ICP 8MPT Series Quick start guide

80+ GAS FURNACE
Category I Furnace
*8MPT Two-Stage Heating
*8MPV Variable Speed, Two-Stage Heating & Supports
Two- Stage Cooling Units * 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.
International Comfort Products, LLC
Lewisburg, TN.37091
1.SafeInstallationRequirements.................. 4
2.Installation................................. 5
3.SideVenting................................ 8
4.Combustion&VentilationAir ................... 9
5.GasVentInstallation ......................... 12
6.HorizontalVenting ........................... 13
7.ChimneyAdapterVenting...................... 15
8.GasSupplyandPiping........................ 18
9.ElectricalWiring............................. 22
INSTALLER: Affix these instructions on or
adjacent to the furnace.
CONSUMER: Retain these instructions for
future reference.
Table of Contents
10. Ductwork and Filter (Upflow/Horizontal) ......... 25
11. DuctworkandFilter(Downflow) ............... 27
12. ChecksandAdjustments .................... 30
13. FurnaceMaintenance....................... 33
14. SequenceofOperation&Diagnostic(*8MPT) ..... 34
15. WiringDiagram(*8MPT) ..................... 36
16. SequenceofOperation&Diagnostic(*8MPV) ..... 37
17. WiringDiagram(*8MPV) ..................... 39
18. ThermostatWiringGuide .................... 40
ELECTRIC SHOCK HAZARD
Failure to follow this warning
could result in personal injury
and/or death.
Turn Off All Power Before
Servicing.
CARBON MONOXIDE POISONING AND FIRE
HAZARD.
Failure to follow this warning could result in
personal injury, death and/or property dam-
age.
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 Fire Protection Association, Quincy, MA 02269 and American Gas Association
Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSi on the referenced subject which is represented only by the standard in its
entirety.
Specificationsare subject to changewithout notice 44101202301 March2009

Date of Start-Up:.
Dealer Name:
Address:
START-UP CHECK SHEET
For PSC Models *8MPT
(This sheet is optional. Keep for future reference.)
Calculated Input (BTU) Rate: (See Checks and Adjust-
ments Section).
Heating Check
Measured Line Pressure During High Heat:
Measured Manifold Pressure: High Heat
City, State(Province), Zip or Postal Code:
Phone:
Owner Name:
Address:
City, State(Province), Zip or Postal Code:
Model Number:
Serial Number:
Setup Checks
Check the box when task is complete.
All Electrical Connections Tight? Lj
Manual Gas Shut-off Upstream of Furnace/Drip LegLU
Gas Valve turned ON? Lj
Type of Gas: Natural: Lj LP: Lj
Temperature of Supply Air:
Low Heat
High Heat
Low Heat
Temperature of Return Air:
Temperature Rise (Supply - Return): High Heat __
Low Heat
In Rise Range (see furnace rating plate)?
Static Pressure (Ducts) High Heat:
The Blower Speed Tap used for:
Optional Check:
Cooling Check
Temperature of Supply Air:
Temperature of Return Air:
Temperature Difference:
Static Pressure (Ducts) Cooling:
Supply
Return
High Heat
Low Heat
CO?
CO2?
Supply
Return
CoolingThe Blower Speed Tap used for:
Dealer Comments:
Filter Type and Size:
Shade in Heating Fan "Time OFF" Setting and Thermo-
stat Type setting:
SWl
44101202301 Specifications are subject to change withoutnotice 2

