Nordyne Forced Air Gas And Oil Furnace M1B Users Manual 708672 0 M1 Series Ii.pmd

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For installation in:

1. Manufactured Homes

2. Recreational Vehicles, Park Models,

Manufactured Buildings

3. Modular Homes/Buildings

!

WARNING:

If the information in this manual is not

followed exactly, a fire or explosion

may result causing property damage,

personal injury or loss of life.

– Do not store or use gasoline or other

flammable vapors and liquids in the

vicinity of this or any other appli-

ance.

– 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 build-

ing.

• Immediately call your gas supplier

from a neighbor’s phone. Follow the

gas supplier’s instructions.

• If you cannot reach your gas sup-

plier, call the fire department.

– Installation and service must be per-

formed by a qualified installer, ser-

vice agency or the gas supplier.

! WARNING:

Should overheating occur, or the gas

supply fail to shut off, shut off the

manual gas valve to the appliance

before shutting off the electrical sup-

ply.

! WARNING:

Improper installation, adjustment, al-

teration, service or maintenance can

cause injury or property damage. Re-

fer to this manual. For assistance or

additional information consult a quali-

fied installer, service agency or the

gas supplier.

Owners Manual/Installation Instructions

Series M1B, M1G, M1M and M1S

Downflow, Direct Vent (Sealed Combustion)

Forced Air Gas and Oil Furnaces

LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER.

2

TABLE OF CONTENTS

1. SPECIFICATIONS ................................................................................... 3

2. OWNERS INFORMATION ....................................................................... 3

3. MANUFACTURER WARRANTY, OWNER RESPONSIBILITY ................. 3

4. INSTALLATION STANDARDS ................................................................. 5

5. UNIT LOCATION ..................................................................................... 6

6. MINIMUM CLEARANCES ........................................................................ 6

7. RETURN AIR PROVISIONS .................................................................... 6

8. AIR DISTRIBUTION SYSTEMS .............................................................. 8

9. ROOF JACK SELECTION ....................................................................... 8

10. DUCT CONNECTOR SELECTION ........................................................... 9

11. INSTALLATION ..................................................................................... 11

12. INSTALLATION OF TRANSIT-MODE VENTING SYSTEM ................... 14

13. ELECTRICAL WIRING ........................................................................... 15

14. FUEL PIPING ........................................................................................ 16

15. FLUE GAS SAMPLING.......................................................................... 19

16. LIGHTING AND FURNACE SHUT DOWN .............................................. 20

17. SERVICE GUIDE ................................................................................... 25

18. MAINTENANCE ..................................................................................... 30

19. OPTIONAL ACCESSORIES .................................................................. 31

20. WIRING DIAGRAMS ......................................................................... 34-39

21. EQUIVALENT ORIFICE SIZES AT HIGH ALTITUDES .......................... 40

Table 1. Model Identification

Door Color

W - White

G - Gray

Cabinet Dimensions

A - 56" x 19-3/4" x 23-3/4”

B - w/Coil Cavity,

76" x 19-3/4" x 23-3/4"

Electrical Code

A - 1PH, 60 Hz, 120 VAC

Heating Capacity

Input, BTUH (000’)

Application

M-Manufactured Home

Furnace Series

Fuel, Type of Combustion

G-Gas, Direct Vent, Pilot Burner

Natural or Forced Draft

M-Gas, Direct Vent, HSI,

Forced Draft

B-Gas, Direct Vent, Gun Burner

S-Oil, Direct Vent, Gun Burner

Comfort Model

H - Heating

A - Heating, A/C Ready

B - A/C Ready, 3 Ton

C - A/C Ready, 4 Ton

D - A/C Ready, 5 Ton

M 1 M B - 056 A - B W

3

!

WARNING:

Do not use this appliance if any part

has been submerged under water.

Immediately call a qualified service

technician to inspect the appliance

and to replace any part of the control

system and any gas control that has

been submerged underwater.

NOTICE TO INSTALLER

Installer is advised to follow carefully all instruc-

tions and warnings in this manual to insure

maximum performance, safety, and operating

efficiency of these appliances. Improper instal-

lation may create hazardous conditions, and

will void the appliance warranty.

1.SPECIFICATIONS

General Description

M1 Series gas and oil furnaces are listed direct

vent (sealed combustion), downflow heating

appliances for manufactured (mobile) homes,

recreational vehicles, and for use in residential/

modular/commercial construction. The furnace

must be located so that venting can be properly

achieved.

Air conditioning may be added to structures with

M1 series furnaces using Platinum series air

conditioning or conventional units. This Instal-

lation Instruction manual includes special re-

quirements for incorporation of air conditioning

equipment to the M1 series of furnaces.

Multi-speed blower assemblies as shown in

Table 3 have been certified for field installation

in M1 Series furnaces. An air conditioner can be

easily field installed with M1GH Series furnaces

if used in conjunction with certified 2-wire relay

box, p/n 903092A or 4/5 wire relay box 902898A.

2.OWNER INFORMATION

ABOUT YOUR CENTRAL

FURNACE SYSTEM

NORDYNE has been involved in the design of

products for the manufactured home industry

since the first manufactured home or trailer was

built.

NORDYNE originated the sealed combustion

system, which separates the furnace combus-

tion system from the living area of the home,

now a standard for the manufactured home

industry.

NORDYNE engineers developed the first cen-

tral heating system and the first central air

conditioner for manufactured homes.

NORDYNE is dedicated to bringing to its cus-

tomers the finest heating and cooling comfort

possible. NORDYNE constantly seeks to fur-

ther refine its products to continuously provide

exceptional comfort.

Follow the instructions in this booklet carefully

and this appliance will provide many years of

superior performance.

If you wish to cool your home automatically with

a central air conditioning system investigate the

excellent NORDYNE cooling systems avail-

able from your heating and cooling contractor.

These systems are designed to work best with

your NORDYNE furnace and have been care-

fully engineered to deliver optimum performance

when mated with NORDYNE manufactured

home furnaces.

NORDYNE also offers water heaters, fire-

places and ventilating systems specifically de-

signed for manufactured housing applications.

Check with your manufactured home retailer,

your heating and cooling contractor or your

distributor for information. Write directly to the

factory (PO Box 46911, St. Louis, MO 63146)

if you are not able to locate a source for

NORDYNE manufactured housing products in

your area.

3. MANUFACTURER WARRANTY,

OWNER’S RESPONSIBILITIES

It is the sole responsibility of the homeowner to

make certain the gas furnace has been cor-

rectly set up and converted to the proper fuel

(L.P. gas or Natural gas) and adjusted to oper-

ate properly. All gas furnaces are manufac-

tured for Natural gas and must be field con-

verted when using L.P. gas.

A warranty certificate with full details is included

with these instructions. However, NORDYNE

will not be responsible for any costs found

4

necessary to correct problems due to improper

setup, improper installation, furnace adjust-

ments, improper operating procedure on the

part of the user, etc.

Some specific examples of service calls which

cannot be included in warranty payments are:

1. Converting the furnace to use another type

of gas.

2. Repairing duct work in the home found to be

faulty.

3. Correcting wiring problems in the electrical

circuit supplying the furnace.

4. Resetting circuit breakers, blown fuses or

other switches.

5. Correcting problems due to improper gas

supply pressure to the furnace.

6. Providing instructional training on how to

light and operate the furnace.

7. Furnace problems caused by installation of

an air conditioner, heat pump or other air

comfort devices.

8. Adding a Roof Jack extension because of

unusual wind and/or snow conditions.

9. Revising installation of the furnace flue as-

sembly (Roof Jack).

10. Adjusting or calibrating of thermostat.

11. Any construction debris which falls into flue

system.

Electrical Supply - 120 volts, 60HZ, 1 Ph.

Fuse or Breaker - 15 amps

Temperature Rise - 45° to 75°F

High Altitude - See Table 11. For Canadian

High Altitude (2,000’ to 4,500’), reduce the

gas manifold pressure to 3.0” W.C. for

natural gas and to 8” W.C. for LP gas.

Thermostat Circuit - 24 volts, 60HZ, 30 vac

Normal Anticipator Setting - 0.4

Manifold Pressure - Natural Gas: 3.5” w.c.

LP Gas: 10” w.c.

*Blower capacity only - needs relay box for AC

Table 2. M1 Furnace Specifications

Furnace Input Output Orifice No E.S.P. Pilot Ignitor Comb. Motor A/C Ready

Model No MBtu/h MBtu/h Nat. LP In WC Burner Direct Blower Hp Tons

M1GH 056 56 45 29 45 0.3 x 1/8 2*

M1GB 056 56 45 29 45 0.3 x 1/4 3

M1GC 056 56 45 29 45 0.3 x 1/2 4

M1GD 056 56 45 29 45 0.3 x 3/4 5

M1GH 070 70 57 24 42 0.3 x 1/5 2½*

M1GB 070 70 57 24 42 0.3 x 1/4 3

M1GC 070 70 57 24 42 0.3 x 1/2 4

M1GD 070 70 57 24 42 0.3 x 3/4 5

M1GH 077 77 62 21 40 0.3 x x 1/4 3*

M1GB 077 77 62 21 40 0.3 x x 1/4 3

M1GC 077 77 62 21 40 0.3 x x 1/2 4

M1GD 077 77 62 21 40 0.3 x x 3/4 5

M1GH 090 90 72 17 36 0.3 x x 1/4 3*

M1GB 090 90 72 17 36 0.3 x x 1/4 3

M1GC 090 90 72 17 36 0.3 x x 1/2 4

M1GD 090 90 72 17 36 0.3 x x 3/4 5

M1MA 056 56 46 29 45 0.3 x x 1/8 2

M1MB 056 56 46 29 45 0.3 x x 1/4 3

M1MC 056 56 46 29 45 0.3 x x 1/2 4

M1MD 056 56 46 29 45 0.3 x x 3/4 5

M1MA 070 70 57 24 42 0.3 x x 1/5 2½

M1MB 070 70 57 24 42 0.3 x x 1/4 3

M1MC 070 70 57 24 42 0.3 x x 1/2 4

M1MD 070 70 57 24 42 0.3 x x 3/4 5

M1MB 077 77 62 21 40 0.3 x x 1/4 3

M1MC 077 77 62 21 40 0.3 x x 1/2 4

M1MD 077 77 62 21 40 0.3 x x 3/4 5

M1MB 090 90 72 17 36 0.3 x x 1/4 3

M1MC 090 90 72 17 36 0.3 x x 1/2 4

M1MD 090 90 72 17 36 0.3 x x 3/4 5

M1BA 066 66 53 26 43 0.3 x x 1/5 2½

M1BB 066 66 53 26 43 0.3 x x 1/4 3

M1BC 066 66 53 26 43 0.3 x x 1/2 4

M1BB 086 86 68 18 37 0.3 x x 1/4 3

M1BC 086 86 68 18 37 0.3 x x 1/2 4

M1SA 066 66 54 .50 Gph 0.3 x 1/5 2½

M1SB 066 66 54 .50 Gph 0.3 x 1/4 3

M1SC 066 66 54 .50 Gph 0.3 x 1/2 4

M1SB 086 86 71 .65 Gph 0.3 x 1/4 3

M1SC 086 86 71 .65 Gph 0.3 x 1/2 4

Burner Model

AF-10 Nozzle

Spray Angle

80° A

5

Carefully review these responsibilities with your

manufactured housing dealer, service com-

pany or gas supplier so there will be no misun-

derstanding at a later time.

! CAUTION:

• Never attempt to alter or modify this

furnace or any of its components.

• Never attempt to repair damaged or

inoperable components. Such action

could cause unsafe operation, explo-

sion, fire and/or asphyxiation.

• If a malfunction has occurred, or if

you feel that the furnace is not oper-

ating as it should, contact a qualified

service agency or gas utility for as-

sistance.

4.INSTALLATION STANDARDS

Installer shall be familiar with and comply with all

codes and regulations applicable to the instal-

lation of these heating appliances and related

equipment. In lieu of local codes, the installation

shall be in accordance with the current provi-

sions of one or more of the following standards.

