ICP N9MP1100F14A, N9MP1050A12A, N9MP1100J20A, N9MP1125J20A, N9MP2050A12A Installation Instructions Manual

N9MP2

Four Position Condensing Gas Furnace

SAFETY REQUIREMENTS

Recognize safety information. This is the safety-alert symbol/X X. When you see this symbol on the furnace and in instructions or
manuals be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, or CAUTION. These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could

result in personal injury or death. CAUTION is used to identify unsafe practices that could result inminor personal injury or product and
property damage.

Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified person-
nel should install, repair, or service heating equipment.

Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations
must be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags,

and on labels attached to or shipped with the unit and other safety precautions that may apply.
Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (N FGC) NFPA

No. 54/ANSIZ223.1. In Canada, refer to the current edition of the National Standard Canada CAN/CGA-B149.1 - and .2-M91 Natural
Gas and Propane Installation Codes (NSCNGPIC). Wear safety glasses and work gloves. Have fire extinguisher available during start-

up and adjustment procedures and service calls.

These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential

construction practices. We requre these instructions as a minimum for a safe installation.

Manufactured by:

International Comfort Products Corporation (USA)

Lewieburg, TN USA 87091

Table of Contents

1.SafeInstallationRequirements................. 4

2.Installation................................ 5

3.Combustion&VentilationAir .................. 8

4.Vent& CombustionAirPiping ................ 10

5.GasSupplyandPiping ...................... 24

6.ElectricalWiring ........................... 28

7.DuctworkandFilter(Upflow/Horizontal)......... 29

8. ChecksandAdjustments.................... 33

9.FurnaceMaintenance ....................... 35

10.SequenceofOperation&Diagnostics.......... 35

11.ConcentricVentTermination................. 40

Fire or Explosion hazard.

This furnace is not designed for use in mobile

homes, trailers or recreational vehicles.
Such use could result in death, bodily injury

and/or property damage.

Printed in U.S.A. LP1 9/4/2001 440 01 1010 04

N9MP1 - Indoor combustion air (1 pipe only)

N9MP2 - Direct Vent ONLY (2 pipe only)

*9MPD - Dual Certified Venting (1 or 2 pipes)

*Denotes Brand

*9

Brand
Brand Identifier

8 = Non-Condensing, 80+% Gas Furnace
9 = Condensing, 90+% Gas Furnace

Installation Configuration
UP = Upflow

DN = Downfiow
UH = Upflow/Horizontal

HZ = Horizontal
DH = Downfiow/Horizontal

MP = Multiposition, Upflow/Downflow/Horizontal

Major Design Feature

= One (Single) Pipe
2 = Two Pipe
D=I or2Pipe

L = Low NOx

* Denotes Brand

N = Single Stage
P = PVC Vent

T = Two Stage
V = Variable Speed

MP D 0 75 B 12 A

/

1

Engineering Rev.

L

Denotes minor changes

MarketingDigit

Denotes minor change

Cooling Airflow

08 = 800 CFM

12 = 1200 CFM
14 = 1400 CFM

16 = 1600 CFM
20 = 2000 CFM

Cabinet Width

B = 15.5" Wide

F = 19.1" Wide
J = 22.8" Wide

L = 24.5" Wide

Input (NominalMBTUH)

Printed in U.S.A. LP1 9/4/2001 440 01 1010 04

START-UP CHECK SHEET

For 90+ Furnace

(Keep this page for future reference)

Dealer Name:

Address:

City, State(Province), Zip or Postal Code:

Business Card Here

Phone:
Owner Name:

Address:

City, State(Province), Zip or Postal Code:

Model Number:

Serial Number:

Type of Gas: Natural: [_

Which blower speed tap is used?

(Heating). (Cooling)

Temperature of Supply Air:

Temperature of Return Air:

LP: _1

(°F). or(°C).

(°F) or(°C)

Rise (Supply Temp,-Return Temp,): (°F) or(°C).__

Filter Type and Size:

Fan "Time ON" Setting:

Fan "Time OFF" Setting:

Manual Gas Shut-Off Upstream

of Furnace/Drip-Leg?

Condensate Drain Connected?

YES _1 NO _1

YES _1 NO _1

NO_1

Condensate Drain Trapped? YES [_

Transition Pressure switch hose relocated for U/D/H
Application? YES _ NO _

Blower Speed Checked? YES _1 NO _1

All Electrical Connections Tight? YES _1 NO _1

Gas Valve OK? YES _ NO _

Measured Line Pressure When Firing Unit:

Calculated Firing Rate:(See Checks andAdjustments Sec-
tion),.

Temperature Rise (supply-return temperature):(°F)__

Measured Manifold Gas Pressure:

Static Pressure (Ducts): Supply Air Return

Date of Start-Up:

CO ?

0O2 ?

Dealer Comments:

44001 101004

1. Safe Installation Requirements

Installation or repairs made by unqualified
persons can result in hazards to you and others.
Installation MUST conform with local codes or, in

the absence of local codes, with codes of all

governmental authorities having jurisdiction.

The information contained in this manual is

intended for use by a qualified service technician
who is experienced in such work, who is familiar
with all precautions and safety procedures

required in such work and is equipped with the

proper tools and test instruments.

Failure to carefully read and follow all instruc-
tions in this manual can result in furnace

malfunction, death, personal injury and/or

property damage.

NOTE: This furnace is design certified by the Canadian Stan-

dards Association (CSA) for installation in the United States and
Canada. Refer to the appropriate codes, along with Figure 1 or

Figure 2 and this manual, for proper installation.

• This furnace is NOT approved for installation in

mobile homes, trailers or recreation vehicles,

• Do NOT use this furnace as a construction heater or to
heat a building that is under construction.

Use only the Type of gas approved for this furnace (see

Rating Plate on unit). Overfiring will result in failure of
heat exchanger and cause dangerous operation. (Fur-
naces can be converted to LR gas with approved kit.)

• Do NOT use open flame to test for gas leak.

heaters, furnaces, gas-fired fireplaces, wood fireplaces,
and several other items. Carbon monoxide can cause seri-

ous bodily injury and/or death. Therefore, to help alert
people of potentially dangerous carbon monoxide levels,
you should have carbon monoxide detectors listed by a na-
tionally recognized agency (e.g. Underwriters Laborato-

ries or International Approval Services) installed and

maintained in the building or dwelling (see Note below).
Carbon monoxide or "CO" is a colorless and odorless gas

produced when fuel is not burned completely or when the
flame does not receive sufficient oxygen.

B. There can be numerous sources of fire or smoke in a build-

ing or dwelling. Fire or smoke can cause serious bodily in-
jury, death, and/or property damage. Therefore, in order to
alert people of potentially dangerous fire or smoke, you
should have fire and smoke detectors listed by Underwrit-

ers Laboratories installed and maintained in the building or
dwelling (see Note below).

Note: The manufacturer of your furnace does not test any de-

tectors and makes no representations regarding any brand
or type of detector.

C. To ensure safe and efficient operation of your unit, you

should do the the following:

1. Thoroughly read this manual and labels on the unit.

This will help you understand how your unit operates and
the hazards involved with gas and electricity.

2. Do not use this unit if any part has been under water.

Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system and

any gas control which has been under water.

3. Never obstruct the vent grilles, or any ducts that pro-

vide air to the unit. Air must be provided for proper com-

bustion and ventilation of flue gases.

FreezingTemperaturesand YourStructure

• Ensure adequate combustion and ventilation air is pro-
vided to the furnace.

• Seal around supply and return air ducts.

• The vent system MUST be checked to determine that it is
the correct type and size.

• Install correct filter type and size.

Freeze warning.

Turn off water system.

If your unit remains shut off during cold weather
the water pipes could freeze and burst, resulting
in serious water damage.

• Unit MUST be installed so electrical components are
protected from direct contact with water.

NOTE: It is the personal responsibility and obligation of the end
user to contact a qualified installer to ensure that the installation is
adequate and conforms to governing codes and ordinances.

Safety Rules

Your unit is built to provide many years of safe and dependable
service provided it is properly installed and maintained. However,
abuse and/or improper use can shorten the life of the unit and
create hazards for you, the owner.

A. The U.S. Consumer Product Safety Commission recom-

mends that users of gas- burning appliances install carbon
monoxide detectors. There can be various sources of car-

bon monoxide in a building or dwelling. The sources could
be gas-fired clothes dryers, gas cooking stoves, water

Your unit is equipped with safety devices that may keep it from op-
erating if sensors detect abnormal conditions such as clogged ex-

haust flues.

If your unit remains shut off during cold weather the water pipes

could freeze and burst, resulting in serious water damage.

Ifthe structure will be unattended during cold weather you should

take these precautions.

1. Turn off main supply water into the structure and drain the
water lines if possible. Open faucets in appropriate areas.

2. Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes

from freezing. Suggest they call qualified service agency, if

required.

Winter Shutdown

If you go away during the winter months and do not leave the heat

on in your home, the plastic transition box and the condensate

44001 101004

traponthefurnacemustbeprotectedfromfreezedamage.(See

Figure8troughFigure15)

1. Disconnectthe5/8"ODrubberhosefromtheventdrainfit-
tingthatislocateddownstreamofthecombustionblower.

Insertafunnelintothehoseandpourfour(4)ouncesof
sanitarytype(RV)antifreezeintothecondensatetrap.Re-
connectthe5/8"ODrubberhosetothestubonthevent
drainfitting.Securewiththehoseclamp.

2. Installation

2. Disconnect the 3/4" OD rubber hose from the condensate
trap. Insert a funnel into the hose and and pour four(4)

ounces of sanitary type (RV) antifreeze into the plastic
Transition box. Squeeze the hose together near the end
and quickly reconnect the 3/4" OD rubber hose to the stub

on the condensate trap. Secure with the hose clamp.

When you return home, your furnace will be ready to start, as it is
not necessary to drain the antifreeze from the furnace.

Poison carbon monoxide gas Hazard.

This furnace can NOT be common vented or

connected to any type B, BW or L vent or vent
connector, nor to any portion of a factory-built or
masonry chimney. If this furnace is replacing a
previously common-vented furnace, it may be
necessary to resize the existing vent and
chimney to prevent oversizing problems for the
other remaining appliance(s). See Venting and

Combustion Air Check in Gas Vent Installation
section. This furnace MUST be vented to the
outside.

Failure to properly vent this furnace or other
appliances can result in death, personal injury
and/or property damage.

LocationandClearances

Refer to Figure 1 or Figure 2 for typical installation and ba-

sic connecting parts required. Refer to Figure 4 for typical

horizontal direct vent installation and basic connecting
parts required. Supply and return air plenums and duct are

also required.

If furnace is a replacement, it is usually best to install the

furnace where the old one was. Choose the location or
evaluate the existing location based upon the minimum

clearance and furnace dimensions (Figure 3).

CAUTION

Special precautions MUST be made if installing

furnace in an area which may drop below freezing. This
can cause improper operation or damage to
equipment. Iffurnace environment has the potential of

freezing, the drain trap and drainline must be

protected. The use of electric heat tape or RV

antifreeze is recommended for these installations.

(See "Condensate Trap Freeze Protection Section")

Do NOT operate furnace in a corrosive atmosphere

containing chlorine, fluorine or any other damaging
chemicals. Refer to Combustion & Ventilation Air

section, Contaminated Combustion Air.

Typical Upflow Installation

AIuminumornon-rustingshietdrecommended.
(SeeVentTerminationShieldingfordimensions).

•8" Min. _ I_
20' Max. rq _ InletPipe Ooup%gonendsoi

in same <_ (_ _-_ (notusedon exhaustpipe.Total

atmospheric Single Pipe pipe& couplingout-
zone model) sidestructure= 8"

VentPipes MUSTbe
supported
Horizontallyand

Vertically

Min.
Max.

zone

* Increaseminimumfrom8" to 18" forcold climates (sustainedtemperatures

below0 oF). 25-23-33

Typical Downflow Installation

SeeVentTermination
ShieldinginVentSection.

I_ "8" Min.

Inlet Pipe _ _] 20' Max.
(notusedon_H in same

single pip-_(_ c_) atmospheric zone
model)

Vent PipesMUSTb
supportedHorizonta
andVertically

\_ _ "////_/////////Y////_

Couplingon inside
andoutsideofwait

torestrainventpipe

Min.
Max.

same

* Increaseminimumfrom8" to 18" for coldclimates(sustainedtemperatures

below0°F).

25-23-33a

44001 101004

Dimensions and Clearances

TOP

_=1 F I_ AIRd'NT)ANE (N9M P2 & _9MPD

]

LEFT SIDE [_5"/_L

TRAP (DOWNFLOW) j_ _1 )

VEN GpS _

413/16

TRFALPoW/RORIZONTAL_ _

THERMOSTAT fT_ 7 _

215/8 1 47/8

24

11,,4

ELECTRICAL

11,,16

1 11/16

13£8 2 3/4

175/16 / 2_,7,'8

24 /1_

3111,,16

BOTTOM

Unit

Capacity

N9MP1050B12A
N9MP1075B12A
N9MP1100F14A

N9MP1100J20A
N9MP1125J20A

N9MP2050B12A
N9MP2075B12A
N9MP21OOF14A

NgMP2100J20A
NgMP2125J20A

*9MPD05OF12A
*9MPD075F12A

*gMPD100J14A
*gMPD100J20A

*9MPD125L2OA

Cabinet Bottom

D

125/8
125/8

143/4
183/4

183/4
125/8

125/8
143/4

183/4
183/4
143/4

143/4
183/4

183/4

23

A

B_

FRONT

113,,16

1913/16

Cabinet to Combustible Clearances

TOPBOT.R. FRONTFL E

1 0 0 0 0 3 0

ALL DIMENSIONS IN INCHES

GAS

\

281/2

181/2

r

RIGHT SIDE

TRAP (DOWNFLOW)

ELECTR)CAL

A]RINTAKE
(ALTERNATE)

VENT

TRAP

11,,16 (UPFLOW/HORIZONTAL)

L

THERMOSTAT 21/4

131/4

• (;

-- 215/8

24

25-23-36A

[_ 44001 101004

InstallationRequirements

1. Install furnace level.

2. This furnace is NOT to be used for temporary heat of build-
ings or structures under construction.

3. Install furnace as centralized as practical with respect to the
heat distribution system.

4. Install the vent pipes as short as practical. (See Vent and
Combustion Air Piping section).

5. Maintain clearance for fire safety and servicing. A front
clearance of 30" is recommended for access to the burner,
controls and filter.

