Installation Instructions

These instructions areprimarily intended toassist qualified individualsexperienced in the properinstallation of this typeappliance. Some localcodes require licensedinstallation/servicepersonnel for this typeof equipment. Read allinstructions carefullybefore starting theinstallation.

*RA 80+ SeriesHigh Efficiency Compact Upflow/Horizontal

Residential Gas Furnaces

! WARNING:If the information in theseinstructions is not followedexactly, a fire or explosion mayresult, causing property damage,personal injury or death.

Do not store or use gasoline orother flammable vapors andliquids in the vicinity of this orany 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 inyour building.

• Immediately call your gassupplier from a neighbor'sphone. Follow the gas supplier'sinstructions.

• If you cannot reach your gassupplier, call the fire department.

• Extinguish any open flame.

FOR YOUR SAFETY! WARNING:Improper installation, adjustment,alteration, service, ormaintenance can cause injury orproperty damage. Refer to thismanual for assistance. Foradditional information consult aqualified installer, service agency,or the gas supplier.

2

3

Table of ContentsFurnace Specifications ............................................................................................................. 2

Safety Information ............................................................................................................. 4Capacities-Furnace Airflow Data ..................................................................................... 5

Installation Requirements ........................................................................................................ 6Horizontal Furnace Installation ........................................................................................ 7

Venting and Combustion Air Requirements ....................................................................... 9General ............................................................................................................................. 9Installation in an Unconfined Space ............................................................................... 10Installation in a Confined Space ..................................................................................... 10

Air From Inside ..................................................................................................... 11Outdoor Air Using Vertical Ducts ........................................................................ 11Air Directly Through an Exterior Wall .................................................................. 11Outdoor Air Using a Crawl Space and Ventilated Attic ....................................... 11Outdoor Air Using Horizontal Ducts .................................................................... 11

Venting Requirements ............................................................................................................ 11General ........................................................................................................................... 11Category I - Common Venting ....................................................................................... 12

Circulating Air Supply ............................................................................................................ 13General ........................................................................................................................... 13Return Air ........................................................................................................................ 14

Gas Supply and Piping ........................................................................................................... 14General ........................................................................................................................... 15Leak Check .................................................................................................................... 15Conversion ..................................................................................................................... 16

High Altitude Conversion ...................................................................................................... 17High Altitude Application ................................................................................................. 17Pressure Switch Conversion for High Altitude Applications ......................................... 17Natural Gas High Altitude Conversion ........................................................................... 17LP/Propane Gas Sea Level and High Altitude Conversion ........................................... 17

Electrical Wiring ....................................................................................................................... 21General ........................................................................................................................... 21Line Voltage Wiring ......................................................................................................... 21Low Voltage Wiring ......................................................................................................... 21

Start-up and Adjustments ..................................................................................................... 21General ........................................................................................................................... 21Start-up Procedures ....................................................................................................... 23Verifying and Adjusting Firing Rate ................................................................................ 23Verifying and Adjusting Temperature Rise .................................................................... 23Verifying Burner Operation ............................................................................................. 25Verifying Operation of the Supply Air Limit Switch ........................................................ 25

Wiring Diagram ........................................................................................................................ 22Description of Components .................................................................................................. 24Maintenance ............................................................................................................................. 26

Vent System ................................................................................................................... 26Air Filter(s) ...................................................................................................................... 26Lubrication ....................................................................................................................... 26Blower Compartment ...................................................................................................... 26Heat Exchanger and Burner Maintenance .................................................................... 26Cleaning of Flue Passages ............................................................................................ 27Cleaning of Burners ........................................................................................................ 27

System Operation Information ............................................................................................. 28General ........................................................................................................................... 28Sequence of Operation .................................................................................................. 28

Heating Mode ....................................................................................................... 28Cooling Mode ........................................................................................................ 29Fan Mode ............................................................................................................. 29

Furnace Fails to Operate ............................................................................................... 29Twinning .......................................................................................................................... 30

Installation/Performance Check List ..................................................................... Back Page

4

FURNACE SPECIFICATIONS - Upflow/Horizontal Models

Table 1. Furnace Dimensions and Shipping Weights

Figure 1. Unit Dimensions in Inches

Note: †Can be C or N

3-15/16

27-3/4

24-3/4

19-3/4

25-3/4

22-13/161-9/16

3-1/2

30-1/2

25-1/823

1-1/423

7/8

15

C

B

A

34-5/8

27-7/8

23

3-1/2

1-9/16

22-13/16

25-3/4

7/8

D 23

Bottom Return(Bottom Return Opening)

SAFETY INFORMATION

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

2. Install this furnace only in a location andposition as specified on Table 3 of theseinstructions.

3. Provide adequate combustion andventilation air to the furnace space asspecified on Pages 9 through 11.

4. Combustion products must be dischargedoutdoors. Connect this furnace to anapproved vent system only, as specifiedon Pages 11 through 12.

5. Never test for gas leaks with an openflame. Use a commercially available soapsolution made specifically for the detectionof leaks to check all connections, asspecified on Page 15 of these instructions.

6. Always install furnace to operate within thefurnace’s intended temperature-rise rangewith a duct system which has an externalstatic pressure within the allowable range,as specified on Table 2 of theseinstructions. See furnace rating plate.

7. When a furnace is installed so that supplyducts carry air circulated by the furnace toareas outside the space containing thefurnace, the return air shall also be handled

Model Furnace Dimensions ShippingNumber Input A B C D Flue Outlet Weight

*RA- (Btuh) (in.) (in.) (in.) (in.) (in.) (lbs)045(†)-08A 45,000 14 1/4 12 3/4 4 11 3/4 4 88

054(†)-12A 54,000 14 1/4 12 3/4 4 11 3/4 4 94

072(†)-12A 72,000 14 1/4 12 3/4 4 11 3/4 4 96

072(†)-12B 72,000 19 3/4 18 1/4 7 5/8 17 1/4 4 108

072(†)-16B 72,000 19 3/4 18 1/4 7 5/8 17 1/4 4 115

090(†)-12B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 115

090(†)-16B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 120

090(†)-20B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 130

108(†)-16B 108,000 19 3/4 18 1/4 7 5/8 17 1/4 4 125

108(†)-20B 108,000 19 3/4 18 1/4 7 5/8 17 1/4 4 130

108(†)-20C 108,000 22 1/2 21 9 20 4 135

126(†)-20C 126,000 22 1/2 21 9 20 4 137

FURNACE DIMENSIONS AND SHIPPING WEIGHTS

5

CAPACITIES — Furnace Airflow Data

Table 2. Furnace Airflow Data

* F

acto

ry S

et C

oolin

g S

peed

** F

acto

ry S

et H

eatin

g S

peed

No

tes:

1. A

irflo

w r

ates

of

1800

CF

M o

r m

ore

requ

ire t

wo

retu

rn a

ir co

nnec

tions

. D

ata

is f

or o

pera

tion

with

filt

er(s

).2.

Tem

pera

ture

ris

es i

n th

e ta

ble

are

appr

oxim

ate.

A

ctua

l te

mpe

ratu

re r

ises

may

var

y.3.

Tem

pera

ture

ris

es d

ispl

ayed

in

italic

s ar

e fo

r re

fere

nce

only

.4.

Tem

pera

ture

ris

es d

ispl

ayed

in

BO

LD

are

rat

ed t

empe

ratu

re r

ises

.