Table 3. Field Installation Blower Assemblies

Figure 1. Overall Dimensions

“A”- 56"

23 3/4"

“B”- 76"

19 3/4"

“A” Model-

w/o Coil Cabinet

“B” Model-

w/Coil Cabinet

Removable access

panel should be

installed above

furnace door frame

to access roof jack

Nearest

Wall or

Partition

18"

(457 mm)

6" (152 mm)

Top Clearance

0" Side

Clearance

to Furnace

Cabinet

6" (152 mm)

Top Clearance

0" Side

Clearance

to Furnace

Cabinet

Provide min. 235

sq. in. (1516 cm )

open free area in

front or side wall

2

or

In closet

door

located

at top,

center

or bottom

CLOSET DOOR

6" (152 mm)

Top Clearance

Provide min. 250

sq. in. (1613 cm )

open free area in

front or side wall

2

a fully

louvered

door may

be used

CLOSET DOOR

6"

(152 mm)

1"

(25 mm)

0" Side

Clearance

to Furnace

Cabinet

or

in closet

door

Figure 4. Special 1” Clearance

Figure 3. Closet Installation

Figure 2. Alcove Installation

A/C Capacity

Blower Wheel Motor-Hp Ton

903773 10 x 8 1/4 2, 2½ & 3

903413 11 x 8 1/2 2, 2½, 3 & 4

903414 11 x 8 3/4 2, 2½, 3, 4 & 5

Part No. Blower / Motor Assembly

6

ALL MODELS CLOSET ALCOVE

Front 6" 18"

Back 0" 0"

Sides 0" 0"

Roof Jack 0" 0"

Top 6" 6"

Top and Sides of Duct 0" 0"

Bottom of Duct

B Cabinet 0" 0"

A Cabinet (w/ coil box) 0" 0"

A Cabinet (w/o coil box) 1/4" 1/4"

Table 4. Minimum Clearances Figure 5. Non-Platinum

Supply Duct System

A Single trunk duct

BDual trunk duct

w/crossover connector

C

Transition duct

w/branches

a. Federal Manufactured Home Constructions

& Safety Standard (H.U.D. Title 24, Part

3280.707[a][2])

b. American National Standard (ANSI-119.2/

NFPA-501C) for all recreational vehicle in-

stallations.

c. American National Standard (ANSI-Z223.1/

NFPA-54) and/or CAN/CGA B149 for all gas-

fired furnace models.

d. American National Standard (ANSI-Z95.1/

NFPA-31) and/or CSA B139 for all oil-fired

furnace models.

e. American National Standard (ANSI-C1/

NFPA-70) and/or CSA 22.1 Canadian Elec-

tric Code Part 1 for all electrical field wiring.

f. Units have been investigated under stan-

dards UL 307A & B, UL727-1999, ANSI

21.47a - CAN/2.3a - 1995, and CSA B140.10.

5.UNIT LOCATION

The furnace shall be appropriately located to

the supply and return air distribution system.

(See “AIR DISTRIBUTION”, Page 8) Sides and

back of the furnace may be enclosed by wall

framing. (See “Minimum Clearances,” Table 4,

and Figures 2 through 5.)

The furnace installation is only intended for free

air return through the furnace door louvers. DO

NOT connect a ducted return air system di-

rectly to the furnace. Improper installation may

create a hazard and damage equipment, as well

as void all warranties.

Furnace may be installed on combustible floor-

ing when using NORDYNE Duct Connectors

(see Section 10).

When installed in a residential garage, the fur-

nace must be positioned so the burners and the

source of the ignition are located no less than

18 inches above the floor and protected from

physical damage by vehicles.

6.MINIMUM CLEARANCES

This heating appliance must be installed with

clearances not less than the minimums shown

in Table 4. This heating appliance must be

installed with ample clearance for easy access

to the air filter, blower assembly, burner assem-

bly, controls, and vent connections.

a. Alcove installations (see Figure 2): minimum

18" clearance at front of furnace shall be

provided for future servicing. A removable

access panel should be installed between

top of the furnace door frame and the ceiling.

b. Closet installations must use a louvered door

having a minimum free area of 235 sq. in.

when located 6" from furnace (See Figure 3)

or 390 sq. in. for 5 ton ready M1 furnaces. For

special clearance between 1" and 6", re-

quirements are a louvered door with a mini-

mum of 250 sq. in. free area, with the open-

ings in the closet door in line with the louvered

openings in the furnace door . A fully louvered

closet door may be used (See Figure 4 and

section 7.i. to evaluate compliance with this

requirement).

7.RETURN AIR PROVISIONS

U.S.A. home manufacturers shall comply with

all of the following conditions to have acceptable

return air systems for closet installed forced air

heating appliances:

! CAUTION:

HAZARD OF ASPHYXIATION: Nega-

tive pressure inside the closet, with

closet door closed and the furnace

blower operating on high speed, shall

be no more negative than minus 0.05

inch water column.

7

ROOF JACK

SLANT DECK

FLASHING

PITCHED

ROOF

CEILING

CEILING CAVITY

ROOF OPENING

CEILING OPENING

"X" (SEE TABLE 6)

S O T 27 45 -5

S= SLAT FLASHING

F= FLAT FLASHING

O= TYPE; STANDARD

H= HIGH WIND

A= ARCTIC ROOF JACK

T= TRANSIT

MODE

TYPE

MIN. ADJ.

LENGTH

MAX. ADJ.LENGTH

5 = 5" FLUE DIA.

MODEL APPROX. ADJ.

NUMBER LENGTHS*

BELOW FLASHING

FO1323 -5 13" - 23"

FO2343 -5 23" - 43"

SO1835 -5 18" - 35"

SO2447 -5 24" - 47"

SO3263 -5 32" -63"

SO4895 -5 48" - 95"

SOT2442 -5 24" - 42"

SOT2745 -5 27" - 45"

SOT4581 -5 45" - 81"

FOT2846 -5 28" - 46"

Table 5. Roof Jack Assemblies

a. Regardless of the location, the return air

opening into the closet shall not be less than

specified in the appliance’s listing.

b. Means shall be provided to prevent inadvert-

ent closure by a flat object placed over the

return air opening when it is located in the floor

of the closet (versus the vertical front or side

wall).

c. The cross-sectional area of the return duct

system leading into the closet, when located

in the floor or ceiling shall not be less than 235

square inches (or 390 square inches for 5 ton

ready M1 Furnaces).

d. The total free area of openings in the floor or

ceiling registers serving the return air duct

system must be at least 235 sq. in. At least

one register should be located where it is not

likely to be covered by carpeting, boxes and

other objects.

e. Materials located in the return duct system

must have a flame spread classification of

200 or less. This includes a closet door if the

furnace is in a closet.

f. Noncombustible pans having 1" upturned

flanges are located beneath openings in a

floor duct system.

g. Wiring materials located in the return duct

system shall conform to Articles 300-22 of

the National Electrical Code (ANSI C1/NFPA-

70).

SSAW T27 47 - 2

AW= ALL WEATHER

FLASHING

PITCH/12" RISE

0=FLAT

2=2.5/12

4=4/12

MIN. ADJ.

LENGTH

F=

S=

FLAT FLASHING

SLANT FLASHING TYPE:

BLANK=NON-TRANSIT

T= TRANSIT MODE

MAX. ADJ.

LENGTH

FLUE STEEL TYPE

A= ALUMINIZED

S=STAINLESS

All Weather Roof Jack Assemblies

Approx. Length

Model Number Below Flashing

(F,S)AW(T)1523-(0,2,4)(A,S) 15" - 23"

(F,S)AW(T)2135-(0,2,4)(A,S) 21" - 35"

(F,S)AW(T)2747-(0,2,4)(A,S) 27" - 47"

(F,S)AW(T)3563-(0,2,4)(A,S) 35" - 63"

(F,S)AW(T)5195-(0,2,4)(A,S) 51" - 95"

Figure 6. Roof Jack Assemblies

ROOF JACK

SLANT DECK

FLASHING

PITCHED

ROOF

CEILING

CEILING

CAVITY

ROOF

OPENING

"X" (SEE TABLE 1)

Flue Pipe

Combustion

Air Pipe

56" or 76"

Furnace

"A"

"B"

Figure 7. Example of Flat Jack

with Flashing

Figure 8. Example of 2½/12 Slant Jack

with Flashing

5/12 ROOF SLOPE

2

SLANT DECK

/12

12

R

OOF JACK WITH

2

F

LASHING

/12 SLANT

12

8

b. F=Flat Flashing; flexes from 0/12 to 1/12 roof

slope.

c. S=Slant Flashing. 2.5/12 Slope flexes from 1/

12 to 4/12 roof slope, 4/12 flexes from 3/12

to 5/12.

d. Stainless steel roof jacks are available.

e. If the roof jack crown is covered or blocked

with snow, the furnace will not operate prop-

erly. If the home is located in regions where

snow accumulation exceeds 7” (HUD

snowload zones) use an external roof jack

extension p/n 901937.

f. M1 furnaces may be used with roof jacks as

tall as 170” (except M1M 056 & M1B 066

models, which are limited to 120”). An internal

roof jack extension (p/n 901935 - 10”, p/n

903107 - 18”) can be used to increase roof

jack height. All connections inside the home

must be made below the ceiling.

These extensions are available as optional

accessories and may be purchased through

your NORDYNE distributor.

h. Gas piping is not run in or through the return

duct system.

i. Test the negative pressure in the closet with

the air-circulating fan operating at high speed

and the closet closed. The negative

pressure is to be no more negative than

minus 0.05 inch water column.

j. Air conditioning systems may require more

duct register and open louver area to ob-

tain necessary airflow. Use NORDYNE’s

certiduct program to determine proper duct

size for A/C.

8.AIR DISTRIBUTION SYSTEMS

For proper air distribution, the supply duct

system must be designed so that the static

pressure measured external to the furnace

does not exceed the listed static pressure

rating shown on the furnace rating plate.

Location, size, and number of registers should

be selected on the basis of best air distribution

and floor plan of the home.

!

CAUTION:

HAZARD OF ASPHYXIATION: Do not

cover or restrict return air opening.

9.ROOF JACK SELECTION

Note: Install only Roof Jack Assemblies listed

in Table 5 on this heating appliance.

a. Determine depth of ceiling cavity from center

of roof opening to center of ceiling opening.

(See Dimension “A” in Figure 6.)

b. Determine ceiling height and subtract height

of furnace. (See Dimension “B” in Figure 6.)

c. Add dimensions A + B (and X from Table 6 and

Figure 7 if slant deck flashing is used). The

total length of (A + B + X) must be within the

minimum and maximum range of one of the

Roof Jacks listed in Table 5.

APPLICATION NOTES:

a. FAW, FAWT, SAW and SAWT Series Roof

Jacks with a 5" diameter inner vent pipe may

be used with all models of M1 Series gas and

oil furnaces.

Table 6. Slant Deck Flashings

Table 7. Floor Cavity Sizes

Optional Deck Flashings for Flat and 2.5/12 Pitch

Roof Jacks.

(4/12 Pitch Roof Jacks not applicable.)

USE SLANT DECK

IF ROOF PITCH IS: FLASHING NO. "X" FACTOR IS:

"F Series Roof Jack

2" in 12" 903893 (2.5/12) 2-1/8"

2-1/2" in 12" 903893 (2.5/12) 2-1/2"

3" in 12" 903894 (3/12) 2-7/8"

3-1/2" in 12" 903894 (3/12) 3-1/4"

4" in 12" 903895 (4/12) 3-5/8"

"S" Series Roof Jack (2.5/12 Pitch only)

4-1/2" in 12" 903895 (2.5/12) 2-1/8"

5" in 12" 903895 (2.5/12) 2-1/2"

5-1/2" in 12" 903894 (3/12) 2-7/8"

6" in 12" 903894 (3/12) 3-1/4"

6-1/2" in 12" 903895 (4/12) 3-5/8"

English Metric (mm) Finger Tab Screw Down

7/8" 22 901987 904008

2" 51 901988 904009

4-1/4" 108 901989 904010

6-1/4" 159 901990 904011

8-1/4" 210 901991 904012

10-1/4" 260 901992 904013

12-1/4" 311 901993 904014

Use Duct Connector

Model Part Number:

If "X"

(

Floor Cavit

y)

is:

9

10. DUCT CONNECTOR SELECTION b. Select appropriate model from Table 7

which matches X-dimension of the floor

cavity. To maximize air delivery, re-

move reducer “C” (see Figure 11) to

obtain the largest open area that will fit

the duct/floor construction. Screw down

duct connector opening to duct without

reducer is 13” x 13”. With reducer it is

13” x 10-1/8”.

Figure 10.

Figure 9.

13 1/4"

10 1/4"

19”

19"

Top View

of

Finger Tab

Duct

Connector

x

SUPPLY AIR DUCT

FLOOR CAVITY

(depth equal to "X" in Figure 11 and Table 7)

Figure 11.

XSEE

TABLE 7

REDUCER

*FELT-SEAL

SPACERS

C

*OPENING TO DUCT

WITH PLATE (C) REMOVED

OPENING BECOMES

13-1/4” x 13-1/4”

*INDICATES FINGER TAB DUCT CONNECTOR ONLY

PLATINUM SERIES

a. For Platinum ready construction use

the 14” round duct connector, p/n:

903896.

NON-PLATINUM SERIES

a. Determine depth of floor cavity from

surface of floor to top of supply air duct

(See Figure 9).

10

Figure 12. Closet or Alcove

CEILING AND ROOF

OPENINGS

C

L

C

L

13-1/2"

10"

23 -1/4"

FLOOR

OPENING

C

L

C

L

A

LT. FUEL

L

INE HOLES

SIDE WALL

REAR WALL

FUEL LINE

HOLE

FLOOR CUT-OUT

FOR DUCT CONN.

