ICP 9MPD Series User manual

904 N9MP1 &N9MP2
SingleStage *9MPD
SAFETY REQUIREMENTS
A
Recognize safety information. This is the safety-alert symbol/ ._\. When you see this symbol on the furnace and in instructions or manuals be alert
to the potential for personal injury.
Understand the signal words DANGER, WARNING, or CAUTION. These words are used with the safety-alert symbol. DANGER identifies the
most serious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could result in personal injury or
death. CAuT__N is used t_ identify unsafe _ractices that c_u_d resu_t in min_r _ers_na_ injury _r _r_duct and _r__erty damage.
Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should
install, repair, or service heating equipment.
Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached
to or shipped with the unit and other safety precautions that may apply.
Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) NFPA No.
54/ANSIZ223.1. InCanada, refer tothecurrent editionofthe NationalStandard Canada CAN/CGA-B149.1- and.2-M91 NaturalGasand Propane
InstallationCodes (NSCNGPIC). Wearsafetyglassesandworkgloves. Havefireextinguisher availableduringstart-upandadjustment procedures
and service calls.
These instructions cover minimum requirements and conform to existing national sta nda rds and safety codes. In some insta rices, these instructions
exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We requre
these instructions as a minimum for a safe installation.
FAN ASSISTED, DIRECT VENT GAS FURNACE
Manufactured by:
International Comfort Products Corporation (USA)
Lewisburg, TN 37097
Table of Contents
1.SafeInstallationRequirements................. 4
2.Installation................................ 5
3.Combustion&VentilationAir .................. 8
4.Vent&CombustionAirPiping ................ 11
5.GasSupply andPiping...................... 30
6.ElectricalWiring ........................... 33
7.DuctworkandFilter ........................ 34
8. ChecksandAdjustments.................... 38
9.FurnaceMaintenance ....................... 39
10.SequenceofOperation&Diagnostics.......... 40
11.ConcentricVentTermination................. 44
12.TechSupport andParts ..................... 49
FIRE OR EXPLOSION HAZARD
This furnace is not designed for use in mobile
homes, trailers or recreational vehicles.
Such use could result in death, bodily injury
and/or property damage.
PrintedinU.S.A. LPI 12/03/2002 440 01 1114 (00)

N9MP1 -Indoor combustion air (1 pipe only)
N9MP2 - Direct Vent ONLY (2 pipe only)
*9MPD - Dual Certified Venting (1 or 2 pipes)
*Denotes Brand
JellJill _1
* 9
Brand
Brand Identifier
8 = Non-Condensing, 80+% Gas Furnace
9=Condensing, 90+% Gas Furnace
Installation Configuration
UP =Upflow
DN =Downflow
UH = Upflow/Horizontal
HZ = Horizontal
DH = Downflow/Horizontal
MP =Multiposition, Upflow/Downflow/Horizontal
Major Design Feature
1=One (Single) Pipe
2 = Two Pipe
D = 1 or 2 Pipe
L = Low NOx
* Denotes Brand
MP D 075 F 12 A #
Engineering Rev.
Denotes minor changes
MarketingDigit
Denotes minor change
Cooling Airflow
08 =800 CFM
12 = 1200 CFM
14 = 1400 CFM
16 = 1600 CFM
20 = 2000 CFM
Cabinet Width
N = Single Stage
P=PVC Vent
T = Two Stage
V=Variable Speed
B=15.5" Wide
F=19.1" Wide
J=22.8" Wide
L=24.5" Wide
Input (NominalMBTUH)
440 01 1114 00 Printed in U.S.A.

START-UP CHECK SHEET
For 90+ Furnace
(Keep this page for future reference)
Dealer Name:
Address:
City, State(Province), Zip or Postal Code:
Business Card Here
Phone:
Owner Name:
Address:
City, State(Province), Zip or Postal Code:
Model Number:
Serial Number:
Type of Gas: Natural:
Which blower speed tap is used?
(Heating) (Cooling).