MO

TO

RH

PC

FM

R

ise

CF

M

Ris

eC

FM

R

ise

CF

M

Ris

eC

FM

R

ise

CF

M

Ris

eC

FM

R

ise

CF

M

Ris

e1/

510

0033

970

3495

035

920

3687

038

820

4177

043

700

4776

043

740

4473

045

720

4669

048

670

4964

052

620

5313

0031

1260

3212

1033

1160

3411

1035

1050

3898

040

910

441/

311

5034

1120

3510

9036

1050

3810

0040

950

4289

044

830

4879

050

780

5077

051

750

5372

055

690

5765

061

600

6613

8038

1350

3913

1040

1260

4212

1044

1150

4610

8049

1000

531/

312

2043

1190

4411

6045

1120

4710

7049

1020

5295

055

880

60

820

6480

066

780

6876

069

730

7370

076

670

7964

083

1550

3415

0035

1440

3713

6040

1280

4211

9045

1080

4997

055

1/4

1380

4113

1041

1240

4412

0044

1140

4710

9049

970

5587

061

1030

5210

3052

1010

5398

054

930

5786

062

780

6967

080

1955

2619

4527

1920

2718

9028

1845

2917

8530

1700

3116

0533

1/2

1635

3216

1533

1590

3315

7034

1550

3515

0036

1440

3713

7040

1370

4013

6540

1350

4013

4041

1305

4212

7043

1230

4411

5046

1165

4611

6046

1150

4611

3047

1110

4810

7549

1030

5197

555

1550

4215

0044

1440

4613

6048

1280

5111

9055

1080

6197

068

1/4

1380

5213

1055

1240

5812

0055

1140

5810

9064

970

6887

076

1030

6410

3064

1010

6598

067

930

7286

078

780

8567

099

1985

3319

5534

1905

3518

5536

1790

3717

0540

1630

4115

3044

1/2

1635

4116

4041

1610

4215

7542

1545

4314

9045

1430

4713

5049

1410

4714

0047

1380

4813

5549

1320

5012

9052

1240

5411

7557

1210

5511

9555

1180

5611

6057

1135

5911

0060

1060

6310

1066

2375

2823

2029

2280

3022

1530

2150

3120

8532

2015

3319

4034

3/4

1975

3319

5534

1920

3518

9535

1850

3618

0037

1740

3816

8539

1640

4016

1541

1595

4115

7542

1540

4315

0044

1460

4614

0048

1365

4913

4550

1330

5013

1551

1280

5212

4553

1225

5412

1055

1985

4019

5541

1905

4218

5543

1790

4517

0547

1630

4915

3052

1/2

1635

4916

4049

1610

5015

7551

1545

5214

9054

1430

5613

5059

1410

5714

0057

1380

5813

5559

1320

6012

9062

1240

6511

7568

1210

6611

9567

1180

6811

6069

1135

7011

0073

1060

7510

1079

2410

3223

7033

2330

3422

7535

2230

3621

6537

2075

3819

9040

3/4

2035

3919

9540

1965

4119

5541

1915

4218

9542

1815

4417

9045

16

8047

1660

4816

5049

1645

4916

4050

1565

5115

5052

1485

5414

3555

1430

5514

2556

1415

5614

0057

1350

5913

3060

1275

6222

7035

2210

3621

9036

2165

3721

3038

2100

3920

3040

1975

413/

418

8042

1865

4318

3543

1815

4417

9045

1770

4517

5546

1720

4715

6550

1550

5115

3552

1520

5215

1053

1495

5414

5555

1420

5613

2560

1320

6113

1561

1310

6112

8562

1275

6312

5064

1220

6622

7040

2210

4121

9042

2165

4321

3044

2100

4520

3046

1975

473/

418

8049

1865

5018

3551

1815

5117

9052

1770

5217

5553

1720

5415

6559

1550

6015

3561

1520

6115

1062

1495

6314

5564

1420

6613

2570

1320

7013

1571

1310

7112

8572

1275

7312

5075

1220

76

EX

TE

RN

AL

ST

AT

IC P

RE

SS

UR

E (

INC

HE

S O

F W

AT

ER

CO

LU

MN

)0.

10.

20.

30.

40.

50.

60.

70.

8M

OD

EL

N

UM

BE

RH

EA

TIN

GM

OT

OR

*RA

INP

UT

SP

EE

D04

5-08

A45

,000

HIG

H*

LOW

**05

4-12

AH

IGH

*54

,000

ME

DIU

M

LOW

**07

2-12

AH

IGH

*72

,000

ME

DIU

M

LOW

**07

2-12

BH

IGH

*72

,000

ME

DIU

M**

LOW

072-

16B

HIG

H72

,000

ME

D-H

IGH

*M

ED

-LO

W**

LOW

090-

12B

HIG

H*

90,0

00M

ED

IUM

LO

W**

090-

16B

HIG

H*

90,0

00M

ED

-HIG

H**

ME

D-L

OW

LOW

090-

20B

HIG

H*

90,0

00M

ED

-HIG

HM

ED

-LO

WLO

W**

108-

16B

HIG

H*

108,

000

ME

D-H

IGH

**M

ED

-LO

WLO

W10

8-20

BH

IGH

*10

8,00

0M

ED

-HIG

HM

ED

-LO

WLO

W**

108-

20C

HIG

H*

108,

000

ME

D-H

IGH

**M

ED

-LO

WLO

W12

6-20

CH

IGH

*12

6,00

0M

ED

-HIG

H**

ME

D-L

OW

LOW

6

by duct(s) sealed to the furnace casingand terminating outside the spacecontaining the furnace.

8. A gas-fired furnace for installation in aresidential garage must be installed asspecified on Page 9 of these instructions.

9. The furnace is not to be used for temporaryheating of buildings or structures underconstruction.

INSTALLATION REQUIREMENTS

Requirements and CodesThis furnace must be installed in accordancewith these instructions, all applicable local buildingcodes, current revision of the National FuelGas Code (ANSI-Z223.1), and in Canada withthe CAN/CGA - B149 installation code. Thecurrent revision of the National Fuel Gas Codeis available from:

American National Standards Institute,Inc.

1430 BroadwayNew York, New York 10018

Additional helpful publications are:

NFPA-90A - Installation ofAir Conditioning and Ventilating Systems

NFPA-90B - Warm Air Heatingand Air Conditioning Systems

These publications are available from:

National Fire Protection Association, Inc.Batterymarch ParkQuincy, Massachusetts 02269

! WARNING:This furnace is not approved forinstallation in mobile homes. Installationin a mobile home could cause fire,property damage, and/or personalinjury.

IMPORTANT NOTE

The Commonwealth of Massachusetts re-quires compliance with regulation 248 CMR4.00 and 5.00 for installation of through – the– wall vented gas appliances as follows:

(a) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment, where the bottom of thevent terminal and the air intake is installedbelow four feet above grade the followingrequirements must be satisfied:

1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s). Thecarbon monoxide detector shall com-ply with NFPA 720 (2005 Edition).

2. A carbon monoxide detector shall belocated in the room that houses theappliance or equipment and shall:

a. Be powered by the same electricalcircuit as the appliance or equipmentsuch that only one service switchservices both the appliance and thecarbon monoxide detector;

b. Have battery back-up power;c. Meet ANSI/UL 2034 Standards and

comply with NFPA 720 (2005 Edi-tion); and

d. Have been approved and listed by aNationally Recognized Testing Labo-ratory as recognized under 527CMR.

3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used. In-stallation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.

4. A metal or plastic identification plateshall be mounted at the exterior of thebuilding, four feet directly above thelocation of vent terminal. The plate shallbe of sufficient size to be easily readfrom a distance of eight feet away, andread “Gas Vent Directly Below”.

(b) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment where the bottom of thevent terminal and the air intake is installedabove four feet above grade the followingrequirements must be satisfied:

7

Gas Inlet

Electrical Supply

Connection

Coil Plenum

Type “B” Vent

CombustiblePlatform

Louver Door

Note: Edge or Line Contact is Permissible

Figure 2. Horizontal InstallationSuspended in Attic or Crawl Space

Figure 3. Horizontal Installationon a Platform

UPFLOW APPLICATION

RIGHTSIDE

BOTTOM

TOP

LEFTSIDE

TO

P

BO

TT

OM

SIDE

SIDE

HORIZONTAL APPLICATION

†Allow 24" minimum clearance for servicing.The recommended clearance is 36".

Table 3. Minimum Clearances to Combustible Material

INSTALLATION CLEARANCES

Vent Connector Type

Standard Single Wall Metal Vent

Type B-1 Double Wall Metal Vent

LEFT SIDE 0" 0"RIGHT SIDE 0" 0"

VENT 6" 1"BACK 0" 0"

BOTTOM 0" 0"TOP 1" 1"

FRONT 4"† 4"†

8

1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s).The carbon monoxide detector shallcomply with NFPA 720 (2005 Edition).

2. A carbon monoxide detector shall:

a. Be located in the room that housesthe appliance or equipment;

b. Be either hard-wired or battery pow-ered or both; and

c. Shall comply with NFPA 720 (2005Edition).

3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used.Installation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.

LocationThese gas furnaces are shipped ready forinstallation in the upflow, horizontal right or leftpositions. The furnace must be installed on alevel surface, located close to the vent (orchimney) and as close to the center of the airdistribution system as possible. See Table 1 foroverall dimensions to determine the requiredclearances in hallways, doorways, stairs, etc.to allow the furnace to be moved to the installationpoint. The furnace must be installed so that allelectrical components are protected from water.The furnace must be installed upstream from arefrigeration system. This furnace is not to beused for temporary heating of buildings orstructures under construction.

Horizontal Furnace InstallationThe furnace can be installed horizontally in anattic, basement, crawl space or alcove. It canbe suspended from a ceiling in a basement orutility room in either a right to left airflow or leftto right airflow. (See Figures 2 and 3.)

If the furnace is to be suspended from theceiling, it will be necessary to use steel strapsaround each end of the furnace. These strapsshould be attached to the furnace with sheetmetal screws and to the rafters with bolts. Thefurnace could also be suspended by an angleiron frame bolted to the rafters. (See Figure 2.)

Access for positioning and servicing must beconsidered when locating the unit. Refer toTable 3, Minimum Clearances to CombustibleMaterial, for clearance specifications.

Keep all insulating materials away from thelouvered door. Insulating materials may becombustible.

These furnaces may be installed directly oncombustible wood flooring or supports, if type "B-1" vent pipe is used (See Figure 3). It isrecommended for further reduction of fire hazardthat cement board or sheet metal be placedbetween the furnace and the combustible floorand extend 12 inches beyond the front of thelouvered door.

! WARNING:Furnaces installed with combustion airdrawn from a heated space whichincludes exhaust fans, fireplaces, orother devices that may produce anegative pressure should be consideredconfined space installations.

See the "venting requirements" section forventing guidelines and specifications.

Clearances to CombustiblesThis furnace is Design Certified by CSA Inter-national for the minimum clearances to combus-tible material listed in Table 3. Refer to thefurnace rating plate, located inside of the fur-nace cabinet, for the specific model number andclearance information.

