NORDYNE Furnace/Heater, Gas Manual L0523341

M3RL Series L0523341

User Manual: NORDYNE NORDYNE Furnace/Heater, Gas Manual NORDYNE Furnace/Heater, Gas Owner's Manual, NORDYNE Furnace/Heater, Gas installation guides

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Direct Vent (SeaHed Combustion)

M3RL Series 90+ Downfiow
For installation in:
I. Manufactured

Forced

Air Gas Furnaces

Condensing

Furnace

Homes

2. Park Models and Manufactured
3. Modular Homes/Buildings

Buildings

WARNING:
FiRE OR EXPLOSION

HAZARD

Failure to fol!ow safety warnings e×actly could
result in serious injury, death or property
damage.
- Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.

-WHAT

TO DO mFYOU SMELL

GAS

o Do not try to light any appliance.
o Do not touch any electrical switch; do not use any
phone in your building.
, Leave the building immediately.
o 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
department.
-installation
and service must be performed by a
qualified installer, service agency, or the gas supplier.

BW Models

BWT Models

RISQUE

D'INCENDmE OU D'EXPLOSmON

Le non-respect des avertissements
de s_curit_
pourrait entra_ner des blessutes
graves, la
mort ou des dommages mat_rieJs.
- Ne pas entreposer ni utiliser de I'essence ni
d'autres vapeurs ou liquides inflammables dans Ic
voisinage de cet appareil, ni de tout autre apparei
-QUE
FAmRE S'IL YA UNE ODEUR DE GAZ
o Ne pas tenter d'allumer aucun appareil.
,Ne toucher a aucun interrupteur
61ectdque;
n'utiliser aucun t616phone dans le b_timent.
o E_vacuer I'immeuble immCdiatement.
, Appeler immCdiatement le foumisseur de gaz en
employant le t616phone d'un voisin. Respecter
la lettre les instructions du foumisseur de gaz.
o Si personne ne repond, appeler le service des
incendies.
- Uinstallation et I'entretien doivent Ctre effectues
par un installateur qualifie, un organisme de
service ou le fournisseur de gaz.

WARNING:
Shoumd overheating
occur, or the
gas suppty fail to shut off, shut
off the manual gas valve to the
appliance before shutting off the
electrical

supply.

Improper
installation,
adjustment,
amteration,
service
or
maintenance
or property
this manual.
additional
a qualified
agency

can cause

injury

damage.
Refer
For assistance
information

consult

installer,

service

or the gas supplier.

LEAVE THESE mNSTRUCTmONS WroTHTHE HOMEOWNER.

to
or

TABLE
Generam ......................................................
Unit Dimensions ..................................
Shipping Weights ................................
Furnace Specification ........................
Air Flow Data .....................................
Owner's

hformation

................................

OF CONTENTS
4
4
4
4
4
5

Installation
Requirements
......................
Location ..............................................
Clearance ...........................................

6
7
7

Circumating

............................

..............................

Return
Air

Air Supply

Air Provisions

Distribution

Duct

Connector

Duct

Installation

Systems

........................

....................

Selection

Conversion

..............................................

Lighting and Adjustment
of the Appliance ..............................

ElectdcaIWiring
......................................
Line Voltage Wiring ...........................
Low Voltage Wiring ...........................

24
24
26

Ventilation

................................................

Start-up and Adjustment
........................
Start-Up Procedure ...........................
Shut Down Procedure .......................

26
26
27

Verifying and Adjusting Firing Rate ... 27
Temperature Rise ............................. 27
Verifying and Adjusting
Verifying Burner Operation .............. 28
Verifying Operation of the
Supply Air Limit Switch ................. 28

....................................

and Combustion
Requirements
...........................

Description

Venting
Requirements
..........................
Vent Table ........................................
Vent Pipe Material ............................
Vent Pipe Length and Diameter .......
Vent Pipe installation ........................
Pipe Routing & Support ....................
Location of Outdoor Termination .....
Horizontal Venting ............................
Vertical Venting ................................
Vent Freezing Protection .................
Concentric Vent Termination ...........

14
15
16
16
16
16
16
18
18
19
19

Furnace

Drainage of Condensate
From Furnace ................................

Gas Supply and Piping .........................
Leak Check .......................................

20
21

Wiring

Diagram .......................................

High Altitude Derate .........................
Pressure Switch ..............................

21
21

instaliationlPerformance
CheckJist .........................................

Venting
Air

Maintenance

Application

...........................................

Furnace

Series

Comfort

Mode!

RL - Condensing

29
29

Condensate Drain Assembly ........... 30
Blower Compartment ....................... 30
Heat Exchanger and Burner
Maintenance ..................................
30
System Operation
Information ............. 30
Sequence of Operation .................... 30
Furnace Fails to Operate ................. 31
of Major

Components

.......... 32

060 A - A W

c°°,,°°,°t,°°

M-Manufactured

................ 29

.............................

Combustion Air and Vent System .... 29
Air Filter(s) .......................................
29
Lubrication ........................................
30

Location

M3RL-

of Components

Accessories

Home

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"

m
Downflow

Heating Capacity
input, BTUH (000')
Tabte 1. Model

Electricam Code
A - IPH, 60 Hz, 120 VAC

identification
3

I£_7/8

%1#2

-317132
COMBUSTION

24_5/8 -AiR INTAKE

1-1/118
EXHAUST
VENT

18 1#2

KNOCKOUTS

•I--

I_r2

56!/16

(W/C_EBOX}
7_!_
(W/O CoilBo_)
/32

2"37116

917132

,
1 19F32
21 157/6 --

Cooling
Coil
Box

1_3/!6

_--

Figure

Furnace

24_t4

Dimensions

Top Return Knockouts
_12.000_

_J
1000

Shipping
Weight

21000

O
©

Furnace Model
M3RL 060A AW

(Ibs)
15O

M3RL 060A BW*

170

M3RL 080A AW

155

M3RL 080A BW*

175

* May include

Top

Top View
(AW and BW Models)

Furnace
Furnace
Model No.

M3 RL-060

M3 RL-080
Note:

Specifications
Furnace

Furnace

Input
Btuh

Output
Btuh

60,000

80,000

54,000

72,000

Returr_ Opening
(BWT Models)

/ Airflow

35-

I/2

35 - 65

I/2

Weight

External
0.1

Static Pressure ( Inches Water
0.2
0.3
0.4

Speed
High*

CFM
1660

CFM
I599

CFM
I544

CFM
1474

CFM
I410

Ton
4

Med-High
Med-Low

1512
1340

I467
I304

I416
I261

1363
1217

I304
II58

3
2.-I/2

Low**

1176

II42

I108

1025

966

High*

1660

I599

I544

1474

I410

Med-High
Med-Low**

1512
1340

I467
I304

I416
I261

1363
1217

I304
II58

Low

1176

II42

I108

1025

966

Factory Wired Heating Tap
Table

Shipping

Motor

Data is for Operation with Filter,
* Factory Wired Cooling Tap
**

Data

Temp.
Rise @ Motor
.3"WC °F HP

Table

suffix - T

Furnace

SpecificationslAirflow

Data

Column)
0.5

Recommended
A/C

3
2.-I/2
2

Never test for gas leaks with an open
flame. Use a commercially available soap
solution made specifically for the detection
of leak to check all connections.

Always install furnace to operate within the
furnace's intended temperature rise range
with a duct system that has an external
static pressure within the allowable range,
as specified in page 4 of these instructions. See furnace rating plate.
When a furnace is installed so that supply
ducts carry air circulated by the furnace to
areas outside the space containing the
furnace, the return air shall also be handled
by duct(s) sealed to the furnace casing
and terminating outside the space containing the furnace. Note: This section only
applies to furnaces installed with side or
top return air.
A gas-fired furnace for installation in a
residential garage must be installed as
specified in page 7 of these instructions.
The furnace is not to be used for temporary heat of buildings or structures under
construction.

WARNmNG:
Do not

use this

appmiance

has been submerged
mediatemy
nician

camsa quamified

to inspect

if any

underwater.
service

the appmiance

part
Imtech-

and to

repmace any part of the controm system
and

any

submerged

gas

controm

that

has

been

underwater.

NOTICE TO iNSTALLER
Installer is advised to follow carefully all instructions and warnings in this manual to insure
maximum performance, safety, and operating
efficiency of these appliances. Improper installation may create hazardous conditions, and will
void the appliance warranty.

GENERAL
General Description
The M3 series gas furnaces are listed direct
vent (sealed combustion) forced air furnaces
for use with both natural and propane gases.
The M3 series is a Category IV and type FSP
furnace. The M3 furnace series has been
certified to the ANSi Z21.47/CSA2.%2001
for
use in the United States and Canada and to the
UL307B --1995 for use in the United States.

These furnaces may be installed in:
I. Manufactured Homes.

OWNER

2. Park Models and Manufactured
3. Modular Homes/Buildings

buildings

The following are safety guidelines with references to their specific sections or pages in the
manual.
I.
2.

Use only type of gas approved for this
furnace. Refer to the furnace rating plate.
Install this furnace only in location and
position as specified in pages 7 - 13 of
these instructions.
Provide adequate combustion and ventilation air to the furnace space as specified in
pages 13 - 20 of these instructions.
Combustion products must be discharged
outdoors, connect this furnace to an approved vent system only, as specified in
pages 14-19 of these instructions.

M3 series furnaces are air conditioning ready
as shipped. The furnace cooling capacities of
the blower motor speed taps are shown in
Table 3. Table 2 lists the shipping weights for
the M3 series furnaces.

NFORMATION

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 combustion system from the living area of the
home, now a standard for the manufactured
home industry.
NORDYNE engineers developed the first central heating system and the first central air
conditioner for manufactured homes.
NORDYNE is dedicated to bringing to its customers the finest heating and cooling comfort
possible. NORDYNE constantly seeks to further refine its products to continuously provide
exceptional comfort.

Followthe instructionsin this bookletcarefully
andthis appliancewill providemanyyearsof
superiorperformance.