CEILING

CUT-OUT FOR

FLUE AND

ROOF JACK

(See Fig 12)

C

L

C

L

C

L

C

L

24"

23-1/4"

21-3/4"

14-1/2"

2-1/4"

2-3/4"

20"

14-1/2"

13-1/2"

FURNACE OUTLINE

FLOOR CUT-OUT

FOR OPTIONAL

COOLING COIL

FOR NON-PLATINUM

SERIES UNITS

10"

12-7/8"

14-3/4"

15-1/2"

1-1/4" D.

ALT FUEL-LINE

ENTRY FURNACE

OUTER DOOR

REAR WALL OF CLOSET OR ALCOVE

FUEL-LINE

1-3/4"

2"

3/4"

Figure 13. Cut-Out Locations

11

11. INSTALLATION

Required floor, ceiling, and roof cut-out open-

ings must be carefully located to avoid misalign-

ment of the furnace and Roof Jack (see Figures

12 & 13). Installation procedures are suggested

for typical furnace installations and need not be

followed in the exact listed sequence.

CUT OUT FLOOR OPENING & FUEL LINE

HOLE

a. Determine center of closet or alcove (Figure

13).

b. Locate center of the floor opening, measured

10" from the rear wall, and mark cut-out

measuring approximately 14-1/2" by 14-1/2"

(± 1”) for model duct connector used (refer

to Figures 10 & 11).

c. Locate center of fuel line hole, measured 23-

1/4" from the rear wall and 6-5/8" to the left of

center of the floor cut-out (See Figure 12) or

5-1/4" to the left of center of the floor cut-out,

or for entry through right-side of furnace

measured 9" to the right of center of the floor

cut-out.

d. Cut out floor opening and one fuel line hole.

! IMPORTANT:

Refer to the installation instructions

provided with optional air conditioning

packages when installing furnaces with

optional cooling coil cabinet or with

optional C***-series indoor coils.

CUT OUT CEILING AND ROOF OPENINGS

a. Locate center of Roof Jack opening, mea-

sured 13 1/2" from the rear wall of closet or

alcove along the center line of furnace and

floor opening. (See Figure 13)

Figure 15. Duct Connector

Figure 14. Mounting Plate

REAR WALL

MOUNTING

PLATE

FLOOR

OPENING

FUEL

LINE

HOLES

SUPPLY AIR DUCT

CUT DUCT OPENING

1/16TH. LARGER THAN

DUCT CONNECTOR

REAR WALL

SUPPLY AIR DUCT

FUEL

LINE

HOLES

MOUNTING

PLATE

FLOOR

OPENING

UNDER DUCT OPENING

Non-Platinum Series Platinum Series

DUCT

CONNECTOR

MOUNTING

PLATE

SCREWS

FUEL

LINE

HOLES

14” SUPPLY

CONNECTION

12

Figure 16. Installation of Duct Connector

b. Cut ceiling and roof holes as follows:

Ceiling Hole = 8-3/4" (222 mm) diameter

Roof Hole = 9-3/8" (238 mm) diameter

c. DO NOT ALLOW DEBRIS TO FALL INTO

THE FURNACE. THIS COULD CAUSE

UNSAFE OPERATION AND VOIDS THE

FURNACE WARRANTY. Use the top cap

that comes with the furnace packaging (or

alternate protector) to prevent debris from

falling into the furnace before the final roof

jack connection is made.

CUT DUCT OPENING (FINGER TABBED

ONLY)

a. Place duct connector through the floor open-

ing with bottom tabs resting on top of the

supply air duct.

b. Center duct connector and push back against

rear edge of floor opening.

c. Mark cut-out location (tab area) and remove

duct connector.

d. Cut out duct opening 1/4" larger than area

marked.

INSTALL FURNACE MOUNTING PLATE

a. Place mounting plate (supplied within duct

connector) at rear of the floor opening (See

Figure 15).

INSTALLING PLATINUM SERIES 14” ROUND

DUCT CONNECTOR

a. Place duct connector through the floor open-

ing. (See Figure 15).

b. Secure duct connector to floor.

INSTALLING SCREW DOWN DUCT CON-

NECTOR

a. Apply a bead of caulking, mastic, or other

approved sealant around bottom side of 1/2”

flange and restrictor plate, when applicable.

b. Locate the duct connector over duct and

carefully lower screw down duct connector

into place.

c. Once duct connector is located on duct,

temporarily hold in place while fastening duct

connector to the floor using flat head screws

or nails. Be sure flanges of duct connector

stay in contact with the duct.

d. Screw plenum to duct making sure a seal is

made between the duct and the duct connec-

tor. Additional screws may be added if re-

quired.

e. Cut away duct along edge of flange allowing

the center to drop into the duct. Remove

section of duct with caution, as edges will be

sharp.

INSTALLING FINGER TABBED DUCT CON-

NECTORS

a. Place duct connector through the floor open-

ing with bottom tabs extending through the

duct opening. (See Figure 15)

b. Secure duct connector to floor.

c. Bend bottom tabs under and up tightly against

the supply air duct (See Figure 16).

NOTE: The duct connector is designed for use

on ducts 12" in width. When using the connector

on 12" wide ducts, there may be insufficient

clearance to bend the tabs on two sides of the

duct connector. In such cases the tabs may be

attached to the sides of the duct by using sheet

metal screws or other suitable fasteners. (See

Figure 17).

If sealant, mastic, or tape is used to provide a

better seal, it should be approved by applicable

national or local codes.

ALTERNATE ATTACHMENT METHODS

This procedure may also be used to install a

furnace duct connector to narrow metal

ductwork where insufficient clearance prevents

Duct

Duct Connector

Narrow Duct

Figure 17.

TABS

TABS

DUCT

DUCT

1. INSERT DUCT CONNECTOR INTO

DUCT CUT-OUT.

2. BEND BOTTOM TABS OVER

AND ONTO THE UNDERNEATH

DUCT SERVICE.

13

Staple Folded Duct

Flap (typ) to side of Duct

Connector

Duct

STEP 4.

STEP 1.

"A" "A"

"B"

"B" Cut- Out

Area"A"

Cut- Out

Area "A"

Fold Back Flap "B"

Fold Back Flap "B"

Top of Duct

"A" "A"

STEP 2.

"B"

"B"

Fold Back Flap"B"

Cut

Lines Duct

Fold Back Flap"B"

STEP 3.

Bend Duct Connector Tabs Up

and Over- (along length of duct)

Duct

Flap "B"

Duct

Figure 18.

bending of the duct connector tabs at the

side(s) of the duct. (See Figure 18).

1. Score and cut the top of the metal duct as

indicated in Step 1 or Step 2. With Step 1

choice, also cut out the metal from the shaded

area “A”.

2. Fold the duct flap “B” up, (See Step 3).

3. At the front-to-back of duct run (Area “A”),

bend the duct tabs and secure them directly

to the duct.

4. At Area “B”, bend the duct tabs up and back

over, around the duct connector, (See

Step 3).

5. Fold/form the duct flap against the side of the

duct connector and attach as shown, (See

Step 4). Use three (3) staples (minimum) on

each duct flap OR, if a 2X block/joist is not

provided, use two (2) sheet metal screws

(minimum) on each duct flap. An alternate

attachment method is acceptable, as long as

the duct connector is securely attached.

6. Tape the duct flap edges with an approved

tape for a leak-free joint.

INSTALL FURNACE

a. Remove furnace outer door(s) and bottom

fuel line knockout.

b. Place furnace onto duct connector and cen-

ter with floor opening.

c. Slide onto mounting plate. (Bottom rear slots

on furnace should engage with mounting

plate tabs.)

d. Secure front with one (1) fastener at each

corner (See Figure 19 or 20).

NOTE: Additional fasteners may be used at

rear, sides or through door frame, as desired,

to secure furnace to closet or alcove framing.

INSTALL ROOF JACK

Apply caulking compound on underside of roof

flashing to form a continuous strip at least 3/8"

wide (see Figure 21) around the underside of

the perimeter of the flashing. Connect Roof

Jack Assembly to the furnace. Insert telescop-

ing Roof Jack Assembly through the opening

cut on the roof. Connect flue pipe to flue collar

of furnace. Connect combustion air pipe to

furnace collar with sheet metal screw (See

Figure 22). It is recommended that the connec-

tion of the combustion air pipe to the furnace be

made before the flashing is secured to the roof

to maintain alignment of roof jack and furnace

connections.

NOTE: For replacement furnaces, be sure the

inner flue pipe connects over the furnace vent

collar. DO NOT use a smaller diameter inner

flue pipe which could slide inside the fur-

nace vent collar and restrict the flow of

furnace flue products.

Attach Roof Flashing: If necessary, shift roof

flashing slightly in the roof opening so that

assembly is in good alignment with furnace.

Press down firmly over caulking on roof flashing

to make the seal with roof water tight. Secure

flashing with appropriate fasteners. As an

14

MTG. PLATE TABS SLIDE FURNACE

ALL THE WAY BACK

ONTO MTG. PLATE

SUPPLY AIR DUCT

Knockout Over Holes

SECURE FURNACE

WITH 2 FASTENERS AT FRONT

CORNER HOLES

SUPPLY AIR DUCT

FUEL

LINE

HOLES

MTG. PLATE TABS SLIDE FURNACE

ALL THE WAY BACK

ONTO MTG. PLATE

SECURE FURNACE

WITH 2 FASTENERS

AT FRONT CORNER HOLES

Figure 19. “A”, “B”, & Platinum

Cabinet Furnaces

Figure 20. “A” Cabinet Furnace on 911969

Coil Cabinet (Non-Platinum Series)

added protection against leaks, coat the flash-

ing plate and fasteners with approved roofing

compound.

If flashing mounted on 12 degree angle is used

it may be necessary to adjust the angle to match

the roof pitch; (1/12 - 4/12 maximum).

12. INSTALLATION OF TRANSIT-

MODE VENTING SYSTEM

MANUFACTURED HOME FACTORY

a. Furnace to be installed per furnace installa-

tion manual.

b. Roof Jack to be selected from Table 5 of

these instructions.

c. Roof Jack (less upper Roof Jack crown),

with weather cap to be installed as described

under Install Roof Jack.

d. Upper Roof Jack crown to be stored in a

prominent location inside manufactured home

until on-site installation.

e. The four warning tags supplied must be

installed as follows:

• To weather cap

• To fuel line connection point (Gas) or

furnace burner (Oil)

• To furnace flame observation door (Gas

or Oil)

• To furnace wall thermostat

MANUFACTURED HOME SITE

a. Transit-mode weather cap to be removed

and upper Roof Jack crown installed (See

Figure 24).

b. Place upper Roof Jack (crown) on to the flue

pipe assembly. Be sure inside flue pipe

attaches over inner flue pipe. Be sure outer

Roof Jack pipe fits over outer pipe. Secure

in place using three (3), #10, 1/2" sheet metal

screws removed in step #a. Do not use the

same holes which secured the rain cap in

place.

Secure Roof Jack with

appropriate fasteners

after connecting to

furnace

Ceiling

Caulk under roof

flashing to prevent

water leakage

Roof

Optional #901943

Ceiling Trim Ring

or #902521

2-piece Ceiling Ring

Figure 21. Flat Roof

Ceiling

Caulk under roof

flashing to prevent

water leakage

Secure flashing

with appropriate

fasteners

Secure lower roof

jack section with

no. 10 S.M. screws

Roof

Upper Roof

Jack Section

Optional

Slant-Deck

Flashing

Figure 23. Pitched RoofFigure 22.

15

c. Venting system warning tags to be removed

and discarded.

!

WARNING:

Failure to properly secure the flue pipe

to the furnace may result in fire, explo-

sion or asphyxiation when operating

the furnace.

13. ELECTRICAL WIRING

Refer to the wiring diagram in these instructions

or affixed to the inside of the control box cover

for the wiring of your particular unit.

ELECTRICAL BRANCH SUPPLY CIRCUITS.

Route all electrical wiring to the left side of the

furnace. For installation of “A” Cabinet fur-

naces, allow sufficient slack in the wiring if an

optional cooling coil cabinet is added at a later

time.

Use of copper conductors is recom-

mended.

! WARNING:

Any attempt to operate furnace before

replacing transit-mode weather cap

with upper roof jack section may re-

sult in hazard of fire, explosion or as-

phyxiation.

Power supply circuit to the furnace must be

installed and grounded in accordance with the

National Electrical code (ANSI-C1/NFPA-70),

or Canadian Electric Code Part 1 (CSA 22-1)

and all local codes having jurisdiction.

CONNECT POWER SUPPLY WIRES

a. Remove the furnace control panel cover.

b. Insert 115 volt wires through the strain relief

on the left side of the furnace control box (see

Figure 25).

c. Connect the “hot” wire to the BLACK pigtail

lead, and the “neutral” wire to the WHITE

pigtail lead. Secure all connections with

suitable wire nuts.

d. Connect the “ground” wire to the grounding

screw.

e. Reinstall the control panel cover and secure

with the original mounting screws.

CONNECT THERMOSTAT WIRES

a. Insert 24 volt wires through the plastic grom-

met just above the control panel.

b. Connect the thermostat wires to the furnace

low voltage pigtails (see Figure 25).

c. Connect low-voltage circuit to the wall ther-

mostat.

d. A hole may be made in the furnace cabinet to

ease thermostat wiring. Make sure that the

wiring is protected from the sharp edge of the

added hole.