Access for positioning and servicing the unitmust be considered when locating unit. Twentyfour inches is the minimum required clearancefrom the front of the unit for servicing it. Thirtyinches is the minimum required clearance fromthe front of the unit for positioning it. Thirty sixinches is the recommended clearance fromthe front of the unit. Please note that a panelor door can be located such that the minimumclearance on the rating plate is satisfied, but thatpanel or door must be removable and allow theappropriate clearance for your installation.

This furnace is certified for use on wood flooring.This furnace must not be installed directly oncarpeting, tile, or any combustible material otherthan wood flooring.

9

Total InputRating (Btu/hr)

40,000 60,000 80,000100,000120,000140,000160,000

MinimumFree Area

(Each Opening)

10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.

Round DuctDiameter

4"5"5"6"6"7"8"

Inlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.

Inlet and Outlet Ductsmust extend aboveattic insulation.

Outlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.

Ventilation Louvers ateach end of attic

AtticInsulation

12" Max

a. All Combustion Air from Ventilated Attic.

Furnace

Water Heater

Vent orChimney

Figure 5. Equipment in a Confined Space with allCombustion Air Drawn from the Outside

through Vertical Ducts

Total InputRating (Btu/hr)

40,000 60,000 80,000100,000120,000140,000160,000

Round DuctDiameter

12"12"12"12"13"14"15"

MinimumFree Area

(Each Opening)100 sq. in.100 sq. in.100 sq. in.100 sq. in.120 sq. in.140 sq. in.160 sq. in.

Furnace

Openings toadjacent space.Each opening mustbe at least 100 sq. in.or 1 sq. in. per 1000Btuh of total inputrating, whichever isgreater. See minimumarea per table.

12" Max.

12" Max.

Water Heater

Vent orChimney

Figure 4. Equipment in a Confined Space with allCombustion Air Drawn from the Inside

Figure 6. Equipment in a Confined Space with allCombustion Air Drawn from the Outside through

Exterior Wall

Each openingto outsidemust be at least1 sq. in. per 4000 Btuh of total inputrating.

12" Max

12" Max

Total InputRating (Btuh)

40,000 60,000 80,000100,000120,000140,000160,000

MinimumFree Area

(Each Opening)

10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.

Round DuctDiameter

4" 5" 5" 6" 6" 7" 8"

---------

---------

Furnace

Water Heater

Vent orChimney

VENTING AND COMBUSTIONAIR REQUIREMENTSGeneralProvisions must be made in the installation of thisfurnace to provide an adequate supply of air forcombustion. Detailed instructions for determiningthe adequacy of an installation can be found in thecurrent revision of the National Fuel Gas Code(ANSI Z223.1 / NFPA54) or in applicable localbuilding codes. Consult local codes for specialrequirements. For Canadian installationsconsult Canadian Installations Codes and (CAN/CGA B149.1 or .2).

A gas-fired furnace installed in a residentialgarage must be installed so the burners and theigniter are located not less than 18 inches (457mm) above the floor, and the furnace must belocated or protected to avoid physical damageby vehicles.

! WARNING:Do not place combustible material on oragainst the furnace cabinet or within 6inches of the vent pipe (for B-vent use therecommended clearance). Do not placecombustible materials, including gasolineand any other flammable vapors andliquids, in the vicinity of the furnace.

If the furnace is operated with inadequate air forcombustion one of the flame roll-out switcheslocated in the burner compartment or the ventswitch will open, turning off the gas supply to theburners. These safety devices are manuallyreset switches. DO NOT install jumper wiresacross these switches to defeat their function.DO NOT reset a switch without identifying andcorrecting the fault condition. If a switch must bereplaced, use only the correct part specified inthe Replacement Parts List.

10

Figure 7. Equipment in a Confined Space with AllCombustion Air Drawn from a Crawl Space

and Ventilated Attic

Outlet Air Ductmust be at least1 sq. in. per 4000 Btuh of total inputrating. Must extend above attic insulation.

Ventilation Louvers ateach end of attic

Attic Insulation

Ventilation Louvers forunheated crawl space Crawl Space

Inlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.

Furnace

Water Heater

Vent orChimney

Figure 8. Equipment in a Confined Space with allCombustion Air Drawn from the Outside through

Horizontal Ducts

Each openingto outsidemust be at least1 sq. in. per 2000 Btuh of total inputrating.

12" Max

12" Max

Total InputRating (Btu/hr)

40,000 60,000 80,000100,000120,000140,000160,000

MinimumFree Area

(Each Opening)

20 sq. in.30 sq. in.40 sq. in.50 sq. in.60 sq. in.70 sq. in.80 sq. in.

Round DuctDiameter

5" 6" 7" 8" 9"10"10"

---------

---------

Furnace

Air Duct

Air Duct

Water Heater

Vent orChimney

---------

---------

Air openings in the furnace door, supply airregisters, and return air grilles must not berestricted.

! CAUTION:Combustion air must not be drawn froma corrosive atmosphere.

To maximize heat exchanger life, the combustionair must be free of chemicals which formcorrosive acidic compounds in the combustiongases. Some examples of these chemicals arechlorine, fluorine, and sulphur. Some commonsources of these chemicals are detergents,bleaches, aerosol sprays, cleaning solvents,and a wide variety of commercial and householdproducts.

When installing a furnace in a commercial buildingor in a laundry room or workshop of a residence,it may be necessary to provide outside air to thefurnace for combustion.

! WARNING:Furnace installation using methods otherthan those described in the followingsections must comply with the NationalFuel Gas Code and all applicable localcodes to provide sufficient combustionair for the furnace.

Installation In An Unconfined SpaceAn unconfined space is an area including allrooms not separated by doors with a volumegreater than 50 cubic feet per 1,000 Btuh of thecombined input rates of all appliances which drawcombustion air from that space. For example, aspace including a water heater rated at 45,000Btuh input and a furnace rated at 72,000 Btuhrequires a volume of 5,850 cubic feet [50 x (45 +72) = 5,850] to be considered unconfined. If thespace has an 8 foot ceiling, the floor area of thespace must be 731 square feet (5,850 / 8 = 731).In general, a furnace installed in an unconfinedspace will not require outside air for combustion.However, in “tight” buildings (with weatherstripping and caulk to reduce infiltration), it maybe necessary to provide outside air to ensureadequate combustion and venting, even thoughthe furnace is located in an unconfined space.

Installation In A Confined SpaceA confined space is an area with volume lessthan 50 cubic feet per 1,000 Btuh of the combinedinput rates of all appliances drawing combustionair from that space. Furnace closets, smallequipment rooms and garages are confinedspaces. Furnaces installed in a confinedspace which supply heated air to areas outsidethe space must draw return air from outside thespace and must have the return air ducts tightly

11

sealed to the furnace. A confined spacemust have two openings into the space forcombustion air. One opening must bewithin 12 inches of the ceiling, and theother must be within 12 inches of the floor.The required sizing of these openings isdetermined by whether inside or outside air isused to support combustion, the method bywhich the air is brought to the space, and by thetotal input rate of all appliances in the space.

Air From Inside (See Figure 4) If combustion air is taken from the heatedspace, the two openings must each have a freearea of at least one square inch per 1,000 Btuhof total input of all appliances in the confinedspace, but not less than 100 square inchesof free area. For example, if the combined inputrate of all appliances is less than or equal to100,000 Btuh, each opening must have a freearea of at least 100 square inches. If thecombined input rate of all appliances is 126,000Btuh, each opening must have a free area of atleast 126 square inches.

Outdoor Air Using Vertical Ducts(See Figure 5)If combustion air is taken from outdoors throughvertical ducts, the openings and ducts musthave a minimum free area of one square inch per4,000 Btuh of total appliance input. In installationsdrawing combustion air from a ventilated attic,both air ducts must extend above the atticinsulation.

If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.

The combustion air openings must not berestricted in any manner.

! CAUTION:Do not supply combustion air from anattic space that is equipped with powerventilation or any other device that mayproduce a negative pressure.

Air Directly Through An Exterior Wall(See Figure 6)If combustion air is provided directly through anexterior wall, the two openings must each havefree area of at least one square inch per 4000Btuh of total appliance input.

Outdoor Air Using a Crawl Space and VentilatedAttic (See Figure 7)When directly communicating with the outdoors,each opening shall have a minimum free area of1 square inch per 4,000 Btuh of total applianceinput. The openings shall communicate directly,or by ducts, with the outdoor spaces (crawl orattic) that freely communicate with the outdoors.

Outdoor Air Using Horizontal Ducts (SeeFigure 8)If combustion air is taken from outdoors throughhorizontal ducts, the openings and ducts musthave a minimum free area of one square inch per2,000 Btuh of total appliance input.

If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.

The combustion air openings must not berestricted in any manner.

VENTING REQUIREMENTS

General

This furnace must be vented in compliance with,the current revision of the National Fuel GasCode (ANSI-Z223.1/NFPA54), with theinstructions provided below. This furnace isapproved for Category I venting only.

In Canada, venting shall conform to therequirements of the current (CAN/CGA B149.1or .2) installation codes. Consult local codesfor special requirements.

This furnace must never be vented to a chimneyflue servicing a fireplace or other appliancedesigned to burn solid fuel. If the furnace vent isto be connected to a chimney serving a fireplace,the fireplace must be sealed off from the chimney.

Single wall metal vents shall not be used forCategory I venting. Category I furnacesmust be vented vertically or near vertically.

