Nordyne M1G User manual

M1 Series

Service Manual

M1G and M1M Furnaces

Typical meters used to service M1 furnaces.

A. Differential Pressure Gauge

B. Volt-Ohm Meter

C. Manometer

D. Inclined Manometer

TABLE OF CONTENTS

1. INTRODUCTION

Model Identification Code........................................ 4

Serial Number Identification .................................... 4

Clearances and HUD Requirements ....................... 5

Unit specifications ................................................... 5

2. CIRCULATING AIR SUPPLY

Return air requirements .......................................... 6

Blower performance data ........................................ 6

Supply air systems.................................................. 7

3. VENTING AND COMBUSTION AIR

Roofjack selection ................................................... 7

Roofjacktroubleshooting......................................... 7

Application of high wind and arctic caps.................. 8

4. ELECTRICAL WIRING

Line voltage............................................................. 8

Low voltage............................................................. 9

5. GAS SUPPLY,CONVERSION AND LIGHTING

M1G,M1M MODELS

Gas piping............................................................. 10

Gas conversion nat to LP...................................... 10

Gas safety nat and LP........................................... 11

Derating for high altitude ....................................... 11

Proper pilot lighting M1G only ............................... 12

Leak checking gas line.......................................... 12

6. ACCESSORIES

Relay boxes .......................................................... 13

Cooling blowers..................................................... 13

Furnace accessories for package unit add on ....... 13

Fan timer kit .......................................................... 13

All Weather Cap ................................................... 13

7. SEQUENCE OF OPERATION , COMPONENT PARTS

AND TROUBLESHOOTING, M1G

STANDING PILOT MODEL M1G

Troubleshooting flow chart M1G-056-070 ............. 15

Troubleshooting flow chart M1G-077-090 ............. 16

Sequence of operation heating.............................. 17

TROUBLESHOOTING

Power supply ........................................................ 17

Transformer .......................................................... 17

On-off switch and fan switch ................................. 17

Low voltage wiring................................................. 18

Limit controls......................................................... 18

Combustion air relay, 077 and 90 only .................. 18

Combustion air blower, 077 and 90 only ............... 18

Pressure switch, 077 and 90 only ......................... 18

Burner assembly ................................................... 19

Gas valve .............................................................. 20

Pilot assembly, Thermocouple, and Venturi .......... 20

Fan switch............................................................. 21

Blower assembly................................................... 21

Heat exchanger..................................................... 22

Pilot outage ........................................................... 22

Pilot Outage Chart................................................. 23

WIRING DIAGRAMS

M1G, Natural Draft, AC adaptable........................ 24

M1G, Natural Draft, AC ready .............................. 24

M1G, Forced Draft, AC adaptable ........................ 25

M1G, Forced Draft, AC ready............................... 25

8. HOT SURFACE IGNITION SYSTEM MODEL M1M

Troubleshooting flow chart .................................... 27

Sequence of operation heating.............................. 28

TROUBLESHOOTING

Power supply ........................................................ 28

Transformer .......................................................... 28

Low voltage wiring................................................. 29

Limit controls......................................................... 29

Intergrated control board ....................................... 29

Combustion air blower .......................................... 31

Pressure switch..................................................... 32

Hot surface ignitor ................................................. 33

Burner assembly ................................................... 33

Gas valve .............................................................. 33

Blower assembly................................................... 34

Heat exchanger..................................................... 34

WIRING DIAGRAM

M1M, All ................................................................ 35

Model Identification

Door Color

W = White

G = Gray

Cabinet Size

A = 20" x 24" x 56”

B = w/Coil Cavity, 20” x 24” x 76”

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, HSI, Forced Draft

B = Gas, Gun Burner

S = Oil, Gun Burner

M 1 G H - 056 A - BW

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

INTRODUCTION

Thisservicemanualisdesignedtobeusedinconjunctionwith

the installation manual provided with each furnace.