Date of Start-Up:.
Dealer Name:
Address:
City, State(Province), Zip or Postal Code:
Phone:
START-UP CHECK SHEET
For Variable Speed Models *8MPV
(This sheet is optional. Keep for future reference.)
Calculated Input (BTU) Rate: (See Checks and Adjust-
ments Section).
Heating Check
Measured Line Pressure During High Heat:
Measured Manifold Pressure: High Heat
Owner Name:
Address:
City, State(Province), Zip or Postal Code:
Model Number:
Serial Number:
Setup Checks
Check the box when task is complete.
All Electrical Connections Tight? Lj
Manual Gas Shut-off Upstream of Furnace/Drip Leg[--]
Gas Valve turned ON? Lj
Type of Gas: Natural: Lj LP: Lj
Temperature of Supply Air:
Low Heat
High Heat
Low Heat
Temperature of Return Air:
Temperature Rise (Supply - Return): High Heat __
Low Heat
In Rise Range (see furnace rating plate)?
Static Pressure (Ducts) High Heat: Supply
Optional Check:
Cooling Check
Temperature of Supply Air:
Temperature of Return Air:
Temperature Difference:
Static Pressure (Ducts) Cooling:
Return
CO?
CO2?
Supply
Return
Filter Type and Size:
Shade in Final Furnace Settings Below:
SW1 [_
123 w2looooooDo1 1 234 5 678
J2
I=a D D el J; _-_ AC/HPEfficiencyBLOWER ADJUST HP Comfort
liP mode
select
Dealer Comments:
3Specificationsare subject to changewithout notice 44101202301

1. Safe Installation Requirements
FIRE, EXPLOSION, AND
POISONING HAZARD
Improper adjustment,
CARBON MONOXIDE
alteration, service,
Seal around supply and return air ducts.
Install correct filter type and size.
Unit MUST be installed so electrical components are pro-
tected from direct contact with water.
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.
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.
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.
A, The U.S. Consumer Product Safety Commission encourages
installation of carbon monoxide alarms. There can be various
sources of carbon monoxide in a building or dwelling. The
sources could be gas-fired clothes dryers, gas cooking
stoves, water heaters, furnaces, gas-fired fireplaces, wood
fireplaces.
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 speci-
fied 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. Con-
nect this furnace to an approved vent system only, as spe-
cified in "Combustion and Ventilation Air, Horizontal
Venting and Chimney Adapter Venting" of these instruc-
tions.
Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
"Gas Supply and Piping, Final Gas Piping Check" ofthese
instructions.
B,
• Always install furnace to operate within the furnace's in-
tended temperature-rise range with a duct system which
has an external static pressure within the allowable range,
as specified in "Technical Support Manual" of these in-
structions. See furnace rating plate. C.
• When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space con-
taining the furnace, the return air shall also be handled by 1.
aduct(s) sealed to the furnace casing and terminating out-
side the space containing the furnace.
• A gas-fired furnace for installation in a residential garage 2.
must be installed as specified in "Installation" of these in-
structions.
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 car-
bon monoxide levels, you should have a commercially avail-
able 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 main-
tained in the building or dwelling concurrently with the gas-
fired furnace installation (see Note below). The alarm should
be installed as recommended by the alarm manufacturer's
installation instructions.
• This furnace is not to be used for temporary heating of
buildings or structures under construction. See "Installa-
tion", item 10.
•This furnace is NOT approved for installation in mo-
bile homes, trailers or recreation vehicles.
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 Underwrit-
ers 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.
Toensure 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 haz-
ards involved with gas and electricity.
Do not use this unit if any part has been under water. Im-
mediately call a qualified service technician to inspect the unit
and to replace any part of the control system and any gas
control which has been under water.
3. Never obstruct the vent grilles, or any ducts that provide
air to the unit. Air must be provided for proper combustion
and ventilation of flue gases.
44101202301 Specifications are subject to change without notice 4

