ICP GNJ075N12A1 User Manual GAS FURNACE Manuals And Guides L0523223

ICP Furnace/Heater, Gas Manual L0523223 ICP Furnace/Heater, Gas Owner's Manual, ICP Furnace/Heater, Gas installation guides

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NTC5/GNJ
NTN5/GNJ(NOx Models)
Upflow/Horizontal

Series
SAFETY
Recognize safety information.

This is the safety-alert

REQUIREMENTS
/X
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 injury or 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. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) NFPA
No. 54/ANStZ223.1. 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 (NSCNGPI C). Wear safety glasses and work gloves. Have fire extinguisher available during startup 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.

Manufactured

by:

International
Comfort Products
Lewisburg, TN USA 37091

Corporation

(USA)

Design Certified
byAGA

Table of Contents
1. Installation...............................
2. Combustion& VentilationAir .................
3. GasVent Installation .......................
4. HorizontalVenting .........................
5. MasonryChimneyVenting ...................

2
4
6
8
8

9
12
13
14
16

6. Gas Supplyand Piping ...................
7. ElectricalWiring ........................
8. Ductworkand Filter ......................
9. Checksand Adjustments..................
10. FurnaceMaintenance ...................

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

LP1

2/10/98

441 01 2304 02

1. Installation
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-

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.

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 nationally recognized agency (e.g. Underwriters Laboratories or International Approval Services) installed and
maintained in the building or dwelling (see Note below).
B.

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

Failure to carefully read and follow all instructions 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.

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

Note: The manufacturer of your furnace does not test any detectors and makes no representations regarding any brand or
type of detector.
C.

To ensure safe and efficient operation
should do the the following:

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

1.

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

2.

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.
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.
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.
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.

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 LR gas with approved kit.)

3.

• Do NOT use open flame to test for gas leak.
• Ensure adequate combustion
vided to the furnace.

and ventilation

air is pro-

• Seal supply and return air ducts.

of your unit, you

Freezing Temperatures and Your Structure

• 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
tected from direct contact with water.

•

Freeze warning.
are pro-

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

Safety Rules

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.

Your unit is equipped with safety devices that may keep it from operating if sensors detect abnormal conditions such as clogged exhaust flues.

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 recommends that users of gas-burning appliances install carbon
monoxide detectors. There can be various sources of carbon monoxide in a building or dwelling. The sources could

If the structure will be unattended during cold weather you should
take these precautions.
1.
2.

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

Location and Clearances
Poison carbon monoxide gas hazard.
If furnace is a replacement, it is usually best to install the furnace
where the old one was. Choose the location or evaluate the exist-

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

Figure 1

ing location based upon the minimum clearance and furnace dimensions (Figure 1).

CAUTION
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.

or other
damage,

Dimensions and Clearances

AirBaffleDONOTREMOVE
150,000BTUONLY

L

_ _ _
MINIMUM

CLEARANCES

COMBUSTIBLE
MATERIALS
FOR ALL

TO
UNITS

REAR

0

FRONT

3" (75mm)*

For Service

30" (760mm)

ALL SIDES Of SUPPLY PLENUM

1" (25mm)

SIDES

0

VENT

30i rain.

Single Wall Vent

6" (150mm)

Type B-1 Double Wall Vent

1" (25mm)

TOP OF FURNACE

2s-2o-z_,

* 6" with accessory

DIMENSIONAL

kit installe,

INFORMATION
CABINET

MODEL

SUPPLY AIR

GAS CONNECTION

SIDE

A

B

D

E

F

G

H

K

L

M

40

151/2

281/2

181/2

14

231/8

125/8

121/4

221/2

281/4

26

237/8

075BH

40

191/8

281/2

181/2

175/8

231/8

143/4

141/2

221/2

281/4

26

237/8

100BF,100BJ

40

191/8

281/2

181/2

178/8

231/8

143/4

141/2

221/2

281/4

26

237/8

100BK

40

223/4

281/2

181/2

211/4

231/8

183/4

141/2

221/2

281/4

26

237/8

125BK / 150BK

40

223/4

281/2

181/2

211/4

231/8

183/4

141/2

221/2

281/4

26

237/8

40=10t6

C

RETURN AIR
BOTTOM

050BF / 075BF

mm Equivalents

J

151/2 = 394

191/8 = 486

228/4 = 578

281/2 = 724

181/2 = 470

14 = 356

178/8=448

211/4 = 539 231/8 = 587

128/8 = 311

143/4 = 375

183/4 = 476

121/4 = 311

141/2 = 368

t7= 432

221/2 = 572

281/4 = 717

237/8 = 606

26 = 660

ALL DIMENSIONS

IN INCHES (ram)

Installation Requirements
1.

