houses the appliance

or equipment;

Be hard-wired or battery powered or both.

Shall comply with NFPA 720 (2005 Edition).

c.) A product-approved vent terminal must be used,

and ifapplicable, a product-approved air intake must

be used. Installation shall be in strict compliance

with the manufacturer's instructions. A copy of

the installation instructions shall remain with the

appliance or equipment at the completion of the

installation.

Additional information listed below is for reference

purposes only and does not necessarily have jurisdiction

over local or state codes. Always consult with local

authorities before installing any gas appliance.

Combustion and Ventilation Air

= US: National Fuel Gas Code (NFGC), AirforCombustion

and Ventilation

CANADA: Natural Gas and Propane Installation Codes

(NSCNGPIC), Venting Systems and Air Supply for

Appliances

Duct Systems

US and CANADA: Air Conditioning Contractors

Association (ACCA) Manual D, Sheet Metal and

Air Conditioning Contractors National Association

(SMACNA), or American Society of Heating,

Refrigeration, and Air Conditioning Engineers

(ASHRAE) Fundamentals Handbook

Electrical Connections

US: National Electrical Code (NEC) ANSI/NFPA 70

CANADA: Canadian Electrical Code CSA C22.1

Gas Piping and Gas Pipe Pressure Testing

US: NFGC and National Plumbing Codes

CANADA: NSCNGPIC

General Installation

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

copies, contact the National Fire Protection Association

Inc., Batterymarch Park, Quincy, MA 02269;orAmerican

Gas Association, 400 N. Capitol, N.W., Washington DC

20001 or www.NFPA.org

• CANADA: NSCNGPIC. For a copy, contact Standard

Sales, CSA International, 178 Rexdale Boulevard,

Etobicoke (Toronto), Ontario, M9W 1R3 Canada

Safety

US:(NFGC)NFPA54-1999/ANSIZ223.1andthe

InstallationStandards,WarmAir Heatingand Air

ConditioningSystemsANSI/NFPA90B.

FederalManufacturedHomeConstructions&Safety

Standard(H.U.D.Title24,Part3280.707[a][2])

TheStandardfor ManufacturedHomeInstallations

(ManufacturedHomeSites,Communities,andSet-Ups)

ANSIA225.1and/orCAN/CSA-2240MHSeries).

AmericanNationalStandard(ANSI-119.2/NFPA-501C)

forallrecreationalvehicleinstallations.

CANADA:CAN/CGA-B149.1and .2-M00National

StandardofCanada.(NSCNGPIC)

GENERALINSTRUCTIONS

ManufacturerWarranty,Owner'sResponsibilities

It is the sole responsibility of the homeowner to make

certain the gas furnace has been correctly installed in

the home, converted to the proper fuel (LP gas or Natural

gas), and adjusted for proper operation,

A warranty certificate with full details is included with this

furnace. However, NORDYN Ewill not be responsible forany

costs found necessary to correct problems due to improper

setup, improper installation, furnace adjustments, improper

operating procedure on the part of the user, etc.

Some specific examples of service calls which cannot be

included in warranty payments are:

Converting the furnace to use another type of gas.

Repairing duct work in the home found to be faulty.

Correcting wiring problems in the electrical circuit

supplying the furnace.

Resetting circuit breakers, blown fuses or other

switches.

Correcting problems due to improper gas supply

pressure to the furnace.

Providing instructional training on how to light and

operate the furnace.

• Correcting any problems caused by installation ofan air

conditioner, heat pump or other air comfort devices.

Revising installation of the furnace flue assembly.

Adjusting or calibrating of thermostat.

Removing any construction debris which hasfallen into

flue system.

Carefully review these responsibilities with your

manufactured housing dealer, service company, or gas

supplier, so that there will be no misunderstanding at a

later time.

Combustion Air Quality

CAUTION'.

Combustion air must not be drawn from a

corrosive atmosphere.

