Amana GUI User manual

Effective: May 1996 (1) 10759815
As a professional installer you have an obligation to
know the product better than the customer. This
includes all safety precautions and related items.
Priortoactualinstallation,thoroughlyfamiliarizeyour-
self with this Instruction Manual. Pay special attention
to all safety warnings. Often during installation or
repairitispossibletoplaceyourselfinapositionwhich
is more hazardous than when the unit is in operation.
Remember, it is your responsibility to install the
productsafelyand toknowit wellenoughto beableto
instruct a customer in its safe use.
Safety is a matter of common sense...a matter of
thinking before acting. Most dealers have a list of
specific good safety practices...follow them.
TheprecautionslistedinthisInstallationManualshould
notsupersedeexistingpracticesbutshouldbeconsid-
ered as supplemental information.
Amana Refrigeration, Inc.
Fayetteville, TN 37334
ATTENTION INSTALLING PERSONNEL
Amana Forced Air Central Furnace Design Complies With Requirements
Embodied in The American National Standard / National Standard of Canada
Shown Below.
ANSI Z21.47•CAN/CGA-2.3 Central Furnaces
GUI* & GCI*
Gas Fired Warm Air
Furnace Installation Instructions
Affix this manual, Specification Sheet and Users
Information Manual adjacent to the furnace.
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION
Table of Contents
I. Safety and Unit Location ..............................................................3
II. General Information......................................................................4
III. Air Requirements .........................................................................4
IV. Category I Venting (Vertical Venting) ..........................................7
V. Masonry Chimneys .......................................................................9
VI. Gas Piping ...................................................................................13
VIl. Electrical Wiring .........................................................................17
VIlI. Circulating Air and Filters.........................................................20
IX. Sequence of Operation (Integrated Ignition Control) ..................23
X. Start-Up and Adjustment ..............................................................24
XI. Maintenance ................................................................................29

2
WARNING
Iftheinformationintheseinstructionsis
not followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
—Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
—What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
—Installation and service must be per-
formedby aqualified installer,service
agency or the gas supplier.
WARNING
Should overheating occur or the gas
supply fail to shut off, turn off the man-
ual gas control valve to the furnace be-
fore shutting off the electrical supply.
To The Owner
It is important that you fill out the owner’s registration
card and mail it today. This will assist Amana in con-
tacting you should any service or warranty information
changeinthefuture.Whenfillingintheregistrationcard,
be sure to include the Model, Manufacturing and Serial
Numbers, plus the installation date.
Your warranty certificate is also supplied with the unit.
Read the warranty carefully and note what is covered.
Keepthewarranty certificateina safeplace,so youcan
find it, if necessary.
If additional operating instructions are required, call the
dealer where the purchase was made.
ToThe Installer
Before installing this unit, please read this manual to
familiarize yourself on the specific items which must be
adhered to, such as maximum external static pressure
to unit, air temperature rise, minimum or maximum
CFM, motor speed connections, and venting. These
furnaces are designed for Category I venting only.
WARNING
To prevent possible death or personal
injury due to asphyxiation, Amana Non-
Condensing Gas Fired Warm Air Fur-
nacesmustbeCategory I vented.Donot
vent any of these furnaces using Cat-
egory III venting.
Keep this literature in a safe place for fu-
ture reference.

3
• Do not install the furnace where the combustion air
is exposed to the following substances: permanent
wavesolutions,chlorinatedwaxesorcleaners,chlo-
rine based swimming pool chemicals, water soften-
ing chemicals, deicing salts or chemicals, carbon
tetrachloride, halogen type refrigerants, cleaning
solutions(suchasperchloroethylene),printinginks,
paint removers, varnishes, hydrochloric acid, ce-
ments and glues, antistatic fabric softeners for
clothes dryers, and masonry acid washing materi-
als. Ifthefurnaceisinstallednearanareawhichwill
be frequently contaminated by these substances,
the furnace should be sealed from this area so that
little contaminated air can reach the furnace. The
furnace must still have an adequate supply of com-
bustion air, either from a nearby uncontaminated
room or from outdoors. For details, see “AIR RE-
QUIREMENTS” Section III.
• Provisions must be made for venting combustion
productsoutdoorsthroughaproperventingsystem.
The length of flue pipe could be a limiting factor in
locating the furnace.
• When installed horizontally, the furnace must be
installed with the access doors vertical so that the
burners fire horizontally into the heat exchanger.
The unit cannot be installed with the access doors
on top or bottom. (See Specification Sheet)
• Allow clearances from the enclosure as shown on
SpecificationSheetforfireprotection,properopera-
tion,andserviceaccess.Theseclearancesmustbe
permanently maintained. The combustion and ven-
tilatingairopeningsinthefrontandtoppanelsofthe
furnace must never be obstructed.
• This furnace shall not be connected to a chimney
flue serving a separate appliance designed to burn
solid fuel.
• When the furnace is used in connection with a
cooling unit, the furnace must be upstream of, or in
parallelwith,thecoolingunit.FordetailsseeSection
VIlI.
• On Counterflow Installations, the air conditioning
coil must be downstream from the heat exchanger
of the furnace.
• CounterflowInstallationoveranoncombustiblefloor.
Beforesettingthefurnaceovertheplenumopening,
insure the surface around the opening is smooth
and level. A tight seal should be made between the
furnace base and floor by using a silicone rubber
caulking compound or cement grout.
• Counterflow Installation over a combustible floor. If
installation over a combustible floor becomes nec-
essary,useanaccessorysub-baseasshownonthe
SpecificationSheet.Followtheinstructionswiththe
sub-base for proper installation. Do not install the
furnace directly on carpeting, tile, or other combus-
tible material other than wood flooring. (Note: The
sub-base will not be required if an air conditioning
coil is installed between the supply air opening on
the furnace and the floor.)
I. Safety and Unit Location
WARNING
To prevent personal injury or death due
to improper installation, adjustment, al-
teration, service, or, maintenance refer
to this manual or for additional assis-
tance or information consult a qualified
installer, service agency or the gas sup-
plier.
WARNING
This product contains or produces a
chemicalorchemicalswhichmaycause
serious illness or death and which are
knowntotheStateof California tocause
cancer, birth defects or other reproduc-
tive harm.
WARNING
To prevent possible death, personal in-
jury or equipment damage due to fire,
the following points must be observed
when installing the unit.
WARNING
To prevent possible death, personal in-
juryorpropertydamageduetoelectrical
shock, the furnace must be located to
protect the electrical components from
water.
NOTE: This unit must not be used as a “construction
heater” during the finishing phases of construction on a
new structure. This type of use may result in premature
failure of the unit due to extremely low return air tem-
peratures and exposure to corrosive or very dirty atmo-
spheres.
WARNING
To prevent possible death, personal in-
jury or property damage, do not install
this unit in a mobile home, trailer or
recreational vehicle.
Additional Safety Considerations
• This furnace is approved for Category I Venting
only.
• Whenthefurnace is heating,thetemperature ofthe
return air entering the furnace must be between
55°F and 100°F.