6. Use a raised base for upflow furnace if the floor is damp or
wet at times.

For downflow installations, non combustible subbase must
be used under the furnace unless installation is on a non

combustible floor surface. This requirement applies even
when a coi! box or cabinet is used.

Fire Hazard.
Place furnace on noncombustible subbase on

downflow applications, unless installing on
non-combustible flooring.

Failure to install unit on noncombustible
subbase can result in death, personal injury

and/or property damage.

9.

For horizontal installations, line contact is permissible only
between lines formed by intersection of back and two sides

of furnace jacket, and building joists, studs or framing.

Residential garage installations require:

Burners and ignition sources installed at least 18" above

the floor.

• Located or physically protected from possible damage
by a vehicle.

10. Local codes may require a drain pan under the entire fur-
nace and condensate trap when the furnace is installed in

attic application.

InstallationPositions

This furnace can be installed in an upflow, horizontal (either left or

right) or downflow airflow position. DO NOT install this furnace on

its back. For the upflow position, the return air ductwork can be
attached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must

be attached to the bottom. The return air ductwork must never be
attached to the back of the furnace.

FurnaceInstallationConsiderations

The installation of the furnace for a given application will dictate
the position of the furnace, the airflow, ductwork connections,

vent and combustion air piping. Consideration must be given to
the following:

CondensateTrap and Drain Lines

The supplied condensate trap must be attached to the furnace
side panel on either the left or right side. For horizontal installa-
tions, the drain trap is vertically attached to the side panel below

the furnace. A minimum clearance of 5" below the furnace is re-
44001 101004

quired for the condensate trap. Downward slope of the conden-
sate drain line from the condensate trap to the drain location must

be provided. Adequate freeze protection of the drain trap and the
drain line must be provided. See "Condensate Drain Trap"section

for further details.

Leveling

Proper leveling of the furnace must be provided to insure proper
drainage of the condensate from the furnace. The furnace must
be level to within 1/4" from front to back and from side to side for

upflow and downflow installations or top to bottom for horizontal
installations.

Vent and Combustion Air Connections

On the Dual Certified furnace, the vent and combustion air pipes
attach to the furnace through the top panel for the upflow and hori-
zontal installations. For the downflow installation, the vent and
combustion air pipes attach to the furnace through the alternate

locations on the furnace side panels.
Note: On the Direct Vent furnace, the vent pipe attaches to the fur-

nace through the side panels. The combustion air pipe attaches to
the top panel or to the alternate location on the side panel.
On the Single Pipe furnace, the vent pipe attaches to the furnace

through the furnace side panels.
Note: Repositioning of the combustion blower is required for the

vent pipe connection to the furnace through the "right side" panel.
See "Vent and Combustion Air Piping" section for further details.

HorizontalFurnaceInstallation

This furnace can be installed horizontally in an attic, basement,
crawl space, alcove, or suspended from a ceiling in a basement or
utility room. See Figure 4. Do not install furnace on its back or in

the reverse airflow positions as safety control operation will be ad-
versely affected.

Typical Horizontal Installation

Inlet Pipe (notusedonSinglePipemodel)

Vent

Pipe

Condensate
Trap

25-23-34

NOTE: 5" bottom clearance required for condensate trap.

If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe

straps or an angle iron frame to ridgely attach the furnace to pre-
vent movement. These straps should be attached to the furnace

with sheet metal screws and to the rafters or joists with bolts. The
preferred method isto use an angle iron frame bolted to the rafters
or joists. (Take caution to allow door panels to be removed for
maintenance)

If the furnace is to be installed in a crawl space, consult local

codes. A suitable concrete pad or blocks are recommended for
crawl space installation on the ground.

NOTE: 5" bottom clearance required for condensate trap.

Thirty (30) inches between the front of the furnace and adjacent
construction or other appliances MUST be maintained for service

clearance.

Keep all insulating materials clear from Iouvered door. Insulating

materials may be combustible.

3. Combustion & Ventilation Air

Poison carbon monoxide gas Hazard.

The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clear-

ances are met. See Figure 3.

This furnace MUST NOT be installed directly on carpeting or tile
or other combustible material other than wood flooring or sup-

ports.

For horizontal installation over a finished living space. A field fab-
ricated auxiliary drain pan with drain pipe is recommended to pre-

vent damage by overflow due to blocked condensate drain.

Vent Check

Use methods described here to provide

combustion and ventilation air.

Failure to provide adequate combustion and

ventilation air can result in death and/or

personal injury.

Ventingand CombustionAir Check

NOTE: The following information is supplied to allow the installer

to make adjustments to the setup of existing appliances, IF

REQUIRED, based on good trade practices, local codes, and

good judgement of the installer. Manufacturer does NOT take re-
sponsibility for modifications made to existing equipment.

NOTE: If this installation replaces an existing furnace from a
commonly vented system, make sure there is adequate combus-
tion air for all appliances, MAKE THE FOLLOWING CHECK.

1. Seal any unused openings in the venting system.

Visually inspect the venting system for proper size and hor-

izontal pitch to ensure there is no blockage or restriction,
leakage, corrosion or other deficiencies which could cause

an unsafe condition.

Insofar as is practical, close all doors and windows and all

doors between the space in which the appliance(s) remain-

ing connected to the venting system are located and other

spaces of the building.

Vent Pipe--_ I A/ Draft Hood

Typical Gas

WaterHeater / Matc.

I I

I 1

7. After it has been determined that each appliance vents
properly, return doors, windows, appliances etc. to their

normal condition.

8. If improper venting is observed, the cause MUST be cor-

rected using the appropriate tables in code books of coun-

try having jurisdiction.

NOTE: if flame pulls towards draft hood, this indicates sufficient
venting.

NOTE: Non direct vent appliances occupying same enclosed
space as furnace MUST have enough air for proper combustion
and ventilation. All duct or openings for supplying combustion and

ventilation air must comply with the gas and electrical codes of the
country having jurisdiction.

When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting

And Combustion Air Check in this manual.

Air Openingsand ConnectingDucts

1. Total input rating for all non direct vent gas appliances
MUST be considered when determining free area of open-

ings.

2. Connect ducts or openings directly to outside.

3. When screens are used to cover openings, they MUST be
no less than 1/4" mesh.

4. The minimum dimension of rectangular air ducts MUST

NOT be less than 3".

G3

Turn on clothes dryers and any appliance not connected to
the venting system. Turn on any exhaust fans, such as

range hoods and bathroom exhausts, so they will operate

at maximum speed. Do not operate a summer exhaust fan.

Close fireplace dampers.

Followthe lighting instructions for each appliance being in-
spected. Adjust thermostat so appliance(s) will operate
continuously.

Allow 5 minutes of main burner operation, then check for
spillage at the draft hood relief opening of each appliance.

Use the flame of a match or candle (Figure 5).

5. When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, as-

sume a 20% free area for wood and 60% for metal.

Confined SpaceInstallation

NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH input rating for all gas appliances

installed in the area.

Requirements

1. Provide confined space with sufficient air for proper com-
bustion and ventilation of flue gases using horizontal or
vertical ducts or openings.

44001 101004

3.

4.

Figure 6 illustrate how to provide combustion and ventila-

tion air. A minimum of two permanent openings, one inlet
and one outlet, are required.

One opening MUST be within 12" of the floor and the se-

cond opening within 12" of the ceiling.

Size openings and ducts per Table 1.

5. Horizontal duct openings require 1" square offree area per
2,000 BTUH of combined input for all gas appliances in

area (see Table 1).

6. Vertical duct openings or openings directly to outside re-
quire 1" square of free area per 4,000 BTUH for combined

input of all gas appliances in area (see Table 1).

Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)

ThisinstallationNOTapprovedinCanada

GableVent_b.J

- OptionalInlet Air (t)

I II I -- I

_Air (t)

wate_

SoffitVent

Gable Vent

Air (t)

Inlet

Air (t]

Soffit Vent

MinimumOneInlet and One OutletAir Supply is Required

May beinandCombinationShown

InletAir OpeningMust be Within12"offloor

OutletAir OpeningMustbeWithin12" of ceiling
(t) t SquareInch per4000 BTUH
(2)t SquareInch per2000 BTUH

Inlet

Air(t)

Inlet

Air (2)

MinimumFree Area Requiredfor Each Opening

BTUH

input HorizontalDuct

Rating (2,000BTUH)

50,000 25 sq.in.
75,000 37.5sq. in.

100,000 50sq.in.
125,000 62.5sq. in.
150,000 75sq. in.

VerticalDuctoropenings Round

to outside Duct

(4,000BTUH) (4,000

BTUH)

12.5sq.in. 4"

18.75sq. in. 5"
25sq. in. 6"

31.25sq, in. 7"

37.5sq. in. 7"

EXAMPLE: Determining Free Area
Appliance 1 Appliance 2 Total Input

100,000 + 30,000 = (130,000 + 4,000) = 32.5 Sq. In. Vertical

Appliance 1 Appliance 2 Total Input

100,000 + 30,000 = (130,000 + 2,000) = 65 Sq. In. Horizontal

One permanent opening, commencing within 12" of the top of the
enclosure, shall be permitted where the equipment has clear-

ances of at least 1" from the sides and back and 6" from the front
of the appliance. The opening shall directly communicate with the

outdoors or shall communicate through a vertical or horizontal
duct to the outdoors or spaces (crawl or attic) that freely communi-
cate with the outdoors, and shall have a minimum free area of:

• 1sq. in per 3000 Btu per hr. of the total input rating of all
equipment located in the enclosure, and

• Not less than the sum of the areas of all vent connectors
in the confined space.

UnconfinedSpaceInstallation

Poison carbon monoxide gas Hazard,
Most homes will require additional air.

An unconfined space or homes with tight

construction may not have adequate air
infiltration for proper combustion and ventilation

of flue gases.
Failure to supply additional air by means of

ventilation grilles or ducts could result in death

and/or personal injury.

BTUH Input

Rating

50,000

78,000

114,000

155,000

An unconfined space is defined as an area having a minimum vol-
ume of 50 cubic feet per 1,000 Btuh total input rating for all gas

appliances in area. Refer to Table 2 for minimum area required.

I Unconfined Space

Minimum Area in Square Feet

Minimum Area in Square Feet

312
490

712
968

EXAMPLE: NOTE: Square feet is based on 8 foot ceilings,

28,000BTUH X 50CubicFt. = 1,400 = 175Sq. Ft.

1,000 8' Ceiling Height

44001 101004

NOTE:Referto definitionsin sectiontitledUnusually Tight

Construction. If any one of the conditions apply, the space MUST
be considered confined space regardless of size.

1. Adjoining rooms can be considered part of an unconfined
area if there are openings without doors between rooms.

2. An attic or crawl space may be considered an unconfined
space provided there are adequate ventilation openings di-

rectly to outdoors. Openings MUST remain open and NOT
have any means of being closed off. Ventilation openings to

outdoors MUST be at least 1" square of free area per 4,000

BTUH of total input rating for all gas appliances in area.

3. Install air intake a minimum of 12" above maximum snow

level and clear of any obstruction. Duct or ventilation open-
ing requires one square inch of free area per 4,000 BTUH

of total input rating for all gas appliances in area.

4. Air inlet MUST be screened with not less than 1/4" mesh
screen.

UnusuallyTight Construction

In unconfined spaces, infiltration may be adequate to provide air

for combustion, ventilation and dilution of flue gases. However, in

buildings with unusually tight construction, additional air MUST
be provided using the methods described in section titled Con-

fined Space Installation:

Unusually tight construction is defined as: Construction with

2.

3.

Walls and ceilings exposed to the outside have a continu-
ous, sealed vapor barrier. Openings are gasketed or

sealed and

Doors and openable windows are weather stripped and

Other openings are caulked or sealed. These include joints
around window and door frames, between sole plates and

floors, between wall-ceiling joints, between wall panels, at
penetrations for plumbing, electrical and gas lines, etc.

VentilationAir

Some provincial codes and local municipalities require ventilation
or make-up air be brought into the conditioned space as replace-
ment air. Whichever method is used, the mixed return air temper-

ature across the heat exchanger MUST not fall below 60 °F or flue
gases will condense in the heat exchanger. This will shorten the
life of the heat exchanger and possibly void your warranty.

4. Vent and Combustion Air Piping

Poison carbon monoxide gas, fire and explo-
sion hazard,

Contaminated Combustion Air

Read and follow all instructions in this section,

Failure to properly vent this furnace can result in
death, personal injury and/or property damage.

Installations in certain areas or types of structures will increase

the exposure to chemicals or halogens that may harm the fur-
nace.

The following areas or types of structures may contain or have ex-
posure to the substances listed below. The installation must be

evaluated carefully as it may be necessary to provide outside air
for combustion.

SinglePipe(NgMP1Models)

This furnace is certified as a category IV appliance. This furnace

requires ventilation openings to provide air for proper combustion

and ventilation of flue gases. All duct or openings for supplying
combustion and ventilation air must comply with the gas codes or

in absence of local codes, the applicable national codes.

When the installation is complete, see the "Venting and Com-
bustion Air Check" in this manual.

DirectVent(NgMP2Models)

This furnace is certified as a category IV appliance. This furnace
uses outside air for combustion ONLY, it MUST be taken from the

same atmospheric pressure zone as the vent pipe. See Con-

fined Space Installation in the Combustion and Ventilation

Air in this manual.

DualCertified (*9MPDModels)

This furnace is certified as a category IV appliance. This furnace
can be installed as a direct vent furnace using outside air for com-

bustion or the furnace can use air from inside the structure for
combustion. The INLET air pipe is optional. If combustion air

comes from inside the structure, adequate make up air MUST be

• Commercial buildings.

• Buildings with indoor pools.

• Furnaces installed in laundry rooms.

• Furnaces installed in hobby or craft rooms.

• Furnaces installed near chemical storage areas.

• Permanent wave solutions for hair.

• Chlorinated waxes and cleaners.

• Chlorine based swimming pool chemicals.

• Water softening chemicals.

• De-icing salts or chemicals.

• Carbon tetrach!oride.

• Halogen type refrigerants.

• Cleaning solvents (such as perch!oroethylene).

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid.

• Sulfuric Acid.

• Solvent cements and glues.

• Antistatic fabric softeners for clothes dryers.