6. Providinginstructionaltrainingon how to
lightandoperatethefurnace.
7. Furnaceproblemscausedbyinstallationof
an air conditioner,heatpumpor otherair
comfortdevices.
if you wish to cool your homeautomatically
witha centralair conditioningsysteminvesti- 8. Revisinginstallationof the furnaceflue
gatetheexcellentNORDYNEcoolingsystems
assembly.
availablefromyour heatingand coolingcon- 9. Adjustingor calibratingof thermostat.
tractor.Thesesystemsare designedto work 10.Any constructiondebris which falls into
best with your NORDYNEfurnaceand have
theflue system.
beencarefullyengineeredto deliveroptimum
performancewhen mated with NORDYNE Carefullyreviewtheseresponsibilities
withyour
manufacturedhomefurnaces.
manufactured
housingdealer,servicecompany
or gas supplierso therewill be no misunderNORDYNE
alsoofferswaterheaters,fireplaces standingat a latertime.
and ventilatingsystemsspecificallydesigned
for manufactured
housingapplications.Check
CAUTmON'.
with your manufacturedhomeretailer,your
heating and cooling contractor or your
Never attempt
to alter or modify this
distributorfor information.
Writedirectlyto the
furnace
or any of its components.
factory(POBox8809,O'Fallon,MO63366)if
Never attempt
to repair damaged
or
youarenotabletolocatea sourceforNORDYNE
inoperable
components.
Such action
manufactured
housingproductsin yourarea.
could

MANUFACTURER
WARRANTY,OWNER'S
RESPONSIBILITIES
it isthesoleresponsibility
ofthehomeowner
to
makecertainthegasfurnacehasbeencorrectly
setupandconvertedtotheproperfuel(UP.gas
or Naturalgas)andadjustedto operateproperly. All gas furnacesare manufacturedfor
Naturalgasandmustbefieldconvertedwhen
usingUP.gas.
Awarrantycertificate
withfulldetailsisincluded
with theseinstructions.However,NORDYNE
willnotberesponsible
foranycostsfoundnecessaryto correctproblemsdue to improper
setup,improper
installation,
furnaceadjustments,
improperoperatingprocedureonthepartofthe
user, etc.
Somespecificexamplesof servicecallswhich
cannotbe includedinwarrantypaymentsare:
I. Converting
thefurnacetouseanothertype
ofgas.
2. Repairing
ductworkinthehomefoundtobe
faulty.
3. Correctingwiringproblemsin theelectrical
circuitsupplyingthefurnace.
4. Resettingcircuitbreakers,blownfusesor
otherswitches.
5. Correctingproblemsdueto impropergas
supplypressuretothefurnace.

cause

plosion,

unsafe

fire and/or

• If a malfunction
you
ating

operation,

has

occurred,

feel that the furnace
as it should,

service
agency
sistance.

iNSTALLATiON

ex-

asphyxiation.

contact
or gas

or if

is not opera qualified

utility

for as-

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 installation
shall be in accordance with the current provisions of one or more of the following standards.
a. Federal Manufactured Home Constructions
& Safety Standard (H.U.D. Title 24, Part
3280.707[a][2])
b. The Standard for Manufactured Home Installations (Manufactured Home Sites, Communities, and Set-Ups) ANSI A225.1 and/or
CAN/CSA-2240
MH Series).
c. American National Standard (ANS1-119.2/
NFPA-501C) for all recreational vehicle installations.
d. American National Standard (ANSI-Z223.1/
NFPA-54) and/or CAN/CGA B149 for all gasfired furnace models.
e. American National Standard (ANSI-C1iNFPA70) and/or CSA 22. I Canadian Electric Code
Part I for all electrical field wiring.

CE gen6rateurd'air chauddoit 6tre installe
conformement
aux instructionsdu fabricantet
auxcodesIocaux.EnI'absencede codelocal,
respecterla normeANSIZ223.,I,instituleNationalFuelGasCodeoulescodesd'installation
CAN/GCA-B149.
The NationalFuelGas Codeis availableby
writing:
AmericanNationalStandardsinstitute,inc.
1430 Broadway
NewYork,NY 10018
NFPApublicationsare availableby writing:
NationalFireProtectionAssociation
Batterymarch
Park
Quincy,ME02269

bustible material other than wood flooring. The
furnace may be installed on combustible flooring when installed on a Nordyne duct connector (see Table 5).
The ductwork within 3 feet of the furnaces
without the A/C coil box must be installed such
that surfaces are at least I/4" from combustible
materials.
When installed in a residential garage, the furnace 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.

CiRCULATiNG

LOCATION

WARNmNG:

The furnace must be installed on a level suF
face, and as close to the center of the air
distribution system as possible. See Figure I
for overall dimensions to determine the required clearances
in hallways,
doorways,
stairs, etc. to allow the furnace to be moved to
the installation point. The furnace must be installed so that all electrical components are
protected from water.
Minimum clearances

to combustible

materials

are listed in Table 4. Access for positioning and
servicing must be considered when locating
the unit.
This furnace

is certified

for use on wood

flooring. The furnace must be installed on a
solid surface and must be level front4o-back
and side-to-side.
This furnace must not be
installed directly on carpeting, tile, or any comALL MODELS
Front
Back
Sides
Vent
Top
Duct (Plenum)
w/Coil Box
w/o Coil Box
(within 3 feet)

CLOSET ALCOVE
Inches
Inches
1"

0
0
0
6

0
1/4

*Note: For 1"clearance, use a fullylouvered door with at
least 400 square inches of free airflow area.

Table 4. Minimum

Clearances

AiR SUPPLY

Products

of combustion

allowed
of

to enter

the

must

the return

furnace

the

not be

air openings
circulating

air

supply.

Failure to prevent products
of
combustion
from being circulated
into
the living
hazardous

space can
conditions

poisoning

monoxide
personal
The

iniury

floor

furnace
physical
gaps,
furnace

create potentially
including
carbon

that could
or death.

platform

result

which

the

is mounted
must provide sound
support
of the furnace
with no
cracks,

or sagging

and the floor

The circulating
be connected

between

the

or platform.

air ductwork
must not
to any
other
heat

producing
device
insert, stove, etc.

such

as a fireplace

GENERAL
Plenums and air ducts must be installed in
accordance with the Standard for the Installation of Air Conditioning and Ventilating Systems
(NFPA No. 90A) or the Standard for the Installation of Warm Air Heating and Air Conditioning
Systems (NFPA No. 90B).

RETURN AiR PROViSiONS
U.S.A. home manufacturers shall comply with
aft of the following conditions to have accept=
able return air systems for closet installed
forced air heating appliances:
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 inadverb
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. Closet installations
must use a Iouvered
door having a minimum free area of 235 sq.
in. when located 6" from furnace. For clear=
ance between I" and 6" from furnace, requirements are a Iouvered door with minimum of 235 sq. in. free area, with the open=
ings in closet door directly inJine with the
Iouvered openings in the furnace door. For
I" clearance from furnace, use a fully Iouvered door with at least 400 sq. in. of free
airflow area.
d. The cross-sectional area of the return duct

in the floor or ceiling shall not be less than 235
square inches.
e. The total free area of openings in the floor or
ceifing registers serving the return air duct
system must be at least 352 sq. in. At least
one register should be located where it is not
likely to be covered by carpeting, boxes and
other objects.
f. 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.
g. Noncombustible
pans having I" upturned
flanges are located beneath openings in a
floor duct system.
h. Wiring materials located in the return duct
system shall conform to Articles 300=22 of
the National Electrical Code (ANSI CI/
NFPA=70).

19"_

Top View

system leading into the closet, when located
I_13
A Single

trunk

10 1/4"
1/4'_

duct

Figure

If "X" (Floor

Transition duct
C pw/branches

Figure 2. Non=Platinum
Supply Duct System

English

Cavity)
Metric

7/8"
2"
4 1/4"
6 1/4"
8 1/4"
10 1/4"
12 1/4"

is:

Part
Tab

Number:
Screw

901987
901988
901989
901990
901991
901992
901993

Table 5. Duct Connectors

(depth equal to "X" in Figure 5 and Table 5)

i, "1

I:/

Connector

Model

22
51
108
150
210
260
311

/
X

(mm I Finger

FLOOR CAVITY
Z

of Duct

Use Duct Connector

I
/ Dual trunk duct
B w/crossover connector

SUPPLY AIR DUCT

Figure

/
(

Down

904008
904009
904010
904011
904012
904013
904014

( )OPENING

DUCT

(1) WITH PLATE
(C) REMOVED
OPENING
BECOMES
13-1/4" x 13-1/4"
(2) WITH PLATE
(C) REMOVED
OPENING
BECOMES
13"X 13" WITH REDUCER
ITIS
13"X
10-1/8"

SPACERS

(1) FINGER
(2) SCREW

•

TAB DUCT CONNECTOR
DOWN
DUCT
CONNECTOR

A
X
y

•-

SEE
TABLE

ONLY
ONLY

Figure

ALTFUEL

FUEL
HOLE

Figure

6. Closet

i. Gas piping is not run in or through the return
duct system.
j. 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.
k. For floor return systems, the manufactured
home manufacturer 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:

HAZARD
cover

OF ASPHY×IATmON:

or restrict

return

Do not

air opening.

I. Air conditioning systems may require more
duct register and open louver area to ob-

or Alcove
tain necessary airflow. Use NORDYNE's
certiduct program to determine proper duct
size for AiC.

DUCTED

RETURN

AIR

M3 furnaces with model numbers ending in AW
or BW are factory configured for the return air
to flow through the front Iouvered door. The
return air may also be attached to either side or
the top of the furnace cabinet using a field
installed kit. Refer toTable 12 for the NORDYNE
ducted return kit PiN number. The location and
size of the side and top return air connections
are shown in Figure I. The filter size for the side
return air is 20" x 20" x I". For top return the
filter size is 24" x 16" x I".
M3 furnaces with model numbers ending in
BWT are factory configured for the return air to
enter the top of the furnace.

I
I

2-1/4

FLOOR CUT-OUT
FOR DUCT CONNECTIONS
17-29/32
14-1/2

21-3/4

21-7/16

8-19/32
1-3/4
f

3-I14

VENT

COMBUSTION

AiR INTAKE

FUEL LINE ENTRY

I
1-1/4
ALT FUEL LINE

1-3/4

12-7/8

ENTRY

OUTER

DOOR

15-1/2
FLOOR CUT-OUT
FOR OPTIONAL
COOLING COIL
FOR NON-PLATINUM
SERIES

Figure

NR DiSTRiBUTiON

7. Cut-Out

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.
Three typical distribution systems are illustrated in Figure 2. Location, size, and number
of registers should be selected on the basis of
best air distribution and floor plan of the home.