The downflow sealed combustion furnaces illustrated in this

servicemanualrepresenttheverylatestinhighefficiencygas

furnace technology. Certain controls within the furnace

consist of highly sophisticated electronic components which

are not user serviceable. It is essential that only competent,

qualified, service personnel attempt to install, service, or

maintain this product.

This Service manual was written to assist the professional

HVAC service technician to quickly and accurately diagnose

and repair most malfunctions of this product.

This service manual covers standing pilot and hot surface

ignition gas burner models. The overall operation of both of

these models is essentially the same, with the exception of

certain controls which may be unique to each model.

Thismanualwilldealwithallsubjectsinageneralnature(i.e.

alltextwill pertaintoall models) unlessthatsubject isunique

to a particular model or family, in which case it will be so

indicated.

It will be necessary for you to accurately identify the unit you

are servicing, so you may be certain of approved diagnosis

and repair. (See Unit Identification, Below)

This manual was prepared by the senior Technical Service

Department and the Communications Department.

The information contained in this manual is intended for use

byaqualifiedservicetechnicianwhoisfamiliarwiththesafety

procedures required in installation and repair and who is

equipped with the proper tools and testing instruments.

Installations and repairs made by unqualified persons can

result in hazards subjecting the unqualified person making

suchrepairs to the risk of injury or electrical shockwhich can

be serious or even fatal not only to them, but also to persons

being served by the equipment.

If you install or perform service on equipment, you must

assume responsibility for any bodily injury or property dam-

age which may result to you or others. We will not be

responsible for any injury or property damage arising from

improper installation, service, and/or service procedures.

WARNING:

Serial No. Identification

Model Series

M 1 G 9807 - 05432

Production

Year/Month

Production Code

Table 1. M1 Furnace Specifications

NOTICE TO INSTALLER

Installer is advised to follow carefully all instructions and

warnings in this manual to insure maximum performance,

safety,andoperatingefficiencyoftheseappliances.Improper

installationmaycreatehazardousconditions,andwillvoidthe

appliance warranty.

1. SPECIFICATIONS

GENERAL DESCRIPTION

M1 Series gas and oil furnaces are listed direct vent (sealed

combustion),downflowheating appliancesformanufactured

(mobile)homes,recreationalvehicles,andforuseinresiden-

tial/modular/commercial construction. The furnace must be

located so that venting can be properly achieved.

“A” cabinet models may be installed with Optional Coil Cabi-

net Model #911969 for air conditioning.

“B” cabinet models are factory equipped with a built-in coil cavity.

Multi-speedblowerassemblies(SeeAccessories)havebeen

certified for field installation in M1 Series furnaces. An air

conditioner can be easily field installed with M1GH Series

furnacesifusedinconjunctionwithcertified2-wirerelaybox,

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

INSTALLATION STANDARDS

Installer shall be familiar with and comply with all codes and

regulations applicable to the installation of these heating

appliances and related equipment. In lieu of local codes, the

installationshallbeinaccordancewiththecurrentprovisions

of one or more of the following standards.

Electrical Supply - 120 Volts, 60 Hz, 1 Ph. Thermostat Circuit - 24 Volts, 60Hz, 30 VAC

Fuse or Breaker - 15 Amps. Norm. Anticipator Setting - 0.4

Temperature Rise - 45° to 75°F Manifold Pressure - Natural Gas - 3.5” w.c. LP Gas - 10” w.c.

High Altitude - See Table 7. *Nominal blower capacity only – relay must be field added.

For Canadian High Altitude (2,000'-4,500'),reduce the gas manifold pressure to 3.0" w.c. for natural gas and to 8" w.c. for LP gas.

