N8MPN100F14B1 44108201001

User Manual: N8MPN100F14B1

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MULTI POSITION

SINGLE STAGE

2--STAGE

GAS FURNACES

Part Number

441 08 2010 01

N8MPN, N8MPL, *8MPN, *8MPL,

*8DNL, *8MPT & *8MPV

Manufactured by:

This manual supports condensing gas furnaces manufactured in 2003

ã2001 International Comfort Products Corporation (USA) 10/2004

N8MPN -- Non--Condensing Single Stage

N8MPL -- Non--Condensing Single Stage Low Nox

*8MPN-- Non--Condensing Single Stage Deluxe

*8MPL-- Non--Condensing Single Stage Deluxe Low Nox

*8DNL -- Non--Condensing Single Stage Downflow

*8MPT-- Non--Condensing Two Stage PSC Motor

*8MPV-- Non--Condensing Two Stage Variable Speed

* Denotes Brand (T, C or H)

Service Manual

Multi Position Furnace

TABLE OF CONTENTS

1. INTRODUCTION 2............................................................

2. UNIT IDENTIFICATION 2.....................................................

3. FURNACE THEORY OF OPERATION 3........................................

4. ELECTRICAL SUPPLY 4......................................................

5. INTERLOCK SWITCH 5......................................................

6. GAS SUPPLY 6..............................................................

7. BURNERS 8................................................................

8. L.P. PRESSURE SWITCH 8...................................................

9. HIGH ALTITUDE OPERATION 9...............................................

10. CHECKING TEMPERATURE RISE 9..........................................

11. ROOM THERMOSTATS 10....................................................

12. CONTROL WIRING 11.......................................................

13. TWINNING KITS 11..........................................................

14. LIMIT SWITCHES 11.........................................................

15. PRESSURE SWITCHES 12...................................................

16. ST9160B -- UNIQUE CONTROL FUNCTIONS/RESPONSES 16...................

17. HONEYWELL SV9541M GAS VALVE/IGNITION SYSTEM 17.....................

18. HONEYWELL SV9541M SYSTEM OPERATION 17..............................

19. CHECKING FLAME CURRENT 17.............................................

20. CAPACITORS 17............................................................

21. BLOWER ASSEMBLY 17.....................................................

22. HEAT EXCHANGER REMOVAL/REPLACEMENT 20.............................

SV9541M “SMART VALVE” -- Sequence of Operation 21.............................

SV9541M “SMART VALVE” -- Trouble shooting 23...................................

SV9541M “SMART VALVE” -- Electrical Variation 25.................................

WIRING DIAGRAM 26...........................................................

TECHNICAL SERVICE DATA (N8MPN) 30.........................................

TECHNICAL SERVICE DATA (N8MPL) 31..........................................

TECHNICAL SERVICE DATA (*8MPN) 32..........................................

TECHNICAL SERVICE DATA (*8MPL) 33..........................................

TECHNICAL SERVICE DATA (*8DNL) 34..........................................

TECHNICAL SERVICE DATA (*8MPV) 35..........................................

TECHNICAL SERVICE DATA (*8MPT) 36..........................................

BLOWER PERFORMANCE DATA 37..............................................

APPENDIX OF HELPFUL INFORMATION 43.......................................

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

1. INTRODUCTION

This service manual is designed to be used in conjunction

with the installation manual and/or technical support manual

provided with each furnace.

These furnaces represent the very latest in mid--efficiency

gas furnace technology. Consequently, they incorporate the

use of certain controls that contain highly sophisticated elec-

tronic components which are not user serviceable. there-

fore,itisessentialthatonlycompetent,qualified, serviceper-

sonnel 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 any malfunction of this product.

This servicemanual coversour newmulti--positionfurnaces.

The overall operation of all of these models is essentially the

same.

This manual, therefore, will deal with all subjects in ageneral

nature (I.E. all text will pertain to all models) unless that sub-

ject is unique to a particular model or family, in which case it

will be so indicated.

The information contained in this manual is

intended for use by a qualified service technician

who is familiar with the safety procedures required

in installation and repair and who is equipped with

the proper tools and test instruments.

Installation or repairs made by the unqualified

persons can result in hazards subjecting the

unqualifiedpersonmakingsuchrepairstotheriskof

injury or electrical shock which can be serious, or

even fatalnotonly tothem, butalso 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 damage which may result to you or others.

We will not be responsiblefor anyinjury orproperty

damage arising from improper installation, service

and/or service procedures.

2. UNIT IDENTIFICATION

The unit’s rating plate contains important information for the

service technician. It also lists the complete Model Manufac-

turing and Serial Numbers.

These complete numbers are required to obtain correct re-

placement parts (example, in certain model families a unit

having a MARKET REVISION of “C” is likely to be equipped

with one or more different components.

MODEL NUMBER IDENTIFICATION GUIDE

* 8 MP D075 B12 A 1

Brand Identifier Engineering Rev.

T=Tempstar Denotes minor changes

C = Comfortmaker Marketing Digit

H=Heil Denotes minor change

A = Arcoaire

X = Evaluation Cooling Airflow

Brand Identifier 08 = 800 CFM

8 = Non--Condensing, 80+% Gas Furnace 12 = 1200 CFM

9 = Condensing, 90+% Gas Furnace 14 = 1400 CFM

Installation Configuration 16 = 1600 CFM

UP = Upflow DN = Downflow UH = Upflow/Horizontal 20 = 2000 CFM

HZ = Horizontal DH = Downflow/Horizontal

MP = Multiposition, Upflow/Downflow/Horizontal Cabinet Width

Major Design Feature B = 15.5²Wide

1 = One (Single) Pipe N = Single Stage F = 19.1²Wide

2=TwoPipe P=PVCVent J = 22.8²Wide

D = 1 or 2 Pipe T = Two Stage L = 24.5²Wide

L = Low NOx V = Variable Speed Input (Nominal MBTUH)

Multi Position Furnace Service Manual

3441 08 2010 01

Component Locations for Four Position Furnaces

Figure 1

25--24--30V

Gas Valve

Main Burners

Circulating Blower

Motor

Heat Exchanger

Combustion

Blower

Circulating Blower

Fan/Delay

Control

Manual Gas

Valve

Pressure Switch

(2 switches on some

models)

Representative drawing only, some models may vary in appearance.

Rating

Plate

Drip Leg

3. FURNACE THEORY OF OPERATION

Thehigh efficiencies andlower profile(compared toprevious

series)of thisfurnace havebeenobtainedusingdesigntech-

niques not typical of traditional furnace designs. A brief de-

scription of these new design techniques and the purpose

they serve follows.

1. Reducing the height of the furnace while maintaining

the high efficiency of pervious models required main-

taining the surface area of the heat exchanger and yet

minimizing the overall size.

The design required to achieve these results is the “SER-

PENTINE”design,whereinthefluegassesmustfollowaser-

pent shaped passage through the heat exchanger via con-

vection.

This “Serpentine” path is resistive to normal convective flow,

and requires that a partial vacuum be created at the outlet of

the heat exchanger to maintain the flow of flue products

through the heat exchanger.

2. The serpentine heat exchanger design does not lend

itself well to the ribbon type, or slotted port type burner

foundin moretraditionaldesignfurnaces for thefollow-

ing reasons:

A. The flame “height” of a ribbon or slotted port type

burner would make it difficult (if not impossible) to

prevent impingement of the flame on the heat ex-

changer surfaces whole maintaining the low profile

heat exchanger.

For these reasons, an “INSHOT” type burner is used in this

series. The inshot burner (also called a “jet” burner) fires a

flame straight out its end. This burner is designed to fire into

a tube style heat exchanger, making it an ideal application in

the tube--like passages of the serpentine heat exchanger.

3. To overcome the resistance to convective flow of the

heat exchanger requires the use of an Induced Draft

Combustion Blower Assembly.

4. The Combustion Blower Assembly is mounted on the

outletsideoftheheatexchanger,Thisblowercreatesa

partial vacuum (negative pressure) within the heat ex-

changers drawing the flue products out of the furnace.

5. A pressure switch (Air Proving Switch) is used as a

safetydevicethat preventsthe ignitionsystem from fir-

ing the furnace until it senses that a proper draft has

been established through the furnace.

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

4. ELECTRICAL SUPPLY

ELECTRICAL SHOCK HAZARD.

Failure to do so can result in death, personal injury

and/or property damage.

Turn OFF electric power at fuse box or service panel

before making any electrical connections and en-

sure a proper ground connection is made before

connecting line voltage.

SUPPLY CIRCUIT

The furnace cannot be expected to operate correctly unless

it is properly connected (wired) to an adequately sized (15

amp.) single branch circuit.

SUPPLY VOLTAGE

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

It MUST be between 97 volts and 132 volts. Supply voltage

to the furnace should be checked WITH THE FURNACE IN

OPERATION. Voltage readings outside the specified range

can be expected to cause operating problems. Their cause

MUST be investigated and corrected.

ELECTRICAL GROUND

GroundingoftheelectricalsupplytoALLFURNACESISRE-

QUIRED for safety reasons.

CHECKING GROUNDING AND POLARITY

Grounding may be verified as follows:

1. Turn the power supply “OFF”.

2. Using an Ohmmeter check for continuity between the

Neutral (white) wire and Ground wire (green) of the

supply circuit.

3. With the Ohmmeter set on the R x 1scale, the reading

should be zero Ohms.

4. A zero Ohm reading indicates that the neutral is

grounded back to the main panel.

5. An alternate check would be to check for continuity

from the Neutral to a cold water pipe, (Pipe must be

metal,and must havea continuous, uninterruptedcon-

nection to ground) or to a continuous, uninterrupted

connection to ground) or to a driven ground rod.

6. AnyreadingsotherthanzeroOhmswould indicatea

poor ground, or no ground.

Polarity may be verified as follows:

1. Turn the power supply “ON”.

2. Using a Voltmeter check for voltage between the Hot

(Black) and Neutral (White) wire of supply circuit.

POLARITY

CORRECT POLARITY of the line voltage supply to all fur-

naces is also required for safety reasons.

3. Reading should be Line (Supply) Voltage.

4. Check for Voltage between the Neutral (White) wire

and Ground wire of the supply circuit.

5. Reading should be zero Volts. (if line voltage is read,

polarity is reversed)

6. A zero Volt reading indicates there is no voltage poten-

tial on Neutral wire.

7. Double check by checking for voltage between the Hot

(Black) wire and Ground wire of the supply circuit.

8. ReadingshouldbeLine (supply)Voltage.(ifzerovolts

is read, there is no ground, or polarity is reversed.)

Figure 2 Electrical Connections

Single Stage

25--24--33

NOTE: 115 VAC/60Hz/single--phase

Operating voltage range*: 127 max, 104 min.

* Permissible limits of voltage at which unit will operate satisfactorily

115V. 60Hz.

Connectio

Box

Ground

HOT

NEUT.

Thermostat

Low Voltage

Terminal Board

Multi Position Furnace Service Manual

5441 08 2010 01

Figure 3 Electrical Connections

*8MPV

NOTE: Junction Box can be mounted to either the left or right side.

24--24--33a

NOTE: 115 VAC/60Hz/single--phase

Operating voltage range*: 127 max, 104 min.

* Permissible limits of voltage at which unit will operate satisfactorily

Ground

115V. 50 Hz.

Correction

Box

Two Stage

Thermostat

Low Voltage

Terminal Board

Low Voltage

Terminal Board

Single Stage

Thermostat

HOT

Figure 4 Electrical Connections

*8MPT

NOTE: Junction Box can be mounted to either the left or right side.

25--24--33

NOTE: 115 VAC/60Hz/single--phase

Operating voltage range*: 127 max, 104 min.

* Permissible limits of voltage at which unit will operate satisfactorily

115V. 50 Hz.

Low Voltage

Terminal Board

Low Voltage

Terminal Board

Correction

Box

Two Stage

Thermostat

Single Stage

Thermostat

Ground

HOT

NEUT.

5. INTERLOCK SWITCH

The blower compartment door of all models is equipped with

an interlock switch. This switch is “Normally Open” (closes

when the door is on the furnace) and interrupts furnace op-

eration whenthe dooris open. This interlock switch is asafe-

ty device, and SHOULD NEVER BE BY--PASSED.

Since this is a single pole switch, (breaking only one side of

the line) properline voltage is essential to insure that furnace

components are not “HOT” when switch is open. (See

Checking Grounding and Polarity)

Figure 5 Typical Interlock Switch

10--12--96

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

6. GAS SUPPLY

Typical Gas Valve HoneywellFigure 6

dwg 25--23--31a

INLET

Manifold Pressure

Adjustment

Pilot Pressure

Adjustment (Hidden)

On\Off

Switch

Diagnostic Light

OUTLET Single Stage

INLET

OUTLET Gas

Supply

Pressure

Tap on

Inlet

Boss

Behind

Coil

Two--Stage

An adequately sized gas supply to the furnaceis requiredfor

properoperation.Gaspipingwhichisundersizedwillnot pro-

videsufficientcapacityforproper operation.Pipingshouldbe

sized in accordance with accepted industry standards.

NATURAL GAS

Inlet (Supply) pressure to the furnace should be checked (at

the gas valve) with ALL OTHER GAS FIRED APPLIANCES

OPERATING. Inlet (Supply) pressure to the furnace under

these conditions MUST be a minimum of 4.5²W.C. (Water

Column). If the inlet pressure is less, it may be an indication

of undersized piping or regulator problems.

LP GAS

Inlet (Supply) pressure to the furnace should be checked in

the same manner as for Natural Gas, however with LP Gas,

the inlet pressure MUST be a minimum of 11²W.C. If this

cannot be obtained, problems are indicated in either the reg-

ulator or pipe sizing.

Table 1 Gas Pressures Below 2000¢

¢¢

Gas

Supply Pressure Manifold

Type Recommended Max. Min. Pressure

Natural 7²14²4.5²3.5²

LP 11²14²11²10²

Important Note:

·With Propane gas, the rated input is obtained when the

BTU content is 2,500 BTU per cubic foot and manifold

pressure set at 10²

²²

²W.C.

·If Propane gas has a different BTU content, orifices

MUST be changed by licensed Propane installer.

·Measured input can NOT exceed rated input.

·Any majorchange ingas flowrequires changing burner

orifice size.