6" (150mm)

Masonry Chimney drafthood

Install furnace

level.

Install furnace as centralized as practical with respect to the
heat distribution system
• The 150,000 Btuh furnace is manufactured with an air
baffle to equalize air flow through the heat exchanger.
(See Figure 1).
DO NOT REMOVE THIS BRACKET

3.

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

4.

De 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 clearance 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.

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 possible damage by a vehicle.

Horizontal Furnace Installation
IMPORTANT
NOTE: Inspect unit rating plate to be certain model number begins with "NTC5, NTN5 or GNJ'. This identifies unit as horizontally 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.
The following minimum clearances (Figure 2) to combustibles
MUST be maintained between the furnace and adjacent
construction. As shown in Figure 2, ONLY the corner of the cabinet is allowed to contact the rafters. All other clearances MUST
be observed as shown in Figure 1.

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.
If the furnace is to be installed in a crawl space, consult local
codes. A concrete pad 1" to 2" (25 to 50ram) thick is recommended for crawl space installation on the ground.
Thirty inches (30")(760mm) between the front ofthe 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, however 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"
(300mm) beyond the front of the furnace louver door. (This is a
recommendation only, not a requirement).
This furnace MUST NOT be installed directly on carpeting or tile
or other combustible material other than wood flooring or supports.

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

Figure 2

Typical Horizontal

Installation
Figure 3
Optionalpressure
switchlocationfor
RighttoLeft
Airflow

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

Pressure

Switch

Relocation
ShownAs

right side,relocate
switchto left side in
same orientationas
originallymounted,

2. Combustion& VentilationAir

Poison carbon monoxide gas hazard.
Use methods described here to provide combustion and ventilation air.
Failure to provide adequate combustion and
ventilation air can result in personal injury and/or
death,

•

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.

Furnaces require ventilation openings to provide sufficient 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 the absence of local codes, the applicable national codes.

Confined Space 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 this manual.

Air Openings and Connecting Ducts

NOTE: A confined space is defined as an area with less than 50
cubic feet(1.4m s) per 1,000 BTUH input rating for all gas appliances installed in the area.

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,
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, assume a 20% free area for wood and 60% for metal.

Contaminated CombustionAir
Installations in certain areas or types of structures will increase
the exposure to chemicals or halogens that may harm the furnace. These instances must use only outside air for combustion.
The following areas or types of structures may contain or have exposure 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.

the openings

Requirements
1.

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

2.

Figure 4 illustrates how to provide combustion and ventilation air. A minimum oftwo permanent openings, one inlet and
one outlet, are required.

Figure

4

Outside

Air (This is ONLY a guide.

Subject

to codes

I

I

jurisdiction.)

;

It11111
I

having

Gas Vent

This installation NOT approved in Canada
Ga_sVent _GableVent

of country

out,e,
I

_

_'ent

Air (1)

,-,

,-

,o,e,

Air (1

Air (2
/

Vent
Gas Vent

._Gnble

_"

VentilatedAttic_

J

Top Above Insulati6]'_
I

I

Minimum OneInlet andOne Outlet Air Supply is Required
May be in and CombinationShown

_1TM
Soffit Vent

InletAir Opening Mustbe Within12"(300mm)offloor
Outlet Air OpeningMust be Within12"(300ram)of ceiling
(1) 1 Square Inch (6cm2) per 4000 BTUR
Inlet
Air (1)

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

3.

One opening MUST be within 12" (300mm) of the floor and
the second opening within 12" (300mm) of the ceiling.

4.

Size openings and ducts per Table 1.

5.

Horizontal duct openings require 1 square inch(25sq, mm) of
free 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 require
1 square inch(6.5mm 3) of free area per 4,000 BTUH for combined input of all gas appliances in area (see Table 1).
Table 1

Free Area

HorizontalDuct
(2,000BTUH)

(16 cm) 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 communicate with the outdoors, and shall have a minimum free area of:
•
•

1sq. in per 3000 Btu per hr (7cm 2per kW) of the total inputrating
of all equipment located in the enclosure, and
Not less than the sum of the areas of all vent connectors in the
confined space.

Unconfined Space Installation

Most homes will require additional air.

Vertical Ductor openings
to outside
(4,000 BTUH)

Round
Duct
(4,000
BTUH)

50,000

161 cm.2(25 sq. in.)

81 cm.2 (12.5 sq. in.)

4"

75,000

242 cm2 (35.5 sq. in.)

121 cm2 (18.75sq. in.)

5"

100,000

323 cm 2 (50 sq. in.)

161 cm 2 (25 sq. in.)

6"

125,000

403 cm 2 (62.5 sq. in.)

202 cm 2 (31.25 sq. in.)

7"

150,000

484 cm 2 (71 sq. in.)