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

ModelNo MBtu/h MBtu/h Nat. LP InWC Burner Direct Blower Hp Tons

M1GH 056 56 45 29 45 0.2 x 1/8 2*

M1GB 056 56 45 29 45 0.3 x 1/3 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 1/3 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 60 21 40 0.3 x x 1/4 3*

M1GB 077 77 60 21 40 0.3 x x 1/4 3

M1GC 077 77 60 21 40 0.3 x x 1/2 4

M1GD 077 77 60 21 40 0.3 x x 3/4 5

M1GH 090 90 70 17 36 0.3 x x 1/4 3*

M1GB 090 90 70 17 36 0.3 x x 1/4 3

M1GC 090 90 70 17 36 0.3 x x 1/2 4

M1GD 090 90 70 17 36 0.3 x x 3/4 5

M1MA 056 56 46 29 45 0.2 x x 1/8 2

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

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 installations.

c. American National Standard (ANSI-Z223.1/NFPA-54)

and/or CAN/CGA B149 for all gas-fired furnace models.

d. AmericanNationalStandard(ANSI-Z95.1/NFPA-31)and/

or CSA B139 for all oil-fired furnace models.

e. AmericanNationalStandard(ANSI-C1/NFPA-70)and/or

CSA22.1Canadian ElectricCodePart 1 forallelectrical

field wiring.

f. Units have been investigated under standards UL 307A

&B,ANZI21.47a—CAN/2.3a-1995,andCSAB140.10.

2. CIRCULATING AIR SUPPLY

RETURN AIR PROVISIONS

U.S.A. home manufacturers shall comply with all of the

followingconditionstohave acceptablereturnairsystemsfor

closet installed forced air heating appliances:

a. Regardlessofthelocation,thereturnairopeningintothe

closet shall not be less than specified in the appliance’s

listing.

b. Means shall be provided to prevent inadvertent closure

bya flat objectplaced over thereturn air openingwhen it

islocatedinthefloorofthecloset(versustheverticalfront

or side wall).

c. The cross-sectional area of the return duct system lead-

ingintothecloset,whenlocatedinthefloororceilingshall

notbelessthan235squareinches(or390squareinches

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 352 sq. in. At least one register should be located

whereitisnotlikelytobecoveredbycarpeting,boxesand

other objects.

e. Materials located in the return duct system must have a

flamespreadclassificationof200orless.Thisincludesa

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.

Table 2. Blower Performance Data

ESP

(In. W.C.)

Low Med-Lo Med-Hi High Low Med-Lo Med-Hi High

1/8 HP 1 024 0.1 820 730

9 X 7.5 0.2 790 680

0.3 720 610

056 - H, A 0.4 650 550

UNITS 0.5 560 450

0.6 430 330

1/5 HP 1 030 0.1 950 850

9 X 7.5 0.2 910 810

066-A 0.3 850 730

070 - H,A 0.4 780 670

UNITS 0.5 680 580

0.6 570 480

1/4 HP 1 036 0.1 1210 1140

10 x 8 0.2 1190 1110

077 - H, B 0.3 1140 1050

090 - H, B 0.4 1090 990

086-B 0.5 1030 930

UNITS 0.6 970 870

1/3 HP 2 036 0.1 1020 1350 960 1210

10 x 8 0.2 1000 1330 940 1170

056 - B 0.3 970 1260 890 1110

070 - B 0.4 940 1210 850 1050

UNITS 0.5 890 1130 790 980

0.6 840 1060 730 900

1/2 HP 4 047 0.1 890 1070 1270 1480 880 1050 1220 1340

11 X 8 0.2 880 1060 1260 1460 870 1040 1210 1330

0.3 860 1020 1220 1400 850 1000 1160 1270

C UNITS 0.4 840 1000 1180 1350 820 980 1110 1210

0.5 810 960 1120 1280 800 940 1070 1160

0.6 760 920 1080 1220 750 890 1010 1090

3/4 HP 4 054

10 x 8 0.2 900 1110 1450 1850 870 1070 1420 1700

4 POLE 0.3 860 1080 1410 1810 840 1050 1380 1650

0.4 830 1040 1370 1760 820 1030 1350 1630

D UNITS 0.5 790 1020 1340 1730 780 1010 1320 1590

0.6 770 990 1320 1700 760 980 1290 1550

HP, Wheel,

Poles, Units Coil

Size WITHOUT COIL WITH COIL

Speed

g. Wiring materials located in the return duct system shall

conform to Articles 300-22 of the National Electrical

Code (ANSI C1/NFPA-70).