CHECKING INPUT (FIRING) RATE

Once it has been determined that the gas supply is correct

to the furnace, it is necessary to check the input (firing) rate,

This can be done in two (2) ways. First by checking and ad-

justing (as necessary) the manifold (Outlet) pressure. The

second way is to “Clock” the gas meter.

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas at shut off before

connecting manometer can result in death,

personal injury and/or property damage.

Turn OFF gas at shut off before connecting

manometer.

Multi Position Furnace Service Manual

7441 08 2010 01

Gas Pressure Testing Devices

Figure 7

MAGNEHELIC

MAX. PRESSURE 15 PSIG

510

INCHES OF WATER

Pressure Connections

Typical "U" Tube

Manometer

CHECKING MANIFOLD PRESSURE For Single Stage

1. Connect a manometer or Magnehelic gauge (0--12²

W.C. range) to the pressure tap on the “OUTLET” side

of the gas valve.

2. Turn gas “ON”, fire the furnace, and remove adjust-

ment cover (screw--cap).

3. Turn adjustment screw clockwise (IN) to INCREASE

pressure, andcounterclockwise(OUT) to DECREASE

pressure.

4. At altitudes BELOW 2,000¢

¢¢

¢set manifold pressure to

3.5²W.C. for Natural Gas, and 10²W.C. for LP Gas.

5. For Natural Gas units ABOVE 2,000¢

¢¢

¢, set manifold

pressure according to Table 2.

6. For LP Gas units ABOVE 2,000¢

¢¢

¢, insure that orifice

size has been changed (per “National Fuel Gas Code”

-- Appendix “F”) if gas supply has not already been de--

rated for altitude by the gas supplier.

7. For ALL UNITS ABOVE 8,000¢, contact the factory for

SPECIFIC de--rating information.

CHECKING MANIFOLD PRESSURE for Two Stage

1. Connect manometer or Magnehelic gauge to the

tapped opening on the outlet side of gas valve. Use a

manometer with a 0 to 12²minimum water column

range.

2. Turngas ON.Operatethe furnaceonhighfirebyusing

ajumper wireontheRtoW1& W2thermostatconnec-

tions on the fan board.

3. Remove the adjustment cover on the gas valve. Turn

adjusting screw counterclockwise to decrease the

manifold pressure and clockwise to increase. See

Figure 6.

4. Set the manifold pressure to value shown in Table 1 or

Table 3.

5. Operate the furnace on low fire by using a jumper wire

on the R to W1 thermostat connections on the fan

board.

Note: The fourth (4th) DIP switch should be in the on

position to set the low fire manifold pressure. (See wir-

ing digram)

6. Repeat steps 4 and 5 for low fire operation.

7. When the manifold pressures are properly set, replace

the adjustment screw covers on the gas valve.

8. Remove the jumper wires from the thermostat connec-

tions on the fan board. Remove manometer and re-

place plug in gas valve.

9. Reture fourth (4th) DIP switch to previous setting.

10. Replace the burner compartment door.

MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS For Single Stage

Table 2 NATURAL GAS

Elevation Above Sea Level

eat

Btu/Cu.Ft. 0--1999

(²

²²

²×

××

×wc) 2000--2999

(²

²²

²×

××

×wc) 3000--3999

(²

²²

²×

××

×wc) 4000--4999

(²

²²

²×

××

×wc) 5000--5999

(²

²²

²×

××

×wc) 6000--6999

(²

²²

²×

××

×wc) 7000--7999

(²

²²

²×

××

×wc)

800 3.5 3.5 3.5 3.5 3.5 3.5 3.5

850 3.5 3.5 3.5 3.5 3.5 3.5 3.5

900 3.5 3.5 3.5 3.5 3.5 3.5 3.4

950 3.5 3.5 3.5 3.5 3.3 3.2 3.1

1000 3.5 3.4 3.3 3.2 3.0 2.9 2.8

1050 3.2 3.1 3.0 2.9 2.7 2.6 2.5

1100 2.9 2.8 2.7 2.6 2.5 2.4 2.3

Orifice Size #42 #42 #42 #42 #42 #42 #42

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS For Two-Stage

Table 3 High Altitude Pressure Chart

2000--8000 ft. (Natural Gas)

Elevation Above Sea Level

Heat

alue

0--1999 2000--2999 3000--3999 4000--4999 5000--5999 6000--6999 7000--7999

.High Low High Low High Low High Low High Low High Low High Low

800 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7

850 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7

900 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.4 1.7

950 3.5 1.7 3.5 1.7 3.5 1.7 3.5 1.7 3.3 1.6 3.2 1.6 3.1 1.5

1000 3.5 1.7 3.4 1.7 3.3 1.6 3.2 1.5 3.0 1.5 2.9 1.4 2.8 1.4

1050 3.2 1.6 3.1 1.5 3.0 1.5 2.9 1.4 2.7 1.3 2.6 1.3 2.5 1.2

1100 2.9 1.4 2.8 1.4 2.7 1.3 2.6 1.3 2.5 1.2 2.4 1.2 2.3 1.1

Orifice Size #42 #42 #42 #42 #42 #42 #42

“CLOCKING” GAS METER (NATURAL GAS)

1. Check with gas supplier to obtain ACTUAL BTU con-

tent of gas.

2. Turn “OFF” gas supply to ALL other gas appliances.

3. Timehowmanysecondsittakesthesmallest(normally

1cfh)dialonthegasmetertomakeone completerevo-

lution.

4. Calculate input rate by using ACTUAL BTU content of

gas in formula shown in example.

Example

Natural Gas

BTU Content No. of Seconds

Per Hour Time Per Cubic

Foot in Seconds BTU Per

Hour

1,000 3,600 48 75,000

1,000 x 3,600 ¸48 = 75,000 BTUH

7. BURNERS

Burners used in this series of furnace are of the “INSHOT”

type. Their operation can be compared to that of a torch in

that they produce a hard, sharp, somewhat noisy flame.

Noise should not be an issue, however, because of the

closed compartment design. In order to insure that the burn-

ers are operating properly, and at their design noise level,

proper adjustment of the gas (manifold) pressure is essen-

tial. See page 6 for further information on manifold pressure

adjustments.

The burners usedin this series ARENOT EQUIPPEDWITH

AIR SHUTTERS, as none are required. Proper operation

(flame characteristics) is obtained by insuring that the orifice

size, and manifold pressure are correct for the fuel being

used and the altitude of the installation.

Main Burner

Burner Face

10--10--78

Figure 8

8. LP PRESSURE SWITCH

Models converted to operate on LP Gas will be installed with

an LP Pressure Switch. If so equipped, the switch will be lo-

cated in the gas supply line (in a “Tee” fitting), just ahead of

the gas valve.

Thepurposeofthisswitchistopreventfurnaceoperatingun-

der low line (Supply) pressure conditions. Operating under

lowlinepressureconditions, cancreateproblemssuchasin-

complete combustion, flashback, sooting, etc.

The switch is a “Normally Open” pressure operated switch

that iswiredinseries withthefurnace(vent) pressureswitch.

The LP Pressure Switch closes when line (Supply) pressure

is 8.0²W.C. or higher. the LP Pressure Switch Opens if line

pressure falls below 6.0²+0.6²W.C. interrupting power to

the gas valve.

On some models, it is located (electrically) between the Fur-

nace (vent) pressure switch and the gas Valve.

Multi Position Furnace Service Manual

9441 08 2010 01

Typical LP Pressure Switch

Figure 9

9. HIGH ALTITUDE OPERATION

Thesefurnaces aredesignedto operateinthemajority ofthe

country without modifications. At altitudes over 2,000¢above

sea level, however, certain measures need to be taken to in-

sure continued, safe reliable operation. For example, units

mustbede--ratedforaltitude(byadjusting manifoldpressure

and/or changingorificesize) basedupon thetypeof fuel(I.E.

Natural Gas or LP gas), Btu content of the gas, and installed

altitude.

ALL UNITS must have a high altitude pressure switch

installed at altitudes above 4,000¢above sea level.

When servicing a unit installed at altitudes above 2,000¢in-

sure that it has been properly modified to operate at that alti-

tude. See the sections on Gas pressure (Page 9), and pres-

sureswitches(Page12) toobtain specificinformationforyou

particular installation altitude.

10. CHECKING TEMPERATURE RISE

Air Flow

Checking Temperature Rise

Figure 10

Thermometer:

Return Air Temp.

Thermometer;

Supply Air Temp.

Supply

Air Flow

Return

The furnace is designed to operate within a certain specified

range of temperature rise.

Operating the furnace outside the specified range may result

in lower efficiency and/or comfort levels, as well as prema-

ture combustion component failures.

Simplystated,thetemperaturerisethroughthefurnaceisthe

differenceintemperaturebetweenthereturnair,andthesup-

ply air.

NOTE: BEFORE CHECKING TEMPERATURE RISE BE

CERTAIN THAT MANIFOLD PRESSURE IS PROPERLY

ADJUSTED.

TYPICAL OPERATING TEMPERATURE RISE RANGE

Single--Stage

Model Range

50 Mbtu 35°F--65°F

75, 100 & 125 Mbtu 40°F--70°F

Two--Stage

Model Fire Range

HI 35°F--65°F

50 Mbtu LOW 35°F--65°F

HI 40°F--70°F

75 Mbtu, 100 Mbtu & 125 Mbtu LOW 40°F--70°F

For specific temperature rise check pages 30 thru 36 of this

manual.

Always check current “Technical Support Manual”

Operate the furnace for 15 minutes before taking tempera-

ture readings. Subtract the return air temperature from the

supply air temperature. The result is the temperature rise.

Compare with the allowable rise listed for the model (size)

you are checking.

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

Temperature Rise can bechecked by placing athermometer

inthe returnair duct within6¢offurnace.Placeasecondther-

mometer in the supply duct at lease two (2) ft. away from the

furnace. (This willprevent any false readings caused by radi-

ation from the furnace heat exchanger) Make sure that the

FILTER IS CLEAN and that ALL REGISTERS AND/OR

DAMPERS ARE OPEN.

If the riseisnot withinthespecifiedrange, itwillbenecessary

to change the heating blower speed. Iftheriseistoohigh,

itwillbenecessarytoincreasetheblowerspeed.Iftherise

istoo low,itwillbenecessarytoreducetheblowerspeed.

Example: Supply Temp. 170°

Return Temp. 70°

Temperature Rise 100°= Too High

Solution: Increase Blower Speed

11. ROOM THERMOSTATS

Room thermostats are available from several different

manufacturesin awidevariety ofstyles. Theyrangefromthe

very simpleandinexpensiveBi--metallic typetothecomplex.

They are simply a switch (or series of switches) designed to

turn equipment (or components) “ON” or “OFF” at the de-

sired conditions.

An improperly operating, or poorly located room thermostat

can be the source of perceived equipment problems. A care-

ful check of the thermostat and wiring must be made then to

insure that it is not the source of problems.

Thermostat Location

Figure 11

5 ft.

DRAFTS

SUN

THERMOSTAT

LIGHT

SHIELD

LOCATION

The thermostat should not be mounted where it may be af-

fected by drafts, discharge air from registers (hot or cold), or

heat radiated from the sun of appliances. Never install in al-

coves, bathrooms or bedrooms.

The thermostat should be located about 5 ft. above the floor

in an area of average temperature, with good air circulation.

Normally, an area in close proximity to the return air grille is

the best choice.

Mercurybulbtypethermostats MUSTbeleveltocontroltem-

perature accurately to the desired set--point. Electronic digi-

tal type thermostats SHOULD be level for aesthetics.

HEAT ANTICIPATORS

Heat anticipators are small resistance heaters built into most

electric--mechanicalthermostats.Theirpurposeis toprevent

wide swings in room temperature during furnace operation.

Inordertoaccomplishthis,theheat outputfromtheanticipa-

tor must be the same regardless of the current flowing

through it. Consequently, most thermostats have an adjust-

ment to compensate for varying current draw in the thermo-

stat circuit.

Thepropersettingof heat anticipators then isimportanttoin-

sure proper temperature control and customer satisfaction.

Measuring Current Draw

Figure 12

Ammeter

Subbase

Amps

The best method to obtain the required setting for the heat

anticipator, is to measure the actual current draw in the con-

trol circuit (“W”) using a low range (0--2.0 Amps) Ammeter.

(SeeFigure 12)Aftermeasuringthecurrentdraw,simplyset

the heat anticipator to match that value.

If a low range ammeter is not available, a “Clamp--on” type

meter may be used as follows:

1. Wrap EXACTLY ten (10) turns of wire around the jaws

of a clamp--on type ammeter.

2. Connect one end of the wire to the “W” terminal of the

thermostat sub--base,andtheothertothe“R”terminal.

3. Turn power on, and wait approximately 1 minute, then

read meter.

4. Divide meter reading by10 to obtain correct anticipator

setting.

NOTE: For 2 Stage heating thermostats the above proce-

dure MUST be performed twice. Once for first

stage (W1), and once for second stage (W2), if

both stages have adjustable heat anticipators.

If anammeter isnot available, asettingof 0.30 amps maybe

used for models equipped with the HONEYWELL SV9541M

Gas Valve/Ignition Control. They should, however, provide

satisfactory operation in most cases.

Electronic thermostats do not use aresistance type anticipa-

tor. These thermostats use a microprocessor (computer)

that determines a cycle rate based on aprogram loaded into

it at the factory.

Multi Position Furnace Service Manual

11 441 08 2010 01

These cycle rates are normally field adjustable for different

types to equipment. The method of adjustment, however,

varies from one thermostat manufacturer to another. Check

with the thermostat manufacturer to find out the proper way

of adjusting the cycle rate.

12. CONTROL WIRING

Control wiring is an important part of the total equipment

installation, since it provides the vital communications link

between the thermostat, and the equipment malfunctions.

Controlwiringthatiseithertoolong,undersized,orimproper-

ly connected (be it simply loose, or on the wrong terminal)

can in fact be the source of many equipment problems.

ALWAYS check to make sure that the control wiring is con-

nected to the proper terminal(s) of the equipment and ther-

mostat you are using. Remember, also, that the thermostat

terminals are not always identified alike by different thermo-

statmanufacturers. Connections MUST becleanandtightto

insure trouble--free operation.