242 cm 2 (37.5 sq. in.)

7"

EXAMPLE:
Determining Free Area
Furnace Water Heater Total Input
100,000 + 30,000 = (130,000 + 4,000) = 210 cm2
(32.5 Sq. In.) Vertical
Furnace Water Heater Total Input
100,000 + 30,000 = (130,000 + 2,000) = 210 cm2
(65 Sq. In.) Horizontal
One permanent opening, commencing within 12" (30 cm) of the
top of the enclosure, shall be permitted where the equipment has
clearances of at least 1" (2.5 cm) from the sides and back and 6"

/SJ

Air (2)

Poison carbon monoxide gas hazard.

Minimum
FreeAreaRequired
for EachOpening
BTUHInput Rating

Inlet

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 personal
injury and/or death.

An unconfined space is defined as an area having a minimum volume of 50 cubic feet(1.4m 3) per 1,000 Btuh total input rating for all
gas appliances in area.
Adjoining rooms can be considered part of an unconfined area if
there are no doors between rooms.
An attic or crawl space may be considered an unconfined space
provided there are adequate ventilation openings directly to outdoors. Openings MUST remain open and NOT have any means

ofbeingclosed
off.Ventilation
openings
tooutdoors
MUST

be at
least 1 square inch (25mm 2) of free area per 4,000 BTUH of total
input rating for all gas appliances in area.

In unconfined spaces, infiltration 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 provided using the methods described in section titled Confined Space Installation:
Unusually tight construction
1

is defined as: Construction

with

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

2

Doors and openable windows are weather stripped and
Other openings
around window
floors, between
penetrations for

are caulked or sealed. These include joints
and door frames, between sole plates and
wall-ceiling joints, between wall panels, at
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 replacement air. Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60°F (15 ° c)
or flue gases will condense in the heat exchanger. This will shorten the life of the heat exchanger and possibly void your warranty.

3. Gas Vent Installation
lined in the GAMA venting tables or Masonry Chimney
section in these instructions.

Poison carbon monoxide gas, fire and explosion hazard.
Read and follow all instructions in this section.

Poison carbon monoxide gas hazard.

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

If this furnace
is replacing
a
common-vented furnace, it may be
to resize the existing chimney liner
prevent over sizing problems for
remaining appliances(s). See codes
having jurisdiction.

Install the vent in compliance with codes of the country having jurisdiction and the GAMA venting tables, local codes or ordinances and these instructions.
These fan assisted combustion furnaces have been classified as
Category ][appliances which means that they MUST operate with
a negative vent pressure.

previously
necessary
or vent to
the other
of country

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

or other
damage,

Category I SafeVenting Requirements
NOTE: The following instructions comply with the United States
National Fuel Gas Code.
If a Category ][vent passes through an attic, any concealed
space or floor, use ONLY Type B or Type L double wall vent
pipe. If vent pipe passes through interior wall, use type B vent
pipe with ventilated thimble ONLY.
2.

Venting and CombustionAir Check
NOTE: If this installation removes an existing furnace from a venting system serving one or more other appliances, and to make
sure there is adequate combustion air for all appliances, MAKE
THE FOLLOWING CHECK.
1.

Do NOT vent furnace into any chimney serving an open fireplace or solid fuel burning appliance.

3.

Use the same diameter Category ][connector or pipe as permitted by the GAMA venting tables.

4.

Keep vertical Category ][vent pipe or vent connector runs as
short and direct as possible.

5.

Vertical outdoor runs of type B or ANY single wall vent pipe
below the roof line are NOT permitted.

6.

Slope all horizontal runs up away from furnace a minimum of
!/4" (6mm) per foot.

7.

Support all horizontal vent pipe every 6' (2m) using proper
clamps and metal straps.

8.

Check existing gas vent or chimney to ensure they meet
clearances and local codes.

9.

The furnace MUST be connected to a factory built chimney or
vent complying with a recognized standard. Venting into a
masonry or concrete chimney is only permitted as out-

Seal any unused openings in the venting system.
Visually inspect the venting system for proper size and horizontal 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) remaining connected to the venting system are located and other
spaces of the building.
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.

5.

Follow the lighting instructions for each appliance being inspected. Adjust thermostat so appliance(s) will operate continuously.

6.

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).

Figure 5

Dedicated venting of one fan assisted furnace into any masonry chimney is prohibited. The chimney rnust first be lined
with either type B vent sized in accordance with tables 1 or 2 or a
listed single wall, metal lining system, sized in accordance with
the following: (Venting as outlined with use of optional masonry chimney kit as applicable.)

Vent Check

Vent Pipe "-_

I

A/

Draft Hood

Typical Gas
Match

Water Heater,
x_!

