ICP C8MPT050B12B1 User Manual 90+ 2 STAGE & MULTI SPEED BLOWER GAS FURNACE Manuals And Guides L0909253

ICP Furnace/Heater, Gas Manual L0909253 ICP Furnace/Heater, Gas Owner's Manual, ICP Furnace/Heater, Gas installation guides

User Manual: ICP C8MPT050B12B1 C8MPT050B12B1 ICP 90+ 2-STAGE & MULTI-SPEED BLOWER GAS FURNACE - Manuals and Guides View the owners manual for your ICP 90+ 2-STAGE & MULTI-SPEED BLOWER GAS FURNACE #C8MPT050B12B1. Home:Heating & Cooling Parts:Icp Parts:Icp 90+ 2-STAGE & MULTI-SPEED BLOWER GAS FURNACE Manual

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80+ GAS FURNACE

*8MPT
*8MPV

Category I Furnace
Two-Stage Heating
Variable Speed, Two-Stage
Two- Stage Cooling Units

Heating & Supports
* Denotes

Brands (C, R, T)

See Section 5 for Category ! definition.

SAFETY

CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized
kits
or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when
installing.
Follow att safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas
Code (NFCG) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the National standards of Canada CAN/CSA-B149.1
and .2 Natural Gas and
Propane Installation Codes, and Canadian Electrical Code CSA C22.1.
Recognize safety information. This is the safety-alert symbol z_. When you see this symbol on the unit and in instructions
or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

INSTALLER:
adjacent

International Comfort Products, LLC
Lewisburg, TN.37091

Affix these instructions

on or

to the furnace.

CONSUMER:
Retain these instructions
future reference.

for

Table of Contents

1. Safe InstallationRequirements..................
2. Installation.................................
3. SideVenting................................
4. Combustion& VentilationAir ...................
5. GasVentInstallation .........................
6. HorizontalVenting ...........................
7. ChimneyAdapterVenting ......................
8. Gas Supplyand Piping ........................
9. ElectricalWiring .............................

4
5
8
9
12
13
15
18
22

10. Ductwork and Filter (Upflow/Horizontal)

.........

11. Ductworkand Filter(Downflow) ...............
12. Checksand Adjustments ....................
13. FurnaceMaintenance .......................
14. Sequenceof Operation& Diagnostic(*8MPT) .....
15. WiringDiagram(*8MPT) .....................
16. Sequenceof Operation& Diagnostic(*8MPV) .....
17. WiringDiagram(*8MPV) .....................
18. ThermostatWiringGuide ....................

27
30
33
34
36
37
39
40

ELECTRIC SHOCK HAZARD

CARBON MONOXIDE POISONING AND FIRE
HAZARD.

Failure to follow this warning
could result in personal injury
and/or death.

Failure to follow this warning could result in
personal injury, death and/or property damage.

Turn Off All Power Before
Servicing.

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

Portions of the text and tables are reprinted from NFPA 54 / ANSi Z223.1-2006@,
with permission of National
Washington
DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSi
entirety.

Fire Protection Association,
Quincy, MA 02269
on the referenced subject which is represented

Specificationsare subject to changewithout notice

and American Gas Association
only by the standard in its

441 01 202301

March2009

START-UP CHECK SHEET
For PSC Models *8MPT
(This sheet is optional.
Date of Start-Up:.

Keep for future reference.)
Calculated Input (BTU) Rate: (See Checks and Adjustments Section).

Dealer Name:

Heating Check
Measured Line Pressure During High Heat:

Address:

Measured Manifold Pressure:
City, State(Province),

Zip or Postal Code:

High Heat
Low Heat

Temperature of Supply Air:
Phone:

High Heat
Low Heat

Temperature of Return Air:

Owner Name:

Temperature Rise (Supply - Return): High Heat __
Address:

Low Heat

City, State(Province),

In Rise Range (see furnace rating plate)?

Zip or Postal Code:

Static Pressure (Ducts) High Heat:

Supply
Return

The Blower Speed Tap used for:
Model Number:

High Heat
Low Heat

Optional Check:

Serial Number:

CO?
CO2?

Setup Checks

Cooling Check

Check the box when task is complete.

Temperature of Supply Air:

All Electrical Connections Tight?

Temperature of Return Air:
Temperature Difference:

Manual Gas Shut-off Upstream of Furnace/Drip LegLU
Gas Valve turned ON?

Static Pressure (Ducts) Cooling:

Return

Lj
The Blower Speed Tap used for:

Type of Gas:

Natural: Lj

LP: Lj

Supply

Cooling

Dealer Comments:

Filter Type and Size:
Shade in Heating Fan "Time OFF" Setting and Thermostat Type setting:

SWl

44101 202301

Specifications are subject to change without notice

START-UP CHECK SHEET
For Variable Speed Models *8MPV
(This sheet is optional.
Date of Start-Up:.

Keep for future reference.)
Calculated Input (BTU) Rate: (See Checks and Adjustments Section).

Dealer Name:
Heating Check
Address:

Measured Line Pressure During High Heat:

City, State(Province),

Measured Manifold Pressure:

Zip or Postal Code:

High Heat
Low Heat

Temperature of Supply Air:

Phone:

High Heat
Low Heat

Owner Name:

Temperature of Return Air:

Address:

Temperature Rise (Supply - Return): High Heat __

City, State(Province),

Low Heat

Zip or Postal Code:

In Rise Range (see furnace rating plate)?
Static Pressure (Ducts) High Heat:

Model Number:

Supply
Return

Serial Number:
Optional Check:
Setup Checks

CO?
CO2?

Check the box when task is complete.

Cooling Check

All Electrical Connections Tight?

Temperature of Supply Air:
Temperature of Return Air:

Manual Gas Shut-off Upstream of Furnace/Drip Leg[--]
Temperature Difference:
Gas Valve turned ON?

Type of Gas:

Natural: Lj

Static Pressure (Ducts) Cooling:

Supply
Return

LP: Lj

Filter Type and Size:

Dealer Comments:

Shade in Final Furnace Settings Below:

w2looooooDo
1

SW1 [_
123

1 234

5 678

BLOWER
I=a D ADJUST
D el J;

_-_

AC/HPEfficiency
HP
Comfort

liP mode
select

Specificationsare subject to changewithout notice

441 01 202301

1. Safe Installation Requirements
Seal around supply and return air ducts.

FIRE, EXPLOSION,
AND
POISONING HAZARD

CARBON

Install correct filter type and size.

MONOXIDE

Improper
adjustment,
alteration,
service,
maintenance or installation could result in personal
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.

Unit MUST be installed so electrical components
tected from direct contact with water.

SafetyRules
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,

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 wilt result in failure of heat
exchanger and cause dangerous operation. (Furnaces
can be converted to Propane gas with approved kit.)

•

Install this furnace only in a location and position as specified in "Installation" of these instructions.

•

Provide adequate combustion and ventilation air to the
furnace as specified in "Combustion and Ventilation Air" of
these instructions.
Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in "Combustion and Ventilation Air, Horizontal
Venting and Chimney Adapter Venting" of these instructions.
Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
"Gas Supply and Piping, Final Gas Piping Check" of these
instructions.

•

Always install furnace to operate within the furnace's intended 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 instructions. See furnace rating plate.
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by
a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

•

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

•

This furnace is not to be used for temporary heating of
buildings or structures under construction. See "Installation", item 10.

•

This furnace is NOT approved for installation
bile homes, trailers or recreation vehicles.

44101 202301

in mo-

are pro-

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.
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 carbon monoxide levels, you should have a commercially available carbon monoxide alarm that is listed by a nationally
recognized testing agency in accordance with Underwriters
Laboratories Inc. Standard for Single and Multiple Station
Carbon Monoxide Alarms, ANSl/UL 2034 or the CSA 6.19-01
Residential Carbon Alarming Devices installed and maintained in the building or dwelling concurrently with the gasfired furnace installation (see Note below). The alarm should
be installed as recommended by the alarm manufacturer's
installation instructions.

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 Laboratories 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.

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

Thoroughly read this manual and labels on the unit. This
wilt 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.

Specifications are subject to change without notice

FrozenWater Pipe Hazard

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 wilt be unattended during cold weather you should
take these precautions.

WATER DAMAGE TO PROPERTY HAZARD

Failure to protect against the risk of freezing could
result in property damage.
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.

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-

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 devices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.

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-

Install a reliable remote sensing device that wilt notify
somebody of freezing conditions within the home.

2. Installation
CARBON MONOXIDE POISONING HAZARD

Do NOT install furnace directly on carpeting, tile or other combustible material other than wood flooring.

Maintain clearance for fire safety and servicing. A front clearance of 24" (610 mm) is minimum for access to the burner,
controls and filter. See clearance requirements in Figure 1.

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

Residential garage installations require:

Failure to properly vent this furnace or other
appliances could result in personal injury or death.
If this furnace is replacing a previously commonvented furnace, it may be necessary to resize the
existing vent system to prevent oversizing
problems for the other remaining appliances(s).
See Venting and Combustion Air Check in the Gas
Vent Installation section of this instruction.

Burners and ignition sources installed at least 18" (457 mm)
above the floor.
Furnace must be located or physically protected from possible damage by a vehicle.
9,

Locationand Clearances
If furnace is a replacement, it is usually best to install the furnace
where the old one was. Choose the location or evaluate the existing location based upon the minimum clearance and furnace dimensions (Figure 1).

If the furnace is to be suspended from the floor joists in a
basement or 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 preferred method is
to use an angle iron frame bolted to the rafters or joists.

10. This furnace may be used for construction heat provided that:

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Do NOT operate furnace in a corrosive atmosphere
containing
chlorine, fluorine
or any other
damaging chemicals, which could shorten furnace
life.
Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air for combustion air
evaluation and remedy.

InstallationRequirements
1. Install furnace level.
2,

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

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

Install the vent pipes as short as practical. (See Gas Vent
Installation section).
5

The furnace is permanently installed with all electrical
wiring, 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
minimize 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.
The temperature of the return air to the furnace is maintained between 55 ° F (13 ° C) and 80 ° F (27 ° C), with no
evening setback or shutdown. The use of the furnace
while the structure 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.

Specifications are subject to change without notice

441 01 202301

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 com)leted.
Dimensions

and Clearances

(*8MPT/*8MPV)

TOP

REAR

eate *

;iiii!!,i
i

.... /

5 (127)

FRONT (combustion air openings in
furnace and in structure)

3" (76 mm)

Required For Service

......

*24" (610 ram)

ALL SIDES Of SUPPLY PLENUM

24"(610)min,

(25)

in(mm)
MINIMUM CLEARANCES TO
COMBUSTIBLE MATERIALS FOR ALL UNITS

_te,_

After construction is complete,verify proper furnace operating conditions including ignition, gas input rate, air
temperature rise, and venting according to these installation instructions.

1" (25 mm)

SIDES

.......................................................
i

VENT

LEFT SIDE

Single Wall Vent

........................
A ...............
_

6" (152 mm)

Type B-1 Double Wall Vent

"ii

1" (25 mm)

TOP OF FURNACE

1" (25 mm)

*30" (762ram)clearancerecommendedfor furnaceremoval,

:t /

Horizontal)osition:Linecontactis permissibleonly betweenlines
formedby intersectionsof top and two sidesof furnacejacket, and
buildingjoists,studs or framing,
i .......................................................
_

_o,

(48)

_-_

265/8 (676) --_

281/2

133/4 (95)

(124) i
r_

_-_

181/_

470 _
_

3/4

(19)

i
,

(724)

............................................

BOTTOM

(9!o)_
i

37i

(851)

'_-

231/8

(587)

,_,

41/16

(103)

33 ]i

ALL DIMENSIONS- IN(MM)
1 in = 25.4 mm

1) i
14

_ I?
.......................
1/4-(57!

(749)

1
Plugged starting hole
to cut side duct opening.

(440)

Furnace

i 1'75/16

INFORMATION
I

Cabinet

Top

Bottom

*8MPTN050B
*8MPTN075F14

*8MPT100F14

15A/2

1B4

(152)

13/4

cOpening3/8
I 126/8
o I

(45)

(76)

(356)

191!8

171/2

(486)

(445)

73/4
(197)

(1.4) 1(321) 1

223/4

211/4

91/2

115/16

183/4

(540)

(241)

(49)

(476)

21/8

131/4
(337)

.......

i i

;

I ReturnAir

Capacity

0o16)

291/_

DIMENSIONAL

(!7a)_
...................

= 47/a

_ (124)

215/8 (542)
261/2

i "

_
17/8 (48)

(673)

143/4 [

(54) 1(15)

....

NOTE: Evaporator "A" coil
drain pan dimensions may vary from furnace duct opening size. Always
consultevaporator specificationsfor duct size requirements.
Furnace is designedfor bottom return or side return,

*8MPTN100J20

*8MPTN125J20 (578)
* Denotes Brand

Return airthrough back of furnace is NOT allowed.

Drawingis representative,but some modelsmayvary

InstallationPositions

Furnace Installation

This furnace can be installed in an upflow, horizontal (either teft or
right) or downflow airflow position. DO NOT install this furnace on
its back. For the upflow position, the return air ductwork can be attached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must be
attached to the bottom. The return air ductwork must never be attached to the back of the furnace.

Inspect the rating plate to be certain the model number begins with
"*8MPV" or "*8MPT'. This identifies the unit as a multi-position
furnace and can be installed in a Upflow, Horizontal Right, Horizontal Left or Downflow position.

44101 202301

Upflow
No modifications
Figure 2)

Specifications are subject to change without notice

are required

for upflow

installation.

(See

iiiiiiiiii!i!i T p,ca,
up,,ow,nsta,,a,,on

The horizontal furnaces may be installed directly on combustible
wood flooring or supports, however, it is recommended for further
fire protection cement board or sheet metal is placed between the
furnace and the combustible wood floor and extend 12" (305 mm)
beyond the front of the furnace louver door. (This is a recommendation only, not a requirement).

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

This furnace MUST NOT be installed directly on carpeting, tile or
other combustible material other than wood flooring or supports.

Downflow

FIRE HAZARD

Horizontal
If you purchased a multi-position 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 3)
Horizontally installed furnaces may be vented out the top of the
unit or out the side facing up. See "Side Venting" for instructions
to rotate the vent to the side.
The minimum clearances to combustibles MUST be maintained
between the furnace and adjacent construction, as shown in
Figure 1. ONLY the corner of the cabinet is allowed to contact the
rafters Figure 3. All other clearances MUST be observed as
shown in Figure 1.
i:i

_iii_

Failure to install furnace
on noncombustible
subbase could result in personal injury, death
and/or property damage.
Place furnace on noncombustible subbase on
downflow
applications,
unless installing
on
noncombustible flooring.
The Multi-position furnace (*8MPT or*8MPV) may be installed in
a downflow configuration, (see Figure 4). The minimum clearances to combustion MUST be maintained between the furnace
and adjacent constructions, as shown in Figure 1.
In addition to clearances in Figure 1, clearance for the vent pipe
must be considered.
A subbase for combustible floors MUST be used when the furnace
is installed as a downflow on combustible material. See "Ductwork and Filter" (Downflow Section). The outlet flange must be
bent flat for downflow installation.

iii

i_i

Typical

Horizontal

Installation

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

When installing a four-position furnace in the downflow position,
the logo is to be repositioned so that it is right side-up as follows:
T8MPT and T8MPV Model Numbers

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
should be attached to the furnace bottom side 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 ground level in a crawl space, consult local codes. A concrete pad 1"to 2" (25.4 to 50.8mm) thick is
recommended.
24" (610 mm) is recommended between the front of the furnace
and adjacent construction or other appliances. This should be
maintained for service clearance. 30" (762mm) is required to remove furnace.
Keep all insulating materials clear from Iouvered door. Insulating
materials may be combustible.