UNITS

Locations

cavity. To maximize air delivery, remove reducer "C" (see Figure 5) to
obtain the largest open area that will fit
the duct/floor construction.

DUCT iNSTALLATiON
Required floor, ceiling, and roof cut-out openings must be carefully located to avoid misalignment of the furnace (see Figures 6 & 7).
installation procedures are suggested for typical furnace installations and need not be followed in the exact listed sequence.

DUCT CONNECTOR
PLATINUM

SELECTION

SERES

a. For Platinum ready construction use
the 14" round plenum, pin: 903896.
NON-PLATINUM

SERIES

a. Determine depth of floor cavity from
surface of floor to top of supply air duct
(See Figure 3).
b. Select appropriate model from Table 5
which matches X-dimension of the floor
I0

CUT OUT FLOOR OPENING
HOLE

& FUEL LINE

a. Determine center of closet or alcove (Figures 7 & 8).
b. Locate center of the floor opening, measured 10" from the rear wall, and mark cutout measuring approximately 14-I/2" by 14I/2" (+ I") for model duct connector used
(refer to Figures 4 & 5).
c. Locate center of gas line hole, measured 23I/4" from the rear wall and 6-5/8" to the left of
center of the floor cut-out (See Figure 6) or

5-I/4"totheleftofcenterofthefloorcut-out,
or for entry throughright-sideof furnace
measured9"totherightofcenterofthefloor
cut-out.
d. Cutoutflooropeningandonegaslinehole.

INSTALLING PLATINUM SERIES 14"
ROUNDDUCT CONNECTOR
a. Placeductconnectorthroughtheflooropening.(SeeFigure9).
b. Secureductconnectorto floor.

CUT DUCTOPENING(FINGERTABBED
ONLY)
a. Placeductconnectorthroughtheflooropening with bottomtabs restingon top of the
supplyair duct.
b. Centerductconnector
andpushbackagainst
rearedgeofflooropening.
c. Markcut-outlocation(tabarea)andremove
duct connector.
d. Cutout ductopening1/16"largerthanarea
marked.

INSTALLINGSCREWDOWNDUCTCONNECTOR
a.Applya beadof caulking,mastic,or other
approvedsealantaroundbottomsideof I/2"
flangeandrestrictorplate,whenapplicable.
b. Locatethe duct connectorover duct and
carefullylowerscrewdownduct connector
intoplace.
c. Once duct connectoris locatedon duct,
temporarily
holdinplacewhilefasteningduct
connectorto thefloorusingflatheadscrews
or nails.Be sureflangesof ductconnector
stayin contactwith the duct.
d. Screwplenumto ductmakingsurea sealis
madebetweenthe duct andthe duct con-

INSTALLFURNACEMOUNTINGPLATE
a. Placemountingplate(suppliedwithinduct
connector)at rearof theflooropening(See
Figure9).
MOUNTING

REARWALL

FUEL
LINE
HOLES

Figure 8. Mounting Plate

SCREWS
BEND
UNDER

CONNEC
DUCT

_OR

MOUNTING

TABS

OPENING

CONNECTION

Finger Tabbed
Duct Connectors

Screw

Duct

Figure

Down

Connectors

Platinum

Series

9. Duct Connector
11

nector.Additionalscrewsmay be addedif
required.
e. Cutawayalongedgeof flangeallowingthe
centertodropintotheduct.Removesection
ofductwithcaution,asedgeswill besharp.
INSTALLINGFINGERTABBEDDUCTCONNECTORS
a. Placeductconnectorthroughtheflooropeningwith bottomtabsextendingthroughthe
ductopening.(SeeFigure9)
b. Secureduct connectorto floor.
c. Bendbottomtabsunderanduptightlyagainst
the supplyair duct (SeeFigure10).

attachedtothesidesoftheductbyusingsheet
metalscrewsor othersuitablefasteners.(See
Figure11).
if sealant,mastic,or tapeis usedto providea
betterseal,itshouldbeapprovedbyapplicable
nationalor localcodes.
ALTERNATEATTACHMENTMETHODS

This proceduremay alsobe usedto installa
furnace duct connector to narrow metal
ductworkwhereinsufficientclearanceprevents
bendingof the duct connectortabs at the
side(s)of the duct.(SeeFigure12).
NOTE:Theductconnectorisdesignedforuse I. Scoreandcutthe top of the metalduct as
onducts12"inwidth.Whenusingtheconnec=
indicatedin StepI or Step2. WithStep I
toron 12"wideducts,theremaybeinsufficient
choice,alsocutoutthemetalfromtheshaded
clearanceto bendthe tabsontwosidesof the
area"A'.
ductconnector,insuchcasesthetabsmaybe 2. Foldthe ductflap "B"up,(SeeStep3).

TABS

DUCT

1. INSERT DUCTPLBNUM CONNECTOR
INTO DUCT CUT-OUT.

Figure

2. BEND BOTTOM TABS OVER
AND ONTO THE UNDERNEATH
DUCTBERVtCE.

10. Installation

of Duct Connector

Duct Connector

Figure

Duct

11. Narrow

Duct

Narrow

Duct

Installation
STEP 2.

STEP 1.
Fold Back Flap "B"

Fold Back Flap"B"
Cut

Cut- Out

Cut- Out
Area"A"

Top of Duct
--

Fold Back Flap "B"

Staple Folded Duct
Flap (typ) to side of Duct
Connector

Bend Duct Connector Tabs Up
and Over- (along length of duct)

"_k_

!LtC

_L_
STEP 4.

Figure

Fold Back Flap"B"

12. Alternate

Installation

Duct

_--'_

NOTE:Additionalfastenersmay be usedat
rear,sidesor throughdoorframe,as desired,
to securefurnaceto closetor alcoveframing.
VENTING

AND COMBUSTION

AiR

CAUTmON'.
Snow
block

Figure 13. "A', "g', & Platinum
Cabinet Furnaces

must not be allowed
to restrict
or
the combustion
air intake or vent

pipes.
General

SLIDE
ALL

THE

ONTO

SECURE
FURNACE
WFH
2 FASTENERS

• [, '
,',

FRONT

CORNER

q,
'

WAY
MTG

BACK
PLATE

HOLES

FURNACE

,
'

HOLES

Figure 14. "A" Cabinet Furnace
on 911969
Coil Cabinet (NonoPmatinum Series)

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 plenum is securely attached.
6. Tape the duct flap edges with an approved
tape for a leak-free joint.
_NSTALL FURNACE
a. Remove furnace outer door(s) and bottom
fuel line knockout.
b. Place furnace onto duct connector and center 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 13 or 14).

NORDYNE
condensing
furnaces
must be
installed with outdoor combustion air piped
directly to the furnace.
Codes refer to this
type of installation as direct vent, or two pipe
installation.
Provisions must be made for adequate supply
of air for combustion and ventilation.
For
United States installations, the adequacy of
air provisions can be determined by consulting
the current version of the National Fuel Gas
Code (ANSI Z223.1iNPFA-54).
For Canadian
installations, requirements are specified in the
National Standard
of Canada (CAN/CGA
B149.1 & .2). Consult local codes for special
requirements.
NOTE: If the furnace is operated without
adequate air for combustion and ventilation, it
may
not
perform
properly.
Furnace
components
may be strained
by high
temperature and could fail prematurely.

G:
The combustion
blocked

air piping

or restricted

must

not be

in any manner.

WARNmNG:
Furnace
installation
other
than
those

using
described

methods
in the

following
National

sections
Fuel

must complywith
Gas
Code
and

the
all

applicable
sufficient

local
codes
to provide
combustion
air for the furnace.

that

there

is no

blockage

striction,
leakage,
other
deficiencies
Do not allow
nace.
tion

debris

This could
and voids

to fail into the fur-

cause

unsafe

the furnace

opera-

cause
3.

So
all

VENTING

building

warranty.

practical,

FURNACE
VENTED

MUST
WiTH

NOT

OTHER

the

APPLIANCES.
5.

Genera_

Turn

are located
instructions.

appliance
in

thermostat
operate

and

space

of the building.

lighting

inspected

all

connected

system

spaces

the

Place

COMMON

the

the appliance(s)

and other

WARNmNG:

and windows

between

to the venting
4.

and
could

condition.

doors

which

REQUIREMENTS

corrosion
which

an unsafe

far

or re-

being

operation.

Adjust

appliance

shall

continuously.
on clothes

dryers

and

any

This section specifies installation requirements
for 2-pipe combustion air piping. The capacity
table provided in this section applies to the
maximum
equivalent
lengths of vent and
combustion air intake pipe.

other appliance
not connected
to
the venting
system.
Turn on any

These condensing furnaces are classified as
"Category
IV" appliances,
which require
special venting materials
and installation
procedures. Category tV appliances operate
with positive vent pressure and therefore
require vent systems which are thoroughly
sealed.
They also produce
combustion
condensate, which is slightly acidic and can
cause severe corrosion of ordinary venting
materials. Furnace operation can be adversely
affected by restrictive vent and combustion
air piping. Therefore, vent and combustion air
piping lengths must conform completely to the
requirements of Table 6.

Do not operate
fan.

exhaust

exhausts,

shall

operate

at maximum

Test

for spillage

hood

opening

if improper

Seal any

venting
inspect

unused

system
the venting

proper
size
as required

system

and horizontal
in the National

in the
for
pitch,
Fuel

Gas Code,
ANSI Z223.1
or the
CAN/OGA Bt49 mnstallation
Codes
and these instructions.
Determine

draft

after 5 minutes

venting

is observed

Fuel Gas Code, ANSt Z223.1/NFPA
54 a n d/or CSA B I49.1,

Natural

Gas

and Propane
Installation
Codes.
After it has been determined
that

return
openings

hood

during
any of the above tests, the
venting
system
must be corrected
in accordance
with the National

when

HAZARD

draft
at the

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

POiSONmNG

from

appliance

venting
MONOXmDE

speed.
exhaust

dampers.

equipped
relief

hoods
so they

a summer

fireplace

each
CARBON

as range

bathroom

The furnace must be vented to the outdoors.

