ICP N9MPD100J14A2, N9MP1075B12A1, N9MP1100J20A1, N9MP2100J20A1, N9MP2125J20A1 Installation Instructions Manual

90+SingleStageN9MP1&N9MP2

*9MPD *Denotes Brands (C, H, T)

FAN ASSISTED,

CategoryIVFurnaceo,. czw.z FURNACE

See section 4 for Cateqory IV definition.

SAFETY REQUIREMENTS

This furnace ca n be installed as a direct vent furnace using outside air for combustion or the furnace ca n 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 provided to compensate for oxygen
burned. See the Indoor Combustion Airsection in the Combustion and Ventilation Aircha pter. If combustion air is drawn from outside the structure, it
MUST be taken from the same atmospheric pressure zone as the vent pipe.

Recognize safety information. This is the safety- alert symbolZ_. When you see this symbol on the furnace and in instructions manuals be alert to the

3otential for personal injury.
Jnderstand the signal words DANGER. WARNING. or CAUTION. These words are used with the safety-alert symbol. DANGERidentifies 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 in minor 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 personnel 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 (NFGC) ANSI
Z223.1 - 2002/N FPA No. 54- 2002. In Canada, refer to the current edition of the National Standard of Canada Natural Gas and Propane Installation Code

(NSCNGPIC) CSA B149.1-00. Wear safetyglassesandworkgloves. Havefireextinguisher availableduringstart-upand 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 require

these instructions as a minimum for a safe installation.

.......la all

_,,-_._ _

_,_'_":!,// .................

International Comfort Products, LLC
Lewisburg, TN 37097 U.S.A.

Table of Contents

INSTALLER: Affix these instructions
on or adjacent to the furnace.
CONSUMER: Retain these

instructions for future reference.

1.SafeInstallationRequirements................... 3

2.Installation .................................. 4

3.Combustion &Ventilation Air .................... 8

4.Vent &Combustion Air Piping ................... 12

5.GasSupplyand Piping ........................ 30

6.ElectricalWiring ............................. 34

7.DuctworkandFilter ........................ 36

8. ChecksandAdjustments .................... 39

9.FurnaceMaintenance ....................... 41

10.SequenceofOperation& Diagnostics.......... 42

11.ConcentricVentTermination................. 46

TechSupportand Parts........................ 51

CARBON MONOXIDE POISONING AND FIRE
HAZARD.

Failure to follow safety warnings exactly could
result in serious injury, death, and/or property
damage.

This furnace is not designed for use in mobile
homes, trailers or recreational vehicles.

PrintedinU.S.A. 10/19/2004 440 01 1020 (05)

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: _ LP:

Which blower speed tap is used?
(Heating) (Cooling).

Temperature of Supply Air:

Temperature of Return Air:

(°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

YES

Condensate Drain Trapped? YES

NOE_

NO

NO

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

Blower Speed Checked? YES _ NO

All Electrical Connections Tight? YES _ NO

Gas Valve OK? YES _ NO

Measured Line Pressure When Firing Unit:

Calculated Firing Rate:(See Checks and Adjustments Sec-
tion).

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

Measured Manifold Gas Pressure:

Static Pressure (Ducts): Supply Air Return

Date of Start-Up:
CO?

CO2 ?

Dealer Comments:

E_ 44001102005

1. Safe Installation Requirements

FIRE, EXPLOSION, AND ASPHIXlATION HAZARD
Improper adjustment, alteration, service,

maintanence or installation could cause serious
injury, death and/or property damage.

Installation or repairs made by unqualified persons
could 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 agency that

is experienced in such work, is familiar with all
precautions and safety procedures required in

such work, and is equipped with the proper tools
and test instruments.

NOTE: This furnace is design-certified by the CSA International
(formerly AGA and CGA) for installation in the United States and

Canada. Refer to the appropriate codes, along with this manual,
for proper installation.

• 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. (Furnaces
can be converted to L.P. gas with approved kit.)

• Install this furnace only in a location and position as speci-
fied in "2. Installation"of these instructions.

• Provide adequate combustion and ventilation air to the fur-
nace as specified in "3. Combustion and Ventilation Air" of

these instructions.
Combustion products must be discharged outdoors. Con-

nect this furnace to an approved vent system only, as spe-
cified in "4. Vent and Combustion Air Piping" of these

instructions.
Never test for gas leaks with an open flame. Use a com-

mercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
"6. Gas Supply and Piping, Final Check"of these instruc-

tions.
Always install furnace to operate within the furnace's in-

tended temperature-rise range with a duct system which
has an external static pressure within the allowable range,
as specified in "Technical Support Manual" of these in-

structions.

• When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space con-
taining the furnace, the return air shall also be handled by a
duct(s) sealed to the furnace casing and terminating out-
side the space containing the furnace.

• A gas-fired furnace for installation in a residential garage
must be installed as specified in "2. Installation"of these

instructions.

• This furnace is not to be used for temporary heating of
buildings or structures under construction.

• This furnace is NOT approved for installation in mo-
bile homes, trailers or recreation vehicles.

• Seal around supply and return air ducts.

• Install correct filter type and size.

• Unit MUST be installed so electrical components are pro-
tected from direct contact with water.

Safety Rules

Your unit is built to provide many years of safe and dependable
service providing 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 encourages
installation of carbon monoxide alarms. There can be various

sources of carbon monoxide in a building or dwelling. The
sources could be gas-fired clothes dryers, gas cooking

stoves, water heaters, furnaces, gas-fired fireplaces, wood
fireplaces, and several other items.

Carbon monoxide can cause serious bodily injury and/or
death. 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.

Therefore, to help alert people of potentially dangerous ca rbon
monoxide levels, you should have a commercially available
carbon monoxide alarm that is listed by a nationally recog-
nized testing agency in accordance with Underwriters Labora-

tories Inc. Standard for Single and Multiple Station Carbon
Monoxide Alarms, ANSI/UL 2034 or the CSA 6.19-01 Resi-

dential Carbon Alarming Devices installed and maintained in
the building or dwelling concurrently with the gas- fired furnace

installation (see Note below). The alarm should be installed as
recommended by the alarm manufacturer's installation in-

structions.

B,

There can be numerous sources of fire or smoke in a building
or dwelling. Fire or smoke can cause serious bodily injury,
death, and/or property damage. Therefore, in order to alert
people of potentially dangerous fire or smoke, you should have

fire extinguisher and smoke alarms listed by Underwriters Lab-
oratories installed and maintained in the building or dwelling

(see Note below).