_,,p__

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
rected.

cause MUST be cor-

Listed, corrugated metallic chimney liner systems in masonry
chimneys shall be sized by using GAMA tables 1 or 2 for dedicated venting and GAMA tables 3 or 4 for common venting with
the maximum capacity reduced by 20% (0.80 X maximum capacity) and the minimum capacity as shown in the applicable table.
Corrugated metal vent systems installed with bends or offsets require additional reduction of 10% of the vent capacity for each 90 °
elbow.
NOTE: Two(2) 45 ° elbows are equivalent to one (1) 90 ° elbow.

Combined Venting into a Masonry Chimney
NOTE: If flame pulls towards draft hood, this indicates sufficient
infiltration air.

Venting to Existing Masonry Chimney

Venting into a masonry or concrete chimney is only permitted as outlined in the GAMA venting tables. Follow all safe
venting requirernents.

NOTE: The tables and notes referred to below are found in the
most recent printing of the GAMA venting tables.

NOTE: See section"Masonry

Chimney Venting"

4. HorizontalVenting
Category I Furnaces With External Power Venters
In order to maintain a Category][ classification offan assisted furnaces when vented horizontally with sidewall termination, a power venter is REQUIRED to maintain a negative pressure in the
venting system. Please consult the Fields Controls Co. or Tjernlund Products, Inc. for power venters certified for use with our furnaces.

Consult External Power Venter manufacturer

instructions.

CAUTION
It is the responsibility of the installer to properly terminate the vent and provide adequate shielding. This is
essential in order to avoid water/ice damage to building, shrubs and walk-ways.

Vent Termination
Venting Through a Non-Combustible and Combustible
Wall

5. MasonryChimneyVentingwith OptionalKit
Chimney

Inspection

All masonry chirnney construction must conform to Standard
ANSI/NFPA211 and to any state or local codes applicable. The
chimney must be in good condition and a complete investigation
must be conducted prior to installation. If the inspection reveals
damage or abnormal conditions, make necessary repairs or seek
expert help. See "The Chimney Inspection Chart". Measure area
of tile-liner and exact height of chimney.

I , llines
Camayutio
- failureproperty
to follow damage.
these guidecausen severe

Connector

1.
2.

Type

Optional Masonry Vent Kit
Draft Hood Assy. Installation

Restrictions

for Chimney

Exterior Chimney - has one or more sides exposed to the outside below the roof line. All installations must be common vented
only with another draft hood equipped Category ][appliance.

Disconnect power and gas supply to furnace.
Remove Iouvered door.
a. NTC5, NTN5 & GNJ Series furnaces - Discard Iouvered
door.

3.

NTC5, NTN5 & GNJ may be installed upflow or horizontal
position per furnace application. When installing NTC5,
NTN5 & GNJ furnaces in a horizontal left hand application
you will need to mount the pressure switch to the side of the
cabinet.

4.

NTC5, NTN5 & GNJ series furnaces - Detach pressure
switch from top panel by removing two screws. Set aside
screws.

5.

Detach field connect box from top panel by removing two
screws. Set aside screws.

Types

Interior Chimney - has no sides exposed to the outside below
the roofline. All installations can be single furnace or common
vented with another draft hood equipped Category ][appliance.

(SeeFigure8)

NOTE: These instructions apply to the NTC5, NTN5 & GNJ series
furnaces only.

To reduce flue gas heat loss and the chance of condensate problems, the vent connector must be double wall Type B vent.

Venting

I

6. Remove
fourscrews
holding
toppaneltocasing.
Remove 2.
toppanel.Discard
toppanel.Setscrews
aside.
7. Install
drafthoodassy.
tocasing
usingfourscrews
previously
setaside.

Locate furnace's main limit. Detach wire with insulated terminal from one side of main limit.
Route wire harness assy. from vent limit switch to main limit.
Attach female terminal of wire harness assy. to vacated main
limit terminal. Attach male terminal of wire harness assy. to
insulated terminal of wire previously detached from main limit.

8. Attach
fieldconnect
boxtodrafthoodassy.usingtwoscrews
previously
setaside.

9. NTC5,NTN5& GNJSeriesfurnaces
- Attachpressure Completion of Installation
switchtodrafthoodassy.usingtwoscrewspreviously
set
aside.
1. NTC5, NTN5 & GNJ Series furnaces
Vent Limit Switch Wiring

(seeFigure6)
2.

1.

Refer to installation instructions
the furnace into operation.