To maximize heat exchanger life, the combustion air

must be free of chemicals that can form corrosive acidic

compounds in the combustion gases. The recommended

source of combustion air is to use outdoor air. However,

the use of indoor air in most applications is acceptable

except as listed:

If the furnace is a single pipe installation and installed

in a confined space, it is required that the necessary

combustion air come from the outdoors by way of attic,

crawl space, air duct, or direct opening. See pages 6 -9

for combustion air requirements.

Installations in these locations may require outdoor air

for combustion, due to chemical exposures:

Commercial buildings

Buildings with indoor pools

Furnaces installed in laundry rooms

Furnaces installed in hobby or craft rooms

Furnaces installed near chemical storage areas

Exposure to the following substances inthe combustion

air supply may require outdoor air for combustion:

Permanent wave solutions

Chlorinated waxes and cleaners

Chlorine based swimming pool chemicals

Water softening chemicals

De-icing salts or chemicals

Carbon Tetrachloride

Halogen type refrigerants

Cleaning solvents (perchloroethylene)

Printing inks, paint removers, varnishes, etc.

Hydrochloric Acid

Cements and glues

Antistatic fabric softeners

Masonry acid washing materials

installation in a Garage

WARNING:

Do not place combustible material on or against

the furnace cabinet or within 6inches of the

vent pipe, Do not place combustible materials,

including gasoline or any other flammable

vapors and liquids, in the vicinity of the furnace.

This Gas-fired furnace may be installed in a residential

garage with the provision that the burners and igniter

are located no less than 18 inches (457mm) above the

floor. The furnace must be located or protected to prevent

physical damage by vehicles.

Heating Load

This furnace should be sized to provide the design heating

load requirement. Heating load estimates can be made

using approved methods available from Air Conditioning

Contractors of America (Manual J); American Society of

Heating, Refrigerating, and Air Conditioning Engineers;

or other approved engineering methods. Excessive

oversizing of the furnace could cause the furnace

and/or vent to fail prematurely. Inaddition, the ductwork

should be appropriately sized to the capacity of the

furnace to ensure its proper airflow rating. For installations

above 2,000 ft., the furnace should have a sea level input

rating large enough that it will meet the heating load after

derafion for altitude.

Clearances to Combustible Materials

This furnace is Design Certified in the U.S. and Canada

by CSA International for the minimum clearances to

combustible material listed in Table 1 (page 9). To obtain

model number and specific clearance information, refer

to the furnace rating plate, located inside of the furnace

cabinet.

Access for positioning and servicing the unit must be

considered when locating unit. The need to provide

clearance for access to panels or doors may require

clearance distances over and above the requirements.

Allow 30 inches minimum clearance from the front

of the unit for servicing and positioning. However, 36

inches is strongly recommended.

COMBUSTION AIR REQUIREMENTS

General Information

Provisions must be made during the installation of

this furnace that provide an adequate supply of air for

combustion. NORDYNE condensing furnaces must be

installed with outdoor combustion air piped directly to

the furnace.

WARNING:

Furnace installation using methods other than

those described in the following sections must

complywith the National Fuel Gas Code (NFGC)

and all applicable local codes.

Instructions for determining the adequacy of an

installation can be found in the current revision of the

NFGC (ANSI Z223.1 /NFPA54). Consult local codes

for special requirements. These requirements are for

US installations as found in the NFGC.

Requirements in Canada (B149.1) are structured

differently. Consult with B149.1 and local code officials

for Canadian installations.

The M4 series gas furnace has been certified for use

in manufactured homes in the United States to the UL

307B standard and to ANSI Z21.47 CAN/CGA-2.3 in

Canada and the United States. These furnaces may

be installed in:

Manufactured Homes

Recreational Vehicles, Park Models

Manufactured Buildings

Modular Homes /Buildings

The M4 furnace is listed as a Direct Vent (2-pipe) forced

air furnace (type FSP) for use with both natural and

propane (LP) gases. NOTE: Direct vent appliances

draw combustion air from the outdoors and vent

combustion products back outside, isolating the entire

system from the indoor space. It is important to make

sure that the whole system is sealed and clearances

to combustibles are maintained regardless of the

installation being in a confined or unconfined space.