Find the door hardware kit that is stored in the furnace and
save it.

Carefully remove logo from the outside of burner compartment door and save it.

Carefully remove two small plug buttons from outside of
blower compartment door and save them.

Remove two thumbscrews from blower compartment door.
Save the two thumbscrews.

Install two thumbscrews in holes at other end of blower
compartment door from where thumbscrews were removed.

Install new strip of rubber gasket on inside of blower
compartment door on edge that does not already have a
gasket.

Install logo retainer pins into holes in blower compartment
door from which plug buttons were removed.

Install plug buttons into holes in burner compartment
from which logo was removed.

Install blower compartment
edge and logo at top.

10. Install burner compartment
edge at bottom.

door

door on furnace with bevel
door on furnace

with bevel

C8MPT, C8MPV, H8MPT, and H8MPV Model Numbers
1.

Carefully remove logo from burner compartment
save it.

Turn the logo rightside-up, and install the logo retainer pins
into holes in burner compartment door

Specifications are subject to change without notice

door and

441 01 202301

New labels for rightside-up application on outside of blower
compartment door may be purchased in a kit from your distributor to cover upside-down labels.

PressureSwitch Relocation
If the furnace is installed in the upflow position, the pressure
switch will remain in the same position as installed by the factory
unless the inducer is rotated. If the furnace is installed in an orien-

T ,ca,
oown.ow.nsta.a.,on
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

tation that places the pressure switch below the pressure tap on
the inducer housing, then the switch MUST be relocated. In order
to relocate the switch, locate 2 mounting holes or drill above the
inducer pressure tap. When drilling the 2 holes make sure to keep
the switch and tubing far enough away from the burners or hot surfaces as to not melt the hose, switch, or wires. To prevent possible
kinking of the pressure switch hose, trim the hose to remove excess length (see Figure 5). If additional wire length is needed, cut
the wire tie.

Pressure

Switch

Tube Routing

PRESS SW ASSY (DUAL)
SCREW HEX HD

(2)

Downflow Venting: The combustion venter MUST be rotated to
vent out the side for all downflow installations, (see Figure 4). Bottom venting is not permitted. See "Side venting" for instructions
to rotate the vent to the side. In addition to rotating the vent to the
side, a Vent Pipe Shield (NAHA002VC) is required to shield the
hot vent pipe.

BURN HAZARD
Vent pipe is HOT and could result in personal
injury.
Hot vent pipe is in reach of small children when
installed in downflow position.
Install vent pipe shield NAHAOO2VC.

TUBTNG

2 STAGE/VARIABLE
SPEED

Note: When drilling new holes make sure metal shavings do not
fall on or in components, as this can shorten the life of the furnace.

3. Side Venting
This furnace is shipped from the factory with the venter assembly
in an upflow configuration (top vent). The venter assembly can
easily be rotated to a side vent configuration for use in upflow, horizontal-flow, or downflow application.
When using a side vent configuration (side outlet instead of top
outlet), it may be necessary to relocate the pressure switch to the
alternate position on the opposite side of the top panel. Two screw
holes are provided at the alternate position. Route the pressure
switch tubing so the tubing is not kinked and not touching the hot
collector box, venter housing, or motor. It may be necessary to
shorten the length of the tubing to properly route the tubing and
eliminate kinks.

44101 202301

Rotatingthe Venter Assembly
1.

If gas and electrical power has already been connected to
unit, shut off gas and remove power from unit. Unscrew
screws on burner compartment door and remove burner
compartment door. (See Figure 6.)

Disconnect power leads to the venter motor and hose to pressure switch. Remove four(4) screws which secure the venter
to the collector box. (See Figure 7.)

Cut webbing with a pair of snips holding the vent plate to the
cabinet on either the left or right side of unit depending on
right or left venting as desired. Discard vent plate, (see
Figure 6).

Specifications are subject to change without notice

Venter as et

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li/ l urnacew,t Screws

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....

Vent Plate

Replace venter gasket (part # 1013540, if needed) to venter
assembly with adhesive in the same location as the old one.
5.
Rotate venter assembly 90 ° right or left from original location
depending on venting configurations.
6. Tighten the four(4) screws that secure the venter assembly to
the collector box. Do not overtighten. Do tighten screws
enough to compress venter gasket.
7.
Replace power leads to venter motor and reconnect hose to
pressure switch.
NOTE: Unused open vent hole must be covered. A Vent Cover is
supplied with Vent Pipe Shield Kit NAHA002VC. A 55/16"
(135mm) diameter Vent Cover can be fabricated with sheet metal
for all side vent installations.

4. Combustion

& Ventilation Air

CARBON MONOXIDE POISONING HAZARD
Failure to provide adequate combustion
and
ventilation air could result in personal injury or
death.
Use methods
described
here
combustion and ventilation air.

provide

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.
Combustion and ventilation air must be supplied in accordance
with one of the following:
1.

Section 9.3, Air for Combustion and Ventilation, of the National Fuel Gas Code, National Fuel Gas Code (NFGC), NFPA
54/ANSI Z223.1-2006 in the U.S.,

Sections 8.2, 8.3, 8.5, 8.6, 8.7, and 8.8 of National Standard
of Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1-05 in Canada,

Applicable

provisions of the local building code.

When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting
And Combustion Air Check in "Gas Vent Installation" Section in
this manual.

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

Outdoor CombustionAir Method

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

A space having less than 50 cubic feet per 1,000 BTUH (4.8 cubic
meters per kW) input rating for all gas appliances installed in the
space requires outdoor air for combustion and ventilation.

Specifications are subject to change without notice

441 01 202301

Air Openings and Connecting Ducts
1.

Requirements

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

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

Figure 8 illustrates how to provide combustion and ventilation air when two permanent openings, one inlet and one
outlet, are used.

Connect ducts or openings directly to the outdoors.

When screens are used to cover openings, the openings
MUST be no smaller than 1/4" (6.4 mm) mesh.

The minimum dimension of air ducts MUST NOT be less
than 3" (76 mm).

When sizing grille, louver or screen, 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. Screens shall have a mesh size not smaller than 1/4"

One opening MUST commence within 12" (305 mm) of
the floor and the second opening MUST commence
within 12" (305 mm) of the ceiling.

(76mm).

Size openings and ducts per Table 1.

Outdoor Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
ThisinstallationNOT approvedin Canada
Vent

Gas Vent _,.Gable
/Ventilated

AtticS.

T9pAbove Insulation_
I

I TM

I sOffit
Vent

I Io sl

_u ,cI

_t"_"

,._et

3"I

I'_-°'1

Air (2)

Outlet Air (1)

o°s

Outlet

Air(l)

Outlet
Air (2)

Inlet

Minimum One Inlet and One Outlet Air Supply is Required
May be in and Combination Shown

Air (1)

Air (2)

Inlet Air Opening Must be Within12"(300mm} of floor
Outlet Air Opening Must be Within12"(300mm} of ceiling
(1} 1 Square Inch per 4000 BTUH
(2} 1 Square Inch per 2000 BTUH

Horizontal duct openings reguire 1 square inch of free
area per 2,000 BTUH (11 cmZ/kW) of combined input for
all gas appliances in the space (see Table 1).

Vertical duct openings
ing with the outdoors
per 4,000 BTUH (5.5
gas appliances in the

or openings directly communicatrequire 1 square inch of free area
cm2/kW) for combined input of all
space (see Table 1).

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.
4,

Combination

of Indoor and Outdoor Air shall have:

Indoor openings that comply with the Indoor Combustion Air Method below and

When one permanent outdoor opening is used, the opening
requires:

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

1 sq. in of free area per 3,000 BTUH (7 cm2/kW) for combined input of all gas appliances in the space (see
Table 1) and

Outdoor openings sized as follows.
1) Calculate the Ratio of all Indoor Space volume
divided by required volume for Indoor Combustion
Air Method.

not tess than the sum of the areas of all vent connectors
in the space.

The opening shall commence within 12" (305 mm) of the top ofthe
enclosure. Appliances shall have clearances of at least 1" (25
mm) from the sides and back and 6" (152.4mm) from the front.

44101 202301

2)
3)

Outdoor opening size reduction Factor is 1 minus
the Ratio in 1) above.
Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion
Air Method
above multiplied by reduction Factor.

Specifications are subject to change without notice

Free Area
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

BTUH(kW)
Input
Rating

Minimum
FreeAreaRequired
for EachOpening
or DucttoOutdoors
TwoVerticalDuctsor
SingleOpening
Openings
BTUH(kW)
BTUH(kW)

TwoHorizontal
Ducts
BTUH(kW)
sq.in./2,000(1 cm2/.09)

50,000 (14.65)

25sq.in. (161

75,000 (21.98)

37.5sq.in.(242

sq. in./3,000 (1 cm2/.135)

16.7sq.in.(108

cm2)

12.5sq.in. (81 cm 2)

cm2)

25sq.in. (161 cm2)

cm2)

100,000 (29.31)

50sq.in. (322 cm2)

33.3sq.in.(215

cm2)

125,000 (36.63)

62.50sq.in. (403 cm2)

41.7sq.in.(269

cm2)

150,000

sq. in./4,000(1 cm2/.18)

75sq.in.

RoundDuct
BTUH(kW)
sq.
in./4,000(6.5cm2/.18)

18.75sq.in.(121
25sq.in.(161

cm2)

31.25sq.in. (202 cm2)

50sq.in.

37.5sq.in.

4" (101.6mm)
5" (127mm)
6" (152.4mm)
7" (177.8mm)

7" (177.8mm)

EXAMPLE: Determining Free Area
Furnace

Water Heater

100,000
29.31

Total Input

30,000
8.8

Furnace

(130,000 + 4,000)
(38.11 + .18)

(130,000 + 2,000)
(38.11 + .09)

Water Heater

100,000
29.31

Standard and Known-Air-Infiltration Rate Methods
© NFPA & AGA
Indoor air is permitted for combustion and ventilation, if the Standard or Known-Air-Infiltration
Rate Method is used.

CARBON MONOXIDE POISONING HAZARD
Failure to supply adequate combustion
result in personal injury or death.

air could

Most homes will require additional air from
outdoors for combustion and ventilation. A space
with at least 50 cubic feet per 1,ODDBTUH (4.8 cubic
meters per kW) 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.

=
=

65 Sq. In. Horizontal
423 cm2 Horizontal

The Standard Method may be used, if the space has no tess volume than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per kW)
of the maximum input ratings for all gas appliances installed in the
space. The standard method permits indoor air to be used for
combustion and ventilation air.
The Known Air Infiltration
Rate Method shall be used if the infiltration 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 volume for the space.

MINIMUM SPACE VOLUME FOR 100% COMBUSTION AND VENTILATION AIR FROM INDOORS
OtherThanFan-AssistedTotal
Fan-assisted
Total
30,000BTU
40,000BTU
50,000BTU
50,000BTU
75,000
100,000BTU
125,000BTU
150,000BTU
(8,790kW)
(11,720kW)
(14,650
kW)
(14,650kW)
(21,975kW)
(29,300kW)
(36,625kW)
(43,950kW)
ft3(m3)

ACH

0.60

1,050 (29.7)

1,400 (39.2)

1,750 (49)

1,250 (35)

1,875 (52.5)

2,500 (70)

3,125 (87.5)

3,750 (105)

0.50

1,260 (35.3)

1,680 (47.04)

2,100 (58.8)

1,500 (42)

2,250 (63)

3,000 (84)

3,750 (105)

4,500 (126)

0.40

1,575 (44.1)

2,100 (58.8)

2,625 (73.5)

1,875 (52.5)

2,813 (78.8)

3,750 (105)

4,688 (131.3)

5,625 (158)

0.30

2,100 (58.8)

2,800 (78.4)

3,500 (98)

2,500 (70)

3,750 (105)

5,000 (140)

6,250 (175)

7,500 (210.6)

0.20

3,150 (88.2)

4,200 (117.6)

5,250 (147)

3,750 (105)

5,625 (157.5)

7,500 (210)

9,375 (262.5)

11,250 (316)

0.10

6,300 (176.4)

8,400 (235.2)

10,500 (294)

7,500 (210)

11,250 (315)

15,000 (420)

18,750 (525)

22,500 (632)

0.00

NP = Not Permitted
Table 2 Minimum Space Volumes were determined by using the
following equations from the National Fuel Gas Code NFPA
54/ANSI Z223.1-2006, 9.3.2.2:
1.
For other than fan-assisted appliances such as a draft
hood-equipped water heater,

32.5 Scj. In. Vertical
210 cmL Vertical

Total Input

30,000
8.8

Indoor CombustionAir

,::'

=
=

ACH

°sou
eOVoumOo,.e
> '0''( '°t"er
)
--

ACH

.293 kW

2.
For fan-assisted
appliances (such as this furnace), calculate using the following equation:

1000 BTUH

Specifications are subject to change without notice

441 01 202301

Required Volume

RequiredV°lume

fan_

15ft3
ACH

(

"42m3
ACH

(

If an
1000 BTUH

)

If an
.293 kW

•

•
For fan-assisted

appliances such as this furnace,

If:
] other = combined input of all other than fan-assisted
appliances in BTUH
I fan
BTUH

combined

input of all fan-assisted

appliances

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.
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 remain open and NOT have any means of being
closed off. Ventilation openings to outdoors MUST be at least

1 square inch of free area per 4,000 BTUH of total input rating
for all gas appliances in the space.
In spaces that use the Indoor Combustion
Air Method, 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 Outdoor
Combustion Air Method:
Unusually tight construction is defined as Construction with
1. Wails and ceilings exposed to the outdoors have a continuous, sealed vapor barrier. Openings are gasketed or
sealed and
2.
Doors and openabte windows are weather stripped and
3. Other openings are caulked or sealed. These include
joints around window and door frames, between sole
plates and floors, between walt-ceiling joints, between
wall panels, at penetrations for plumbing, electrical and
gas lines, etc.

VentilationAir
Some provincial codes and local municipalities require ventilation
or make-up air be brought into the conditioned space as replacement air. Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60 °
continuously, or 55 ° on an intermittent basis 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.

5. Gas Vent Installation
3.

CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace could result
in personal injury or death.
Use methods described here to provide combustion and ventilation air.

Install the vent in compliance with codes of the country having jurisdiction, local codes or ordinances and these instructions.

This Category ! furnace is fan-assisted.
Category ! furnace definition: A central furnace which operates
with a non-positive vent static pressure and with a flue loss not
less than 17 percent. These furnaces are approved for commonventing and multi-story venting with other fan-assisted or draft
hood-equipped
appliances in accordance with the NFGC or
NSCNGPIC.