For Category I furnace installations, the furnaceshall be connected to a factory built chimney orvent complying with a recognized standard, ora masonry or concrete chimney lined with alining material acceptable to the authority havingjurisdiction. Venting into an unlined masonrychimney or concrete chimney is prohibited.

The furnace vent, if metal, may be insulated iflocal codes allow. Any part of the vent system,metal vent only, not exposed to weather, but

12

which are exposed to ambient temperaturesbelow 35° F must be insulated to preventcondensation. All vent insulation shall be foilbacked fiberglass of one inch minimum thickness.

Three sheet metal fasteners (field supplied)should be used to secure the vent pipe to thefurnace flue. These fasteners should be evenlyspaced around the flue diameter, if possible.

Combustion Air QualityThe recommended source of combustion air isto use the outdoor air supply. However, the useof indoor air in most applications is acceptableexcept as follows:1. If the furnace is installed in a confined

space it is recommended that thenecessary combustion air come from theoutdoors by way of attic, crawl space, airduct, or direct opening.

2. If outdoor combustion air is used, theremust be no exposure to the installations orsubstances listed in Item 3 below.

3. The following types of installation mayrequire Outdoor Air for combustion, dueto 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

areasExposure to the following substances inthe combustion air supply may also requireOutdoor 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 (such as

perchloroethylene)• Printing inks, paint removers, varnishes,

etc.• Hydrochloric acid• Cements and glues• Antistatic fabric softeners for clothes

dryers• Masonry acid washing materials

Category I - Common Venting

When an existing furnace is removed from aventing system serving other appliances, theventing system is likely to be too large to properlyvent the remaining appliances. An improperlysized venting system can result in the formationof condensate, leakage, spillage, etc.

The venting system should be designed to havethe minimum number of elbows or turns. Allhorizontal runs shall be sloped upwards fromthe furnace at 1/4 inch per running foot of vent.Supports for the vent pipe must be installed aminimum of every five feet along the vent run toensure no displacement after installation.

Under no circumstances shall any portion of thevent system extend into or pass through anyreturn air duct, supply air duct, or plenum.

If the furnace is operated with blocked or restrictedventing, the burner roll-out limit switch will open,turning off the gas supply to the burners. The roll-out limit switch is a manually reset device. DONOT install a jumper wire across this switch todefeat its function. DO NOT reset the switchwithout identifying and correcting the fault conditionwhich caused the switch to trip. If this switch mustbe replaced, use only factory-approvedreplacement parts.

! WARNING:Upon completion of the furnaceinstallation, carefully inspect the entireflue system both inside and outside thefurnace to assure it is properly sealed.Leaks in the flue system can result inserious personal injury or death due toexposure of flue products, includingcarbon monoxide.

13

CIRCULATING AIR SUPPLY

GeneralPlenums and air ducts must be installed inaccordance with the Standard for the Installationof Air Conditioning and Ventilating Systems(NFPA No. 90A) or the Standard for the Installationof Warm Air Heating and Air ConditioningSystems (NFPA No. 90B).

It is recommended that the outlet duct be providedwith a removable access panel. This openingshould be accessible when the furnace isinstalled in service and shall be of a size thatsmoke or reflected light may be observed insidethe casing to indicate the presence of leaks inthe heat exchanger. The cover for the openingshall be attached in such a manner as to preventleaks.

! WARNING:CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected tothe venting system being placed into operation could result in carbonmonoxide poisoning or death.The following steps shall be followed for each appliance connected to theventing system being placed into operation, while all other appliancesconnected 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 B149.1, Natural Gas and Propane Installation Codes andthese instructions. Determine that there is no blockage orrestriction, leakage, corrosion and other deficiencies which couldcause an unsafe condition.

3. As far as practical, close all building doors and windows and alldoors between the space in which the appliance(s) connected tothe 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 hoodsand 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 inspectedinto operation. Adjust the thermostat so appliance is operatingcontinuously.

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

8. If improper venting is observed during any of the above tests, theventing system must be corrected in accordance with the NationalFuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, NaturalGas and Propane Installation Codes.

9. After it has been determined that each appliance connected to theventing system properly vents when tested as outlined above,return doors, windows, exhaust fans, fireplace dampers and anyother gas-fired burning appliance to their previous conditions ofuse.

14

If outside air is used as return air to the furnacefor ventilation or to improve indoor air quality, thesystem must be designed so that the return airis not less than 50° F (10° C) during operation.If a combination of indoor and outdoor air is used,the ducts and damper system must be designedso that the return air supply to the furnace isequal to the return air supply under normal,indoor return air applications.

When a cooling system is installed which usesthe furnace blower to provide airflow over theindoor coil, the coil must be installed downstream(on the outlet side) of the furnace or in parallelwith the furnace.

If a cooling system is installed in parallel with thefurnace, a damper must be installed to preventchilled air from entering the furnace andcondensing on the heat exchanger. If a manuallyoperated damper is installed, it must be designedso that operation of the furnace is preventedwhen the damper is in the cooling position andoperation of the cooling system is preventedwhen the damper is in the heating position.

Return AirIn applications where the supply ducts carryheated air to areas outside the space in whichthe furnace is installed, the return air must bedelivered to the furnace by duct(s) sealed to thefurnace casing, running full size and withoutinterruption.

! WARNING:The solid base of these furnaces must bein place when the furnace is installed withside return air ducts. Removal of all or partof the base could cause products ofcombustion to be circulated into the livingspace and create potentially hazardousconditions, including carbon monoxidepoisoning that could result in personalinjury or death.

The return air ductwork may be connected tothe left side return, right side, or bottom. NOTE:Do not use the back of the furnace for returnair. Table 2, in the front pages of theseinstructions, contains the airflow data for each

furnace model. Where maximum airflow is 1800CFM or more, two openings must be used forreturn air.

! WARNING:Products of combustion must not beallowed to enter the return air ductworkor the circulating air supply. Failure toprevent products of combustion frombeing circulated into the living space cancreate potentially hazardous conditionsincluding carbon monoxide poisoningthat could result in personal injury ordeath.

All return ductwork must be secured tothe furnace with sheet metal screws. Forinstallations in confined spaces, all returnductwork must be adequately sealedand joints must be taped. When return airis provided through the bottom of thefurnace, the joint between the furnaceand the return air plenum must be airtight.

The floor or platform on which the furnaceis mounted must provide sound physicalsupport of the furnace with no gaps,cracks, or sagging between the furnaceand the floor or platform.

Return air and circulating air ductworkmust not be connected to any other heatproducing device such as a fireplaceinsert, stove, etc. Doing so may result infire, explosion, carbon monoxidepoisoning, personal injury, or propertydamage.

GAS SUPPLY AND PIPING

! CAUTION:Do not re-drill the burner orifices. If theorifice size must be changed, use onlynew orifices.

15

GeneralThis furnace may be installed for either left or rightside gas entry. A typical gas service hookup isshown in Figure 9. When making the gasconnection provide clearance between the gassupply line and the entry hole in the furnacecasing to avoid unwanted noise and/or damageto the furnace.

All gas piping must be installed in compliance withlocal codes and utility regulations. Some localregulations require the installation of a manual mainshut-off valve and ground joint union external to thefurnace. The shut-off valve should be readilyaccessible for service and/or emergency use.Consult the local utility or gas supplier for additionalrequirements regarding placement of the manual

main gas shut-off. In the absence of local codes thegas line installation must comply with the latest editionof the National Fuel Gas Code (ANSI Z223.1) or(CAN/CGA B149.1 or .2) Installation Codes.

An 1/8 inch NPT tap must be installed in the gasline to the unit for use when measuring the gassupply pressure. The tap should be readilyaccessible for service use. A drip leg should beinstalled in the vertical pipe run to the unit. Table4 lists gas flow capacities for standard pipesizes as a function of length in typical applicationsbased on nominal pressure drop in the line.

IMPORTANT NOTES:1. Gas piping must not be run in or through air

ducts, chimneys, gas vents, elevatorshafts, etc.

2. Compounds used on threaded joints of gaspiping must be resistant to the actions ofliquefied petroleum gases.

3. The main manual gas valve and main powerdisconnect to the furnace must be properlylabeled by the installer in case emergencyshutdown is required.

Leak CheckAfter the gas piping to the furnace is complete,all connections must be tested for gas leaks. Tocheck for leaks in gas piping systems, use onlya soap and water solution or other approvedmethod.

! CAUTION:Do not use matches, lighters, candles, orother sources of open flame to check forgas leaks.

IMPORTANT NOTE:When pressure testing the gas supply linesat pressures greater than 1/2 psig (14 inchW.C.), the furnace must be disconnectedfrom the gas supply piping system to preventdamage to the gas control valve. If the testpressure is less than or equal to 1/2 psig (14inch W.C.), the furnace must be isolatedfrom the gas supply line by closing themanual shut-off valve.

Typical Right Side Entry

Table 4. Capacity of Black Iron Gas Pipe (cu. ft. per hour) for Natural Gas

(specific gravity = .60)

NOMINAL LENGTH OF PIPE RUNBLACK IRON (feet)

PIPE DIAMETER(in.) 10 20 30 40 50 60 70 80

1/2 130 90 75 65 55 50 45 40

3/4 280 190 150 130 115 105 95 90

1 520 350 285 245 215 195 180 170

1 1/4 1050 730 590 500 440 400 370 350

1 1/2 1600 1100 890 760 670 610 560 530

The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace.