Note: The manufacturer of your furnace does not test any alarms

and makes no representations regarding any brand or type
of alarms.

C,

1.

To ensure safe and efficient operation of your unit, you should
do the following:

Thoroughly read this manual and labels on the unit. This

will help you understand howyour unit operates and the haz-

ards involved with gas and electricity.
Do not use this unit if any part has been under water. Im-

mediately call a qualified service technician to inspect the unit
and to replace any part of the control system and any gas con-

trol which has been under water.

3. Never obstruct the vent grilles, or any ducts that provide
air to the unit. Air must be provided for proper combustion
and ventilation of flue gases.

44001 102005 [_

FrozenWater PipeHazard

WATER DAMAGE TO PROPERTY HAZARD

Failure to protect against the risk of freezing could
result in property damage and/or personal injury.

Do not leave your home unattended for long periods
during freezing weather without turning off water

supply and draining water pipes or otherwise
protecting against the risk of frozen pipes and
resultant damage.

Your furnace is designed solely to provide a safe and comfortable
living environment. The furnace is NOT designed to ensure that

water pipes will not freeze. It is equipped with several safety de-
vices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.

If your furnace remains off for an extended time, the pipes in your
home could freeze and burst, resulting in serious water damage.

If the structure will be unattended during cold weather you should
take these precautions.

1. Turn off the water supply to the structure and drain the water
lines if possible and add an antifreeze for potable water to

drain traps and toilet tanks. Open faucets in appropriate
areas.

-or-

Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a service agency to call to
provide service, if required.

-or-

3. Install a reliable remote sensing device that will notify some-
body of freezing conditions within the home.

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 trap
on the furnace must be protected from freeze damage.(See
Figure 9 trough Figure 18)

1. Disconnect the 5/8" OD rubber hose from the vent drain fit-
ting that is located downstream of the combustion blower.
Insert a funnel into the hose and pour four(4) ounces of sani-
tary type (RV) antifreeze into the condensate trap. Recon-
nect the 5/8" OD rubber hose to the stub on the vent drain

fitting. Secure with the hose clamp.

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 Tran-
sition 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.

2. Installation

CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace or other

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

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

3reviously common-vented furnace, it may be

necessary to resize the existing vent and chimney to

3revent oversizing problems for the other

remaining appliance(s). See Venting and Combus-
tion Air Check in Gas Vent Installation section. This

furnace MUST be vented to the outside.

Location and Clearances

If furnace is a replacement, it is usually best to install the fur-
nace where the old one was. Choose the location or evalu-

ate the existing location based upon the minimum clearance
and furnace dimensions (Figure 3).

FROZEN AND BURST WATER PIPE HAZARD

Failure to protect against the risk of freezing could
result in property damage and/or personal injury.

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. If furnace 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")

1,

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.

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.

E_ 44001 1020 05

Typical Upflow Installation

Aluminumornon-rustingshield recommended.(See
VentTerminationShieldingfor dimensions).

Coupling on ends of

*8" Min. _l[q _I_ exhaust pipe. Total

20' Max. Inlet Pipe (not
in same _ _ usedon Single pipe & coupling out-

atmospheric <_ __4t_ Pipe model) side structure = 8"
zone

VentPipes MUSTbe

/]in.

supported
andVertically meatmospheric

* Increase minimum from 8" to 18" for cold climates (sustained temperatures below
0 ° F). 25-23-33

Typical Downflow Installation

See VentTermination
Shieldingin VentSection.

_1 14' _8" Min.

InletPipe _ [_ 20' Max.
(not used on _ _ in same
SinglePipe _ I,,,_ L, atmospheric zone

model) _

Vent Pip MUSTbq
support( 4orizonta
andVertically

Coupling on inside
and outside of wall

to restrain vent pipe

Min.
Max.

same
osphericzone

Increase minimum from 8" to 18" for cold climates (sustained temperatures

below O°F). 25-23-33a

CARBON MONOXIDE POISONING HAZARD.
Failure to follow safety warnings exactly could

result in serious injury, death, or property damage.
Do NOT operate furnace in a corrosive atmosphere

containing chlorine, fluorine or any other damaging
chemicals, which could shorten furnace life.

Refer to 3. Combustion & Ventilation Air section,
Contaminated Combustion Air for combustion air

evaluation and remedy.

Installation Requirements

1. Install furnace level.

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

3. Install the vent pipes as short as practical. (See Gas Vent
Installation section).

4. Do NOT install furnace directly on carpeting, tile or other com-
bustible material other than wood flooring.

5. Maintain clearance for fire safety and servicing. A front clear-
ance of 30" is minimum for access to the burner, controls and

filter. See clearance requirements in Figure 3 or.

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

7. Residential garage installations require:

• Burners and ignition sources installed at least 18" (457 mm)
above the floor.

8.

Furnace must be located or physically protected from pos-
sible damage by a vehicle.

If the furnace is to be suspended from the floor joists in a base-
ment or a crawl space or the rafters in an attic, it is necessary
to use steel pipe straps or an angle iron frame to attach the
furnace. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The

preferred method is to use an angle iron frame bolted to the
rafters or joists.

This furnace may be used for construction heat provided that all
the following conditions are met:

The furnace is permanently installed with all electrical wir-
ing, piping, venting and ducting installed according to these

installation instructions. A return air duct is provided, sealed

to the furnace casing, and terminated outside the space

containing the furnace. This prevents a negative pressure
condition as created by the circulating air blower, causing a
flame rollout and/or drawing combustion products into the

structure.

• The furnace is controlled by a thermostat. It may not be "hot

wired" to provide heat continuously to the structure without
thermostatic control.

Clean outside air is provided for combustion. This is to mini-
mize the corrosive effects of adhesives, sealers and other
construction materials. It also prevents the entrainment of
drywall dust into combustion air, which can cause fouling
and plugging of furnace components.

I • The temperature of the return air to the furnace must be

maintained between 55 ° F and 80 ° F, with no evening set-
back or shutdown. The use of the furnace while the struc-

ture is under construction is deemed to be intermittent

operation per our installation instructions.
The air temperature rise is within the rated rise range on the

furnace rating plate, and the firing rate has been set to the
rating plate value.

The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.

The furnace, ductwork and filters are cleaned as necessary

to remove drywall dust and construction debris from all

HVAC system components after construction is completed.

• Verify the gurnace operating conditions including ignition,

input rate, and temperature rise and venting, according to

the manufacturer's instructions.