CategoryI Safe VentingRequirements
Category [ furnace vent installations shall be in accordance with
Parts 10 and 13 of the National Fuel Gas Code (NFGC), NFPA
54/ANSI Z223.1-2006; and/or Section 8 and Appendix C of the
CSA B149.1-05, National Standard of Canada, Natural Gas and
Propane Installation Code; the local building codes; furnace and
vent manufacturer's instructions.
NOTE: The following instructions comply with the NFPA 54/ANSI
Z223.1-2006 National Fuel Gas Code and CSA B149.1 Natural
Gas and Propane Installation code, based on the High-Heat
input rate on the furnace rating plate.
1.

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.
Do NOT vent furnace into any chimney serving an open fireplace or solid fuel burning appliance.
44101 202301

5.
6.
7.
8.

9.
10.

11.
12.
13.

Use the same diameter Category ! connector or pipe as permitted by:
•
by the National Fuel Gas Code Code (NFGC) NFPA
54/ANSI Z223.1-2006 Sections 12 and 13 venting requirements in the United States
or
•
the National Standard of Canada Natural Gas and Propane Installation Code (NSCNGPIC) CSA B149.1-05
Section 8 and appendix C venting requirements in Canada.
Push the vent connector onto the furnace flue collar of the
venter assembly until it touches the bead (at least 5/8" overlap) and fasten with at least two field-supplied, corrosion-resistant, sheet metal screws located at least 140° apart.
Keep vertical Category ! vent pipe or vent connector runs as
short and direct as possible.
Vertical outdoor runs of Type-B or ANY single walt vent pipe
below the roof line are NOT permitted.
Slope all horizontal runs upwards from furnace to the vent terminal a minimum of 1/4" per foot (21 mm/m).
Rigidly support all horizontal portions of the venting system
every 6' (1.8m)or less using proper clamps and metal straps
to prevent sagging and ensure there is no movement after
installation.
Check existing gas vent or chimney to ensure they meet
clearances and local codes. See Figure 1
The furnace MUST be connected to a factory built chimney or
vent complying with a recognized standard, or a masonry or
concrete chimney lined with a lining material acceptable to
the authority having jurisdiction. Venting into an unlined
masonry chimney or concrete chimney is prohibited.
See the Masonry Chimney Venting section in these instructions.
Fan-assisted combustion system Category ! furnaces shall
not be vented into single-wall metal vents.
Category ! furnaces must be vented vertically or nearly vertically, unless equipped with a listed mechanical venter.
Vent connectors serving Category I furnaces shall not be
connected into any portion of mechanical draft systems operating under positive pressure.

Specifications are subject to change without notice

Ventingand CombustionAir Check
NOTE: When an existing Category ! furnace
placed, the original venting system may no
properly vent the attached appliances, and to
adequate combustion air for all appliances,
LOWING CHECK.

VentCheck

is removed or relonger be sized to
make sure there is
MAKE THE FOL-

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
....

Vent Pipe --_

Water Heate_
CARBON MONOXIDE

POISONING

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, NFPA
54/ANSI Z223. 1-2006 or CSA B149. 1, Natural Gas and Propane Installation Code and these instructions. Determine
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. Follow the 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 9)
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, NFPA 54/ANSI
Z223. 1-2006 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.

Draft Hood

V_('-"

NOTE: If flame pulls towards draft
sufficient infiltration air.

Match

ood, this indicates

Ventingto ExistingMasonryChimney
NOTE: The tables and notes referred to below are found in the
most recent printing of the NFGC venting tables.
Use the NFGC or NSCNGPIC Tables to size the chimney or vent.
Dedicated venting of one fan assisted furnace into any masonry chimney is restricted. A chimney must first be lined with
either Type-B vent sized in accordance with NFPA 54/ANSI
Z223.1-2006 tables 13.1 or13.2 or a listed, metal lining system,
sized in accordance with the NFPA 54/ANSI Z223.1-2006 section
13.1.7 for a single appliance or 13.2.19 for multiple appliances or
CSA B149.1-05 Annex C; or venting into a masonry chimney is
permitted as outlined with use of an optional listed masonry chimney kit. (See Section 7. Masonry Chimney Venting of these instructions)
Listed, corrugated metallic chimney liner systems in masonry
chimneys shall be sized by using N FPA 54/ANSI Z223.1-2006 or
CSA B149.1-05 tables for dedicated and 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 5% of the vent capacity for each bend
up to 45 ° and 10% of the vent capacity for each bend from 45 ° up
to 90 ° .
NOTE: Two(2) 45 ° elbows are equivalent to one (1) 90 ° elbow.

CombinedVenting into a MasonryChimney
Venting into a masonry or concrete chimney is only permitted as outlined in the NFGC or NSCNGPIC venting tables.
Follow all safe venting requirements.
NOTE: See Masonry Chimney Venting section.

Venting

CategoryI FurnacesWith ExternalPower
Venters
In order to maintain a Category ! classification of fan-assisted furnaces when vented horizontally with sidewall termination, a power
venter is REQUIRED to maintain a negative pressure in the venting system.
In the U.S.: Per the NFPA 54/ANSI Z223.1-2006, a listed power
venter may be used, when approved by the authority having jurisdiction.
In Canada: Only power venters approved by the power ventor
manufacturer and where allowed by the authority having jurisdiction may be used
Please consult the Fields Controls Co. or Tjernlund Products, Inc.
for power venters certified for use with this furnace.

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:

6. Horizontal

Typical Gas

Vent Termination
Venting Through a Non-Combustible and
Combustible Wall
Consult External Power Venter manufacturer instructions.
Select the power venter to match the Btuh input of the furnace being vented. Follow all of the manufacturer's installation requirements included with the power venter for:
•
venting installation,
•
vent terminal location,
•
preventing blockage by snow,
•
protecting building materials from degradation by flue gases,
•
see Figure 10 for required vent termination.
NOTE: 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 walkways.

Specifications are subject to change without notice

441 01 202301

Other than Direct Vent Termination Clearance
.......-r ...............
/
/ i

..............
.............

//
/'
//
,/

A
25-24-65-2

VENTTERMINAL

Item

%X/'
A R SUPPLY
/_

Clearance Descriptions

AREA WHERE TERMINAL IS NOT PERMITED

NLET

Canadian Installation (1)

U.S. Installation (2)

Clearance above grade, veranda, porch, deck, balcony, or
anticipated snow level

12 inches (30cm) #

12 inches (30 cm)

Clearance to a window or door that may be opened

6 inches (15 cm) for appliances -< 10,000 Btuh (3 kW)
12 inches ( 30 cm) for appliances > 10,ooo Btuh (3 kWO)
and -< 100,go0 Btuh (30 kW), 36 inches (91 cm) for
appliances > t00,000 Btuh (30 kW)

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

Clearance to a permanently closed window

Vortical clearance to a ventilated soffit located above the

electrical meter or gas service regulator assembly

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

3 feet (91 cm) w_thin 15 feet (4.5 m) above the meter/regulator
assembly

Clearance to service regulator vent outlet

3 feet (91 ore)

Clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other appliance

6 inches
(15 cm) for appliances
-< 10,000
Btuh (3 kW)
12 inches
( 30 cm) for appliances
> 10,000
Btuh (3 kW0)

terminal within a horizontal distance of 2"(61cm) tram the
centerline of the terminal
E

Clearance to an unventilated soffit

Clearance to an outside corner

Clearance to an inside corner

Clearance to each side of the centerline extended above

and -< 10Or000 Btuh (30 kW)
36 inches
(91 cm) for appliances
K

Clearance to a mechanical air supply inlet

Clearance under a veranda, porch, deck, or balcony

Clearance
below
vent,

(2.)

vent terminal

side

of the

to the vent

or other

direct
terminal

appliances

Clearance

from

Clearance
driveway

above
located

centerline

of the furnace

or other appliance's

Clearance
vent,

(1.)

to each

a plumbing

intake

of a dryer

vent

cm)

opening.

3 feet

(91 cm) above

7 feet

(2.13m)

or to the side

of opening:

1 foot

(30 sin)

(30 kW)
if wi_in

10 feet

(3 m horizontally)

heater

water

heater

or exhaust.

stack

paved sidewalk
or paved
on public property

with the current

CSA

In accordanoe

with the current

NFPA 54/ANSI

roof

or water

Btuh

12 inches(30

above

> 100,000

(t .2 m) below

above

or exhaust.
vent,

intake

In accordance

(46 am) above

extended

to a dryer

vent

direct

5 feet(1.83

4 feet

B149.1,

7 feet

Natural
Z223.1

Gas

and

Predane

, National

Fuel

(2.13m)**

Installation
Gas

Code

18"

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 NFPA 54/ANSI Z22S.1 or CSA B 149. t, clearances shall be in accordance with local installation codes and the requiremenls of the gas supplier and the
Manufacturer's installation instructions.

A vent shall not terminate above 8. sidewalk or paved driveway that is located between two single family dwellings and serves beth dwellings.

Notes:
t.

The vent for this appliance shall not terminate
a. Over publicwalkways; or
b. Near soffit vents or crawl space vents or other areas where condensate er vapor could create a nusiance or hazard or property damage: or

When locating vent terminations,

c. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
Recirculation
3

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

can cause poor combustion,

inlet condensate

Avoid venting under a deck or large overhang.

44101 202301

Recirculatien

problems, and accelerated corrosion of the heat exchangers.
could occur and cause performance

or system problems.

Specifications are subject to change without notice

A05013

7. Masonry Chimney Venting
Chimney Inspection
All masonry chimney construction must conform to Standard
NFPA 211-2006 and to any state or local codes applicable. The
chimney must be in good condition and a complete chimney inspection must be conducted prior to furnace installation. If the inspection
reveals damage or abnormal
conditions,
make
necessary repairs or seek expert help. See "The Chimney Inspection Chart" Figure 11. Measure inside area of tile-liner and exact
height of chimney from the top of the chimney to the highest appliance flue collar or drafthood outlet.

Connector Type
To reduce flue gas heat loss and the chance of condensate problems, the vent connector must be double-wall Type B vent except
as specified in the listed kit.

Venting Restrictions for Chimney Types

If a clay tile-lined masonry chimney is being used and it is exposed to the outdoors below the roof line, relining might be required. Chimneys shall conform to the Standard for Chimneys,
Fireplaces, Vents, and Solid Fuel Burning Appliances NFPA
211-2006 in the United States and to a Provincial or Territorial
Building Code in Canada (in its absence, the National Building
Code of Canada) and must be in good condition.
U.S.A.-Refer
to Sections 13.1.8 and 13.2.20 of the NFPA
54/ANSI Z223.1-2006 orthe authority having jurisdiction to determine whether relining is required. If relining is required, use a
properly sized listed metal liner, Type-B vent, or a listed alternative venting design.
NOTE: See the N FPA 54/AN SI Z223.1-2006, 13.1.8 and 13.2.20
regarding alternative venting design and the exception, which
cover
installations
such as the Chimney
Adapter
Kits
NAHA001DH and NAHA002DH, which are listed for use with
these furnaces.

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

The Chimney Adapter Kit are listed alternative venting design for
these furnaces. See the kit instructions for complete details.

Exterior Chimney - has one or more sides exposed to the outdoors below the roof line. All installations with a 99% Winter Design Temperature* below 17°F (-8°C) must be common vented
only with a draft hood equipped Category ! appliance.

Canada (and U.S.A.)-This furnace is permitted to be vented into
a clay tile-lined masonry chimney that is exposed to the outdoors
below the roof line, provided:

The 99% Winter Design Dry-Bulb (db) temperatures are
found in the 2005 ASHRAE Fundamentals Handbook CD
and Chapter 28.

CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD

Vent connector is Type-B double-wall,

This furnace is common vented with at least 1 draft hoodequipped appliance, and

The combined appliance input rating is less than the maximum capacity given in Table A, and

The input rating of each space-heating appliance is greater
than the minimum input rating given in Table B for Masonry
Chimneys for the local 99% Winter Design Temperature.
Chimneys having internal areas greater than 38 square
inches require furnace input ratings greater than the input
ratings of these furnaces. See footnote at bottom of Table
B, and

The authority having jurisdiction

Failure to properly vent this furnace could result in
personal injury, death and/or property damage.
These furnaces are CSA (formerly AGA and CGA)
design-certified
for
venting into exterior clay
tile-lined
masonry chimneys with a factory
accessory Chimney Adapter Kit.
Refer to the
furnace rating plate for correct kit usage. The
Chimney Adapter Kits are for use with ONLY
furnaces having a Chimney Adapter Kit number
marked on the furnace rating plate.

and

approves.

If all of these conditions cannot be met, an alternative venting design shall be used, such as the listed chimney adapter kit with a
furnace listed for use with the kit, a listed chimney-lining system,
or a Type-B vent.

Specifications are subject to change without notice

441 01 202301

Exterior Masonry Chimney,
FAN+NAT Installations with
Type-B Double-Wall Vent Connectors
© NFPA & AGA

Table ACombined Appliance
MaximumInput Rating in
Thousands of Btu per Hr
VENT
HEIGHT

INTERNAL AREA OF CHIMNEY
SQ IN.(cm)

FT(m)
6(1.8)

12(77.4)
74

19(122.6)
119

28(180.6)
178

38(245.2)
257

8(2.4)

130

193

279

10(3)

138

207

299

15(4.6)

152

233

334

20(6.1)

250

368

30(9.1)

404

Table BMinimum Allowable Input Rating of
Space- Heating Appliance in
Thousands of Btu per Hr
VENT
HEIGHT
FT(m)

19(122.6)

28(180.6)

38(245.2)

Local 99% Winter Design Temperature:
17 to 26°F (-8 to -3°C) *

o
I

6(1.8)

141

8(2.4)

111

154

10(3)

125

169

167

212

14.

15(4.6)

20(6.11)

212

258

30(9.1)

362

Local 99% Winter Design Temperature:
5to 16°F (-15 to -9°C) *

o
I

6(1.8)

8(2.4)
10(3)

121

166

135

182

111

149

198

15(4.6)

193

247

20(6.11)

293

30(9.1)

377

Local 99% Winter Design Temperature:
-10 to 4°F (-23 to -16°C) *

'T
o

145

196

8(2.4)

159

213

10(3)

175

231

15(4.6)

283

20(6.11)

333

30(9.1)

6(1.8)

- 11°F
(-24°C)
or lower

Local 99% Winter Design Temperature:
-11°F (-24°C) or lower*
Not recommended

for any vent configuration

The 99% Winter Design Dry-Bulb (db) temperatures are
found in the 2005 ASHRAE Fundamentals Handbook CD
and Chapter 28.