WARNmNG:

fans, such

and

fans,
other
their

connected

system
tested
doors,
gas

properly

fireplace

outlined

windows,
dampers

burning

to the
vents
above,
exhaust
and

any

appliance

conditions

of use.

It must not be vented in common with any
other appliance, even if that appliance is of the
condensing type. Common venting can result
in severe corrosion of other appliances or their
venting and can allow combustion gases to

*NOTES
1.
Subtract 3.5 ft. for each additional 3" 90 degree elbow.
2.
Two45degree elbowsare equivalent toone 90degree elbow
3
One short radius elbow is equivalent to two long radiu,_
elbows.
4.
Do not include terrnination elbows incalculation of vent length
5
This table is applicable for elevations from sea levelto 400(
ft. Forhigher elevations, decreasevent pipe lengthsby 8% pe
1000 ft. of altitude
6
Only the above pipe materialsare approved for usewith thes(
condensing furnaces.

MAXIMUM
DIRECT VENT, DUAL

APPLICATION

PIPE LENGTH
PVC,CPVC

(ft.)*

Inlet/Outlet

or ABS

SCH. 40 Pipe Size
Model M3RL 060

Model M3RL 080

Tabie 6. Vent Tabie

/
/

VENT

/
/

TERMINAL

AiR

SUPPLY

INLET

[]

Canadian Installations

AREA

WHERE

TERMINAL

iS NOT

PERMITTED

US Installations 2

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

12 inches (30 cm)

B = Clearance to window or door that may be
opened

6 inches (15 cm)for appliances -< 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kW) and -<
100,00 Btuh (30 kW), 36 inches (91 cm) for
appliances >100,00 Btuh (30 kW)

6 inches (15 cm)for appliances -<10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and -<
50,000 Btuh (15 kW), 12 inches (30 cm) fol
appliances > 50,000 Btuh (15 kW)

C = Clearance to permanently closed window
D = Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm) from
the center tine of the terminal
E
F
G
H

=
=
=
=

Clearance
Clearance
Clearance
Clearance

to
to
to
to

unventilated soffit
outside corner
inside corner
each side of center tine

3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
3 feet (1.83 m)

extended above meter/regulator assembly
I = Clearance to service regulator vent outlet
J = Clearance to nonmechanicaI air supply inlet
to building or the combustion air inlet to any
other appliance

K = Clearance to a mechanical

air supply inlet

6 inches (15 cm)for appliances -< 10,000
Btuh (3 kW), 12 inches (30 cm)for
appliances > 10,000 Btuh (3 kW) and -<
100,00 Btuh (30 kW), 36 inches (91 cm) for
appliances >100,00 Btuh (30 kW)

6 inches (15 cm)for appliances -<10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and -<
50,000 Btuh (15 kW), 12 inches (30 cm) fol
appliances > 50,000 Btuh (15 kW)

6 feet (1.83 m)

3 feet (91 cm) above if within 10 feet (3 m)
horizontally

L = Clearance above paved sidewatk or paved
driveway located on public property

7 feet (2.13 m) 1

M = Clearance under veranda, porch deck, or
balcony

12 inches (30 cm) $

In accordance
In accordance

A vent

dwellings
_: Permitted
*

For

shall

with
with
not

and
only

the
the

current
current

terminate

CSA
ANSI

directly

B149.1
Z223.1
above

serves
both dweltings
if veranda,
porch,
deck,

clearances

not

specified

"Clearance

accordance

Figure

ANSI
with

Natural
/ NFPA

Gas and Propane
54 National
Fuel

a sidewalk
or balcony

Z223.!

or paved
is fully

/ NFPA

local
installation
manufacturer's

15. Vent Termination

Installation
Gas Code

driveway

open
or CSA

that

codes,
and
installation

Clearances

is located

a minimum

B149.1,

the

Code

of two
following

the requirements
instructions."

between
sides

beneath

statement
of the

two

gas

shall
supplier

single
the

family

floor.
be

included:

and

the

for Direct Vent Furnaces
15

escapethroughsuchappliancesor vents. Do
not ventthefurnaceto a fireplacechimneyor
buildingchase.
if removingan existingfurnacein a venting
system,theventingsystemmaynotbeproperly
sized.Totesttheventsystemwiththeremaining
appliances,followthe test outlinedbelow.

Combustion

The following steps shall be followed with each
appliance connected to the venting system
placed in operation, while any other appliances
connected to the venting system are not in

The quality of outdoor air must also be
considered.
Be sure that the combustion air
intake is not located near a source of solvent
fumes or other chemicals which can cause

operation:

corrosion

Vent Pipe Material
Vent and combustion air pipe and fittings must
be one of the following materials and must
conform to the indicated ANSI/ASTM standards:

Piping must be mechanically supported so that
its weight does not bear down on the furnace.
Supports must be at intervals no greater than
five feet, and at smaller intervals if necessary
to ensure that there are no sagging sections
to trap water (See Figures 16 & 17).

Material
Schedule 40 PVC
PVC-DWV
SDR-21
& SDR-26
ABS-DWV
Schedule 40 ABS
Foam/Cellular Core PVC

Standard
D1785
D2665
D2241
D2661
F628
F891

Cement and primer must conform to ATSM
Standard D2564 for PVC and Standard D2235
for ABS. When joining PVC piping to ABS, use
an appropriate solvent cement and procedure
per the piping manufacturer's recommendation
and ASTM Standard D3138.
Vent Pipe Installation
Pipe Routing and Support
Route piping as directly as possible between
the furnace and the outdoors and remember
that routing affects pipe length limitations per
Table 6. Locate the combustion air intake and
the vent exhaust in the same atmospheric
pressure zone - i.e. both must exit the building
though the same portion of exterior wall or
roof. Vent piping must be sloped upwards not
less than 1/4" per foot in the direction from the
furnace to the terminal. This is to ensure that
any condensate flows back to the furnace
where it can be disposed
of through the
condensate disposal system.

CAUTmON'.
occupied

air must
spaces

not be drawn
and

from

a corrosive

atmosphere.

of the furnace

combustion

system.

These
condensing
furnaces
have been
certified for installation with zero clearance
between vent piping and combustible surfaces.
However, it is good practice to allow space for
convenience in installation and service.
Location
of Outdoor
Terminations
Vent and combustion air intake terminations
must be located to ensure proper furnace
operation and to conform to applicable codes.
Figure 15 illustrates necessary distances from
the vent termination to windows and building
air intakes. In Canada, the Canadian Fue!
Gas Code takes precedence
over these
instructions.
Specifically,
all minimum
distance
requirements
with respect
to
term!nation
of the vent piping listed below.
The following list is a summary of vent terminal
location requirements:
I.
The termination must be 12 inches above
snow level or grade level whichever is
higher. See Figure 18 for alternate method
to achieve 12" above snow level.
2. The minimum distance for a direct vent

(2-pipe)
installation
from any door,
openable window, or air gravity inlet is I ft.
below, 1 ft. horizontally, or 1 ft. above.
The vent termination shall be a minimum of

3 ft. above any forced air inlet within 10 ft.
The vent termination shall be located at
least 4 ft. horizontally from any electric
meter, gas meter, regulator and any relief
equipment. These distances apply ONLY
to U.S. installations, in Canada, the Canadian Fuel Gas Code takes precedence.

Downflow Furnace
Vent

_!3

9/1E"_

÷i
Combustion

Al ,oto,oO,po l
Seal/Cat_lk
Around
Pipe
at Building

\
\

Supports
at Minimum
of
5 ft. Intervals
Straps
or Other Suitable

\
\

90 ° Elbow

7,8
i i

\
\

_-_j

___Z

\
'

Top View
Offset

with

Vent for Adequate
Dirnensiona_
C}eara#ce
Exhaust
Vent
PVC or
ABS pipe

f
Normal

Snow

Combustion
Level

Intake

Figure

Air
Pipe

16. Horizontal

Venting

Support
System
on Vertical Rise
Below

Joints
First support
close

¢//_

should

to furnace

Vent

be as

es possible

Vent

Upward Pitch
t/4" per foot

Figure
.

17. Vertical

Avoid areas where condensate drainage
may cause problems by dropping on plant_
ers or patios, etc. Also ensure that ex_
haust gases will not impinge on windows
or building surfaces, which may be com_
promised or damaged by condensation.
Do not install the vent terminal such that
exhaust is directed into window wells,
stairwells, under decks or into alcoves or
similar recessed areas, and do not terminate above any public walkways.

Venting
Select the point of wall penetration where
the minimum I/4 inch per foot of slope up
can be maintained.

CAUTmON'.
For optimal
performance
vent furnace
through wall which experiences
the least
exposure

to winter

winds.

Horizontal
Venting
Vent and combustion air intake terminations
must be as shown in Figure 19 unless the
concentric vent termination kit is used.

NG:
Ensure
the

that the combustion

exhaust

shown
in
termination

vent

Fig.
t9.
can cause

the flue gases.
vibration,

are

configured
Improper
recirculation

cases,

If you note these

oscillations

check the vent configuration.
that the exhaust
vent does
degree

vent
of

in furnace
contact
sensor.

occurring,
Make sure
not have a 90

termination.

For horizontal venting, either the Horizontal
Exterior Vent Mounting Kit or the Concentric
Vent Termination Kit may be used (See Table
12).
For Canadian installations please refer to the
Canadian Installation Code (CAN/CGA-B149.1
or 2) and/or local codes.
The HorizontaJ Exterior Vent Mounting Kit consists of two face plates and an insulating gasket to seal the exterior surface. A hole sized
closely to the pipe diameter must first be cut
through the wall. A short length of pipe is then
cut such that it can penetrate the wall and be
held in place by closely fitting standard couplings. The face plates are retained on both
sides of the waJJ by the couplings, and the
gasket is retained against the wail by the outer
face plate. Face plates must be fastened to the
walJ and the outside one must be flashed as
appropriate

to prevent entry of water.

When the above kits are not used the following
steps are required:
I.
Check the hole size cut through the exterior wall. Insure that the hole diameter is
less than the diameter of the couplings to
be used.