44001 102005 [_

Dimensions & Clearances

17/8

Unit

Capacity
N9MP1050B12B
NgMP1075B12B

NgMP1080F16B
N9MP1100F14B

NgMP1100J20B
NOMP1125J20B

NOMP2050B12B
NOMP2075B12B

NgMP2080F16B
NgMP2100F14B
NOMP2100J20B

NOMP2125J20B
*9MPD050F12B

*9MPD075F12B

*9MPD080J16B
*9MPD100J14B

*9MPD100J20B

*9MPD125L20B

TOP

r-- ]

]

LEFT SIDE _-_ _

TRAP(COUNTERFLOW)_

GASt_

VENT )

AIR INTAKE _" )

(ALTERNATE)_

413/16_

TRAP
UPFLOWtHORIZONTAL_

THERMOSTA_=_ 7-

215/8_ 47/

24

11/4

/ ELECTRICAL

11/16

31

2(, f8

3/4

1/1

113/1

_A_

B_

FRONT

Drawing is representative,
but some models may vary

BOTTOM

-- 231/8 _,_ 37/8

Cabinet Bottom

ALL DIMENSIONS IN INCHES

MINIMUM CLEARANCES TO

COMBUSTIBLE MATERIALS FOR ALL UNITS

REAR 0
FRONT (combustion air openings in 3"

furnace and in structure)

Required For Service *24"

ALL SIDES Of SUPPLY PLENUM 1"
SIDES O
VENT O
TOP OF FURNACE 1"

*30" clearancerecommendedfor casingremoval.

Horizontalposition:Linecontactispermissibleonlybetween

linesformed by intersectionsoftop and two sidesoffurnace
jacket,andbuildingjoists,studs orframing.

NOTE: Evaporator "A" coil drain pan dimensions

may vary from furnace duct opening size, AIways
consult evaporator specifications for duct size

requirements,
Furnace is designed for bottom return or side

return.

Return air through back of furnace is NOT allowed.

281/2

/

16_/ _ 181/2

23/8 --

1r/16_ /

/ RIGHT SIDE

GAS\

/

//TRAP (COUNTERFLOW)

_I_ELECTRICAL

AIRINTAKE

/(ALTERNATE)

413116_ _'_/VENT

I1111_ _ TRAPowIHORIZONTAL

19114

L k(_

47/8 l_215/8

24

17/8

25-23-36b

E_ 44001 1020 05

Installation Positions

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 at-

tached 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 at-

tached to the back of the furnace.

Furnace Installation Considerations

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 follow-
ing:

Condensate Trap 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 6" below the furnace is re-
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

1 ,

level to within /4' from front to back and from side to side for upflow
and downflow installations or top to bottom for horizontal installa-
tions.

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.

Horizontal Furnace Installation

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.

Vent

Typical Horizontal Installation

Inlet Pipe (not used on Single Pipe model)

d_

Condensate
Rap

25-23-34

NOTE: 6" bottomclearance requiredfor condensatetrap.

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 rigidly attach the furnace to prevent
movement. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The pre-
ferred method is to use an angle iron frame bolted to the rafters or

joists. (Take caution to allowdoor panels to be removed for mainte-

nance)
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: 6" 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.

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 4.
This furnace MUST NOT be installed directly on carpeting or tile or

other combustible material other than wood flooring or supports.
For horizontal installation over a finished living space. A field fabri-

cated auxiliary drain pan with drain pipe is required to prevent
damage by overflow due to blocked condensate drain.

44001 102005

3. Combustion & Ventilation Air

For Single Pipe Installation

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

And Combustion Air Check in "4. Gas Vent Installation"Section in
this manual.

CARBON MONOXIDE POISONING HAZARD.

Failure to provide adequate combustion and
ventilation air could result in death and/or personal
injury.

Use methods described here to provide
combustion and ventilation air.

Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-

ings for supplying combustion and ventilation air must comply with
the gas codes, or in the absence of local codes, the applicable na-

tional codes.

Combustion and ventilation air must be supplied in accordance
with one of the following:

1. Section 8.3, Air for Combustion and Ventilation, of the National
Fuel Gas Code, (NFGC), ANSI Z223.1-2002/NFPA 54-2002

in the U.S.,

2. Sections 7.2, 7.3, 7.5, 7.6, 7.7, and 7.8 of National Standard of
Canada, Natural Gas and Propane Installation Code

(NSCNGPIC), CSA B149.1-00 in Canada,

3. Applicable provisions of the local building code.

Outdoor Combustion Air Method

A space having less than 50 cubic feet per 1,000 BTUH input rating
for all gas appliances installed in the space requires outdoor air for

combustion and ventilation.

Air Openings andConnecting Ducts

1. Total input rating for all gas appliances in the space MUST be
considered when determining free area of openings.

2,

3.

4.

5.

Connect ducts or openings directly to the outdoors.
When screens are used to cover openings, the openings

MUST be no smaller than 1/4" mesh.
The minimum dimension of air ducts MUST NOT be less than

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

ver, assume a 20% free area for wood and 60% for metal.
Screens shall have a mesh size not smaller than 1/4".

Requirements

1. Provide the space with sufficient air for proper combustion and
ventilation of flue gases using horizontal or vertical ducts or
openings.

2. Figure 5 illustrates how to provide combustion and ventilation
air when two permanent openings, one inlet and one outlet, are

used.

This furnace can NOT be common vented or connected to any
type B, BW or Lvent or vent connector, nor to any portion of a facto-
ry- built or masonry chimney. If this furnace is replacing a previous-
ly common-vented furnace, it may be necessary to resize the
existing vent and chimney to prevent oversizing problems for the a.
other remaining appliance(s). See "Venting and Combustion Air

Check"in this section, This furnace MUST be vented to the out-
side. b.

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

One opening MUST commence within 12" of the floor
and the second opening MUST commence within 12" of
the ceiling.

Size openings and ducts per Table 1.

ThisinstallationNOTapprovedinCanada

GasVent

, Gable V_/)

;pace

MinimumOneInletandOneOutletAirSupplyisRequired

MaybeinandCombinationShown

InletAirOpeningMustbeWithin12"(300mm)offloor
OutletAirOpeningMustbeWithin12"(300mm)ofceiling
(1)1 SquareInch(6cm2)per4000BTUH
(2)1 SquareInch(6cm2)per2000BTUH

c. Horizontal duct openings require 1 square inch of free

2

area per 2,000 BTUH (1,100 mm /kW) of combined input
for all gas appliances in the space (see Table 1).