Inspections before the sale and at the time of installation wilt determine the acceptability of the chimney or the need for repair and/or
(re)lining. Refer to "The Chimney Inspection Chart" to perform a
chimney inspection.
44101 202301

Indicates the chimney exceeds the maximum permissible
size in the tables, the chimney should be rebuilt or relined to
conform to the requirements of the equipment being
installed and the authority having jurisdiction.
A chimney without a clay tile liner, which is otherwise in good condition, shall be rebuilt to conform to NFPA 211 or be lined with a UL
listed (ULC listed in Canada) metal liner or UL listed Type-B vent.
Relining with a listed metal liner or Type-B vent is considered to
be a vent-in-a-chase.
If a metal liner or Type-B vent is used to line a chimney, no other
appliance shall be vented into the annular space between the
chimney and the metal liner.

Appliance

INTERNAL AREA OF CHIMNEY
sq. in(cm)
12(77.4)

If the inspection of a previously used tile-lined chimney:
a. Shows signs of vent gas condensation, the chimney should
be relined in accordance with local codes and the authority
having jurisdiction. The chimney should be relined with a
listed metal liner, Type-B vent, or a listed chimney adapter
kit to reduce condensation.
If a condensate drain is required by local code, refer to the NFPA 54/ANSI
Z223.1-2006 Section 12.10 for additional information on
condensate drains.

Application

Requirements

Appliance operation has a significant impact on the performance
of the venting system. If the appliances are sized, installed, adjusted, and operated properly, the venting system and/or the appliances should not suffer from condensation and corrosion. The
venting system and all appliances shall be installed in accordance
with applicable listings, standards, and codes.
The furnace should be sized to provide 100% of the design heating load requirement plus any margin that occurs because of furnace model size capacity increments. Heating load estimates can
be made using approved methods available from Air Conditioning
Contractors of America (Manual J); American Society of Heating,
Refrigerating, and Air-Conditioning Engineers; or other approved
engineering methods. Excessive oversizing of the furnace could
cause the furnace and/or vent to fail prematurely.
When a metal vent or metal liner is used, the vent or liner must be
in good condition and be installed in accordance with the vent or
liner manufacturer's instructions.
To prevent condensation in the furnace and vent system, the following precautions must be observed:
1. The return-air temperature must be at least 60°F db except
for brief periods of time during warm-up from setback at no
lower than 55°F db or during initial start-up from a standby
condition.
2.

Adjust the gas input rate per the installation instructions.
Low gas input rate causes low vent gas temperatures,
causing condensation and corrosion in the furnace and/or
venting system. Derating is permitted only for altitudes
above 2000' (609.6m).
3. Adjust the air temperature rise to the midpoint of the rise
range or slightly above. Low air temperature rise can cause
low vent gas temperature and potential for condensation
problems.
4.
Set the thermostat heat anticipator or cycle rate to reduce
short cycling.
Air for combustion must not be contaminated by halogen compounds which include chlorides, fluorides, bromides, and iodides.
These compounds are found in many common home products such
as detergent, paint, glue, aerosol spray, bleach, cleaning solvent,
salt, and air freshener, and can cause corrosion of furnaces and
vents. Avoid using such products in the combustion-air supply. Furnace use during construction of the building could cause the furnace
to be exposed to halogen compounds, causing premature failure of
the furnace or venting system due to corrosion.
Vent dampers on any appliance connected to the common vent can
cause condensation and corrosion inthe venting system. Do not use
vent dampers on appliances common vented with this furnace.

Specifications are subject to change without notice

CHIMNEY INSPECTION CHART

For additiona(requirements refer to the Nationa(Fue(Gas Code NFPA 54/ANSIZ223.1 2006 and NFPA 211 2006 Chimneys,Firep)aces,Vents, and So))d Fue)Burning App(iancesin
the U.S.A. or to the Canadian InstallationCode CSA-B149.1 in Canada.

Missing mortar
or brick?
condition:

Rebuild
crown

1
with day tile
liner?

(iner or top sea(
sea()n good
condition

Yes

Reline

or reline chimneyas
necessary.

:_epair

Debris in
c)eanout?Mortar,tile,
metal vent, fuel oil
residue?

Mortar or
t)]e debris?

Removemortar
and t)ie debris?

Removemetal vent or liner._oNo

Specifications are subject to change without notice

441 01 202301

8. Gas Supply and Piping
Gas Pressures

iiii,i.iii
i._i_..iiiiiiii.ii..iiiii.i.i..iii.iii.iii.iii.iii.iii.iii.iii.iii.iii.iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii_

FIRE AND EXPLOSION HAZARD

Gas Type

Failure to follow this warning could result in
personal injury, death and/or property damage.

Supply Pressure
Recommended

Natural

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

Max.

Min.

14 in wc

4.5 in wc
1121 Pa)

(3487 Pa)

11 in wc
(2740 Pa)

(3487 Pa)

Propane

7 in wc
(1744 Pa)

14 in wc

11 in wc
(2740 Pa)

Gas Piping Requirements
NOTE: The gas supply line must be installed by a qualified service
technician in accordance with all building codes.

Gas Supply Requirements

NOTE: In the state of Massachusetts.

Gas supply 3ressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas suppliers.
(See Propane Gas Conversion Kit instruction manual for furnaces
converted to Propane gas)
•
•

Use only the Type of gas approved for this furnace. See rating plate for approved gas type.
1/8" NPT plugged tapping, accessible for a test gauge
connection,must be installed immediately upstream of the
gas supply connection to furnace.
A

•

Do not allow minimum supply pressure to vary downward.
Doing so will decrease input to furnace. Refer to Table 3 for
Gas supply. Refer to Table 5 or Table 4 for manifold pressures.

Gas supply connections MUST be performed
censed plumber or gas fitter).

by a li-

When flexible connectors are used, the maximum length
shall not exceed 36" (915 mm).

When lever handle type manual equipment shutoff
valves are used, they shall be T-handle valves.

The use of copper tubing for gas piping is NOT approved
by the state of Massachusetts.

Install gas piping in accordance with local codes, or in the absence of local codes, the applicable national codes.

It is recommended that a manual equipment shutoff valve be
installed in the gas supply line outside the furnace. Locate
valve as close to the furnace as possible where it is readily
accessible. Refer to Figure 12.

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

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

Use ground joint unions and install a drip teg no less than 3"
long to trap dirt and moisture before it can enter gas control
valve inside furnace.

• Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set
by gas suppliers.
• Gas input must not exceed the rated input shown on the rating plate. Overfiring wilt result in failure of heat exchanger
and cause dangerous operation.

Typical Gas Piping and Adding Propane Low Pressure Switch

_'_..

,
DripLegandUnion,Unionshould
beoutsidethe
cabinet.Manualshut-offvalveMUSTbeupstream
of
dripleg,union,andfurnace•
"................

Osee,owsan° ",,°,.r.,,.n,,e,ocon-...........

. .

•

....

......... _.

nectvalveto pipingwhenusingnghtsidegas-"_.
pipeentry.
_

Propane
Lowpressure
switchREQUIRED ............ ---

_-_?
_ _-_--.

_'__\'/

_
/_'_

Manualshut-off
valve _.
_

_
_
GJ

__%

_"._ .... _

"_ ...... _
_

__
.._.

i;_
"_--_

_\_-_
_I_ J

_"'_
_

Alternative

installation
-_-_'
_L_.
_./
_

_\_

_"}Jl/

-'\b
",_-_

- i

25-24-86

* Union may be installed inside the cabinet when necessary because of clearances.
44101 202301

Specifications are subject to change without notice

;

1i;

]

J)i

; i

Gas Valve with Elbows
(*8MPT/*SMPV)

FIRE HAZARD
Failure to follow this warning could
result in
personal injury, death and/or property damage.
Use wrench to hold furnace gas control valve
when turning elbows and gas line to prevent
damage to the gas control valve and furnace.

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

to pre-

NOTE: If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector
which has previously served another gas appliance.
7.

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

Properly size gas pipe to handle combined appliance toad
or run gas pipe directly from gas meter or Propane gas regulator.

Install correct pipe size for run length and furnace rating.

25 25 03a

iiiiiiii;_iiiiiiiii!iiiii_i_i1iiiIHi;;iiI!!!!i!iiHi1ii_iiiiiii!i!_i1iiiiiiiiiiiiU1iii_iii!iiiiiiii1iii!i!_i1iii
_i

Gas
a,ve
wit.E,bows
(*8MPT/*8MPV)

10. Measure pipe length from gas meter or Propane second
stage regulator to determine gas pipe size.

Left Side Gas Supply Piping
Gas line can be installed directly to the gas valve through the hole
provided in the left side of the cabinet. See Figure 12

Gas supply line then can be run directly into opening of elbow.

Right Side Gas Supply Piping

Piping with Close Nipples and Standard Elbows

Two(2) 90 ° street elbows or two(2) 90 ° standard elbows and
two(2) close nipples are required for right side gas supply. See
Figure 12.

Assemble elbows and nipples similar to street elbows shown
in Figure 13.

Follow steps 2 through 4 Piping with Street Elbows.

Piping with Street Elbows
1.

Assemble the elbows so that the outlet of one(l) elbow is 90 °
from the inlet of the other. The elbows should be tight enough
to be leak proof. An additional 1/4turn will be required at the
end of step 2, see Figure 13.

FIRE OR EXPLOSION HAZARD

Screw elbow assembly into gas valve far enough to be leak
proof. Position elbow assembly so that the inlet of the elbow is
at the bottom of the gas valve. An additional 1/2 turn will be
required in step 3. Turn open end of inlet elbow to face the
right side of the furnace (1/4 turn), see Figure 14.

Failure to properly install metal gas connector
could result in personal injury, death and/or
property damage.
A flexible corrugated metal gas connector must be
properly installed, shall not extend through the side
of the furnace, and shall not be used inside the
furnace.

Turn assembly an additional 1/2 turn to position inlet near the
top of the gas valve. In line with gas opening on right side of
furnace, see Figure 12 and Figure 15.

Black iron pipe shall be installed at the furnace gas
control valve and extend a minimum of 2" outside
furnace.

, ows

Additional Propane Piping Requirements

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

•

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

•

If copper tubing is used, it MUST comply with limitation set
in local codes, or in the absence of local codes, the gas
codes of the country having jurisdiction.

•

Two-stage

regulation of Propane gas is recommended.

PropaneConversion

f
25 23

23c

An accessory kit shall be used to convert to propane gas use, see
the furnace rating plate for the Propane conversion accessory kit
part number.

Specifications are subject to change without notice

441 01 202301

CARBON MONOXIDE POISONING HAZARD

Ensure furnace is equipped with the correct main burner orifices.
Refer to Table 5 or Table 4 for correct orifice size and manifold
pressure for a given heating value and specific gravity for natural
and propane gas.

Failure to follow this warning could result in personal injury, death and/or property damage.
NOx inserts for use with Natural Gas units
ONLY. If Propane Gas is required, NOx inserts must
be removed.

Operation Above 2000ft (609.6m)Altitude

FIRE,
EXPLOSION,
POISONING HAZARD
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
A Propane conversion accessory kit is required
when operating the furnace with Propane gas.

For Propane conversion
sert and discard insert.

CARBON

MONOXIDE

Failure to follow this warning could result in personal injury, death and/or property damage.
This high-altitude gas-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 Tthe applicable national codes.

remove screws that secure the NOx in-

Reinstall screws. See Figure 16
NOTE: It is very important to reinstall the NOx insert mounting
screws.
;i;'iii

Removing

NOx inserts

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

25-24-99a

These furnaces may be used at full input rating when installed at
altitudes up to 2000ft (609.6m). When installed above 2000ft
(609.6m), the High Heat input must be decreased 2% (natural) or
4% (Propane) for each 1000ft (304.8m) above sea level in the
USA. In Canada, the input rating must be derated 10% (natural) or
5% (Propane) for altitudes of 2000 to 4500ft (609.6 to 1371.6m)
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 4 and Table 5 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 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 in the
vertical column and follow across the table until the appropriate
elevation for the installation is reached. The value in the box atthe
intersection of the altitude and heating value provides not only the
manifold pressure but also the orifice size. In the natural gas
tables the factory-shipped orifice size is in bold (42). Other sizes
must be obtained from service parts.
High Altitude Input Rate =
Nameplate Sea Level Input Rate x (Multiplier) [USA]

FIRE OR EXPLOSION HAZARD

Elevation

An open flame or spark could result in personal
injury, death and/or property damage.
Propane gas is heavier than air and will settle and
remain in low areas and open depressions.
Thoroughly ventilate area and dissipate gas. Do
NOT use a match or open flame to test for leaks, or
attempt to start up furnace before thoroughly
ventilating area.

OrificeSizing
NOTE: Factory sized orifices for natural and Propane gas are
listed in the furnace Technical Support Manual.
44101 202301

ft (m)

High Altitude Multiplier
Natural

Gas

Propane Gas

2001' - 3000'
(609.9 - 914.4)

0.95

0.90

3001' - 40OO'
(914.7 - 1219.2)

0.93

0.86

0.91

0.82

O.89

O.78

6001' - 7000'
(1829.1 - 2133.6)

0.87

0.74

7001' - 8000'
(2133.9 - 2438.4)

0.85

0.70

4001' - 5000'
(1219.5-

1524)

5001' - 6000'
(1524.3- 1828.8)

* Based on mid-range

Specifications are subject to change without notice

of elevation.

MANIFOLDPRESSUREAND ORIFICE SIZE FOR HIGH ALTITUDEAPPLICATIONS
NATURAL

GAS MANIFOLD

PRESSURE

MEAN ELEVATION FEET ABOVE SEA LEVEL if(m)
3001to4000
4001to5000
5001to6000
(914.7to 1219.2)
(1219.5to 1524)
(1524.3
to 1828.8)

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
....

HEATING
VALUEat
ALTITUDE
BTU/CU.
FT,
700

0 to2000
(0to609.6)

2001to3000
(609.9to914.4)

Orifice

Mnfld Pres-

No.

sure

(in wc)

Orifice MnfldPressure

Orifice

No.

MnfldPressure

Orifice Mnfld Pressure

No.

HI
_

LO
=

,_ :=

HI
=

:-_

, _:

, _

i..-

i.:_=

875
900
925
950
975
1000
1050
1100

41
42

3.6
3.7

1.7
1.8

41
41
42
42

3.7
3.5
3.6
3.4

1.8
1.7
1.8
1.7

41
41
42
42
42

7001to 8000
(2133.9to 2438.4)

Orifice

Mnfld Pres-

Orifice

No.

sure

No.

MnfldPressure

3.7

1.8

:=-

3.7

1.8

3.4

1.7

i,;::4

.. _

3.5

1.7

3.6

1.7

775

800
825
850

Mnfld Pressure

No.

725

750

Orifice

No.