NOTE: The thermostat should be installed 4 to

5 feet above the floor on an inside wall which is

relatively free from direct sources of heat or

SCREWS

COMPLETED

ASSEMBLY

TO FURNACE

UPPER ROOF

JACK (CROWN)

INNER FLUE

PIPE

FLUE ASSEMBLY

OUTER PIPE

FLASHING

WEATHER CAP

Figure 24.

16

If the heat anticipator is set too low, the furnace

may cycle frequently and not provide comfort

to the homeowner.

14. FUEL PIPING

Sizing and installation of fuel lines must be in

accordance with federal, state and local regu-

lations. All piping shall be black iron pipe, or

equivalently sized steel tubing. Internally tinned

copper tubing may be used for gas supply

systems.

Fuel line installations other than typical installa-

tions shown in Figures 26 and 27 must comply

with the fuel piping provisions stated in the

Federal Manufactured Home Standard (H.U.D.

TITLE 24, PART 280) and the National Fuel Gas

Code (ANSI-Z223.1/NFPA-54).

a. Optional fuel inlet lines are available for all gas

furnace models to permit the addition of a 1/

2" F.P.T. shut-off valve above the floor.

NOTE: Shut-off valve must be designed and

listed for use with liquid petroleum (L.P. gas).

The gas supply to your home will either be

Natural Gas or L.P. (bottle gas). Your furnace

is factory equipped to operate on Natural Gas.

If your gas supply is L.P. (bottle gas), you must

contact a qualified serviceman or gas supplier

to convert the furnace. The necessary instruc-

tions for the gas conversion are found on the

lighting instruction label attached to the furnace

in Section 16, Service Guide.

cold drafts. The nominal anticipator setting is

0.4. (Refer to the thermostat literature for addi-

tional information.)

Five-conductor thermostat wire is recom-

mended for 24 volt low-voltage circuit (2-wire is

required for furnace only; 5-wire for heating and

optional cooling systems).

For Platinum-ready Construction:

a. Use a heat/cool thermostat.

b. Run thermostat wire from the Thermostat to

the Furnace (see Figure 39).

c. Using thermostat wire with at least two wires

(four wire is recommended), run thermostat

wire from the Furnace to the intended loca-

tion of the Platinum-series unit. Leave at least

six feet of extra thermostat wire at the in-

tended location for future hook-up. Coil re-

maining six feet of wire and attach to the

home’s undercarriage.

Once the furnace is installed check the thermo-

stat anticipator against the nominal setting of

0.4:

1. Connect the milliamp meter in series with one

of the gas valve’s low voltage terminals.

2. Energize the gas valve.

3. Read the value of the milliamps.

4. Adjust the heat anticipator of the thermostat

to the value read on the milliamp meter.

If the heat anticipator is set too high, the furnace

may delay in coming on.

Figure 25. Control Panel (All Models)

To Combustion

Blower or

Flame Roll-Out

Switch

Thermostat Wires

Blower

Plug

On-Off

Switch

On-Auto

Switch

(Heating

Models Only)

To Gas Valve

or Burner

Power

Entry

Furnace

Control Box

17

Table 8. Thermostat Wire Gauge

To Gas

Supply

Floor

Control

Panel

On-Off-Fan

Switch

Alt. Fuel

Line Entry

Floor Cavity

Figure 26. Typical Gas Piping

For natural gas operation, the furnace is de-

signed for 7" W.C. inlet pressure. Pressure is

reduced to 3-1/2" W.C. by the pressure regu-

lator in the gas valve. The maximum inlet

pressure for the valve is 13” W.C.

For L.P. gas, pressure to the gas valve must

be more than 11" W.C. but not more than 13"

W.C. Pressure is reduced to 10" W.C. by the

pressure regulator in the gas valve.

! CAUTION:

The furnace must be converted by a

qualified technician. Improper conver-

sion can cause unsafe operation, ex-

plosion, fire and/or asphyxiation.

Oil Tank and Piping Installation

The following procedures are recommended

as good practice. However, requirements of

local codes and ordinances, H.U.D. Manufac-

tured Home and Safety Standards or National

Fire Protection Association must be satisfied,

where they apply, for an approved installation.

Use a tank capacity suitable for the application

with a weatherproof, capped fill opening and a

shielded vent to let in air as fuel is used. The tank

must be clean inside before filling. All water, rust,

sediment and other foreign matter must be

flushed out.

A fuel or tank gauge is recommended for easy

checking of the fuel level. Check the gauge

reading with a dipstick.

Locate the storage tank conveniently near the

home. For above ground fuel tank installations,

the tank may rest three to four inches off the

T’STAT

Wire Gauge

2-Wire 5-Wire

(Heating) (Heating/Cooling)

24 55 25

22 90 45

20 140 70

18 225 110

Recommended T’STAT Wire

Len

g

th

(

Unit to T’STAT

)

18

Figure 27. Typical Oil Piping for Above Ground (Single-Line) Supply

If fuel pump fails to lift oil, check for air

port plug and repeat priming procedure.

leaks and tighten all fuel fittings. Re-

prime fuel pump by injecting fuel oil into

optional (top) return port. Replace return

R

Top of Tank

8 ft.

Shut-off

Valve

Optional

Fuel

Filter

Alternate

Fuel Line

Entry

Optional

Return

Pressure

Gauge Port

Nozzle

Port

Inlet

Port

Air-Bleed

Valve

Return Port &

Internal By-Pass

Optional

Inlet

Control

Panel

Oil

Furnace

On-Off-Fan

Switch

Floor Cavity

Oil-Gun

Burner

Floor

Flue Gas

Sampling

Hole

Drain

End of Oil Supply Line

3" to 5" Above

Bottom Drain

Guide pipe

Gauge

Vent with

Cap 2" Duplex

Bushing

2" Fill

3/8" Oil Supply Line

Note: Additional venting

may be required if tank

is filled rapidly.

19

ground. Fuel tanks may also be buried if prop-

erly coated to resist corrosion. For below ground

fuel tank installations, the vertical dimension

from the bottom of the fuel tank to the fuel pump

must not exceed ten feet. Keep the tank filled,

especially in the summer to reduce the accu-

mulation of condensation.

Fuel Line Hook-Up: One Line System

The one line system is highly recommended

where vertical lift, from bottom of tank to pump,

is not more than eight feet. A single line hookup

has the advantage of costing less and giving

quieter operation.

Fuel Line Hook-Up: Two Line System

Use a two line system only if the vertical lift

exceeds 8 feet.

1. Install the oil feed line as outlined in steps 1-

6 below.

2. Install the oil pump bypass plug in the bottom

return port.

3. Run the return line up through the furnace

base to the return port of the pump. Run the

other end of the line to the tank, using 3/8”

O.D. copper tubing or 1/4” pipe with the ends

capped, and routing the line so it stays clean.

4. Insert the return line through the second

opening in the duplex bushing. If the bottom

of the tank is lower than the pump intake, the

tube should be inserted three or four inches

from the tank bottom. If the bottom of the tank

is higher than the pump intake, the return line

should extend not more than 8” inside the

tank.

If a two pipe system is used or if oil is taken from

the bottom of the tank, a filter is recommended.

Hook-Up Procedure (See Figure 27)

1. Use a 3/8” O.D. copper tubing for the fuel line.

Cap the end with tape to keep out dirt while

the line is being routed.

2. Install duplex bushing for two 3/8” lines in the

top fitting of the tank.

3. Insert one end of the tubing through the

duplex bushing until it is three to five inches

from the bottom drain. Tighten the bushing.

4. Run the line where it will not be subject to

damage. Also, make bends gradually and

avoid kinks which might restrict oil flow.

5. Open the furnace door. Connect the oil line

to the intake port on the pump. Tighten other

port plugs on the pump.

6. Be sure oil line is airtight! Air leaks can cause

the pump to lose prime and will create other

problems such as nozzle failure, odors, rum-

bling noise, and false safety shutdown.

7. Insert the short length of the copper tube level

with the bottom of the duplex bushing. Form

the tube into an inverted “U” to serve as a

vent.

How to Eliminate Air Leaks

To eliminate problems caused by air in the oil

line, all connections in the oil supply line and all

plugs, nuts, and fittings on the pump must be

airtight. This includes the nut that covers the

pressure adjustment. It is important that the

hook-up be done carefully and with a good

flaring tool.

To assure continuous operation, use a wire to

jump terminals T-T (or F-F) on the primary

control while burner is running. If furnace is

equipped with the Honeywell R7184 primary

control, priming oil pump procedure is as fol-

lows:

1. While the ignition is on, press, for 1/2 second

or less, and release the reset button. The

lockout time will be extended to 4 minutes.

2. If prime is not established within the 4 min-

utes, the control will lock out. Press the reset

button to reset the control.

3. Repeat steps “1” and “2”, if needed, until the

pump is fully primed.

When oil flow is clear and free of air bubbles,

close air-bleed valve and tighten. (Time to bleed

air out will vary depending on length of oil line,

number of bends, etc.)

Fuel Oil Type

Do not use fuel oil heavier than Grade No. 2.

Grade No. 1 may be used where the oil supply

is subject to low temperatures.

DO NOT USE GASOLINE, CRANKCASE OIL,

OR ANY OIL CONTAINING GASOLINE.

! WARNING:

Failure to keep supply of oil clean by

various procedures described above

may cause failure of certain compo-

nents such as the fuel pump gears,

check valve, shaft seal, or burner

nozzle which may result in a burner

fire.

20

15. FLUE GAS SAMPLING

It may be necessary to take flue gas sampling

from oil and gas gun furnaces (M1S and M1B

Series Models) in order to check the perfor-

mance after furnace installation. A flue gas

sample may be taken from the heat exchanger,

which is located behind the hole of the top-front

of blower compartment.

1. STOP! Read the SAFETY INFORMATION.

2. Turn off all electric power to the appliance.

3. Remove the black plastic cap located above

the blower and save.

4. Through the top of the blower compartment

hole, drill a hole for your sampling tube into the

heat exchanger.

5. Insert sampling tube through the drilled hole.

6. After a complete check and adjustment of

furnace performance, fill the drilled hole with

a screw that is larger than the hole.

7. Put silicon sealant (rated at least 500° F)

around the screw.

8. Plug the outside hole with the plastic cap you

removed in step 3.

! WARNING:

If you do not follow these instructions

exactly, a fire or explosion may result

causing personal injury, loss of life, or

property damage.

16. LIGHTING AND SHUTDOWN

GENERAL-ALL MODELS

Read the safety information on the front page of

these installation instructions before lighting

furnace. DO NOT ATTEMPT TO LIGHT

FURNACE IF YOU SMELL GAS.

SAFETY INFORMATION

FOR YOUR SAFETY READ BEFORE LIGHT-

ING.

a. The first lighting of the furnace after any

home setup must be performed by a

qualified service technician.

b. If this appliance has a pilot that must be lit by

hand, follow these instructions exactly.

c. BEFORE LIGHTING smell all around the

furnace for gas. Be sure to smell next to the

floor because some gas is heavier than air

and will settle on the floor.

d. WHAT TO DO IF YOU SMELL GAS: Do not

try to light any appliance. Do not touch any

electric switch and do not use any phone in

your building. Immediately call your gas

supplier from a neighbor’s phone. Follow the

gas supplier’s instructions. If you cannot

reach your gas supplier, call the fire depart-

ment.

e. Use only your hand to push in the gas control

lever. Never use tools. If the lever will not

push in by hand, don’t try to repair it. Call a

qualified service technician. Force or at-

tempted repair may result in a fire or explo-

sion.

f. Do not use this furnace if any part has been

under water. Immediately call a qualified

service technician to inspect the furnace and

to replace any part of the gas valve or control

system which has been under water.

LIGHTING INSTRUCTIONS FOR STAND-

ING PILOT MODELS.

a. Stop! Read the safety information.

b. Set the thermostat to the lowest setting.

c. Turn off all electric power to the appliance.

d. Push in the gas control lever slightly and

move left to “OFF.” DO NOT FORCE.

e. Wait ten (10) minutes to clear out any gas.

If you then smell gas, STOP! Follow step “d”

in the SAFETY INFORMATION. If you don’t

smell gas, go to the next step.

f. Find pilot - follow metal tube (pilot tube) from

gas control valve. Open hinged fire obser-

vation door. The pilot is found at the end of

the pilot tube just left of the pilot shield.

g. Slightly depress the gas control lever and

move it right to the “ON” position and release;

then move it to the “PILOT” position.

h. Move the control lever to “SET” and hold.

Immediately light the pilot with a match.

Continue to hold the control lever for about

one (1) minute after the pilot is lit. Release the

lever and it will spring back to the “PILOT”

position. Pilot should remain lit. If it goes out,

repeat steps “d” through “h” above. If the

lever does not spring back when released,

stop and immediately call your service tech-

nician or gas supplier. If the pilot will not stay

lit after several tries, move the gas control

lever to “OFF” and call your service techni-

cian or gas supplier.

i. Move the gas control lever left to “ON”.

j. Turn on all electric power to the furnace. Set

the thermostat to “Heat” and/or the desired

temperature setting. Set the On-Off-Fan

switch to “ON”.

k. Replace the furnace door.