Gas Vent _Gable Vent

_-Ventilated Attic_

(1) TopAboveInsulation_

II " SoffitVent ._

SoffitVen, I _utlet Air(1) Ou,le="t_

II _ Air(1)

Furnace N_Oa_

_., _&. _ _ Inlet

Air(2) Inlet

Air(1)

d,

-, i I I,n,e`

__= _ _ Atr(2)

Vertical duct openings or openings directly communicat-
ing with the outdoors require 1 square inch of free area

2

per 4,000 BTUH (550 mm /kW) for combined input of all
gas appliances in the space (see Table 1).

E_ 44001102005

3. Whenonepermanentoutdooropeningisused,theopening
requires:

a. 1sq.inoffreeareaper3,000BTUH(700mm2/kW)for

combinedinputofallgasappliancesinthespace(see
Table1) and

b. notlessthanthesumoftheareasofallventconnectorsin

thespace.

Theopeningshallcommencewithin12"ofthetopoftheenclo-
sure.Appliancesshallhaveclearancesofatleast1"fromthesides
andbackand6"fromthefront.Theopeningshalldirectlycommu-

nicatewiththeoutdoorsorshallcommunicatethroughaverticalor
horizontalducttotheoutdoorsorspaces(crawlorattic)thatfreely

communicatewiththeoutdoors.

4. Combination of Indoor and Outdoor Air shall have:

a.

b.

C.

Indoor openings that comply with the Indoor Combus-

tion Air Method below and

Outdoor openings located as required in the Outdoor
Combustion Air Method above and

Outdoor openings sized as follows.

1) Calculate the Ratio of all Indoor Space volume divid-
ed by required volume for Indoor Combustion Air Meth-
od.

2) Outdoor opening size reduction Factor is I minus the
Ratio in 1) above.

3) Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above

multiplied by reduction Factor.

Area

BTUH MinimumFree Area Requiredfor EachOpening or Ductto Outdoors

TwoVerticalDuctsor RoundDuct

Input TwoHorizontalDucts SingleOpening Openings (sq.in./4,000

Rating (sq. inJ2,000BTUH) (sq. in./3,000BTUH) (sq.in./4,000 BTUH) BTUH)

50,000 25sq. in. 16.7sq. in. 12.5sq. in. 4"
75,000 37.5 sq. in. 25sq. in. 18.75 sq. in. 5"

100,000 50 sq. in. 33.3sq. in. 25sq. in. 6"
125,000 62.50sq. in. 41.7sq. in. 31.25 sq. in. 7"
150,000 75sq. in. 50sq. in. 37.5 sq. in. 7"

EXAMPLE: Determining Free Area

Furnace Water Heater Total Input
100,000 + 30,000 (130,000 + 4,000) 32.5 Sq. In. Vertical
Furnace Water Heater Total Input
100,000 + 30,000 (130,000 + 2,000) 65 Sq. In. Horizontal

Indoor Combustion Air The Standard Method may be used, if the space has no less vol-

ume than 50 cubic feet per 1,000 BTUH input rating for all gas ap-
pliances installed in the space. The standard method permits

indoor air to be used for combustion and ventilation air.

Standard and Known-Air-Infiltration Rate Methods
© NFPA&AGA

Indoor air is permitted for combustion and ventilation, if the Stan-
dard or Known-Air-Infiltration Rate Method is used.

CARBON MONOXIDE POISONING HAZARD.

Failure to supply adequate combustion air could
result in death and/or personal injury.

Most homes will require additional air from
outdoors for combustion and ventilation. A

space with at least 50 cubic feet per 1,000 BTUH
input rating or homes with tight construction
may need outdoor air, supplied through ducts, to
supplement air infiltration for proper

combustion and ventilation of flue gases.

The Known Air Infiltration Rate Method shall be used if the in-
filtration rate is known to be less than 0.40 air changes per hour

(ACH) and equal to or greater than 0.10 ACH. Infiltration rates
greater than 0.60 ACH shall not be used. The minimum required

volume of the space varies with the number of ACH and shall be
determined per Table 2 or Equations 1 and 2. Determine the
minimum required volume for each appliance in the space, and

add the volumes together to get the total minimum required vol-
ume for the space.

44001 102005 [_

iiiiiiiiiiiiiiiiiiiii_i;_;:_i:_i:_i:_i:_i:_i;!;!_;!_;;:_i!_i_;_!_!_i!;iiiiii_iiiiiiiiiiiiiiiiiiii_ii_i_!_!i!_i_i_i_i_i_i_i_i_i_i_i_!i!_!iii

ACH

0.60

0.50

0.40

0.30

0.20

0.10

0.00

MINIMUMSPACEVOLUMEFOR100%COMBUSTIONANDVENTILATIONAIRFROMINDOORS(ft3)

Other Than Fan-AssistedTotal

(1,OOO'sBtuh)

30 40 50 50 125 150

1,050 1,400 1,750 1,250 3,125 3,750
1,260 1,680 2,100 1,500 3,750 4,500
1,575 2,100 2,625 1,875 4,688 5,625

2,100 2,800 3,500 2,500 6,250 7,500
3,150 4,200 5,250 3,750 9,375 11,250
6,300 8,400 10,500 7,500 18,750 22,500

NP NP NP NP NP NP

NP = Not Permitted
Table 2 Minimum Space Volumes were determined by using the •

following equations from the National Fuel Gas Code ANSI
Z223.1/NFPA 54-2002, 8.3.3.2:

1. For other than fan-assisted appliances such as a draft

hood-equipped water heater,

21 ft 3 ( I other )

Volume other - ACH 1000 Btu / hr •

2. For fan-assisted appliances such as this furnace,

15ft3 ( [fan )

Volume fan = ACH 1000 Btu / hr

Fan-assistedTotal

(1,000'sBtuh)

75 100
1,875 2,500
2,250 3,000
2,813 3,750

3,750 5,000
5,625 7,500

11,250 15,000

NP NP

An attic or crawl space may be considered a space that freely
communicates with the outdoors provided there are adequate
ventilation openings directly to outdoors. Openings MUST re-
main open and NOT have any means of being closed off. Ven-
tilation openings to outdoors MUST be at least I square inch

of free area per 4,000 BTU H of total input rating for all gas ap-
pliances in the space.