• Masonry acid washing materials.

provided to compensate for oxygen burned. See Confined
Space Installation in the Combustion and Ventilation Air

chapter, if combustion air is drawn from outside the structure, it

MUST be taken from the same atmospheric pressure zone as the

vent pipe.

Ventand Combustion Air PipingGuidelines

NOTE: All vent piping MUST be installed in compliance with local

codes or ordinances, these instructions, good trade practices,
and codes of country having jurisdiction.

44001 101004

1. Determinethebestroutingandterminationforthevent
pipeandairinletpipebyreferringtoalloftheinstructions

andguidelinesinthisSection.

2. Determinethesizerequiredfortheventpipeandairinlet
pipe.

3. Looselyassembleallventingpartswithoutadhesive(pipe

jointcement)forcorrectfitbeforefinalassembly.

4. Useofverticalpipingispreferredbecausetherewillbe

somemoistureinthefluegasesthatmaycondenseasit

leavestheventpipe(SeeSpecial Instruction For Horizon-

tal Vents).

5. The vertical vent pipe MUST be supported so that no

weight is allowed to rest on the combustion blower.

6. Exhaust vent piping or air inlet piping diameter MUST NOT
be reduced.

7.

All exhaust vent piping from the furnace to termination

MUST slope upwards. A minimum of 1/4" per foot of run is
required to properly return condensate to the furnace drain

system.

8. Use DWV type long radius elbows whenever possible, as

they provide for the minimum slope on horizontal runs and
they provide less resistance in the vent system. If DWV el-

bows cannot be used, use two, 45 ° elbows when possible.
On horizontal runs the elbows can be slightly misaligned to
provide the correct slope.

9. All horizontal pipe runs MUST be supported at least every

five feet with galvanized strap or other rust resistant materi-
al. NO sags or dips are permitted.

10. All vertical pipe runs MUST be supported every six feet
where accessible.

11. The minimum pipe run length is 2'.

12. The piping can be run in the same chase or adjacent to sup-

ply or vent pipe for water supply or waste plumbing. It can

also be run in the same chase with a vent from another 90+
furnace.

NOTE: In NO case can the piping be run in a chase where
temperatures can exceed 140 ° R or where radiated heat
from adjacent surfaces would exceed 140 ° F.

13. The vent outlet MUST be installed to terminate in the same
atmospheric pressure zone as the combustion air inlet.

14. The vent system can be installed in an existing unused
chimney provided that:

• Both the exhaust vent and air intake run the length ofthe
chimney.

• No other gas fired appliance or fireplace (solid fuel) is
vented into the chimney.

• The top of the chimney MUST be sealed flush or
crowned up to seal against rain or melting snow so ONLY
the piping protrudes,

• The termination clearances shown in Figure 7 are main-
tained.

15. Furnace applications with vertical vents requiring vent di-
ameter increaser fittings must have increaser fittings

installed in vertical portion of the vent. Condensate will be

trapped in the vent if the vent diameter is increased prior to
having an elbow turned upward. This could cause nui-

sance tripping of the pressure switch.

PipingInsulation Guidelines

NOTE: Use closed cell, neoprene insulation or equivalent. If Fi-
berglass or equivalent insulation is used it must have a vapor bar-

rier. Use R values of 7 up to 10', R- 11 if exposure exceeds 10'. If

Fiberglass insulation is used, exterior to the structure, the pipe

MUST be boxed in and sealed against moisture.

1. When the vent or combustion air pipe height above the roof
exceeds 30", or if an exterior vertical riser is used on a hori-

zontal vent to get above snow levels, the exterior portion

MUST be insulated.

2. When combustion air inlet piping is installed above a sus-
pended ceiling, the pipe MUST be insulated with moisture

resistant insulation such as Armaflex or other equivalent

type of insulation.

3. Insulate combustion air inlet piping when run in warm, hu-
mid spaces such as basements.

Sizing Combustion Air and VentPipe

Consult Table 3 or Table 4 to select the proper diameter exhaust
and combustion air piping. Exhaust and combustion air piping is
sized for each furnace Btuh size based on total lineal vent length

(on inlet or outlet side), and number of 90 ° elbows required.

1. Double Pipe Installation-If installing as a direct-vent ap-
pliance, consult Table 4 to select the proper diameter ex-
haust and combustion air piping. Exhaust and combustion

air piping is sized for each furnace Btuh size based on total

lineal vent length (on inlet or outlet side), and number of 90 °

elbows required.

2. Single Pipe Installation-if installing as a non-direct vent
appliance, (single outlet pipe and no inlet pipe) refer to

Table 3. The table shows the maximum number of elbows
allowed with any given pipe diameter and length of run.

3. Use of Elbows-Two 45 ° elbows can be substituted for one
90 ° elbow. The elbow or elbows used for vent termination

outside the structure ARE counted, including elbows need-
ed to bring termination above expected snow levels.

Pipe Diameter Table

Single Piping ONLY

50,000 & 75,000 Btuh Furnaces

40' & (5) 90° elbows with 2" PVC pipe or

70' & (5) 90 ° elbows with 3" PVC pipe

100,000 Btuh Furnace

70' & (5) 90 ° elbows with 3" PVC pipe

125,000 Btuh Furnace

40' & (5) 90 ° elbows with 3" PVC pipe

Elbows are DWV Long Radius Type for 2" and 3" vents.

If more than five elbows are required, reduce the length of
both the inlet and exhaust pipes 5' for each additional elbow

used.
NOTE: It is allowable to use larger diameter pipe and fitting than

shown in the tables but not smaller diameters than shown.

44001 101004 [_1

Pipe Diameter Table

Dual Piping ONLY

50,000 & 75,000 Btuh Furnaces

40' & (5) 90 ° elbows with 2" PVC pipe or

70' & (5) 90 ° elbows with 3" PVC pipe

100,000 Btuh Furnace

70' & (5) 90 ° elbows with 3" PVC pipe

125,000 Btuh Furnace

40' & (5) 90 ° elbows with 3" PVC pipe

Elbows are DWV Long Radius Type for 2" and 3" vents.

If more than five elbows are required, reduce the length of
both the inlet and exhaust pipes 5' for each additional elbow

used.

For "Concentric Termination Kit" Venting table, see
"Section 10" in this manual.

VentTermination Clearances

Poison carbon monoxide gas, fire and explo-
sion hazard.

Inlet and outlet pipes may NOT be vented
directly above each other.

Failure to properly vent this furnace can result in
death, personal injury and/or property damage.

1. Determinetermination locations based on clearances spe-
cified in following steps and as shown in Figure 7,

Figure 17, through Figure 25.

For "Concentric Termination Kit" clearances, see Figure 43,
Figure 44, Figure 45, Figure 46and Figure 47 in "Section 10"

in this manual.

2. The vent termination must be located at least 12" above
ground or normally expected snow accumulation levels.

3. Do NOT terminate over public walkways. Avoid areas
where condensate may cause problems such as above

planters, patios, or adjacent to windows where steam may

cause fogging.

4. The venttermination shall be located at least 4' horizontally
from any electric meter, gas meter, regulator, and any relief
equipment. These distances apply ONLY to U.S. installa-

tions.
The vent termination is to be located at least 3' above any

forced air inlet located within 10' ; and at least 10' from a
combustion air intake of another appliance, except another

direct vent furnace intake.

6. In Canada, the Canadian Fuel Gas Code takes prece-
dence over the preceding termination instructions.

Vent Termination Clearances
(United States Only)

OtherThan

OtherThan

DirectVeflt

Terminal

DirectVent

Terminal

50,000Btuh

oriess

OtherThatl

DirectVent ForcedAir

Terminal 12" Inlet

DirectVentTerminal

10-1t-36

More Than 50,000 Btuh

CondensateDrainTrap

This furnace removes both sensible and latent heat from the prod-
ucts of combustion. Removal of the latent heat results in con-

densation of the water vapor. The condensate is removed from
the furnace through the drains in the plastic transition and the vent

fitting. The drains connect to the externally mounted condensate
drain trap on the left or right side of the furnace.

The condensate drain trap supplied with the furnace MUST be
used. The drain line between the condensate drain trap and the

3 ,

drain location may be constructed of /4' PVC, CPVC pipe or suit-
able material.

The drain line must maintain a 1/4" per foot downward slope to-
ward the drain.

DO NOT trap the drain line in any other location than at the con-

densate drain trap supplied with the furnace.

Frozen water pipe hazard.
When activated an auxiliary safety switch will

cause a furnace not to operate.
During freezing temperatures the water pipes in

your home could freeze and burst causing water
damage to the home.

Do not leave the home unattended during freezing
temperatures, or shut off the water supply and

drain the pipes before leaving.

If possible DO NOT route the drain line where it may freeze. The
drain line must terminate at an inside drain to prevent freezing of
the condensate and possible property damage.

1. A condensate sump pump MUST be used if required by lo-
cal codes, or if no indoor floor drain is available. The con-

densate pump must be approved for use with acidic
condensate.

[_ 44001 101004

2. Apluggedcondensatedrainlineorafailedcondensate
pumpwillallowcondensateto spill.If thefurnaceis

installedwhereacondensatespillcouldcausedamage,it
isrecommendedthatanauxiliarysafetyswitchbeinstalled

topreventoperationoftheequipmentintheeventofpump
failureorpluggeddrainline.Ifused,anauxiliarysafety
switchshouldbeinstalledintheRcircuit(lowvoltage)

ONLY.

CondensateDrainTrapFreezeProtection

Special precautions MUST be made if installing furnace in an

area which may drop below freezing. This can cause improper op-
eration or damage to the equipment. If the the furnace environ-

ment has the potential of freezing, the drain trap and drain line
must be protected. Use 3 to 6 watt per foot at 115 volt, 40 ° F self-

regulating shielded and waterproof heat tape. Wrap the drain trap
and drain line with the heat tape and secure with the ties. Follow
the heat tape manufacturer's recommendations.

Upflow Installations (Dual Certified *9MPD Models)

LEFT Side Venting

Supply Air _ Vent Pipe

Vent Pipe

Vent Fittin,

Gas Pipe

90 ° Elbow

Rubber Coupling
&Clamps

5/8

Clamps

Combustion

Blower

Plastic

CondensateTrap _
& Gasket

(Left or Right Side)

Drain Line

Plug

3/4" Hose Combustion
& Clamps Blower

Mounting

Screws (4)

25-23-53

Pipe (optional)

lSupply Air

Coupling

Plastic Caps

Pressure Switch

Blower

Pressure Switch

Transition

Pressure Switch,

Transition

Box Vent Drain

Pressure Switch,

Transition

DRAIN SIDE VIEW _

:lamp

Rigid Plastic
Drain Tube

UpflowInstallations- (Dual Certified*9MPD) (See Figure8)

Mount the condensate drain trap in a vertical position to either the

left or right side of the furnace using the two screws and gasket
that are provided. If needed, remove the hole plugs from the fur-
nace side panel and relocate to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using

the condensate trap as the template.

Ensure that the vent fitting and the 90 ° elbow is securely attached
to the combustion blower using the rubber coupling and clamps.

Plug the right drain stub of the vent fitting with the rubber plug. Use
a blunt pointed screwdriver to push the plug into the stub.

For left side venting, remove vent fitting assembly from combus-
tion blower. Remove 90 ° elbow and rubber tubing from the vent
fitting by loosening the clamp on the vent fitting. Securely attach
vent fitting to combustion blower.

44001 101004

NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20 ° to
30 ° downward slope.

This configuration allows left side venting from the furnace. If right
sideventing is required, the combustion blower must be relocated

on the plastic transition box. Remove the four(4) screws that se-
cure the blower to the transition. Rotate the blower 180 ° and se-

cure with the four(4) screws. Use caution to not over tighten the
screws to prevent stripping out of the plastic mounting holes.

Plug the upper drain stub on the vent fitting with the rubber plug.

Use a blunt pointed screwdriver to push the plug into the stub.

Route the hose to the large drain stub on the condensate trap. Cut

off excess hose and discard. Connect the hose with the 90 ° bend
to the drain stub on the trap and secure with a 3/4" clamp.

For left side mounted condensate trap, connect the 3/4" OD rub-

ber hose to the drain stub on the bottom of the plastic transition
box and secure with a 3/4" clamp.

For right side mounted condensate trap, the rigid plastic drain
tube MUST be used, Cut two 2" long sections from the 3/4" OD

rubber hose, Connect the plastic drain tube to the drain stub on
the bottom of the plastic transition box and to the stub on the con-
densate trap using the two hose sections and 3/4" clamps.

Route the hose to the small drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 5/8" clamp.

NOTE: The support leg on the plastic drain tube MUST be posi-
tioned on the blower partition.

Connect the 5/8" OD rubber hose with the 90 ° bend to the left
drain stub on the vent fitting and secure with a 5/8" clamp.

NOTE: Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drain-

age.

Horizontal Left Installations (Dual Certified *9MPD)

Transition Box

Air Intake Combustion Air Pipe, (optional)

ly =

J_

x

LU

Vent Fitting

Elbow

Preasure Switch Hose,
Blower

Preaaure Switch,

Blower Pressure Switch,

_ Transition

Combustion

Combustion Blower

Mounting Screws

(4)

Transition

3/4" Hose & Clamps

Return

Air

Vent Pipe
Grommet

DRAIN SIDE VIEW

Gas Pipe
Grommet

Trap & Gasket

5/8" Hose & Clamps

Rotatedownward Rubber Coupling
20° to30° & Clamps

dwg 25-23-54

HorizontalLeftInstallations- (Dual Certified*9MPD) (See Figure 9)

Relocate the plastic caps and clamps on the condensate drain
trap from the vertical drain stub to the horizontal drain stubs. Se-
cure the clamps tightly to prevent condensate leakage,

Mount the condensate drain trap in a vertical position to the left
side of the furnace using the two screws and gasket that are pro-
vided. Note: The condensate trap will be located under the fur-
nace in a vertical position when the furnace is placed horizontally

on the left side. If needed, remove the hole plugs from the furnace
side panel and relocate to the open set of holes in the opposite
side panel. Drill two 7/64" diameter holes in the casing using the

condensate trap as the template.

Connect the vent fitting and the 90 ° elbow to the combustion blow-
er using the rubber coupling and clamps.

Plug the upper drain stub on the vent fitting with the rubber plug.

Use a blunt pointed screwdriver to push the plug into the stub.
Connect the 3/4" OD rubber hose with the 90 ° bend to the drain

stub on the bottom of the plastic transition box and secure with a
3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut

oft excess hose and discard. Connect the hose to the drain stub
on the trap and secure with a 3/4" clamp.