FrozenWaterPipe Hazard Ifyour furnace remains off for an extended time, the pipes in your
home could freeze and burst, resulting in serious water damage.
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.
Your furnace is designed solely to provide asafe and comfortable
living environment. The furnace is NOT designed to ensure that
water pipes will not freeze. It is equipped with several safety de-
vices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.
Ifthe structure wilt be unattended during cold weather you should
take these precautions.
1, Turn off the water supply to the structure and drain the water
lines if possible and add an antifreeze for potable water to
drain traps and toilet tanks. Open faucets in appropriate
areas.
-or-
2. Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a service agency to call to
provide service, if required.
-or-
3. Install a reliable remote sensing device that wilt notify
somebody of freezing conditions within the home.
2. Installation
CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace or other
appliances could result in personal injury or death.
If this furnace is replacing a previously common-
vented 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.
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 exist-
ing location based upon the minimum clearance and furnace di-
mensions (Figure 1).
CARBON MONOXIDE POISONING HAZARD
5,
6.
7,
8.
9,
Do NOT install furnace directly on carpeting, tile or other com-
bustible material other than wood flooring.
Maintain clearance for fire safety and servicing. A front clear-
ance 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:
Burners and ignition sources installed at least 18" (457 mm)
above the floor.
Furnace must be located or physically protected from pos-
sible damage by a vehicle.
If the furnace is to be suspended from the floor joists in a
basement or a crawl space or the rafters in an attic, it is nec-
essary 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:
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,
3.
4.
This furnace is NOT to be used for temporary heat of build-
ings 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).
The furnace is permanently installed with all electrical
wiring, piping, venting and ducting installed according to
these installation instructions. A return air duct is pro-
vided, sealed to the furnace casing, and terminated out-
side the space containing the furnace. This prevents a
negative pressure condition as created bythe circulating
air blower, causing a flame rollout and/or drawing com-
bustion 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 en-
trainment 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 main-
tained 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.
5 Specifications are subject to change without notice 44101202301

The filters used to clean the circulating air during the °
construction process must be either changed or thor-
oughly cleaned prior to occupancy.
The furnace, ductwork and filters are cleaned as neces-
sary to remove drywall dust and construction debris from
all HVAC system components after construction is com-
)leted.
Dimensions and Clearances (*8MPT/*8MPV)
After construction is complete,verify proper furnace op-
erating conditions including ignition, gas input rate, air
temperature rise, and venting according to these instal-
lation instructions.
in(mm)
(48)
TOP
5 (127)
.......................................................i
LEFT SIDE
(124)i
_-_ 265/8 (676)--_
, BOTTOM
(25)
i _te,_
I,eate *
;iiii!!,i
r
i
.... / ......
!
24"(610)min,
........................A ..............._
-- B "ii
;J :t /
i......................................................._
i i J
i,/
J
'_- 231/8 (587) ,_, _- 41/16 (103)
c
ALL DIMENSIONS- IN(MM)
1in =25.4mm
DIMENSIONAL INFORMATION
Furnace I Cabinet Top Bottom I ReturnAir
Capacity 15A/2 1B4 6F 1c I o IOpening3/8126/8
I I
(152)
*8MPTN050B (76) (356) (1.4) 1(321) 1 H
*8MPTN075F14 191!8 171/2 73/4 21/8 143/4 [
(197)
*8MPT100F14 (486) (445) (54) 1(15) Id
*8MPTN100J20 223/4 211/4 91/2 115/16 183/4 j
*8MPTN125J20 (578) (540) (241) (49) (476)
*Denotes Brand
MINIMUM CLEARANCES TO
COMBUSTIBLE MATERIALS FOR ALL UNITS
REAR 0
FRONT (combustion air openings in 3" (76 mm)
furnace and in structure)
Required For Service
ALL SIDES Of SUPPLY PLENUM
SIDES
VENT
Single Wall Vent 6" (152 mm)
Type B-1 Double Wall Vent 1" (25 mm)
TOP OF FURNACE 1" (25 mm)
*30" (762ram)clearancerecommendedforfurnaceremoval,
*24" (610 ram)
1" (25 mm)
0
Horizontal)osition:Linecontactis permissibleonlybetweenlines
formedby intersectionsoftop andtwosidesoffurnacejacket,and
buildingjoists,studsorframing,
(9!o)_
37i
(851)
33 ]i
3
_o, 281/2 (724) ,_
133/4 (95) _-_ 181/_ 470 _
r_ _ i _ / 3/4 (19)
2 4 /
i ...............................................................................,
7 40
(!7a)_ 0o16)
1) i ...................
14 _ I? 1/4-.......................(57!
(749) 1
291/_ Plugged starting hole 131/4 i i i
(440) to cut sideduct opening. (337)
i 1'75/16 ....... i i ;
13/4 .... _
=47/a _ 215/8 (542) i " 17/8 (48)
(45) _ (124) 261/2 (673)
NOTE:Evaporator"A" coildrainpan dimensionsmayvary from furnace ductopening size.Always
consultevaporator specificationsfor ductsize requirements.
Furnaceis designedfor bottomreturnor sidereturn,
Returnairthroughback offurnace isNOT allowed.
Drawingisrepresentative,butsomemodelsmayvary
InstallationPositions
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 at-
tached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must be
attached to the bottom. The return air ductwork must never be at-
tached to the back of the furnace.
FurnaceInstallation
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, Hori-
zontal Left or Downflow position.
Upflow
No modifications are required for upflow installation. (See
Figure 2)
44101202301 Specifications are subject to change withoutnotice 6