In spaces that use the Indoor Combustion Air Method, in-
filtration should be adequate to provide air for combustion,
ventilation and dilution of flue gases. However, in buildings

with unusually tight construction, additional air MUST be pro-

vided using the methods described in section titled Outdoor

Combustion Air Method:

Unusually tight construction is defined as Construction with:

If:

[ other = combined input of all other than fan-assisted

appliances in Btu/hr

] fan = combined input of all fan-assisted appliances in Btu/hr

ACH = air changes per hour (ACH shall not exceed 0.60.)

The following requirements apply to the Standard Method and to
the Known Air Infiltration Rate Method.

• Adjoining rooms can be considered part of a space, if there

are no closable doors between rooms.
Combining spaces on the same floor level. Each opening

shall have a free area of at least 1" 2/1,000 BTUH (2,000
mm2/kW) of the total input rating of all gas appliances in the
space, but not less than 100 in2 (0.06 m2). Once opening
shall commence within 12" (300 ram) of the ceiling and the
second opening shall commence within 12" (300 ram) of the

floor. The minimum dimension of air openings shall be at least
3" (80 ram).

Combining spaces on different floor levels. The volumes of
spaces on different floor levels shall be considered communi-
cating spaces if connected by one or more permanent open-
ings in doors or floors having a free area of at least 2" 2/1,000
Btuh (4,400 mm2/kW) of total input rating of all gas ap-
pliances.

1. Walls and ceilings exposed to the outdoors have a con-
tinuous, sealed vapor barrier. Openings are gasketed or

sealed and

2,

3.

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.

Ventilation Air

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 tempera-

ture across the heat exchanger MUST not fall below 60 ° so that
flue gases will not condense excessively in the heat exchanger.
Excessive condensation will shorten the life of the heat exchanger

and possibly void your warranty.

Venting and Combustion Air Check

NOTE: When an existing Category I furnace is removed or re-
placed, the original venting system may no longer be sized to prop-

erly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOL-

LOWING CHECK.

[_ 44001 1020 05

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each

appliance connected to the venting system being
placed into operation, could result in carbon
monoxide poisoning or death:

The following steps shall be followed for each
appliance connected to the venting system being

placed into operation, while all other appliances
connected to the venting system are not in
operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI

Z223,1/NFPA 54 or CSA B149, 1, Natural Gas and
Propane Installation Code and these instructions. Deter-

mine that there is no blockage or restriction, leakage,

corrosion and other deficiencies which could cause an

unsafe condition.

3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.

4. Close fireplace dampers.

5. 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 are

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

6. Followthe lighting instructions. Place the appliance being

inspected into operation. Adjust the thermostat so

appliance is operating continuously.

7. Test for spillage from draft hood equipped appliances at
the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle. (Figure 6)

8. If improper venting is observed, during any of the above
tests, the venting system must be corrected in

accordance with the National Fuel Gas Code, ANSI

Z223,1/NFPA 54 and/or CSA B149. 1, Natural Gas and
Propane Installation Code.

9. After it has been determined that each appliance
connected to the venting system properly vents when

tested as outlined above, return doors, windows, exhaust
fans, fireplace dampers and any other gas-fired burning
appliance to their previous conditions of use.

For Two Pipe Installation

Vent Check

Vent Pipe--.--_l [ / Draft Hood

Typical Gas // _'_

WaterHeateq,/ i i ._ Marc.

I I

If flame pulls towards draft hood, this indicates sufficient
venting.

This furnace can NOT be common vented or connected to any
type B, BW or Lvent or vent connector, nor to any portion of a facto-
ry-built or masonry chimney. Ifthis furnace is replacing a previous-
ly 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 this section, This furnace MUST be vented to the out-

side.

44001 102005 E_

4. Vent and Combustion Air Piping

CARBON MONOXIDE POISONING HAZARD.

Failure to properly vent this furnace could result in
death and/or personal injury.

Use methods described here to provide combustion
and ventilation air.

SinglePipe(N9MP1Models)

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" VentingandCombus-
tion Air Checl(' in this manual.

Direct Vent (N9MP2 Models)

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

same atmospheric pressure zone as the vent pipe. See Confined
Space Installation in the Combustion and Ventilation Air in this

manual.

Dual Certified (*9MPD Models)

This furnace is certified as a category [V 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 com-
bustion. The INLET air pipe is optional. If combustion air comes

from inside the structure, adequate make u p air MUST be provided
to compensate for oxygen burned. See Confined Space Installa-
tion in the Combustion and Ventilation Air chapter. If combus-

tion air is drawn from outside the structure, it MUST be taken from
the same atmospheric pressure zone as the vent pipe.

Contaminated Combustion Air

Installations in certain areas or types of structures could cause ex-
cessive exposure to contaminated air having chemicals or halo-

gens that will result in safety and performance related problems
and may harm the furnace. These instances must use only out-

door air for combustion.
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 outdoor air

for combustion.

• 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 tetrachloride.

• Halogen type refrigerants.

• Cleaning solvents (such as perchloroethylene).

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid.

• Sulfuric Acid.

• Solvent cements and glues.

• Antistatic fabric softeners for clothes dryers.

• Masonry acid washing materials.

Vent and Combustion Air Piping Guidelines

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 American
National Standard Institute and American Society for Testing and

Materials (ANSI/ASTM) standards.

• PipeandFittings-ASTMD1785, D2241,D2466, D2661,
D2665, F-891, F-628

• PVC Primer and Solvent Cement - ASTM D2564

• Procedure for Cementing Joints - Ref ASTM D2855

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.

1. Determine the best routing and termination for the vent pipe
and air inlet pipe by referring to all of the instructions and
guidelines in this Section.

2. Determine the size required for the vent pipe and air inlet
pipe.

3. Loosely assemble all venting parts without adhesive (pipe

joint cement) for correct fit before final assembly.

4. Use of vertical piping is preferred because there will be
some moisture in the flue gases that may condense as it
leaves the vent pipe (See Speciallnstruction ForHorizontal

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 ° F. 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 of the
chimney.

[_ 44001102005

• 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 & Figure 8
are maintained.

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 nuisance

tripping of the pressure switch.

Piping Insulation Guidelines

NOTE: Use closed cell, neoprene insulation or equivalent. If Fiber-
glass or equivalent insulation is used it must have a vapor barrier.
Use Rvalues of 7 upto 10', R-11 if exposure exceeds 10'. If Fiber-
glass 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 Vent Pipe

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 oroutlet side), and number of 90 ° elbows required. Two

45 ° elbows can be substituted for one 90 ° elbow. The elbow or el-
bows used for venttermination outside the structure ARE counted,

including elbows needed to bring termination above expected
snow levels. The elbow inside the furnace on the *9MPD IS NOT

included in the count.