Connect the 5/8" OD rubber hose with the 90 ° bend to the small
drain stub on the trap and secure with a 5/8" clamp.

Route the hose to the lower drain stub on the vent fitting. Cut oft

excess hose and discard. Connect the hose to the drain stub on
the vent fitting and secure with a 5/8" clamp.

NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20 to
30° downward slope.

NOTE: Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drain-

age.

[_ 44001 101004

Return

Air

Horizontal Right Installations (Dual Certified *9MPD)

Rubber Coupling & Clamps 90° Elbow

Plastic Caps

5/8" Hose & Clamps

Combustion

Blower

Vent Fitting

Combustion Blower
Mounting

Screws (4)

Pressure Switch
Hose, Transition

Pressure Switch, Transition

i r

Combustion
Air Pipe

_(Optional)

Supply I

Air

/

Air Intake
Coupling

Plastic Caps

Condensate Trap
& Gasket

Drain Line

Pressure Switch, Hose, Blower ;IDE VIEW
Blower

3/4" Hose & Clamps

Rotatedownward
20° to30°

dwg25-23-55

HorizontalRight Installations- (DualCertified

Relocate the plastic caps and clamps on the condensate drain
trap from the vertical drain stub to the horizontal drain stubs. Se-

cure the clamps tightly to prevent condensate leakage.

*9MPD)(See Figure 10)

Relocate the plastic caps on the stubs of the plastic transition box

from the lower stubs to the upper stubs and secure tightly with the
clamps.

Mount the condensate drain trap in a vertical position to the right
side of the furnace using the two screws and gasket that are pro-

vided. Note: The condensate trap will be located under the fur-
nace in a vertical position when the furnace is placed horizontally

on the right side. If needed, remove the hole plugs from the fur-
nace side panel and relocated to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using
the condensate trap as the template.

Route the pressure switch hose to the lower stub on the plastic

transition box. Cut off excess hose and discard. Connect the pres-
sure switch hose to the lower stub on the plastic transition box.

NOTE: Failure to correctly install the pressure switch hose to the
transition can adversely affect the safety control operation.

Connect the 3/4" OD rubber hose with the 90 ° bend to the drain
stub on the bottom of the plastic transition box and secure with a

3/4" clamp.

Connect the vent fitting and the 90 ° elbow to the combustion blow-
er using the rubber coupling and clamps.

Route the hose to the large drain stub on the condensate trap. Cut

off excess hose and discard. Connect the hose to the drain stub
on the trap and secure with a 3/4" clamp.

NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20 ° to

30 ° downward slope.

Plug the upper drain stub on the vent fitting with the rubber plug.

Use a blunt pointed screwdriver to push the plug into the stub.

Remove the pressure switch hose from the upper stub on the
plastic transition box,

Connect the 5/8" OD rubber hose with the 90 ° bend to the lower
drain stub on the vent fitting and secure with a 5/8" clamp.

Route the hose to the smaller drain stub on the condensate trap.

Cut off excess hose and discard. Connect the hose to the drain
stub on the trap and secure with a 5/8" clamp.

NOTE: Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drain-

age.

44001 101004 [_

Downflow Installations (Dual Certified *gMPD Models)

LEFT Side Venting_

"4C>

Return Air

Combustion Blower

Mounting Screws (4)

Supply Air

Pressure Switch,
Transition

Pressure Switch
Hose, Transition _

Blower

Pressure Switch
Hose,

3/4

& Clamps

5/8°
Clamps

RIGHT Side Venting

<z>

Return Air

Combustion Blower
0

Transition

Box

Supply Air

Air Intake
Coupling

Combustion

Air Pipe, (Optional)

Vent Pipe

__e_ltFittin g

mps

Vent Pipe
Grommet

Caps

Condensate

Trap & Gasket

pe

Grommet

Drain Line

dwg 25-23-56

Downfl0wInstallations- (DualCertified*9MPDModels)(See Figure 11)

Mount the condensate drain trap in a vertical position to either the

right or left side of the furnace using the two screws and gasket
that are provided. If needed, remove the hole plugs from the fur-

nace side panel and relocated to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using

the condensate trap as the template.

Ensure that the vent fitting and the 90 ° elbow is securely attached
to the combustion blower using the rubber coupling and clamps.

This configuration allows right side venting from the furnace. Ifthe

left side venting is required, the combustion blower must be relo-
cated on the plastic transition box. Remove the four(4) screws

that secure the blower to the transition. Rotate the blower 180 °
and secure with the four(4) screws. Use caution to not over tight-

en the screws to prevent stripping out of the plastic mounting
holes.

For right side venting, remove vent fitting assembly from combus-
tion blower. Remove 90° elbow and rubber tubing from the vent

fitting by loosening the clamp on the vent fitting. Securely attach
vent fitting to combustion blower.

NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20 ° to
30° downward slope.

Plug the upper drain stub of the vent fitting with the rubber plug.

Use a blunt pointed screwdriver to push the plug into the stub.

Remove the pressure switch hose from the upper stub on the

plastic transition box.

Relocate the plastic caps on the stubs of the plastic transition box
from the lower stubs to the upper stubs and secure tightly with the
clamps.

Route the pressure switch hose to the lower stub on the plastic
transition box. Cut off excess hose and discard. Connect the pres-
sure switch hose to the lower stub on the plastic transition box.

NOTE: Failure to correctly install the pressure switch hose to the
transition box can adversely affect the safety control operation.

Connect the 3/4" OD rubber hose with the 90 ° bend to the drain
stub on the bottom of the plastic transition box and secure with a

3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 3/4" clamp.
Connect the 5/8" OD rubber hose with the 90 ° bend to the left

drain stub on the vent fitting and secure with a 5/8" clamp.

Route the hose to the smaller stub on the condensate trap. Cut off
excess hose and discard. Connect the hose to the drain stub on

the trap and secure with a 5/8" clamp.
NOTE: Ensure hoses maintain a downward slope to the conden-

sate trap with no kinking or binding for proper condensate drain-
age.

[_ 44001 101004

Vent Fitting
& Clamps

5/8" Hose & Clamps --

Plastic

Caps

Condensate
Trap & Gasket

LEFT Side Venting

Supply Air

Upflow Installations (Single Pipe & Direct Vent NgMP1 & NgMP2 Models)

RIGHT Side Venting

Combustion

/ Air Pipe, /1

NgMP2ONLY _ Supply Air _

Rubbe_

P,ug

Transition Box

Plastic
Caps

Combustion Blower

180° for

Left Side)

Pressure Hose,
Blower

Pressure Switch,
Blower

Pressure Switch
Hose, Transition

Pressure Switch,
Transition

DRAIN SIDE VIEW

_ ombustion

Air Pipe,
NgMP2 ONLY

Combustion

Blower
Mounting

3/4" Hose & Clamps

dwg 25-23-57

Upfl0wInstallations-

Mount the condensate drain trap in a vertical position to either the
left or right side of the furnace using the two screws and gasket

that are provided. If needed, remove the hole plugs from the fur-
nace side panel and relocate to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using

the condensate trap as the template.

(Single Pipe &Direct Vent NgMP1& NgMP2 Models) (See Figure 12)

For left side mounted condensate trap, connect the 3/4" OD rub-
ber hose with the 90 ° bend to the drain stub on the bottom of the

plastic transition box and secure with a 3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 8/4" clamp.

Ensure that the vent fitting and the 90 ° elbow is securely attached

to the combustion blower using the rubber coupling and clamps.

NOTE: The vent fitting MUST be installed with the airflow marking

arrow pointed toward the vent pipe, with the drain stub at a 20 ° to
30 ° downward slope.

This configuration allows left side venting from the furnace. If right
side venting is required, the combustion blower must be relocated
on the plastic transition box. Remove the four(4) screws that se-

cure the blower to the transition. Rotate the blower 180 ° and se-
cure with the four(4) screws. Use caution to not over tighten the

screws to prevent stripping out of the plastic mounting holes.

Plug the upper drain stub of the vent fitting with the rubber plug.
Use a blunt pointed screwdriver to push the plug into the stub.

For right side mounted condensate trap, the rigid plastic drain
tube MUST be used. Cut two 2" long sections from the 3/4" OD

rubber hose. Connect the plastic drain tube to the drain stub on
the bottom of the plastic transition box and to the stub on the con-
densate trap using the two hose sections and 8/4" clamps.

NOTE: The support leg on the plastic drain tube MUST be posi-
tioned on the blower partition.

Connect the 5/8" OD rubber hose with the 90 ° bend to the lower
drain stub on the vent fitting and secure with a 5/8" clamp.

Route the hose to the smaller drain stub on the condensate trap.
Cut off excess hose and discard. Connect the hose to the drain

stub on the trap and secure with a 5/8" clamp.
NOTE: Ensure hoses maintain a downward slope to the conden-

sate trap with no kinking or binding for proper condensate drain-
age.

44001 101004 [_

Horizontal Left Installations (Single Pipe & Direct Vent NgMP1 & NgMP2 Models)

Plastic
Caps

Pressure Switch,
Blower Rubber

Plug

Transition

Grommet

Pressure Switch

Transition
Pressure Switch,

Supply

Air

?_> Inlet

/

Combustion

Air Pipe,

NgMP2ONLY

Vent Fitting

& Clamps

Pressure Switch
Hose, Blower

Combustion Blower

5/8" Hose &
Clamps

Return

Air

Combustion Blower
(Rotate 180 ° for Right Side)

3/4" Hose
& Clamps

Condensate
Trap & Gasket

Caps

dwg 25-23-58

HorizontalLeft Installations- (SinglePipe& DirectVentN9MP1& N9MP2 Models)(See Figure 13)

Relocate the plastic caps and clamps on the condensate drain

trap from the vertical drain stubs to the horizontal drain stubs. Se-
cure the clamps tightly to prevent condensate leakage.

Mount the condensate drain trap in a vertical position to the left

side of the furnace using the two screws and gasket that are pro-
vided. Note: The condensate trap will be located under the fur-
nace in a vertical position when the furnace is placed horizontally

on the left side. If needed, remove the hole plugs from the furnace
side panel and relocated to the open set of holes in the opposite
side panel. Drill two 7/64" diameter holes in the casing using the
condensate trap as the template.

Relocate the combustion blower on the plastic transition box. Re-

move the four(4) screws that secure the blower to the transition
box. Rotate the blower 180 ° so the blower snout is pointing up and
secure with the four(4) screws. Use caution to not over tighten the

screws to prevent stripping out of the plastic mounting holes.

Ensure that the vent fitting and the 90 ° elbow is securely attached

to the combustion blower using the rubber coupling and clamps.

NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20° to

30 ° downward slope.

Plug the left drain stub on the vent fitting with the rubber plug. Use
a blunt pointed screwdriver to push the plug into the stub.

Connect the 3/4" OD rubber hose with the 90° bend to the drain
stub on the bottom of the plastic transition box and secure with a

3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 3/4" clamp.
Connect the 5/8" OD rubber hose with the 90° bend to the right

drain stub on the vent fitting and secure with a 5/8"clamp.

Route the hose to the smaller drain stub on the condensate trap.
Cut off excess hose and discard. Connect the hose to the drain

stub on the vent fitting and secure with a 5/8" clamp.
NOTE: Ensure hoses maintain a downward slope to the conden-

sate trap with no kinking or binding for proper condensate drain-
age.

[_1 44001 101004

Horizontal Right Installations (Single Pipe & Direct Vent N9MP1 & N9MP2 Models)

Transition Box Vent Pipe

Caps Vent Fitting Combustion

Air Pipe,
NgMP2ONLY

Return

Air

5/8" Hose &
Clamps _

Mounting Screws (4)

PressureSwitch _ Supply
Hose, Blower Air

J

Plastic 3/4" Hose
Caps Pressure Hose, Transition & Clamps

Switch, Transition

Condensate
Trap & Gasket

Drain Line

Pressure
Switch, Blower

dwg 25-23-59

HorizontalRight Installations- (SinglePipe&

Figure14)

Relocate the plastic caps and clamps on the condensate drain

trap from the vertical drain stub to the horizontal drain stubs. Se-
cure the clamps tightly to prevent condensate leakage.

Mount the condensate drain trap in a vertical position to the right

side of the furnace using the two screws and gasket that are pro-
vided. Note: The condensate trap will be located under the fur-

nace in a vertical position when the furnace is placed horizontally
on the right side. If needed, remove the hole plugs from the fur-

nace side panel and relocate to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using
the condensate trap as the template.

Ensure that the vent fitting and the 90 ° elbow is securely attached

to the combustion blower using the rubber coupling and clamps.

NOTE: The vent fitting MUST be installed with the airflow marking

arrow pointed toward the vent pipe.

Plug the left drain stub on the vent fitting with the rubber plug. Use

a blunt pointed screwdriver to push the plug into the stub.

Remove the pressure switch hose from the upper stub on the

plastic transition box.

Relocate the plastic caps on the stubs of the plastic transition from

the lower stubs to the upper stubs and secure tightly with the
clamps.

DirectVent NgMP1& NgMP2Models)(See

Route the hose to the large drain stub on the condensate trap. Cut
oft excess hose and discard. Connect the pressure switch hose

to the lower stub on the plastic transition box. NOTE: Failure to
correctly install the pressure switch hose to the transition can ad-

versely affect the safety control operation.

Connect the 3/4" OD rubber hose with the 90 ° bend to the drain
stub on the bottom of the plastic transition box and secure with a

3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut
oft excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 3/4" clamp.

Connect the 5/8" OD rubber hose with the 90 ° bend to the right s-
tub on the vent fitting and secure with a 5/8" clamp.

Route the hose to the smaller drain stub on the condensate trap.
Cut oft excess hose and discard. Connect the hose to the drain

stub on the trap and secure with a 5/8" clamp.

NOTE: Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drain-

age.