To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value of the gas:

Cubic Feet Per Hour Required Input To Furnace (Btu/hr)Heating Value of Gas (Btu/Cu. Ft.)

CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)

Figure 9. Typical Gas Service Connection

Ground JointUnion

Dripleg

Shut-Off Valve

BurnerAssembly

Manifold

Some utilitiesrequire Shut-Off

Valve to be4 to 5 feet

above floor

Automatic GasValve (with manual

shut-off)

16

Furnace RatingPlate Input # #

(Btu/h) Nat LP

45,000 50 57

54,000 47 56

72,000 47 56

90,000 47 56

108,000 47 56

126,000 47 56

Orifice Drill Size

Table 6. Manifold Pressure (in WC) for LP/Propane Gas at Various Altitudes

Elevation (feet above sea level)0 to 2,000 to 5,000 to 6,000 to 8,000 to

1,999 4,999 5,999 7,999 10,000

10.0 8.5 10.0 9.0 8.5Manifold Pressure in (WC)for an LP Gas HeatingValue of 2,500 Btu/hr.

Table 5. Manifold Pressure (in WC) for Natural Gas at Various Altitudes

For a Natural Gas Sea Level Heating Value of 800 to 899 Btu/cu.ft.Elevation (feet above sea level)

zero to 1999

2000 to 4999

5000 to 5999

6000 to 7999

8000 to 10000

Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.5 3.0

For a Natural Gas Sea Level Heating Value of 900 to 999 Btu/cu.ft.Elevation (feet above sea level)

zero to 1999

2000 to 4999

5000 to 5999

6000 to 7999

8000 to 10000

Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.2 2.8

For a Natural Gas Sea Level Heating Value of 1,000 to 1,100 Btu/cu.ft.Elevation (feet above sea level)

zero to 1999

2000 to 4999

5000 to 5999

6000 to 7999

8000 to 10000

Manifold Pressure Setting (in WC) 3.5 3.5 3.0 2.8 2.5

Table 7. Natural and LP Gas OrificeSizes for Elevations between zero

and 4999 ft. Above Sea Level

Table 8. Natural and LP gas OrificeSizes for Elevations between 5000

and 10,000 ft. Above Sea Level

Furnace RatingPlate Input # #

(Btu/h) Nat LP

45,000 50 61

54,000 47 61

72,000 47 61

90,000 47 61

108,000 47 61

126,000 47 61

Orifice Drill Size

17

! WARNING:FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactlycould result in serious injury, death orproperty damage.

Never test for gas leaks with an openflame. Use a commercially available soapsolution made specifically for the detectionof leaks to check all connections. A fire orexplosion may result causing propertydamage, personal injury or loss of life.

ConversionConversion of this furnace to use LP/propanegas must be made by qualified servicepersonnel, using only approved parts.

! WARNING:This furnace was equipped at the factoryfor use with natural gas only. A specialkit, supplied by the manufacturer, isrequired to convert the furnace tooperate on LP/propane gas. Failure touse the proper conversion kit can causefire, explosion, property damage, carbonmonoxide poisoning, personal injury, ordeath.

HIGH ALTITUDE CONVERSIONHigh Altitude ApplicationConversion of this furnace to replace the pressureswitch or to utilize LP/propane gas must be madeby qualified service personnel, using factoryauthorized or approved parts. High altitudeapplication with this furnace can be field performedby a simple adjustment of manifold pressure, andif necessary changing the orifices and thepressure switch. The changes required dependon the installation altitude and the heating valueof the gas. The gas heating value based on sealevel can be obtained from your local gas utility.The heating value of gas at high altitude is alwayslower than the sea level heating value. Theheating values used in Tables 5 & 6 are based onsea level values.

Pressure Switch Conversion for HighAltitude ApplicationsThe pressure switch is factory equipped to

operate between zero and 5000 feet above sealevel. For higher altitude applications, you mayneed to replace the pressure switch. The ap-proved high altitude pressure switch kit is 903853.The directions to convert the furnace are givenbelow:

1. READ ALL INSTRUCTIONS BEFOREPROCEEDING WITH THE CONVERSION.

2. Disconnect all electrical power to thefurnace.

3. Remove the access door(s) from the frontof the unit.

4. Turn the gas valve knob to the OFF position.5. Shut off the gas to the unit.6. Disconnect the electrical leads to the

pressure switch (see Figure 14). It is notnecessary to mark the leads as polaritydoes not matter across the switch.

7. Remove the hose from the pressure switchand remove the fasteners that secure thepressure switch to the burner box.

8. Discard the old pressure switch.9. From the kit, install the new high altitude

pressure switch using the same fastenersthat were removed above.

10. Reattach the hose to the pressure switchport in the same manner as it was removed.

11. Reattach the electrical leads to thepressure switch.

12. Turn on the electrical power to the furnace.13. Turn the gas valve knob to the ON position.14. Follow the start-up procedure outlined later

in these installation instructions. Verifythat the furnace is operating properly afterthe conversion.

Natural Gas High Altitude ConversionAll factory shipped furnaces are ready tooperate up to 4999 ft. above sea level. Forhigher altitudes (between 5000 and 10,000 ft.above sea level), conversion can be achievedsimply by adjusting the furnace manifoldpressure as shown in Table 5.

LP/Propane Gas Sea Level and HighAltitude ConversionIMPORTANT NOTE:When converting a low NOx Furnace fromNatural gas to LP/Propane gas, it is necessaryto remove the NOx Baffles.Conversion to LP/propane gas can beaccomplished by first replacing the natural gasorifices with the appropriate LP/propane orificesshown in Table 7 or 8. Note: for installationsbetween zero and 5000 ft., refer to Table 7. Forinstallations above 5000 ft. above sea level,

18

R C

Y G

W

A/C Condensing Unit

Condensing UnitControl Box

RoomThermostat

Flame Signal Light(Yellow)

Status Light(Red)

60 90 120

180Blower Off

Timing

TWIN

3 AmpFuse

COM

24 V

HU

M

Neutrals

Low VoltageConnections

4 15 26 3

7

8

9

4

5

6

1

2

3

EA

C

HU

M M1

M2

M3

HE

AT

L1

XF

MR

Unused Motor Leads

EA

C

R Y

G W

Connect R & W

ForHeating

Only

FIELD WIRING

NOTE: The "Y" terminal on the UTEC control board must be connected to the thermostatfor proper coolingmode operation.

CO

OL

Figure 10. Line Voltage Field Wiring

Field Supplied Disconnect Within Sight of Furnace

Field SuppliedPanel Connector

Field SuppliedFused Service

Panel

Black (Hot)White (Neutral)Green or Bare

(Ground)

BlackWhite

BlackWhite

BlackWhite

Field Line VoltageWiring

Factory LineVoltage Wiring

Ground Ground Ground

Junction Box (may be internalor external to the furnace). Theseconnections can be made in thefield supplied disconnect at thefurnace.

Figure 11. Line Voltage Field, Four-wire Heating/Cooling Applications

19

Figure 12. Integrated Control

R C

Y G

W

(Yellow)

3 Amp FuseCOM

24 V

HU

M

Neutrals

4 1

5 2

6 3

7

8

9

4

5

6

1

2

3

EA

C

HU

M

M1

M2

M3

HE

AT

CO

OL

L1

XF

MR

Unused Motor Leads

EA

CElectronic Air Tap(.5A@ 120 VAC)

(Red)

Humidifier Tap(.5A@ 120 VAC)

Connect NeutralLead of ElectronicAir Cleanerand/or

Humidifier Here.

Common Leads

TwinningTerminal

60 90 120

180

TWIN

Blower OffTiming

FlameSignalLight

StatusLight

Cooling Speed Tap

Heating Speed Tap

20

TIME FOR TIME FORONE REVOLUTION ONE REVOLUTION

(SECONDS) 1 5 10 (SECONDS) 1 5 1010 360 1800 3600 66 55 273 54512 300 1500 3000 68 53 265 52914 257 1286 2571 70 51 257 51416 225 1125 2250 72 50 250 50018 200 1000 2000 74 49 243 48620 180 900 1800 76 47 237 47422 164 818 1636 78 46 231 46224 150 750 1500 80 45 225 45026 138 692 1385 82 44 220 43928 129 643 1286 84 43 214 42930 120 600 1200 86 42 209 41932 113 563 1125 88 41 205 40934 106 529 1059 90 40 200 40036 100 500 1000 92 39 196 39138 95 474 947 94 38 191 38340 90 450 900 96 38 188 37542 86 429 857 98 37 184 36744 82 409 818 100 36 180 36046 78 391 783 102 35 176 35348 75 375 750 104 35 173 34650 72 360 720 106 34 170 34052 69 346 692 108 33 167 33354 67 333 667 110 33 164 32756 64 321 643 112 32 161 32158 62 310 621 114 32 158 31660 60 300 600 116 31 155 31062 58 290 581 118 31 153 30564 56 281 563 120 30 150 300

GAS FLOW RATE (CUBIC FEET PER HOUR)

CUBIC FEET PER REVOLUTION OF METER

CUBIC FEET PER REVOLUTION OF METER

Table 10. Gas Flow Rate

refer to Table 8. After changing the orifices, useTable 6 to determine the appropriate manifoldpressure for your installation.