Pipe Diameter Table

N9MP1 & *9MPD Models

50,000, 75,000 & 80,000 Btuh Furnaces

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

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

100,000 Btuh Furnace

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

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

Long Vent Kit (See Tech. Manual)

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.

i!ii!ii!i

Pipe Diameter Table

N9MP2 Models

50,000 & 80,000 Btuh Furnaces

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

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

75,000 Btuh Furnaces

25' & (3) 90° elbows with 2" PVC pipe or
40' & (5) 90 ° elbows with 2" PVC pipe &

Long Vent Kit (See Tech. Manual) or

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

100,000 Btuh Furnace

40' & (5) 90° elbows with 3" PVC pipe or
70' & (5) 90 ° elbows with 3" PVC pipe &

Long Vent Kit (See Tech. Manual)

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 11" in this manual.

Vent Termination Clearances

CARBON MONOXIDE POISONING, FIRE AND

EXPLOSION HAZARD.
Failure to properly vent this furnace could result in

death, personal injury and/or property damage.
Inlet and outlet pipes may NOT be vented directly

above each other.

1. Determine termination locations based on clearances spe-
cified in following steps and as shown in Figure 7, Figure 8,
Figure 20, through Figure 28.

For "Concentric Termination Kit"clearances, see Figure 46,
Figure 47, Figure 48, Figure 49 and Figure 50 in "Section 10"

in this manual.

2. For Single Pipe Installation, models N9MP1 or *9MPD, refer
to Figure 8 for vent termination clearances.

3. For Direct Vent Installation, models N9MP2 or*9MPD, refer
to Figure 7 for vent termination clearances.

44001 102005 E_

Item Clearance Description

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

anticipated snow level

B Clearance to a window or door that may he opened

C Clearance to a permanently closed window

D Vertical clearance to a ventilated soffit located above the

terminal within a horizontal distance of 2' (61cm) from the
centedine of the terminal

E Clearance to an unventilated soffit

F Clearance to an outside corner

O Clearance to an inside corner

H Clearance to each side of the centedine extended above

electrical meter or gas service regulator assembly

I Clearance to service regulator vent outlet

J Clearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

K Clearance to a mechanical air supply inlet

L Clearance under a veranda, porch, deck, or balcony

M Clearance to each side of the centerline extended above or

below vent terminal of the furnace to a dryer or water heater
vent, or other appliance's direct vent intake or exhaust.

Canadian Installation (1)

12" (30cm)#

6" (15 cm) for appliances _< 10,000 BTUH (3kW), 12" (30
cm) for appliances > 10,000 Btuh (3 kW) and _<100,O00 Btub
(30 kW), 36" (91 cm) for appliances > 100,000 Btab (30 kW)

3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly

3' (91 cm)

6" (15cm)forappliances_<lO,OOOBTUH(3kW),9" (23cm)
forappliances> 10,000Btah(3kW) and _<100,000Btah(30

kW) and _<50,000Btuh(15kW), 12" (30 cm) for appliances
> 50,000Btah(15kW)

6' (1.83m)

12" (30 cm) +

12" (30 cm)

N Clearance from a plumbing vent stack 3' (91 cm)

(1.) In accordance wifh the currem CSA B149.1, Natural Gas and Propane Installation Code
(2.) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
# 18" (46 cm) above roof surface

+ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

U.S. Installation (2)

12" (30cm)

6" (15 cm)for appliances_<10,000 BTUH (3kW),9" (23 cm)

for appliances>10,000Btuh(3 kW)and_<50,000Btuh(15

kW),12" (30cm)for appliances>50,000Btub(15 kW)

3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly

6" (15cm)forappliances_<lO,OOOBTUH(3kW),9" (23cm)

for appliances > 10,000 Btah (3 kW) and _<50,000 Btuh (15

kW), 12" (30 cm) for appliances > 50,000 Btuh (15 kW)

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

12" (30 cm)

3' (91 cm)

For clearances not specified in AN SI Z223.1/N FPA 54 or C SA B149.1, clearances shall be in accordance with local installation codes and the requirements ofthe gas supplier and the manufactare's installatio

instructions.

Notes:

1. The vent for this appliance shall not terminate
a. Over public walkways; or
b. Near soffit vents or crawl space veins or other areas where condensate or vapor could create a nusiance or hazard or property damage; or
c. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.

2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustiob products of adjacent vents.

Recircula0on can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.

44001 1020 05

Item Clearance Descriptions

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

anticipated snow level

B Clearance to a window or door that may be opened

Canadian Installation (1)

12" (30cm)#

6" (15 cm) for appliances _< 10,000 BTUH (3kW), 12" (30
cm) for appliances > 10,000 Btuh (3 kW) and _<100,000 Btuh
(30 kW), 36" (01 cm) for appliances > 100,000 Btub (30 kW)

C Clearance to a permanently closed window *

D Vertical clearance to a ventilated soffit located above the *

terminal within a horizontal distance of 2' (61cm) from the
centedine of the terminal

E Clearance to an unventilated soffit *

F Clearance to an outside corner *

G Clearance to an inside comer *

H Clearance to each side of the centedine extended above

electrical meter or gas service regulator assembly

I Clearance to service regulator vent outlet

J Clearance to non-mechanical air supply inlet to building or

the combustion air inlet to any other appliance

K Clearance to a mechanical air supply inlet

L Clearance under a veranda, porch, deck, or balcony

M Clearance to each side of the centedine extended above or *

below vent terminal of the furnace to a dryer or water heater
vent, or other appliance's direct vent intake or exhaust.

N Clearance from a plumbing vent stack

3' (91 cm) within 15' (4.5 m) above the meter/regulator
assembly

3' (01 cm)

6" (15cm)forappliances_<10,OOOBTUH(3kW),12" (30
cm)for appliances> 10,000Btub(3kW) and _<100,000Btuh

(30 kW),36" (91 cm)for appliances> 100,000Btuh(30 kW)
6' (1.83m)

12" (30 cm) +

3' (91 cm)

U.S. Installation (2)

12" (30 cm)

4' (1,2 m) below or to the side of the opening. 1' (30 cm)
above the opening.

3' (91 cm) within 15' (4.fi m) above the meter/regulator
assembly

4' (1.2 m) below or to the side of opening: 1' (30 cm) above
opening.