h. Gaspipingisnotruninorthroughthereturnductsystem.

i. Test the negative pressure in the closet with the air-

circulating fan operating at high speed and the closet

closed.Thenegativepressureistobenomorenegative

than minus 0.05 inch water column.

j. Forfloorreturnsystems,themanufacturedhomemanu-

facturer shall affix a prominent marking on or near the

appliance where it can be easily read when the closet

door is open. The marking shall read:

k. Airconditioningsystemsmayrequiremoreduct,register

and open louver area to obtain necessary airflow. Use

NORDYNE’s certiduct program to determine proper

duct size for A/C.

Air Distribution Systems

For proper air distribution, the supply duct system must be

designedsothatthestaticpressuremeasuredexternaltothe

furnace does not exceed the listed static pressure rating

shown on the furnace rating plate.

Before installing an air conditioner system, consult home

manufacturerforductsystemmaximumcapacity. Location,

size,andnumberofregistersshouldbeselectedonthebasis

of best air distribution and floor plan of the home.

Table 3. Roof Jack Assemblies

CAUTION:

HAZARDOFASPHYXIATION:Donotcoveror

restrict return air opening.

3. VENTING AND COMBUSTION AIR

ROOF JACK SELECTION

Note: Install only Roof Jack Assemblies listed in Table 3 on

this heating appliance.

a. Determine depth of ceiling cavity from center of roof

openingtocenterofceilingopening.(SeeDimension“A”

in Figure 1).

b. Determine ceiling height and subtract height of furnace.

(See Dimension “B” in Figure 1).

c. Add dimensions A + B (and X from Table 3 and Figure 2

ifslantdeck flashingisused). The totallengthof (A+B +

X) must be within the minimum and maximum range of

one of the Roof Jacks listed in Table 3.

ROOF JACK TROUBLE SHOOTING

The roof jack assembly is a telescoping type assembly (see

selection)thatismadeupofapipewithinapipeconstruction.

Theinner pipe(5”)is fortheflue gasesto exit thehome. The

outerpipe(8”)isusingthespacein-betweenthe5”and8”pipe

forcombustionair. Ifthefurnaceissmotheringitselfout,after

ashorttime,onnaturaldraftmodels,orpressureswitchdoes

notmakecontactonM1Mmodel,slideupairinletafewinches

and check for debris in pipe. Clean out and check complete

flue assembly for blockage. On new homes make sure no

building materials fell in the top (air inlet or exhaust). Also

removetopandmakesurenoseamshaveopeneduponroof-

jackassembly. OntheM1Gfurnace(naturaldraftmodel)the

airinletlimittrippingiscausedfromaunbalanceddraft,which

means the air inlet becomes a better flue than the flue itself.

Check-out Procedure:

Is furnace filter clean?

Iffurnaceisinstalledincloset,whatisthelouveropenarea?

The installation instructions state the minimum open area

required is 235 sq. in., or 390 sq. in. for 5 ton.

Inspect roof-jack for internal blockage.

Inspect inside of upper combustion air box for debris.

With burner removed, reach inside lower air box into com-

bustion air chute to check for debris (insulation, roofing

material, drywall, etc.) and look in the bottom of the heat

exchanger for debris.

SSAW T27 47 - 2

AW= ALL WEATHER

FLASHING

PITCH/12" RISE

0=FLAT

2=2.5/12

4=4/12

MIN. ADJ.

LENGTH

S= FLAT FLASHING

SLANT FLASHING TYPE:

BLANK=NON-TRANSIT

T= TRANSIT MODE MAX. ADJ.

LENGTH

FLUE STEEL TYPE

A= ALUMINIZED

S=STAINLESS

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"

Is gas orifice the proper size for the gas in use?