Conversion to LP/propane, sea level, and highaltitude is detailed in the installation instructionsprovided with the conversion kit. Approvedconversion kits are listed below.

United States LP/Propane Gas Sea Level andHigh Altitude Conversion Kit - P/N 904090AThis kit is for LP/propane conversion in theUnited States at altitudes between zero and10,000 ft. above sea level. Follow the installationinstructions supplied with the kit for properinstallation.

Canadian LP/Propane Gas Sea Level and HighAltitude Conversion Kit - P/N 904091AThis kit is for LP/propane conversions in Canadaat altitudes between zero and 4500 ft. above sealevel. Follow the installation instructions suppliedwith the kit for proper installation.

Table 9. Electrical Data

** Time-delay fuses or HACR-type circuit breakers are required.

Thermostat Recommended ThermostatWire Wire Length

Gauge 2-wire 4 or 5-wire(heating) (cooling)

24 55 ft. 25 ft.

22 90 ft. 45 ft.

20 140 ft. 70 ft.

18 225 ft. 110 ft.

Furnace Maximum Minimum MaximumModel Number Furnace Wire Fuse or Circuit

*RA Amperes Gauge Breaker Amps**

045-08A 6.8 14 15054-12A 9.3 14 15072-12A 9.3 14 15072-12B 9.3 14 15072-16B 11.6 14 15090-12B 9.3 14 15090-16B 11.6 14 15090-20B 15.6 12 20108-16B 11.6 14 15108-20B 15.6 12 20108-20C 15.6 12 20126-20C 15.6 12 20

21

! CAUTION:To avoid electric shock, personal injury,or death, turn off the electric power at thedisconnect or the main service panelbefore making any electricalconnections.

ELECTRICAL WIRING

General

Electrical connections must be made inaccordance with all applicable local codes andordinances, and with the current revision of theNational Electric Code (ANSI/NFPA 70).

For Canadian installations the electricalconnections and grounding shall be done inaccordance with the current Canadian ElectricalCode (CSA C22.1, Part 1 and/or local codes).If any of the original wire as supplied with thefurnace must be replaced, it must be replacedwith wire having a temperature rating of at least105°C. Refer to the furnace nameplate andTable 9 for electrical requirements.

Line Voltage WiringThe line voltage (115 volt) to the furnace must besupplied from a dedicated branch circuit containingthe correct fuse or circuit breaker for the furnace.(See Table 9.) An electrical disconnect must beinstalled to be readily accessible from and locatedwithin sight of the furnace. (See the WiringDiagram label in the furnace and Figure 10.)

! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerousoperation.

Verify proper operation after servicing.

The furnace cabinet must have an uninterrupted,unbroken ground to minimize injury should anelectrical fault condition occur. The controlsused in this furnace require an earth groundto operate properly. Acceptable methods forgrounding are electrical wire or conduit approvedfor electrical ground service. Do not use gaspiping as an electrical ground.

IMPORTANT NOTE:Proper line voltage polarity must bemaintained in order for the control systemto operate correctly. Verify that the incomingneutral line is connected to the white wireand the incoming “hot” line is connected tothe black wire. These furnaces will notoperate unless the polarity and ground areproperly connected. See Figure 10.

Low Voltage WiringInstall the thermostat per the manufacturer’sinstructions. The low voltage (24 volt)connections from the thermostat are made atthe terminal strip on the integrated control in thefurnace. See Figure 11 for the properconnections for heating only (two-wire) andheating/cooling (four-wire) applications. Therecommended minimum wire gauge forthermostat wiring is shown in Table 9.

The thermostat must not be installed on anoutside wall or any other location where itsoperation may be adversely affected. Adverseaffects include radiant loading from fireplaces,sunlight, or lighting fixtures, and convective loadingfrom warm air registers or electrical appliances.To determine the heat anticipator setting either:

1. Add the current draw of the systemcomponents; or

2. Measure the current flow on the thermostatR-W circuit after the circulating blowermotor has started.

Set the heat anticipator according to thethermostat manufacturer’s instructions for heatanticipator settings.

START-UP AND ADJUSTMENTSGeneralPrior to start-up, verify that:1. The line voltage power leads are securely

connected, that the polarity of theconnections is correct, and that the furnaceis properly grounded.

2. The thermostat wires (R, W, Y, and G) aresecurely connected to the correct leads onthe terminal strip of the circuit board.

3. The gas line service pressure does notexceed 10.0 in. water column (0.36 psig),and is not less than 4.5 in. water column(0.16 psig) for natural gas. For LP gas theline service pressure must not exceed 14

22

IGNITOR

INDUCER

GAS

VALVE

SUPPLY AIRLIMIT SWITCH(ALL MODELS)

VENTSAFETY SWITCH

(SELECTMODELS ONLY)

TRANSFORMER

FLAME SENSOR

C

GREEN

BLACKWHITE

BLUE BLUE

24 V 120 V

OR

AN

GE

BL

UE

BL

UE

YELLOWBROWN

RED

BLACK

WHITE

ORANGE

BLUE

BL

AC

K

OR

AN

GE

BLACK

RED

AIR CONDITIONERCONDENSING UNIT

BLACK

BLACK

BLOWER DOORSWITCH

R

WHITE

BLACK

WHITE W/ BLK STRIPES

BLK W/ WHITE STRIPES

WHITE (NEUTRAL)

BLACK 120V

GROUND

ROOM THERMOSTAT

3 OR 4 SPEED MOTOR

H

MHML

L

C

WH

ITE

RE

D

OR

AN

GE

BL

UE

BL

AC

K

MOTORPLUG

1

2

3

4

5

6

BLACK

BLUE

FLAME ROLL-OUTSWITCH

(ALL MODELS)

VENTPRESSURE SWITCH(93+ MODELS ONLY)

PRESSURESWITCH

R

Y

G

W

C

Y

1801209060

These wires arenot present

on all models

BLOWERDECK SWITCH

(SELECTMODELS ONLY)

Legend

Field WiringFactory Wiring:

Low VoltageHigh Voltage

Power On

Limit Circuit Open or External Load On "W"

Pressure Switch is Open with Inducer On

Pressure Switch is Closed with Inducer Off

Ignition Failure (Check Ground)

115 VAC & Neutral Reversed or no Ground

False Flame or Gas Valve Relay Shorted

ON

1 FLASH

2 FLASHES

3 FLASHES

4 FLASHES

5 FLASHES

Continuous

STATUSRED LIGHTFAULT CONDITION

Power Off

Low Flame Sensor Signal

Flame Present

ContinuousFlash

OFF

ON

FLAMEYELLOW

LIGHTFAULT CONDITION

BLUE

FLAMEROLL-OUT SWITCH

(SELECTMODELS ONLY)

Refer to the InstallationInstructions provided with the furnace for theproper heating andcooling speeds for yourapplication.

VENT SAFETY SWITCH(SELECT MODELS ONLY)

If any of the originalwire as supplied withthe furnace must bereplaced, it must bereplaced with wiringmaterial having atemperature rating ofat least 105° C.

Use copperconductors only.

WD#710355

Figure 13. Wiring Diagram

23

in. water column (0.51 psig), and must notbe less than 11.0 in. w.c. (0.40 psig).

4. The roll-out manual reset switch is closed.If necessary, press the red button to reseta switch. DO NOT install a jumper wireacross a switch to defeat its function. Ifa switch reopens on start-up, DO NOTreset the switch without identifying andcorrecting the fault condition which causedthe switch to trip.

5. The blower door is in place, closing thedoor switch in the line voltage circuit.

6. The gas line has been purged and allconnections are leak tight.

Start-up ProceduresAfter all of the above checks have been made:

1. Set the thermostat to the lowest setting.

2. Close the disconnect(s) to provide linevoltage to the furnace.

3. Follow the procedures given on theoperating instruction label attached to thefurnace.

4. Set the thermostat above roomtemperature and verify the operatingsequence. (See the Sequence ofOperation).

5. After the furnace has run for approximatelyfive minutes, set the thermostat belowroom temperature and verify steps (9)through (11) of the Sequence ofOperation.

Verifying and Adjusting Firing RateThe firing rate must be verified for eachinstallation to prevent over-firing the furnace.

Follow the procedure below to determine thefiring rate.

1. Shut off all other gas fired appliances.

2. Start the furnace and allow it to run for atleast three minutes.

3. Measure the time (in seconds) required forthe gas meter to complete one revolution.

4. Convert the time per revolution to cubicfeet of gas per hour using Table 10.

5. Multiply the gas flow rate in cubic feet perhour by the heating value of the gas in Btuper cubic foot to obtain the firing rate in Btuper hour. Example:

• Time for 1 revolution of a gas meter witha 1 cubic foot dial = 40 seconds.

• From Table 10 read 90 cubic feet perhour of gas.

• Heating value of the gas (obtained fromgas supplier) = 1040 Btu per cubic foot.

• Firing rate = 1040 x 90 = 93,600 Btuh.

6. Adjustments to the firing rate can be madeby adjusting the gas manifold pressure.See the High Altitude Application sectionfor additional information of firing rate atelevations above 2000 ft.

The manifold pressure must be set to theappropriate value for your installation. Refer toeither Table 5 for natural gas or Table 6 for LP/propane gas to verify the manifold pressuresetting required for your particular installation.To adjust the manifold pressure, remove theregulator cap and turn the adjusting screwclockwise to increase pressure or counter-clockwise to reduce pressure. Replace theregulator cap after adjustments are complete.