44001 101004 [_

Downflow Installations (Single Pipe & Direct Vent NBMP1 & NBMP2 Models)

Vent Fitting
& Clamps

5/8" Hose &

Plastic Caps

Trap & Gasket

Drain Line

LEFT Side Venting RIGHT Side Venting

<z> <Z>

Return Air

Return Air

Combustion Blower
Mounting Screws (4)

Hose & Clamps

Supply Air

Pressure Switch
Hose, Transition

Plastic

Transition Box

Pressure
Switch, Blowe_rr

Pressure Switch
Hose, Blower

Combustion Blower
(Rotate 180° for Left Side)

Pressure
Switch,

Transition

Supply Air

dwg

Vent Pipe

Grommet

Combustion

NBMP2 ONLY

DRAIN SIDE VIEW

Rotate
downward

20° to 30°

D0wnfl0wInstallations- (Single Pipe& Direct

Mount the condensate drain trap in a vertical position to either the
right or left side of the furnace using the two screws and gasket

that are provided. If needed, remove the hole plugs from the fur-
nace side panel and relocated to the open set of holes in the oppo-

site side panel. Drill two 7/64" diameter holes in the casing using
the condensate trap as the template.

Ensure that the vent fitting and the 90 ° elbow is securely attached

to the combustion blower using the rubber coupling and clamps.

NOTE: The vent fitting MUST be installed with the airflow marking

arrow pointed toward the vent pipe, with the drain stub at a 20 ° to
30 ° downward slope.

This configuration allows right side venting from the furnace. Ifthe

left side venting is required, the combustion blower must be relo-

cated on the plastic transition box. Remove the four(4) screws
that secure the blower transition box. Rotate the blower 180 ° and

secure with the four(4) screws. Use caution to not over tighten the
screws to prevent stripping out of the plastic mounting holes.

Plug the upper drain stub on the vent fitting with the rubber plug.
Use a blunt pointed screwdriver to push the plug into the stub.

Remove the pressure switch hose from the upper stub on the

plastic transition.

VentN9MP1& N9MP2 Models)(See Figure 15)

Relocate the plastic caps on the stubs of the plastic transition box
from the lower stubs to the upper stubs and secure tightly with the

clamps.

Route the pressure switch hose to the lower drain stub on the
plastic transition box. Cut off excess hose and discard. Connect

the pressure switch hose to the lower stub on the plastic transition
box.

NOTE: Failure to correctly install the pressure switch hose to the
transition can adversely affect the safety control operation.

Connect the 3/4" OD rubber hose with the 90 ° bend to the drain
stub on the bottom of the plastic transition box and secure with a

3/4" clamp.

Route the hose to the large drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub

on the trap and secure with a 3/4" clamp.
Connect the 5/8" OD rubber hose with the 90 ° bend to the lower

stub on the vent fitting and secure with a 3/4" clamp.

Route the hose to the smaller stub on the condensate trap. Cut off
excess hose and discard. Connect the hose to the drain stub on

the trap and secure with a 5/8" clamp.
NOTE: Ensure hoses maintain a downward slope to the conden-

sate trap with no kinking or binding for proper condensate drain-
age.

[_ 44001 101004

ConnectingVentand CombustionAir Piping

Poison carbon monoxide gas hazard.
Cement or mechanically seal all joints, fittings,

etc. to prevent leakage of flue gases.
Failure to properly seal vent piping can result in

death, personal injury and/or property damage.

Refer to the Figure 8 through Figure 15 that corresponds to the
installation position of the furnace for the application.

Preassemble the vent and combustion air piping from the furnace
to the vent termination. Do not cement the pipe joints until the pipe
preassembly process is complete.

CombustionAir Pipe Connection (Dual Certified or

Direct Vent)

install the air intake coupling and gasket to the furnace with the
four(4) screws. (See Figure 8 through Figure 15)

Note: For the upflow and horizontal installations, the air intake
coupling and gasket must be installed to the top panel of the fur-

nace.

For downflowinstallation, the air intake coupling and gasket must

be installed to the alternate air intake location on either the left or

right side panels. Remove the 3" hole plug from the side panel
and relocate to the air intake hole in the top panel. Use the four
screws to seal the four(4) mounting holes in the top panel next to
the hole plug. Drill four(4) 7/64" diameter holes in the casing using

the air intake coupling as the template.

The air intake coupling is sized for 2" PVC pipe.

install the combustion air pipe to the air intake coupling using RTV
sealant to provide for future serviceability.

Vent Pipe Connection

install the vent pipe grommet to the furnace panel. Locate the
grommet in the furnace panel at a location directly away from the

vent fitting on the combustion blower. The grommet snaps into the
3" hole plug from the furnace panel. NOTE: Depending on the

installation position, the vent pipe grommet will be installed to the
top panel or to the alternate location on the side panels. If needed,

remove the 3" hole plug from the furnace panel and relocate to the
open hole in the furnace panel. See Figure 8 through Figure 15.

The vent pipe grommet is sized for 2" PVC pipe.

install the vent pipe to the vent fitting on the combustion blower
using the clamp.

Note: The vent fitting MUST be installed with the air flow
marking arrow pointed toward the vent pipe. (See Figure 16)
Some installations require the vent fitting to be installed with
a 20 to 30 ° downward slope. (See Figures 8 - 15)

Vent Fitting
& Clamps

Proper Sealing Procedure for

Combustion Blower

Vent Pipe (Top panel exit)

Rubber Coupling & Clamps

Combustion

Blower

Vent
(Sidepanelexit)

DRAIN SIDE VIEW

Joining Pipeand Fittings

Fire hazard.

25-23-35

Provide adequate ventilation and do NOT
assemble near heat source or open flame. Do NOT
smoke while using solvent cements and avoid
contact with skin or eyes.

Observe all cautions and warnings printed on
material containers to prevent possible death,
personal injury and/or property damage.

This furnace is approved for venting with Schedule 40 PVC,
CPVC, ABS, Cellular Core pipe fittings and SDR-26 PVC.

NOTE: All PVC, CPVC, ABS, and Cellular Core pipe fittings, sol-
vent cement, primers and procedures MUST conform to Ameri-

can National Standard Institute and American Society for Testing
and Materials (ANSl/ASTM) standards.

• Pipe and Fittings - ASTM D1785, D2241, D2466,
D2661, D2665, F-891, F-628

• PVC Primer and Solvent Cement - ASTM D2564

• Procedure for Cementing Joints - Ref ASTM D2855

NOTE: In order to create a seal that allows future removal of pipe,
RTV sealant MUST be used on the inlet pipe where it joins to

the furnace. PVC, CPVC, ABS, and Cellular Core pipe and ce-
ment may be used on all other joints.

CAUTION

Do NOT use solvent cement that has become curdled,

lumpy or thickened and do NOT thin, Observe
precautions printed on containers, For applications

below 32 ° F., use only low temperature type solvent

cement.

1. Cut pipe end square, remove ragged edges and burrs.
Chamfer end of pipe, then clean fitting, socket and pipe
joint of all dirt, grease, or moisture.

44001 101004 [_

NOTE:Stirthesolventcementfrequentlywhileusing.Useanatu-
ralbristlebrushorthedaubersuppliedwiththecement.Theprop-

er brush size is one inch.

2. After checking pipe and socket for proper fit, wipe socket
and pipe with cleaner-primer. Apply a liberal coat of primer
to inside surface of socket and outside of pipe. Do NOT al-

low primer to dry before applying cement.

3. Apply a thin coat of cement evenly in the socket. Quickly
apply a heavy coat of cement to the pipe end and insert

pipe into fittings with a slight twisting movement until it bot-

toms out.

NOTE: Cement MUST be fluid while inserting pipe. If NOT, recoat

pipe.

4. Hold the pipe in the fitting for 30 seconds to prevent the ta-

pered socket from pushing the pipe out of the fitting.

5. Wipe all excess cement from the joint with a rag. Allow 15

minutes before handling. Cure time varies according to fit,

temperature and humidity.

Connecting VentPipesand Termination

NOTE: Combustion air intake and vent MUST terminate in the

same atmospheric pressure zone. If installation is in a cold cli-
mate (sustained temperatures below 0°F), increase the minimum

distance between vent pipe and air intake from 8" to 18".

CAUTION

Maintain a minimum of 36" between combustion air
inlet and clothes dryer vent, Terminate the combustion

air intake as far as possible from any air conditioner,

heat pump, swimming pool, swimming pool pumping,

chlorinator or filtration unit.

Poison carbon monoxide gas hazard.

Inlet and outlet pipes may NOT be vented
directly above each other

Failure to properly vent this furnace can result in
death, personal injury and/or property damage.

Install all couplings, nipples and elbows using proper pro-

cedures for Joining Pipe and Fittings and maintain spac-

ing between vent and combustion air piping as indicated in
Figure 17 through Figure 25.

iiiiiiiiiiiiii_i;!i:ii:ii:ii!;i:;!ii!iiiiiililiiiii_!_:i_I!¸_i_i_i!_!_ii_ii_ii!_!ii_i_ii_ii_ii_ii_iiiiii_iii_ii_ii_ii_iiiiiiiiiiiiii_iiiiiiiii_iiiiiiiiiiiiiii_iii_iiiiiiiiiiii_i_!!!

Sidewall Termination 12" or More

.............................................................................Above Snow Level or Grade Level

"18" Minimum for cold climates

(substained below 0° F)

HorizontalTermination

Cut two holes. 21/2" for 2" pipe, 3" for 21/2" pipe, or 31/2" for
3" pipe. Do NOT make the holes oversized, or it will be nec-

essary to add a sheet metal or plywood plate on the outside
with the correct size hole in it.

2. Check hole sizes by making sure it is smaller than the cou-
plings or elbows that will be installed on the outside. The
couplings or elbows MUST prevent the pipe from being

pushed back through the wall.

3. Extend vent pipe and combustion air pipe through the wall
3/4" to 1" and seal area between pipe and wall.

4. install the couplings, nipple and termination elbows as
shown and maintain spacing between vent and combus-

tion air piping as indicated in Figure 17 and Figure 18.

A metal shield is recommended 18" x 18" min. or 18" min. diame-
ter around the vent termination at the exterior wall to protect the

house exterior materials from flue product or condensation

(freezing) damage.

Using Exterior Risers

1. InstallelbowsandpipetoformriserasshowninFigure 18.

2. Secure vent pipe to wall with galvanized strap or other rust

resistant material to restrain pipe from moving.

3. insulate pipe with Armaflex or equivalent moisture resis-
tant closed cell foam insulation or Fiberglass insulation if

boxed in and sealed against moisture.

[_ 44001 101004

Sidewall Termination with Exterior

Risers to Get Above Snow Level or

Grade Level

j. "18" Minimumfor coldciimates

8"* _ (substainedbelow 0° F)

S MIN. /

20' /_W

MAX /

SNOW LEVEL 2_-00-04F

VerticalTermination

1. Figure 19 shows the proper installation and clearances for
vertical vent termination. The vertical roof termination

should be sealed with a plumbing roof boot or equivalent
flashing. The inlet of the intake pipe and end of the exhaust

vent must be terminated no less than 12" above the roof or
snow accumulation level, and 12" away from a vertical wall

or other protrusion.

2. Ifthe vent system is installed in an existing chimney make
sure clearances shown in Figure 19 are maintained. Hori-

zontal section before the termination elbow can be ex-
tended on the inlet air to provide necessary clearance.

Rooftop Termination

A = 12" Above roof or snow accumulation level
B = 8" Min., 20' Maximum, except in areas with extreme

cold temperatures (sustained below 0°F), the 18" Min.

VentTermination Shielding

Under certain wind conditions some building materials may be af-

fected by flue products expelled in close proximity to unprotected
surfaces. Sealing or shielding of the exposed surfaces with a cor-

rosion resistant material (such as aluminum sheeting) may be re-

quired to prevent staining or deterioration. The protective material
should be attached and sealed (if necessary) to the building be-
fore attaching the vent terminal.

MultiVent TerminationClearances

When two (2) or more furnaces are vented near each other, each
furnace must be individually vented.

Two (2) vent terminations may be installed as shown in
Figure 20, Figure 21, Figure 22, Figure 23, Figure 24 and

Figure 25, but the next vent termination must be at least 36" away
from first 2 terminations. It is important that vent terminations be
made as shown to avoid recalculation of flue gases.

Concentric Vent and Combustion-

Air Roof Termination

/

12"

or Snow Level

Combustion

Air

Dimension "A" is touching or 2" maximum separation.

iiiiiiiiiiiiiiiiiii_i:i:i:i:_!!!i!!!!!¸ii¸i¸i¸iiiii!iiiiiiiiiiiiiiiiiiiiiiiii;i;i;iiiiiiiiii;iiiiiiiiiiiii!ii!i!i!i!i!i!i!ii

Concentric Vent and Combustion-

Air Sidewall Termination

Exhaust

Vent 25-22-02d

Dimension 'W' is touching or 2" maximum separation.

Sidewall Inlet Vent and Exhaust-
Air Termination

8" Min,

18" Min, for

Cold Climates

(Sustained Below 0°F)

12" Min.Grade //

or Snow Level

__D mension "A" is touchin_ or 2" maximum separation.

44001 101004 [_

s,0ewa,,,o,e,Von,andExhau°,-A,rTermination with Exterior Risers

18" Min. for Cold Climates

(Sustained Below 0° F)

8" Min.

12" Min.
Grade or

Inlet Snow Level

Dimension "A" is touching or 2" maximum separation.

Rooftop Inlet Vent and Exhaust-

Air Termination

18" Min. for Cold Climates

(Sustained Below 0° F)

8" Min, \

Inlet 20' Max.

12" Min.
Grade or
Snow Level

/

Exhaust

25-22-43

Recommended Alternate
Installation for Sustained Cold

Weather (-0 ° F & below)

INLET

12"MIN, GroundLevel

_OR__ "_ SnowLevel

FRONT VIEW

Same Joist I

Space

12"

SIDE VlEW

12"

25-23-73

5. Gas Supply and Piping

Poison carbon monoxide gas, fire and explosion
hazard.

Models designated for Natural Gas are to be used
with Natural Gas Only, unless properly converted
to use with LP gas.

Failure to properly vent this furnace can result in
death, personal injury and/or property damage.

BTUH BTUH Natural LP

Standard Alternate Gas Gas

Rating Rating Orifice Orifice

50,000 40,000 #44 #55

75,000 60,000 #44 #55
100,000 80,000 #44 #55
125,000 100,000 #44 #55

NOTE: The rating plate is stamped with the model number, gas

type and gas input rating. In addition, models manufactured for
sale in Canada have orifice size information stamped on the rat-

ing plate.

AlternateBTUHInputRatings(USAOnly)

The inputrating of thesefurnaces can be changedfromthe stan-
dard inputratingto thealternate inputrating shown inTable 5, by

changing the main burner orifices. Changing of burner orifices

MUSTbe done by a qualified servicetechnician. Seesection on

changing orifices or following page.