Extend the vent pipe through the wall
approximately
I" and seal the area between the wall and pipe.
Apply couplings to the vent pipe on the
interior and exterior sides of the wall to
insure the pipe can not be pushed or pulled
through the wall.
Insure the combustion air inlet pipe has a 90
degree termination elbow, and is pointing
downward as shown in Figures 19 & 20.

the furnace

will cycle, due to the intermittent
between the flame and the flame

air vent and

This may result

in severe

Note that a combustion

air intake must be

provided with an elbow opening downward.
When the vent pipe must exit an exterior wall
close to the grade or expected snow level, a
riser should be provided as shown in Figure 18.
Insulation is required to prevent freezing of this
section of pipe.
Vertical Venting
For verticaJ venting, either the configuration
shown in Figure 20 or the Concentric Vent
Termination Kit may be used. Vertical venting is
one of the shortest routing methods when
piping vents for furnaces. The M3 furnace
operates trouble-free when the furnace is installed with a shorter vent.
o The inlet for the combustion intake pipe must
be extended at least one foot above the roofline
or snow accumulation level.
o The outlet of the vent must be extended at least
10 inches above the inlet of the combustion air
intake pipe.
, The vent as well as the combustion air intake
pipe should be located on the same side of the
reel Both pipes must not be closer than 5
inches apart. They should not be separated
more than 36 inches.
The roof penetration must be properly flashed
and waterproofed with a plumbing roof boot or
equivalent flashing. Termination spacing requirements from the roof and from each other
must be per Figure 20.
Concentric

Vent

Terminatien

A concentric vent termination is approved for
use with these furnaces (See Table 12). For
proper installation of the concentric vent termination, follow the installation instructions provided with the kit.

Vent Configuration
to
Provide 12" Minimum
height
above
Snow Level.

<7_

Exhaust

Vent

12" Min.

Outside

Support

WaEI

12"Above

i_
I

NormaHy
Expected
Snow

1/2"

19" Nax.
// /_ Armaflex
f/ 4
S _ Bnsulation or
,

Level

:_ Equivalent

'_...............................
_
(if required)

Figure

18. A_ternate Horizontam
Vent Installation

Figure

19.

DRAINAGE OF CONDENSATE
FROM FURNACE

Do not install
additional
condensate
drain.

The condensate
produced
by the furnace
must be drained.
Do not connect awater
to

the

drainage

hose

the

NOTE: The condensate drain should be protected from freezing when in unheated spaces.
The furnace is supplied with an internal condensate drain trap.

A= 12" Above Roof or
Snow

Accumulation

Air

CAUTION'.

NG:
suppmy
furnace.

Exhaust and Combustion
Pipe Clearances

traps

in the

The condensate drain may exit through the left
side panel, the right side panel, or through the
left or right hole on the bottom panel. (See Figure
21). Ensure that the flexible drain hose is not
kinked.
The condensate should drain from the plastic
collector box (location A in Figure 21) as droplets or a small stream. If you notice the furnace
has operated for more than 5 minutes without
draining or the red status light on the control
board is pulsing a 2-blink code follow the steps
below.

s-Min.

36" l*_ax.

Note: If terminations

Level

meet-

ing these vertical requirements exceed the maximum

Elbow

height for safe transit, the
vent and combustion air intakes may be shipped with
the home for assembly on
site. The furnace must be

Bxheust
Plumbing
Vent
Roof Boot

labeled to notify the installer/
user not to use the furnace
until the vent and combustion air intake terminations
are installed.

(Typ. Both Pipes)

Figure 20.

Vertical

Vent Termination
19

direction

Figure
I.

Remove

21. Furnace

the collector

with Condensate

box soft tube at

location A in Figure 21 and insure the exit
from the collector box is clear of any
debris or obstructions.
2.

Replace this tube and insure the fit to the
header spout is air tight. Airwill be drawn into
the header if this connection is not tight.
Check other tube connections along the
drain system, insure that all are air tight.

NOTE: Industry research studies indicate that
when condensate is routed to an active drain,
household detergents, etc., buffer its acidity. If
the drain is not actively used or if codes require,
obtain a neutralizer kit (See Table 12). Proper
drains and connections to the condensate tub=

Drain Trap Assembty

readily accessible for service and/or emer=
gency use. Consult the local utility or gas
supplier for additional requirements regarding
placement of the manual main gas shut=off. In
the absence of local codes, the gas line instal=
lation must comply with the 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) or (CAN/
CGA B149) installation codes.
A drip leg should be installed in the vertical pipe
run to the unit. Table 7 lists gas flow capacities
for standard pipe sizes as a function of length
in typical applications based on nominal pres=
sure drop in the line.

ing are required as NORDYNE cannot be held
responsible for water leakage which occurs
due to loose hose connections or improperly
sealed drain line pipes.

NOTE: Gas piping must not be run in or through
air ducts, gas vents, etc.

GAS SUPPLY

Compounds used on threaded joints of gas
piping must be resistant to the actions of Iique=
fled petroleum gases.

AND

PiPiNG

General
This furnace is equipped for bottom, left, or
right side gas entry. Typical gas service hook=
ups are shown in Figure 22. When making the
gas connection provide clearance between the
gas supply line and the entry hole in the furnace
casing to avoid unwanted noise and/or damage
to the furnace.
All gas piping must be installed in compliance
with local codes and utility regulations. Some
local regulations require the installation of a manual
main shut=offvalve and ground joint union exter=
hal to the furnace. The shut=off valve should be

CAUTmON'.
Do not use matches,
lighters,
or other sources
of open flame
for gas

candles,
to check

leaks.

NOTE:
When pressure testing gas supply
lines at pressures greater than I/2 psig (14 in.
water column), the furnace must be disconnected from the gas supply piping system to
prevent damage to the gas control valve.

CONVERSION
This furnace can be converted

from the fac=

tory=equipped gas to either natural gas (for LP
gas ready models), or LP gas (for natural gas
ready models). Conversions must be made by
qualified service personnel, using only factory
authorized or approved parts. The required
conversion orifices are supplied with the fur=

Main

nace.

0/
/

WARNING:

\
NOT

REMOVE

ORIGINAL

RATING

/
J
!°

DEFACE

THE

PLATE.

Floor

CAUTION'.
The gas suppmy shammbe shut off prior to
disconnecting
before

the

proceeding

emectricam

power,

with the conversion.

To Gas
Supply

To Turn Off Fuel Supply
Figure

22.

Typical

Gas Piping

If the test pressure is less than or equal to I/2
psig (14 in. water column), the furnace must be
isolated from the gas supply line by closing the
manual shut=off valve.

Leak Check

After the gas piping to the furnace is complete,
all connections must be tested for gas leaks. To
check for leaks use only a soap and water solu=
tion or other approved method.

Set the room thermostat to "OFF" or its
lowest temperature setting.
Turn OFF the main gas supply to the appli=
ance at the manual valve, outside of the
appliance casing.
Remove the control access panel / Iou=
vered door.
Move the appliance gasvalve lever/knob to
the "OFF" position.
Turn OFF the electrical power to the appliance.
CAPACITY

High Altitude
Derate
The nameplate input rating for the furnaces
apply for elevations up to 4,000 feet above sea
level for US and Canada. If the elevation for the
furnace location is higher than 4,000 feet above
sea level, the furnace input must be derated by
using the appropriate
orifice size listed in
Table 8.
NOTE: The density of air decreases with increasing elevation above sea level. This re=
duces the quantity of combustion air drawn into
the furnace under normal operation and requires
the unit be derated by using smaller gas orifices
or lower manifold pressure.

to the Appliance:

OF BLACK

FOR NATURAL

IRON GAS PIPE
GAS (SPECIFIC

NOMINAL
BLACK

(CU. FT, PER HOUR)
GRAVITY

LENGTH

IRON

OF PiPE

-0.60)
RUN

(feet)

PIPE DIAMETER
(in.)

1/2

130

3/4

280

190

150

130

115

105

520

350

285

245

215

195

180

170

1 1/4

1050

730

590

500

440

400

370

350

1 1/2

1600

1100

890

760

670

610

560

530

The cubic feet per hour listed in the table above must be greater than
the cubic feet per hour of gas flow required by the furnace
To determine the cubicfeet per hourofgas fie \ _vrequired by the furnace,
divide the input rate of the furnace by the heating value of the gas:

Cubic Feet
Per Hour Required

hputTo Furnace_
Heating Value of Gas (Btu/Cu. Ft.)

Table 7. Capacity of BJack mron Gas Pipe
(cu. ft. per hour) for Natural Gas
(specific gravity = .60)
21

To Removethe Burner Assembly:
I.
2.
3.

4.
5.
6.
7.
8.

Followthe instructions"To Turn Off the
FuelSupplyto the Appliance."
Disconnecttheflamesensorwirefromthe
burnerbox.
Disconnectthe ignitorwiresat the 2 pin
plug.Thisis a lockingquickconnectand
bothsidesof the lowersectionmustbe
depressedin orderto be separated.
Removethe wiresfrom the terminalsof
the gas valve.
Disconnectthe rubber pressuretubes
fromthe gasvalveandthe burnerbox.
Removethe burneraccesscover plate
from the burnerbox.
Removesupplygas pipingfromthe gas
valve.
Carefullyremovethe burnerassemblyfastenersand removethe burnerassembly
fromtheappliance.Keepthefasteners
that
wereremoved.Notethattheburnerboxmay
havehooksnearthetopandontherightand
lefthandsides.Toremove
thistypeofburner
box,lift the burnerbox upwardsandthen
removetheboxfromtheunit.

CAUTmON'.
Caution:

If the

changed,

use only

Furnace
Plate

Rating
Input

(Btuh)

Elevation
No. of

orifice

the
size

burner
must

new orifices.
that will be

installed into the unit will depend upon the
type of conversion (sea level or Hgh altitude;
natural gas or LP gas}.
To Convert

the Unit to the Alternate

Gas

Remove the orifice bag from the manifold
of the unit.

Install the appropriate gas burner orifices
into the gas manifold.
Remember if installing at altitudes above 4,000 feet to
install the proper orifices, shown in Table
8. When installing the new orifices, DO
NOT use pipe joint compound on the
orifice threads. Screw the orifices into the
manifold by hand until snug to eliminate
cross threading,
then tighten with a
wrench. Before installing an orifice, check
the face or side of the orifice for the drill
number to ensure that it is the appropriate
size.
For the conversion to the alternate fuel,
the gas valve regulator cap must be turned
over, as shown in Figure 23. You will
unscrew the cap and reinstall for your in=
stallation. After reinstalling the cap, you will
be able to read "NAT" for the conversion to

natural gas or"LP for the conversion
gas.