The combustion air from the outside needs to be clear

of chemicals that can cause corrosion. The inlet pipe

should not be placed near corrosive chemicals such

as those listed on page 5. These chemicals can cause

severe corrosion in the furnace combustion system.

Air openings on top of the furnace and in closet doors

or walls must never be restricted. If the furnace is

operated without adequate combustion air, the flame

roll-out switch will open and turn off the gas supply

to the burners. This safety device is a manually

reset switch. DO NOT install jumper wires across

these switches to defeat their function or reset a

switch without identifying and correcting the fault

condition. If a switch must be replaced, use only the

correct sized part specified in the Replacement Parts

List provided online.

CAUTION:

Exhaust fans, clothes dryers, fireplaces and

other appliances that force air from the house

to the outdoors can create a negative pressure

inside the house, resulting in improper furnace

operation or unsafe conditions such as flame roll

out. It is imperative that sufficient air exchange

with the outdoors is provided to prevent

depressurization. Additional information about

how to test for negative pressure problems can

be found in the NFGC.

Installation in Confined Spaces

A confined space is an area with volume less than 50

cubic feet per 1,000 Btuh of the combined input rates of

all appliances drawing combustion air from that space.

Furnace closets, small equipment rooms and garages are

confined spaces. Furnaces installed in a confined space

which supply heated air to areas outside the space must

draw return air from outside the space and must have the

return air ducts tightly sealed to the furnace.

The required sizing of these openings is determined by

whether inside or outside air isused to support combustion,

the method by which the air is brought to the space, and

by the total input rate of all appliances in the space. In

all cases, the minimum dimension of any combustion air

opening is 3 inches.

Air From Inside

If combustion air is taken from the heated space, the two

openings must each havea free area of at least one square

inch per 1,000 Btuh of total input of all appliances in the

confined space, but not less than 100 square inches of

free area. See Example and Figure 1.

Example:

If the combined input rate of all appliances is less than

or equal to 100,000 Btuh, each opening must have a

free area of at least 100 square inches. If the combined

input rateof all appliances is 120,000 Btuh, each opening

must have a free area of at least 120 square inches.

Vent or

NOTES:

Each opening must be

at least 100 sq. in. or E

sq. in. per 1,000 Btuh

of total input rating,

whichever is greater.

Openings must start at

no more than 12 inches

from the top and bottom

of the enclosure.

Furnace

See _F

Notes _ _

12" Max.

40,000

60,000

80,000

100,000

120,000

140,000

160,000

100 sq.

120 sq.

140 sq.

160 sq.

12inches

13inches

14inches

15inches

Figure 1. Combustion Air Drawn from Inside

Outdoor Air from a Crawl Space or Vented Attic

When the openings can freely exchange air with the

outdoors, each opening shall have a minimum free area

of 1 square inch per 4,000 Btuh of total appliance input.

The openings shall exchange directly, or by ducts, with

the outdoor spaces (crawl or attic) that freely exchange

with the outdoors. See Figure 2.

Vent or

Chimney

Louvers

(each end of attic)

NOTE: Air openings shall

each have a free area of

Furnace not less than one square

inch per 4,000 Btuh of the

Alternate, Inlet Air total input rating of all

Air Inlet /equipment in the enclosure.

Ventilation Louvers For

Unheated Crawl Space

Figure 2. Combustion Air Drawn from a Crawl

Space or Vented Attic

Outdoor Air Using Vertical Ducts

If combustion air is taken from outdoors through vertical

ducts, the openings and ducts must have a minimum free

area of one square inch per 4,000 Btuh of total appliance

input. Attics or crawl spaces must connect freely with the

outdoors if they are the source of air for combustion and

ventilation. See Figure 3.