For years, installers have run a wire from the “Y” terminal of

the room thermostat and connected it directly to the contact

on coil of a condensing unit. (not making any connection to

the furnace with this wiring. Then, run the low voltage “Com-

mon” wire from the condensing unit back to the “C” terminal

of the furnace.

With the HONEYWELL ST9160B electronic Fan Timer/Fur-

nace Control, the “Y” terminal of the furnace does in fact

serve a particular purpose. Failure to connect it will result in

certain improper operation as follows:

The COOLING fan speed is energized via the “Y” terminal.

Failure to connect the thermostat “Y” terminal to the “Y” ter-

minal on the control will result in the failure to energize the

COOLING speed on a call for cooling from the thermostat.

(The HEATING speed will be energized instead via the “G”

terminal)

13. TWINNING KITS

Some installations may require a Heating capacity or Airflow

capabilities greater than a single furnace of this series can

provide.. When this is necessary, furnaces may be installed

in a “Twinned” configuration.

The Twinning Kit allows the two (2) furnaces to be controlled

bythesameroomthermostat.WhenTwinned, thecirculating

(conditioned air) blowers of BOTH furnaces will operate si-

multaneously.

Models equipped with a HONEYWELL ST9160B series Fan

Timer/Furnace Control may be twinned using a model

NAHA003WK01 twinning kit.

To assist troubleshooting efforts of “Twinned” installations,

“TYPICAL” control wiring diagrams are provided on pages **

through **.

14. LIMIT SWITCHES

Two (2) different kinds of limit switches are used on this se-

ries of furnaces. They are the main limit and roll out limit

switches. The main limit, and roll limit switches are used on

all models.

NOTE:Alllimitswitchesaresafetydevicesandotherthan

for testing purposes, should never be jumped out! Limit

switches are “normally closed” electrical switches, designed

to open when their predetermined “limit setting” has been

reached.

It should also be remembered, that when a limit switch

opens, it more than likely is not due to a bad switch! The

cause of the opening limit must be found and corrected, be-

fore the furnace can resume proper operation.

FIRE HAZARD.

Failure to do so can result in death, personal injury

and/or property damage.

Limit controls are factory preset and MUST NOT be

adjusted. Use ONLY manufacturer’s authorized

replacement parts.

Thespecificfunctionsofthetwo(2)limit switchesusedinthis

series of furnaces are as follows:

MAIN LIMIT SWITCH

A “Normally Closed” switch located on the front partition of

the furnace. It monitors supply air temperature, and inter-

rupts furnace (burner) operation when a supply air tempera-

ture is sensed which would result in the furnace exceeding

Maximum allowable outlet air temperature. While the main

limit is open, combustion blower, and/or the circulating blow-

erwillbeenergizedcontinuously.Thiscontrolisan“Automat-

ic” reset control, which will reset itself when the temperature

sensed drops to a safe level.

If furnace (burner) cycles on this limit switch, (I.E. switch

opens and closes during furnace operation) it is more than

likely due to a high temperature rise through the furnace.

(See checking temperature on page 8 of this manual)

High temperature rise can be caused by either OVER

FIRING (high manifold pressure. incorrect orifices, etc.) or

LOW AIRFLOW (dirty filter,blowerspeedtoolow,excessive

static in duct system, etc.)

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441 08 2010 01

Typical Limit Switch

Figure 13

Toverifythis, thecut--out(opening)point oftheswitchshould

be checked (using a thermocouple type thermometer con-

nected to the face of the switch) as follows:

1. Operate furnace for several minutes.

2. Block return air grille(s) to furnace.

3. Observe temperature at which switch opens (burner

operation ceases).

4. Remove blockage from return grille(s).

5. Observe temperature at which switch closes (burner

operation resumes).

6. Compare readings with the limit setting listed in the

appropriate chart for the model you are servicing.

Ifswitchisopeningwithinthespecifiedrange,thenitissimply

doing its job,and thecause of the over--temperature must be

determined and corrected.

If, however, the switch is found to be opening prematurely,

then it should be replaced. When replacing ANY limit switch,

use ONLY a switch of EXACTLY the same temperature set-

ting. Use of a different temperature limit switch can create a

dangerous situation. Someof the main limitswitches usedin

this series are SIMILAR IN APPEARANCE. DIFFERENT

TEMPERATURE SETTINGS, HOWEVER, ARE USED for

different models. Be certain you have the correct control for

the model you are servicing.

ROLL OUT LIMIT

A “Normally Closed” switch (wired in series with the Main

Limit switch) mounted on the burner box.

This switch may be of the manual type, depending upon the

particular model and/or family. Different temperature

(OPENING) settings are also used on different models.

When replacing this switch, be absolutely certain the correct

one is used.

Typical Roll Out Limit Switch

Figure 14

CAUTION

NEVER use an automatic reset roll out switch to replace

a manual reset type roll out switch.

Doing so may cause potentially unsafe and/or intermit-

tent operation.

The roll out switch monitors the temperature inside the burn-

er box, and interrupts furnace (burner) operation when its

temperature indicates flame roll out has occurred.

If the roll out switch has opened, the cause must be deter-

mined. Some possible reasons for flame roll out include are-

stricted primary or secondary heat exchanger or over fired

furnace.

MANUAL RESET SWITCH MODELS

Furnace models which are equipped with a Honeywell

ST9160 Fantimer/furnace controluseamanualresetrollout

switch.Oncetherolloutswitchhasopened,burneroperation

will be prevented until the roll out switch is “Manually Reset”

by pressing the red button located on the switch. While the

rolloutswitchisopen,(Dependingupontheparticularmodel)

the combustion blower and/or circulating blower will beener-

gized continuously.

AUXILIARY LIMIT SWITCHES

Allmodelsareequippedwithone(1)additional(AUXILIARY)

limit switch mounted on the blower deck. Its purpose is to

monitor return air temperature, and interrupt burner opera-

tion when a temperature is sensed which could result in the

filter surface(s) exceeding allowable temperatures. Depend-

ing uponthe particular model, the combustion blower, and/or

circulating blower may be energized continuously while the

auxiliary limit switch remains open.

This control is an “Automatic” reset control which will reset

itself when the temperature drops to a safe level. See the

Tech. Service Data Sheet for the model you are servicing, to

obtain its specific auxiliary limit switch setting.

15. PRESSURE SWITCHES

Blower Pressure Switch

An air proving switch (pressure switch) is used on all models

to insure that a draft has been established through the heat

exchanger before allowing burner operation.

To insure continued SAFE, RELIABLE, operation, NEVER

SUBSTITUTEapressureswitchwithonethatissimilarinap-

pearance. ONLY FACTORY PROVIDED or

AUTHORIZED SUBSTITUTES ARE ACCEPTABLE.

All models installed at altitudes of 4,000¢above sea level or

higher require replacing the standard pressure switch with a

high altitude pressure switch. The different pressure switch

Multi Position Furnace Service Manual

13 441 08 2010 01

settings allow continued SAFE, RELIABLE, high altitude

operation.

Pressure Switches

Figure 15

10--13--04a

Under normal operating conditions, sufficient negative pres-

sure will be created to close the pressure switch, and keep

it closed to keep furnace operating. Under abnormal condi-

tions,however,suchasarestrictedvent pipe,oraleakinone

of the heat exchangers, sufficient negative pressure will not

be created. This will result in the switch failing to close or fail-

ing to remain closed during furnace operation.

When servicing a unit whose pressure switch will not close,

or remain closed during operation, the operating pressure of

that furnace should be checked and compared to

approximate operating pressures listed in Table 4 and the

switch setting(s) listed above for the model family you are

servicing.

It is important to remember, that greater negative pressures

are created by the furnace when “HOT” (I.E. upon initial

start--up) than when “COLD” (I.E. after furnaces has beenin

operation for a few minutes). Because of this, furnace pres-

sure should ONLY be checked when “HOT” to insure accu-

rate readings.

Table 4 lists approximate operating pressures. They are in-

cluded in this manual to provide you with a “Barometer” to

gauge our pressures against. The pressures you obtain in

the field willdiffer slightly from these figures based uponvent

length, gas pressure, operating temperature, etc.

Major discrepancies in pressures, will normally cause

problems with pressure switch operation. These Major dis-

crepancies should be investigated as follows:

Table 4 APPROXIMATE OPERATING

PRESSURES (²

²²

²OF W.C.)

Model Vent Length

Single Stage Close --0.69

ALL Models Open --0.59

Hi Fire (Close) --0.60

2--Stage & Variable

Hi Fire (Open) --0.59

peed

ALL Models Lo Fire (Close) --0.40

Lo Fire (Open) --0.30

Lower (Lesser) Negative Pressures

Lower than normal negative pressures measured at the

Combustion Blower may be caused by:

1. Restriction on the Outlet side of the combustion blow-

er. (I.E. Blocked Flue, Vent too long, Heat Exchanger

leak, etc.)

2. Leak (lack of restriction) on the Inlet side of the com-

bustion blower.

Higher (Greater) Negative Pressures

Higher than normal negative pressures measured at the

Combustion Blower may be caused by:

1. Restriction on the Inlet side of the combustion blower.

(I.E.PluggedHeatExchanger,airinletorificetoosmall)

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Service Manual

441 08 2010 01

Figure 16 Typical Vent/Combustion Air Piping Installation

Furnace

Minimum One Inlet and One Outlet Air Supply is Required

Maybe in and Combination Shown

Inlet Air Opening Must be Within12²(300mm) of floor

Outlet Air Opening Must beWithin12²(300mm) of ceiling

(1) 1 Square Inch (6cm2) per 4000 BTUH

(2) 1 Square Inch (6cm2) per 2000 BTUH

This installation NOT approved in Canada

Gas Vent

Gable Vent Gable Vent

Outlet

Air (1)

Outlet Air (1)

Furnace

Outlet

Air (2)

Optional Inlet Air (1)

Ventilated Attic Ventilated Attic

Ventilated Crawl Space

Inlet

Air (1) Inlet

Air (1)

Inlet

Air (2) Inlet

Air (2)

Top Above Insulation

Soffit Vent

16. HONEYWELL ST9160B Series FAN TIMER/FURNACE CONTROL

Figure 17 Honeywell ST9160B

Dip

Switch

2 5 -- 2 3 -- 6 3

FUSE

The Honeywell ST9160B Electronic Fan Timer/Furnace

Control contains NO USER SERVICEABLE COM-

PONENTS. It is, as its name implies, a fan timer and a fur-

nace control of sorts. In addition to controlling the fan opera-

tion for heating, italso takes theplace of theblower relay, the

combustion air relay and/or the system relay.

TheST9160B isusedinmodelsequipped withtheSV9541M

GAS VALVE/IGNITION CONTROL. It provides the power

source to begin the ignition sequence through a monitored

safety circuit. It also serves as a low voltage terminal strip.

Accessory terminals forconnectingaHumidifierand/orElec-

tronic Air cleaner are also provided, as well as a Continuous

fan terminal which allows for continuous fan operation at a

speed other than either the heating or cooling speed.

The control provides a fixed (non--adjustable) 60 second

“ON” and 60 second “OFF” delay for the circulating blower in

COOLING and a 30 second “ON” delay for the circulating

blower in HEATING.

The ST9160B control also provides an adjustable HEATING

“OFF” delay for the circulating blower which can be field ad-

justed to 60, 100, 140, or 180 seconds.

25--23--47

Figure 18 Heating “OFF” Delay DIP switch

Setting

COOL ON DELAY: 6 SEC.

COOL OFF DELAY: 60 SEC.

HEAT ON DELAY: 30 SEC.

Setting “OFF” and “ON”

Setting the ST9160B Heating Fan “OFF” Delay is accom-

plished by the positioning of “DIP” switches. The label on the

back of the furnace door indicates how to position these

switches to obtain the desired setting. (See Figure 18)

Multi Position Furnace Service Manual

15 441 08 2010 01

The ST9160B Heating “OFF” delay can be set to (60. 100,

140,or180). Thecontrolwasshippedoutinthe140position.

This may be satisfactory for some installations, but not for

others.

TheHeating “ON” delay isfixedat 30seconds is notad-

justable.

The “OFF” delay should be set as long as possible without

creating “COLD AIR” complaints at the end of the cycle.

Troubleshooting

The operation of the HONEYWELL ST9160B series FAN

TIMER/FURNACE CONTROL (as well as the operation of

thefurnaceingeneral)canbeverifiedinafewminutesbyus-

ing two (2) jumper wires (to jumper terminals of the low volt-

age terminal strip) and the “TEST SEQUENCE” below.

17. ST9160B TESTING SEQUENCE

If furnace successfully passes this testing sequence, it can

be assumed that there are no problems with the ST9160B

FAN TIMER/FURNACE CONTROL. If it does not, however,

itdoesnot necessarilymeanthatthere areproblemswiththe

control. Any malfunctions should be thoroughly investigated

before replacing and components.

CHECKING COOLING FUNCTIONS

1. JUMPER “Y” & “G” TO “R”

2. CHECK COOLING FAN DELAY “ON”

3. CHECK COOLING SPEED FAN OPERATION

4. REMOVE JUMPER

5. CHECK COOLING FAN “OFF” DELAY

CHECKING HEATING FUNCTIONS

1. JUMPER “W” TO “R”

2. CHECK COMBUSTION BLOWER START--UP

3. CHECK IGNITION SYSTEM ACTIVATION

4. WHEN MAIN BURNER LIGHTS, CHECK HEATING

FAN “ON” DELAY

5. CHECK HEATING SPEED FAN OPERATION

6. REMOVE JUMPER

7. CHECK POST PURGE DELAY

8. CHECK HEATING FAN “OFF” DELAY

18. ST9160B - UNIQUE CONTROL FUNCTIONS/RESPONSES

There are some unique responses from these controls that

differ from what one would normally expect, and may be

somewhat confusing. (See Figure 17) Specifically, these

are as follows:

Energizingthe“G”terminalof thiscontrolwillcausetheblow-

er to run on the HEATING speed. (With most other furnaces,

the blower relay is energized via the “G” terminal normally

causing the blower to run on the cooling speed.)

Energizing the “G” & “Y” terminals (together) will cause the

blowertorunontheCOOLING speed.It isimportantthatyou

take note of this, since control wiring improperly connected

can cause perceived as well as real equipment problems.

For example, in the past, the “Y” terminal in nearly all fur-

naces was simply a binding post. There was no electrical

connection between this terminal and the rest of the furnace.