6001to 7000
(1829.1
to 2133.6)

3.6

1.7

3.6

1.8

3.3

1.6

3.6
3.4
3.6
3.4
3.2

1.8
1.7
1.7
1.6
1.6

42
42
42
42
43

3.7
3.5
3.3
3.1
3.6

1.8
1.7
1.6
1.5
1.7

42
42
43
43
43

3.4
3.2
3.7
3.5
3.3

1.7
1.6
1.8
1.7
1.6

42
43
43
43
44

3.1
3.6
3.4
3.2
3.5

1.5
1.8
1.7
1.6
1.7

3.7

1.8

3.5

1.7

3.3

1.6

3.7

1.8

3.4

1.7

3.1

1.5

3.3

1.6

3.5

1.7

3.3

1.6

3.1

1.5

3.5

1.7

3.2

1.6

3.4

1.7

3.1

1.5

3.7

1.8

3.2

1.6

3.6

1.8

3.3

1.6

3.5

1.7

3.2

1.6

3.6

1.7

3.5

1.7

3.7

1.8

3.4

1.7

3.1

1.5

3.3

1.6

3.7

1.8

3.4

1.7

3.2

1.6

3.3

1.6

3.1

1.5

3.3

1.6

3.6

1.8

3.6

1.7

3.5

1.7

3.2

1.6

3.6

1.8

Conversion:
1in wc= 249Pa
NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI
Z223.1-2006/NFPA 54-2006 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1-05.
*

In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design-certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to
1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 4 and Table 5.

The burner orifice part nos. are as follows:
Orifice #41
1096942
Orifice #42
Orifice #43
1011377
Orifice #44
Orifice #45
1011353
Orifice #54
Orifice #55
1011354
Orifice #56
PROPANE
HEATING VALUE
at ALTITUDE
BTU/CU. FT.
2500
Orifice Size

0to 2000
(0to 609.6)

GAS

High Altitude Air PressureSwitch

1011351
1011352
1011376
1011355

MANIFOLD

2001to3000
(609.9to914.4)

The factory-installed
pressure switches need NOT be changed
for any furnace installations from sea level up to and including
8,000' (24.8.4 m) altitude.

PRESSURE

(in wc)

MEAN ELEVATION FEET ABOVE SEA LEVEL if(m)
3001to4000
4001to 5000
5001to6000
6001to 7000
7001to 8000
(914.7to1219.2) (1219.5to 1524) (1524.3
to 1828.8) (1829.1
to 2133.6) (2133.9
to 2438.4)

"'1"° "'1.o .,1.o.,1.o.,1.o.,1.o.,1.o

10.0

4.9

#54

10.0

4.9

9.0

#54

4.4

#54

10.0

4.9

9.4

#55

4.6

#55

8.5

4.2

#55

4.9

#56

Conversion:
1in wc= 249Pa
NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI
Z223.1-2006/NFPA 54-2006 or National Standard Of Canada, Natural Gas And Propane Installation Code CSA B149.1-05.
*
In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design-certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to
1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 4 and Table 5.

Changing Orifices
FIRE,
EXPLOSION,
POISONING HAZARD

CARBON

MONOXIDE

After disconnecting power and gas supply to the furnace,
remove the burner compartment door, exposing the burner
compartment.

Disconnect gas line from gas valve so manifold can be removed.

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

Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do not discard any screws.
See Figure 17.

Specifications are subject to change without notice

441 01 202301

FinalGas Piping Check

Manifold

FIRE OR EXPLOSION HAZARD
Failure to follow this warning
personal injury and/or death.

could result

Never test for gas leaks with an open flame. Use a
commercially
available
soap solution made
specifically for the detection of leaks to check all
connections.

RISQUE D'EXPLOSION
5.

Carefully remove the manifold assembly.

Remove the orifices from the manifold and replace them
with proper sized orifices. See Figure 18.

Tighten orifices so they are seated and gas tight. See
Figure 18.

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

Le fait de ne pas suivre cet avertissement pourrait
entrainer des dommages corporels et / ou la mort.
Ne jamais examiner pour les fuites de gaz avec une
flamme
vive.
Utilisez
plut6t
un
savon
fait
specifiquement pour la detection des fuites de gaz
)our verifier tous les connections.
1,

The furnace and the equipment shut off valve must be disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess
of 1/2" PSIG (3.5 Pa). Close the manual shut-off valve before testing at such pressures.

The furnace must be isolated from the gas supply system
by closing the equipment shut off valve during any pressure
testing of the gas supply system at test pressure equal to or
less than 1/2" PSI (3.5 Pa).

When installation is complete, test all pipe connections for
leaks with the gas pressure less than 1/2" PSlG (3.5 Pa) to
the gas valve.

Apply a commercial soap solution to all joints to test for
leaks. Correct any leaks indicated by bubbles.

Correct even the smallest leak at once.

Check for leaks at gas valve and orifice connections to the
burner manifold along with the pilot tube connections to the
valve and pilot assembly while the furnace is operating.

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

ET D'INCENDIE

Orifices

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Measure from face of orifice

9. Electrical Wiring
ELECTRICAL

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.

SHOCK HAZARD

Failure to turn off power could result in personal
injury or death.
Turn OFF electrical power at fuse box or service
panel before making any electrical connections
and ensure a proper ground connection is made
before connecting line voltage.

NOTE: Furnace will not have normal operation is line polarity is
reversed. Check ALL field and control connections prior to operation.

PowerSupplyWiring
The furnace MUST be electrically wired and grounded in accordance with local codes, or in the absence of local codes, with the
National Electrical Code (NEC), NFPA 70-2008 in the U.S., or the
Canadian Electrical Code (CEC), CSA C22.1 in Canada.
The power supply to the furnace connections must be between
104 VAC and 127 VAC during furnace operation for acceptable
performance.
44101 202301

Copper conductors shall be used. Line voltage wires should
conform to temperature limitation of 35 ° C rise. Wire and circuit
breaker sizing shall be based on the ampacity of the furnace electrical components plus the amps for all installed accessories (1.0
amps total for EAC and HUM). Ampacity can be determined by using the NEC or CEC.

Furnace must be installed so the electrical components are protected from water and connected to its own separate circuit.

Junction Box (J- Box) Relocation
The J-Box is installed in the burner compartment on left side of
casing. An alternate J-Box location on right side can be used.
1.

Remove and save two screws holding J-Box to casing.

Specifications are subject to change without notice

Move large hole plug from right to left J-Box location.

*8MPV

Clip wire tie holding J-Box wires if needed.

Move J-Box to alternate location and attach
screws removed from left side location.

using two

If single-stage cooling is used, the Y and G from the thermostat
must be connected to the control board Y/Y2 and G to energize
cooling blower speed.

Position all wires away from hot surfaces, sharp edges, and
moving parts. Do not pinch J-Box wires or other wires when
reinstalling burner compartment door.

If two-stage cooling is used, the Y1, Y2, G off the thermostat must
be connected to Y1 of the tap select interface board for Low Cooling, Y/Y2 of the furnace control board for High Cooling and G of the
furnace control board for continuous fan speed.

Thermostat

Optional Equipment

Heating
The two-stage
furnace control board wilt operate with either a
single stage or a two-stage heating thermostat and wilt provide
two-stage heating operation.
For single-stage thermostat installations, the R and W wires
from the thermostat connect to the R and Wl connections on the
furnace control board.
Note: The TT (Thermostat Type) SW1 DIP switch # 3 should be in
the off position for the furnace to operate properly with a singlestage thermostat. Failure to change DIP switch with single-stage
thermostat wilt result in Low Heat operation ONLY. (See
Figure 21 and wiring diagram)
During operation, the furnace will operate on tow Heat for up to12
minutes. If the heat request exists for more than 12 minutes, the
furnace wilt automatically shift to the high Heat mode for the remaining duration of the heating cycle.
For two-stage thermostat installations, the R, Wl and W2 wires
from the thermostat connect to the R, Wl and W2 connections on
the furnace control board. Set TT SW1 DIP switch #3 to ON position. During operation, the furnace will shift from Low Heat to High
Heat as requested by the thermostat. (See Figure 19, Figure 20
and wiring diagram)
Heat anticipator setting will need to be measured if 24VAC humidifier is installed. Measure current in series from R to Wl at the thermostat. Be sure 24VAC humidifier is wired up to control. Allow
furnace to operate for two minutes before recording the AC amperage reading. Set anticipator on thermostat to recorded value.
Thermostat location has an important effect on the operation of
the furnace. Follow instructions included with thermostat for correct mounting and wiring.
Low voltage connections to furnace must be made on terminal
board to furnace control board. (See Figure 19 and Figure 20)

Cooling
*8MPT
If cooling is used, the Y and G from the thermostat must be connected to the control board Y/Y2 and G to energize cooling blower
speed.
NOTE: MPT models are not two-stage

cooling compatible.

All wiring from furnace to optional equipment MUST conform to
local codes or, in the absence of local codes with the latest edition
of The National Electric Code, NFPA 70 and/or The Canadian
Electric Code CSA C22.1. Install wiring in accordance with
manufacturer's instructions. The wiring MUST have a minimum
temperature rating of 105° C.

Humidifier/Electronic Air Cleaner
The furnace is wired for humidifier and/or electronic air cleaner
connection.
HUMIDIFIER - The HUM (24V) terminal is energized when
the tow pressure switch closes on a call for heat. The HUM
(115V) is energized when the inducer is energized.
ELECTRONICAIR CLEANER - EAC is energized when there
is a blower speed call, except it is NOT energized when blower
operates in the hard-wired continuous fan mode.

REDUCED FURNACE LIFE HAZARD
Failure to follow caution instructions may result in
reduced furnace life.
Do NOT exceed 115V/1.0 amp. maximum current
load for both the EAC terminal and the HUM
terminal combined.

Furnace Control Board
The furnace control board has a fixed blower ON delay of 30
seconds for High Heat calls and 45 seconds for Low Heat calls.
The blower OFF timing is factory preset at 140 seconds. If desired,
the fan OFF delay can be reset to obtain the longest delay times
while still maintaining comfort levels. See "Furnace Wiring
Diagram".

Dehumidification- Variable Speed ONLY (*8MPV)
The furnace control board has a dehumidification feature which
reduces cooling airflow by 20% when the DEHUM terminal [1/4"
(6.4mm) male quick connect] is energized by 24VAC and there is a
cooling call. DEHUM may be operated by a thermostat dehumidify
(24VAC for dehumidify) command or a dehumidistat
(switch
closes on call for dehumidification) with one terminal connected to
(Y1 for two-stage
cooling or Y/Y2 for single-speed
cooling
applications) and the other terminal connected to DEHUM

Specifications are subject to change without notice

441 01 202301

Electrical
*8MPV

Connections

Control

Connections

NOTE: Junction Boxcan be mounted to eitherthe left or right side.

115M 60 Hz.

Ground

LowVoltage

I TerminalBoard

I
I

I
i
I

SingleStage
Thermostat

LowVoltage
TerminalBoard
.......

Furnace Control Fuse

I
_

TwoStage

TheLmostat

Variable Speed
Motor

Motor
Control

NOTE:115VAC/60Hz,/single-phase
Operatingvoltagerange*:127VACmax, 104VACrain,

25-25-06

Tap Select Interface Board (*8MPV)

* Permissiblelimits ofvoltage atwhich unit will operatesatisfactorily

Electrical
*8MPT

The 24V circuit contains a 5-amp, automotive-type fuse located
on furnace control board. (See Figure 21) Any electrical shorts to
24V wiring during installation, service, or maintenance may cause
fuse to blow. If fuse replacement is required, use only a fuse of
identical size (5 amp.).

The Tap Select Interface Board is used with the Variable Speed
motor. There are DIP switches (SW2) for continuous blower
adjust, heating blower adjust, cooling blower adjust and cooling
on/off delay profiles. There is a jumper (J1) for slight blower
adjustment, increase (+)/no change (NOM)/decrease (-). There is
a jumper (J2) for airflow selection of Heat Pump EFFICIENCY or
COMFORT. (EFFICIENCY provides no airflow reduction in airflow
whether O is energized or not. COMFORT provides a 10%
reduction in airflow when O is not energized with a cooling call).

Connections

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

115M 60 Hz.

The O terminal is available for use for Heat Pump applications,
desired.

The Y1 terminal (if a two-stage Air Conditioner or two-stage Heat
Pump is used) will provide low cooling blower speed when
energized. (Only Y/Y2 on the furnace control board is used if a
single-stage Air Conditioner or Heat Pump is installed)

25-25-06a
NOTE:115VAC/60Hz,/single-phase
Operatingvoltagerange*:127VACmax, 104VACrain,
* Permissiblelimits ofvoltage atwhich unit will operatesatisfactorily

44101 202301

Specifications are subject to change without notice

10. Ductwork and Filter (Upflow/Horizontal)
Duct InstallationRequirements
When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside of the space containing the furnace, the return air shall also be handled by
duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

CARBON MONOXIDE POISONING HAZARD
Failure to properly seal
personal injury or death.

duct

could

result

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.

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning
personal injury or death.

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

Side Return

result in

Cool air passing over heat exchanger could cause
condensate to form resulting in heat exchanger
failure.

Side connections can be made by cutting out the embossed area
shown in Figure 22. A plugged hole is provided at each furnace
side duct location to help start cutting the opening.

Cutting

could

When the furnace is used with a cooling unit, the furnace
shall be installed parallel with or on the upstream side of the
cooling unit to avoid condensation in the heating element.
With a parallel flow arrangement, the dampers or other
means used to control flow of air shall be adequate to prevent chilled air from entering the furnace. Chilled air going
through the furnace could cause condensation and shorten
furnace life. Dampers (purchased locally) can be either automatic or manual. Manually or automatically operated
dampers MUST be equipped with a means to prevent furnace and air conditioning operation, unless damper is in the
full heat or coot position.

Air Opening

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Knockout
Starting
Hole

Installation of locking-type dampers is recommended in all
branches, or in individual ducts to balance system's air
flows.
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 ° air turn between fan and inlet grille to reduce
noise.

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

•

Ductwork installed in attic or exposed to outside temperatures requires a minimum of 2" (50.8mm) of insulation with
outdoor type vapor barrier.

Duct Design

•

Ductwork installed in an indoor unconditioned space requires a minimum of 1" (25.4mm) of insulation with indoor
type vapor barrier.

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 furnace 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.

Inspection Panel on some models
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the air
stream. This access cover shall be attached in such a manner as
to prevent air leaks.

Filters
•

•

Refer to furnace Technical Support Manual (Blower Data)
for air flow information.

A filter MUST be used.

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

Filters are supplied with these furnaces, and additional filters may
be purchased from your distributor.

Specifications are subject to change without notice

441 01 202301

See Table 6 for required high-velocity

Cabinet
Width
in (mm)

High Velocity
Internal
Filter
in(mm)
Bottom

151/2
(393.7)

191/8
(485.8)
223/4
(577.9)

14X25
(355.6

x 635)

16 X 25 *
(406.4 x 635) *
20 X 25
(508 x 635)*

Air Filter

filter sizes.
Sizes

(max.600 FPM)

External Filter Rack
Bottom
14X25
(355.6

x 635)

NOTE: Disposable, low-velocity filters may be replaced with
washable, high-velocity filters providing they meet the minimum
size areas for 300 FPM or less. Washable, high-velocity filters
can be replaced ONLY with same type and size filter.
ii

_)}i i

Optional Duct StandoffNAHA001TK
in(mm)

Side+
14 X 25 (355.6 x 635)
or 16 X 25 (508 x 635)*

16 X 25
(406.4 x 635)*
20 X 25
(508 x 635)*

16 X 25
(406.4 x 635)*
16 X 25
(508 x 635)*
_i i2o

_o8

* Greater than 1600 CFM with a maximum of 2000 CFM requires both (left and right)
side return filter racks or for single return in an upflow application,
NAHA001TK.