Temperature of Supply Air:
Temperature of Return Air:
LP:
(°F). or(°C)
(°F) or(°C)
Rise (Supply Temp.-Return Temp.): (°F) or(°C)__
Filter Type and Size:
Fan "Time ON" Setting:
Fan "Time OFF" Setting:
Manual Gas Shut-Off Upstream
of Furnace/Drip- Leg?
Condensate Drain Connected?
YES [_
YES [_
Condensate Drain Trapped? YES [_
NOE_
NO
NO
Transition Pressure switch hose relocated for U/D/H
Application? YES [_ NO [_
Blower Speed Checked? YES [_ NO [_
All Electrical Connections Tight? YES [_ NO [_
Gas Valve OK? YES [_ NO [_
Measured Line Pressure When Firing Unit:
Calculated Firing Rate:(See Checks andAdjustments Sec-
tion).
Temperature Rise (supply-return temperature):(°F)__
Measured Manifold Gas Pressure:
Static Pressure (Ducts): Supply Air Return
Date of Start-Up:
CO?
CO2 ?
Dealer Comments:
44001111400

1. Safe Installation Requirements
Installation or repairs made by unqualified persons can
result in hazards to you and others. Installation MUST
conform with local codes or, in the absence of local
codes, with codes of all governmental authorities
havingjurisdiction.
The information contained in this manual is intended
for use by a qualified service technician who is
experienced in such work, who is familiar with all
precautions and safety procedures required in such
work and is equipped with the proper tools and test
instruments.
Failure to carefully read and follow all instructions in
this manual can result in furnace malfunction, death,
personal injury and/or property damage.
NOTE: This furnace is design certified by the Canadian Stan-
dards Association (CSA) for installation in the United States and
Canada. Refer to the appropriate codes, along with Figure 1 or
Figure 2 and this manual, for proper installation.
• Use only the Type of gas approved for this furnace (see
Rating Plate on unit). Overfiring will result in failure of
heat exchanger and cause dangerous operation. (Fur-
naces can be converted to L.E gas with approved kit.)
• Install this furnace only in a location and position as speci-
fied in "lnstallation"pg 5 of these instructions.
• Provide adequate combustion and ventilation air to the
furnace as specified in "Combustion and Ventilation Air"
on pg 8 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"on pg 8 of these
instructions.
• Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
"Gas Supply and Piping"on pg 32 of these instructions.
• 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 rat-
ings, as specified in "Technical Support Specifications"
pgs 49 - 51 of these instructions.
• 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
duct(s) sealed to the furnace casing and terminating out-
side the space containing the furnace.
• A gas-fired furnace for installation in a residential garage
must be installed as specified in "Installation Require-
ments"pg 7 of these instructions.
• This furnace is not to be used for temporary heating of
buildings or structures under construction.
• This furnace is NOT approved for installation in mo-
bile homes, trailers or recreation vehicles.
• Seal around supply and return air ducts.
• Install correct filter type and size.
• Unit MUST be installed so electrical components are pro-
tected from direct contact with water.
NOTE: It is the personal responsibility and obligation of the end
user to contact a qualifted installer to ensure that the installation is
adequate and conforms to governing codes and ordinances.
Safety Rules
Your unit is built to provide many years of safe and dependable
service provided it is properly installed and maintained. However,
abuse and/or improper use can shorten the life of the unit and
create hazards for you, the owner.
A. The U.S. Consumer Product Safety Commission recom-
mends that users of gas-burning appliances install carbon
monoxide detectors. There can be various sources of car-
bon monoxide in a building or dwelling. The sources could
be gas-fired clothes dryers, gas cooking stoves, water
heaters, furnaces, gas-fired fireplaces, wood fireplaces,
and several other items. Carbon monoxide can cause seri-
ous bodily injury and/or death. Therefore, to help alert
people of potentially dangerous carbon monoxide levels,
you should have carbon monoxide detectors listed by a na-
tionally recognized agency (e.g. Underwriters Laborato-
ries or CSA International) installed and maintained in the
building or dwelling (see Note below).
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.