21

Gas Control Lever

Pilot Adjustment

Figure 28. Standing Pilot Valve

Figure 29. Lighting Furnace

Pilot

Bracket

! WARNING:

Close hinged fire door. If fire door is

open or spring is broken it may allow

products of combustion into the living

space by the furnace blower resulting

in possible asphyxiation.

In the event of any flashback or explosion,

immediately shut off the furnace and call your

service technician.

TO TURN OFF GAS TO APPLIANCE:

a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance at

breaker or fuse box, before servicing.

c. Remove the furnace door.

d. Push in the gas control lever slightly and

move to the left to “OFF.” DO NOT FORCE.

e. Replace the furnace door.

SEQUENCE OF OPERATION FOR STAND-

ING PILOT

a On a call for heat, the thermostat contacts

close, supplying 24 VAC to the gas valve.

b. When the gas valve is energized it steps

open at a reduced flow and opens fully after

approximately 14 seconds.

c. When the call for heat is satisfied the thermo-

stat contacts open, the gas valve shuts off

gas flow.

SEQUENCE OF OPERATION FOR STAND-

ING PILOT W/INDUCED DRAFT BLOWERS

MODELS

a. On a call for heat, the thermostat contacts

close, supplying 24 VAC to the relay.

b. The relay contacts close and energize the

induced draft motor.

c. When the inducer starts, the air pressure

switch closes at -0.20”WC differential pres-

sure and energizes the gas valve.

d. When the gas valve is energized it steps

open at a reduced flow and opens fully after

approximately 14 seconds.

22

e. When the call for heat is satisfied the thermo-

stat contacts open, the gas valve shuts off

gas flow, and the induced draft blower stops.

GENERAL-DIRECT IGNITION MODELS

Read safety information on front page of these

installation instructions before operating fur-

nace. DO NOT ATTEMPT TO OPERATE

FURNACE IF YOU SMELL GAS.

Operating instructions for

M1M — MODELS WITH DIRECT IGNITION:

a. STOP! Read the SAFETY INFORMATION.

b. Set the thermostat to the lowest setting.

c. Turn off all electric power to the appliance.

d. This appliance is equipped with an ignition

device which automatically lights the burner.

Do not try to light the burner by hand.

e. Honeywell - push in the gas control knob and

turn clockwise to “OFF.” Robertshaw - push

the gas control lever to “OFF.” NOTE: The

lever cannot be placed in the “OFF” position

unless it is pushed in slightly. DO NOT

FORCE (See Figures 30 & 31).

f. Wait ten (10) minutes to clear out any gas. If

you smell gas, STOP! and follow step “d” in

the SAFETY INFORMATION section. If you

do not smell gas, go to the next step.

g. Set the On-Off switch to the “ON” position.

h. Honeywell - turn knob on gas control counter

clockwise to “ON.” Robertshaw - push the

gas control lever to “ON.”

i. Turn on all electric power to the appliance.

j. Replace the furnace door.

k. Set the thermostat to “HEAT” and the desired

temperature setting. The furnace should light

after approximately 75 seconds. If the appli-

ance will not operate, follow the instructions

“To Turn Off Gas To Appliance” and call your

service technician or gas supplier.

In the event of any flashback or explosion,

immediately shut off the furnace and call your

service technician.

TO TURN OFF GAS APPLIANCE:

a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance

before servicing unit.

c. Set the ON-OFF switch to “OFF.”

d. Honeywell - push in the gas control knob and

turn clockwise to “OFF.” Robertshaw - push

the gas control lever to “OFF.”

e. Replace the furnace door.

SEQUENCE OF OPERATION FOR M1M

MODELS WITH DIRECT IGNITION

Direct ignition model furnaces do not have a

pilot. Ignition is accomplished automatically by

a silicon carbide hot surface ignitor. A control

module takes care of all timing functions. After

lighting, the control module uses the ignitor as

a flame sensor, shutting off gas should the flame

go out. There are no external relays or timing

devices.

Do not try to light this furnace manually.

The control module is not field serviceable.

a. On a call for heat, the thermostat contacts

close, supplying 24 VAC between terminals

“C” and “W” of the control module, which

starts combustion motor.

b. When the inducer starts, the air pressure

switch closes at -0.20”WC differential pres-

sure and energizes the control.

c. After a 45 second purge period, the ignitor is

energized for a 30 second warm-up period,

after which the gas valve opens.

d. The trial period for ignition is approximately 6

seconds, after which the gas valve either

Gas Control

Figure 31. Direct Ignition

Gas Valve - Robertshaw

Figure 30. Direct Ignition

Gas Valve - Honeywell

GAS CONTROL KNOB

23

remains open if flame is sensed, or closes if

flame is not sensed.

e. If flame is not sensed, the entire sequence is

repeated four more times before “lockout”

occurs. To reset, wait 30 seconds and then

interrupt the 24 VAC power by turning the

room thermostat below room temperature,

then returning it to the original set point.

f. If flame is not established on the fifth trial for

ignition (initial try + 4 re-tries), the control de-

energizes the gas valve, flashes “4” on the

Status LED, and lockouts out heat operation

for 1 hour.

g. If a flame is present, the control energizes the

main blower on heat speed 30 seconds after

the gas valve opens.

h. When call for heat is satisfied the thermostat

contacts open, the gas valve shuts off gas

flow and the combustion blower remains on

for a 30 second post-purge period.

i. The main blower is de-energized after a 120

second blower off delay.

! WARNING:

FOR YOUR SAFETY; 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.

• Immediately call your gas supplier

from a neighbor’s phone. Follow the

gas supplier’s instructions.

• If you cannot reach your gas sup-

plier, call the fire department. Should

overheating occur or the gas supply

fail to shut off, disconnect the power

at the main circuit breaker and then

see “To Turn Off Gas To Appliance.”

OPERATING INSTRUCTIONS FOR

OIL AND GAS GUN FURNACE:

Oil Gun Model

M1 oil gun furnaces may be converted to gas

gun in the field by using the proper conversion

kit listed in the RPL.

If your furnace model number begins with M1S*,

the furnace is equipped with an ignition device

which automatically lights the burner.

Do not try to light this furnace manually

.

a. Open all valves in the oil line.

b. Be sure the fire door is closed.

c. Set the On-Off switch to “ON”.

d. Set the thermostat to the desired setting.

SEQUENCE OF OPERATION FOR

OIL GUN MODELS

Oil Furnace - Honeywell R7184 Control

1. When a call for heat is initiated, there is a 2-

6 second delay while the control performs a

safe start check.

2. The ignition and motor are turned on and a

flame should be established within the 15-

second lockout time. NOTE: Burner will

prepurge for 15 seconds if equipped with

R7184B Control.

3. If flame is not sensed within the 15-second

lockout time, the control shuts down on

safety lockout and must be manually reset.

If control locks over three times in a row, the

control enters restricted lockout. To reset,

hold down the reset button for 30 seconds

until the LED flashes twice.

4. Once flame is established, the ignition re-

mains on 10 seconds to ensure flame stabil-

ity. It then turns off.

5. The circulating air blower will energize after

the temperature fan switch closes.

6. The furnace runs until the call for heat is

satisfied.

7. The circulating air blower will de-energize

when the temperature fan switch opens.

! WARNING:

If furnace still does not light, turn the

furnace off (described above) and call

your technician. In the event of any

flashback or explosion, immediately

shut off furnace and call your service

technician.

Gas Gun Models

M1 gas gun furnaces may be converted to oil

gun in the field by using the proper conversion

kit listed in the RPL.

If your furnace model number begins with M1B*,

the furnace does not have a pilot. Ignition is

24

accomplished automatically by a silicon car-

bide hot surface ignitor. A control module takes

care of all lighting and timing functions. There

are no external relays or timing devices.

Do not try to light this furnace manually.

The control module is not field serviceable.

1. Before operation, smell all around the fur-

nace for gas. Be sure to smell next to the

floor because some gas is heavier than air

and will settle on the floor. If you smell gas,

STOP! and follow the safety instructions

below. If you don’t smell gas, go to the next

step.

2. Set the thermostat to the lowest setting.

3. Turn off all electric power to the appliance.

4. This appliance is equipped with an ignition

device which automatically lights the burner.

Do not try to light the burner by hand.

5. Honeywell - push in the gas control knob

and turn clockwise to “OFF.” Robertshaw

- push the gas control lever to “OFF.”

NOTE: The lever cannot be placed in the

“OFF” position unless it is pushed in slightly.

DO NOT FORCE (See Figures 30 & 31).

6. Wait ten minutes to clear out any gas. If you

then smell gas, STOP! and follow the safety

information on the preceding page. If you

don’t smell gas, go to the next step.

7. Set the On-Off switch to the “ON” position.

8. Honeywell - turn knob on gas control counter

clockwise to “ON.” Robertshaw - push the

gas control lever to “ON.”

9. Turn on the electric power to the appliance.

10. Set the thermostat to “Heat” and/or the

desired temperature setting. The furnace

should light in approximately 45 seconds.

If the appliance will not operate, follow the

instructions “To Turn Off Gas To Appli-

ance” and call your service technician or

gas supplier.

In the event of any flashback or explosion,

immediately shut off the furnace and call

your service technician.

SEQUENCE OF OPERATION FOR

GAS GUN MODELS

a. On a call for heat, the furnace control begins

an ignition sequence which lasts approxi-

mately 45 seconds.

b. After this sequence, the control module tests

to see if flame is sensed. If it has, the furnace

continues to heat until the thermostat is

satisfied.

c. If the burner has not lit, the ignition sequence

is repeated a maximum of two more times. If

flame is not sensed after three attempts, the

control enters “Lockout” and no further at-

tempts to light the burner will occur. If

“Lockout” occurs, contact a qualified service

technician for assistance.

! DANGER:

Before placing the furnace in service

it must be checked to make sure it is

equipped for the type of gas being

used. The burner flame must also be

observed and adjusted if necessary.

Failure to observe this caution may

result in unsafe operation, explosion

and/or fire, or asphyxiation. See the

following sections “Gas Supply” and

“Combustion Air.”

d. When call for heat is satisfied, the thermostat

contacts open and the gas valve shuts off

gas flow.

TO TURN OFF GAS/OIL APPLIANCE:

a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance

before servicing unit.

c. Set the On-Off Switch to “OFF.”

d. Honeywell - turn gas control knob clockwise

to “OFF” Robertshaw - Push the gas control

lever to “OFF.”

e. For oil, shut off all valves.

f. Replace the furnace door.

THE FURNACE CONTROLS AND FUNC-

TIONS

1. On-Off Switch - This switch turns electrical

power to the furnace on and off. The switch

must be set in the “On” position for the

furnace to operate. For M1G* models, in

warm weather there is a possibility of the

blower coming on periodically or operating

continuously due to a heat buildup within the

furnace by a combination of warm weather

and heat from the pilot. This is normal

operation as long as there is power to the

furnace and the On-Off switch is at the “ON”

position. If blower operation is not desired,

the On-Off switch may be set in the “OFF”

position to cut the electrical power to the

furnace.

25

2. Limit Control - This furnace is protected by

two high temperature safety limit switches.

The auxiliary (upper) limit switch and the high

temperature (lower) limit switch are auto-

matic reset types. If either limit trips, the

burner will shut off. If either limit switch trips

off again soon after resetting, set the furnace

On-Off switch to the “OFF” position and call

your authorized serviceman.

3. Gas Valve - The gas valves for the gas

furnaces are a 100% shut-off type and will fail

safe if for some reason the gas is turned off.

The valve is a “step-open” type for M1G*-

models and “slow-open” for M1M*- and M1B*-

models which means it opens to a “low-fire”

position, and after a few seconds, “steps-

open” to “high-fire.”

4. Roll Out Switch - (M1G* - 056 & 070) The

furnace is protected by a manual reset safety

switch located on the bottom left hand side of

the combustion pipe.

5. Oil Burner Primary Control - The primary

control for oil gun furnaces starts the burner,

monitors a safe operating cycle, and shuts

the burner off at the end of a heating cycle.

The control uses a light sensing transducer

to determine if fuel ignition has been suc-

cessfully attained. If ignition is not attained by

the end of the safety ignition timing period, the

control shuts the burner off and enters “lock-

out.”

6. a. Summer Cooling - (H Series): Your fur-

nace is equipped to operate the circulating

fan only. Turn the Fan On-Auto switch to the

“ON” position during warm weather. The

blower will now operate to circulate air in your

home through the duct system.

b. Summer Cooling - (A, B, C, & D Series):

Your furnace is A/C ready, equipped with A/

C relay and transformer. The unit is equipped

to use a 4-wire thermostat. When using a 5-

wire thermostat, RC and RH should be

jumped (see instructions included with ther-

mostat).