3' (01 cm) above if within 10' (3m horizontally)

3' (91 cm)

(1.) In accordance with the currenl CSA B149.1, Natural Gas and Propane Installation Code
(2,) In accordance with the current ANSI Z223.1/NFPA fi4, Nafional Fuel Gas Cede

# 18" (46 cm) above roof surface
+ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture's
installation instructions.

Notes:

1, The vent for this appliance shall not terminate

a. Over public walkways; or
b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nusiance or hazard or property damage; or

c. Where condensate vapor could cause damage or could be detrimental to the operafion of regulators, relief valves, or other equipment.

2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combusfiob products of adjacent vents.

Recirculafion can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.

44001 102005 E_

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 fit-

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

The startup of a new furnace will involve a cycle or two of the fur-
nace to properly prime the condensate trap with water. Until the

trap is fully primed, some condensate will be pulled into the com-
bustion blower. The furnace may cycle on the pressure switch con-

nected to the plastic transition box due to condensate buildup.
After the trap is primed, the condensate will start draining from the

furnace. The combustion blower will clear out any remaining con-
densate in the blower housing through the vent fitting downstream

of the blower. Note that the condensate trap can also be primed by
pouring water into the 1/2" drain hose. Remove the1/2 " ID drain
hose from either the gutter or the white PVC Tee Trap. Using a fun-
nel pour eight (8) ounces of water into 112" ID drain hose.Water will

flow through the drain hose and into the condensate drain trap.
This will prime both the vent and the transition sides of the trap. Re-

connect the 1/2, ID drain hose to the original component, either the
gutter or the PVC Tee Trap.

The condensate drain trap supplied with the furnace MUST be
used. The drain connection on the condensate drain trap is sized
for 3/4" PVC or CPVC pipe, however alternate 1/2" CPVC (nominal

5/8" O.D.) or vinyl tubing with a minimum inner diameter (I.D.) of
5/8" may also be used, as allowed by local codes. Alternate drain

pipes and hoses may be used as allowed by local codes.

The drain line must maintain a I/4" per foot downward slope toward
the drain. 114"per foot is recommended. Installation of an overflow
line is recommended when the 114" per foot slope to the conden-

sate drain cannot be maintained. See Figure 18 for proper routing
and installation of the overflow.

DO NOT trap the drain line in any other location than at the con-
densate drain trap supplied with the furnace.

FROZEN AND BURST WATER PIPE HAZARD
Failure to do so could result in burst water pipes,

serious property damage and/or personal injury.
If a condensate pump is installed, a plugged

condensate drain or a failed pump may cause the
furnace to shut down. Do not leave the home

unattended during freezing weather without turning
off water supply and draining water pipes or
otherwise protecting against the risk of frozen pipes.

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.

2. A plugged condensate drain line or a failed condensate
pump will allow condensate to spill. If the furnace is installed
where a condensate spill could cause damage, it is recom-

mended that an auxiliary safety switch be installed to pre-
vent operation of the equipment in the event of pump failure
or plugged drain line. If used, an auxiliary safety switch
should be installed in the R circuit (low voltage) ONLY.

3. If the auxiliary switch in the condensate pump is used, the
furnace may shut down dueto a blocked condensate line or
failed pump. To prevent frozen water pipes see the "Frozen

Water Pipe Hazard" section on Page 4 of this manual.

Condensate Drain Trap Freeze Protection

Special precautions MUST be made if installing furnace in an area
which may drop below freezing. This can cause improper opera-
tion or damage to the equipment. If the the furnace environment
has the potential of freezing, the drain trap and drain line must be
protected. Use 3 to 6 watt per foot at 11 5 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.

[_1 440011020 05

Upflow Installations Top Vent

ONLY

Vent Drain

& Clamps

Pressure Switch Detail

(Optional)

DrainTee

DrainTube
Black Rubber

112"ID& Clamps

Corrugated
s/8"ID & Clamps

Drain Connector Black PVC

3/4"PVC X l/z" CPVC
(Looseparts bag)

Casing Grommet

Black Rubber

S/8"ID
(Looseparts bag)

DrainLineVentTee314"PVC or
1/2"CPVC(Fieldsupplied)

Upflow Installations Top Vent (SeeFigure 9)

Remove plug from the side of the furnace casing where Drain Tu be
will exit.

Install casing grommet (black rubber 5/8" ID grommet - in loose
parts bag)

Install the 1/2" CPVC street elbow on discharge of Trap
Install the black PVC tube connector (3/4" PVC x 1/2" CPVC from

loose parts bag) as shown in the illustration above.
Cut the black Drain Tube (5/8" ID - in loose parts bag) to length to

fit between Trap and tube connector through grommet.
Clamp both ends of the Drain Tube using clamps provided.

le Pressure Switch

Black Rubber

3/16" ID

StreetEIbow

/'CPVC

(Looseparts bag)

DrainTube BlackRubbers/8" ID &Clamps

Cut length to fit (Loosepartsbag)

25-24-42

Glue the CPVC street elbow to the Trap using appropriate cleaner
and solvent cement.

Connect the Tee trap and the main drain line exiting the casing as
shown Figure 18.

Note: It is recommended that all PVC piping and fitting connec-
tions be fit up and inspected before final cementing. Trap must be

primed before operation. Verify all condensate drain connec-
tions are securely clamped. A coupling and clamps (in loose part
bag) may be installed as shown for future servicing of the vent sys-

tem.

44001 102005 E_

Plastic Cap
Yellow or black

Upflow Installations Vent thru Left Side

ONLY

Coupling & Clamps

Either:ThePVC

VentDrain
&Clamps Drain Teeor a field

supplied 2" PVC Te_

X

Dual Pressure Switch Detail

\

TeeTrap White PVC

(loosepartsbag)

DrainTube

Black Rubber

1iZ" ID & Clamps

DrainConnector Black PVC
3/4"PVCX 1/2"CPVC

(Loosepartsbag)

Casing Grommet

Black Rubber

s/8" ID
(Loose partsbag)

oj

Single Pressure Switch

3 t_

DrainLine VentTee /4 PVCor 1/2"CPVC(Field supplied)

Relief Tube

3/16" ID

DrainTube

SIDE VIEW

/_Rotate downward

NOTET Bw]t-in channel will
be angled 5° to 10° also.