SupplyPressure

Fire hazard.
Do NOT set input rating above that shown on

rating plate.

Failure to properly set input pressure can result in

death, personal injury and/or property damage.

1. Supply pressure can be checked using the 1/8" NPT port
on the supply side of the gas valve.

44001 101004

2. Gas input to burners MUST NOT exceed the rated input
shown on rating plate.

3. Do NOT allow minimum gas supply pressure to vary down-
ward. Doing so will decrease input to furnace. Refer to
Table 6 for normal gas supply and manifold pressures.

Gas

Type

Natural

LP

Gas Pressures Below 2000'

Supply Pressure

Recommended Max.

7" 14"

11" 14"

Important Note:

Manifold

Min. Pressure

4.5" 3.5"
11" 10"

With Propane gas, the rated input is obtained when
the BTU content is 2,500 BTU per cubic foot and

manifold pressure set at 10" W.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 major change in gas flow requires changing

burner orifice size.

MANIFOLDPRESSURE AND ORIFICE SIZE FORHIGH ALTITUDE APPLICATIONS

..... i

i_Tai_!_i_!_i_!i_!ii!_iii!_i! NATURALGAS

Elevation Above Sea Level

Heat Value

Btu/Cu.Ft. 0-1999 2000-2999 3000-3999 4000-4999 5000-5999 6000-6999 7000-7999

(".wc) (" .wc) (".wc) (".wc) (".wc) (".wc) (" .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

GasSupplyPressure

Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas sup-

pliers.

ManifoldGasPressureAdjustment

NOTE: Make adjustment to manifold pressure with burners oper-

ating.

Fire or explosion hazard.

Turn OFF gas at shut off before connecting

manometer.
Failure to turn OFF gas at shut off before

connecting manometer can result in death,
personal injury and/or property damage.

1.

2.

Remove the burner compartment door.

With gas OFF, connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15" water column

range.

3. Turn gas ON and remove adjustment screw cover on gas
valve. Turn counterclockwise to decrease pressure and

clockwise to increase.

4. For altitudes up to 2000', set pressure to value shown in
Table 6, ± 0.3" water column.

5. Connect manometer to the tapped opening on the outlet
side of gas valve. Use manometer with a 0-rain.15" water
column range.

6. Turn gas ON, fire the furnace and remove adjustment
screw cover on gas valve.

7. Turn counterclockwise to decrease pressure and clock-
wise to increase.

8. Set pressure to value shown in Table 6. Refer to Impor-
tant Note8 in Table 6. Pressure is also listed on furnace

rating plate.

9. When pressure is set, replace adjustment screw cover on
gas valve.

10. Replace the burner compartment door.

General DeraUngRules

1. For operation with natural gas at altitudes above 2,000',
orifice change and/or manifold pressure adjustment may

be required to suit gas supplied. Check with gas supplier. If
orifice sizing is needed, it should be based on reducing the

input rating by 2% (natural) or 4% (LP) for each 1,000'

above sea level. See Table 7 and Figure 26 for required
pressure change and/or orifice change for high altitudes.

44001 101004 [_

2. ForoperationwithLPgasataltitudesabove2,000',gasori-
ricesMUST be changed and manifold pressure MUST be

maintained as per Table 6. Orifice sizes for 0-2000' above
sea level are #54. 2000-7000' above sea level, use #55.
7000-8000' above sea level, use #56 orifices. Orifices can

be ordered through your distributor. (See Figure 26)

NOTE: The derating of these units at 2% (Natural) and 4% (L R)

has been tested and approved by AGA.

HighAltitudeAir PressureSwitch

Altitudes over 4,000' require a different air pressure switch than
the one installed at the factory. Check parts list for pressure switch
and consult your distributor for part number and availability. In

Canada, provincial codes may govern installation of switch.
Check with governing authorities.

ChangingOrificesfor HighAltitude

Electrical shock, fire or explosion hazard.

Turn OFF electric power (at disconnect) and gas

supply (at manual valve in gas line) when
installing orifices. Installation of orifices requires
a qualified service technician.

Failure to properly install orifices can result in
death, personal injury and/or property damage.

iiiii_!i_iiiiii!ii¸!!ii!iiiiiii;¸iii!iiiiii_iii!iiiiiiiiiiiii!iii;iiiiiiiiiiiiiiiiiiiiiiii!i

Typical Gas Piping for Upflow

NOTE: Main burner orifices can be changed for high altitudes.

1. Disconnect gas line from gas valve.

2. Remove combustion box front cover and manifold from fur-
nace.

3. Remove the orifices from the manifold and replace them
with properly sized orifices.

4. Tighten orifices so it is seated and gas tight. (See

Figure 26)

Changing Orifices

Measure from face of orifice

5. Reinstall manifold. Ensure burners do NOT bind on new
orifices.

Drip Leg and Union, Union* should
cabinet. Manual shut-off valve MUST be

of dripleg, union, and furnace.

Gas Pipe Grommet

(Single

Use elbows and 3" pipe

piping when using right
side gas pipe entry.

3" pipe

LP Low pressure

switch. Optional
on some models.

25-23-84

25-23-37

* Union may be installed inside the cabinet when necessary because of clearances.

NaturalGas Input RatingCheck

NOTE: The gas meter can be used to measure input to furnace.

Rating is based on a natural gas BTU content of 1,000 BTU's per

cubic meter. Check with gas supplier for actual BTU content.

1. Make sure combustion air box cover is in place and closed
before performing the following steps.

2. Turn OFF gas supply to all appliances and start furnace.

[_ 44001 101004

Example

Natural Gas No. of Seconds | TimePer Cubic BTUPer

BTUContent Per Hour t Footin Seconds Hour1,000 3,600 48 75,000

1,000 x 3,600 + 48 = 75,000 BTUH

3. Time how many seconds it takes the smallest dial on the
gas meter to make one complete revolution. Refer to Ex-

ample.

4. Relight all appliances and ensure all pilots are operating.

NOTE: If meter uses a 2 cubic foot dial, divide results (seconds)
by two.

Typical Gas Piping for Downflow

Use elbows and 3" pipe nipple to connect
valve to piping when using left side gas

pipe entry.

LP Low pressure
switch. Optional LP

conversion.

Drip Leg and Union, Union* should be outside

the cabinet. Manual shut-off valve MUST be

upstream of dripleg, union, and furnace.

Gas Pipe Grommet
(Single Pipe)

*Union may be installed inside the cabinet when necessary because of clearances.

GasPiping Requirements

NOTE: The gas supply line must be installed by a qualified ser-

vice technician in accordance with all building codes, (In the state
of Massachusetts, gas supply connections MUST be performed 1.

by a licensed plumber or gas fitter).

1. Properly size gas pipe to handle combined appliance load
or run gas pipe directly from gas meter or LP gas regulator. 2.

Refer to NFGC and ANSI Z223.1 for proper gas pipe size.

2. Install correct pipe size for run length and furnace rating.

3. Measure pipe length from gas meter or LP second stage
regulator.

NOTE: Refer to Figure 27 or Figure 28 for the general layout at

the furnace. The rules listed apply to natural and LP gas pipe

installations.

NOTE: On the Dual Certified or Direct Vent models, install the gas

pipe grommet to the furnace side panel with the gas pipe entry. If
needed, remove the 2" hole plug and relocate to the open hole in

the furnace side panel.

4. Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.

I OTE: The use of copper tubing for gas piping is NOT approved

by the state of Massachusetts.

5. Use ground joint unions and install a drip leg no less than 3"
long to trap dirt and moisture before it can enter gas valve. 4.

6. Use two pipe wrenches when making connections to pre-

vent gas valve from turning. 5.

44001 101004

25-23-39

7. Install a manual shut-off valve external to furnace casing
and tighten all joints securely.

Additional LP Connection Requirements

Have a licensed LP gas dealer make all connections at

storage tank and check all connections from tank to fur-
nace.

If copper tubing is used, it MUST comply with limitation set
in National Fuel Gas Code or CGA codes.

3. Two-stage regulation of LP gas is recommended.

FinalCheck

1. The furnace and its individual shut-off valve must be discon-
nected from the gas supply piping system during any pres-

sure testing of that system at test pressures in excess of

1/2" PSlG.

The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve dur-

ing any pressure testing of the gas supply piping system at

test pressures equal to or less than 1/2" PSlG.

2. Test all pipes for leaks.

3. Gas pressure MUST NOT exceed t/2" PSIG to gas valve,
Checking gas piping above t/2" PSIG requires the furnace

and manual shut-off valve to be disconnected during test-

ing.

Apply soap suds (or a liquid detergent) to each joint,

Bubbles forming indicate a leak.

Correct even the smallest leak at once.

6. Iforificeswerechanged,makesuretheyarecheckedfor
leakage.

6. Electrical Wiring

Electrical shock hazard.

Turn OFF electric power at fuse box or service

panel before making any electrical connections
and ensure a proper ground connection is made
before connecting line voltage.

Failure to do so can result in death, personal inju-
ry and/or property damage.

energized during continuous fan operation controlled by the elec-
tronic fan control.

Fan Control

The fan control is preset at the factory with a fixed blower ON
delay of 30 seconds in the heating mode. The blower OFF timing
is preset at 140 seconds. If desired, the fan OFF delay can be re-
set to obtain the longest delay times while still maintaining comfort

levels. See "Furnace Wiring Diagram".

PowerSupplyWiring

The furnace MUST be electrically wired and grounded in accor-
dance with local codes, or in the absence of local codes with the

latest edition of The National Electric Code, ANSI NFPA 70 and/or

The Canadian Electric Code CSA C22.1.

Field wiring connections must be made inside the furnace con-

nection box. A suitable strain relief should be used atthe point the
wires exit the furnace casing.

Copper conductors must be used. Line voltage wires should be
sized for the input amps stated on the rating plate. Furnace should

be connected to its own separate circuit.

Thermostat

Thermostat location has an important effect on the operation of
the unit. Follow instructions included with thermostat for correct

mounting and wiring.

Low voltage connections to furnace must be made on terminal

board to fan control.

Set thermostat heat anticipator in accordance with the Technical

Support Manual.

OptionalEquipment

All wiring from furnace to optional equipment MUST conform to

local codes or, in the absence of local codes with the latest edition

of The National Electric Code, ANSI NFPA 70 and/or The Cana-
dian Electric Code CSA C22.1. Install wiring in accordance with

manufacturer's instructions. The wiring MUST have a minimum
temperature rating of 105 ° C.

Humidifier/ElectronicAir Cleaner

The furnace is wired for humidifier and/or electronic air cleaner
connection.

CAUTION

Do NOT exceed 115V/0.8 amp. maximum current load

for both the EAC terminal and the HUM terminal
combined.

NOTE: The humidifier will be powered when the furnace is fired

and the circulating air blower comes on. The electronic air cleaner
will be powered anytime the air circulating blower is energized

during the heat mode. However, the electronic air cleaner is NOT

Fan Delay DIP Switch Settings

COOL ON DELAY: 6 SEC.
COOL OFF DELAY: 60 SEC.

HEAT ON DELAY: 30 SEC.

HEAT OFF DELAY

60SEC 100SEC 140SEC 180SEC

25-23-47

Electrical Connections

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

right side.

11_v. _0HL

Conn_ion

=

Q_nd

ControlCenterFuse

25-23-42

The 24V circuit contains a 5-amp, automotive-type fuse located
on fan timer board. (See Figure 30) Any electrical shorts of 24V
wiring during installation, service, or maintenance may cause

fuse to blow. If fuse replacement is required, use only a fuse of
identical size (5 amp.)

[_ 44001 101004

iiiiiiiii!:iiiiiiiii ; i;i;i;i;i;i;i!!!!!!!!;!;iii !;iiiiii ¸!;!;;;ii;i;i;i;i;i

Fan Timer Connections

DIPSwitch

FUSE

25-23-41

7. Ductwork and Filter

Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or

utility room. Return air duct MUST be sealed to

furnace casing.

Failure to properly seal duct can result in death,
personal injury and/or property damage.

Installation

NOTE: Design and install air distribution system to comply with

Air Conditioning Contractors of America manuals and/or NFPA
pamphlets 90A and 90B or other approved methods that conform

to local codes and good trade practices.

2.

3.

When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct

outside furnace space.

Install air conditioning cooling coil (evaporator) on outlet

side of furnace.

For furnaces installed without a cooling coil it is recom-
mended that the outlet duct be provided with a removable

access panel. This panel should be accessible when the
furnace is installed so the exterior of the heat exchanger

can be viewed for inspections. The access panel MUST be
sealed to prevent leaks.

If separate evaporator and blower units are used, install

good sealing dampers for air flow control. Chilled air going
through the furnace could cause condensation and shorten

the furnace life.

NOTE: Dampers (field supplied) can be either automatic or
manual. Manually operated dampers MUST be equipped with a

means to prevent furnace or air conditioning operation unless
damper is in the full heat or coo! position.

Poison carbon monoxide gas hazard.
Cool air passing over heat exchanger can cause

condensate to form resulting in heat exchanger
failure.

This could result in death, personal injury and/or
property damage.

Connections

NOTE: On upflow installations, return air can enter through either

side, both sides, orthe bottom. On horizontal or downflowinstalla-
tions the return air must enter through the knockout opening in the

lower panel of the furnace. Return air can not enter through rear
of the furnace. When the furnace is located in an area near or ad-

jacent to the living area, the system should be carefully designed
with returns to minimize noise transmission through the return
grille. Any blower moving a high volume of air will produce audible

noise which could be objectionable to when the unit is located
very close to living areas. It is advisable to route the return air
ducts under the floor or through the attic.

44001 101004 [_

Forsideconnectionsusinga16"x25"filter,cutouttheem-
bossedareashowninFigure31. This wil! provide a 141/2"

x 221/2 " approximate opening.

Side Return Air Cutout

A = 141/2" Height of Cutout for 16" x 25" Filter
B = 221/2" Width of Cutout for 16" x 25" Filter

B

Embossed Area
on Side of Furnace

Furnace
Bottom

NOTE: Furnaces with 5 TONS cooling rating require two(2) side

returns or one side return with bottom return.

2. Bottom returns can be made by removing the knockout
panel in the furnace base. Do NOT remove knock-out ex-

cept for a bottom return.

3. Installation of locking-type dampers are recommended in

all branches, or in individual ducts to balance system's air
flow.