Locate wire harness assy. which is supplied with kit. Attach
terminals on one end of wire harness assy. to vent limit switch
located on draft hood assy.
Figure 6

Draft Hood Assembly

- Locate Iouvered door

supplied with kit. Install on furnace.
provided with furnace to put

Installation
Left hand
Horizontal
Pressure

Pressure
(old location)
on selected models
draft hood

old top panel
(discard)\

Pressure

Vent
Limit
Switch

switch

new wire
harness
wire harness
25-21-98a

Main
Limit

assembly

assy.

Masonry chimney venting shall be approached as follows: Using Tables I and 2 in the masonry chimney draft hood kit instructions, the
NFGC Z223.1-1992 or the GAMA Venting Tables.

6. Gas Supplyand Piping
• Table 2

Fire and explosion hazard.

Gas
Type

Natural Gas
Models designated for Natural Gas are to be used
with Natural Gas ONLY.

Natural
Propane

Failure to follow these instructions can result in
property damage, personal injury and/or death.

•

Gas Pressures
supply Pressure
Recommended
Max.
7 inches
(1.7 kPa)
11 inches
(2.7 kPa)

14 inches
(3.5 kPa)
14 inches
(3.5 kPa)

Min.

Manifold
Pressure

4.5 inches
(1.1 kPa)

3.5 inches
(0.9 kPa)

11 inches
(2.7 kPa)

10 inches
(2.5 kPa)

Natural Gas Input Rating Check
Gas Supply Requirements
•

Use only the Type of gas approved for this furnace. See rating plate for approved gas type.

•

Gas input must not exceed the rated input shown on the rating plate. Overfiring will result in failure of heat exchanger
and cause dangerous operation.

•

Do not allow minimum supply pressure to vary downward.
Doing so will decrease input to furnace. Refer to Table 2 for
Gas supply and manifold pressures.

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 foot.
Check with gas supplier for actual BTU content.
1.

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

2.

Time how many seconds it takes the smallest dial on the gas
meter to make one complete revolution. Refer to Example.
Note: If meter uses a 2 cubic foot dial, divide results (seconds) by two.

These units may be used at full input rating when installed at altitudes up to 2000'. When installed above 2000', the input must be
decreased 4% for each 1000' above sea level. This may be accomplished by a simple adjustment of manifold pressure or an orifice change, or a combination of a pressure adjustment and an
orifice change. The changes required depend on the installation
altitude and the heating value of the fuel. TABLE 3 & TABLE 4
show the proper furnace manifold pressure and gas orifice size to
achieve proper performance based on elevation above sea level
for both natural gas and propane.

Example
Natural Gas
BTU Content
1,000

3

Relight

No. of Seconds
Per Hour

Time Per Cubic
Foot in Seconds

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

and ensure

BTU Per
Hour
75,000

all pilots are operating.

Orifice Sizing
NOTE: Factory sized orifices for natural and LP gas are listed in
the furnace Technical Support manual.
Ensure furnace is equipped with the correct main burner orifices.
Refer to Table 3 & Table 4 for correct orifice size for a given heating value and specific gravity for natural and propane gas.

To use the natural gas table, first consult your local gas utility for
the heating value of the gas supply. Select the heating value on
the vertical border and follow across the table until the appropriate
elevation for the installation is reached. The first value in the box
at the intersection of the heating value and elevation will be the
manifold pressure required. If a gas orifice change is also required, the box is shaded. The required orifice size is shown at the
bottom of the table.

High Altitude

OperationAbove 2000' Altitude

Sea Level
Input Rate = Nameplate x (Multiplier)
Input Rate

Elevation

High Altitude
Multiplier

2000'-2999'

0.92

3000'-3999'

0.66

Fire, Explosion, Poison carbon monoxide gas
hazard.

4000'-4999'

0.84

5000'-5999'

0.80

This conversion shall be done by a qualified
service agency
in accordance
with the
Manufacturer's instructions and all applicable
codes and requirements, or in the absence of
local codes, the applicable national codes.

6000'-6999'

0.76

7000'-8000'

0.72

For installations above 4000', the inlet air restrictor of the combustion air blower MUST be changed, whether gas has been derated by the utility or orifices have been changed.

Failure to follow these instructions exactly can
result in property damage, personal injury and/
or death.

MANIFOLD

PRESSURE

AND ORIFICE

A High Altitude Kit is available which includes restrictors, orifices
and installation instructions.

SIZE FOR HIGH ALTITUDE

APPLICATIONS

NATURAL GAS
MEAN ELEVATION

FEET ABOVE SEA LEVEL

HEATING VALUE

0 to

2000 to

3000 to

4000 to

5000 to

to

7000 to

BTU/CU. FT.