Check manifold gas pressure at low fire (14 seconds

nominal) before it steps to normal high fire.

The compression fitting on the pilot tube must be tight.

Isthe burneralignedperpendicular totheburner mounting

plate?

APPLICATION OF ALL WEATHER CAPS

In most cases, when a pilot is blown out during windy condi-

tions, an all weather cap will take care of this problem.

Extension(s)willalsohelp(seePilotOutage).SeeAccessory

Chart for part numbers.

All weather caps are used in areas of extreme cold (10° or

lower) for long periods of time. This causes ice to form and

block combustion air. Replace the standard crown with the

optional all weather cap. Follow instructions with the new all

weather cap. See Accessories section for part number.

a. Iftheroofjackcrowniscoveredorblockedwithsnow,the

furnacewillnotoperateproperly.Ifthehomeislocatedin

regions where snow accumulation exceeds 7” (HUD

snowloadzones) use anexternal roof jackextension p/n

901937.

b. M1 furnaces may be used with roof jacks as tall as 170”

(except M1M 056 models, which are limited to 120”).

Internalroofjackextensions(p/n901935-10”,p/n903107

-18”)canbeusedtoincreaseroofjackheight.Allconnec-

tions inside the home must be made below the ceiling.

ELECTRICAL WIRING

Line Voltage Wiring (See Figure 15)

The line voltage (115 volt) to the furnace must be supplied

from a dedicated circuit containing the correct fuse or circuit

breaker for the furnace. See Table 5. An electrical switch

should be readily accessible from and within sight of the

furnace.Alllinevoltageconnectionsmustbemadewithinthe

junction box located within the furnace.

The furnace cabinet must have an uninterrupted, unbroken

ground to minimize injury should an electrical fault condition

occur.Thecontrolsused in thisfurnacealsorequirean earth

groundtocooperateproperly.Acceptablemethodsforground-

ingareelectricalwireorconduitapprovedforelectricalground

service. Do not use gas piping as an electrical ground.

NOTE:Properlinevoltagepolaritymustbemaintainedin

order for the control system to operate correctly. Verify

that the incoming neutral line is connected to the white

wireandtheincoming"hot"lineisconnectedtotheblack

wire in the furnace junction box. This furnace will not

operate unless polarity and ground are properly con-

nected. (See Figure 16).

Never use gas lines as ground.

To determine polarity, the incoming power supply should be

checked. The "Hot" lead will read 115V to ground. The

"neutral" should read 0V to ground.

Figure 2.

Figure 3.

Figure 1. Roof Jack Assemblies

Roof Jack

Flat Roof

Ceiling Cavity

Ceiling

Flue Pipe

Combustion

Air Pipe

Flashing

This joint

may be

above ceiling

"A"

"B"

56" or 76"

Furnace

5/12 ROOF SLOPE

SLANT DECK

/12

ROOF JACK WITH

FLASHING

/12 SLANT

ROOF JACK

SLANT DECK

FLASHING

PITCHED

ROOF

CEILING

CEILING CAVITY

ROOF OPENING

CEILING OPENING

"X" (SEE TABLE 1)

Supply Voltage

Supply voltage to the furnace should be nominal 115 volts. It

mustbebetween103voltsand127volts.Supplyvoltagetothe

furnaceshouldbecheckedwithfurnaceinoperationandblower

running. Voltage readings outside the specified range can be

expected to cause operating problems. Their cause MUST be

investigated and corrected.

CONNECT THERMOSTAT WIRES

a. Insert 24 volt wires through the plastic grommet just

above the control panel.

b. Connect the thermostat wires to the furnace low voltage

pigtails (see Figure 5).

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

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

sourcesofheatorcolddrafts. Thenominalanticipatorsetting

is 0.4. (Refer to the thermostat literature for additional infor-

mation.)

Five-conductor thermostat wire is recommended for 24 volt

low-voltagecircuit (2-wireis required forfurnace only;5-wire

for heating and optional cooling systems).