4. Non-combustible, flexible duct connectors are recom-
mended for return and supply connections to furnace.

5. If air return grille is located close to the fan inlet, install at
least one, 90 ° air turn between fan and inlet grille to reduce

noise.

NOTE: To further reduce noise, install acoustical air turning

vanes and/or line the inside of duct with acoustical material.

Sizing

Existing or new ductwork MUST be sized to handle the correct
amount of airflow for either heating only or heating and air condi-
tioning.

Insulation

1. Insulate ductwork installed in attics or other areas exposed
to outside temperatures with a minimum of 2" insulation

and vapor barrier.

2. Insulate ductwork in indoor unconditioned areas with a
minimum of 1" insulation with indoor type vapor barrier.

Filters

A Filter must be used:

Filters are not supplied with these furnaces, but can be purchased

from dealer.

Use either filter type:

• Washable, high velocity filters are based on a maximum
air flow rating of 600 FPM.

• Disposable, Iowvelocity filters are based on a maximum
air flow of 300 FPM when used with filter grille.

NOTE: Disposable, low velocity filters may be replaced with
washable, high velocity filter providing they meet the minimum

size areas. Washable, high velocity filters can be replaced ONLY
with same type and size.

Side Mounted Filter Rack

°I / jJ

25-20-90

FilterInstallation using Optional Filter Rack

When installing or removing abottom mounted filter, slide the two
side filter clips to the back of the furnace BEFORE installing or re-
moving. This will allow the filter to clear the front raised edge of the
furnace. Insert filter into side clips first and push filter back until it is
fully engaged into back clip. When filter is in place, slide clips back

into place midway on filter as shown in Figure 33.

Bottom Mounted Filter Rack

AW3192

Slide filter clips towards back before removing

Refer to Figure 34 and for guidelines to install filters. Furnaces

which require larger filter media and have limited clearances on
one side of furnace, require a standoff filter rack, see Figure 34,

available from your distributor.

[_ 44001 101004

StandoffFilter Rack

Using Optional

Standoff Filter

Rack

25-21-45a

Note: The three(3) screws in the top panel of the furnace next to
the duct flange MUST be removed to provide serviceability of the

primary heat exchangers in the downflow installation

1. Position plenum through the floor and set the furnace over
the opening in the floor. If necessary, grout around the base

to seal air leaks between the base and the floor.

CombustibleFloorInstallation

Fire Hazard.
Place furnace on noncombustible subbase on

downflow applications, unless installing on
non-combustible flooring.

Failure to install unit on noncombustible
subbase can result in death, personal injury

and/or property damage.

CAUTION

If filters are only suitable for heating application,

advise homeowner that filter size may need to be

increased if air conditioning is added.

AdditionOf Air Conditioning

When a refrigeration coil is used in conjunction with this unit, it
must be installed on the discharge side of the unit to avoid con-

densation on the heat exchanger. The coi! installation instructions
must be consulted for proper coil location and installation proce-

dures. With a parallel flow arrangement, dampers must be

installed to prevent chilled air from entering the furnace. If manu-
ally operated dampers are used, they must be equipped with a
means to prevent operation of either unit unless the damper is in

full heat or full cool position.
A 3" clearance is required on the right side of the furnace in order

to run the condensate drain line. Copper, iron or plastic tubing
may be used for the condensate drain line.

DownflowFurnaceInstallation

Non-Combustible FloorInstallation

Fabricate a plenum to the dimensions given in Figure 3, for the
furnace outlet. Plenum should be flanged, approximately 3/4" for
support.

Subbase for Combustible Floor

NOTE: The three(3) screws in the top panel of the furnace next to

the duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation

Note: When using the subbase for combustible floors, the dis-
charge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the

duct flanges flat onto the furnace casing. DO NOT bend the duct
flanges inward (toward the heat exchangers) as air flow restric-
tions may occur.

The Subbase for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the fur-

nace is installed on a coil box.

Cut the opening in the floor according to Table 8. The hole

in the floor must be cut to the dimensions listed in Table 8

since the base is equipped with locating tabs that center
the base over the opening.

The opening in the base is 1t/4" shorter and 11/8" narrower than
the recommended size of the opening in the floor. This is done to

maintain clearance between the floor and the plenum.

2. Fabricate the plenum to the dimensions given in Table 8.
Note that the dimensions given are outside dimensions.

44001 101004 E_

Subbases for Combustible Floors Dimensions

Subbase for Combustible

Floors Part Number

Furnace Subbaee

NAHH001SB
NAHH002SB

NAHH003SB
NAHH010SB

Subbase for
Coil Cabinets

NAHH004SB
NAHH005SB

NAHH006SB
NAHH009SB

Subbase for Combustible

Floor Dimensions

H* J* K**

1511/16 283/4 149/16 16

195/16 283/4 183/16 16

225/16 283/4 2113/16 16

243/4 209/I6 239/16 161/4

1511/t6 209/I6 149/16 161/4

195/16 209/16 183/16 161/4

23 209/16 2113/16 161/4

2411/t6 283/4 239/16 16

Opening In Floor

M N

161/4 145/8
181/4 18t/4

181/4 217/8
161/4 235/8

161/4 145/8
181/4 18t/4

181/4 217/8
161/4 235/8

Opening In Base

For Plenum

P R

15 131/2
15 171/8

15 193/4
15 221/2

15 131/2
15 171/8

15 193/4
15 221/2

Typical Plenum

Dimensions

S T

15 131/2
15 17t/8

15 193/4
15 221/2

15 131/2
15 17t/8

15 193/4
15 221/2

* Outside Dimension
** Base Spacer Side To Side

3. Set the base over the opening in the floor, centering it over
the opening. Fasten the base to the floor with screws or

nails. See Figure 35, Figure 36 and Figure 37.

Plenum

l"

Combustible

Floor Base

Furnace Subbase

25-20-46

A = 41/4" Minimum clearance from back of hole
to wall or other obstruction.

Coil Cabinet Subbase

25-20-46b

Plenum

A = 4 1/4" Minimum clearance from back of hole to wail or other obstruction,

4. Drop the plenum through the opening in the base. The
flange of the plenum should rest on top of the subbase.

5. Position furnace or coil cabinet and furnace on subbase so

it aligns between the locating tabs.

Setting the Subbase

Furna

Insulation of
Combustible
Floor Bas

J

___ _"_/W_dood Floor

Wood Scre_ _/_ _ Plenum 25-20-46a

This subbase for combustible floors has been designed so that
the height of the subbase raises the downflow coil off the floor to

allow easy installation of the condensate drain. See Figure 38.

[_ 44001 101004

Condensate Line Raised by Base

25-20-52

8. Checks and Adjustments

Startup

NOTE: Refer to the start-up procedures in the "User's Informa-

tion Manual" or to the "Operating Instructions Label" on the fur-
nace.

CAUTION

If any sparks, odors or unusual noises occur,
immediately shut OFF power to furnace. Check for

wiring errors or obstruction to blower.

4. For altitudes up to 2000', set pressure to value shown in
Table 6, _+0.3" (8mm) water column. For altitudes of 2000'

to 8000', see Section 5 for correct pressure setting.

Adjust PilotBurner

The furnace has a pilot flame to light the main burner. The flame
should surround 3/8"to t/2" ofthe flame sensor. See Figure 39. To

adjust, remove cap from pilot adjusting screw on gas valve. Turn
screw counterclockwise to increase or clockwise to decrease

flame as required. Replace adjusting screw cap.

GasSupplyPressure

Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas sup-

pliers.

ManifoldGasPressureAdjustment

NOTE: Make adjustment to manifold pressure with burners oper-

ating.

Fire or explosion hazard.

Turn OFF gas at shut off before connecting

manometer.
Failure to turn OFF gas at shut off before

connecting manometer can result in death,
personal injury and/or property damage.

1. Remove the burner compartment door.

2. With gas OFE connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15" water column

range.

3. Turn gas ON and remove adjustment screw cover on gas
valve. Turn counterclockwise to decrease pressure and

clockwise to increase.

Pilot Burner

Proper Flame _ Flame Sensor
Adjustment _

3/8" to 1/2" /_

_ / _"_ Hot Surface

nte

10-11-65

MainBurnerFlameCheck

Allow the furnace to run approximately 10 minutes then inspect
the main burner and pilot flames. See Figure 40.

Check for the following (Figure 40):

• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yel-

low tips.

• Flames extending directly from burner into heat ex-
changer.

• Flames do NOT touch sides of heat exchanger.

If any problems with main burner flames are noted, it may be nec-

essary to adjust gas pressures, or check for drafts.

44001 101004 [_

Main Burner

10-10-78

TemperatureRiseCheck

The blower speed MUST be set to give the correct air temperature

rise through the furnace as marked on the rating plate. Tempera-

ture rise is the difference between supply and return air tempera-
tures,

To check temperature rise,use the following procedure:

1. Place thermometers in supply and return air registers as
close to furnace as possible, avoiding direct radiant heat
from heat exchangers.

2. Operate furnace continuously for 15 minutes with all regis-
ters and duct dampers open.

3. Take reading and compare with range specified on rating

plate.

4. If the correct amount of temperature rise is NOT obtained, it

may be necessary to change blower speed. A higher blow-

er speed will lower the temperature rise. A lower blower
speed wil! increase the temperature rise.

ChangingBlowerSpeed

Electrical shock hazard.

Turn OFF power to furnace before changing speed
taps.

Failure to do 8o can result in death and/or personal in-

jury.

NOTE: The speed taps that the manufacturer sets from the facto-

ryfor this product are based on a nominal 400 CFM per ton cool-
ing and the basic mid range on the temperature rise for heating.

Since the manufacturer cannot establish the static pressure that
will be applied to the unit, it is the responsibility of the installer
dealer/contractor to select the proper speed taps for the applica-

tion when the unit is installed.

If it is necessary to change speeds, refer to steps below.

1. Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the electronic fan con-
trol as well as location of unused blower motor speed

leads. Use the chart (Table 9) to determine the blower mo-

tor speed settings.

Blower Speed Chart

Wire Color

Black

Orange*

Blue
Red

Motor Speed

High

Med-High

Medium

Low

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

Change the heat or cool blower motor speed by removing
the motor lead from the "Heat" or "Cool" terminal and re-

place it with the desired motor speed lead from the "Un-
used Motor Lead" location. Connect the wire previously

removed from the "Heat" or "Cool" terminal to the vacated
"Unused Motor Lead" terminal.

If the same speed must be used for both heating and cool-
ing, remove the undesired motor speed lead from the

"Heat" or "Cool" terminal and connect that lead to the

open terminal at "Unused Motor Lead" location. Attach a
jumper between the "Heat" and "Cool" terminals and the

remaining motor speed lead.
Note: For motors with (4) speed leads, it will be necessary

to tape off the terminal of the motor speed lead removed
from the "Neat" or "Cool" terminal with electrical tape since

an open terminal will not be available atthe "Unused Mo-

tor Lead" location.

ContinuousFan Operation

A terminal is provided on the electronic fan control located in the
circulating blower compartment for operation of the continuous
fan option. This connection is intended for the low speed motor

tap, and has a lower contact rating (8 amps) than the heat and
cool taps. When the low speed blower lead is connected to this

terminal, this will provide low speed blower operation whenever
the other two speeds (Heat or Cool) are not energized.

Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of op-

eration.

Separate speed selections for Heat,Cool, and
Continuous Fan

Connect low speed lead from circulating motor to the "Cont." ter-
minal at the electronic fan control. The appropriate motor leads

should already be connected to the "Heat" and "Cool" terminals.

Heatingand ContinuousBlowerSpeed the Same

If it is necessary to operate the heating speed and continuous

blower speed using the same blower speed, connect a jumper be-
tween the "Heat" and "Cont." terminals on the electronic fan con-

trol.

Note: There should be only ONE motor lead going to the "Heat"
and Cont.' terminals.

[_ 44001 101004

9. Furnace Maintenance

CAUTION

It is recommended that the furnace be inspected and

serviced on an annual basis (before the heating
season) by a qualified service technician.

See "User's Information Manual" and the "Service

Manual".

10. Sequence of Operation & Diagnostics

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 Coo! Fan On Delay time.

Y & G signals removed from EFT.

• Cool motor speed de-energized after 60 second Coo! Fan Oft Delay time.

CirculatingFan (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.

• Following a 3 second prepurge 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 opening of the main gas valve, the control wil! delay 30 seconds 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 Requestwith Gas Supply LineShut Off:

24 VAC signals applied to W terminal of EFT control.

• Inducer motor turns on.

• The gas valve solenoid energizes.

• Following a 3 second prepurge 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 oft 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.

44001 101004 [_

GasValveDiagnosticCodes(SeeFigure41)

OFF = Control not powered

Heartbeat = Normal Operation (Standby or call for heat)
1 Flash = Not used

2 Flashes = Pressure switch closed when should be open
3 Flashes = Pressure switch circuit was still sensed as open 30 seconds after the inducer was energized. System is

in 5 minute delay mode, with inducer off. After 5-minute delay, a new ignition sequence will be initiated.
(Note: SV9541M On/Oft switch in off position during a call for heat will generate this diagnostic code)

4 Flashes = Limit switch string open
5 Flashes = Flame sensed out of sequence - Flame signal still present.

6 Flashes + 1 Note 1 = Soft Lockout -Maximum retry count exceeded (failed to light within 4 trials for ignition)
6 Flashes + 2 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded - Last failure was Flame Sense Lost During Run

6 Flashes + 3 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded - Last failure was Airflow Proving Circuit Opened

During Run

6 Flashes + 4 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded - Last failure was Limit Circuit Opened During Run
7 Flashes = Soft Lockout Due to Limit Trips Taking Longer than 2 minutes to Reset; Auto Reset After 1 Hour if

Call for Heat Still Present. Reset by Cycling Call for Heat at Any Time.

NOTE 1 :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. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence
after a five minute delay period, if the call for heat is still present. Reset of the thermostat wil! initiate a new ignition sequence immediately.

NOTE 2: Any combination of 5 'abnormal' events during a single call for heat will result in soft lockout. An 'abnormal' event is a Flame
Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code wil! indicate which

was the last 'abnormal' event that put the system into the soft lockout state based on the table above.

Typical Gas Valve Honeywell

OUTLET

PiIot Pressure
Adjustment

(Hidden)_

On\Off
Switch

INLET

Diagnostic Light

Manifold Pressure
Adjustment

dwg 25-23-31a

[_ 44001 101004

HONEYWELL SV9541M "SMART VALVE" Sequence of Operation

POWER APPLIED TO APPLIANCE

i

THERMOSTAT CALLS FOR HEAT

¢

PRESSURE SWITCHES PROVED OPEN?