1999

2999

3999

4999

5999

6999

8000

800

3.5" wc

3.5" wc

3.5" wc

3.5" wc

3.5" wc

3.2" wc

2.9" wc

850

3.5" wc

3.5" wc

3.5" wc

3.5" wc

3.2" wc

2,9" wc

2.6" wc

900

3.5" wc

3.5" wc

3.4" wc

3.1" wc

2.8" wc

2.5" wc

2.3" wc

950

3.5" wc

3.3" wc

3.1" wc

2.8" wc

2.5" wc

2.3" wc

t 000

3.5" wc

3.0" wc

2.8" wc

2.5" wc

2.3" wc

t 050

3.2" wc

2.7" wc

2.5" wc

2.3" wc

1100

2.9" wc

2.5" wc

2.3" wc

Orifice Size

#42

#42

#42

SHADED AREA REQUIRES

ORIFICE CHANGE.

6000

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¸¸¸

NO SHADING INDICATES MANIFOLD PRESSURE CHANGE ONLY.

PROPANE
HEATING VALUE
BTU/CU. FT.
2500
Orifice Size

0 to
1999
10.0" wc
#54

2000 to
2999
10.0" wc
#54

MEAN ELEVATION FEET ABOVE SEA LEVEL
3000 to
4000 to
5000 to
3999
4999
5999
9.4" wc
10.0" wc
9.8" wc
#54
#55
#55

6000 to
6999
8.8" wc
#55

7000 to
8000
7.9" wc
#55

NOTE:
NATURAL
GASDATA
BASED
ON0.60SPECIFIC
Gas Piping Requirements
GRAVITY.
PROPANE
DATA
BASED
ON1.53
SPECIFIC
GRAVITY.
FORFUELS
WITHDIFFERENT 1. Install gas piping in accordance with local codes, or in the absence of local codes, the applicable national codes.
SPECIFIC
GRAVITY
CONSULT
THELATEST
EDITION
2.
It is recommended that a manual shutoff valve be installed in
OFTHENATIONAL
FUELGASCODE
ANSIZ223.1
andCANB149.
the gas supply line outside the unit. Locate valve as close to
the furnace as possible where it is readily accessible. Refer
to Figure 9.

Changing Orifices
1.

After disconnecting
move the access
compartment.

power and gas supply to the furnace, redoor, exposing gas valve and burner

2.

Disconnect gas line and pilot tubing from gas valve so manifold can be removed.

3.

Disconnect wiring at gas valve. Be sure to note the proper
location of any and all electrical wiring disconnected.

4.

Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do not discard any screws.
See Figure 7.

Figure 7

Figure

9

I

Typical

Gas Piping

Manu=
Valve
Elbowand
short nipple

DOnotsecureor support
connectortofumane

Manifold
Drip Leg
and pipe cap
Left side entry
Gia8
Valve
25-21-43c

j

J"

25-20-95

5.

Carefully remove the manifold assembly.

6.

Remove the orifices from the manifold and replace them with
proper sized orifices. See Figure 8.

7.

Tighten orifices so there is 11/8"from the face of the orifice to
the back side of the manifold. See Figure 8.

Figure 8

Clearances

3.

Use black iron or steel pipe and fittings or other pipe approved by local code.

4.

Use pipe thread compound which is resistant to natural and
LP gases.

5.

Install a drip leg no less than 3" long to trap dirt and moisture
before it can enter gas valve.

6.

Provide a 1/8" inch plug for test gauge connection immediately up stream of gas supply connection to furnace.

7.

Use two pipe wrenches when making connections
gas valve from turning.

8.

Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace
or ductwork.

9.

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

10. Install correct pipe size for run length and furnace

to prevent

rating.

11. Measure pipe length from gas meter or LP second stage regulator.
Measure 11/8" (27mm) from face
of orifice to the back side of the
manifold.

Fire or explosion hazard.
Gas connector must be properly installed, cannot
go through the side of the furnace, and can not be
used inside the furnace.
Failure to properly install gas connector can
result in property damage, bodily injury and/or
death.
8.

Reassemble all parts in reverse order as removed. Be sure to
engage the main burner orifices in the proper opening in the
burners.

9.

After reassembling, turn gas on and check all joints for gas
leaks using a soapy solution. All leaks must be repaired immediately.

Additional LP Piping Requirements
•

Have a licensed LP gas dealer make all connections at storage tank and check all connections from tank to furnace.

•

Ifcopper
tubingisused,itMUST

comply with limitation set in
Local Codes, or in the absence of local codes, the gas codes
of the country having jurisdiction. See Appendix.

•

Two-stage

•

Do not use an open flame to test for gas leaks. Fire or explosion could occur.

•

Correct even the smallest leak at once.

regulation of LP gas is recommended.

Final Check
•

Test all pipe for leaks.

•

If orifices where changed, make sure they are checked for
leaks.