17. SERVICE GUIDE

BURNER ADJUSTMENTS

Burner settings and adjustments are made at

the factory. However, these settings may

change during shipping, handling, and installa-

tion. Therefore the following items should be

checked and readjusted if necessary.

Atmospheric Gas with Standing Pilot and Direct

Ignition Furnaces, Including Gas Gun.

a. Gas Pressure

The gas pressure can be checked with a

manometer at the pressure tap located on

the side of the gas valve. The gas valve

pressure regulator can be adjusted by re-

moving the regulator selector stack and

turning the slotted insert located directly

under the selector stack. The regulator

selector stack must be secured in place

before each pressure reading is taken.

Natural gas manifold pressure should be 3.5"

W.C. and L.P. gas manifold pressure should

be 10" W.C. Replace the gas pressure tap

plug on the gas valve.

b. Pilot Flame (Standing Pilot Only)

The pilot flame can be adjusted by turning the

pilot adjustment screw, located on top of the

gas valve (See Figure 29). The pilot flame

height should be between 3/4” and 1.” The

flame tip should be visible just above the pilot

bracket when viewed through the observa-

tion door. The same pilot orifice is used with

both natural and L.P. gas.

COMBUSTION AIR

In order for the flame to burn efficiently, it must

receive adequate combustion air. The amount

of combustion air required will vary depending

on altitude, actual B.T.U. content of the fuel

being used, gas pressure, conversion to an-

other gas and other factors. The burner flame

should be observed and any necessary adjust-

ments made before the furnace is placed into

service. See Table 9 for Factory Air settings.

Gas Gun

Combustion air box adjustment is made to the

main burner by loosening the two lock nuts on

the plastic air shutter, located on the left side of

the burner blower housing. Air shutter adjust-

ment line is located on the same side of the

blower housing. Turn the plastic shutter to a

smaller number (counter clockwise) for less air

to a larger number (clockwise) for more air.

Table 9. Factory Combustion Air

Settings

Model Nat. Gas LP Gas Oil

66,000 3.5 3.5 3

86,000 5.3 6 5

26

5/32” GAP

ELECTRODE

NOZZLE

0-1/16”

5/16” ABOVE CL

Gently tighten the lock nuts after completing the

adjustment. For best results, use instrument to

measure between 8-9% CO2, after the com-

bustion air has been adjusted. Note: Do not

over-tighten the lock nuts, otherwise the plastic

air shutter may be damaged.

Oil Gun Only

It is recommended that the CO2 and Smoke

levels should be measured for maximum per-

formance. CO2 readings should be 10-11% for

66,000 BTUH furnaces and 12-13% for 86,000

BTUH furnaces. The Smoke should be N0. 0 on

the Bacharach Scale, and 0 to 0.02 negative

draft over fire.

Electrode Setting (Oil Gun Only)

Poor ignition of the oil spray may result if the

electrodes are not adjusted as shown in Figure

32. Do not permit any electrodes to be grounded

to any surface.

Switching the Honeywell R7184 Ignition

Control between Interrupted and Intermit-

tent Duty (Oil Gun Only)

The Honeywell oil primary control can be

switched between interrupted and intermittent

ignition control. To switch from interrupted duty

(Factory set) to intermittent duty, remove the

igniter wire from the blue control wire. Attach the

burner motor and igniter wire to the orange

control wire. Cap and reseal the orange control

wire. Cap and isolate the blue control wire.

! CAUTION:

• Combustion air adjustment must be

made only by a qualified technician.

Improper air adjustment may cause

unsafe operation, explosion and/or

fire asphyxiation.

• If the input to the furnace is too great

because of excessive gas pressure,

wrong size nozzle or orifice, high alti-

tude, etc., the burner flame will be

sooty and can produce carbon mon-

oxide, which could result in unsafe

operation, explosion and/or fire or

asphyxiation.

GAS CONVERSION

This gas fired heating appliance was shipped

from the factory for use with natural gas. How-

ever, the appliance can be converted for use

with LP gas. Use the following procedure for

gas conversion of the burner.

ATMOSPHERIC AND DIRECT IGNITION

FURNACES

a. Follow the instructions to “Turn Off Gas to the

Appliance.”

b. Disconnect the gas pipe union and the elec-

trical wires connected to the gas valve.

c. Remove the pilot tube and thermocouple

from the gas valve (M1G*).

1 3/8”

Figure 32. Oil Gun electrode Position Figure 33. Convertible Pressure

Regulator Cap

PRESSURE

REGULATOR

CAP

M11678

N

A

T

N

A

T

L

P

L

P

N

A

T

N

A

T

OR

OTHER SIDE

OF CAP

Honeywell

Valve

27

d. To remove the gas valve assembly, remove

screw(s) from gas valve bracket. Gas valve

and spud may be removed. Orifice is located

at the end of the spud (M1G*,M1M*),or re-

move three (3) bolts from U-shaped manifold

plate and orifice assembly (M1B*).

e. Replace the main orifice with the L.P. gas

orifice supplied in the envelope located by the

gas valve. Check to insure the orifice size

matches the nameplate.

f. It is not necessary to convert the pilot orifice.

g. For Honeywell gas valves with the regulator

converter (Figure 33), check for the letters

NAT or LP on the pressure regulator cap.

Unscrew the cap, invert it, replace, and

tighten until snug.

h. For the Robertshaw gas valve with the regu-

lator converter (Figure 34), remove the black

cover and unscrew the converter located on

top of the gas valve. Invert the converter.

(For “LP” the red ring will be located at the

bottom and the “LP” stamping on the con-

verter will appear right side up.) Then screw

converter back into the regulator, hand tight

plus 1/8 turn, and replace the black cover

onto the converter top to protect the threads.

i. Reassemble the burner assembly into the

furnace.

j. Reconnect the gas piping and electrical wires

to the gas valve.

k. Open the manual shut-off valve and follow

the FURNACE START-UP procedure as

outlined previously in this manual to put the

furnace into operation.

NOTE: The pilot flame is adjustable by turning

the adjustment screw located on the gas valve

with a small screwdriver. (See Figure 29)

TROUBLESHOOTING - STANDING PILOT

MODELS

Main Burner Does Not Come On

a. Check the electrical supply to the furnace.

b. Be sure the furnace On-Off switch is in the

“ON” position.

c. Check for proper thermostat operation.

d. Check for broken or open thermostat wires.

e. Check to make sure the insulation located on

the inside of the front panel is glued securely

around the fan switch and the limit switch.

f. Shut off the electrical supply to the furnace

and remove the electrical box cover.

g. Check for a defective transformer or blown

fuse.

h. Check electrical circuit for proper grounding,

polarity, and make sure the electrical con-

nections are tight.

i. Check to see if limit switches may have failed

to close.

j. Replace the electrical box cover and restore

electrical power to the furnace. Turn the On-

Off switch to “ON” and raise the thermostat

setting above room temperature.

k. Check for 24 volts at the gas valve.

l. Replace the gas valve if the pilot is estab-

lished and it does not open when powered

with 24 volts.

Gas Valve Powered (24 volts)– No Main

Flame

a. The manual shut-off valve must be on.

b. The pilot flame must be established.

c. The gas valve control lever must be in the

“ON” position.

d. Check gas pressure coming to the gas

valve.

e. Replace the gas valve if the main burner does

not come on under the above conditions.

Pilot Will Not Light or Goes Out

a. Check the incoming gas pressure.

b. Check for the proper pilot orifice. See the

nameplate SPECIFICATION.

c. Check for proper pilot flame adjustment. See

“BURNER ADJUSTMENTS.”

d. Check the thermocouple millivoltage.

• Millivoltage should read between 18 and 30

mv.

• If the closed millivolt reading is not between

18 and 30 mv., the gas valve electromagnet

Figure 34. Convertible Pressure

Regulator

Robertshaw

Valve

28

may be defective. Replace the gas valve if

necessary.

e. Be sure the pilot shield is in place.

f. Check for gas leaks in the pilot line or the pilot

assembly.

g. Check the flue assembly to make sure all

connections are tight.

h. See the FURNACE START-UP procedure

for lighting details.

Main Flame Is Not Burning Properly

a. Check the manifold gas pressure.

b. Check for the correct main burner orifice.

- See the nameplate SPECIFICATION.

Control Module Status Indicators - M1M Series

Control Status

The Red LED labeled “STATUS” is provided to indicate system faults.

Steady ON: Control OK

Steady OFF: No power

Rapid flash: False flame or internal control fault

One flash: Limit switch is open

Two flashes: Pressure switch is open

Three flashes: Pressure switch is stuck closed

Four flashes: Lockout due to failed ignition

Five flashes: L1 neutral reversed or L1 voltage

not present on L1

Flame Status

A Yellow LED labeled “Flame” is provided to indicate flame status. When

flame is sensed, the flame LED is lit. If flame sense is weak, yellow LED

will flash.

Control Module Status Indicator - M1S* Series

The indicator light on the oil primary control provides lockout, recycle,

and cad cell indications as follows:

1. Flashing 1/2 second on, 1/2 second off - system is locked out or

in restricted mode.

2. Flashing 2 seconds on, 2 seconds off - control is in recycle mode.

3. Indicator light is on - cad cell is sensing flame.

4. Indicator light is off - cad cell is not sensing flame.

c. Check the flue for any blockages or loose

connections.

d. Check the combustion air passages for block-

age.

High Gas Bills

a. Be sure the proper orifices are being used.

b. Be sure the return air system is clear and free

of blockage.

c. Be sure the furnace filter is clean.

d. Be sure the home is insulated, that windows

and doors fit tightly, and that there are no

leaks in the heating duct system.

e. Check the room thermostat to be sure the

setting is not higher than necessary. Low

Control Module Status Indicator - M1B

a. One flash-the control is in lock-out because the inducer centrifu

gal switch is or was stuck closed.

b. Two flashes-the control is in lockout because the signal was not

received by the control that the inducer centrifugal switch had

closed within the time.

c. Three flashes-the control is in lockout because a failed ignition

attempt, a gas valve error, or a false flame sensed during the warm

up period. If false flame has been sensed, the control will return to

normal operation, and repeat ignition sequence when the false flame

is not present.

d. Four flashes-the control is in lockout due to a failure within the control

board.

29

humidity requires higher temperatures for

the same level of comfort. Check for proper

humidity level in the home.

TROUBLESHOOTING -

DIRECT IGNITION FURNACES INCLUDING

GAS GUN

Burner Motor Does Not Run—

Thermostat Calls For Heat

a. Check the electrical supply to the furnace.

b. Be sure the furnace On-Off switch is in the

“ON” position.

c. Defective thermostat circuit - white and red

thermostat low voltage leads (M1M*, M1B*

models). If the burner motor or combustion

fan runs, check:

• Thermostat connections

• Thermostat

d. No voltage to control module - determine if 24

volts (or 120 volts) is available to the control

module. If voltage is not available check for:

• Blown fuse, defective transformer, circuit

breaker, no electrical supply.

• Limit switch open.

• Loose connections.

Combustion Blower Does Run - No Flame

a. Defective centrifugal switch (M1B* Model).

• Check the operation of centrifugal switch

by removing end bell of the burner motor.

• Clean contacts of motor.

• If the contacts are closed, replace the

motor.

b. Defective pressure switch (M1M* and M1G*

077, 090 Models) - check air tube and elec-

trical connections.

c. Burner in purge mode - allow 75 seconds for

flame establishing period.

d. Check for proper electrical connections at

purge timer, control box, or gas valve.

e. Check for gas supply - gas line valve on,

control lever on.

Control Module Is Powered—

Ignitor Does Not Heat Up

a. Disconnect ignitor leads at AMP receptacle

and check for 120 volts at the plug during

ignition sequence.

b. Replace ignition control if 120 volts is not

available at AMP plug during ignition se-

quence.

120 Volts Is Available At AMP Plug—

Ignitor Does Not Heat Up

a. Disconnect power to the furnace.

b. Disconnect AMP plug to the ignitor, and

check ignitor resistance with an ohm meter.

Set on RX1 scale.

• Normal reading should be 40 - 75 ohms.

• If above or below this rating at room tem-

perature change ignitor.

c. Check for continuity from ignitor receptacle

to burner.

Main Flame Ignites—

Burner Locks Out

a. Ignition control is not properly grounded.

b. Defective ignition control.

c. Improper polarity of 120 volt power supply.

d. Ignitor has hairline crack.

e. Improper gas pressure or burner air adjust-

ment is not allowing flame to contact ignitor tip

for flame rectification.

f. Misaligned ignitor does not allow flame to

contact ignitor tip for flame rectification.

Burner Short Cycling —-

Thermostat Calls for Heat, Limit Switches

Closed

a. Check for polarity.

b. Check ground.

c. Check flue.

d. Check combustion air.

e. Check gas pressure.

f. Check orifice.

g. Check the position of ignitor, a normal read-

ing should be 40-75 ohms.

24 Volts Supplied To Gas Valve During

Ignition —

No Main Gas Flow

a. Gas valve may be defective. Replace if

necessary.

b. Gas piping may be plugged. Check for

adequate gas supply to gas valve at union.