Verifying and Adjusting Temperature RiseVerify the temperature rise through the furnaceis within the range specified on the furnace ratingplate. Temperature rises outside the specifiedrange could result in premature heat exchangerfailure and/or cycling on limit switch.

Place thermometers in the return and supply airstream as close to the furnace as possible. Thethermometer on the supply air side must beshielded from direct radiation from the heatexchanger to avoid false readings. Adjust allregisters and duct dampers to the desiredposition and run the furnace for ten to fifteenminutes before taking any temperature readings.The temperature rise is the difference betweenthe supply and return air temperatures.

For typical duct systems, the temperature risewill fall within the range specified on the ratingplate with the blower speed at the factoryrecommended setting. If the temperature risemeasured is outside the range specified, it maybe necessary to change the blower speed.

24

Figure 14. Location of Major Components

8

1

3

5

4

11

7

6

13

14

12

10

9

8 Exhaust Adapter9 Low Voltage Transformer

10 Burner Assembly11 Supply Air Limit Switch12 Blower Assembly13 Induced Draft Blower14 Vent Transition

1 Igniter2 Flame Sensor (Not Shown)3 Gas Valve4 Flame Roll-out Switch5 Pressure Switch6 Control Board7 Blower Door Switch

25

Lower blower speeds will increase thetemperature rise and higher blower speeds willdecrease the temperature rise.

The furnace is equipped with a multi-speedmotor. Heating and cooling speed selection ismade by moving the leads on the integratedcontrol located in the furnace. The wiringdiagram on the furnace and Figures 12, 13 and14 show the speed taps for adjusting motorspeed.

If it is desired that the blower operate at the sameunused speed for heating and cooling, moveblower leads to M1, M2, and/or M3 and install thejumper wire found in the plastic instruction bag.Remove the desired blower tap, and install thejumper wire piggyback to the heating speed tap,and straight quick connect to the cooling speedtap. Reconnect the desired blower tap topiggyback quick connect.

The integrated control is factory set to start thecirculating air blower 30 seconds after the gasvalve is opened. The integrated control isfactory wired to turn the blower motor off 120seconds after the gas valve is closed. Ifnecessary for comfort, the “off” time may bechanged by adjusting the Blower Off jumper onthe integrated control. See Figure 12 or 13 forblower on and off time adjustments.

! WARNING:To avoid electric shock, personal injury,or death, disconnect the electric powerbefore performing any maintenance.

Verifying Burner OperationTo verify operation of the burners, make surethat the furnace door is in place and that thereis power to the furnace. Set the thermostat toa temperature above room temperature andobserve the ignition sequence. The burnerflame should carry over immediately between allburners. The flames should be blue, withoutyellow tips. Flames should extend from eachburner without lifting off, curling, or floating. Afterverifying satisfactory flame characteristics, setthe thermostat to a temperature below roomtemperature and verify that the burner flameextinguishes completely.

Verifying Operation of the Supply AirLimit SwitchTo verify operation of the supply air limit switch,make sure that the blower door is in place andthat there is power to the furnace. Block thereturn airflow to the furnace by installing aclose-off plate in place of or upstream of thefilter(s). Set the thermostat to a temperatureabove room temperature and verify that theSequence of Operation is as described inthese instructions. The limit switch shouldfunction to turn off the gas valve withinapproximately four minutes (the exact timedepending on the efficiency of the close-off inblocking the return air to the furnace). Thecirculating air and combustion blowers shouldcontinue to run when the limit switch opens.Remove the close-off immediately after thelimit switch opens. If the furnace operates formore than four minutes with no return air, setthe thermostat to a temperature below roomtemperature, shut off the power to the furnace,and replace the limit switch.

DESCRIPTION OF COMPONENTS

Figure 14 shows the location of each of thefunctional components described below. Also,refer to the Sequence of Operation Section ofthis manual . If any component of the furnacemust be replaced, use only factory authorizedreplacement parts. See the Replacement PartsList for the factory authorized replacement foreach component.

Supply Air Limit SwitchThe supply air limit switch prevents the airtemperature leaving the furnace from exceedingthe maximum allowable outlet air temperature.

Flame Sensor

The flame sensor acts to prove that flame hascarried over from the igniter to the opposite endburner. If no flame is sensed, the furnace willshut down within 7 seconds.

Flame Roll-Out Switch

The flame roll-out switch verifies that the burnerflames are drawn into the heat exchanger tubes.If the burner flames are not properly drawn intothe heat exchanger, the flame roll-out switch willopen. The circulating air blower and combustionblower will continue to operate if the flame roll-out switch opens.

26

Gas Valve

The gas valve controls the flow of gas to theburners. When the gas valve is energized itautomatically opens and regulates the gaspressure in the manifold.

Pressure Switch

The pressure switch verifies that the inducer isdrawing the combustion gases through the heatexchanger.

MAINTENANCE

It is recommended that the furnace be checkedyearly. At a minimum, this check should includethe following items.

! WARNING:To avoid electrical shock, personal injury,or death, turn off the electric power at thedisconnect or the main service panelbefore making any electricalconnections.

! WARNING:Products of combustion must not beallowed to enter the living space. Failureto prevent products of combustion frombeing circulated into the living spacecan create potentially hazardousconditions including carbon monoxidepoisoning that could result in personalinjury or death.

Vent SystemCheck the vent pipe to ensure that it is notcorroded or blocked by debris. Any corrodedsection of vent pipe must be replaced, and anyobstruction or blockage must be removed priorto operating the furnace.

Air Filter(s)

! WARNING:Never operate the furnace without a filterin place. Dust and lint in the return air canbuild up on internal components,resulting in loss of efficiency, equipmentdamage, and possible fire.

Air filter(s) are not supplied with the furnaceas shipped from the factory.

The installer must provide a high velocity filterand rack for a filter in the return air duct adjacentto the furnace, or in a return air grill to thefurnace. Filters should be changed or cleanedmonthly during the heating season. New ornewly renovated homes may require morefrequent changing until the construction dusthas been removed.

Filters for side return and bottom returnapplications are available from your localdistributors.

LubricationThe bearings in the circulating air blower motorand inducer blower used in these furnaces arepre-lubricated and sealed at the factory. Nofurther oiling of the bearings is required for thelife of the motor.

Blower CompartmentThe blower compartment should be cleanedmonthly during the heating and cooling seasonsto remove any dirt and lint that may haveaccumulated in the compartment or on theblower and motor. Dirt and lint can createexcessive loads on the motor resulting in higherthan normal operating temperatures andshortened service life.

Heat Exchanger and Burner MaintenanceThe furnace should operate for many yearswithout soot buildup in the flue passageways,however, the flue passageways, the ventsystem, and the burners should be inspectedand cleaned (if required) by a qualifiedserviceman annually to ensure continued safeoperation. Particular attention must be given toidentify deterioration from corrosion or othersources.

! WARNING:Holes in the vent pipe or heat exchangercan cause products of combustion toenter the home. Replace the vent pipeor heat exchanger if leaks are found.Failure to prevent products ofcombustion from being circulated intothe living space can create potentiallyhazardous conditions including carbonmonoxide poisoning that could result inpersonal injury or death.

27

Cleaning Of Flue PassagesIf the flue passages must be cleaned, follow thesteps below. See Figure 14 for componentlocation and identification.

1. Shut off the gas supply to the furnace eitherat the meter or at the manual valve in thegas supply piping.

2. Turn off all power to the furnace and set thethermostat to the lowest temperaturesetting.

3. Remove the louvered door from the furnace.

4. Turn the gas control lever to the OFFposition.

5. Disconnect the wires from the gas valve,igniter, flame sensor, combustion air motor,flame roll-out switch, over-temperature limitswitch, pressure switch.

! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerousoperation.

6. Remove the silicone rubber tube from thecollector pan.

7. Remove the screws that hold the ventcontrol assembly to the top panel.

8. Remove the nuts that hold the combustionair motor to the collector pan, and removethe complete combustion air blower andcombustion tube assembly. BE CAREFULNOT TO BREAK THE SEALS AT EACHEND OF THE COMBUSTION AIR TUBE.

9. Remove the screws that hold the collectorpan in place, and remove the collector panfrom the furnace.

10. Using wrenches, separate the ground-joint union in the gas supply piping at thefurnace.

11. Remove the piping between the gas valveand the ground-joint union, if necessary.

12. Remove the screws that hold the burnerassembly in place and remove the burnerassembly. BE EXTREMELY CAREFULNOT TO DAMAGE THE IGNITER WHILEREMOVING THE BURNER ASSEMBLY.

13. The furnace heat exchanger tubes cannow be cleaned by the use of a round wirebrush attached to a length of high gradestainless steel cable, such as drain cleanoutcable. Attach variable speed reversibledrill to the other end of the spring cable.Slowly rotate the cable with the drill andinsert it into the top portion of the heatexchanger. While reversing the drill, workthe cable in and out several times to obtainsufficient cleaning. Repeat this sequencefor each heat exchanger tubes.

14. When all heat exchanger tubes have beencleaned, any debris inside the tubes can beremoved with the nozzle of a vacuumcleaner.