•

During pressure testing of gas piping system, observe the
following:
a. If test pressure does not exceed 1/2" PSIG, isolate the furnace by closing its individual manual shutoff valve.
b. Iftest pressure exceeds 1/2" PSIG, the furnace and its individual shutoff valve must be disconnected from the gas supply system.

•

To check for leaks apply soap suds or a liquid detergent to
each joint. Bubbles forming indicate a leak.

Fire or explosion

hazard.

Liquid petroleum (LP) gas is heavier than air and
will settle and remain in low areas and open
depressions.
Thoroughly
NOT use a
or attempt
ventilating

ventilate area and dissipate gas. Do
match or open flame to test for leaks,
to start up furnace before thoroughly
area.

An open flame or spark can result in property
damage, personal injury and/or death.

7. ElectricalWiring
Power Supply Wiring
The furnace MUST be electrically wired and grounded in accordance with local codes, or in the absence of local codes, the applicable national codes.

Figure 10

I

Electrical Connections

115V, 60Hz
I
NEUT.
Connection Box

Field wiring connections must be made inside the furnace connection box. A suitable strain relief should be used at the point the
wires exit the furnace casing.
Copper conductors shall 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.

Ground

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
board to fan control.

to furnace must be made on terminal

Set thermostat heat anticipator
Support Manual.

in accordance with the Technical

LowVokage
Terminal Board
25-2t-63

Optional Equipment
All wiring from furnace to optional equipment MUST conform to
local codes or, in the absence of local codes, the applicable national codes. Install wiring in accordance with manufacturer's
instructions.

Humidifier/Electronic Air 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 thermostat calls for air movement.
However, the electronic air cleaner is NOT energized during continuous fan operation controlled by the electronic fan control.

8. Ductworkand Filter
If separate evaporator and blower unit is used, install good
sealing dampers for air flow control. Chilled air going through
the furnace could cause condensation and shorten furnace
life. Dampers (purchased locally) 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 cool position.

Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or utility room where furnace is located, Return air duct
MUST be sealed to furnace casing,
Failure to properly seal duct can result in personal
injury and/or death,

Poison carbon monoxide gas hazard.

Duct Connections

Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger
failure,

This furnace may be installed in only a bottorn or side return application. Return air through the back of the unit is NOT allowed.

This could
death.

Side connections can be made by cutting out the embossed area
shown in Figure 11.

Figure 11

L

Cutting Side Return Air Opening

Duct Design
Design and install air distribution system to comply with Air Conditioning Contractors of America manuals or other approved methods that conform to local codes and good trade practices.
When the furnace is located in an area near or adjacent to the living area, the system should be carefully designed with returns to
minimize noise transmission through the return air grille. Any
blower moving a high volume of air will produce audible noise
which could be objectionable when the unit is located very close
to a living area. It is often advisable to route the return air ducts
under the floor or through the attic.
Refer to furnace Technical Support
for air flow information.

Manual (Blower Data)

Size ductwork to handle air flow for heating and air conditioning.

Duct Installation Requirements
•

•

When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct outside furnace space.
When a refrigeration coil is used in conjunction with this unit,
it must be installed on the discharge side of the unit to avoid
condensation on the heat exchanger.

injury

and/or

•

Installation of locking-type dampers are recommended in all
branches, or in individual ducts to balance system's air flow.

•

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

•

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

•

Ductwork installed in attic, or exposed to outside temperatures require 2" of insulation with outdoor type vapor barrier.

•

Ductwork installed in an indoor unconditioned space requires a minimum of 1" of insulation with indoor type vapor
barrier.

Starting

Bottom returns can be made by removing the knockout panel in
the furnace base. Do NOT remove knock-out except for a bottom
return.

result in personal

Inspection Panel
A removable access panel should be provided in the outlet duct
when the furnace is installed without a cooling coil. This will allow
smoke or reflected light to be observable inside the casing to indicate the presence of leaks in the heat exchanger. This access
cover shall be attached in such a manner as to prevent air leaks.

Filters
The furnaces, with 1600 or less CFM rating, are supplied with a
16" x 25" high velocity filter and rack. On these models, the supplied filter rack may be mounted internally for bottom return or externally for side return.
The furnaces with greater than 1600 CFM requires that both left
and right side returns are used in side return applications. Two 16"
x 25" high velocity filters and racks are provided with furnace. Filter racks must be mounted externally. If return air must be on one
side only, an optional 20" x 25" filter standoff rack kits can be
used. For bottom return, an optional 20" x 25" filter rack kit can
be mounted internally.
NOTE: All California (NOx) 5 ton models come with a 20" x 25"
bottom return filter.

Filters Rack Installation
Side Return
Center the filter rack
of the furnace. Mark
in the side panel and
screws. See Figure

on the side panel, flush with the bottom edge
the fastening holes. Drill the fastening holes
fasten the filter rack in place with sheet metal
12.