B. There can be numerous sources of fire or smoke in a build-
ing or dwelling. Fire or smoke can cause serious bodily inju-
ry, death, and/or property damage. Therefore, in order to
alert people of potentially dangerous fire or smoke, you
should have fire and smoke detectors listed by Underwrit-
ers Laboratories installed and maintained in the building or
dwelling (see Note below).
Note: The manufacturer of your furnace does not test any de-
tectors and makes no representations regarding any brand
or type of detector.
C. To ensure safe and efficient operation of your unit, you
should do the the following:
1. Thoroughly read this manual and labels on the unit.
This will help you understand how your unit operates and
the hazards involved with gas and electricity.
2. Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system and
any gas control which has been under water.
3. Never obstruct the vent grilles, or any ducts that pro-
vide air to the unit. Air must be provided for proper com-
bustion and ventilation of flue gases.
Frozen Water Pipe Hazard
FROZEN AND BURST WATER PIPE HAZARD
Furnace may shut down. 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.
Failure to do so may result in burst water pipes, serious
property damage and/or personal injury.
Your furnace is designed solely to provide a safe and comfortable
living environment. The furnace is NOT designed to ensure that
water pipes will not freeze. It is equipped with several safety de-
vices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.
E_ 44001 111400

Ifyourfurnaceremainsoffforanextendedtime,thepipesinyour
homecouldfreezeandburst,resultinginseriouswaterdamage.
Watermaycreateaconditioninwhichmoldcangrowinyour
home.Certaintypesofmoldhavebeenreportedtocauserespi-
ratoryproblemsorotherserioushealthrisks.Remedialactions,
includingimmediatelydryingallwetitems,shouldbetakenquick-
lytohelppreventthedevelopmentofmoldinyourhome.
Ifthe structure will be unattended during cold weather you should
take these precautions.
Turn off the water supply to the structure and drain the wa-
ter lines if possible and add an antifreeze for potable water
to drain traps and toilet tanks. Open faucets in appropriate
areas.
-or-
Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a service agency to call to
provide service, if required.
-or-
3. Install a reliable remote sensing device that will notify
somebody of freezing conditions within the home.
Winter Shutdown
If you go away during the winter months and do not leave the heat
on in your home, the plastic transition box and the condensate
trap on the furnace must be protected from freeze damage.(See
Figure 8 trough Figure 17)
1. Disconnect the 5/8" OD rubber hose from the vent drain fit-
ting that is located downstream of the combustion blower.
Insert a funnel into the hose and pour four(4) ounces of
sanitary type (RV) antifreeze into the condensate trap. Re-
connect the 5/8" OD rubber hose to the stub on the vent
drain fitting. Secure with the hose clamp.
2. Disconnect the 3/4" OD rubber hose from the condensate
trap. Insert a funnel into the hose and and pour four(4)
ounces of sanitary type (RV) antifreeze into the plastic
Transition box. Squeeze the hose together near the end
and quickly reconnect the 3/4" OD rubber hose to the stub
on the condensate trap. Secure with the hose clamp.
When you return home, your furnace will be ready to start, as it is
not necessary to drain the antifreeze from the furnace.
2. Installation
CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace or other appliances
can result in death, personal injury and/or property
damage.
This furnace can NOT be common vented or connected to
any type B, BW or L vent or vent connector, nor to any
portion of a factory-built or masonry chimney. If this
furnace is replacing a previously common-vented
furnace, it may be necessary to resize the existing vent
and chimneyto prevent oversizing problems for the other
remaining appliance(s). See Venting and Combustion Air
Check in Gas Vent Installation section. This furnace
MUST be vented to the outside.
Location and Clearances
4. RefertoFigure lorFigure 2fortypicalinstallationandba-
sic connecting parts required. Refer to Figure 4 for typical
horizontal direct vent installation and basic connecting
parts required. Supply and return air plenums and duct are
also required.
5. 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 3).
CAUTION
Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause
improper operation or damage to equipment. If furnace
environment has the potential of freezing, the drain trap and
drainline must be protected. The use of electric heat tape or
RV antifreeze is recommended for these installations. (See
"Condensate Trap Freeze Protection Section ")
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals. Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air.
