ICP FBF050B12A1, FBF050B12A2, FBF050B12A3, FBF075B12A1, FBF075B12A3 Installation Guide

NTG3/FBF

NTN3/NBF(NOxModels)

Upflow/Horizontal

Series

SAFETY REQUIREMENTS

Recognize safety information. This is the safety-alert symbol _. When you see this symbol on the furnace and in instructions
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 in minor personal injuryor prod uct 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. Inthe United States, follow all safety codes includingthe current edition National Fuel Gas Code (NFGC) NFPA
No. 54/ANStZ223.1. In Canada, refer to the current edition ofthe National Standard Canada CAN/CGA-B149.1 - and .2-M91 Natural

Gas and Propane Installation Codes (NSCNGPI C). 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 require these instructions as a minimum for a safe installation.

Design Certified

byAGA

/X

Manufactured by:

International Comfort Products Corporation (USA)

Lewisburg, TN USA 37091

Table of Contents

1.Installation............................... 2

2.Combustion&VentilationAir ................. 4

3.GasVent Installation ....................... 6

4.HorizontalVenting ......................... 7

5.GasSupplyandPiping ...................... 8

6.MasonryChimneyVenting ................... 8

7.GasSupplyand Piping ...................

8.ElectricalWiring ........................

9.DuctworkandFilter ......................

10.ChecksandAdjustments.................

11.FurnaceMaintenance ...................

This furnace is not designed for use in mobile
homes, trailers or recreational vehicles. Such
use could result in property damage, bodily in-
jury and/or death.

LP1 7/29/98 441 01 2601 04
Replaces 441 01 2601 03 (6/98)

9

12
13

14
16

1. Installation

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, property damage, personal injury
and/or death.

NOTE: This furnace is design certified by the American Gas

Association and the Canadian Gas Association for installation in
the United States and Canada. Refer to the appropriate codes,

along with 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. (Furnace can
be converted to L.R gas with approved kit.)

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

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

• Seal 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.

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

• It is the suggestion of this manufacturer to install fire and
carbon monoxide detectors.

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

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).

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 extinguisher and smoke detectors listed

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

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

tors 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 systern 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.
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.

FreezingTemperatures andYour Structure

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.

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.

/SJ

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

haust flues.

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.

Havesomeonecheckthestructurefrequentlyduringcold

weathertomakesureitiswarmenoughtopreventpipes
fromfreezing.Suggesttheycallqualifiedserviceagency,if

required.

Poison carbon monoxide gas hazard.
If this furnace is replacing a previously

common-vented furnace, it may be necessary to
resize the existing vent line and chimney to
prevent oversizing problems for the other
remaining appliances(s). See applicable codes
and Venting and Combustion Air Check in Gas

Vent Installation section.
Failure to properly vent this furnace or other

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

iiiiiiiiiiiiiiiiiiiiiiii!:i¸iiii i !;;;iiiii;;;;;iii !i! i!!!iiiii

Dimensions and Clearances

Locationand Clearances

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

where the old one was. Choose the location or evaluate the exist-
ing location based upon the minimum clearance and furnace di-

mensions (Figure 1).

CAUTION

Do NOT operate furnace in a corrosive atmosphere

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

tion, Contaminated Combustion Air.

MINIMUM CLEARANCES TO

COMBUSTIBLE

MATERIALS FOR ALL UNITS

!_ ._l _./ 4"/K Tr _ \ _ 1 _. _ A

_ /_HHH_,HMHMHHHHHHMH _HHH,_ _ _ _

REAR 0
FRONT 3" (75mm)*

For Service 30" (760mm)

ALL SIDES Of SUPPLY PLENUM 1" (25mm)
SIDES 0

VENT

Single Wall Vent 6" (150mm)
Type B-1 Double Wall Vent 1" (25mm)

TOP OF FURNACE 6" (150mm)

6 with accessory Masonry Chimney drafthood kit installed

o

DIMENSIONAL_ "_e / 25-22-28

Unit

Capacity

50FB/050B12 40

75FB/075B12

75HFt075F16 40 11/2 11/2 t5/8 21/2 41/2 175/16 237/8 281/4

IOOKF/ 100F20

IOOKJ/IOOJ20 40 11/2 1112 t5/8 21/2 41/2 175/16 23718 28114
125KJI125J20

mm Equivalents 40=1016 151/2 = 394 191/8 = 486 223/4 = 578 281/2 = 724 181/2 = 470 14 = 356
211/4 = 539 231/8 = 587 125/8 = 311 143/4 = 375 183/4 = 476 121/4 = 311 141/2 = 368 17= 432