Vent or

Ventilation Louvers

at each end of attic \Air Duct must be

sq. in.

per 4,000 Btuh of

total input rating.

urnace _att__ill !gl f

_12" Max

40,000

60,000

80,000

100,000

120,000

140,000

160,000

10 sq. In

15 sq. In

20 sq. In

25 sq. In

30 sq. In

35 sq. In

40 sq. In

4inches

5inches

6inches

7inches

8inches

Figure 3. Combustion Air Drawn from Outside

Through Vertical Ducts

Outdoor Air Using Horizontal Ducts

If combustion air istaken from outdoors through horizontal

ducts, the openings and ducts must have a minimum free

area of one square inch per 2,000 Btuh of total appliance

input. Ducts must have cross -sectional area at least as

large as the free area of their respective openings to the

furnace space. See Figure 4 (page 8). 7

\Vent (

Air Duct

Air Ducts must be

at least 1 sq. in.

per 2,000 Btuh of

total input rating.

40,000

60,000

80,000

100,000

120,000

140,000

160,000

20 sq. In

30 sq. In

40 sq. In

50 sq. In

60 sq. In

70 sq. In

80 sq. In

5 inches

6 inches

7 inches

8 inches

9 inches

10 inches

Figure 4. Combustion Air Drawn from Outside

Through Horizontal Ducts

Air Directly Through An Exterior Wall

If combustion air is provided directly through an exterior

wall, the two openings must each have free area of at

least one square inch per 4,000 Btuh of total appliance

input. See Figure 5.

Ventor__

Chimney .// ng to outside

must be at least 1 sq. in. per

4,000 Btuh of total input rating.

See--

Note sMax Water

Heater Furnace

Seei / /

Note i

12" Max=3_ i

I J

40,000

60,000

80,000

100,000

120,000

140,000

160,000

10 sq. In

15 sq. In

20 sq. In

25 sq. In

30 sq. In

35 sq. In

40 sq. In

4inches

5inches

6inches

7inches

8inches

Figure 5. Combustion Air Drawn from Outside

Through an Exterior Wall

Alternate Method of Providing Air from Outside:

Ifacceptable under local Codes, itispermitted to provide

outside air using one opening (See NFGC).

Generally, confined spaces must have two openings in

the space for combustion air.One opening must be within

12 inches of the ceiling, and the other must be within

12 inches of the floor. However, an alternative method

recently adopted by the NFGC uses one opening within

12 inches of the top of the space. This method may be

used if it is acceptable to the local codes.

The following conditions must be met:

1.The opening must start within 12" of the top of the

structure and connect with the out of doors through

vertical or horizontal ducts or be ducted to a crawl

or attic space that connects with the out of doors.

2.The opening must have a minimum free area of 1 sq.

in. per 3,000 Btu per hour of the total input rating of

all equipment located in the enclosure.

3.The free area must not be less than the sum of all the

areas of the vent connectors in the enclosure.

installation in Unconfined Spaces

An unconfined space is an area including all rooms not

separated by doors with a volume greater than 50 cubic

feet per 1,000 Btuh of the combined input rates of all

appliances which draw combustion air from that space.

In general, a furnace installed in an unconfined space will

not require outside air for combustion. However, in homes

built for energy efficiency (low air change rates), it may

be necessary to provide outside air to ensure adequate

combustion and venting, eventhough the furnace is located

in an unconfined space. See example.

Example:

A space with a water heater rated at 45,000 Btuh

input and a furnace rated at 75,000 Btuh requires a

volume of 6,000 cubic feet [50 x (45 + 75) = 6,000] to

be considered unconfined. If the space has an 8 foot

ceiling, the floor area of the space must be 750 square

feet (6,000 /8 = 750).

Left Side ................................... 0 Inches

Right Side ................................ 0 Inches

UPFLOW APPLICATION

TOP

mC3

w __

BOTTOM

Vent ............................................. 1 Inch Top ........................................... 1 Inches

Back ......................................... 0 Inches Front....................................... 4 Inches t

DOWNFLOW APPLICATION

TOP

m _

co __

w __

.-J 02

BOTTOM

tAllow 30 in. minimum clearance for servicing. Recommended clearance is 36 in.

NOTE: The furnace is listed for installation on combustible or non-combustible flooring. However, wood is the only combustible

flooring allowed for installation.