Elevation
2000-4000

0 - 2000

re-drill

Note: The size of the new orifices

Furnace
Model Number
M3RL -

not

orifices.

To Removethe Burner Orifices:
Removethefour(4)fastenersthatsecure
the gas manifoldto the burnerbox, as
shownin Figure25. Carefullyremovethe
gas manifoldassemblyfrom the burner
box. Notethatthegasmanifoldassembly
consistsofthegasvalve,thegasmanifold,
andtheorifices.
2. Carefully
removetheburnerorificesfromthe
gas manifold,as shownin Figure25.

Elevation
4000-6000

Elevation
6000-8000

to LP

Elevation
8000-10000

Burners

Nat

060A-A/BW

60,000

080A-A/BW

80,000

1.15 mm

Table 8. Approximate

Orifice

Size for Natural

and LP Gases

Reinstalling
I.

the

Burner

Assembly:

Reinstal[ the gas manifold assembly to the
burner box with the four (4) fasteners,
which were removed earlier.

Carefully reinstall the burner box into the
unit. After installing the burner, inspect
the alignment of the burners with the heat
exchanger tubes. The center of the burners should be aligned with the center of the
tubes.

3.
4.

Reconnect the gas piping to the gas valve.
Reconnectthewirestothegasvalve
terminals.
Reconnect the rubber pressure tubes to the
gas valve and the burner box. Reinstall the
burner access cover plate.
Reconnect the ignitor at the 2 position
plug.
Reconnect the flame sensor wire to the
burner box.

6.
7.

Pressure

Gauge

Hoooywo,

Valve

PRESSURE

OTHER SIDE
OF CAP

REGULATOR

Figure

23. Convertible
Pressure
Regulator
Cap

installation

NOTE: For natural gas installations, the incoming gas line pressure at the gas valve inlet
must be between 4.5" WC and 10.0" WC. For
Figure

LP gas installations, the incoming gas line pressure at the gas valve inlet must be between
11.0" WC and 14.0" WC. This pressure can be
checked at the inlet end of the gas valve using
a pressure gauge or U-tube manometer, which
must
be installed
according
to the
manufacturer's
supplied instructions.

LiGHTiNG

AND ADJUSTMENT

24. Burner

Inspection

THE APPLIANCE
I.
2.

3.
4.

Turn ON the gas at the manual valve,
outside of the unit.
Check all gas connections for leaks with
a soap and water solution. If the solution
bubbles there is a gas leak which must be
corrected. Do NOT use an open flame to
check for gas leaks.
Turn ON the electrical power to the appD
ance.
Move the gas valve lever/knob to the "ON"
position. The lever/knob must be moved
to the end of its range of motion to insure
the valve is completely open. Use only
your hand to push in or turn the gas control
valve. Never use tools.

Burner

inlet

Box

Pressure
Tap

inlet

Gas
Valve

Cover
Plate

Figure 25. Typical Installation
For Sealed
Burner Box With Access Cover Plate
5.

Set the room thermostat to a point above
room temperature to begin the heating
cycle of the unit.
Check that the unit ignites and operates
properly. Refer to the installation instructions provided with your unit for the normal
operating sequence.

7. Aftertheflameignites,visuallyinspectthe
burnerassemblyto ensurethatthe flame
isdrawndirectlyintothecenteroftheheat
exchangertube,as shownin Figure23.
The end of the flamewill be out of sight
aroundthe bend of the heat exchanger
tube. Ina properlyadjustedburnerassembly, the flamecolor shouldbe blue with
somelightyellowstreaksnearthe outer
portionsoftheflame.
NOTE: Until all of the air is bled out of the gas
line, the hot surface ignitor may not ignite the gas.
If the ignition control locks out, turn the thermostat
to its lowest setting and wait one minute then turn
the thermostat to a point above room temperature
and the ignitor will try again to ignite the main
burners. This process may have to be repeated
several times before the burners will ignite. Once
the burners are lit, check all gas connections for
leaks again with the soap and water solution. If
the solution bubbles there is a gas leak which
must be corrected. Do not use an open flame to
check for gas leaks.
Manifold

Pressure

The gas valve for the M3 furnace series is
equipped with a special conversion
pressure regulator cap. The pressure regulator
cap is factory set. If the gas valve is converted from natural gas to propane gas or
vise versa, the manifold pressure of the gas
valve will be set to pressure listed in Table 9.
Type of Fuel

Manifold

avoid

electric

injury,
or death,
the disconnect
panel
before
connections.

ELECTRICAL

shock,

personal

turn off the power at
or the main
service
making

any

electrical

WIRING

Genera!
Electrical connections

must be made in accoF

dance with all applicable local codes and ordinances, and with the current revision of the
National Electric Code (ANSI/NFPA 70).
For Canadian

installations

electrical

connec-

tions and grounding must be done in accoF
dance with the current Canadian Electrical
Code (CSA C22.1 Part 1) and/or local codes. If
any of the original wire as supplied with the
furnace must be replaced, it must be replaced
with wire having a minimum temperature rating
of I05°C. Refer to the furnace nameplate and
Table 8 for electrical requirements.
Line Voltage Wiring
The line voltage (115 volt) to the furnace must
be supplied from a dedicated branch circuit
containing the correct fuse or circuit breaker
for the furnace. See Table 10. An electrical
switch should be readily accessible from and
within sight of the furnace.
See the Wiring
Diagram label in the furnace for more details.

3.5

The furnace

Propane (LP) Gas:

10.0

rupted, unbroken ground to minimize injury
should an electrical fault condition occur. The

COMPLETING

Natural Gas:

Table 9. Manifold

Pressure
In.WC

CAUTmON'.

THE

Pressure

CONVERSION

Affix the gas valve conversion label found
in the package with the orifices to the unit
rating plate.
Run the appliance through a complete
cycle to assure proper operation.

cabinet

must have an uninteF

controls used in this furnace require an earth
ground to operate properly. Acceptable methods for grounding are electrical wire or conduit
approved for electrical ground service. Do not
use gas piping as an electrical ground.
NOTE: Proper line voltage polarity must be
maintained in order for the control system to
operate correctly. Verify that the incoming neu-

tral lineis connectedto thewhitewireandthe
incoming"hot"line is connectedto the black
wireinthefurnacejunctionbox.Thefurnacewill
not operateunless polarityand groundare
properlyconnected.See Figure26.

Label

all wires

prior

Low Voltage Wiring
install the thermostat per the manufacturer's
instructions. The low voltage (24 volt) connec=
tions from the thermostat are made at the
terminal strip on the control board in the furnace.
See Figure 28 for the proper connections for
heating only (two=wire) and heating/cooling
(four=wire) applications.
The recommended
minimum wire gauge for thermostat wiring is
shown in Table 10.

to disconnection

when servicing
controls.
Wiring
errors
can cause
improper
and dangerous
operation.
Verify

proper

operation

after servicing.

c::_::_

C=_]

24 V

BowerOff
Til/mg
TWIN

_1®1
o1®1

_1®=_

Lors

des

operations

d'entretien

des

tousles
Toute

files
erreur

commandes,
_tiqueter
avant des les d_connecter.
de c_blage
danger

peut

_tre

une

source

et de panne.

S'assurer

bon

l'appareil

apr_s

fonctionnement

tout entretien.
Figure

27.

Blower

Speed Tap Location

Furnace

Cabinet

Nominal

Maximum

Minimum

Maximum

Minimum

Maximum

Input
(Btuh)

Width
(in.)

Electrical
Supply

Operating
Voltage

Furnace
Amperes

Wire
Gauge

Fuse or Circuit
Breaker Amps*

60,000

19.75

115-60-1

127

103

9.7

80,000

19.75

115-60-1

127

103

9.7

Recommended

Thermostat Wire Gauge

Thermostat

2-wire (heating)

24
22
20

55 ft.
90 ft.
140 ft.
225 ft.

Wire Length

4 or 5-wire (cooling)

25 ft.
45 ft.
70 ft.
1t0 ft.

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

F_/IS

;PerPvliied
e

10.

Electricam

Data

p aFnieel'
d Snupp/iteodr

Panel _
WhltB2aNk_tH_rOtl)_

Black

Green_orB_a_rE_ ......
(Ground)

_.......

_ ....

Black

_ .......

_-]

Black

._Ll_','

_ I

.....

Field Line Voltage
Wiring

Factory
Voltage

Line
Wiring

=
Ground

Ground

Field Supplied Disconnect
Within Sight of Furnace

Figure

26.

Line Voltage

Junction Box (may be internal
or external to the furnace). These
connections
can be made in the
field supplied disconnect
at the
furnace.

Field Wiring
25

The thermostatmust not be installedon an
outsidewaft or any other locationwhere its
operationmaybe adverselyaffected.Adverse
affectsincluderadiantloadingfromfireplaces,
sunlight,or lightingfixtures,and convective
loadingfrom warm air registersor electrical
appliances.

C°"dens'°gun't
!-

Condensing

F i
oo

E i

E::::_::_
Connect
R&W
For

C_=M

24=V

Blower Off
Fuse
3 Amp

Room
Thermostat

NOTB:The
"'Y"
terminal on the
UTEC control board
must be connected
to the thermostat
for proper cooling
mode operation.

2. Measurethecurrentflowonthethermostat
R-Wcircuitafterthecirculating
blowermotor
hasstarted.

_::=

Ventilation must be provided for homes built to
HUD Manufactured Homes Safety and Con=
struction Standards. This ventilation can be sup=
plied by the VentiiAire Ill or VentilAire iV accessories. (See Table 12). Alternate means to pro=
vide the ventilation air must meet the requirements of all applicable local and federal codes.

(Red)

C _

Neutrals

Unused Motor

The line voltage power leads are securely
connected, that the polarity of the con=
nections is correct, and that the furnace
is properly grounded.

The thermostat wires (R, W, Y, and G) are
securely connected to the correct leads
on the terminal strip of the circuit board.
The natural gas line service pressure must
not exceed 10.0 in. water column (0.36
psig), and must not be less than 4.5 in.
water column (0.16 psig). For LP gas the
line service pressure must not exceed 14
in. water column (0.51 psig), and must not
be less than 11.0 in. W.C. (0.40 psig).