Consequently, many installers would not use this terminal to

connect the “Y” signal from the thermostat, but would run it

directly from the thermostat to the condensing unit, the run

the “Common” signal back to the furnace “C” terminal.

This method of wiring will result in improper operation from

this control. The control MUST receive a “Y” signal in order

for it to energize the “COOL” terminal, bringing on the blower

in the cooling speed. If it is wired as above, the condensing

unit will come on, but the blower will run on the HEATING

speed.

“NO TERMINALS” ENERGIZED (on low voltage terminal

strip) -- If a speed tap wire has been connected to the

“CONT.” (continuous) terminal, (operational terminal pro-

vided on the ST9160B series controls) the blower will run on

thisspeed.Maximumallowableconnectedloadforthistermi-

nal is 8.0 FLA.

The “CONTINUOUS” terminal of the ST9160B control is en-

ergized ONLY when there is NO OTHER CALL FOR OP-

ERATION of any kind. If there is a call for HEAT, COOL, or

“FANON”, this terminal is DE--ENERGIZED. The purpose of

this terminal is to provide a means of air circulation during

“OFF CYCLES” at a different speed than either heating or

cooling. Theuseof thisterminal isoperational,andthere

will be no speed tap wires connected to this terminal

when the furnace is shipped.

“CONTINUOUS” fan should not be confused with “FAN ON”

which is obtained by switching the fan selector switch on the

thermostatsub--baseto“FAN ON”,(energizingthe“G”termi-

nal) which causes the blower to run on the “HEATING”

speed.

The ST9160B Electronic Air Cleaner terminal (EAC)IS

ONLY energized in conjunction with the HEATING and

COOLING speedterminals. Themaximumallowablecon-

nected load to the HUM terminal is 0.8 (eight tenths)

Amp.*

*The combined connected loads of the EAC and HUM termi-

nals cannot exceed a total of 0.8 (eight tenths) amp.

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441 08 2010 01

19. HONEYWELL SV9541M GAS VALVE/IGNITION CONTROL

dwg 25--23--31a

Figure 19 Honeywell ST9541M Ignition System

Gas Valve/Ignition Control

Ignition/Sensor

Pilot Burner/Sensor

The system consists basically of only two (2) components.

The Ignition System Control and the Pilot Hardware. The op-

erate on Two (2) 24 volt power circuits received from the

ST9160B Fan Timer/Furnace Control. One isthe power sup-

ply to the ignitor, the second is to activate the ignition se-

quence.

TheIgnition System Control managestheignitionsequence,

and the flow of gas to the pilot and main burners. It is in es-

sence a combination Gas Valve and Ignition control.

It contains sophisticated electronic components (internally)

and has NO USER SERVICEABLE COMPONENTS.

Should a problem be verified internally within the device, IT

IS NOT REPAIRABLE, and must be replaced.

The Pilot Hardware includes the pilot burner, the hot surface

element that lights the pilot burner,the flame rod that senses

pilot flame,andthecablethatattachestothesystemcontrol.

Thehotsurfaceelement is madeof tough breakresistant ce-

ramic composite material. It operates on 24 Volts A.C. The

Igniter/Flame Rod assembly can be replaced independently

from the pilot burner assembly.

The system operation is quite simple, and forgiving (I.E. nui-

sance lockouts are eliminated)

20. HONEYWELL SV9541M SYSTEM OPERATION

Connecting the furnace to the line voltage supply with the

blower door interlock switch closed provides 24 volts to pow-

erthesystem.(Thisisaccomplishedbytheconnectionsfrom

terminals [pins] #4& #2from theST9160B fantimer totermi-

nals #1 & #3 of the SV9541M gas valve.)

When the thermostat calls for heat, (the combustion blower

starts, causing the pressure switch to close completing the

circuit to the ignition system control) there will be approxi-

mately atwo (2) second delay, while theignition systemcon-

trol runs a self check.

Part of the self check is to see if a flame signal is detected.

If aflamesignalis detectedupon acallforheat (andnaturally

there shouldn’t be), the ignition system control will energize

the electronic fan timer output (causing the conditioned air

blower to start after the fixed 60 second “ON” delay) and will

keep the valve and ignitor to circuit off.

Assuming that no flame signal is detected upon the call for

heat,(Normaloperation),theignitionsystemcontrolwillpow-

er the ignitor circuit (24 volts) causing the ignitor to heat up.

If the ignitor circuit is not proven (I.E. the ignitor is missing,

broken, or the connections are loose) their will be no re-

sponse from the ignition system control. (Lockout)

Once the ignitor circuit has been proven, and the ignitor be-

gins to heat up, thepilot valve will beenergized allowing gas

to flow to the pilot burner.

With the ignitor nowhot, andgas flowing to the pilot , the pilot

should light, and the sensor should sense flame.

Ifnoflameissensed,(I.E.nogas,pilotnotlit,flamenotenvel-

oping sensor, etc.) the ignitor will stay on, and the pilot valve

will remain open until it does sense flame, or until the call for

heat is satisfied. THE SYSTEM WILL NOT LOCK OUT un-

der this condition.

Assuming that the pilot does light, and flameis sensed, (nor-

mal operation) the ignition system control will turn the ignitor

off, while energizing the main valve. This will allow the pilot

to light the mainburner. It willalso energize the electronic fan

timer output (causing the conditioned air blower to start after

the fixed 60 second “ON” delay).

If a flame outage (I.E. loss of gas supply, blown out, etc.)

should occur during a run cycle (Main burner operation), the

ignition system immediately de--energize themain valve and

re--power the ignitor circuit placing the system back in to the

“Trial For Ignition” mode.

As previously, it will remain in this “Trial For Ignition” mode

(Ignitor powered and pilot valve open) either until the pilot

lights and flame is sensed, or until the call for heat ends.

TheSV9541Msystemis not sensitive tofurnacegrounding

or line voltage polarity. Accordingly, you cannot experience

a lockout due to those reasons.

Assuming that the main burner did not experience any prob-

lems during the run cycle (normal operation) it would contin-

ue to operate as long as the call for heat remained.

Once the call for heat ended, the ignition system control

would immediately close the main and pilot valves, and de--

energize the electronic fan timer output.

De--energizing the electronic fan timer output causes the

“OFF” delay timing tobegin, and whenthe pre--selected time

(90, 100, 140, or 180 seconds) expires, the blower will turn

off.

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17 441 08 2010 01

TROUBLESHOOTING

Malfunctions of the HONEYWELL SV9541M “Smart Pilot”

system may be easily diagnosed using a voltmeter and a

spare igniter/flame rod assembly.

The igniter itself can also be checked using an Ohmmeter.

Resistance of a “Good” igniter should be 10 Ohms or less.

See trouble shooting flow chart and the sequence of opera-

tionflowchart onpages 36and37of thismanualforaddition-

al information on the operation and troubleshooting of this

system.

21. CHECKING FLAME CURRENT

The Honeywell SV9541Q Ignition system used in this furnace

series proves (verifies) flame via the Flame Rectification

method.

Flame Rectification is a process of converting Alternating

Current (A.C.) into Direct Current (D.C.) During the ignition

sequence, an alternating current (A.C.) Voltage is applied to

the Flame probe.

When the burner lights the flame conducts an electrical cur-

rent between the flame probe and the burner ground. Due to

thedifferenceinsizebetweentheflameprobeandtheburner

ground area this current flows mostly in one direction. This

creates a pulsating Direct Current that flows back to the igni-

tion control proving flame.

This flame current (D.C. Microamps) may be checked (while

flame is present) using a D.C. Flame Sensor kit is available

from outside vendors.

Minimum Micro Amp Current is 0.2 micro amps.

22. CAPACITORS

Figure 20 Checking Capacitor

100 m¦

Microfarads

5mp

10 m¦

1000

m¦

10000 m¦

Capacitors are used for both the circulating (conditioned air)

blower motor and the exhaust (combustion) blower. Before

replacingoneofthesemotors(assumedtobebad)thecondi-

tion of its capacitor should be verified, since it, and not the

motor, may be the source of the problem.

Before checking any capacitor, the supply power to the unit

should be turned “OFF”. The capacitor should then be dis-

charged (through a resistor) before testing. A 20,000 Ohm 2

Watt resistor can be used for this purpose.

The condition of the capacitor should then be verified with a

capacitor analyzer (one that indicated the capacitor’s value

in microfarads) rather than with an Ohmmeter. The reason

forthis,isthatanOhmmetertestcanonly indicateif acapaci-

tor is “OPEN’, or “SHORTED”, it cannot verify if its value(mi-

crofarads) is within an acceptable range.

Capacitorshouldtesttowithin10%ofitsratedvalue.Capaci-

torstestingoutsidethisrangeshouldbereplaced.Aweakca-

pacitor can be the cause of a motor failing to start.

23. BLOWER ASSEMBLY

All modelsuse amulti--speed, permanent split capacitor mo-

tor,direct--drive,blowerassembly.Differentsize(HP)motors

and/or different diameter blower wheels are used in each

model to obtain the required air flow. The entire blower as-

sembly slidesoutonrailsforservicingafter removing thetwo

screws at the front.

SELECTING BLOWER SPEEDS

The wide variety of applications and installations of furnaces

throughout the country makes it impossible to “Factory Se-

lect” blower speeds that will provide proper operation for all

installations. This means then, that the blower speeds for

both heating and cooling must be “Field Selected” for each

particularinstallationtoinsureproper operation. istoprevent

wide swings in room temperature during furnace operation.

The criteria for selecting the proper blower speeds IS NOT

“High for Cooling, Low for Heating”. Although that may be

how it works out SOMETIMES, it can (inmanycases) beex-

actly the opposite. (I.E. a Lower speed for Cooling, and a

Higher speed for Heating)

The PROPER CRITERIA FOR SELECTING BLOWER

SPEEDS is as follows:

HEATING

A blower speed must be selected that will provide proper

temperature rise through the furnace. (See “checking tem-

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

perature rise” found elsewhere in this manual), The required

CFM for a particular temperature rise can also be calculated

using the following formula:

Output BTU

Temp. Rise X 1.08 = CFM

EXAMPLE:usinga75Mbtufurnaceofthisserieswithanout-

put of 67,500 Btuh and a desired temperature rise of 50°F

(rangeof40--70°Fallowable)andameasuredexternalstatic

pressure of 0.2²W.C. with a dry coil.

67,500 or 67,500

50 X 1.08 54 = 1250 CFM

Checking the blower performance data for this model, (see

Figure 36) indicates that @ 0.2²W.C. E.S.P. medium--high

speed will deliver 1249 CFM. Accordingly, medium speed

should be used in this example for the HEATING speed.

COOLING

A blower speed must be selected that will provide proper air

flow (Nominal 400 CFM per ton) for the size (capacity) air

conditioning coil being used at the external static pressure of

the Duct system (installation). This requires CHECKING

THE EXTERNAL STATIC PRESSURE, then consulting the

BLOWERPERFORMANCEDATAtodeterminetherequired

speed tap.

EXAMPLE: A 24,000 BTU (2 TON) air conditioning system,

usingthesame75,000BTUfurnaceasinthepreviousexam-

ple. The external static pressure is measured and found to

be 0.4²W.C.

400 CFM (nominal) per TON required

400x2=800CFMrequired

Checking the blower performance data (see Figure 36) for

this modelindicates that @ 0.4²W.C. ESP low speed will de-

liver 788 CFM. Accordingly, low speed should beused in this

example for the COOLING speed.

Table 5 Blower Performance Data

75,0000 BTUH

Air Delivery in Cubic Feet per Minute (CFM)

(Furnace Rated @ 0.5²W.C. ESP)

TAP LOW MED L MED H HIGH

ure

.10 778 984 1263 1576

ress

.C.

.20 786 1003 1249 1532

ic Pr

fW.

.30 790 1003 1244 1489

Stat

hes

.40 788 1001 1215 1432

rnal

Inc

.50 781 982 1186 1371

Ext

.60 765 962 1146 1308

.70 743 923 1094 1229

SAMPLE ONLY

CHANGING BLOWER SPEED

The procedure for changing blower speeds (if needed) is

shoun in Table 6.

ELECTRICAL SHOCK HAZARD.

Failure to do so can result in death and/or personal

injury.

Turn OFF power to furnace before changing speed

taps.

Table 6 Blower Speed Chart

Wire Color Motor Speed

Black High

Orange* Med--High

Blue Medium

Red Low

*Med--High speed may not be provided on all models.

Multi Position Furnace Service Manual

19 441 08 2010 01

Figure 21 Honeywell ST9160B

Dip

Switch

25--23--63

FUSE

Heat

Cool

HONEYWELL ST9160B

HEATING SPEED

Should it be necessary to change blower speeds to obtain

proper temperature rise, simply take the appropriate speed

tap wire, and plug it on to the terminal marked “HEAT”.

COOLING SPEED

When the proper speed has been determined, simply plug it

on to the terminal of the control marked “COOL”.

“UNUSED” TERMINALS

There are two (2) terminals (marked “UNUSED MOTOR

LEADS” on the Honeywell ST9160B which has no internal

connection to the control. Their purpose is to provide a place

to connect. “UNUSED” speed tap wires to keep them out of

the way and prevent them from shorting out against the fur-

nace casing, or each other.

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

24. HEAT EXCHANGER REMOVAL/REPLACEMENT

“Exploded” Parts View -- Typical Four Position Furnaces

Figure 22

25--41--61

Primary Heat Exchanger

1. Turn ”OFF” electrical power and gas supply to furnace.

2. Disconnect vent pipe to furnace at flexible coupling.

3. Disconnect combustion air inlet pipe at top panel (if

needed).

4. Remove furnace top panel.

5. Disconnectgas pipingtofurnace atgasvalve. Note:Be-

fore performing next step, insure that the wiring dia-

gram is available and readable, or tag all wires first.

6. Disconnect tubing and wiring to pressure switch, limit

switches, and gas valve.

7. Remove screws securing burner box to front partition.

8. Remove combustion blower.

9. Remove machine screws securing transition assembly

to furnace partition.

10. Remove the collector box.

11. Remove machine screws securing secondary heat ex-

changer inlet flange to lower partition.

12. Remove screws around perimeter of both the upper

and lower partitions (leaving the screws across the

center of the two panels in place).

13. Primary Heat Exchanger can now be removed with

both upper and lower partitions attached.