Typical Upflow Installation
Aluminum or non-rusting shield recommended. (See
Vent Termination Shielding for dimensions).
8" Min. __lnletPipe
20' Max.
-_ _ (not used on
Insame _ Single Pipe
atmospheric <_> model)
zone
Couplingonendsol
exhaust pipe.Total
pipe&couplingout-
8"
Min.
Max.
ameatmospheric
zone
Increase minimum from 8" to 18" for cold climates (sustained temperatures
below 0 o F). 25-23-33
44001 111400 [_

9,
Typical Downflow Installation
See VentTermination
Shieldingin VentSection.
I_ "8" Min.
InletPipe _ [_ 20' Max.
(not usedon _ in same
Single Pipe-------_ k,_k atmospheric zone
model) _
VentPi_c ;MUSTbe
supl Horizonta
andVertically
Coupling on inside
and outside of wall
to restrain vent pipe
8" Min.
Min.
Max.
same zone
* Increase minimum from 8" to 18" for cold climates (sustained temperatures
below O°F), 25-23-33a
Installation Requirements
1. Install furnace level.
3,
4.
5.
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 Ventand
Combustion Air Piping section).
Maintain clearance for fire safety and servicing. A front
clearance of 30" is required for access to the burner, con-
trols and filter.
6. Use a raised base for upflow furnace if the floor is damp or
wet at times.
For downflow installations, non combustible subbase must
be used under the furnace unless installation is on a non
combustible floor surface. This requirement applies even
when a coil box or cabinet is used.
FIRE HAZARD
Failure to install unit on noncombustible subbase can
result in death, personal injury and/or property damage.
Place furnace on noncombustible subbase on down-
flow applications, unless installing on non-combus-
tible flooring.
8. For horizontal installations, line contact is permissible only
between lines formed by intersection of back and two sides
of furnace jacket, and building joists, studs or framing.
Residential garage installations require:
Burners and ignition sources installed at least 18" above
the floor.
Located or physically protected from possible damage by
a vehicle.
10. Local codes may require a drain pan under the entire fur-
nace and condensate trap when the furnace is installed in
attic application.
Installation Positions
This furnace can be installed in an upflow, horizontal (either left or
right) or downflow airflow position. DO NOT install this furnace on
its back. For the upflow position, the return air ductwork can be
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.
Furnace Installation Considerations
The installation of the furnace for a given application will dictate
the position of the furnace, the airflow, ductwork connections,
vent and combustion air piping. Consideration must be given to
the following:
Condensate Trap and Drain Lines
The supplied condensate trap must be attached to the furnace
side panel on either the left or right side. For horizontal installa-
tions, the drain trap is vertically attached to the side panel below
the furnace. A minimum clearance of 6" below the furnace is re-
quired for the condensate trap. Downward slope of the conden-
sate drain line from the condensate trap to the drain location must
be provided. Adequate freeze protection of the drain trap and the
drain line must be provided. See "Condensate Drain Trap"section
for further details.
Leveling
Proper leveling of the furnace must be provided to insure proper
drainage of the condensate from the furnace. The furnace must
be level to within 1/4" from front to back and from side to side for
upflow and downflow installations or top to bottom for horizontal
installations.
Vent and Combustion Air Connections
On the Dual Certified furnace, the vent and combustion air pipes
attach to the furnace through the top panel for the upflow and hori-
zontal installations. For the downflow installation, the vent and
combustion air pipes attach to the furnace through the alternate
locations on the furnace side panels.
Note: On the Direct Vent furnace, the vent pipe attaches to the fur-
nace through the side panels. The combustion air pipe attaches to
the top panel or to the alternate location on the side panel.
On the Single Pipe furnace, the vent pipe attaches to the furnace
through the furnace side panels.
Note: Repositioning of the combustion blower is required for the
vent pipe connection to the furnace through the "right side" panel.
See "Vent and Combustion Air Piping"section for further details.