18_2

must use filter rack

(470) i

See Figure 23.

+ Side return air duct(s) is not permitted with horizontal or downflow furnace installation.

Use either filter type:
•
•

20 x 25 (508
Optional Filter Rack

Washable, high-velocity filters are based on a maximum air
flow rating of 600 FPM.
Disposable, low velocity filters are based on a maximum air
flow of 300 FPM when used with with external filter grille.

REDUCED FURNACE LIFE HAZARD
Failure to follow caution instructions may result in
reduced furnace life.

(175)

Filter

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

ii::

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
24 & Figure 25.

Use of excessively dirty and/or restrictive air filters
may
increase
furnace
operating
temperatures and shorten the life of the furnace.
Filters supplied with the furnace are rated at a
maximum of 600 fpm air velocity and sized for the
furnace's airflow rate. Replacement filters must be
of equivalent type, size, and rating except as
described below.
Disposable, low-velocity filters may be used to
replace washable, high-velocity filters, providing
they are sized for 300 FPM or less.
The furnaces with 1600 or less CFM rating are supplied
with a 16" x 25" (406 x 635mm) high-velocity filter and
rack. On these models the supplied filter may be installed
internally for bottom return or the supplied filter and rack
may be mounted externally for bottom return.
The furnaces with greater than 1600 CFM to 2000 CFM
may require that bottom return or both (left and right) side
returns are used or for single side return in upflow application, must use filter rack NAHA001TK. Two side return filters and racks are required. Filter racks must be mounted
externally. (See Figure 23 and Figure 24.) If return air
must be on one side only, an optional 20" x 25" (508 x
635mm) filter standoff rack kit can be used. (See
Figure 23.) For bottom return, an internal filter can be used
or a filter rack kit can be mounted externally.

Filter

25-23-05-1

Filters Installed on Two Sides
UsingTwo
Filter Racks

See Technical Manual, Circulation Air Blower Data for additional information.
NOTE: The 20" x 25" (508 x 635mm) standoff side filter rack
gives more filter area but does not provide more air. (See
Figure 23.) To achieve 2000 CFM 2 side returns may be required.
(See Figure 25.)
44101 202301

Specifications are subject to change without notice

25-23-05-3
\

Filter
Filter

Internal Filter in Bottom Return Installation
When installing _bottom-mounted filter inside the furnace, install
the filter clips on the edge of the bottom duct opening with the wider end of the clips toward the blower, as shown in Figure 26. Clips
may be obtained from your distributor or fabricated from sheet
metal (Figure 27). Insert filter into side clips first and push filter
back until it is fully engaged into back clip.

Bottom Mounted Filter

Center Clip

side to side

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

Addition Of Air Conditioning
When a refrigeration coil is used in conjunction with this furnace, it
must be installed on the discharge side of the furnace to avoid
condensation on the heat exchanger. All furnaces are designed
with a break-away duct flange on the supply air side of the furnace. This allows for installation in the horizontal right or downflow
applications. The coil installation instructions must be consulted
for proper colt location and installation procedures. With a parallel
flow arrangement, dampers must be installed to prevent chilled air
from entering the furnace. If manually operated dampers are
used, they must be equipped with a means to prevent operation of
either unit unless the damper is in full heat or full cool position.
Copper or plastic tubing may be used for the condensate drain
line.

Filter Clip Construction

_._'(38.1) _

--..

\\\

in(mm)

. _,,
-\\\\

;J _7t2)

\>\

26 Ga. Galvanized Steel

"_.\

FAST part number 1008482

_'\_,/

11/16"

(27)

11. Ductwork and Filter (Downflow)
CARBON MONOXIDE POISONING HAZARD
Failure to properly seal
personal injury or death.

duct

could

result

BURN HAZARD
in

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 install vent shield could result in
personal injury or death.
The vent may be hot.

Vent Shield
FIRE HAZARD
Side return air duct(s) could cause excessive
furnace and/or air temperatures,
which could
result in personal injury, death and/or property
damage.
Return air duct is to be connected to only the top of
downflow furnace.

A vent shield is required for all downflow installations. The vent
Must exit out the side of the furnace for all downflow installations.
This places the hot vent pipe (over 300 ° F) within reach of children.
The vent shield attaches to side of furnace to cover vent pipe. See
Figure 4 in "Installation" section.

Outlet Duct Flange
Downflow installations with cased coils require the furnace outlet
duct flange to be bent outward and flat to mate the outlet of the furnace to the cased coil.

Specifications are subject to change without notice

441 01 202301

The Sub-base for Combustible Floors MUST be used when a
downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box.

FIRE HAZARD

The opening in the base is 11/4" (31.8mm) shorter and 11/8"
(28.6mm) narrower than the minimum required size of the
opening in the floor. This is done to maintain a 1" clearance
between the floor and the plenum.

Sub-Bases for Combustible Floors - Furnace Only
Note: When using the subbase for combustible floors, the discharge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the
duct flanges flat onto the furnace casing. DO NOT bend the duct
flanges inward (toward the heat exchangers) as air flow restrictions may occur.

Sub-bases

for Combustible

Fabricate the plenum to the dimensions given in Table 7.
Note that the dimensions given are outside dimensions.

Set the base over the opening in the floor, centering the opening in the base over the opening in the floor. Fasten the base
to the floor with screws or nails. See Figure 28 and
Figure 29.

Drop the plenum through the opening in the base. The flange
of the plenum should rest on top of the combustible floor
base.

Floors Dimensions

Sub-base for Combustible
Floor Dimensions

Sub-base for
Combustible Floors
Part Number

Cut the opening in the floor according to the dimensions in
Table 7 because the base is equipped with locating tabs that
center the base over the opening.

in(mm)

Opening In Floor

1511/16
(398.5)

283/4(730.3)

149/16 (369.9)

16(406.4)

283/4(730.3)

183/16 (462)

16(406.4)

283/4 (730.3)

2113/16(554)

Opening In
Base For Plenum

K _

Typical Plenum
Dimensions

15 (381)

131/2
(342.9)

15 (381)

131/2
(342.9)

15 (381)

171/8
(435.6)

15 (381)

171/8
(435.6)

Subbase for Furnace Only
NAHH001SB

195/16

NAHH002SB

(490.5)
221b/16
(582.6)

NAHH003SB

161/4
(412.8)

145/8
(371.5)

161/4

181/4

(412.8)

(463.6)

16(406.4)

161/4
(412.8)

21//8
(555.6)

15 (381)

19_/4
(501.7)

15 (381)

19_/4
(501.7)

149/16 (369.9)

161/16
(408)

161/4
(412.8)

145/8
(371.5)

15 (381)

131/2
(342.9)

15 (381)

131/2
(342.9)

183/16 (462)

161/16

Subbase for Coil Box
NAHH004SB

153/4
(25.4)

209/16
(522.3)

NAHH005SB

193/8
(181.1)

(522.3)

NAHH006SB

23 (284.2)

209/16

209/16
(522.3)

2113/16(554)

161/4

181/4

(4o8)

(412.8)

(463.6)

161/16
(408)

161/4
(412.8)

21//8
(555.6)

15 (381)
15 (381)

171/8
(435.6)
19_/4
(501.7)

15 (381)
15 (381)

171/8
(435.6)
19_/4
(501.7)

Outside Dimension
BaseSpacer SideTo Side

Exploded View of Sub-Base
Furnace ONLY

: ; r_i_u_'=°;

for

Sub-base for Combustible Floors- Downflow Coil
Adapter Box

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z" _<3_r_
_ s
_1
S_

....
Plenum

_"
_:

A = 4 1/4" (108mm) Minimum
clearance from back of hole
to wall or other obstruction.

The sub-base for combustible floors is not required when a downflow furnace, used with a downflow coil box, is set on combustible flooring.
1.

2" (50.8mm)__'_

44101 202301

2" (50.8mm)

Cut the opening in the floor according to the dimensions in
Table 7 because the base is equipped with locating tabs
that center the base over the opening.
The opening in the base is 11/4" (31.8mm) shorter and 11/8"
(28.6mm) narrower than the minimum required size of the
opening in the floor. This is done to maintain a 1" (25.4mm)
clearance between the floor and the plenum.

1" (25.4mm)

Specifications are subject to change without notice

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Sett,n t.e ase

height of the subbase raises the downfiow coil off the floor to allow
easy installation of the condensate drain

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Furnace, /;- j \ z _..
Subbase

Condensate

Line Raised by Base

Insulation

'_,

_-_

;;

WoodScrew

WoodFloor

Plenum

--_\_-_-/z

25-20-52

25-20-46A

Non- Combustible Floor
Fabricate the plenum to the dimensions given in Table 7.
Note that the dimensions given are outside dimensions.

Set the base over the opening in the floor, centering the
opening in the base over the opening in the floor. Fasten
the base to the floor with screws or nails. See Figure 30
and Figure 31.

Exploded
Downflow

View of Base for
Cased Coil

Set the furnace over the opening in the floor. If necessary, grout
around the base to seal air leaks between the base and the floor.

Duct Connections
In the downfiow position, the return-air duct must be connected to
only the top of the furnace. Top return connections can be made
by removing the knockout panel in the furnace base. Return air
connection through the side(s) or back of the furnace is NOT allowed.

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Duct Design
Design and install the 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.

21/2"

(63.5mm)

11/2" (38.1mm)

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 wilt produce audible noise
which, could be objectionable when the furnace 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
for air flow information.

Support Manual (Blower Data)

Size ductwork to handle air flow for heating and air conditioning, if used.

Duct Installation Requirements
i J;;:

J iJJ J;

J i Ji;JJ

_:_i:iiiil

Setting

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

the Base

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Coil
Subbase
Insulation

.........

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.

"_'_J_

WoodScrew '

i "_..'_'_

_'_

Wood Floor

Plenum

25-20-46A

Consideration must be given to the height of the base to allow for
easy installation of the condensate drain. See Figure 32. This
subbase for combustible floors has been designed so that the

Install cooling coil on furnace discharge. Cool air
passing over heat exchanger could cause
condensate to form resulting in heat exchanger
failure.
•

When a furnace is used with a cooling unit, the furnace
shall be installed parallel with or on the upstream side of the
cooling unit to avoid condensation in the heating element.

Specifications are subject to change without notice

441 01 202301

•

With a parallel flow arrangement, the dampers or other
means used to control flow of air shall be adequate to prevent chilled air from entering the furnace. Chilled air going
through the furnace could cause condensation and shorten
furnace life. Dampers (purchased locally) can be either automatic or manual. Manually or automatically operated
dampers MUST be equipped with a means to prevent furnace and air conditioning operation, unless damper is in
the full heat or cool position.

•

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 ° air turn between fan and inlet grille to reduce
noise.

•

Ductwork installed in attic or exposed to outside temperatures requires a minimum of 2" (50.8mm) of insulation with
outdoor type vapor barrier.

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

•

Ductwork installed in an indoor unconditioned space requires a minimum of 1" (25.4mm) of insulation with indoor
type vapor barrier.

12. Checks and Adjustments
Startup
NOTE: Refer to startup procedures
Manual.

ELECTRICAL
HAZARD

SHOCK,

FIRE,

in the Users Information

FIRE OR EXPLOSION HAZARD
Failure to turn OFF gas at shut off before
connecting manometer could result in personal
injury, death and/or property damage.

Turn OFF gas at shut off before connecting
manometer.

EXPLOSION

With gas OFF, connect manometer to manifold pressure
tap on the outlet of gas control valve. See Figure 33. Use a
manometer with a 0 to 12 in wc (0 to 2989 Pa) range.

Turn gas ON. Operate the furnace on High Heat by using a
jumper wire on the R to Wl & W2 thermostat connections
on the furnace control board.

Remove manifold pressure adjustment screw cover on furnace gas control valve. Turn adjusting screw counterclockwise to decrease the manifold pressure and clockwise to
increase pressure. See Figure 33.

Failure to followthis warning could result in injury,
death, and/or property damage.
If any sparks, odors or unusual noises occur,
immediately shut OFF gas and power to furnace.
Check for wiring errors or obstruction to blower.

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

NOTE: Adjustment screw cover MUST be replaced on gas control
valve before reading manifold pressure and operating furnace.
4.

Set manifold pressure to value shown in Table 5 or Table 4.

Operate the furnace on Low Heat by using a jumper wire on
the R to Wl thermostat connections on the furnace control
board.

ManifoldGas Pressure Adjustments

Note: The SWl DIP switch #3 should be in the on position
to set the Low Heat manifold pressure. (See wiring diagram.)

(High and Low Heat)
NOTE: Make adjustment to manifold pressure with burners operating.

Typical

Gas Control

Valve

Honeywell

Repeat steps 3 and 4 for Low Heat operation.

When the manifold pressures are properly set, replace the
adjustment screw covers on the gas control valve.

Remove the jumper wires from the thermostat connections
on the furnace control board. Remove manometer connection from manifold pressure tap, and replace plug in gas
valve.

Return SWl DIP switch #3 to previous setting.

Regulator

10. Check for leaks at plug.

Natural Gas Input RatingCheck
The gas meter can be used to measure input to furnace. Check
with gas supplier for actual BTU content.

25-24-98a

44101 202301

OUTLET
Pressure
Tap

1/8"

Turn OFF gas supply to all appliances other than furnace
and start furnace. Use jumper wire on R to Wl and W2 for
High Heat.

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

Specifications are subject to change without notice

Repeat step 2 with jumper wire on R to Wl for Low Heat.
NOTE: If meter uses a 2 cubic foot dial, divide results (seconds) by two.
NOTE: SWl DIP switch #3 must be in ON position. (See
furnace wiring diagram). Return SWl DIP switch #3 to previous setting after check.
Refer to Example. The Example is based on a natural gas BTU
content of 1,000 BTU's per cubic foot.

Ignitor

Location

in(mm)

21/16(52.4)

Example
NaturalGas
BTUContent
per cu. foot
1,000

No.ofSeconds
PerHour

TimePerCubic
FootinSeconds

BTUPer
Hour

NOTE: Flame sensor has a different orientation in all 050 models.
3,600
48
1,000 x 3,600 + 48 = 75,000 BTUH

75,000

TemperatureRise Check

To Determine the appliance kW input rate from a .05m 3 test dial
that has been clocked at 80 seconds for one complete revolution.

Number of
seconds per
hour

Example
Number of
seconds per

(kW)

REDUCED FURNACE LIFE HAZARD
Size of test dial

complete

kW m3/h

(.05m 3)

rotation
80

3,600
3,600
2.25m3/h

.05

2.25

kWh/m3

= 23.28

23.28 X 3.412 = 79,431 BTU

4.
5.

Use ONLY the blower motor speed taps marked "Y" for
YES for setting

+ 80 x .05 = 7.2 m3/h

x 10.35

Failure to properly set the air temperature rise may
result in reduced furnace life.

Remove jumper wire from R to Wl and W2.
Relight all appliances and ensure all pilots are operating.

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
NOx inserts for use with Natural Gas units ONLY.
If Propane Gas is required, NOx inserts must be
removed.