Table 1. Minimum Clearances to Combustible Materials

WARNING:

CARBON MONOXIDE POISONING HAZARD

Failureto followthe 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 with each individual appliance connected to the venting system being placed

in 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 orthe CSA B 149.1, Natural Gas and Propane Installation

Codes 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. Followthe lighting instructions. Place the appliance being inspected into operation. Adjust

the thermostat so appliance is operating continuously.

7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after

5 minutes of main burner operation. Use the flame of a match or candle.

8. if improper venting is observed during any of the above tests, the venting system must

be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or

CSA B149.1, Natural Gas and Propane Installation Codes.

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.

VENTING REQUIREMENTS

WARNING:

This furnace must not be vented with other

appliances, even if that appliance is of the

condensing type. Common venting can result

in severe corrosion of other appliances or their

venting and can allow combustion gases to

escape through such appliances or vents. Do

not vent the furnace to a fireplace chimney or

building chase.

Upon completion of the furnace installation,

carefully inspect the entire flue system both

inside and outside the furnace to assure it is

properly sealed. Leaks in the flue system can

result in serious personal injury or death due

to exposure of flue products, including carbon

monoxide.

*This furnace must be vented in compliance with

the current revision of the National Fuel Gas Code

(ANSI-Z223.1/NFPA54) and the instructions

provided below. Consult local codes for special

requirements.

* InCanada, venting shall conform to the requirements of

the current (CAN/CGA B149.1 or .2) installationcodes.

Consult local codes for special requirements.

This furnace is classified as a "Category IV" appliance,

which requires special venting materials and installation

procedures. This type of appliance operates with positive

vent pressure and therefore requires the furnace to be

vented to the outdoors and thoroughly sealed. They also

produce liquid condensate, which is slightly acidic and

can cause severe corrosion of ordinary venting materials.

Furnace operation can be adversely affected by restrictive

vent and combustion air piping.

Vent Pipe Length and Diameter

Inorder for the furnace to operate properly, the combustion

air and vent piping must not be excessively restrictive.

*The venting system should be designed to have the

minimum number of elbows or turns.

*All horizontal runs must slope upwards from the furnace

at 1/4 inch minimum per running foot of vent.

*Transition to the final vent diameter should be done as

close to the furnace outlet as practical.

*Always use the same size or a larger pipe for

combustion air that is used for the exhaust vent.

Table 2 specifies the maximum allowable pipe length

for vent and combustion air for a furnace of known input

rate, when installed with piping of selected diameter and

number of elbows.To use the table, the furnace input rate,

the centerline length and the number of elbows on each

pipe must be known.

When estimating the length of vent runs, consideration

must be made to the effect of elbows and other fittings.

This isconveniently handled using the idea of "equivalent

length". This means the fittings are assigned a linear

length that accounts for the pressure drop they will cause.

For example: a 2" diameter, long radius elbow is worth

the equivalent of 2.5 feet of linear run. A 90 degree tee

is worth 7 ft.

The equivalent lengths of tees and various elbows are

listed in Table 2. Measure the linear length of your vent

run and then add in the equivalent length of each fitting.

The total length, including the equivalent fitting lengths,

must be less than the maximum length in the table.

Furnace

54,000

72;000

90,000

FURNACE

3" Diameter I 3" Diameter

Upflow 90 90

Upflow. 90 90

Upflow 90 90

Downflow 90 90

108000 upflow j90 I 90

NOTES:

1.The length of 2" pipe needed between the inducer and the exit hole (top of cabinet) is 8 3/4" for upflow models and 16" for downflow models.

2. Subtract 2.5 ft. for each additional 2 inch long radius elbow, 5 ft. for each additional 2 inch short radius elbow, 3.5 ft. for each additional 3

inch long radius elbow, and 7 ft. for each additional 3 inch short radius elbow. Subtract 8ft for each 3" tee.

3. Two 45 degree elbows are equivalent to one 90 degree elbow.

4. This table applies for elevations from sea level to 2,000 ft. For higher elevations, decrease pipe lengths by 8% per 1,000 ft of altitude.

Table 2.Vent Pipe Lengths

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