15. With a light, check the condition of theupper and lower sections of the heatexchanger tube.

16. Inspect the burners and clean them (ifnecessary) with a soft wire brush and/orthe nozzle of a vacuum cleaner. BEEXTREMELY CAREFUL NOT TODAMAGE THE IGNITER WHILECLEANING THE BURNER.

17. Replace all the parts in reverse order fromwhich they were removed.

18. Follow the lighting instructions found on thefurnace door to return the furnace tooperation. Verify proper operation afterservicing.

Cleaning of Burners If the burners must be cleaned, follow the stepsbelow. See Figure 14 for component locationand identification.

1. Shut off the gas supply to the furnace eitherat the meter or at a manual valve in thesupply piping.

2. Turn off all power to the furnace and set thethermostat to the lowest temperaturesetting.

3. Remove the upper louvered door from thefurnace.

4. Turn the gas control lever to the OFFposition.

5. Disconnect the wires from the gas valve,igniter, and flame sensor.

28

6. Using wrenches, separate the ground-joint union in the gas supply piping at thefurnace.

7. Remove the piping between the gas valveand the ground-joint union, if necessary.

8. Remove the screws that hold the burnerassembly in place and remove the burnerassembly. BE EXTREMELY CAREFULNOT TO DAMAGE THE IGNITER WHILEREMOVING THE BURNER ASSEMBLY.

9. Inspect the burners and clean them (ifnecessary) with a soft wire brush and/orthe nozzle of a vacuum cleaner. BEEXTREMELY CAREFUL NOT TODAMAGE THE IGNITER WHILECLEANING THE BURNER.

10. Replace all the parts in reverse order fromwhich they were removed.

11. Follow the lighting instructions found onthe furnace door to return the furnace tooperation. Verify proper operation afterservicing.

SYSTEM OPERATION INFORMATIONGeneralProper maintenance is most important toachieve the best performance from a furnace.Follow these instructions for years of safe,trouble free operation.

1. Do not place combustible materials on oragainst the furnace cabinet or within 6inches of the vent pipe (or for B-vent usethe recommended clearance).

2. Do not store gasoline or any other flammablevapors and liquids in the vicinity of thefurnace.

3. Change or replace the air filters monthlyduring any period when the circulatingblower is operating regularly.

4. Always replace the doors on the furnaceafter servicing or cleaning/changing thefilters. Do not operate the furnace withoutall doors and covers in place.

5. Avoid operating the furnace when windowsand doors are open.

6. Be sure that the thermostat is properlyinstalled and is not being affected bydrafts or heat from lamps or otherappliances.

Sequence of OperationThe operating sequences for the heating,cooling, and fan modes are described below.Refer to the field and furnace wiring diagrams;Figures 10, 11, 12 and 13.

Heating Mode:1. On a call for heat the thermostat closes,

applying 24 VAC to the W terminal on thecontrol board.

2. The control board checks for continuityon the 24 VAC limit control circuit (over-temperature limit switch, flame roll-outswitches. If an open limit is detected thecontrol board will energize the inducerand the conditioned air blower. All othersystem functions will be inoperable untilthe limit circuit closes. While the limit isopen, the red LED will pulse at a rate of1 blink per unit time.

3. The furnace control checks for continuityacross the pressure switch (24 VAC). Ifthe pressure switch is closed the heatmode sequence will not continue. If itremains closed for 10 seconds the redLED will blink 3 times repetitively until thefault condition clears.

4. The inducer is energized.

5. The pressure switch will close. If thepressure switch does not close after 10seconds the fault LED will blink 2 timesrepetitively and the inducer will continue torun until the switch is closed.

6. The inducer will pre-purge for 30 secondsand then the igniter will start its warm-up asfollows:

Initial Power up: After 30 seconds of igniterwarm-up the gas valve (24 VAC) will thenopen. The igniter circuit will stay energizedfor 3 seconds after the gas valve opens.

After Initial Power up: The control has aprogrammed adaptive ignition feature whichvaries the warm-up period as follows: Ifignition is successful the warm-up isreduced by 3-seconds on each subsequentcall for heat until ignition failure occurs.Upon ignition failure, the warm-up isincreased by 3-seconds on the next try. Ifsuccessful, the timing remains fixed at thislevel. In general, whenever ignition failureoccurs the warm-up interval is increased

29

by 3-seconds on the next try. And ifsuccessful, it remains there. Minimum andmaximum warm-up time limits are set at 6and 54-seconds, respectively.

7. The furnace control must prove flame viathe flame sensor between 3 and 5 secondsafter the gas valve opens. If flame issensed, all burners are on and the ignitercools off. If no flame is sensed, the gasvalve closes immediately and the inducercontinues to run. A second trial for ignition(step 6) begins if no flame is sensed on thefifth try for ignition, the furnace control islocked and the red LED will blink 4 timesrepetitively. The thermostat must beopened for at least ten seconds to reset thefurnace control after a lock out. Otherwise,the furnace will attempt another ignitionsequence in 1 hour.

8. The furnace control energizes thecirculating air blower on the heating speed30 seconds after the gas valve circuit isenergized.

9. When the thermostat has been satisfied,gas valve is de-energized.

10. The inducer is de-energized after a 30-second post purge.

11. The furnace control keeps the circulatingair blower energized for 120 seconds(factory set) or 60, 90, or 180 seconds(field adjustable). (See Figure 12.)

12. Abnormal conditions: If a limit opens duringoperation, the inducer and circulating airblower continue to operate. The gas valveis de-energized immediately. The blowerscontinue to operate until the limit closes.When the limit closes the inducer blower isde-energized immediately. The circulatingair blower continues to operate for thespecified delay (factory set at 120seconds).

Cooling Mode:1. On a call for cooling the thermostat closes,

applying 24 VAC to the G and Y terminalson the furnace control. This closes thecompressor contactor.

2. The furnace control energizes thecirculating blower (115 VAC) on the coolingspeed.

3. When the thermostat is satisfied, the G andY terminals on the control board are de-

energized opening the compressorcontactor.

4. The circulating air blower is de-energizedafter a 90-second delay.

Fan Mode:1. On a call for fan operation, the thermostat

applies 24 VAC to the G terminal on thefurnace control board.

2. The circulating air blower is energizedimmediately on the heating speed.

3. If the furnace is operated in the continuousON position at the thermostat and is thenswitched to AUTO, the circulating blowerwill operate for a specified delay (factoryset at 120 seconds).

Furnace Fails to Operate

If the furnace does not operate check thefollowing:1. Is the thermostat operating properly?

2. Is the blower compartment door in place?

3. Is the furnace disconnect closed?

4. Has the circuit breaker tripped or thecontrol board fuse burned open?

5. Is the gas turned on?

6. Are any manual reset switches open?

7. Is the filter dirty or plugged?

8. Is the flame sensor coated? (Remove andclean with steel wool.)

If the furnace locks out after 5 attempts forignition, it will try again every hour if a call for heatremains. If the inducer and circulating air blow-ers are operating, and items 1 through 8 havebeen checked, press the red reset button on theburner roll-out switches (See Figure 14). If thefurnace operates after depressing either resetbutton, contact a qualified serviceman to identifyand repair the problem.

If the furnace continues to not operate, depressthe red reset buttons on the flame roll-outswitches. (See Figure 14.) If the furnace oper-ates after depressing the reset buttons, contacta qualified servicemen to identify and repair theproblem.

30

TwinningThe control board on these furnaces is capableof being twinned to another furnace of the sameseries or a G series furnace with a UTEC controlboard. If using UTEC control boards, leave thefuses installed on each board. The thermostatwires and the 3/16 inch quick-connect terminalsmarked “TWIN” on the furnace controls mustbe wired for twinning. (See Figure 15.)

W G Y RThermostat

A/CUnit

Twin Terminal

RCYGW

RCYGW

Twin Terminal

Figure 15. Twinning

31

INSTALLATION/PERFORMANCE CHECK LIST

LOCATION _________________ CITY ___________________ STATE ______________

INSTALLER ________________ CITY ___________________ STATE ______________

UNIT MODEL NUMBER _________________________________

UNIT SERIAL NUMBER _________________________________

Minimum Clearances per Table 3? ______

Electrical Connections tight? __________

Line Voltage Polarity correct? __________

Supply Voltage: _________ Volts

Blower Motor HP: ___________________

FUEL TYPE:

Natural Gas ________________________

LP/Propane ________________________

Gas Piping Connections

leak-tested? ______________________

Gas Line Pressure: __________________

(in. water column, with furnace operating)

Manifold Pressure: __________________(in. water column, with furnace operating)

Is there adequate fresh air supply for

combustion and ventilation? ___________

Furnace Input: __________________ (Btuh)

Supply Air Temperature: __________ (° F)

Return Air Temperature: __________ (° F)

Temperature Rise: ______________ (° F)

Are Flue Connections tight? _____________

Is there Proper Draft? __________________

Is Vent free from restrictions? ____________

Is the Filter(s) secured in place? __________

Is the Filter(s) clean? __________________

Has the Thermostat been calibrated? ______

Is the Thermostat level? ________________

Is the Heat Anticipator Setting correct? ____

Has the Owner's Information been reviewed

with the homeowner? __________________

Has the Literature Package been left near the

furnace? ____________________________

O'Fallon, MO

7085060 (Replaces 708337A)

Specifications and illustrations subject to changewithout notice and without incurring obligations.

Printed in U.S.A. (11/05)

¢708506,¤7085060