Main Burner Flame Check
Allow the furnace to run approximately 10 minutes. Then inspect
the main burner flames. See Figure 34.
Check for the following (Figure 34):
• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yellow tips.
• Flames extending directly from burner into heat exchanger.
• 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.

air temperature

rise.

Blower Motor Speed Taps for *8MPT Model Sizes
Model
Heat
LO
M LO
M HI
Sizes
Stage
RED
BLUE
ORN
LO
N
Y
Y
050B12
HI
N
Y
Y

HI
BLK
Y
N

075F14

LO
HI

N
N

Y
Y

100F14

LO
HI

N
N

Y
N

Y
Y

100J20

LO
HI

Y
N

N
Y

125J20

LO
HI

N
N

Y
Y

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

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.

Operate furnace on High Heat for ten minutes with all the
registers and duct dampers open by using a jumper wire on
R to Wl and W2 thermostat connections on the furnace
control board.
Note: The SWl DIP switch #3 should be in the on position.
(See furnace wiring diagram)

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Take readings and compare with range specified on rating
plate.

If the air temperature rise is not in the correct range, the
blower speed must be changed. A higher blower speed will
lower the temperature rise. A lower blower speed will increase the temperature rise.

Repeat steps 2 thru 4 with the furnace operating on Low
Heat for 10 minutes by using a jumper wire on the R to Wl
thermostat connections on the furnace control board.

Remove the jumper wire after the adjustments are complete. Return SWl DIP switch #3 to previous setting.

r Face

For ignitor location see Figure 35.

_-10-78

Specifications are subject to change without notice

441 01 202301

Hard-Wired Continuous Fan

BlowerAdjustments (*SMPT)
Changing Blower Speed

ELECTRICAL

SHOCK HAZARD

Failure to follow this warning could result in
personal injury or death.
Turn OFF power to furnace before changing
speed taps.
NOTE: The speed taps that the manufacturer sets at the factory
for this furnace are based on a nominal 400 CFM per ton for cooling and the basic mid range on the temperature rise for heating.
Since the manufacturer
cannot predict the static pressure
that will be applied to the furnace, it is the responsibility
of
the installer dealer/contractor
to select the proper blower
motor speed leads for the application
when the furnace 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 furnace control board
as well as location of unused blower motor speed leads. Use
the chart (Table 8) to determine the blower motor speed settings.

A terminal is provided on the furnace control board located in the
circulating air blower compartment for operation of the continuous
fan option. This connection is intended for the tow 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, it wilt provide low speed blower operation whenever the
other three speeds ("HI HEAT or LO HEAT" or COOL) are not
energized.
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of operation.

Separate Speed Selections for Low Heat, High Heat,
Cool, and Continuous-Fan
Connect tow speed lead from circulating air motor to the "CONT"
terminal atthe furnace control board. The appropriate motor leads
should already be connected to the "HI HEAT and LO HEAT" and
"COOL" terminals.

Heating and Continuous-Fan Speed the Same
If it is necessary
to operate the Low Heat speed and
continuous-fan speed using the same blower speed, connect a
jumper between the "LO HEAT" and "CONT FAN" terminals on
the furnace control board.
Note: There should be only ONE motor lead going to the "LO
HEAT" and "CONT FAN" terminals.

BlowerAdjustments (*SMPV)
Changing Blower Speed

Wire

Color

Motor Speed

Black

High

Orange*

Med-High

Blue

Med-Low

Red

Low

* Med-High

ELECTRICAL

Failure to disconnect
power
personal injury or death.

speed may not be provided on all models.

Change the heat or coot blower motor speed by removing the
motor lead from the "HI HEAT or LO HEAT" or "COOL" terminal and replace it with the desired motor speed lead from the
"MI" or "M2" location. Connect the wire previously removed
from the "HI HEAT or LO HEAT" or "COOL" terminal to the
vacated "M1" or "M2" terminal.

If the same speed must be used for both heating and cooling,
remove the undesired motor speed lead from the "HI HEAT
or LO HEAT" or "COOL" terminal and connect that lead to
the open terminal at "M1" or "M2" location or tape off. Attach
a jumper between the "HI HEAT or LO 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 offthe terminal of the motor
speed lead removed from the "HI HEAT or LO HEAT" or
"COOL" terminal with electrical tape since an open terminal
will not be available at the "M1" or "M2" location.

Continuous- Fan using "G"
Energizing the "G" terminal on the furnace control board provides
continuous fan operation.
This is done by connecting the G
terminal of the thermostat to the G terminal on the furnace control
board. When the FAN switch is turned from auto to ON the fan will
operate continuously at"LO HEAT" speed. EAC will be energized
in this mode.
NOTE: In heating, the fan will turn off during furnace ignition and
warm up then restart at heating speed.
44101 202301

SHOCK HAZARD
could

result

Turn OFF power to furnace before changing blower
speed.
NOTE: The blower speeds that the manufacturer sets from the
factory for this product are based on a nominal 400 CFM per ton
cooling and the mid range on the temperature rise for heating.
Since the manufacturer cannot predict the static pressure
that will be applied to the furnace, it is the responsibility
of the
installing dealer/contractor
to select the proper speeds for
the application when the furnace is installed.
If it is necessary to change speeds, refer to steps below.
1. The 115 VAC power supply to the furnace must be turned
OFF before making adjustments to the motor.
NOTE: Allow at least 1 minute before restoring power to the
furnace after making Blower Control changes.
2,

The heating, cooling and continuous blower speeds can be
adjusted by changing the SW2 DIP switch settings that are
located on the Tap Select Interface Board (see Figure 36).
* Switches #1 and #2 adjust the continuous blower speeds.
Switches #3 and #4 adjust the heating speed.
Switches #5 and #6 adjust the cooling speed.
Switches #7 and #8 adjust the cooling speed on/off delay
profiles. See the "Technical Support Manual" for the switch
settings for the desired airflow rates for the installation.
The jumper J1 is used to slightly increase (+) or decrease
(-) or not change (NOM) the blower speed selected from
SW2. J1 effects BOTH cooling and heating airflow.
* Continuous blower selection DIP 10 and 11 will cause the
blower to run in high cooling speed for all low cooling (Y1)
calls. Continuous blower DIP settings of 00 and 01 will allow
low cooling (Y1) calls to operate normally.

Specifications are subject to change without notice

and DIP SW2 switch #2. EAC will be energized in this mode.

Continuous- Fan using "G"

NOTE: In heating, the fan will not turn off during furnace ignition
and warm up.

Energizing the "G" terminal on the furnace control board provides
continuous fan operation.
This is done by connecting the G
terminal of the thermostat to the G terminal on the furnace control
board. When the FAN switch is turned from auto to ON the fan wilt
operate continuously at airflow selected by DIP SW2 switch #1

Hard Wired Continuous Fan Operation
Not available for variable speed models.

Variable Speed (*8MPV) Tap Select Interface Board (TSIB)
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•

iiiiAC?i_:l
Jo E_=
BRN C

[_1

I ............

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[]

...............

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........
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___
ON

!r
OFF

HP MODE

Ir
=

SELECTION

HEAT PUMP EFFICIENCY OR
HP COMFORT SELECT ON

I
I
I

CONTINUOUS
CFM SELECT

II _E_T'"_s_
II C°°L"°
CF_
IICOO'"_O_'OFF
I
SELECT

SELECT

DELAY PROFILES

25 25 54

13. Furnace Maintenance
FIRE, EXPLOSION, OR CARBON MONOXIDE
POISONING HAZARD

ELECTRICAL
HAZARD

SHOCK,

FIRE

EXPLOSION

Failure to have the furnace inspected and
maintained could result in personal injury, death,
and/or property damage.

Failure to follow this warning could result in
personal injury, death, and/or property damage.

It is recommended that the furnace be inspected
and serviced on an annual basis (before the
heating season) by a qualified service agency.

• Before servicing, disconnect all electrical power
to furnace.
• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.

See "User's

Information

Manual".

Specifications are subject to change without notice

441 01 202301

14. Sequence of Operation & Diagnostics for *8MPT
The following is the normal operating sequence at factory default settings (SWl OFF/ON/OFF)

Cooling (Y) Request:
24VAC signals applied to Y/Y2 & G terminals of FCB (furnace control board).
• Cool motor speed is energized after 5 second Cool Fan On Delay time.
Y/Y2 & G signals removed from FCB
• Coot motor speed is de-energized after 90 second Coot Fan Off Delay time.
NOTE: DEHUM not available on the *8MPT models.

ContinuousCirculating Fan (G) Request:
24VAC signal applied to G terminal of FCB.
• Low-Heat motor speed is energized without delay.
G signal removed from FCB.
• Low-Heat motor speed is de-energized

after 5 second delay.

NOTE 1) Furnace de-energizes the fan during the heat exchanger warm-up period on a call for Heating that occurs during a G request
unless a blower motor lead is connected to the CONT FAN terminal on the FCB, in which case see NOTE 2)
NOTE 2) Heating or Cooling requests received during a Fan request cause the fan speed to change to the appropriate heat or cool speed
after the Fan On Delay time expires. The fan returns to continuous circulating speed after the selected Fan Off Delay time expires
following toss of the Heating or Cooling request.

ContinuousCirculating Fan Hard-Wired (Cont) Request:
Field selected low speed motor tap installed on "CONT FAN" terminal.
• Low speed is energized when power applied to furnace. Operates at this speed continuously while there are no other
blower demands from furnace control board. Fan demands from furnace control board for heat, coot or"G" will override hard-wired
speed tap.
NOTE 3) EAC is NOT active for hard-wired

mode but IS active for fan demands from furnace control board for heat, cool and "G".

Heating(Wl) Request(single stage thermostatoperation,SWl DIP switch#3 must be in OFF
position) (see furnacewiring diagram):
24VAC signal applied to Wl terminal of FCB.
• Inducer motor turns on at high speed.
• Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins a 17 second warm up.
• The gas valve is energized, the main burners light at Low Heat rate and flame is sensed.
•
•
•

The ignitor is de-energized, and the inducer drops to low speed after the main burners ignite.
The FCB will delay Low Heat blower operation for the 45-second Low Heat Fan On Delay time, timed from
the opening of the gas valve.
If the Wl request is still present after 12 minutes, timed from the opening of the gas valve, the inducer switches to high speed,
closing the high pressure switch, then the High Heat solenoid energizes, and the fan switches to High Heat speed.

W1 signal removed from FCB.
•
•
•
•

The
The
The
The

gas valve de-energizes and the main burners go out.
inducer runs at its present speed for a 15 second postpurge period.
fan runs at its present speed.
fan de-energizes after the selected Heat Fan Off Delay time expires, timed from the gas valve de-energizing.

NOTE 4) If a new Heating request arrives while the control is waiting in the Heat Fan Off Delay time, the FCB will wait for the selected Heat
Fan Off Delay then start a new heating cycle as long as the heat call remains.

HeatingRequest(Wl & W2) (two-stage thermostatoperation,SWl DIP switch #3 must be in ON
position) (see furnace wiring diagram):
24VAC signal applied to Wl terminal of FCB.
• Same response as single stage thermostat operation (fan uses Low Stage Heat On Delay) described above except the control
will not go to High Heat rate, and High Heat Fan speed unless a W2 signal is applied.
24VAC signal applied to Wl and W2 terminals of FCB.
• Same light-off routine as described for the signal stage thermostat operation except main burners light at High Heat rate, the
inducer remains on high speed after ignition, and the FCB will delay blower operation at the High Heat Fan speed for 30 second
On Delay time.
NOTE 5) The FCB responds without delay to the presence or loss of W2 (with W1 constant). W1 & W2 result in high inducer, High Heat
rate, and High Heat Fan speed. Wl only results in low inducer, Low Heat rate, and Low Heat Fan speed.
44101 202301

Specifications are subject to change without notice

Heating Request with Gas Shut Off:
24 VAC signal applied to Wl terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call
remains. Power reset will clear lockout.
•
•
•

Inducer motor turns on at high speed.
Following a 15 second prepurge delay, the ignitor begins warm up.
The ignitor glows red-hot for 22 seconds, then turns off. The FCB flashes error code 6.

•
•
•
•
•

The ignitor stays off for 17 seconds, then begins to
The ignitor glows red hot for 22 seconds then turns
The ignitor stays off for 17 seconds, then begins to
The ignitor glows red hot for 22 seconds then turns
The ignitor stays off for 17 seconds, then begins to
The ignitor glows red hot for 22 seconds then turns
error code 6, and begins flashing error code 6 + 1.
The inducer motor de-energizes after a 15 second

warm up again.
off. The FCB continues flashing error code 6.
warm up again.
off. The FCB continues flashing error code 6.
warm up again.
off. The FCB proceeds to soft lockout. Stops flashing
post purge.

FurnaceControl Board DiagnosticCodes (See Figure 37):
OFF
Heartbeat
ON SOLID

=
=
=

1
2
3
4
5
6
6
7

=
=
=
=
=
=
=
=

Flash
Flashes
Flashes
Flashes
Flashes
Flashes
+ 1 Flashes
Flashes

8 Flashes
9 Flashes
10 Flashes

=
=
=

24VAC or 115VAC is off, fuse is open
Normal operation or no previous Diagnostic Code
Soft Lockout - Furnace Control Error (1 hr delay)
If code repeats immediately following power reset then replace control
Not used
Pressure switch(es) closed when should be open
Low pressure switch open when should be closed
Limit or flame roll-out switch open (less than 2 minutes)
Flame sensed out of sequence
Failure to ignite or flame sense lost while running
Soft Lockout - Max of four trials for ignition reached (3hr delay)
Soft Lockout - Limit or flame roll-out switch open longer than 2 minutes (1 hr delay)
(roll-out switch requires manual reset)
Permanent Lockout - Gas valve relay contact stuck closed or miswired gas valve (power reset only)
High pressure switch open when should be closed
Line voltage polarity or improper transformer phasing on twinned applications

NOTE: The 6 +
codes.
1 designation

indicates a combination

of flash

i __:

Control

Board

* If status code recall is needed, briefly (2-3 seconds) remove then
reconnect one limit switch wire (main or rollout) to display last
stored status code. Do not remove power or blower door before
initiating status code recall or code wilt be lost. Code is
automatically cleared after 72 hours or upon power reset.
for switch se_tings

* Properflame sense microamps:
2.0 - 4.0 microamps nominal

_-_ t;(

-.\\-%_ _.

,,_ _%..._42J_

0.7 microamps D.C. minimum,
24VAC ..........

FUSE

, '

DEHUM

25-24-74

HUMIDIFIER - The 24VAC HUM is energized when the low pressure switch closes on a call for heat. The 115V HUM (called HUM on
Control) is energized when the inducer is energized.
ELECTRONIC AIR CLEANER - EAC is energized when there is a blower speed call. It is NOT energized when blower operates in
the hard-wired continuous fan mode.

Specifications are subject to change without notice

441 01 202301

15. WiringDiagram*8MPT(TwoStageHeatingwith PSCMotor)

COOL

OFF

DELAY:

HiGH
I

EAT

HEAT
EAC

5 SEC

DELAY:

SWl

HEAT

=1, SWl

OFF

DELAY

THERMOSTAT
SWI

TYPE
=3

]
]
I

DELAY
45
SEC.
HUM
1.0A
MAX

NED

CONTROL

SWl

SEC.