Burner Operates—

Insufficient Heat

a. Check thermostat for proper setting and

location. Thermostat should not be located

where it will be affected by another heat

source.

b. Check for clean filter and proper air flow.

c. Check burner for proper gas firing rate.

d. Be sure unit is not undersized for its thermal

load.

e. Check thermostat anticipator. The nominal

anticipator setting is 0.4.

Burner Flame Without Motor Running

a. Gas valve stuck open, check gas valve for

proper operation (replace if necessary) and

inspect heat exchanger.

b. Check for 115 volts to the combustion blower

motor; replace if necessary.

30

c. If no power to combustion blower then check

wiring and control module; replace if neces-

sary.

Circulation Air Blower Will Not Operate

Even Though The Burner Does Operate

a. Check thermostat “G” wiring.

b. Check wiring to motor.

c. Check for a defective motor.

TROUBLESHOOTING - OIL GUN

Honeywell R7184 oil gun control only.

Burner does not start with a call for heat.

1. Check the electrical supply to the furnace.

2. Be sure the furnace door switch is in the on

position.

3 Check for line voltage at the oil primary

control. The voltage should be 115 VAC.

4. Check indicator light with burner off, no call

for heat (no flame).

a. If indicator light is on, the cad cell is seeing

stray light or the cad cell or controller is

defective.

b. If indicator light is off, go to step 5.

c. If flashing, refer below (a. Reset primary

control).

5. Jumper T to T terminals on primary control.

a. If burner starts, check thermostat or limit

wiring connections.

b. If burner does not start, turn off power.

Check all wiring connections.

c. If burner does not start, replace R7184

control.

Burner starts, then locks out on safety with

indicator light flashing at

½

second on,

½

second off.

a. Reset primary control.

To reset the control from lockout, the button

needs only to be pressed and released. If it

is in restricted mode, the button should be

held in for 30 seconds (until the light flashes

twice, or until the light stops flashing on

earlier models).

Note: Restricted Mode: If the control

locks out three times in a row without a

complete heat cycle between attempts,

the lockout becomes restricted mode.

1. If indicator light stops flashing and

ignition remains off, primary control

could be defective. If line voltage is

present at the ignitor terminals, but

there is no ignition, the ignitor is probably

defective and needs to be replaced.

2. If indicator light stops flashing, burner

turns on, but control locks out again,

check cad cell if cad cell is Okay,

replace primary control.

3. If indicator light continues to flash at

1/2 second on, 1/2 second off, verify

that control is not in restricted mode. If

restricted mode, reset it. If not in re-

stricted mode, replace R7184.

4. If indicator light stays off while the flame

is on, check cad cell sighting for view

of flame.

5. If burner locks out, check cad cell

resistance. (See Table 10)

6. If burner keeps running, system is

Okay.

7. If indicator light is off, check cad cell

assembly after disconnecting line volt-

age power.

b. Burner will not start, and indicator light is

flashing at 2 second on, 2 second off.

Hold the reset button down for 1-2 second.

If indicator light continues to flash, wait for 60

- 70 seconds. If it still continues to flash,

replace the primary control.

c. To check cad cell resistance.

Press and release the button during the run

mode. The light will flash to indicate the cad

cell resistance. For proper burner operation,

it is important that the cad cell resistance

reaover 1600 Ohms. For cad cell resistance,

see Table 10.

Figure 35. Periodic Cleaning

Table 10. Cad Cell Resistance when

sensing flame

Led Flashes Cad Cell Resistance in Ohms

1 0 - 400

2 400 - 800

3 800 - 1,600

4 >1600

31

! WARNING:

Do not obstruct any return air open-

ings, including the grille on the fur-

nace. To do so may cause the furnace

to activate the high limit and shut down,

or it may cause asphyxiation.

18. MAINTENANCE

By Homeowner

1. Return Air - On some closet installations the

return air opening to the furnace may be on

the floor, on the door, on the side wall of the

closet, or some combination of these. The

upper grille on the front of the furnace admits

return air to the blower. Return air must be

provided back to the circulating blower in

order to provide air distribution.

2. Filters - At least twice each season (more

often in dusty areas) remove and clean the

air filters with a vacuum or with warm water

and soap. Reinstall when dry. Also clean

dust and lint around furnace and in the fur-

nace vestibule. (Figure 35.)

3. Seasonal Service Information - During ex-

tremely cold weather, ice may form on the

furnace roof jack. Small amounts of ice form-

ing on the roof jack will present no problems

to proper furnace operation. Excessive ice

formation could restrict the combustion air

supply to the burner, causing inefficient

burner operation. If excessive ice has formed

on the air inlet or exhaust portions of the roof

jack, it must be carefully removed (Figure

36).

By Serviceman

All furnaces need periodic service at the begin-

ning of each heating season. Call your service-

man to:

a. Remove the air circulator and clean all dust

and lint from the unit with a stiff bristle brush.

b. Inspect the combustion chamber blower

compartment, flue collar and Roof Jack.

c. Check the gas valve (if applicable) and fuel

line connections for leaks.

d. Make any adjustments necessary for good

operation.

! WARNING:

Use of furnace or air conditioning com-

ponents that are not included in the

certification of this appliance may cre-

ate a hazard, invalidate the certifica-

tion, and in many states, make instal-

lations illegal. Listed NORDYNE air

conditioning components are speci-

fied on the furnace label.

ADDITIONAL OIL

FURNACE MAINTENANCE

In addition to the preceding, the following should

be performed by a qualified service contractor

at least once each season for oil-fired furnaces:

a. Replace the oil nozzle with the type nozzle

specified for your furnace.

b. Clean, adjust and replace if necessary the

spark electrodes.

c. Reset the nozzle/drawer assembly to fac-

tory specifications.

d. Clean the inside of the furnace heat ex-

changer and replace the combustion liner if

necessary.

e. Clean or replace the oil filter element at the oil

tank.

f. Adjust the burner for top efficiency and check

to make sure all fittings are leak-tight.

19. OPTIONAL ACCESSORIES

Necessary when the Furnace is Used with

Some Central Air Conditioners

If an air conditioner is installed that does not use

the furnace blower for air distribution and that

operates independently of the furnace, the

thermostat system must have an interlock to

prevent the furnace and air conditioner from

operating at the same time. This interlock sys-

tem usually contains either a “Heat-Cool” switch

which must be turned to the “Heat” or “Cool”

position to activate either heating or cooling

operation, or a positive “OFF” switch on the

cooling thermostat.

Figure 36. Roof Jack

Check for

Ice Here

32

Figure 39. Thermostat Wiring A/C Ready Models

Figure 37. Coil Cavity Damper (Non-Platinum Series Only)

Figure 38. Damper without Coil Cavity (Non-Platinum Series Only)

Rc

R

H

W

G

Y

Red

White

Green

Yellow

Red

White

Green

Grey

**

Thermostat M1* A/C Ready

Furnace

Route Thermostat wire to intended Platinum

Series AC/HP location. Coil and secure extra

six feet of wire to home's undercarriage.

Platinum Ready Wiring

Rc

R

H

W

G

Y

Red

White

Green

Yellow

Red

White

Green

Grey

**

Thermostat M1* A/C Ready

Furnace

Standard Wiring

33

Table 11. A/C Blower Selection

Blower Speed Selection Chart for M1*C Models and

for use with Blower Kit No. 903413 1/2 Hp 4 Speed

Heating Cooling Speed/ Evap Coil

Speed 2-1/2 Ton

Furnace Input Setting & 3 Ton

077, 086, 090 ML L ML MH H

056, 066, 070 L L ML MH H

2 Ton 4 Ton

3-1/2

Ton

Blower Speed Selection Chart for M1*D Models and

for use with Blower Kit No. 903414 and 903890

3/4 Hp 4 Speed

Heating Cooling Speed/ Evap Coil

Furnace Input Speed 2-1/2 Ton 3-1/2 Ton

Setting & 3 Ton & 4 Ton

077, 086, 090 ML L ML MH H

056, 066, 070 L L ML MH H

2 Ton 5 Ton

The furnace must also be equipped with an

automatic damper (See Figures 37 or 38,

NORDYNE p/n 901996 for furnaces without coil

cavity, or p/n 901083 with coil cavity) to prevent

cold air from being discharged up around the

heat exchanger. Cold air may cause conden-

sation inside the heat exchanger which can lead

to rust and early failure.

OPTIONAL ADD-ON AIR CONDITIONING

Ask your dealer or contractor about NORDYNE

add-on central air conditioning systems. There

is a split-system or package air conditioner

designed for your total comfort needs. Whether

split system or single package, an energy-

saving NORDYNE unit is available that has

been designed specifically for manufactured

housing applications and can best handle your

home comfort needs.

Listed and ARI Certified, all models are pro-

tected by the NORDYNE Air Conditioner Lim-

ited Warranty.

Platinum series units are self contained pack-

age units with compressor and cooling coils.

They are designed as a drop in system when

used with the AC ready M1.

Single package unit includes cooling coils, com-

pressor, and vertical discharge fan. This type

of unit connects with the existing home air duct

system (an optional close-off damper is re-

quired with the furnace).

Split system unit with vertical discharge for quiet

operation connects with NORDYNE cooling

coil furnace (optional coil cavity required with

“A” model furnaces).

Blower Speed Selection Chart for M1*B Models and

for use with Blower Kit No. 903773 1/4 Hp 3 Speed

Heating Cooling Speed/ Evap Coil

Furnace Input Speed

Setting

086, 090 H L M H

066, 070, 077 M L M H

056 L L M H

2 Ton 3 Ton

2-1/2

Ton

34

20. WIRING DIAGRAMS

703887B

Figure 40. Gas Atmospheric Furnace, M1GH 056, 070 Models

Gas Atmospheric Furnaces, M1GH 056, 070

ON/OFF

SWITCH

GAS VALVE

FAN SWITCH

HI-LIMIT

AUX. LIMIT

TRANSFORMER

L1 N

CR 24 V

115 V

WHITE

WHITE

WHITE

GRAY

BLUE

BLACK

GRAY

FAN ON/AUTO SWITCH

ORANGE

ORANGE

BLACK

L1

NEUTRAL

GROUND

SCREW

FURNACE ELECTRICAL BOX

BLACK

3A FUSE

BLOWER

MOTOR

HEATING

ONLY

654321

C

R

W

GRAY

RED

BLUE

CONNECTOR

HOUSING CAP

COMMON

FOR OPTIONAL

ACCESSORY KITS

BLACK

BLACK

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

RED

NOTES

1. Incoming power must be polarized. Observe

color coding. (See furnace data label for

electrical information.)

2. If any of the original wires (as supplied with

the appliance) must be replaced, use 105˚C

Thermoplastic type wire or its equivalent.

BLACK

BLACK

SUPPLIED

BY INSTALLER

BLUE

WHITE

MANUAL RESET

VENT SWITCH

35

703888C

Figure 41. Standing Pilot with Induced Draft Furnace, M1GH 077, 090 Models

152

364

GAS VALVE

FAN

SWITCH

HI-LIMIT

AUX. LIMIT

PRESSURE

SWITCH

COMBUSTION

FAN

L1 N

CR 24 V

115 V

BLACK

BLACK

BLACK

BLUE

BLACK

WHITE

WHITE

WHITE

WHITE

GRAY

GRAY

BLUE

BLUE

21

GRAY

SUPPLIED BY

INSTALLER

FAN ON/AUTO

SWITCH

BLUE

BLACK

ORANGE

ORANGE

L1

NEUTRAL

GROUND

SCREW

FURNACE ELECTRICAL BOX

3A FUSE

BUSHING

RED

C

R

W

ON/OFF

SWITCH

CONNECTOR

HOUSING CAP

BLACK

BLACK

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

GRAY

RED

WHITE

BLACK

BLACK

BLACK

TRANSFORMER

BLOWER

MOTOR

HEATING

ONLY

654321

BLACK

BLACK

NOTES

1. Incoming power must be polarized. Observe

color coding. (See furnace data label for

electrical information.)

2. If any of the original wires (as supplied with

the appliance) must be replaced, use 105˚C

Thermoplastic type wire or its equivalent.

Standing Pilot With Induced Draft Furnaces,

M1GH 077, 090 Models.

36

710150 08/00

Figure 42. Gas Atmospheric Furnace, A/C Ready, M1G (B, C, D) 056, 070 Models

RED (LOW)

BLACK (HIGH)

BLUE (MED. HI)

ORANGE (MED. LO)

152

A/C

BLOWER

RELAY

364

ON/OFF

SWITCH

GAS VALVE

FAN

SWITCH

HI-LIMIT

AUX. LIMIT

TRANSFORMER

L1 N

CR 24 V

115 V

BLACK

ORANGE

BLUE

ORANGE

GREEN

WHITE

WHITE

WHITE

BLACK

GRAY

BLUE

BLUE

BLACK

VENT SWITCH

BLUE

FURNACE ELECTRICAL BOX

L1

NEUTRAL

GROUND SCREW

C

R

G

W

HEATING/COOLING

RED

RED

(SEE NOTE)

TIE WIRE

CONNECTOR

HOUSING CAP

BLUE

GRAY

3A FUSE

GRAY

RED

654321

WHITE

SUPPLIED

BY INSTALLER

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

NOTES

1. Incoming power must be polarized. Observe color

coding. (See furnace data label for electrical

information.)