44001 111400

t3!4
17/8
Dimensions & Clearances
TOP
F| ]jAI. I.TAKE
_/VENTrgMPD)
1
LEFT SIDE I_ _
I
TRAP (COUNTERFLOW) _ _
AiRI.TAKE ¢"
(ALTERNATE)_ J
TRAP 4131164 C
UPFLOWIHORIZONTAL
• THERMOSTAT/J_T-_ 7_
21518 47/8
24
/ELECTRICAL
-- 11/16
13/8 2! /8
213/4
624
I
1311/16
1/16
1913116
Cabinet to Combustible Clearances
TOP BOT. RH LH BACK FRONT FLUE
1' O' O' O' O' 3' O'
Horizontalposition:Linecontactispermissibleonly between lines
formedby intersectionsoftop andtwo sidesoffurnacejacket, and
buildingjoists,studsor framing,
--A--
-- B--
FRONT
C
Unit
Capacity
N9MP1050B12A
N9MP1075B12A
N9MP1080F16A
NgMP1100F14A
N9MP1100J20A
N9MP1125J20A
N9MP2050B12A
N9MP2075B12A
N9MP2080F16A
N9MP2100F14A
N9MP2100J20A
N9MP2125J20A
*9MPD050F12A
*9MPD075F12A
*9MPD080J16A
*9MPD100J14A
*9MPD100J20A
*9MPD125L20A
BOTTOM
23118
Cabinet Bottom GAS
24
i21/4
191/4
17/8
25=23-36b
44001 111400

Horizontal Furnace Installation
This furnace can be installed horizontally in an attic, basement,
crawl space, alcove, or suspended from a ceiling in a basement or
utility room. See Figure 4. Do not install furnace on its back or in
the reverse airflow positions as safety control operation will be ad-
versely affected.
_ _!'i [ Typical Horizontal Installation
Inlet Pipe (not used on Single Pipe model)
Vent
C_
Condensate
Trap
NOTE: 6"bottomclearancerequiredfor condensatetrap.
25-23-34
If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe
straps or an angle iron frame to rigidly attach the furnace to pre-
vent 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. (Take caution to allow door panels to be removed for
maintenance)
If the furnace is to be installed in a crawl space, consult local
codes. A suitable concrete pad or blocks are recommended for
crawl space installation on the ground.
NOTE: 6" bottom clearance required for condensate trap.
Thirty (30) inches between the front of the furnace and adjacent
construction or other appliances MUST be maintained for service
clearance.
Keep all insulating materials clear from Iouvered door. Insulating
materials may be combustible.
The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clear-
ances are met. See Figure 4.
This furnace MUST NOT be installed directly on carpeting or tile
or other combustible material other than wood flooring or sup-
ports.
For horizontal installation over a finished living space. A field fab-
ricated auxiliary drain pan with drain pipe is required to prevent
damage by overflow due to blocked condensate drain.
3. Combustion & Ventilation Air
For Single Pipe Installation
CARBON MONOXIDE POISONING HAZARD
2. Connect ducts or openings directly to outside.
3. When screens are used to cover openings, they MUST be
no less than 1/4" mesh.
Failure to provide adequate combustion and ventilation
air can result in death and/or personal injury.
Use methods described here to provide combustion and
ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-
ings for supplying combustion and ventilation air must comply
with National Fuel Gas Code, NFPA54/ANSI Z223.1, 2001 (or
current edition) and applicable provisions of local building codes.
This furnace can NOT be common vented or connected to any
type B, BW or L vent or vent connector, nor to any portion of a fac-
tory-built or masonry chimney. If this furnace is replacing a pre-
viously common-vented furnace, it may be necessary to resize
the existing vent and chimney to prevent oversizing problems for
the other remaining appliance(s). See "Venting and Combustion
Air Check"in this section, This furnace MUST be vented to the
outside.
Air OpeningsandConnectingDucts
1. Total input rating for all non direct vent gas appliances
MUST be considered when determining free area of open-
ings.
4. The minimum dimension of rectangular air ducts MUST
NOT be less than 3".
5. When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, as-
sume a 20% free area for wood and 60% for metal.
Confined Space Installation
NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH input rating for all gas appliances
installed in the area.