The roll-out and vent safety manual reset
switches are closed. If necessary, press
the red button to reset a switch. See
Figure 26 for location. DO NOT install a
jumper wire across a switch to defeat its
function. If a switch reopens on start-up,
DO NOT reset the switch without identifying and correcting the fault condition which
caused the switch to trip.

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

The gas line has been purged
connections are leak tight.

Prior to start=up, verify that:
I.

Figure 28. Low Voltage Field,
Four=wire Heating/Cooling
Applications

AND ADJUSTMENTS

General

Leads

DD_DDD_

For installation of the VentiiAire Ill or IV, follow
the instructions provided with the VentilAire
kit.

START-UP

TWIN

Status Light 0

VENTiLATiON

Timing

Only

Addthe currentdrawof the systemcomponents;or

Setthe heatanticipatoraccordingto the thermostat manufacturer'sinstructionsfor heat
anticipatorsettings.

F,ame
Bignal
Light
0
(Yellow)

Heating

To checkthe heatanticipatorsettingeither:
I.

Unit

Start-Up
Procedure
I.
Set the thermostat

and all

to the lowest setting.

Close the disconnect(s)
voltage to the furnace.

to provide

line

Follow the procedures given on the operating instructions label attached to the
furnace.

Set the thermostat above room temperature and verify the sequence of operation.
(See the SEQUENCE OF OPERATION.)

After the furnace has run for approximately
five minutes, set the thermostat below room
temperature and verify steps 9 - 11 of the
SEQUENCE OF OPERATION.

See the "High Altitude Derate" section for
additional information on firing rate at elevations above 4,000 ft.

Shut Down Procedure

The gas valve regulator is set at a nominal
value of 3.5 in. water column for use with natural

in the event that the furnace must be shut down,
follow this procedure:

gas. The manifold pressure must be set at I 0.0 in.
water column for use with LP gas.

Set the room thermostat
lowest temperature

to "OFF" or its

setting.

Turn OFF the main gas supply to the appliance at the manual valve outside of the
appliance casing.

Remove the control access panel / Iouvered door.
Move the appliance gas valve lever/knob
to the "OFF" position.
Turn OFF
appliance.

the electrical

power

to the

Verifying
Firing Rate
The firing rate must be verified for each installation to prevent over-firing the furnace.
NOTE: The firing rate must not exceed the
rate shown on the furnace rating plate. At
altitudes above 4000 ft. it must not exceed
that on the rating plate mess 4% for each
1000 ft.
Use the following procedure
firing rate:

to determine

the

Shut off all other gas fired appliances.

Start the furnace and allow it to run for at
least three minutes.

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

Convert the time per revolution to cubic
feet of gas per hour using Table 11.

Multiply the gas flow rate in cubic feet per
hour by the heating value of the gas in Btu
per cubic foot to obtain the firing rate in
Btuh. Example:
o
Time for I revolution of a gas meter
with a I cubic foot dial = 60 seconds.
o
o

From Table 11 read 60 cubic feet per
hour of gas.
Heating value of the gas (obtained
from gas supplier) = 1000 Btu per
cubic foot.

Fidng rate = I000 x 60 = 60,000 Btuh.

Verifying
and Adjusting
Temperature
Rise
Verify that the temperature rise through the
furnace is within the range specified on the furnace rating plate. Temperature rises outside the
specified range could result in premature heat
exchanger failure.
Place thermometers in the return and supply
air stream as close to the furnace as possible.
The thermometer on the supply air side must
be shielded from direct radiation from the heat
exchanger to avoid false readings. Adjust all
registers and duct dampers to the desired
position and run the furnace for fifteen minutes
before taking any temperature readings. The
temperature rise is the difference between the
supply and return air temperatures.
For typical duct systems, the temperature rise
will fall within the range specified on the rating
plate with the blower speed at the factory
recommended setting. If the temperature rise
measured is outside the range specified, it may
be necessary to change the blower speed.
Lower blower speeds will increase the temperature rise and higher blower speeds will
decrease the temperature rise.
The furnace is equipped with a multispeed
motor. Heating and cooling speed selection is
made by moving the leads on the integrated
control board located in the furnace. The wiring
diagram on the furnace and Figure 30 show the
speed taps for adjusting motor speed.
If it is desired that the blower operate at the same
speed for heating and cooling, tape off the
terminal of the unused blower wire. Install the
jumper wire, found in the plastic instruction bag,
across the HEAT and COOL taps on the control
board. Reconnect the desired blower tap to the
piggyback quick connect.
The blower control is designed to start the
circulating air blower 30 seconds after the gas
valve is opened. The blower control is factory
wired to turn the blower motor off 120 seconds

GAS FLOW RATE (CUBIC FEET PER HOUR)
TIME FOR
ONE REVOLUTION
(SECONDSI
24
26
28
3O

CUBIC FEET PER REVOLUTION OF
METER
1
5
10
150
750
1500
138
692
1385
129
643
1286
120
600
1200

TIME FOR
ONE REVOLUTION
J

(sEcONDs)
8O
82
84
86

CUBIC

FEET PER REVOLUTION
METER

1
45
44
43
42

5
225
220
214
209

10
450
439
429
419

32
34
36
38
4O

113
106
100
95
90

563
529
500
474
450

1125
1059
1000
947
900

88
9O
92
94
96

41
40
39
38
38

205
200
196
191
188

409
400
391
383
375

42
44
46
48
5O

86
82
78
75
72

429
409
391
375
360

857
818
783
750
720

98
100

37
36
35
35
34

184
180
176
173
170

367
360
353
346
340

52
54
56
58
6O

69
67
64
62
60

346
333
321
310
300

692
667
643
621
600

33
33
32
32
31

167
164
161
158
155

333
327
321
316
310

62
64

58
56

290
281

581
563

31
3O

153
150

305
300

102
104
106
108
110
112
114
116
118
120

Table 11. Gas Flow Rate

after the gas valve is dosed. This timing can be
changed using the BLOWER OFF timing switch
opposite the terminal block on the control board
(See Figure 27).
Verifying Burner Operation
To verify operation of the burners, remove front
door and ensure that the door switch is in the "on"
position (see Figure 29). Set the thermostat above
room temperature and observe the ignition sequence. The flame can be observed through the
small clearwindow on the burner box. The burner
flame should carry over between all burners. The
flames should be blue, without yellow tips. Flames
should extend from each burner without lifting,
curling, or floating. After verifying ignition, set the
thermostat below room temperature and verify
that the burner flame extinguishes completely.
Replace the front door.
Verifying
Operation
Limit Switch

of the Supply

Air

To verify operation of the supply air limit switch,
make sure that the blower door is in place and
that there is power to the furnace. Completely
block the return airflow to the furnace by install=
ing a close=off plate in place of or upstream of
the filter(s). Set the thermostat above room

temperature and verify that the Sequence of
Operation is as described in these instructions.
The supply air limit switch should function to
turn off the gas valve within approximately five
minutes. The circulating air and combustion
blowers should continue to run when the supply
air limit switch opens. Remove the close=off
plate immediately after the supply air limit switch
opens. If the furnace operates for more than five
minutes with no return air, set the thermostat
below room temperature, shut off the power to
the furnace, and replace the supply air limit
switch.

DESCRiPTiON

OF COMPONENTS

Figure 29 shows the location of each of the
functional components described below. If any
component of the furnace must be replaced,
use only factory authorized replacement parts.
Contact your distributor for the approved re=
placement parts.
Flame

Sensor

- The flame

sensor acts to

prove that flame has carried over from the
ignitor to the opposite end burner. If no flame is
sensed, the furnace will be shut down automati=
cally.

FURNACE

ACCESSORY

Kit
A/C

KtTS

Order
Coil Box

Side

Number

911969A

Return Air Kit

904003
904015

Top Return Air Kit
Roof VentilAire

Ill Kit

914098

Sloped Roof VentilAire
Soffit VentilAire
Kit

IV Kit

914229

Sloped

Concentric

Vent

Termination

(for horizontal
and vertical
Horizontal
Exterior Vent

MAINTENANCE
It is recommended

WARNmNG'.

917201
Kit

903578

To avoid

902375

or death,
disconnect

ventin,q)

Mounting
Kit
3"PVC
Neutralizer
Kit - All Models

Table 12. Accessory

902377

that the furnace be checked

yearly. At a minimum, this check should include
the following items:

electric

before

shock,

personal

turn
off the
or the main

performing

any

power
service

injury,
at the
panel

maintenance.

Kits

Gas Vamve - The gas valve controls the flow of
gas to the burners. When the gas valve is
energized it automatically opens and regulates
the gas pressure in the manifold.
Pressure Switch - The pressure switch vealties that the inducer is drawing the combustion
gases through the heat exchanger. It alsosenses
a blocked condensate drain condition.

WARNING:
Holes in the vent pipe or heat exchanger
can cause products
of combustion
to
enter the occupied
space.
vent pipe or heat exchanger

found.
Failure to prevent
products
of
combustion
from being circulated
into
the occupied

Deck Limit Switch (Auxiliary
Limit) - The
deck limit protects the furnace filter temperature from overheating when the motor has
malfunctioned.
If the deck switch opens, the
power for the furnace will shut down (see
Figure 29).
Supply Air Limit Switch - The supply air limit
switch prevents the air temperature leaving the
furnace from exceeding the maximum outlet air
temperature.
Vent Safety Switch - The vent safety switch
shuts the furnace down if the outlet flue gas
temperature
increases
above 145°F. This
switch protects the plastic flue system and the
inducer from over-temperature
conditions.
Flame Roll-Out
Switch - This switch provides flame roll-out protection to the furnace
and combustion air inlet pipe.

Replace the
if leaks are

space

tially hazardous
carbon monoxide
result

in personal

can

crate

conditions,
poisoning,
injury

poten-

including
that could

or death.

Combustion
Air and Vent System
Check the combustion air and vent pipe to
ensure that it is not damaged, corroded or
blocked by debris. Any damaged section of
vent pipe must be replaced, and any obstruction or blockage must be removed prior to
operating the furnace.
Air Filter
An air filter is supplied with the furnace as
shipped from the factory.
Filters should be
changed or cleaned monthly during the heating
season. New or newly renovated homes may
require more frequent changing until the construction dust has been removed.