2. If any of the original wires (as supplied with the

appliance) must be replaced, use 105˚C

Thermoplastic type wire or its equivalent.

BLOWER

MOTOR

4 SPEED

BLACK

BLACK

GRAY

GREEN

WHITE

MANUAL RESET

*

*M1G(C,D) Heating - replace orange wire with red wire (low speed)

M1GB 070 Heating - replace orange wire with blue

A/C & Heating Speeds: Refer to Table 10, A/C Blower Selection in the manual

NOTE: To run at same speed in both heating and cooling mode,

remove wire from either terminal 4 or 6 on the relay, then attach

jumper to terminals 4 and 6.

HEATING/

COOLING

654321

RED (LOW)

BLACK (HIGH)

BLUE (MED. HI)

WHITE

3 SPEED

BLOWER

MOTOR

37

Figure 43. Standing Pilot with Induced Draft Furnace, A/C Ready M1G (B, C, D) 077, 090 Models

152

A/C

BLOWER

RELAY

364

152

COMBUSTION

BLOWER

RELAY

3

64

ON/OFF

SWITCH

GAS

VALVE

HI-LIMIT

AUX. LIMIT

TRANSFORMER

PRESSURE

SWITCH

COMBUSTION FAN

L1 N

CR 24 V

115 V

BLACK

BLACK

BLACK

BLACK

BLACK

ORANGE

ORANGE

GREEN

WHITE

WHITE

WHITE

WHITE

GRAY

GRAY

BLUE

BLUE

21

GRAY

L1

NEUTRAL

GROUND

SCREW

FURNACE ELECTRICAL BOX

RED

BLACK

BLUE

TIE WIRE

HEATING/

COOLING

BLUE

C

R

G

W

FAN

SWITCH

BLUE

RED* CONNECTOR

HOUSING

GRAY

3A FUSE

GREEN

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

HEATING/COOLING

654321

RED (LOW)

BLACK (HIGH)

BLUE (MED. HI)

ORANGE (MED. LO)

WHITE

BLOWER

MOTOR

4 SPEED

CONNECTOR

HOUSING CAP

SUPPLIED

BY INSTALLER

* Jumper Wire - M1GB 090 Units Only

Otherwise Hi-Speed Connected

to Blower Relay (Black)

- M1GB 077 Heating: Orange wire

replaced by Blue

- M1GB 090 Heating: Orange wire

replaced by Black

GRAY

RED

GREEN

WHITE

BLACK

BLACK

RED

NOTES

1. Incoming power must be polarized.

Observe color coding. (See furnace

data label for electrical information.)

2. If any of the original wires (as supplied

with the appliance) must be replaced,

use 105˚C Thermoplastic type wire or

its equivalent.

654321

RED (LOW)

BLACK (HIGH)

BLUE (MED. HI)

WHITE

3 SPEED

BLOWER

MOTOR

A/C & Heating Speeds: Refer to

Table 10, A/C Blower Selection

in the manual

710151 08/00

38

See Table

BLOWER

MOTOR

SINGLE

SPEED

ON/OFF

SWITCH

C

R

G

W

GAS VALVE

HI-LIMIT

AUX. LIMIT

TRANS-

FORMER

PRESSURE

SWITCH

654321

654321

COMBUSTION FAN

L1 N

CR

24 V

115 V

21

1

4

5

2

6

3

1

2

3

4

5

6

7

8

9

IGNITOR

BLUE

BLUE

BLACK

GREEN

YELLOW

YELLOW

BLACK

BLACK

ORANGE

ORANGE

BLACK WHITE

L1

NEUTRAL

GROUND SCREW

FURNACE ELECTRICAL BOX

24V

NEU

C

H

L1

XFRM

TIE

WIRE

See Table

CONNECTOR

HOUSING CAP

GROUND

SCREW

BLACK

BLACK

CONTROL LIGHT STATUS

RED YELLOW

Steady ON Control OK Steady ON Good Flame Signal

Steady OFF No power Blinking Weak Flame Signal

Rapid Flash False flame or internal control fault Steady OFF No Flame Signal

1 Flash Limit switch is open

2 Flashes Pressure switch is open with inducer on

3 Flashes Pressure switch is closed with inducer off

4 Flashes Lockout due to failed ignition

5 Flashes 115 vac & neutral reversed or no ground

CONTROL

LIGHTS

RED

Jumper must be removed if

converting to a multispeed blower.

Jumper is required for M1MA

models and M1MB 090

A/C & Heating Speeds: Refer to

Table 10, A/C Blower Selection

in the manual

BLACK

WHITE

WHITE

BLACK

BLACK

GREEN

RED

GRAY

WHITE

RED (LO)

BLACK (HIGH)

BLUE (MED. HI)

ORANGE (MED. LO)

WHITE

RED (LO)

BLACK (HIGH)

BLUE (MED. HI)

WHITE

654321

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

BLOWER

MOTOR

4 SPEED

NOTES

1. Incoming power must be polarized. Observe color

coding. (See furnace data label for electrical

information.)

2. If any of the original wires (as supplied with the

appliance) must be replaced, use 105˚C Thermoplastic

type wire or its equivalent.

SUPPLIED

BY INSTALLER

C W G R

COM

BLUE

BLOWER

MOTOR

3 SPEED

See Table

See Table

710152 07/01

Figure 44. Gas Direct Ignition Furnace, Heating & A/C Ready - All M1M Models

Blower Wire Table

Blower Wire Connections

Furnace Wire #1

Wire #2 Wire #3 Wire #4

Model Red

Black Blue Orange

M1MA 056/

Tie Tie Tie Control

070/077/090

Wrapped Wrapped Wrapped

Board "H"

M1MB

Tie Control Tie Control

056

Wrapped Board "C" Wrapped Board "H"

M1MB

Tie Tie Control Control

070/077

Wrapped Wrapped Board "H" Board "C"

M1MB

Tie Control Tie Tie

90

Wrapped Board "H" Wrapped Wrapped

M1M(C,D)

Control Tie Tie Control

056/070

Board "H" Wrapped Wrapped Board "C"

M1M(C,D)

Tie Tie Tie Control

077/090

Wrapped Wrapped Wrapped Board "H"

39

7104670 04/04

Figure 45. Gas and Oil Furnaces, A/C Ready - M1 (B, S) 066, 086 Models

152

A/C

BLOWER

RELAY

364

FAN

SWITCH

HI-LIMIT

AUX. LIMIT

TRANSFORMER

L1 N

CR 24 V

115 V

BLACK

GREEN

WHITE

WHITE

WHITE

GRAY

BLUE

GRAY

BLUE

BLACK

BLACK

CRW

BLUE

BLACK

ORANGE

ORANGE

L1

NEUTRAL

GROUND

SCREW FURNACE

ELECTRICAL BOX

RED

TIE WIRE

WHITE

RED 3A FUSE

GRAY

RED

GREEN

WHITE

654321

654321

RED (LO)

BLACK (HIGH)

BLUE (MED. HI)

WHITE

4 SPEED

BLOWER

MOTOR

SINGLE

SPEED

BLOWER

MOTOR

C

R

G

W

ON/OFF

SWITCH

BUSHING

BUSHING

BLACK

RED

(SEE NOTE 3)

RECEPTACLE

NOTES

1. Incoming power must be polarized. Observe color coding

(See furnace data label for electrical information.)

2. If any of the original wires (as supplied with the appliance) must

be replaced, use 105˚C Thermoplastic type wire or its equivalent.

3. On models M1(B,S)A and M1(B,S)086 jumper wire is installed.

On all other models, cooling speed is connected to black wire.

4. A/C & Heating Speeds: Refer to Table 10, A/C Blower Selection

in manual.

5 If any of the original wire supplied with the appliance is replaced, use

105˚C wire or equivalent.

6. Use copper conductors only.

LEGENDS

115V: FIELD 115V:

24V: FIELD 24V:

GRAY

RED

GREEN

CONNECTOR

HOUSING CAP

BLACK

BLACK

LINE CORD

T1

T2

F1

F2

FROM 'R' WIRE (RED)

FROM 'W' WIRE (BLUE)

CAD CELL

PRIMARY CONTROL

BLACK

BLACK

IGNITION MODULE

BURNER MOTOR

BLACK

WHITE

VIOLET

BLACK

WHITE

VIOLET

WHITE

R7184B

PRIMARY

CONTROL

SUPPLIED

BY INSTALLER

BLACK

654321

RED (LO)

BLUE (MEDHI)

BLACK (HI)

WHITE

3 SPEED

BLOWER

MOTOR

ORANGE (MED LO)

NL1

BURNER ELECTRICAL BOX

GAS VALVE

IGNITER

GREEN

BLUE

BLUE

BLACK

WHITE

RED

RED

RED

BLACK

GROUND SCREW

BLACK

BLACK

RED

RED

BLACK

BLACK

GRAY

GV

PSO

FSG

C

IND

L1

HSI

HSIG

L2

W

PSI

FSI

CONTROL

MODULE

TERMINAL HOUSING

BUSHING

LINE CORD

(ITEM #12)

TERMINAL

BUSHING

BUSHING

BUSHING

BUSHING

WC

ITEM #10

(TYP. 5)

FROM "C"

WIRE - GRAY

BLACK

BLACK

FROM "W"

WIRE - BLUE

GAS GUN BURNER

ORANGE

WHITE

SOLENOID

VALVE

BLUE

BLUE

OIL GUN BURNER

¢708672;¤

7086720

O’Fallon, MO

7086720 (Replaces 708074E)

Specifications and illustrations subject to change

without notice and without incurring obligations.

Printed in U.S.A. (12/06)

INSTALLER: Please leave

these installation instructions

with the homeowner.

21. EQUIVALENT ORIFICE SIZES AT HIGH ALTITUDES

(Includes 4% Input Reduction for Each 1,000 Feet)

Reference Sources: ANSI Z233.1 & NFPA 54, National Fuel Gas Code.

For Canadian high altitude (2,000 - 4,500'), reduce gas manifold pressure to 3.0”

W.C. for

natural gas and 9” W.C. for LP gas.

NOTE: Do not attempt to change the size of an orifice by drilling it out. To do so will

void the manufacturer’s warranty

Table 12. High Altitude

FURNACE ORIFICE SIZE AND ALTITUDE - FEET

MODEL OUTPUT CAPACITY SEA LEVEL 2000 3000 4000 5000 6000 7000 8000 9000 10000

ORIFICE SIZE - NAT. GAS 29 293030303031313132

M1M/G 056 ORIFICE SIZE - LP 45 46 47 47 47 48 48 49 49 50

OUTPUT- MBTUH 45.4 41.8 40.1 38.5 37.0 35.5 34.1 32.7 31.4 30.2

ORIFICE SIZE - NAT. GAS 24 252627272828292930

M1M/G 070 ORIFICE SIZE - LP 42 42 43 43 43 44 44 45 46 47

OUTPUT- MBTUH 56.7 52.3 50.2 48.2 46.2 44.4 42.6 40.9 39.3 37.7

ORIFICE SIZE - NAT. GAS 21 232324252627282829

M1M 077 ORIFICE SIZE - LP 40 41 42 42 42 43 43 44 44 45

OUTPUT- MBTUH 61.7 56.9 54.6 52.4 50.3 48.3 46.4 44.5 42.7 41.0

ORIFICE SIZE - NAT. GAS 21 232324252627282829

M1G 077 ORIFICE SIZE - LP 40 41 42 42 42 43 43 44 44 45

OUTPUT- MBTUH 59.9 55.2 53.0 50.9 48.9 46.9 45.0 43.2 41.5 39.8

ORIFICE SIZE - NAT. GAS 17 181919202122232426

M1M 090 ORIFICE SIZE - LP 36 37 38 38 39 40 41 41 42 43

OUTPUT- MBTUH 71.7 66.1 63.5 60.9 58.5 56.1 53.9 51.7 49.7 47.7

ORIFICE SIZE - NAT. GAS 17 181919202122232426

M1G 090 ORIFICE SIZE - LP 36 37 38 38 39 40 41 41 42 43

OUTPUT- MBTUH 69.7 64.2 61.7 59.2 56.8 54.6 52.4 50.3 48.3 46.3

ORIFICE SIZE - NAT. GAS 26 272828282929303030

M1B 066 ORIFICE SIZE - LP 43 44 44 44 45 45 46 47 47 48

OUTPUT- MBTUH 52.6 48.5 46.6 44.7 42.9 41.2 39.6 38.0 36.5 35.0

ORIFICE SIZE - NAT. GAS 18 191920212223242627

M1B 086 ORIFICE SIZE - LP 37 38 39 39 40 41 42 42 43 43

OUTPUT- MBTUH 68.2 62.9 60.3 57.9 55.6 53.4 51.2 49.2 47.2 45.3