Requirements
Provide confined space with sufficient air for proper com-
bustion and ventilation of flue gases using horizontal or ver-
tical ducts or openings.
Figure 5 illustrate how to provide combustion and ventila-
tion air. A minimum of two permanent openings, one inlet
and one outlet, are required.
One opening MUST be within 12" of the floor and the se-
cond opening within 12" of the ceiling.
E_ 44001 111400

Outside Air (This is ONLY a guide. SubJect to codes of country havingjurisdiction.)
Gas Vent
ThisinstallationNOTapprovedin Canada GasVen_,
i,
_, let Air (1) ._1 Gable Vent ,_
G, re. _ I_ .i II II II II Outlet
_"_Ventilated Attic_ Outlet I II Air(2)
Outlet Air (1) Soffit Vent f/"_- .. •I I I I I I I I I
-- /TopAbovelnsulation "_ ,_lrtl) I _ .LL II II
................................II I= II II
1- I'Outle;Air '1' I1 ISoffit Vent In.let _ ........ I _: -_Inlet
F°I A ;/ -- ] r_ II I Minimum Onelnlet and One Outlet Air Supply is Required
/ I I I HI MaybeinanyCombinationShown
:_ Inlet ' d ,m_,, I I _* I I I I Inlet Air Opening Must be Within12" of floor
Ventilated Crawl S . _ I I_'%] _ .
Air(l) I_ II"°'1 E:_h_r _ilei2 )Outlet Air Opening Must be Withinl2" of ceiling
(1)1SquareInchper4000BTUH
(2)1SquareInchper2000BTUH
alternateInlet Air (1)
4. Size openings and ducts per Table 1. Unconfined Space Installation
Horizontal duct openings require I square inch of free area
per 2,000 BTUH of combined input for all gas appliances in
area (see Table 1).
Vertical duct openings or openings directly to outside re-
quire 1 square inch of free area per 4,000 BTUH for com-
bined input of all gas appliances in area (see Table 1).
ii_i!iiii_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!i_i_i_!
BTUH
Input HorizontalDuct
Rating (2,000BTUH)
50,000 25sq. in.
75,000 37.5sq. in.
1OO,OOO 50sq. in.
125,000 62.5sq.in.
150,000 75sq. in.
VerticalDuct or openings
to outside(4,000BTUH)
12.5sq. in.
18.75 sq. in.
25sq. in.
31.25 sq. in.
37.5sq. in.
Free Area
MinimumFreeArea Required for Each Opening
Round Duct
(4,000BTUH)
4"
5"
6"
7"
7"
EXAMPLE: Determining Free Area
Appliance 1 Appliance 2 Total Input
100,000 + 30,000 = (130,000 +4,000) = 32.5 Sq. In. Vertical
Appliance 1 Appliance 2 Total Input
100,000 + 30,000 = (130,000 +2,000) = 65 Sq. In. Horizontal
One permanent opening, commencing within 12" of the top of the
enclosure, shall be permitted where the equipment has clear-
ances of at least 1" from the sides and back and 6" from the front
of the appliance. The opening shall directly communicate with the
outdoors or shall communicate through a vertical or horizontal
duct to the outdoors or spaces (crawl or attic) that freely communi-
cate with the outdoors, and shall have a minimum free area of:
1 sq. in per 3000 Btu per hr. of the total input rating of all
equipment located in the enclosure, and
Not less than the sum of the areas of all vent connectors in
the confined space.
CARBON MONOXIDE POISONING HAZARD
Failure to supply additional air by means of ventilation
grilles or ducts could result in death and/or personal
injury.
An unconfined space or homes with tight construction
may not have adequate air infiltration for proper
combustion and ventilation of flue gases.
Most homes will require additional air.
An unconfined space is defined as an area having a minimum vol-
ume of 50 cubic feet per 1,000 Btuh total input rating for all gas
appliances in area. Refer to Table 2 for minimum area required.
IUnconfined Space
................................................................................................................IMinimum Area in Square Feet
BTUH Input Minimum Area in Square Feet
Rating
50,000 312
78,000 490
114,000 712
155,000 968
EXAMPLE: NOTE: Square feet is based on 8 foot ceilings.