Do not store gasoline
or any other
flammable vapors and liquids in the vicinity
of the furnace.
Never

operate

the

furnace

without

a
Change or replace the air filters monthly
during any period when the circulating
blower is operating regularly.

filter Jn pmace. Dust and mintJn the return
air

can

nents,

buJmd up on Jntemam comporesumtJng

equipment

Jn moss of efficiency,

damage,

and possJbme fire.

Always replace the doors on the furnace
after servicing. Do not operate the furnace

Lubrication

without

The bearings in the circulating air blower motors are prequbdcated and sealed at the factory. No further oiling of the bearings is required
for the life of the motor.

Avoid operating the furnace when windows
and doors are open.

Condensate
Drain AssemMy
Be sure the condensate lines are free and open
(i.e. avoid kinking hoses). Also make sure all
hose clamps are tight to avoid drawing air into
the system.
Blower Compartment
The blower compartment should be cleaned
monthly during the heating and cooling seasons to remove any dirt and lint that may have
accumulated
in the compartment or on the
blower and motor. Dirt and lint can create
excessive loads on the motor resulting in higher
than normal operating temperatures and shortened service life.
Heat Exchanger and Burner Maintenance
The furnace should operate for many years
without excessive soot buildup in the flue passageways, however, the flue passageways,
the vent system, and the burners should be
inspected and cleaned (if required) by a qualified service technician annually to ensure continued safe operation. Particular attention must
be given to identify deterioration from corrosion
or other sources.

SYSTEM OPERATION
iNFORMATiON
GENERAL
Proper maintenance is most important to
achieve the best performance from a
furnace. Follow these instructions for years
of safe, trouble free operation.
o Do not place combustible materials on or
against the furnace cabinet or the vent pipe.

all doors and covers in place.

Be sure that the thermostat
is propermy
installed
and is not being affected by
drafts or heat from mamps or other
appliances.
Sequence
of Operation
Operating sequences for the heating, cooling,
and fan modes are described below. Refer to
the wiring diagrams (Figures 30) and the low
voltage field wiring diagram (Figure 26) for
more details.
Heating Mode:
I.
On a call for heat the thermostat closes,
applying 24 VAC to the W terminal on the
control board.
2.

The control board checks
on the 24 VAC limit control
temperature
limit switch,
switches and blocked vent

for continuity
circuit (overflame rollout
switch in se-

ries). If an open limit is detected the control board will energize the inducer and
the conditioned air blower. All other system functions win be inoperable until the
limit circuit closes. While the limit is open,
the red LED will pulse at a rate of I blink
per unit time.
The furnace control checks for continuity
across the pressure switch (24 VAC). If
the pressure switch is closed the heat
mode sequence will not continue. If it
remains closed for 10 seconds the red
LED will blink 3 times repetitively
fault condition clears.

until the

4. The inducer is energized.
5. The pressure switch win close. If the
pressure switch does not close after 10
seconds the fault LED will blink 2 times
repetitively and the inducer will continue
to run until the switch is closed.
6. The inducer will pre-purge for 30 seconds
and then the igniter will start its warm-up
as follows:

InitialPowerup:After30secondsofigniter
warm-upthegasvalve(24VAC)will then
open. The igniter circuitwill stay energized for 3 secondsafter the gas valve
opens.
After InitialPowerup: The controlhas a
programmedadaptive ignition feature
which variesthe warm-upperiodas follows:Ifignitionissuccessful
thewarm-upis
reducedby3-seconds
oneachsubsequent
call for heat until ignitionfailure occurs.
Uponignitionfailure,the warm-upis increasedby 3-secondson the nexttry. If
successful,thetimingremainsfixedatthis
level.Ingeneral,wheneverignitionfailure
occursthewarm-upintervalisincreasedby
3-secondsonthe nexttry.Andifsuccessful, it remainsthere.Minimumandmaximumwarm-uptimelimitsareset at6 and
54-seconds,
respectively.
7. Thefurnacecontrolmustproveflamevia
the flamesensor5 secondsafterthe gas
valveopens.If flameis sensed,all burners areon andthe ignitorcoolsoff. If no
flame is sensed,the gas valve closes
immediatelyandthe inducercontinuesto
run. A secondtrial for ignition(step 6)
beginsif noflameis sensed.Onthefifth
tryforignition,thefurnacecontrolislocked
out and the red LEDwill blink 4 times
repetitively. The thermostat must be
openedfor at leastten secondsto reset
the furnacecontrolaftera lockout. Otherwise,the furnacewill attemptanother
ignitionsequencein 1 hour.
8. The furnace control energizesthe circulatingair bloweron the heatingspeed
30 secondsafterthe gasvalvecircuitis
energized.
9. When the thermostat has been satisfied,
gas valve is de-energized.
10. The inducer is de-energized
after a 30second postpurge.
11. The furnace control keeps the circulating
air blower energized for 120 seconds
(factory set) or 60, 90, or 180 seconds
(field adjustable). (See Figure 27.)
12. Abnormal conditions: If a limit opens during
operation, the inducer and circulating air
blower continue to operate. The gas valve
is de-energized immediately. The blowers
continue to operate until the limit closes.
When the limit closes the inducer blower is
de-energized immediately. The circulating
air blower continues to operate for the specified delay (factory set at 120 seconds).

Cooling Mode:
I.
On a call for cooling the thermostat closes,
applying 24 VAC to the G and Y terminals
on the furnace control. This closes the
2.

compressor contactor.
The furnace control energizes the circulating blower (115 VAC) on the cooling
speed.
When the thermostat is satisfied, the G
and Y terminals on the control board are
de-energized
opening the compressor
contactor.
The circulating air blower is de-energized
after a 90-second delay.

Fan Mode:
I.
On a callforfan

operation, the thermostat
applies 24 VAC to the G terminal on the
furnace control board.

The circulating air blower is energized
immediately on the heating speed.
If the furnace is operated in the continuous ON position at the thermostat and is
then switched to AUTO, the circulating
blower will operate for a specified delay
(factory set at 120 seconds).

Furnace Fails to Operate
If the furnace does not operate check the
following:
I.
Is the thermostat operating properly?
2. Is the front door in place?
3. Is the furnace disconnect closed?
4.
5.
6.
7.
8.
9.

Has the circuit breaker tripped or the
control board fuse burned open?
Is the gas turned on?
Are any manual reset switches open?
Is the filter dirty or plugged?
Is the flame sensor coated? (Remove
and clean with emery cloth.)
Is the deck switch open?

If the furnace locks out after 5 attempts for
ignition, it will try again every hour if a call for
heat remains. If the inducer and circulating air
blowers are operating, and items I through 8
have been checked, press the red reset button on the vent safety switch. (See Figure 29.)
If the furnace operates after depressing the
reset button, contact a qualified service technician to identify and repair the problem.
If furnace still fails to operate, depress the red
reset buttons on the flame roll-out switch. If
the furnace operates after depressing
the
reset button, contact a qualified service technician to identify and repair the problem.
31

M3 Dewnflow

Door Assembly

- Louvered

Furnace

Ignitor

Filter Inside Door

BurnerView

Blower Assembly

Main Limit Switch

Control Board

Coil Cabinet

Pressure Switch

Flame

Flame Rollout Switch

Gas Valve

"J" Trap Hard Tube

Switch,

On/Off

LowVoltage

Blower,

Inducer

In Line Drain Assembly

Orifice(In

Aux.

10 Junction

Transformer

Box

Port

29. Location

of Major

Assembly

Sensor

Limit

Components

(Optional)

(On Burner

BurnerBox)

BurnerBox

11 Vent Safety Switch

Figure

Assembly

Box)

FAULT

CONDmON

Power
Limit

On
Circuit

(Does

STATUS
RED
LUGHT
ON

Open

not apply

or External

to Deck

Pressure

Switch

Open

Pressure

Switch

Closed

!gn!t!on

Fai!ure

115 VAC
False
Power

Off

FAULT
Low

Flame

Switch,
with

(Check

& Neutral

Flame

or Gas
or Deck

Load

with

Inducer

On
On

or no Ground
Relay

Sensor

3 FLASHES

5 FLASHES
Continuous
OFF

Shorted

Open

FLAME
YELLOW
LIGHT

CONDITION

Flame

2 FLASHES
4 FLASHES

Ground)

Valve

I FLASH

see below)

Inducer

Reversed

Limit

On "W"

tf any of the originat
wire as supplied with
the furnace must be
replaced, it must be
replaced with wiring
materiaJ having a
temperature rating of
at least 105" C.

MOTOR
PLUG

Factory Wired
Heating Speeds
Furnace

Wire

Input, Btuh

Cotor

60,000

Red

80,000

Blue

Use copper
conductors
only,

Continuous
Flash
ON

Signal

Present

WD#7i0240B

Figure

30.

Downflow

Furnace

Wiring

Diagram
33

INSTALLATION/PERFORIVlANCE

CHECK

LIST

LOCATION

CITY

STATE

INSTALLER

CITY

STATE

UNIT MODEL NUMBER

UNIT SERIAL NUMBER

Minimum Clearances

Are Flue Connections

per Table 3?

Electrical Connections

tight?

Is there Proper Draft?

Line Voltage Polarity correct?

Is Vent free from restrictions?
Volts

Supply Voltage:
Blower Motor HP:

Is the Filter(s) secured in place?
Is the Filter(s) clean?

FUEL TYPE:
Natural Gas

LPiPropane

Gas Piping Connections

leak-tested?

Has the Thermostat
__

Is the Thermostat

Gas Line Pressure:

been calibrated?

level?

Is the Heat Anticipator

Setting correct?

(in. water column, with furnace operating)
Manifold Pressure:
Has the Owner's Information

(in. water column, with furnace operating)
Is there adequate fresh air supply for
combustion and ventilation?

Furnace Input:

(Btuh)

Supply Air Temperature:

(° F)

Return Air Temperature:

(° F)

Temperature

(° F)

Rise:

been reviewed

with the home-owner?

Has the Literature Package been left near the
furnace?

708219D
7082t9D

O'Fallon,

NORDYNE

(Replaces

708219C)

Specifications and illustrations subject to change without
notice and without incurring obligations. Printedin
US.A. (04/04)

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NORDYNE Furnace/Heater, Gas Manual L0523341

M3RL Series L0523341

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