COMB

FURNACE

]

SEC

STAGE

ON
DELAY
LOW
STAGE
ON
+

NEAT 0FF-DELAY
THERMOSTAT TYPE

HEAT 0FF-DELAY
THERMOSTAT TYPE

coz_
H EAT 0FF-DELAY
THERMOSTAT TYPE

HEAT 0FFDELAY
THERMOSTAT TYPE

CAPACH

44101 202301

Specifications are subject to change without notice

16. Sequence of Operation & Diagnostics for *8MPV
The following is the normal operating sequence at factory default settings (SWl OFF/ON/OFF, SW2 all OFF)
NOTE:

SW1 DIP switches (G, Y/Y2, W1, W2 thermostat terminals) and DEHUM (1/4" male quick connect terminal) are located on the
FCB.
SW2 DIP switches and Y1 and O thermostat terminals are located on the TSlB.

LowCooling (Y1) Request:
24VAC signals applied to Y1 & G terminals of TSIB (Tap Select Interface Board) and FCB (Furnace Control Board), respectively.
• Low Cooling motor speed is energized after 5 second Coot Fan On Delay time.
Y1 & G signals removed from TSlB and FCB
• Low Cooling motor speed is de-energized after 90 second Coot Fan Off Delay time.
Cooling (Y1) and dehumidification (DEHUM) requests:
• 24 VAC signals applied to Y1, DEHUM & G terminals of TSlB and FCB.
•

Same operation as the cooling (Y1) request, except the cooling airflow is reduced 20% to compensate for high
humidity conditions during cooling operation. The low cooling airflow returns to the normal setting after the DEHUM signal is
removed.

High Cooling (Y1 & Y/Y2) or (Y/Y2) Request:
24VAC signals applied to Y1 & Y/Y2 & G or Y/Y2 & G terminals of FCB (Furnace Control Board).
• High Cooling motor speed is energized after 5 second Cool Fan On Delay time.
Y1 & Y/Y2 & G or Y/Y2 & G signals removed from TSIB and FCB
• High Cooling motor speed is de-energized after 90 second Coot Fan Off Delay time.
High Cooling (Y1 & Y/Y2 or Y/Y2) and dehumidification (DEHUM) requests:
• 24 VAC signals applied to Y1 & Y/Y2 or Y/Y2, DEHUM, & G terminals of and FCB.
•

Same operation as the high cooling (Y1 & Y/Y2 or Y/Y2) request, except the cooling airflow is reduced 20% to compensate for high
humidity conditions during cooling operation. The high cooling airflow returns to the normal setting after the DEHUM signal is
removed.

Low or high cooling and O terminal (Heat Pump mode):
• If the J2 jumper is in the AC/HP EFFICIENCY position, there will be no change in blower airflow regardless of the O terminal being
energized or de-energized.
• If the J2 jumper is in the HP COMFORT position, then there will be a 10% reduction in airflow when the O terminal is de-energized
(HP heating) and no airflow reduction when O is energized (HP cooling).
NOTE 1) The motor has been set up to recognize the O terminal as energized during cooling calls (reversing valve energized for cooling).

ContinuousCirculating Fan (G) Request:
24VAC signal applied to G terminal of FCB.
• Continuous fan speed is energized without delay.
G signal removed from FCB.
• Continuous fan speed is de-energized

after 5 second delay.

NOTE 2) Heat or Cooling requests received during a Fan request, cause the fan speed to change to the appropriate heat or coot speed
after the Fan On Delay time expires. The fan returns to continuous circulating speed after the selected Fan Off Delay time expires
following toss of the Heating or Cooling request.
NOTE 3) Hard-wire option not available for variable speed models.
NOTE 4) Continuous blower selection DIP 10 and 11 wilt cause the blower to run in high cooling speed for all low cooling (Y1) calls.
Continuous blower DIP settings of 00 and 01 will allow low cooling (Y1) calls to operate normally.

Heating(Wl) Request(single stage thermostatoperation,SWl DIP switch#3 on the FCB must
be in OFF position) (see furnacewiring diagram):
24VAC signal applied to Wl terminal of FCB.
• Inducer motor turns on at high speed.
•
•
•
•

Following a 15 second prepurge delay after the low pressure switch closes, the ignitor begins a 17 second warm up.
The gas valve is energized, the main burners light at Low Heat rate.
The ignitor is de-energized, and the inducer drops to low speed after the main burners ignite.
The FCB will delay Low Heat blower operation for the 45-second Low Heat Fan On Delay time timed from the opening of the gas
valve.

•

If the Wl request is still present after 12 minutes, timed from the opening of the gas valve, the inducer switches to high speed,
closing the high pressure switch, then the High Heat solenoid energizes, and the fan switches to High Heat speed.

Specifications are subject to change without notice

441 01 202301

Wl
•
•
•
•

signal removed from FCB.
The gas valve de-energizes and the main burners go out.
The inducer runs at its present speed for a 15 second postpurge period.
The fan runs at its present speed.
The blower de-energizes after the selected Heat Fan Off Delay time expires timed from the gas valve de-energizing.

NOTE 5) If a new Heating request arrives while the control is waiting for the Heat Fan Off Delay time to expire, the FCB will wait for the
selected Heat Fan Off Delay, and then start a new heating cycle.

Heating(Wl & W2) Request(two-stage thermostatoperation,SWl DIP switch #3 must be in ON
position) (see furnace wiring diagram):
24VAC signals applied to W1 terminal of FCB.
• Same response as single stage thermostat operation described above except the burners, inducer, and blower will not go to high
heat rate, and High Heat Fan speed unless a W2 signal is applied.
24VAC signal applied to W1 and W2 terminals of FCB.
• Same tight-off routine as described for the signal stage thermostat operation except burners light at High Heat rate, the inducer
remains on high speed after ignition, and the FCB will delay High Heat blower operation for the 30-second High Heat Fan
On Delay.
NOTE 6) The FCB responds without delay to the presence or loss of W2 (with W1 constant). W1 & W2 result in high inducer, High Heat
rate, and High Heat Fan speed. W1 only results in low speed inducer, Low Heat rate, and Low Heat Fan speed.

Heating Request with Gas Shut Off:
24 VAC signals applied to W1 terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call
remains. Power reset wilt clear lockout.
• Inducer motor turns on at high speed.
• Following a 15 second prepurge delay after the tow pressure switch closes, the ignitor begins warm up.
• The ignitor glows red-hot for 22 seconds, then turns off. The FCB flashes error code 6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
• The ignitor stays off for 17 seconds, then begins to warm up again.
• The ignitor glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout. Stops flashing
error code 6, and begins flashing error code 6 + 1.
• The inducer motor de-energizes 15 seconds after error code 6 + 1 starts flashing.

FurnaceControl Board DiagnosticCodes (See Figure 37):
OFF

= 24VAC or 115VAC is off, fuse is open

Heartbeat

= Normal operation or no previous Diagnostic Code

ON SOLID

= Soft Lockout - Furnace Control Error (1 hr delay)

1 Flash

If code repeats immediately following power reset then replace control
= Not used

2 Flashes
3 Flashes

= Pressure switch(es) closed when should be open
= Low pressure switch open when should be closed

4 Flashes

= Limit or flame roll-out switch open (less than 2 minutes)

5 Flashes
6 Flashes

= Flame sensed out of sequence
= Failure to ignite or flame sense lost while running

6 + 1 Flashes = Soft Lockout - Max of four trials for ignition reached (3 hr delay)
7 Flashes

= Soft Lockout - Limit or flame roll-out switch open longer than 2 minutes (1 hr delay)

8 Flashes

(roll-out switch requires manual reset)
= Permanent Lockout - Gas valve relay contact stuck closed or miswired gas valve (power reset only)

9 Flashes
= High pressure switch open when should be closed
10 Flashes
= Improper transformer phasing on twinned applications or improper line voltage polarity.
* If status code recall is needed, briefly (2-3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored
status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared
after 72 hours or upon power reset.
* Proper flame sense microamps: 0.7 microamps D.C. minimum, 2.0 - 4.0 microamps nominal
NOTE 7) Continuous blower selection DIP 10 and 11 wilt cause the blower to run in high cooling speed for all low cooling (Y1) calls.
Continuous blower DIP settings of 00 and 01 will allow low cooling (Y1) calls to operate normally.
HUMIDIFIER - The 24VAC HUM is energized when the low pressure switch closes on a call for heat. The 115V HUM (called HUM on
Control) is energized when the inducer is energized.
ELECTRONIC AIR CLEANER - EAC is energized when there is a blower speed call. It is NOT energized when blower operates in
the hard-wired continuous fan mode.
44101 202301

Specifications are subject to change without notice

17. WiringDiagram*8MPV(VariableSpeedBlowerMotor)

Specifications are subject to change without notice

441 01 202301

18. Thermostat Wiring Guide
1.

These diagrams are for reference. See thermostat
wiring instructions for specific terminal assignments,
connections or operation.

24V HUM terminal on furnace control is used to power
a humidifier (on call for heat and pressure switch
closed) if no HUM thermostat option is available.

Humidifier/humidistat
with the furnace.

Dehumidify feature (MPV models only) requires thermostat with DEHUM feature or a separate dehumidistat to get the dehumidification operation. Dehumidistat is optional and not included with the furnace.
Underlined terminal indicates intended use for multiple function terminals.

DEHUM provides a 20% reduction in airflow (when Y1
orY1 + Y2 is energized) when the furnace control DEHUM terminal is energized with 24V.

is optional and not included

TSIB terminals only available on MPV models.

Two-stage Air Conditioning or two-stage Heat Pump
capability only available with MPV models.

W2 furnace operation
rithm SWl DIP switch
runs in Low Heat for 12
Heat if heating call still

10. If no DEHUM thermostat option is available, a dehumidistat that has closed contacts on a call for dehumidify may be used
11.

is from furnace control algo#3 (TT) set to OFF. Furnace
minutes then switches to High
exists.

O provides a 10% reduction inairflow when Y1 or Y1 +
Y2 is energized and O is NOT energized. (J2 jumper
on TSIB must be in HP COMFORT position to get this
function. AC/HP EFFICIENCY position results in no
reduction of airflow for Y1 or Y1 + Y2 calls regardless
of O being energized or not.)

12. For Heat Pump/Furnace s/stems, refer to Fossil Fuel
Kit or Dual Fuel Thermostat Installation Instructions
for wiring.

HUM and DEHUM Terminal available from Thermostat.
Models and Dehumidify Wiring (*MPV Models only)
TSIB

NO CONNECTION

NOTE

Humidifier Wiring

(*MPT/MPV)

NO CONNECTION
TWO-STAGEorVS
FURNACE
CONTROL

SINGLE-STAGE
THERMOSTAT

NOTE

SINGLE-STAGE
AIR CONDITIONER

3, 9, 10
._

DEHUM

24VHUM
I
i
i
i
I
i
i
L

OPTIONAL
HUMIDIFIER

NOTE

441 01 2023 01

Specifications are subject to change without notice

No HUM and/or DEHUM Terminal available from thermostat.
Dehumidify wiring (*MPV models only)

Humidifier Wiring (*MPT/MPV models)

TSI B NOTE5

NO CONNECTION

TWO-STAGE
or VS
FURNACE
CONTROL

SINGLE-STAGE
THERMOSTAT
OPTIONAL
DEHUMIDISTAT
(*MPV

Models

SINGLE-STAGE

AIR CONDITIONER

Only)

............--_ .............4_ql_
q
Connect
1 to Y/Y2
1-stage AC/HP
applications

for

i
,
L._.

NOTE

DEHUM

-U

l_q

l_q..
.......

.[]

24V HUM

-.
i
i

OPTIONAL
'
t
'

HUMIDISTAT

OPTIONAL

HUMIDIFIER

1,
i
i

_
NOTE

,
i
t

.......

NOTE2

Single-Stage
Single-Stage

Thermostat with Two-Stage
Air Conditioner

or Variable Speed Furnace (*MPT/MPV Models) and
TSIB

NOTE

NO CONNECTION

NO CONNECTION
(HP may use O)

TWO-STAGE

or VS

FURNACE
CONTROL

SINGLE-STAGE
THERMOSTAT
OPTIONAL
DEHUMIDISTAT
(*MPV

Models

Only)

g
Connect
1-stage

1 to Y/Y2
AC/HP

SINGLE-STAGE
AIR CONDITIONER

r_q

Fq
r_q

.
for

,
L_.

NOTE

3
• -t]

DEHUM

applications

i ......
i
i
i
i
i
i
i
i

.._

24V HUM

OPTIONAL

i
i

OPTIONAL
HUMIDIFIER

'
i
i
i

HUMIDISTAT

NOTE

_
_

,
'
i
i

.......

NOTE 2

Specifications are subject to change without notice

441 01 202301

Two-Stage Thermostat with Two-Stage
and Single-Stage Air Conditioner

Furnace or Variable Speed Furnace (*MPT/MPV Models)

TWO-STAGE
THERMOSTAT

TSIB NOTES

]ii

SINGLE STAGE
AIR CONDITIONER
VS FURNACE
CONTROL

OPTIONAL
r
DEHUMIDISTAT
,
(*MPV Models Only) _
If no DEHUM from _

\
\
\

thermostat

available

',
i

Fq
i
i
i

Connect
1 to Y1 for2stage AC-HP
applications.
OR
Connect
1 to Y/Y2 for
1-stage AC- HP
applications

,
i

,
'i
,
_

NOTE 3, 9, 10
,,_

DEHUM

i
i

I"
,I

i
i
i
i
i
i
i

OPTIONAL
HUMIDIFIER

i
i

.......

NOTE 2

Two-Stage Thermostat
Conditioner

with Variable Speed Furnace (*MPV Models only) and Two-Stage
TWO-STAGE
THERMOSTAT

It- - - I
I
I
I
I
I
I
I
I

OPTIONAL
DEHUMIDISTAT
(*MPV Models Only)
If no DEHUM from
thermostat available

Air

TSIB notes

TWO-STAGE
AIR CONDITIONER
VS FURNACE
CONTROL

'_
i

!L
Connect

1 to Y1 for 2-

stage AC-HP
applications.
OR
Connect 1 to Y/Y2 for
1-stage AC- HP
applications

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
L .......

,,_

DEHUM

[_-.
24V HUM

OPTIONAL
HUMIDIFIER

'i
i
i

,
'
i
i

.......

NOTE 2

441 01 2023 01

Specifications are subject to change without notice

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File Type Extension             : pdf
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Page Layout                     : SinglePage
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Producer                        : Goby Monitor Application version 4, 0, 0, 13
Create Date                     : Fri Oct 09 04:15:17 2009
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Title                           : 
Subject                         :

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ICP C8MPT050B12B1 User Manual 90+ 2 STAGE & MULTI SPEED BLOWER GAS FURNACE Manuals And Guides L0909253

ICP Furnace/Heater, Gas Manual L0909253 ICP Furnace/Heater, Gas Owner's Manual, ICP Furnace/Heater, Gas installation guides

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