28,000BTUH X 50CubicFt, = 1,400 = 175Sq, Ft.
1,000 8' Ceiling Height
NOTE: Refer to definitions in section titled Unusually Tight
Construction. If any oneofthe conditions apply, the space MUST
be considered confined space regardless of size.
1. Adjoining rooms can be considered part of an unconfined
area if there are openings without doors between rooms.
2. An attic or crawl space may be considered an unconfined
space provided there a re adequate ventilation openings di-
rectly 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 of free area per 4,000
BTUH of total input rating for all gas appliances in area.
44001 111400 [_

3. Installairintakeaminimumof12"abovemaximumsnow
levelandclearofanyobstruction.Ductorventilationopen-
ingrequiresonesquareinchoffreeareaper4,000BTUH
oftotal input rating for all gas appliances in area.
4. Air inlet MUST be screened with not less than 1/4" mesh
screen.
Unusually Tight Construction
In unconfined spaces, infiltration may 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 Con-
fined Space Installation:
Unusually tight construction is defined as: Construction with
1. Walls and ceilings exposed to the outside have a continu-
ous, sealed vapor barrier. Openings are gasketed or
sealed and
2,
3.
Doors and openable windows are weather stripped and
Other openings are caulked or sealed. These include joints
around window and door frames, between sole plates and
floors, between wall-ceiling joints, between wall panels, at
penetrations for plumbing, electrical and gas lines, etc.
Ventilation Air
Some provincial codes and local municipalities require ventilation
or make-up air be brought into the conditioned space as replace-
ment air. Whichever method is used, the mixed return air temper-
ature across the heat exchanger MUST not fall below 60 °F or flue
gases will condense in the heat exchanger. This will shorten the
life of the heat exchanger and possibly void your warranty.
Venting and Combustion Air Check
The following information is supplied to allow the installer to make
adjustments to the setup of existing appliances, IF REQUIRED,
based on good trade practices, local codes, and good judgement
of the installer. Manufacturer does NOT take responsibility for
modifications made to existing equipment.
NOTE: If this installation replaces an existing furnace from a
commonly vented system, the original venting system may no
longer be sized to properly vent the attached appliances. An im-
properly sized venting system may cause the formation of con-
densate in the vent and the leakage or spillage of vent gases. To
make sure there is adequate combustion air for all appliances,
MAKE THE FOLLOWING CHECK.
Vent Check
VentPipe --_1 [ A/ Draft Hood
Typical Gas
Water Heater,_ f[ [ _ _,_._. Match
I!
If flame pulls towards draft hood, this indicates suffi-
cient venting.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation, while all other appliances connected to
the venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223,1/NFPA 54 or CSA B149. 1, Natural Gas and Pro-
pane Installation Codes and these instructions. Deter-
mine that there is no blockage or restriction, leakage, cor-
rosion and other de to ensure there is no blockage or re-
striction, 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 will operate
at maximum speed. Do not operate a summer exhaust
fan.
6. Followthe lighting instructions. Place the appliance being
inspected into operation. Adjust thermostat so appliance
is operate continuously.
7. Test for spillage from draft hood equipped appliances at
the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle. (Figure 6)
8. If improper venting is observed, during any of the above
tests, the venting system must be corrected in accor-
dance with the National Fuel Gas Code, ANSI
Z223,1/NFPA 54 or CSA B149. 1, Natural Gas and Pro-
pane Installation Codes.
9. After it has been determined that each appliance con-
nected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas-fired burning ap-
pliance to their previous conditions of use.
For Two Pipe Installation
This furnace can NOT be common vented or connected to any
type B, BW or L vent or vent connector, nor to any portion of a fac-
tory-built or masonry chimney. If this furnace is replacing a pre-
viously common-vented furnace, it may be necessary to resize
the existing vent and chimney to prevent oversizing problems for
the other remaining appliance(s). See "Venting and Combustion
Air Check"in this section. This furnace MUST be vented to the
outside.
E_ 44001 111400