14. Reverse procedure to reinstall, making sure that any

gasketsthathave beentornduringdisassembly arere-

placed with new ones.

15. After reassembly, turn the gas supply on, and check for

leaks. All leaks must be repaired immediately.

16. Perform an operational check of the furnace.

Multi Position Furnace Service Manual

21 441 08 2010 01

HONEYWELL SV9541M “SMART VALVE” Sequence of Operation

The following is the normal operating sequence for the control system.

Cooling (Y) Request:

24 VAC signals applied to Y & G terminals of EFT (electronic fan timer) control.

·Cool motor speed energized after 6 second Cool Fan On Delay time.

Y & G signals removed from EFT.

·Cool motor speed de--energized after 60 second Cool Fan Off Delay time.

Circulating Fan (G) Request:

24 VAC signals applied to G terminals of EFT control.

·Heat motor speed energized without delay.

G signal removed from EFT.

·Heat motor speed de--energized without delay.

Heating (W) Request:

24 VAC signals applied to W terminal of EFT control.

·Inducer motor turns on.

·The gas valve solenoid energizes.

·Followinga3secondprepurge delay, the pilot valve opens and the ignitor begins to warm up.

·After the pilot lights, the main burners energize and light.

·Timed from the openingof the maingas valve, the control willdelay 30seconds before switching the fan to Heat speed.

W signal removed from EFT.

·The gas valve de--energizes and the main burners go out.

·The inducer runs at its present speed for a 30 second postpurge period.

·Timed from the gas valve de--energizing, the Heat fan speed de--energizes after the selected Heat Fan Delay time

expires.

Heating Request with Gas Supply Line Shut Off:

24 VAC signals applied to W terminal of EFT control.

·Inducer motor turns on.

·The gas valve solenoid energizes.

·Followinga3secondprepurge delay, the pilot valve opens and the ignitor begins to warm up.

·The ignitor glows red--hot for 30 seconds, then turns off.

·The igniter stays off for 25 seconds, then begins to warm--up again.

·The igniter glows red--hot for 30 seconds, then turns off.

·The pilot valve closes 3 seconds after the igniter de--energizes.

·The inducer de--energizes 5 seconds after the pilot valve closes.

·The SmartValve proceeds to soft lockout and flashes error code 6.

·The control exits soft lockout after 5 minutes and begins

another ignition sequence.

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

HONEYWELL SV9541M “SMART VALVE” Sequence of Operation

POWER APPLIED TO APPLIANCE

THERMOSTAT CALLS FOR HEAT

COMBUSTION BLOWER ENERGIZED

PRESSURE SWITCHES CLOSED WITHIN

30 SECONDS? COMBUSTION BLOWER DE--ENERGIZED

PILOT VALVE OPENS:

IGNITOR POWERED (1) THREE SECOND FLAME

FAILURERECYCLE DELAY

3 SECOND PRE--PURGE

FIVE MINUTE WAIT PERIOD

PILOT LIGHTS AND FLAME IS SENSED

DURING 90 SECOND TRAIL FOR

IGNITION?

PILOT VALVE CLOSES;

PILOT IGNITOR OFF

MAIN VALVE OPENS,

HEATING FAN “ON” DELAY BEGINS

AFTER DELAY: CIRCULATING BLOWER

STARTS

FLAME SENSE LOST? CIRCULATING BLOWER OFF AFTER

DELAY

PILOT AND MAIN VALVE CLOSE

COMBUSTION AIRBLOWER OFF AFTER

POST PURGE

FLAME SENSE LOST MORE THAN FIVE

TIMESINTHISCALLFORHEAT?

THERMOSTAT CALL FOR HEAT ENDS

COMBUSTION BLOWER DE--ENERGIZED

AFTER 30 SECOND POST PURGE

PILOT AND MAIN VALVE CLOSE

CIRCULATING BLOWER OFF AFTER

DELAY

WAIT FOR NEXT CALL FOR HEAT

PRESSURE SWITCHES PROVED OPEN? NO

YES

WAIT FOR PRESSURE SWITCHES TO OPEN

(1) Ignitor “ON” for first 30 seconds oftrial forignition, then “OFF” for next 30 seconds.

Ifthe pilot hasnot lit,it turns back “ON” for the final 30 seconds.The pilot valve remains

energized during the entire 90 second trial for ignition.

NOTE: Ifmain limit string opens and takeslonger than 2 minutes to close,system goes

into 1 hour waitperiod (indicating circulating blower).

YES

Multi Position Furnace Service Manual

23 441 08 2010 01

HONEYWELL SV9541 “SMART VALVE” Trouble shooting

The 6 + X designation indicates a combination of flash codes: 6

flashes shows the control is in soft lockout,followed by X flashes to indicate the reason the control went into soft lockout. Last status

code indicates repair to address first

LED

STATUS INDICATES CHECK/REPAIR

Off No power to system control.

LinevoltageinputatL1andNeutralconnectorsonST9160B

Fan Timer.

Low voltage (24V) powerat 24 VAC and COM terminals on

ST9160B

System wiring harness is in good condition and securely

connected.

Heartbeat

Bright –

Dim

Normal indication whenever the system is powered,

unless some abnormal event has occurred. NotApplicable -- NormalOperation(standbyorcallforheat)

2 Flashes

Pressure switches closed when it should be open

(i.e. when call for heat begins).

(Combustion bloweris notenergized untilpressure

switches opens)

Pressure switches stuck closed (system will wait for pres-

sure switch to open).

Pressure switches miswired or jumpered.

3 Flashes

Pressureswitches,openwhentheyshouldbeclosed

(i.e. longer than 30 seconds after combustion blower/

inducer is energized).

System goes into 5--minute delay period, with com-

bustion blower/inducer off. At end of the 5--minute

delay, another cycle will begin.

Ignition system control switch must be in the ON position.

Pressure switches operation, tubing, and wiring.

Restrictions in furnace air intake or vent piping.

4 Flashes

Main Limit or Roll Out Switch is open.

Combustion blowerisenergized,Circulating blower is

energized heat speed.

Main limit switch.

Manual reset burner rollout switch.

Limit and rollout switch wiring is in good condition and se-

curely connected.

Duct restriction/overfire.

5 Flashes Flame signal sensed out of proper sequence.

Combustion blowerisenergized,Circulating blower is

energized heat speed after the “ON” delay.

Flame at pilot burner.

6 Flashes

1Flash

Soft Lockout.

Failed to light pilot during 90 sec. trial for ignition

Combustion air blower is de--energized, Circulating

blower is de--energized after the “OFF” delay.

After 5--minute delay time, control system will reset

and initiate a new ignition sequence,

Gas supply off or pressure too low or high for appliance to

operate.

Damaged or broken HIS element

Flame sense rod contaminated or in incorrect position.

Pilot burner located in incorrect position.

Pilotburnerleadwiresareingoodconditionandpoperycon-

nected.

Pressure switches operation, tubing, and wiring.

6 Flashes

2 Flashes

Soft Lockout.

Last failure was Flame Sense lost during run.

Maximum recycle count exceeded

Combustion air blower is de--energized, Circulating

blower is de--energized after the “OFF” delay.

After 5--minute delay time, control system will reset

and initiate a new ignition sequence,

Gas supply off or pressure too low or high for appliance to

operate.

Flame sense rod contaminated or in incorrect position.

Pilot burner located in incorrect position.

Pilot burner lead wires are in good condition and properly

connected.

Cycling, pressure switch

Pressure switches operation, tubing, and wiring.

Single Stage Multi Position Furnace

Service Manual

441 08 2010 01

HONEYWELL SV9541 “SMART VALVE” Trouble shooting continued

LED

STATUS INDICATES CHECK/REPAIR

6 Flashes

3 Flashes

Soft Lockout.

Last failure was pressure switch

Maximum recycle count exceeded

Combustion air blower is de--energized, Circulating

blower is de--energized after the “OFF” delay.

After 5--minute delay time, control system will reset

and initiate a new ignition sequence,

Ignition system control switch must be in the ON position.

Pressure switches operation, tubing, and wiring.

High winds blowing against vent.

6 Flashes

4 Flashes

Soft Lockout.

Last failure was limit circuit opened during run.

Combustion air blower is de--energized, Circulating

blower is de--energized after the “OFF” delay.

After 5--minute delay time, control system will reset

and initiate a new ignition sequence,

Main limit switch.

Limit and rollout switch wiring is in good condition and se-

curely

connected.

Restriction in duct work.

Dirty filter

Overfire

7 Flashes

Soft Lockout.

Blower failure (typical)

Limit trip took longer than 2 minutes to reset.

System will start a new ignition sequenceafter1 hour,

if call for heat still present.

Dead blower.

Blocked duct work.

Multi Position Furnace Service Manual

25 441 08 2010 01

SV9541M ELECTRICAL VARIATION

SINGLE STAGE

Connector (Pin #) Description Voltage Signal When Signal is Present

Neutrals

(5--1/4²QC’s) Neutral 0VAC

(Neutral and earth ground should

be at the same potential)

Always present

(2--1/4²QC’s) Line Voltage 115 VAC Present when blower door interlock switch is closed.

HEAT

(1/4²QC’s) Fan power *115 VAC Present when Heat fan speed is on (Open Limit mode)

COOL

(1/4²QC’s) Fan power *115 VAC Present when Cool fan speed is on (Cool (Y) mode).

EAC

(1/4²QC’s) Electronic Air--

Cleaner power 115 VAC Present when High Heat or Cool fan speed is on.

CONSTANT FAN

(1/4²QC’s) Continuous Fan

power *115 VAC Present when other fan speeds is off.

HUM

(1/4²QC’s) Humidifier power 115 VAC Present when the Heat speeds is on.

P1 (pin 1) Line Voltage 115 VAC Present when the door interlock switch is closed.

P1 (pin 2) Data Line Non--periodic 1/2 wave rectified AC

(measures as an unstable AC volt-

age bouncing between 12 VAC and

16 VAC

Present when the door interlock switch is closed.

P1 (pin 3) C (xfmr common) 0VAC Always present

P1 (pin 4) Neutral 0VAC Always present

P1 (pin 5) 24 VAC 24 VAC Present when the door interlock switch is closed.

P1 (pin 6) R 24 VAC Present when the door interlock switch is closed.

C1 (pin 1) Limit return 1/2 wave rectified AC Present when the door interlock switch is closed. This

voltage decreases when a limit switch is open.

C1 (pin 2) Pressure Switch supply 1/2 wave rectified AC Present when the door interlock switch is closed. This

signal is the same as the C1 (pin 1)

C1 (pin 3) Pressure Switch return 1/2 wave rectified AC Present when the door interlock switch is closed. This

AC voltage decreases when the Low Pressure Switch

closes.

C1 (pin 4) Data Line Non--periodic 1/2 wave

rectified AC Present when the door interlock switch is closed. Same

signal as P1 (pin 5).

C1 (pin 5) Limit Supply 1/2 wave rectified AC Present when the 24 VAC transformer is powered.

C1 (pin 6) C (xfmr common) 0VAC Always present

C1 (pin 7) R24 VAC Present when the door interlock switch is closed.

C1 (pin 8) 24 VAC 24 VAC Present when the door interlock switch is closed.

C2 (pin 1) HSI return 24 VAC (with igniter present) Present when HSI is not turned on. When HSI is on, this

signal is 0 VAC to 10 VAC depending on input line volt-

age potential.

C2 (pin 2) HSI supply 24 VAC Present when the door interlock switch is closed.

C2 (pin 3) Not connected 0VAC Not connected

C2 (pin 4) Flame sense >80 VAC Present when the door interlock switch is closed.

C3 (pin 1) Inducer supply 115 VAC Present when the inducer draft blower motor is on (Heat

modes, Open Limit mode).

C3 (pin 2) L1 115 VAC Present when the door interlock switch is closed.

C3 (pin 3) Inducer return 0VAC Always present (neutral connection).

C3 (pin 4) L2 (neutral) 0VAC Always present

* With a motor tap connected, voltage appears at “unpowered” fan terminals whenever the motor is running due to feed-

back through the motor windings.

** Voltage appears on the “unpowered” inducer terminal whenever the inducer motor is running due to feedback through

the motor windings.

NOTE1: Using a Fluke 79 digital Multi--Meter (DMM), 1/2 wave rectified AC voltage typically measures about 14 VAC.

The Fluke 79 is not a “true” RMS meter.

Multi Position Furnace

Service Manual

441 08 2010 01

25. Wiring Diagram N8MPN/L, *8MPN/L & *8DNL

THERMOSTAT

MAIN LIMIT

GAS

VALVE

INDUCER

MOTOR

EAC

115V

ROLLOUT SWITCH

1 TO 3 IN SERIES

DEPENDING ON MODEL

TRANSFORMER

HUM

FAN CONTROL MODULE

TRANSFORMER

BLOWER

MOTOR

NEUTRAL

INDUCER

MOTOR

FURNACE

CONTROL

ROLLOUT SWITCH

1 TO 3 IN SERIES

DEPENDING ON

MODEL

CONT

COOL

EAC

HEAT

24V SECONDARY

DATA

5A FUSE

24V

24VAC

115V

60HZ

HEAT ON DELAY: 30 SEC.

1014484

DISCONNECT BEFORE SERVICING

WARNING: ELECTRICAL SHOCK HAZARD

CONNECTION DIAGRAM

COOL ON DELAY: 5 SEC

COOL OFF DELAY: 90 SEC

HEAT OFF DELAY

GAS VALVE

GND

COPPER

CONDUCTORS

ONLY

NEUTRAL

HOT

COM

VAC

FURNACE CONTROL

CAPACITOR

EAC

HUM

SEE MANUALS FOR ADJUSTING SPEED TAPS FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.

COLOR CODE

BLACK BK

BLUE BL

BROWN BR

GREEN G

ORANGE O

RED R

WHITE W

YELLOW Y

PURPLE P

SPEED TAP CODE

BLACK-HI BLUE-MLO

ORANGE-MHI RED-LO

LINE VOLTAGE FACTORY

LINE VOLTAGE FIELD

LOW VOLTAGE FACTORY

LOW VOLTAGE FIELD

INTERNAL CIRCUIT BOARD WIRING

5 A

FUSE

FACTORY

SETTING

BLOWER

MOTOR

LO (R)

M1 MLO (BL)

GND.