25-24-43

Upflow Installations Vent thru Left Side (See Figure 10)

Remove Drain Tee from inducer discharge and remove black
Drain Tube (1/2" ID) from bottom of Drain Tee. (*9MPD models
only)

Install Vent Pipe grommet in side of casing.
Cut an appropriate length of 2" PVC pipe long enough to exit the

cabinet and connect the vent drain to either:

• A standard field supplied 2" PVC tee (N9MP1 and 2 models),
or

• A 2" PVC coupling fastened onto the Drain Tee (*9MPD mod-
els)

Install Tee trap into bottom of tee.
Install the 112" CPVC street elbow on discharge of Trap
Install the black PVC drain connector (3/4" PVC x 1/2" CPVC from

loose parts bag) as shown in the illustration above.

Cut the black Drain Tube (5/8" ID - in loose parts bag) to length to
fit between Trap and tube connector through grommet.

Clamp both ends of the Drain Tube using clamps provided.

Glue the CPVC street elbow to the Trap using appropriate cleaner
and solvent cement.

Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 18.

Note: It is recommended that all PVC piping and fitting connec-
tions be fit up and inspected before final cementing. Both the in-

ternal Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be

installed as shown for future servicing of the vent system.

[_ 44001 1020 05

PlasticCap
Yelloworblack

VentDrain
&Clamps

Relief Tube
Black Rubber

3/16" ID

DrainTube
Corrugated

Sls"

Barbed Coupling
(loose parts bag)

SIDE VIEW

,,,_otat e downward

NOTE.TBuilt-inchannelwill
heangled 5° to10° also.

All Models Vent thru Right Side

On Some Models
ONLY

oj

Dual Pressure Switch

All Models Vent thru Right Side (SeeFigure 11)

Disconnect the black Drain Tube between the drain vent and the
Trap.

Rotate the inducer 180 ° for a right side vent after loosening the 4
inducer attachment screws. Reinstall and retighten the inducer

screws to 20" pounds torque.
Using the 1/2" OD barbed coupling in the loose parts bag connect

1 ,

together with the 2 short /2' ID elbowtubes and connect the lower
discharge port of the vent drain to the Trap. Secure all connections

with clamps.
Install the vent pipe grommet into the casing
Cut an appropriate length of 2" PVC pipe long enough to exit the

cabinet and connect the vent drain to either:

• A standard field supplied 2" PVC tee (N9MP1 and 2 mod-
els), or

• A 2" PVC coupling fastened onto the Drain Tee (*9MPD
models)

Install Tee Trap into bottom section of Tee.
Remove plug from the side of the furnace casing where Drain Tu be

will exit.

Either: The PVC
DrainTeeor afield

supplied 2" PVC Tee

Single Pressure Switch Detail

White PVC

(looseparts bag)

ElbowsTubes (2)

Rubber1/2"ID &Clamps

(looseparts bag)

DrainLine VentTee3/4"PVC

CPVC(Field supplied)

314"PVCX 1/2" CPVC
(Loosepartsbag)

Casing Grommet

"Black Rubber sis" CPVC

(Loose parts bag) 25-24-44

Install casing grommet (black rubber 5/8" ID grommet - in loose
parts bag)

Install the 1/2" CPVC street elbow on discharge of Trap
Install the black PVC tube connector (3/4" PVC x 1/2" CPVC from

loose parts bag) as shown in the illustration above
Cut the black Drain Tube (5/8" ID - in loose parts bag) to length to

fit between Trap and tube connector through grommet.
Clamp both ends of the Drain Tube using clamps provided.
Glue the CPVC street elbow to the Trap using appropriate cleaner

and solvent cement.

Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 18.

Note: It is recommended that all PVC piping and fitting connec-
tions be fit up and inspected before final cementing. Both the in-

ternal Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be

installed as shown for future servicing of the vent system.

44001 102005 E_

PlasticCap
Yelloworblack

Downflow Left Side Vent and Trap

VentDrain
& Clamps

Coupling&Clamps
(Optional)_

Either: The PVC

Drain Teeora field
supplied 2" PVC Tee

TeeTrapWhite PVC

(loosepartsbag)

Single Pressure Switch Detail

Elbow Tube
Black Rubber

I/Z" ID& Clamps

MoveCapsto
topof trap

DrainTubeCorrugated sis"ID

Cut at straight section

I

Leaveroomfor clamp

Cut Here (loose

Downflow Left Side Vent and Trap (SeeFigure 12)

Remove the inducer mounting screws, rotate the inducer 180 °
and retighten the inducer screws to 20" pounds torque.

Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using

cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and

secure with screws.
Move the caps to the top of the Trap and mount the Trap externally

to the left side of the unit using the 2 screws provided.
Cut the 5/8" ID corrugated hose as shown above and fasten the 90 °

bend end to the Trap and fasten the straight end to the transition
drain. Secure both connections with clamps.

Reconnect the 1/2" ID drain hose from the vent drain to the Trap
and secure with a clamp.. In some cases, additional length will be

required for this hose. Use the Black plastic 1/2" OD barbed cou-
pling and a suitable section of 1/2" ID hose to make the connection.

Secure all connections with clamps
Connect the 3/16" ID relief tube from the small port on the Trap to

the top port of the transition as shown in the picture. In some

Drain Tube
Black Rubber

1/2"ID &Clamps

Dual Pressure Switch

©

piing, 1/2"OD

partsbag)

SIDE VIEW

_Rotate downward

NOTE_. Bw]t-in channel will
he angled 5° to 10° also.

Relief Tube
Black Rubber

;"ID

On Some Models
ONLY

INLET _) <_

Flexible Tubing Connector,
3/16" OD (loose parts bag)

ReliefTubeExtension

Rubber3/16" ID

Cut tofit (looseparts bag)

Trap Connection "Clamp ears"

ointed OUT

Preassemble &
insert into furnace

25-24-45

cases, additional hose length will be needed. Use the clear plastic
3/16" OD flexible tubing connector and a suitable length of extra
3/16" ID hose to make this connection.

Install the vent pipe grommet into the casing
Cut an appropriate length of 2" PVC pipe long, enough to exit the

cabinet and connect the vent drain to either:

• A standard field supplied 2" PVC tee (N9MP1 and 2 mod-
els), or

• A 2" PVC coupling fastened onto the Drain Tee (*9MPD
models)

Install Tee Trap into bottom section of Tee.
Connect the Tee trap and the main drain line exiting the casing as

shown in Figure 18.
Note: It is recommended that all PVC piping and fitting connec-

tions be fit up and inspected before final cementing. Both the ex-
ternal Trap and the external Tee Trap must be primed before

operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be

installed as shown for future servicing of the vent system.

[_1 440011020 05