COMBUSTION BLOWER ENERGIZED

PRESSURE SWITCHES CLOSED WITHIN

30 SECONDS?

i

I 3 SECOND PRE-PURGE

I

PILOT VALVE OPENS:

IGNITOR POWERED (1)

i

PILOT LIGHTS AND FLAME IS SENSED

DURING 90 SECOND TRAIL FOR

IGNITION?

YES

MAIN VALVE OPENS,

HEATING FAN "ON" DELAY BEGINS

AFTER DELAY: CIRCULATING BLOWER

STARTS

FLAME SENSE LOST?

I

THERMOSTAT CALL FOR HEAT ENDS

_ NO

PILOT AND MAIN VALVE CLOSE

COMBUSTION BLOWER DE-ENER-

GIZED AFTER 30 SECOND POST PURGE

CIRCULATING BLOWER OFF AFTER

DELAY

V

I

WA,TFORPRESSURESW,TOHESTOOPENI

COMBUSTION BLOWER DE-ENERGIZED

FIVEMINUTEWAITPERIOD

I

THREE SECOND FLAME [_

FAILURE RECYCLE DELAY

YES

I

PILOTVALVECLOSES;

PILOTIGNITOROFF

PILOT AND MAIN VALVE CLOSE

V

FLAME SENSE LOST MORE THAN FIVE |

TIMES INTHIS CALL FOR HEAT?

YES

r

CIRCULATING BLOWER OFF AFTER

DELAY

COMBUSTION AIR BLOWER OFF AFTER

POST PURGE

WAIT FOR NEXT CALL FOR HEAT I

(1) Ignitor "ON" for first 30 seconds oftrial for ignition, then "OFF" for next 30 sec-

onds. If the pilot has not lit, itturns back "ON" for the final 30 seconds. The pilot
valve remains energized during the entire 90 second trial for ignition.

NOTE: If main limit string opens and takes longer than 2 minutes to close, system

goes into 1 hour wait period.

44001 101004 [_

HONEYWELL SV9541M "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

INDICATES CHECK/REPAIR

STATUS

Line voltage input at L1 and Neutral connectors on ST9160B Fan Timer.

Off No power to system control. Low voltage (24V) power at 24 VAC and COM terminals on ST9160B

System wiring harness is in good condition and securely connected.

Heartbeat Normal indication whenever the system is powered, unless some
Bright - Dim abnormal event has occurred. Not Applicable - Normal Operation (stand by or call for heat)

Pressure switches closed when itshould be open Pressure switches stuck closed (system will wait for pressure switch to
(i.e. when call for heat begins).

2 Flashes open).

(Combustion blower is not energized until pressure switches
opens) Pressure switches miswired orjumpered.

Pressure switches, open when they should be closed (i.e.longer

than 30 seconds after combustion blower!inducer is energized).

3 Flashes

4 Flashes

5 Flashes

6 Flashes +
1 Flash

6 Flashes +
2 Flashes

System goes into 5-minute delay period, with combustion blower/
inducer off. At end of the 5-minute delay, another cyclewill begin.

Main Umit or Roll Out Switch is open.

Combustion blower is energized, Circulating blower is energized
heat speed.

Flame signal sensed out of proper sequence.
Combustion blower is energized, Circulating blower is energized

heat speed after the "ON" delay.
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,

SoftLockout.

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,

Ignition system control switch must be in the ON position.
Pressure switches operation, tubing, and wiring.

Restrictions in furnace air intake or vent piping.

Main limit switch.
Manual reset burner rollout switch.

Limit and rollout switch wiring is in good condition and securely
connected.

Flame at pilot burner.

Gas supply off or pressure too low or high for appliance to operate.
Damaged or broken HIS element

Line voltage HOT lead wire not connected to L1 terminal on ST9160B.
Furnace not properly earth grounded.

Flame sense rod contaminated or in incorrect position.
Pilot burner located in incorrect position.
Pilot burner lead wires are in good condition and popery connected.
Pressure switches operation, tubing, and wiring.

Gas supply off or pressure too low or high for appliance to operate.
Line voltage HOT lead wire not connected to L1 terminal on ST9160B.

Furnace not properly earth grounded.
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

Condensate drain blocked
Pressure switches operation, tubing, and wiring.

[_ 44001 101004

HONEYWELL SV9541M "SMART VALVE" Trouble shooting continued

LED

INDICATES CHECK/REPAIR

STATUS

SoftLockout.

6 Flashes +
3 Flashes

6 Flashes +
4 Flashes

7 Flashes

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,

Soft Lockout.

Lastfailurewaslimitcircuitopenedduringrun.

Combustion air blower is de-energized, Circulating blower is
de-energized after the "OFF" delay.

After5-minute delaytime,controlsystemwillresetandinitiatea
newignitionsequence,

Soft Lockout.

Blowerfailure(typical)
Limittrip tooklongerthan2 minutesto reset.

Systemwillstarta newignitionsequenceafter1 hour,if callfor
heatstill present.

Ignitionsystemcontrolswitchmustbein theONposition.
Pressureswitchesoperation,tubing,andwiring.

Restrictionsinfurnaceairintakeorventpiping.
Highwindsblowingagainstvent.

Mainlimitswitch.
Limitand rolloutswitchwiringisin goodconditionandsecurely

connected.
Restrictioninduct work.

Dirtyfilter

Deadblower.
Blockedductwork.

44001 101004 [_

11. Concentric Termination

VentTermination Clearances

Poison carbon monoxide gas, fire and explo-
sion hazard.

Inlet and outlet pipes may NOT be vented
directly above each other (standard vent
terminals).

Failure to properly vent this furnace can result in
death, personal injury and/or property damage.

1. Determinetermination locations based on clearances spe-
cified in following steps and as shown in Figure 7,

Figure 42 through Figure 47,

2. The vent termination must be located at least 12" above
ground or normally expected snow accumulation levels.

Do NOT terminate over public walkways. Avoid areas

where condensate may cause problems such as above

planters, patios, or adjacent to windows where steam may

cause fogging.

The venttermination shall be located at least 4' horizontally
from any electric meter, gas meter, gas regulator, and any

relief equipment. These distances apply ONLY to U.S.
installations.

The vent termination is to be located at least 3' above any
forced air inlet located within 10' ; and at least 10' from a

combustion air intake of another appliance, except another
direct vent furnace intake.

6. In Canada, the Canadian Fuel Gas Code takes prece-
dence over the preceding termination instructions.

ConcentricVentTermination- Kit#
NAHA001CV& NAHA002CV

These kits are for vertical or horizontal termination of the combus-
tion air inlet and the exhaust vent pipes on Category iV gas-fired

condensing furnaces. The NAHA001CV kit can be used for 3" di-
ameter pipe systems. The NAHA002CV kit can be used for 2"
diameter pipe system. Refer to Table 10 for the correct pipe size

for the furnace. Both the combustion air inlet and the exhaust vent
pipes must attach to the termination kit. The termination kit must

terminate outside the structure and must be installed per the

instructions outlined below for vertical or horizontal termination.

Vertical termination is preferred. Field supplied pipe and fittings
are required to complete the installation.

Kit Contents:

Kit Components

3" Rain Cap or 2" Rain Cap
3" Diameter SDR-26 Pipe, 191/2" Long or
4" Diameter SDR-26 Pipe, 371/8" Long,
2" Diameter SDR-26 Pipe, 315/8" Long or

21/2" Diameter SDR-26 Pipe, 24" Long,
3" Y Concentric Fitting or 2" Y Concentric Fitting

3" or 4" Dia.

SDR-26 Pipe

2" or 3" Dia. 2 or 21/2" Dia.

Y Concentric Fitting SDR-26 Pipe

2" or 3" Dia.
Rain Cap

25-22-03

Vertical& Horizontal Termination

1.

2.

Determine the pipe diameters required for the installation

from Table 10 and Figure 44.

Determine the best location for the termination kit. See
Figure 43 for vertical termination or Figure43 and

Figure 47 for horizontal termination. Roof termination is

preferred since it is less susceptible to damage, has re-
duced intake contaminants and less visible vent vapor. For

side wall termination, consideration should be given to: 1)
possible damage from the vapors to plants/shrubs, other

equipment and building materials, 2) possible damage to
the terminal from foreign objects, 3) wind effects that may
cause recirculation of flue products, debris or light snow

and 4) visible vent vapor.

Concentric Vent Roof Installation

Vent!_ Maintain 12" rain. clearance

U

above highest anticipated
snow level. Max. of 24"

above roof.
Combustion
Air

Roof Boot/
Flashing
(Field

Support

(Field Supplied)

j45 Elbow

(Field Supplied)

Vent

Combustion
Air 25-22-02

Note:
Support must be field installed to secure termination kitto structure.

3. Cut one 5" diameter hole through the structure for the
NAHA001CV Kit or one 4" diameter hole for the

NAHA002CV Kit.

[_ 44001 101004

4.DimensionDmaybelengthenedto60"max.orshortenedby
cuttingthepipesto12"min.DimensionAwillchangeaccord-
ingtoDdimension.(SeeFigure44)

ConcentricVentDimensional

...........................................................................Drawing

B PVC
Vent/Exhaust

11/2"-- : _

PVC Intake/Combustion Air

A -_

25-22-03

Model A* B C D**

NAHA001CV 387/8 3 41/2 211/8
NAHA002CV 333/8 2 31/2 167/8

* = Dimension will change accordingly as dimension D is

lengthened or shortened.

**= Dimension D may be lengthened to 60" may also be

shortened by cutting the pipes provided in the kit to 12"
minimum

Concentric Termination Kit

Ta_i_ _ NAHA001 CV & NAHA002CV Venting

Table Dual Piping ONLY

50,000 & 75,000 Btuh Furnaces

NAHA002CV - 35' & (4) 90 ° elbows with 2" PVC pipe
NAHA001CV - 65' & (4) 90 ° elbows with 3" PVC pipe

100,000 Btuh Furnace

NAHA001CV - 65' & (4) 90 ° elbows with 3" PVC pipe

125,000 Btuh Furnace

NAHA001CV - 35' & (4) 90 ° elbows with 3" PVC pipe

1. Do not include the field supplied 45 °elbow in the total elbow
count.

2. If more than four elbows are required, reduce the length of

both the inlet and the exhaust pipes five feet for each

additional elbow used.

3. Elbows are DWV long radius type for 2" and 3" vents.

If more than four elbows are required, reduce the length of
both the inlet and exhaust pipes 5' for each additional elbow

used.

* Feet of pipe iswhichever pipe run is the longest, either inlet
or outlet side.

If assembly needs to be extended to meet height or side wall

thickness requirement, the two pipes supplied in the kit may be

replaced by using the same diameter solid, single (no coupling

connections) field supplied SDR-26 PVC (ASTM D2241) pipes.

Do not extend dimension D more than 60". (See Figure 44)

Do not use field supplied couplings to extend the
pipes. Airflow restriction will occur and the furnace

pressure switch may cause intermittent operation.

Partially assemble the concentric vent termination kit.

Clean and cement the parts using the procedures for Join-

ing Pipe and Fittings section of the manual. A) Cement the

Y Concentric fitting to the 4" diameter kit pipe. (See

Figure 45) B) Cement the 3" rain cap to the 21/2" diameter

kit part. (See Figure 45) NOTE: A field supplied stainless
steel screw may be used to secure the rain cap to the pipe

instead of cementing when field disassembly is desired for

cleaning (See Figure 45)

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;i

25-22-02

Rain Cap to Vent Pipe Assembly

Drill clearance hole in rain
cap and pilot hole in vent pipe.

Stainless steel screw
(Field supplied)

Poison carbon monoxide gas hazard.

When using the alternate screw assembly
method, drill a clearance hole in the rain cap and
a pilot hole in the vent pipe for the screw size
being used. Failure to drill adequate holes may
cause cracking of the PVC components,
allowing flue gases to be recirculated.

Failure to follow this warning could result in

death, personal injury and/or property damage.

Poison carbon monoxide gas hazard.

Do not operate the furnace with the rain cap
removed as recirulation of the flue gases may
occur. Water may also collect inside the larger
combustion air pipe and flow to the burner

enclosure.

Failure to follow this warning could result in
death, personal injury and/or property damage.

Install the Y concentric fitting and the pipe assembly
through the structure's hole. For vertical termination, install
the parts through the field supplied roof boot/flashing.

NOTE: Do not allow insulation or other materials to accu-
mulate inside the pipe assembly when installing through

the structure's hole.
Secure the assembly to the structure as shown in

Figure 43 or Figure 47 using field supplied metal strap-
ping or equivalent material.

NOTE: Ensure the termination height is above the roof sur-
face or anticipated snow level as shown in Figure 43 for

vertical termination. Ensure the termination location clear-
ancedimensions areas shown in Figure 46and Figure 47

for horizontal termination.

44001 101004 E_

iiiiiiiiiiii_ii_i!i_i_i_;i;!!i!iii_iiiiiiiii_i_iii_;!_il!i_iiiiii_iii_iiilii_ii_i_!_!i!i!i!_i_iiiii!!_!_i!_i_i_i_i_iiiiiiiii_i_i_i_iiii_i_i_i_i_i_i_i_i

ConcentricVentand Combustion-

...........................................................................Air Side Termination

Roof Overhang

_1" max

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Maintain 12" clearance above high-
est anticipated snow level or grade
whichever is greater. 25-22-02

Concentric Vent Sidewall

Attachment

Strap

(Field Supplied) X

Vent

Combustion

Air 45 ° Elbow

(Field Supplied)

Combustion

Air

ent

_d..-¢d_..-- Flush to
;;;;;; 1"max.

25-22-02

Note:

Securing strap must be field installed to prevent movement of ter-
mination kit in side wall.

8. Install the rain cap and the small diameter pipe assembly in
the Y concentric fitting and the large pipe assembly. Ensure

that the small diameter pipe is bottomed out and securely
cemented in the Y concentric fitting,

9. Cement the furnace combustion air and vent pipes to the
concentric vent termination assembly. See Figure 43 or

Figure 47 for proper pipe attachment.

10. Operate the furnace through one heat cycle to ensure com-
bustion air and vent pipes are properly connected to the

concentric termination connections.

[_ 44001 101004