281/4 = 717 26 = 660 237/8 = 606

Cabinet

A

151/2 281/2

191/8 281/2

223/4 281/2

B C

11/2 11/2 t5/8 21/2 41/2 175/16

ElectricalConnections

Top Left/RightSide LowVolt

D E D E R P

SupplyAir

0 X

181_ 14

181_ 17%

181_ 211_

ReturnAir

Bottom Side

F G J H

231t8 125/8 221/2 t21/4

231t8 143/4 221/2 t41/2

231/8 183/4 221/2 t41/2

GasConnections

RightSide Le_ Side

M K L K

237/8 281_ 26 281_

26 281_

26 281_

175/8=448

221/2 = 572

Installation Requirements

I. I,_L,_ll ru,,_,_._ I,_v,_l.

ALL DIMENSIONSININCHES(millimeters)

2. Install furnace as centralized as practical with respect to the

he,at distrih_tinn syste,m

E21

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
combustible material other than wood flooring.

5. Maintain clearance for fire safety and servicing. A front clear-
ance of 30" (760mm) is minimum for access to the burner,

controls and filter.

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

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.

Ifthe furnace is to be installed ground level in a crawl space, con-

sult local codes. A concrete pad 1" to 2" (25 to 50ram) thick is
recommended.

Thirty inches (30")(760mm) between the front ofthe furnace and
adjacent construction or other appliances MUST be maintained

for service clearance.

7. Residential garage installations require:

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

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

Horizontal Furnace Installation

IMPORTANT

NOTE: Inspect unit rating plate to be certain model number be-

gins with "NTN3/NTG3 or NBF/FBF'. This identifies unit as hori-
zontally mountable. If unit does NOT bear this designation, you

may NOT mount this unit horizontally. Horizontal furnace may
not be mounted on its back.

If you purchased a horizontally mountable furnace, it can be

installed horizontally in an attic, basement, crawl space, alcove,
or suspended from a ceiling in a basement or utility room in either
a right or left airflow position. See Figure 2.

Typical Horizontal Installation

Keep all insulating materials clear from Iouvered door. Insulating

materials may be combustible.

It is recommended for further fire protection that cement board or
sheet metal is placed between the furnace and the combustible
wood floor and extend 12" (300ram) beyond the front of the fur-
nace louver door. (This is a recommendation only, not a require-
ment).

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

Pressure Switch Relocation

Ifthe furnace is installed in a right to left airflow position (left side of
furnace facing down), the pressure switch will remain in the same

position as installed by the factory (see Figure 3). Ifthe furnace is
installed in a left to right airflow position (right side of furnace fac-

ing down), the pressure switch MUST be relocated to the left side
of the furnace using the holes provided inthe top panel. Position
the pressure switch in the same orientation as the original loca-

tion. To prevent possible kinking ofthe pressure switch hose, trim
the hose to remove excess.

Note: Care MUST be taken not to cut the tube too short.

The following minimum clearances to combustibles MUST be

maintained between the furnace and adjacent construction. As
shown in Figure 1, ONLYthe corner of the cabinet is allowed to
contact the rafters Figure 2. All other clearances MUST be ob-
served as shown in Figure 1.

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 attach the furnace. These straps

D

Pressure Switch Relocation

rightside,relocate

switchto left side in
sameorientationas

originallymounted.

ShownAs

2. Combustion&VentilationAir

Confined Space Installation

Poison carbon monoxide gas hazard.
Use methods described here to provide combus-

tion and ventilation air.

Failure to provide adequate combustion and
ventilation air can result in personal injury and/or

death,

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 applica-

ble national codes.
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.

ContaminatedCombustionAir

Installations in certain areas or types of structures will increase

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

nace. These instances must use only outside 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 outside 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.

NOTE: A confined space is defined as an area with less than 50
cubic feet(1.4m 3) per 1,000 BTUH input rating for all gas ap-

pliances installed in the area.

Air Openings and Connecting Ducts

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

2. Connect ducts or openings directly to outside.

3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4" (6mm) mesh.

4. The minimum dimension of rectangular air ducts MUST NOT
be less than 3" (75mm).

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.

Requirements

1. Provide confined space with sufficient air for proper combus-
tion and ventilation of flue gases using horizontal or vertical

ducts or openings.