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Horizontal
If you purchased a multi-position furnace, it can be installed hori-
zontally 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
_iii_ i_i Typical Horizontal Installation
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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, con-
sult 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 re-
move furnace.
Keep all insulating materials clear from Iouvered door. Insulating
materials may be combustible.
The horizontal furnaces may be installed directly on combustible
wood flooring or supports, however, it is recommended for further
fire protection 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 recommen-
dation only, not a requirement).
This furnace MUST NOT be installed directly on carpeting, tile or
other combustible material other than wood flooring or supports.
Downflow
FIRE HAZARD
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 clear-
ances 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 "Duct-
work and Filter" (Downflow Section). The outlet flange must be
bent flat for downflow installation.
When installing afour-position furnace in the downflow position,
the logo isto be repositioned so that it is right side-up as follows:
T8MPT and T8MPV Model Numbers
1. Find the door hardware kit that is stored in the furnace and
save it.
2. Carefully remove logo from the outside of burner compart-
ment door and save it.
3. Carefully remove two small plug buttons from outside of
blower compartment door and save them.
4. Remove two thumbscrews from blower compartment door.
Save the two thumbscrews.
5. Install two thumbscrews in holes at other end of blower
compartment door from where thumbscrews were re-
moved.
6. Install new strip of rubber gasket on inside of blower
compartment door on edge that does not already have a
gasket.
7. Install logo retainer pins into holes in blower compartment
door from which plug buttons were removed.
8. Install plug buttons into holes in burner compartment door
from which logo was removed.
9. Install blower compartment door on furnace with bevel
edge and logo at top.
10. Install burner compartment door on furnace with bevel
edge at bottom.
C8MPT, C8MPV, H8MPT, and H8MPV Model Numbers
1. Carefully remove logo from burner compartment door and
save it.
2. Turn the logo rightside-up, and install the logo retainer pins
into holes in burner compartment door
7Specifications are subject to change without notice 44101202301

3. New labels for rightside-up application on outside of blower
compartment door may be purchased in a kit from your dis-
tributor to cover upside-down labels.
T ,ca,oown.ow.nsta.a.,on
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Downflow Venting: The combustion venter MUST be rotated to
vent out the side for all downflow installations, (see Figure 4). Bot-
tom 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.
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. Ifthe furnace is installed in an orien-
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 sur-
faces as to not melt the hose, switch, or wires. To prevent possible
kinking of the pressure switch hose, trim the hose to remove ex-
cess length (see Figure 5). Ifadditional wire length is needed, cut
the wire tie.
Pressure Switch Tube Routing
PRESS SW ASSY (DUAL)
SCREW HEX HD (2)
i v !
2 STAGE/VARIABLESPEED
r
TUBTNG
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, hori-
zontal-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 ofthe 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.
RotatingtheVenterAssembly
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.)
2. Disconnect power leads to the venter motor and hose to pres-
sure switch. Remove four(4) screws which secure the venter
to the collector box. (See Figure 7.)
3. 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).
44101202301 Specifications are subject to change withoutnotice 8