Oncethefurnaceisinstalledcheckthethermostatanticipator

against the nominal setting of 0.4:

1. Connectthemilliamp meter inseries withthe “W” circuit.

2. Energize a call for heat.

3. Read the value of the milliamps.

4. Adjust the heat anticipator of the thermostat to the value

read on the milliamp meter.

Ifthe heatanticipatoris settoo highthefurnace maydelay in

coming on.

If the heat anticipator is set too low the furnace may cycle

frequently and not provide the desired comfort level.

Figure 6. Line Voltage Field Wiring

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

(

Unit to T’STAT

)

Table 4. Thermostat Wire Gauge

Figure 5. 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

Figure 4. Thermostat Wiring A/C Ready Models

Red

White

Green

Yellow

Red

White

Green

Grey

To Cooling Unit

Thermostat M1G A/C

Ready Furnace

Field Supplied

Disconnect Within

Sight of Furnace

Field Supplied

Panel Connector

Field Supplied

Fused Service

Panel

Black (Hot)

White (Neutral)

Green or Bare (Ground)

Black

White

Black

White

Black

White

Field Line Voltage

Wiring

Factory Line

Voltage Wiring

Ground Ground Ground

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

g. For Honeywell gas valves with the regulator converter

(Figure8),checkforthelettersNATorLPonthepressure

regulator cap. Unscrew the cap, invert it, replace, and

tighten until snug.

h. For the Robertshaw gas valve with the regulator con-

verter (Figure 9), 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

bottomandthe“LP”stampingontheconverterwillappear

right side up.) Then screw converter back into the regu-

lator,handtightplus1/8turn,andreplacetheblackcover

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. Openthemanualshut-offvalveandfollowtheFURNACE

START-UPprocedureasoutlinedpreviouslyinthismanual

to put the furnace into operation.

NOTE:Thepilotflameisadjustablebyturningtheadjustment

screwlocatedonthegasvalvewithasmallscrewdriver.(See

Figure 10)

5. GAS SUPPLY, CONVERSION, AND

LIGHTING – M1G AND M1M MODELS

GAS PIPING

Sizingandinstallationoffuellinesmustbeinaccordancewith

federal, state and local regulations. All piping shall be black

ironpipe, orequivalently sizedsteel tubing. Internallytinned

copper tubing may be used for gas supply systems.

Fuellineinstallationsotherthantypicalinstallationsshownin

Figure7mustcomplywiththefuelpipingprovisionsstatedin

theFederalManufacturedHomeStandard(H.U.D.TITLE24,

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 (LP gas).

The gas supply to your home will either be Natural Gas or LP

(bottle gas). Your furnace is factory equipped to operate on

Natural Gas. If your gas supply is LP, you must convert the

furnace. Thenecessaryinstructionsforthegasconversionare

foundonthelightinginstructionlabelattachedtothefurnacein

Section 16, Service Guide.

Fornaturalgasoperation,thefurnaceisdesignedfor7"W.C.

inlet pressure. Pressure is reduced to 3-1/2" W.C. by the

pressure regulator 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.

GAS CONVERSION

Thisgasfiredheatingappliancewasshippedfromthefactory

for use with natural gas. However, 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. Followtheinstructionsto“TurnOffGastotheAppliance.”

b. Disconnect the gas pipe union and the electrical wires

connected to the gas valve.

c. Remove the pilot tube and thermocouple from the gas

valve (M1G* only).

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*).

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

in the envelope located by the gas valve. Check to insure

theorificesizematchesthenameplate.NOTE:Foreleva-

tionsover2,000feet,useTable7todetermineorificesize.

To Gas

Supply

Floor

Control

Panel

On-Off-Fan

Switch

,,,

Alt. Fuel

Line Entry

Floor Cavity

Figure 7. Typical Gas Piping

CAUTION:

The furnace must be converted by a qualified

technician. Improper conversion can cause

unsafe operation, explosion, fire and/or

asphyxiation.

This manual suits for next models

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