HEAT MHI (O)

COOL HI (BK)

LADDER DIAGRAM

INTERLOCK

SWITCH

HOT 115V-60HZ NEUTRAL

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE

MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE

AWM - 105°C WIRE OR ITS EQUIVALENT.

GAS

VALVE

LP PRESSURE

SWITCH

(LP MODELS ONLY)

INTERLOCK

SWITCH

MAIN LIMIT

FIELD

CONNECTION

BOX

LP PRESSURE

SWITCH

(LP MODELS ONLY)

1 2

HUM

115V PRIMARY

THERMOSTAT

60 SEC. 140 SEC. 180 SEC.

100 SEC.

COM

SENSOR

IGNITOR

PRESSURE SWITCH

1 TO 2 IN SERIES

DEPENDING ON

MODEL

PRESSURE SWITCH

1 TO 2 IN SERIES

DEPENDING ON MODEL

CAPACITOR

(SOME MODELS)

CAPACITOR

(SOME MODELS)

IGNITER

SENSOR

RECTIFIED AC VOLTAGE FACTORY

NOTE:

1. MOST VOLT METERS WILL READ 13-16 VOLTS

TO CHASSIS ON BOTH SIDES OF AN OPEN LIMIT

OR PRESSURE SWITCH IN THE RECTIFIED AC

VOLTAGE CIRCUIT

2. FACTORY CONNECTED WHEN BVSS,

(CHIMNEY ADAPTER ACCESSORY KIT) OR LP

PRESSURE SWITCH IS NOT INSTALLED.

CAPACITOR

BVSS

(FIELD INSTALLED)

NOTE 2

BVSS

(FIELD INSTALLED)

NOTE 2

Multi Position Furnace Service Manual

27 440 08 2010 01

Wiring Diagram (1/2HP DC Blower Motor)

12 12 12

2 STAGE

SINGLE STAGE

LIMIT

MAIN

THERMOSTAT

2 STAGE

INTERNAL CIRCUIT BOARD WIRING

LOW VOLTAGE FIELD

LOW VOLTAGE FACTORY

LINE VOLTAGE FIELD

LINE VOLTAGE FACTORY

HUM

EAC

24V

HUM

SETTING

FACTORY

60 SEC.

THERMOSTAT TYPE

100 SEC.

HOT 115V-60HZ NEUTRAL

WARNING: ELECTRICAL SHOCK HAZARD

DISCONNECT BEFORE SERVICING

GND.

SWITCH

INTERLOCK

CONNECTION DIAGRAM

SWITCH

INTERLOCK

BOX

CONNECTION

FIELD

HEAT ON DELAY: 30 SEC

COOL ON DELAY: 5 SEC

1014486

SEE MANUALS FOR ADJUSTING SWITCHES FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.

EAC

CAPACITOR

(SOME MODELS)

LADDER DIAGRAM

60HZ

115V

3344

SWITCH

PRESSURE

SWITCH

PRESSURE

LOW

VALVE

GAS

HOT

GND

NEUTRAL

THERMOSTAT

SINGLE STAGE

IND LOW

HEAT LOW

5A FUSE

YBK

24V SECONDARY

115V PRIMARY

FAN CONTROL MODULE

140 SEC. 180 SEC.

FURNACE CONTROL

SWITCH

PRESSURE

HIGH

GAS VALVE

SWITCH

PRESSURE

LOW

MAIN LIMIT

THERMOSTAT

2-STAGE

VALVE

GAS

SENSOR

IGNITER

2 STAGE

PBL

(LP MODELS ONLY)

SWITCH

LP PRESSURE

HEAT HI

IND HI

COOL

EAC

HUM

CONT

IND IN

W MOTOR

INDUCER

XFMR

TRANSFORMER

LINE

120 VAC

XFMR DC M

COM

NEUTRAL

VAC

(OPTIONAL)

HUMIDISTAT

TRANSFORMER

HIGH

INDH

MOTOR

INDUCER

INDIN INDL

234

115V

COM

24VAC

5 A FUSE

24VAC

IGNITER

SENSOR

2 STAGE

SHIE LD

BEAD

HIGH

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE

REPLACED, IT MUST BE REPLACED WITH TYPE AWM-105ºC WIRE OR EQUIV.

SHIE LD

BEAD

115V HOT

JUMPER, SURGE

115V NEUTRAL

JUMPER, 115V

DC MOTOR

CONTROL

*AIRFLOW

DIP SWITCHES

MOTOR

BLOWER

MOTOR

BLOWER

HEAT OFF DELAY SWITCH 3 NOT DEFINED OR

SWITCH 3 NOT USED

CAPACITOR

(SOME MODELS)

ROLLOUT SWITCH 1 TO 3 IN

SERIES DEPENDING ON MODEL

(HI VOLT FIELD)

COPPER

CONDUCTORS

ONLY

*AIRFLOW

DIP SWITCHES

DC MOTOR

CONTROL

JUMPER, 115V

115V NEUTRAL

JUMPER, SURGE

115V HOT

BLACK

BLUE

BROWN

GREEN

ORANGE

RED

WHITE

YELLOW

PURPLE

COLOR CODE

ROLLOUT SWITCH 1 TO 3 IN

SERIES DEPENDING ON MODEL

*AIRFLOW

DIP SWITCHES

DC MOTOR

CONTROL

JUMPER, 115V

115V NEUTRAL

JUMPER, SURGE

115V HOT

CIRCUIT BOARD

LP PRESSURE

SWITCH

(LP MODELS

ONLY)

EAC +HUM: 0.8 A MAX. COMBINED

2345678

12345678

2-STAGE

NOTE: 1. MOST VOLT METERS WILL READ 13-16 VOLTS TO

CHASSIS ON BOTH SIDES OF AN OPEN LIMIT OR PRESSURE

SWITCH IN THE RECTIFIED AC VOLTAGE CIRCUIT.

2. FACTORY CONNECTED WHEN BVSS, (CHIMNEY ADAPTOR

ACCESSORY KIT) OR LP PRESS. SWITCH, IS NOT INSTALLED.

RECTIFIED AC VOLTAGE FACTORY

BVSS

(FIELD INSTALLED)

NOTE 2

COOL OFF DELAY: 90 SEC

Multi Position Furnace

Service Manual

441 08 2010 01

Wiring Diagram (1 HP DC Blower Motor)

12 12 12

2 STAGE

SINGLE STAGE

LIMIT

MAIN

2-STAGE

2 STAGE

INTERNAL CIRCUIT BOARD WIRING

LOW VOLTAGE FIELD

LOW VOLTAGE FACTORY

LINE VOLTAGE FIELD

LINE VOLTAGE FACTORY

COLOR CODE

HUM

EAC

24V

HUM

SETTING

FACTORY

60 SEC.

100 SEC.

HOT 115V-60HZ NEUTRAL

WARNING: ELECTRICAL SHOCK HAZARD

DISCONNECT BEFORE SERVICING

GND.

SWITCH

INTERLOCK

CONNECTION DIAGRAM

SWITCH

INTERLOCK

BOX

CONNECTION

FIELD

COOL OFF DELAY: 90 SEC

COOL ON DELAY: 5 SEC

SEE MANUALS FOR ADJUSTING SWITCHES FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.

EAC

CAPACITOR

(SOME MODELS)

LADDER DIAGRAM

60HZ

115V

3344

SWITCH

PRESSURE

LOW

VALVE

GAS

HOT

GND

NEUTRAL

THERMOSTAT

SINGLE STAGE

IND LOW

HEAT LOW

5A FUSE

YBK

24V SECONDARY

115V PRIMARY

FAN CONTROL MODULE

140 SEC. 180 SEC.

FURNACE CONTROL

SWITCH

PRESSURE

HIGH

GAS VALVE R

SWITCH

PRESSURE

LOW

MAIN LIMIT

THERMOSTAT

2-STAGE

VALVE

GAS

SENSOR

IGNITER

2 STAGE

PBL

(LP MODELS ONLY)

SWITCH

LP PRESSURE

HEAT HI

IND HI

COOL

EAC

HUM

CONT

IND IN

W MOTOR

INDUCER

XFMR

TRANSFORMER

LINE

120 VAC

XFMR DC MTR

COM

NEUTRAL

VAC

(OPTIONAL)

HUMIDISTAT

1 2 3 4

TRANSFORMER

HIGH

INDH

MOTOR

INDUCER

INDIN INDL

115V

COM

24VAC

5 A FUSE

24VAC

IGNITER

SENSOR

2 STAGE

SHIELD

BEAD

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE

REPLACED, IT MUST BE REPLACED WITH TYPE AWM-105ºC WIRE OR EQUIV.

SHIELD

BEAD

115V HOT

JUMPER, SURGE

115V NEUTRAL

JUMPER, 115V

DC MOTOR

CONTROL

*AIRF LOW

DIP SWITCHES

THERMOSTAT TYPE

SWITCH 3 NOT USED

HEAT OFF DELAY

ROLLOUT SWITCH 1 TO 3

IN SERIES DEPENDING ON

MODEL

HIGH

PRESSURE

SWITCH

ROLLOUT SWITCH 1 TO 3

IN SERIES

DEPENDING ON MODEL

CAPACITOR

(SOME MODELS)

(HI VOLT FIELD)

COPPER

CONDUCTORS

ONLY

CIRCUIT BOARD

BLOWER

MOTOR

12345678

MOTOR

BLOWER

*AIRF LOW

DIP SWITCHES

DC MOTOR

CONTROL

JUMPER, 115V

115V NEUTR AL

JUMPER, SURGE

115V HOT

12345678

MOTOR

BLOWER

*AIRF LOW

DIP SWITCHES

DC MOTOR

CONTROL

JUMPER, 115V

115V NEUTRAL

JUMPER, SURGE

115V HOT

LP PRESSURE

SWITCH

(LP MODELS

ONLY)

BLACK

BLUE

BROWN

GREEN

ORANGE

RED

WHITE

YELLOW

PURPLE

EAC + HUM: 0.8 A MAX. COMBINED

THERMOSTAT

NOTE: 1. MOST VOLT METERS WILL READ 13-16 VOLTS TO

CHASSIS ON BOTH SIDES OF AN OPEN LIMIT OR PRESSURE

SWITCH IN THE RECTIFIED AC VOLTAGE CIRCUIT.

2. FACTORY CONNECTED WHEN BVSS, (CHIMNEY ADAPTOR

ACCESSORY KIT), OR LP PRESSURE SWITCH IS NOT INSTALLED.

RECTIFIED AC VOLTAGE FACTORY

BVSS

(FIELD INSTALLED)

NOTE 2

BVSS

(FIELD

INSTALLED)

NOTE 2

SWITCH 3 NOT DEFINED

HEAT ON DELAY: 30 SEC

1014487 REV. 2

Multi Position Furnace Service Manual

29 440 08 2010 01

Wiring Diagram *8MPT

1014485 REV. 2

2 STAGE

SENSOR

(SOME MODELS)

CAPACITOR

IGNITER

HUM

EAC

MOTOR

INDUCER

INDH

HIGH

HOT

NEUTRAL

ONLY

COPPER

GND

IGNITER

SENSOR

GAS VALVE

HEAT OFF DELAY THERMOSTAT TYPE

MAIN LIMIT

SETTING

FACTORY 60 SEC. 100 SEC.

SINGLE STAGE

12 12

2 STAGE

FAN CONTROL MODULE

43 4

THERMOSTAT

SINGLE STAGE

BL Y

4 5 6

1 3 2

TRANSFORMER

115V

XFMR

24V

24VAC

COM

CONNECTION DIAGRAM

DISCONNECT BEFORE SERVICING

WARNING: ELECTRICAL SHOCK HAZARD

SWITCH

INTERLOCK

COOL OFF DELAY: 90 SEC

COOL ON DELAY: 5 SEC EAC + HUM: 0.8 A MAX. COMBINED

BOX

CONNECTION

FIELD

VALVE

GAS

CIRCUIT BOARD

GND.

COOL HI (BK)

HEAT H MHI (O)

HEAT L MLO (BL)

M1 LO (R)

CONT (OPT)

SWITCH

PRESSURE

LOW

FURNACE CONTROL

DEPENDING ON MODEL

1 TO 3 IN SERIES

ROLLOUT SWITCH

MAIN LIMIT

SWITCH

HIGH PRESSURE

RCY

1 2 3 4

(HI VOLT FIELD)

THERMOSTAT

2-STAGE

60HZ

115V

5A FUSE

FUSE

5 A

SEE MANUALS FOR ADJUSTING SPEED TAPS FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.

INTERNAL CIRCUIT BOARD WIRING

LOW VOLTAGE FIELD

LOW VOLTAGE FACTORY

LINE VOLTAGE FIELD

LINE VOLTAGE FACTORY

ORANGE-MHI RED-LO

BLACK-HI BLUE-MLO

SPEED TAP CODE

HEAT LOW

IND LOW

PURPLE P

YELLOW Y

WHITE W

RED R

ORANGE O

GREEN G

BROWN BR

BLUE BL

BLACK BK

IND IN

IND HI

COLOR CODE

24V SECONDARY

115V PRIMARY

4343

180 SEC.140 SEC.

EAC

SERIES DEPENDING ON MODEL

ROLLOUT SWITCH 1 TO 3 IN

MOTOR

INDUCER

NEUTRAL

(SOME MODELS)

CAPACITOR

HEAT HI

COOL

HUM

CONT

SWITCH

PRESSURE

LOW

2 STAGE

(LP MODELS ONLY)

SWITCH

LP PRESSURE

2 STAGE

THERMOSTAT

VALVE

GAS

XFMR DC MTR

VAC

LINE

120 VAC

COM

MOTOR

BLOWER

PSC

(LP MODELS ONLY)

SWITCH

LP PRESSURE

CAPACITOR

MOTOR

BLOWER

PSC

AWM - 105°C WIRE OR ITS EQUIVALENT.

MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE

1234

HOT 115V-60HZ NEUTRAL

SWITCH

INTERLOCK

LADDER DIAGRAM

INDIN

HUM

EAC

INDL

CAPACITOR

NOTE:

1. MOST VOLT METERS WILL READ 13-16 VOLTS TO CHASSIS

ON BOTH SIDES OF AN OPEN LIMIT OR PRESSURE

SWITCH IN THE RECTIFIED AC VOLTAGE CIRCUIT

2. FACTORY CONNECTED WHEN BVSS, (CHIMNEY ADAPTOR

ACCESSORY KIT) OR LP PRESS. SWITCH IS NOT INSTALLED.