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Vent Plate
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4. 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 to provide
combustion and ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-
ings for supplying combustion and ventilation air must comply with
the gas codes, or in the absence of local codes, the applicable na-
tional codes.
Combustion and ventilation air must be supplied in accordance
with one of the following:
1. Section 9.3, Air for Combustion and Ventilation, ofthe Nation-
al Fuel Gas Code, National Fuel Gas Code (NFGC), NFPA
54/ANSI Z223.1-2006 in the U.S.,
2, 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,
3. 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.
ContaminatedCombustionAir
Installations in certain areas or types of structures could cause ex-
cessive exposure to contaminated air having chemicals or halo-
gens that will result in safety and performance related problems
and may harm the furnace. These instances must use only out-
door air for combustion.
The following areas or types of structures may contain or have ex-
posure to the substances listed below. The installation must be
evaluated carefully as it may be necessary to provide outdoor air
for combustion.
• Commercial buildings.
• Buildings with indoor pools.
• Furnaces installed in laundry rooms.
• Furnaces installed in hobby or craft rooms.
• Furnaces installed near chemical storage areas.
• Permanent wave solutions for hair.
• Chlorinated waxes and cleaners.
• Chlorine based swimming pool chemicals.
• Water softening chemicals.
• De-icing salts or chemicals.
• Carbon tetrachloride.
• Halogen type refrigerants.
• Cleaning solvents (such as perchloroethylene).
• Printing inks, paint removers, varnishes, etc..
• Hydrochloric acid.
• Sulfuric Acid.
• Solvent cements and glues.
• Antistatic fabric softeners for clothes dryers.
• Masonry acid washing materials.
OutdoorCombustionAir Method
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.
9Specifications are subject to change without notice 44101202301

Requirements
1. Provide confined space with sufficient air for proper com-
bustion and ventilation of flue gases using horizontal or ver-
tical ducts or openings.
2. Figure 8 illustrates how to provide combustion and ventila-
tion air when two permanent openings, one inlet and one
outlet, are used.
Air Openings and Connecting Ducts
1. Total maximum input ratings for all gas appliances in the
space MUST be considered when determining free area of
openings.
2. Connect ducts or openings directly to the outdoors.
3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4" (6.4 mm) mesh.
4. The minimum dimension of air ducts MUST NOT be less
than 3" (76 mm).
5. When sizing grille, louver or screen, use the free area of a.
opening. If free area is NOT stamped or marked on grill or
louver, assume a 20% free area for wood and 60% for met-
al. 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). b. Size openings and ducts per Table 1.
Outdoor Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
ThisinstallationNOTapprovedinCanada
Minimum One Inletand One Outlet Air Supply is Required
May be in and Combination Shown
Inlet Air Opening Must be Within12"(300mm} of floor
Outlet Air Opening Must be Within12"(300mm} of ceiling
(1} 1 Square Inch per 4000BTUH
(2} 1 Square Inch per 2000 BTUH
Gas Vent _,.Gable Vent
/Ventilated AtticS.
T9pAbove Insulation_
I I _ ITM
I I] IsOffitVent
OutletAir (1)
Outlet
JL I Io sl II I Air(l)
_u ,cI LI _t"_" ,._et
3"I I I'_-°'1 _ _ Air (2)
Inlet
Air (1)
o°s
Outlet
_Air (2)
Air (2)
3,
c. Horizontal duct openings reguire 1 square inch of free
area per 2,000 BTUH (11cmZ/kW) of combined input for
all gas appliances in the space (see Table 1).
d. Vertical duct openings or openings directly communicat-
ing with the outdoors require 1 square inch of free area
per 4,000 BTUH (5.5 cm2/kW) for combined input of all
gas appliances in the space (see Table 1).
When one permanent outdoor opening is used, the opening
requires:
a.
b,
1 sq. in of free area per 3,000 BTUH (7 cm2/kW) for com-
bined input of all gas appliances in the space (see
Table 1) and
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.
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 out-
doors.
4, Combination of Indoor and Outdoor Air shall have:
a. Indoor openings that comply with the Indoor Combus-
tion Air Method below and
b. Outdoor openings located as required in the Outdoor
Combustion Air Method above and
c. Outdoor openings sized as follows.
1) Calculate the Ratio of all Indoor Space volume
divided by required volume for Indoor Combustion
Air Method.
2) Outdoor opening size reduction Factor is 1 minus
the Ratio in 1) above.
3) Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method
above multiplied by reduction Factor.
44101202301 Specifications are subject to change withoutnotice 10