CAUTION
Figure 14

If filters are only suitable for heating application,
advise homeowner
that filter size may need to be increased if air conditioning
is added.

Figure 12 [

Filters Installed on Two Sides

Side Return Filter Rack

Filter

Filler

Bottom Return
When installing a bottom mounted filter rack, slide the two side
filter clips to the back of the furnace BEFORE installing. This will
allow the rack to clear the front raised edge of the furnace. Insert
rack into side clips first and push rack back until it is fully engaged
into back clip. When rack is in place, slide clips back into place
midway on rack as shown in Figure 13.

Figure 13

Figure 15

1

Optional Duct Standoff

20 x 25 Optional
Filter Rack

Bottom Mounted Filter Rack

AW3192

Slide filter clips towards back before removing

9. Checks and Adjustments
Startup
Fire or explosion hazard.
NOTE: Refer to startup procedures
Manual.

in the Users Information

Turn OFF gas at shut off before connecting Utube manometer.
Failure to turn OFF gas at shut off before connecting U-tube manometer can result in personal injury and/or death.

CAUTION
If any sparks, odors or unusual noises occur, immediately shut OFF power to furnace. Check for wiring errors or obstruction to blower.
1.

With gas OFF, Connect U-Tube manometer to tapped opening on gas valve. Use manometer with a 0 to min. 12" water
column range.

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

2.

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

Manifold Gas Pressure Adjustment

NOTE: Adjustment screw cover MUST be placed on gas valve
before reading manifold pressure and operating furnace.

Gas Supply Pressure

3.
NOTE: Make adjustment to manifold pressure with burners operating.

For altitudes up to 2000', set pressure to value shown in
Table 2, _+0.3" (8mm) water column. For altitudes up to 2000'
to 8000', see Section 6 for correct pressure valve.

Adjust Pilot Burner
The furnace has a pilot flame to light the main burner. The flarne
should surround 3/8" to 1/2" of the thermocouple. See Figure 16.
To adjust, remove cap from pilot adjusting screw on gas valve.
Turn screw counterclockwise
to increase or clockwise to decrease flame as required. Replace cap for adjusting screw.

Figure 16

2.

Operate furnace continuously
ters and duct dampers open.

for 15 minutes with all regis-

3.

Take reading and compare with range specified
plate.

on rating

If the correct amount of temperature rise is NOT obtained, it
may be necessary to change blower speed. A higher blower
speed will lower the temperature rise. A lower blower speed
will increase the temperature rise.

Pilot Burner

Changing Blower Speed

Electrical shock hazard.
Turn OFF power to furnace before changing speed
taps.
Failure to do so can result in personal injury and/or
death.
10-11-65

Main Burner Flame Check
Allow the furnace to run approximately 10 minutes then inspect
the main burner and pilot flames. See Figure 17.
Check for the following (Figure 17):
•

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

•

Flames extending
changer.

directly from burner into heat ex-

•

Flames do NOT touch sides of heat exchanger

If any problems with main burner flames are noted, it may be necessary to adjust gas pressures, or check for drafts.

NOTE: The speed taps that the manufacture sets from the factory
for this product are based on a nominal 400 CFM per ton cooling
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 application 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 control
as well as location of unused blower motor speed leads. Use
the chart (Table 5 ) to determine the blower motor speed settings.

Table

5

Blower

Wire Color

Figure 17

Main Burner

Temperature Rise Check
The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate. Temperature rise is the difference between supply and return air temperatures.
To check temperature
1.

rise,use the following procedure:

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

Chart
Motor Speed

Black

High

Orange*
Blue

Med-High
Medium

Red

Low

* Med-High

10-10-78

Speed

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 replace it
with the desired motor speed lead from the "Unused 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 cooling,
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: When using the same speed on motors with (4) speed
leads, it will be necessary to tape off the terminal of the motor
speed lead removed from the "Heat" or "Cool" terminal with
electrical tape since an open terminal will not be available at
the "Unused Motor Lead" location.

Continuous Fan Operation

Separate speed selections for Heat, Cool, and Continuous
Fan

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.

Connect low speed lead from circulating motor to the "Cont." terminal at the electronic fan control. The appropriate motor leads
should already be connected to the "Heat" and "Cool" terminals.

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

Heating and Continuous Blower Speed the Same
If it is necessary to operate the heating speed and continuous
blower speed using the same blower speed, connect a jumper between the "Heat" and "Cont." terminals on the electronic fan control.
Note: There should be only ONE motor lead going to the "Heat"
and "Cont." terminals.

10. FurnaceMaintenance
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".

Pressure Switch
During regular yearly maintenance
on the pressure switch.

check for cracks in any tubes



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