CONDUCTORS

RECTIFIED AC VOLTAGE FACTORY

BVSS,

(FIELD INSTALLED)

NOTE 2

BVSS

(FIELD INSTALLED)

NOTE 2

HEAT ON DELAY: 30 SEC

SWITCH 3 NOT DEFINED

OR SWITCH 3 NOT USED

SWITCH

PRESSURE

HIGH

Multi Position Furnace

Service Manual

441 08 2010 01

26. Model Specifications

Manufacturers Number (Mfr No -SeeRatingPlate)

ALL Models (N8MPN) Specifications

N8MPN

050B12 N8MPN

075B12 N8MPN

075F16 N8MPN

100F14 N8MPN

100F20 N8MPN

100J22 N8MPN

125J20 N8MPN

125J22

General

Input (Btuh)

Output (Btuh)

Temp. Rise (°F)

50,000

40,000

35--65

75,000

60,000

35--65

75,000

60,000

25--55

100,000

80,000

30--60

100,000

80,000

35--65

100,000

81,000

30--60

125,000

100,000

30--60

125,000

100,000

30--60

Electrical (Volts/Hz/FLA) 115/60/9.8 115/60/8.9 115/60/10.6 115/60/9.0 115/60/12.0 115/60/12.0 115/60/12.0 115/60/12.0

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.10 40

.10

Gas & Ignition

Std. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54 5/#42 5/#54

Gas Valve Honeywell SV

Regulation Type

Manifold Press. (Inch’s WC)

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series

Lock--Out Time HW HSP

NA HW HSP

Combustion

Flue Outlet Size (Inches) 4444444 4

Limits & Controls

Thermal Sensor (°F)

Limit Control 300

See Parts List 300

See Parts List

Std. Pressure Sw. (Part No)

Press (Close)

Press (Open)

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

Fan Control (Type)

Fan Control On

(Timed--secs) Off

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type (600 FPM)

Filter Size (²) (Not Supplied)

1600 CFM and over

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

10.3/1100

PSC/1/2

10/370

Washable

14x25x1

-- --

1.5

11--8

8/1050

PSC/1/2

7.5/370

Washable

14x25x1

-- --

1.5

11--10

10.3/1100

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

8/900

PSC/1/2

7.5/370

Washable

16x25x1

-- --

3.5

11--10

10/1050

PSC/1/2

10/370

Washable

16x25x1 (2)

16x25 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

5.5

11--10

10/1050

PSC/1/2

10/370

Washable

20x25x1

16x25 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

5.5

Gas Conversion Kits

Nat to LP NAHF002LP or *1009509

LP to Nat NAHF002NG, *1009510

* Must be ordered from Service Parts

Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

Multi Position Furnace Service Manual

31 440 08 2010 01

Manufacturers Number (Mfr No -SeeRatingPlate)

ALL Models (N8MPL) Specifications

N8MPL

050B12 N8MPL

075B12 N8MPL

075F16 N8MPL

100F20 N8MPL

100J22 N8MPL

125J20 N8MPL

125J22

General

Input (Btuh)

Output (Btuh)

Temp. Rise (°F)

50,000

40,000

35--65

75,000

60,000

35--65

75,000

60,000

25--55

100,000

80,000

35--65

100,000

80,000

30--60

125,000

100,000

30--60

125,000

100,000

30--60

Electrical (Volts/Hz/FLA) 115/60/9.8 115/60/8.9 115/60/10.6 115/60/12.0 115/60/12.0 115/60/12.0 115/60/12.0

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.10 40

.10

Gas & Ignition

Std. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54 5/#42 5/#54

Gas Valve Honeywell SV

Regulation Type

Manifold Press. (Inch’s WC)

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series

Lock--Out Time HW HSP

NA HW HSP

Combustion

Flue Outlet Size (Inches) 444444 4

Limits & Controls

Thermal Sensor (°F)

Limit Control 300

See Parts List 300

See Parts List

Std. Pressure Sw. (Part No)

Press (Close)

Press (Open)

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

Fan Control (Type)

Fan Control On

(Timed--secs) Off

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type (600 FPM)

Filter Size (²) (Not Supplied)

1600 CFM and over

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

10.3/1100

PSC/1/2

10/370

Washable

14x25x1

-- --

1.5

11--8

8/1050

PSC/1/2

7.5/370

Washable

14x25x1

-- --

1.5

11--10

10.3/1100

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

10/1050

PSC/1/2

10/370

Washable

16x25x1

-- --

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

5.5

11--10

10/1050

PSC/1/2

10/370

Washable

20x25x1

16x25 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

5.5

Gas Conversion Kits

Nat to LP NAHF002LP, *1009509

LP to Nat NAHF002NG, *1009510

* Must be ordered from Service Parts

Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

Multi Position Furnace

Service Manual

441 08 2010 01

Manufacturers Number (Mfr No -SeeRatingPlate)

ALL Models (*8MPN) Specifications

*8MPN

050B12 *8MPN

075B12 *8MPN

075F16 *8MPN

100F14 *8MPN

100F20 *8MPN

100J20 *8MPN

125J20 *8MPN

150J20

General

Input (Btuh)

Output (Btuh)

Temp. Rise (°F)

50,000

40,000

35--65

75,000

60,000

30--60

75,000

60,000

30--60

100,000

81,000

35--65

100,000

81,000

35--65

100,000

81,000

35--65

125,000

101,000

35--65

150,000

121,000

35--65

Electrical (Volts/Hz/FLA) 115/60/9.8 115/60/8.9 115/60/10.0 115/60/9.0 115/60/12.0 115/60/12.0 115/60/12.0 115/60/12.0

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.30 40

.30

Gas & Ignition

Std. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54 6/#42 6/#54

Gas Valve Honeywell SV

Regulation Type

Manifold Press. (Inch’s WC)

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series

Lock--Out Time HW HSP

NA HW HSP

Combustion

Flue Outlet Size (Inches) 4444444 4

Limits & Controls

Thermal Sensor (°F)

Limit Control

Auxiliary Limit (°F)

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

Std. Pressure Sw. (Part No)

Press (Close)

Press (Open)

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

Fan Control (Type)

Fan Control On

(Timed--secs) Off

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type (600 FPM)

Filter Size (²) (Not Supplies)

1600 CFM and over

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

10.3/1100

PSC/1/2

10/370

Washable

14x25x1

-- --

1.5

11--8

8/1050

PSC/1/2

7.5/370

Washable

14x25x1

-- --

1.5

11--10

10.3/1100

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

8/900

PSC/1/2

7.5/370

Washable

16x25x1

-- --

3.5

11--10

10/1050

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

11--10

10/1050

PSC/1/2

10/370

Washable

20x25x1

16x25 (2)

12--12

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

Gas Conversion Kits

Nat to LP NAHF002LP, *1009509

LP to Nat NAHF002NG, *1009510

* Must be ordered from Service Parts

Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

Multi Position Furnace Service Manual

33 440 08 2010 01

Manufacturers Number (Mfr No -SeeRatingPlate)

ALL Models (*8MPL) Specifications

*8MPL

050B12 *8MPL

075B12 *8MPL

075F16 *8MPL

100F20 *8MPL

100J20 *8MPL

125J20

General

Input (Btuh)

Output (Btuh)

Temp. Rise (°F)

50,000

40,000

35--65

75,000

60,000

30--60

75,000

60,000

30--60

100,000

81,000

35--65

100,000

81,000

35--65

125,000

101,000

35--65

Electrical (Volts/Hz/FLA) 115/60/9.8 115/60/8.9 115/60/10.0 115/60/12.0 115/60/12.0 115/60/12.0

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.30 40

.30

Gas & Ignition

Std. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54

Gas Valve Honeywell SV

Regulation Type

Manifold Press. (Inch’s WC)

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series

Lock--Out Time HW HSP

NA HW HSP

Combustion

Flue Outlet Size (Inches) 4444 4 4

Limits & Controls

Thermal Sensor (°F)

Limit Control

Auxiliary Limit (°F)

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

300

See Parts List

130

Std. Pressure Sw. (Part No)

Press (Close)

Press (Open)

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

Fan Control (Type)

Fan Control On delay

(Timed--secs) Off delay

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type

Filter Size (²) (Not Supplied)

1600 CFM and over

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

10.3/1100

PSC/1/2

10/370

Washable

14x25x1

-- --

1.5

11--8

8/1050

PSC/1/2

7.5/370

Washable

14x25x1

-- --

1.5

11--10

10.3/1100

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

10/1050

PSC/1/2

10/370

Washable

16x25x1

16x25 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

20x25x1

16x25 (2)

11--10

10/1050

PSC/1/2

10/370

Washable

20x25x1

16x25 (2)

Gas Conversion Kits

Nat to LP NAHF002LP, *1009509

LP to Nat NAHF002NG, *1009510

* Must be ordered from Service Parts

Two side filter racks (left and right) required for upflow applications. Side returns are not permitted with downflow or horizontal furnace applications.

Multi Position Furnace

Service Manual

441 08 2010 01

Manufacturers Number (Mfr No -SeeRatingPlate)

ALL Models Specifications

*8DNL050B12 *8DNL075B12 *8DNL075F16 *8DNL100F14 *8DNL100L20 *8DNL125L20

General

Input (Btuh)

Output (Btuh) +

Temp. Rise (°F)

50,000

40,000

35--65

75,000

60,000

35--65

75,000

60,000

35--65

100,000

80,000

35--65

100,000

80,000

30--60

125,000

100,000

35--65

Electrical (Volts/Hz/FLA) 115/60/8.9 115/60/7.6 115/60/10.6 115/60/8.9 115/60/11.2 115/60/11.2

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.10 40

.10

Gas & Ignition

Std. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54

Gas Valve Honeywell SV

Regulation Type

Manifold Press. (Inch’s WC)

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

9541

SNAP

3.5

9541

SNAP

10.0

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series

Lock--Out Time HW HSP

NA HW HSP

Combustion

Flue Outlet Size (Inches)

Std. Outlet Temp (°F) 4

<480 4

<480

Limits & Controls

Thermal Sensor (°F)

Limit Control 300

See Parts List 300

See Parts List

Std. Pressure Sw. (Part No)

Press (Close)

Press (Open)

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

1013529

--0.69

--0.59

Hi.Alt.PressureSw.(Part#)

6,000¢to 10,000¢

Press (Close)

Press (Open)

1014051

-- .57

-- .47

1014051

-- .57

-- .47

1014051

-- .57

-- .47

1014051

-- .57

-- .47

1014051

-- .57

-- .47

1014051

-- .57

-- .47

Fan Control (Type)

Fan Control On

(Timed--secs) Off

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

HW ST9160

60,100,140,180

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type

Filter Size (²)

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

8/1050

PSC/1/2

7.5/370

Washable

16x18x1 (2)

1.5

11--8

8/1050

PSC/1/3

5.0/370

Washable

16x18x1 (2)

1.5

11--10

10/1050

PSC/1/2

10/370

Washable

16x18x1 (2)

11--10

8/900

PSC/1/2

7.5/370

Washable

16x18x1(2)

3.5

11--10

11.9/900

PSC/3/4

40/370

Washable

16x18x1 (2)

11--10

11.9/900

PSC/3/4

40/370

Washable

16x18x1 (2)

Gas Conversion Kits

Nat to LP NAHF002LP (*1009509) or NAHL002LP (*1160991)

LP to Nat NAHF002NG, *1009510*

LP High Altitude *1160992

* Must be ordered from Service Parts

+ Tentative

Multi Position Furnace Service Manual

35 440 08 2010 01

Manufacturers Number (Mfr No --SeeRatingPlate)

ALL Models Specifications

*8MPV050B12A *8MPV075F14A *8MPV100J20A *8MPV125J20A

General

Gas Type Nat LP Nat LP Nat LP Nat LP

Transformer Size (VA)

T’stat Heat Anticipator 40

.10 40

.10

Input (Btuh) Std/Alt. Hi Fire

Lo Fire

Output (Btuh) Std/Alt. Hi Fire

Lo Fire

Temp. Rise (°F) Hi Fire

Lo Fire

50,000

35,000

40,000

28,000

30--60

25--55

75,000

52,500

60,000

42,000

30--60

25--55

100,000

70,000

81,000

61,000

35--65

125,000

87,500

101,000

71,000

30--60

25--55

Electrical (Volts/Hz/FLA) 115/60/8.2 115/60/9 115/60/12 115/60/12

Gas & Ignition

Gas Type

Std. Main Orifices (No/Size) Nat

2/#42 LP

2/#54 Nat

3/#42 LP

3/#54 Nat

4/#42 LP

4/#54 Nat

5/#42 LP

5/#54

Gas Valve (Honeywell)

Regulation Type

Manifold Press. Hi Fire (²WC)

Lo Fire (²WC)

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series HW HSP HW HSP HW HSP HW HSP HW HSP HW HSP HW HSP HW HSP

Combustion

Flue Outlet Size (Inches) 4 4 4 4 4 4 4 4

Limits & Controls

Fan Control (Type)

Fan Control On delay

(Timed--secs) Off delay

HW ST9162

60,100,140,180

HW ST9162

60,100,140,180

HW ST9162

60,100,140,180

HW ST9162

60,100,140,180

Thermal Sensor (°F)

Limit Control Setting (°F) 300

See Limit in Parts List 300

See Limit in Parts List

Std. Pressure Sw. (Part #)

Hi Fire Press (Close)

Hi Fire Press (Open)

Lo Fire Press (Close)

Lo Fire Press (Open)

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Filter Type

Filter Size (²)

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

4.6/1050

DC/1/2

Washable

14x25x1/2

1.5

11--10

12/900

DC/1

Washable

16x25x1/2

1.5

3.5

11--10

12/900

DC/1

Washable

16x25x1/2(2)

11--10

12/900

DC/1

Washable

16x25x1/2(2)

Gas Conversion Kits

Nat to LP

LP to Nat *1011789

*1011787 *1011789

*1011787

*Must be ordered from Service Parts

Use the Fuel Gas Code to establish proper vent sizing.

Multi Position Furnace

Service Manual

441 08 2010 01

Manufacturers Number (Mfr No --SeeRatingPlate)

ALL Models Specifications

*8MPT050B12A *8MPT075F14A *8MPT100F14A *8MPT100J20A *8MPT125J20A

General

Gas Type Nat LP Nat LP Nat LP Nat LP Nat LP

Input (Btuh) Std/Alt. Hi Fire

Lo Fire

Output (Btuh) Std/Alt. Hi Fire

Lo Fire

Temp. Rise (°F) Hi Fire

Lo Fire

50,000

35,000

40,000

28,000

30--60

25--55

75,000

52,500

60,000

42,000

30--60

25--55

100,000

70,000

81,000

57,000

35--65

100,000

70,000

81,000

61,000

35--65

125,000

87,500

101,000

71,000

30--60

25--55

Electrical (Volts/Hz/FLA) 115/60/5.3 115/60/9.2 115/60/9.2 115/60/12 115/60/12

Transformer Size (VA)

T’stat Heat Anticipator 40

.30 40

.30

Gas & Ignition

GStd. Main Orifices (No/Size) 2/#42 2/#54 3/#42 3/#54 4/#42 4/#54 4/#42 4/#54 5/#42 5/#54

Gas Valve (Honeywell)

Regulation Type

Manifold Press. Hi Fire (²WC)

Lo Fire (²WC)

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

SV 9541

SNAP

3.5

1.7

SV 9541

SNAP

10.0

4.9

Pilot Orifice Size .018 .011 .018 .011 .018 .011 .018 .011 .018 .011

Ignition Type/Series (Honeywell) HSP HSP HSP HSP HSP HSP HSP HSP HSP HSP

Combustion

Flue Outlet Size (Inches 4 4 4 4 4 4 4 4 4 4

Limits & Controls

Fan Control (Type)

Fan Control On delay

(Timed--secs) Off delay

HW ST9162A

60,100,140,180

HW ST9162A

60,100,140,180

HW ST9162A

60,100,140,180

HW ST9162A

60,100,140,180

HW ST9162A

60,100,140,180

Thermal Sensor (°F)

Limit Control Setting (°F) 300

See Limit in Parts List 300

See Limit inParts List 300

See Limit in Parts List 300

See Limit in Parts List

Std. Pressure Sw. (Part No)

Hi Fire Press (Close)

Hi Fire Press (Open)

Lo Fire Press (Close)

Lo Fire Press (Open)

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

1013862

--0.69

--0.59

--0.40

--0.30

Blower Data

Type & Size

Motor Amps/Rpm

Motor Type/H.p.

Cap. Mfd/Volts

Filter Type

Filter Size (²)

Min. Cool Cap. (Tons)

Max. Cool Cap. (Tons)

11--8

10.3/1100

PSC/1/2

10/370

Washable

14x25x1

1.5

11--10

10.3/1100

PSC/1/2

10/370

Washable

16x25x1

1.5

3.5

11--10

8/900

PSC/1/2

7.5/370

Washable

16x25x1

1.5

3.5

11--10

10/1050

PSC/3/4

40/370

Washable

16x25x1 (2)

11--10

10/1050

PSC/1/2

40/370

Washable

16x25x1 (2)

Gas Conversion Kits

Nat to LP

LP to Nat *1011789

*1011787 *1011789

*1011787

*Must be ordered from Service Parts

Use the Fuel Gas Code to establish proper vent sizing.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Multi Position Furnace Service Manual

37 440 08 2010 01

27. Circulation Air Blower Data

N8MPN/L050B12 & *8MPN/L050B12

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 454 672 1116 1335

.30 351 609 1055 1237

.50 278 550 991 1160

.70 201 498 897 1029

.90 -- -- -- 422 783 903

1.00 -- -- -- 353 718 822

N8MPN/L075B12 & *8MPN/L075B12

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 665 925 1171 1501

.30 616 893 1136 1407

.50 563 840 1074 1307

.70 517 741 977 1200

.90 442 650 866 1050

1.00 394 593 804 963

N8MPN/L075F16 & *8MPN/L075F16

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 803 1091 1548 2194

.30 760 1082 1557 2070

.50 699 1028 1500 1913

.70 618 934 1369 1708

.90 502 772 1138 1447

1.00 423 661 984 1254

N8MPN100F14 & *8MPN100F14

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 742 916 1287 1723

.30 625 845 1195 1638

.50 525 747 1079 1515

.70 440 662 1006 1371

.90 348 553 868 1185

1.00 297 490 787 1066

N8MPN/L100F20, *8MPN/L100F20, N8MPL100J20 &

*8MPN/L100J20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1845 2058 2285 2508

.30 1790 1992 2189 2379

.50 1714 1903 2066 2232

.70 1592 1769 1914 2049

.90 1404 1571 1711 1839

1.00 1291 1444 1541 1694

N8MPN/L100J22

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1820 2144 2218 2252

.30 1747 1982 2135 2254

.50 1680 1862 1996 2092

.70 1551 1668 1819 1899

.90 1353 1448 1584 1744

1.00 1253 1380 1504 1633

N8MPN/L125J20 & *8MPN/L125J20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 839 1211 1584 2267

.30 829 1188 1559 2151

.50 798 1111 1553 2049

.70 734 1079 1505 1912

.90 651 1015 1400 1704

1.00 595 897 1308 1585

N8MPN/L125J22

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1832 2041 2257 2366

.30 1766 1958 2144 2291

.50 1700 1864 2001 2116

.70 1567 1705 1812 1956

.90 1393 1507 1639 1750

1.00 1284 1395 1529 1618

*8MPN150J20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1590 1827 2073 2283

.30 1519 1708 1993 2262

.50 1440 1623 1904 2150

.70 1331 1525 1774 1991

.90 1163 1381 1579 1813

1.00 1079 1277 1494 1694

* Denotes Brand

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Exterrnal Static Pressure

Inches of W.C.

Multi Position Furnace

Service Manual

441 08 2010 01

*8DNL050B12/075F16

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 673 929 1211 1481

.30 599 815 1138 1365

.50 490 733 1049 1266

.70 394 595 884 1068

.90 297 451 641 910

1.00 238 420 510 777

*8DNL075B12Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 649 748 975 1390

.30 540 668 926 1317

.50 445 575 1172 1201

.70 379 463 733 1056

.90 216 300 592 882

1.00 168 192 524 768

*8MDNL100F14

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 714 963 1310 1812

.30 553 845 1216 1658

.50 463 742 1125 1546

.70 365 658 989 1425

.90 -- -- -- 629 834 1233

1.0 -- -- -- 419 733 1083

*8DNL100F14

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1738 1963 2150 2288

.30 1651 1839 2015 2125

.50 1560 1722 1859 1975

.70 1421 1566 1699 1789

.90 1239 1385 1500 1583

1.00 1030 1225 1361 1451

*8DNL125L20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED H HIGH

.10 1860 2085 2226

.30 1776 1954 2138 2246

.50 1662 1830 1981 2084

.70 1478 1629 1787 1878

.90 1279 1432 1539 1623

1.00 1168 1301 1369 1478

* Denotes Brand

Multi Position Furnace Service Manual

39 440 08 2010 01

Circulation Air Blower Data - *8MPV

Heating, Cooling & Continuous Airflow Settings

Continuous Blower (CFM) @ 0.10²

²²

²Static

Switch Settings Furnace Model

#1 #2 50K 75K 100/125K

0* 0* 911 1046 1174

0 1 777 903 1032

1 0 664 771 858

1 1 542 632 698

*Factory Setting

Heating Air Temperature Adjustment (°

°°

°F)*

Switch Settings Furnace Model

#3 #4 #5 50K 75K 100K 125K

0** 0** 0** 0 0 0 0

0 0 1 1 1 3 3

0 1 0 2 2 5 5

0 1 1 3 4 7 8

1 0 0 6 5 8 10

1 0 1 -- 3 -- 3 -- 5 -- 1

1 1 0 -- 5 -- 6 -- 8 -- 2

1 1 1 -- 7 -- 9 -- 12 -- 4

*Approximate air temperature change from factory setting @ 0.20²static

on high heat )low heat speed changes with change of high heat speed on

most settings)

**Factory setting

Cooling (CFM) @ 0.50²

²²

²Static

(See Figure 1 -- 3 for complete Airflow Range)

Switch Settings Furnace Model

#6 #7 #8 50K 75K 100/125K

0* 0* 0* 1167 1414 2169

0 0 1 1115 1306 2003

0 1 0 1000 1209 1806

0 1 1 907 1105 1601

1 0 0 810 1009 1408

1 0 1 760 907 1204

1 1 0 703 842 1006

1 1 1 656 816 813

*Factory setting

*EXAMPLE

Cooling Airflows Switches 6, 7 & 8:

000 3.5 Ton

001 3.0 Ton

010 2.5 Ton

011 2.0 Ton

*See “Technical Support Manual”

for correct airflow rates.

010

Blower Motor Settings

INPUT

SIGNAL OR

THERMOSTAT

CONNECTIONS

Multi Position Furnace

Service Manual

441 08 2010 01

Circulation Air Blower Data - *8MPV

Heating, Cooling & Continuous Airflow Settings

*8MPV050B12 COOLING

200

400

600

800

1000

1200

1400

0.1 0.2 0.3 0.5 0.7 1.0

" w.c. ESP

SCFM

000

001

010

011

100

101

110

111

Figure 1

*8MPV075F14 COOLING

200

400

600

800

1000

1200

1400

1600

1800

0.1 0.2 0.3 0.5 0.7 1.0

" w.c. ESP

CFM

000

001

010

011

100

101

110

111

Figure 2

Multi Position Furnace Service Manual

41 440 08 2010 01

Circulation Air Blower Data - *8MPV

Heating, Cooling & Continuous Airflow Settings

8MPV100J20 COOLING

500

1000

1500

2000

2500

0.10.20.30.50.71.0

"w.c. ESP

CFM

000

001

010

011

100

101

110

111

Figure 3

8MPV125J20 COOLING

500

1000

1500

2000

2500

0.1 0.2 0.3 0.5 0.7 1.0

"w.c. ESP

CFM

000

001

010

011

100

101

110

111

Figure 4

Multi Position Furnace

Service Manual

441 08 2010 01

CIRCULATION AIR BLOWER DATA

*8MPT050B

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED MED H HIGH

.10 675 859 -- -- 1015 1394

.20 662 846 -- -- 999 1342

.30 651 819 -- -- 977 1289

.40 636 795 -- -- 952 1227

.50 608 765 -- -- 914 1163

.60 564 735 -- -- 870 1086

.70 514 685 -- -- 818 1002

*8MPT075F14 & *8MPT100F14

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED MED H HIGH

.10 691 882 -- -- 1211 1633

.30 591 850 -- -- 1155 1544

.50 536 785 -- -- 1089 1464

.70 433 711 -- -- 982 1307

.90 342 856 -- -- 850 1120

1.00 308 527 -- -- 763 1041

*8MPT100J20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED MED H HIGH

.10 1210 1441 -- -- 1773 2104

.20 1201 1430 -- -- 1740 2078

.30 1197 1453 -- -- 1740 2061

.40 1191 1441 -- -- 1718 2020

.50 1167 1425 -- -- 1707 2005

.60 1160 1390 -- -- 1676 1953

.70 1130 1365 -- -- 1654 1917

*8MPT125J20

Air Delivery in Cubic Feet per Minute (C.F.M.)

(Furnace Rated @0.5²

²²

²WC ESP)

TAP LOW MED L MED MED H HIGH

.10 1264 1520 -- -- 1841 2161

.20 1251 1506 -- -- 1803 2132

.30 1249 1486 -- -- 1772 2079

.40 1219 1456 -- -- 1736 2042

.50 1168 1427 -- -- 1702 1991

.60 1178 1415 -- -- 1672 1914

.70 1143 1358 -- -- 1614 1838

INDEX

Adjusting Heat Anticipator, 10

Adjusting Manifold Pressure, 7

Air Proving Switch, See Pressure Switch

Auxiliary Limit Switch, 12

Blower Assembly, Conditioned Air, 18

Blower Speeds, Changing, 18

Blower Speeds, Selecting, 18

Burners, 8

Capacitors, 17

Checking Capacitors, 17

Checking Flame Current, 17

Checking Grounding and Polarity, 4

Checking Input (Firing) Rate, 6

Checking Manifold Pressure, 7

Checking Temperature Rise, 9

Circulating Air Blower Data, 37

Combustion Air/Vent Piping, 14

Combustion Blower. See Exhaust Blower

Control Wiring, 11

“DIP” Switch Settings, ST9160, 15

Electrical Supply, 4

Electrical Variation (SV9541M),25

Electronic Fan Timer, 15

Fan Timer, Electronic, 15

Flame Current, Checking, 17

Gas Valve/Ignition Control, Honeywell SV9541M, 16

Ground, Electrical, 4

Heat Anticipators, 10

Heat Exchanger Removal/Replacement, 20

High Altitude Operation, 7

Honeywell ST9160B Fan Timer, 19

Honeywell SV9541 Gas Valve/Ignition Control, 16

Inlet Air Restrictor, 10

Interlock Switch, 5

Introduction, 1

Kits, Twinning, 11

Limit Switches, 11

Piping, Vent/Combustion Air, 14

Polarity, Line Voltage, 4

Pressure Switches, 13

Pressures, Approximate Operating, 13

INDEX

Roll Out Limit Switch, 12

Room Thermostat, 10

Sequence of Operation Chart, SV9541M, 21

ST9160 Testing Sequence, 15

Supply, Electrical, 4

Supply, Gas, 6

SV9541M System Operation, 16

Switch, Blower Door Interlock, 5

Switch, “DIP”-- ST9140, 15

Switch, Auxiliary Limit, 12

Switch, Transition Pressure, 12

Switch,L.P.GasPressure,8

Switch, Main Limit, 11

Switch, Pressure, 12--13

Switch, Roll Out Limit, 12

Switches, Limit, 11

Technical Service Data , 30 -- 36

Temperature Rise, 9

Testing Sequence, ST9160, 15

Thermostat, Room, 10

Transition Pressure Switch, 13

Troubleshooting Chart, Honeywell SV9541M, 23

Twinning Kits, 11

Unit Identification, 2

Vent Termination, Standard, 14

Vent/Combustion Air Piping, 14

Wiring Diagram, 26 -- 29

Wiring, Control, 10

N8MPN100F14B1 44108201001

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