4
• The furnace must be level. If the furnace is to be set
onafloorthatmaybecomewetordampattimes,the
furnace should be supported above the floor on a
concretebasesizedapproximately1-1/2"largerthan
the base of the furnace.
Additional Location Considerations
• The furnace should be as centralized as is practical
with respect to the air distribution system.
• Donotinstallthefurnacedirectlyoncarpeting,tile,or
combustible material other than wood flooring.
• When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 3/8” angle as
shown on the Specification Sheet. The length of the
rod will depend on the application and clearance
necessary.
• When installed in a residential garage, the furnace
mustbepositionedsotheburnersandignitionsource
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by
vehicles.
II. General Information
WARNING
Possible death, personal injury or prop-
ertydamageduetofire,explosion,smoke,
soot, condensation, electrical shock or
carbon monoxide may result from im-
proper installation, repair, operation, or
maintenance on this product.
To ensure the furnace operates safely and efficiently, it
must be installed, operated and maintained in accor-
dance with these installation and operating instructions,
all local building codes and ordinances, or, in their
absence, with the latest edition of the National Fuel Gas
Code,ANSIZ223.1*,and/orCAN/CGAB149Installation
Codes.
The rated heating capacity of the furnace should be
greater than or equal to the total heat loss of the area to
beheated.Thetotalheatlossshouldbecalculatedbyan
approved method or in accordance with “A.S.H.R.A.E.
Guide”or“ManualJ-LoadCalculations”publishedbythe
Air Conditioning Contractors of America.
*Obtain from: American National Standards Institute
1430 Broadway New York, NY 10018
Transportation Damage
Check the furnace for any shipping damage. If damage
is found, contact the company where the furnace was
purchased.
While checking for transportation damage, remove all
packaging material and dispose or recycle according to
local codes.
Thermostat Location
Locate the thermostat about 5 feet high on a vibration-
free inside wall, in an area having good air circulation
Donotinstallthethermostatwhereitmaybeaffectedby:
• draftsordeadspotsbehinddoor,incornersorunder
cabinets.
• hot or cold air from ducts.
• radiant heat from sun or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas behind the thermostat,
such as an outside wall.
Consulttheinstructionspackagedwiththethermostatfor
mounting instructions.
III. Air Requirements
Combustion and Ventilation Air
WARNING
Possible death, personal injury or prop-
ertydamagemayoccurifthefurnaceand
otherfuel-burningappliancesarenotpro-
vided with enough fresh air for proper
combustionandventilationoffluegases.
Most homes require outside air to be
supplied into the furnace area.
Improved construction and additional insulation in build-
ings has reduced the heat loss, making these buildings
muchtighterarounddoors andwindowsso air infiltration
isminimal.Thiscreatesaproblemsupplyingcombustion
and ventilation air for gas fired and other fuel burning
appliances.Useofappliancespullingairoutofthehouse
(clothes dryers, exhaust fans, fireplaces, etc.) increases
this problem causing appliances to starve for air.
This furnace must use indoor air for combustion. It
cannot be installed as a direct vent (i.e., sealed com-
bustion) furnace. The burner box is present only to help
reduce sound transmission from the burners to the
occupied space.
Air Requirements
Most homes will require outside air supplied to the
furnace area by means of ventilation grilles or ducts
connectingdirectlytotheoutdoorsorspacesopen to the
outdoors such as attics or crawl spaces. The following
informationonairforcombustionandventilationisrepro-
duced from the National Fuel Gas Code NFPA54/ANSI
Z223.1 Section 5.3.

5
5.3.1 General:
(a) The provisions of 5.3 apply to gas utilization equip-
ment installed in buildings and which require air for
combustion, ventilation and dilution of flue gases from
within the building. They do not apply to (1) direct vent
equipment which is constructed and installed so that all
air combustion is obtained from the outside atmosphere
and all flue gases are discharged to the outside atmo-
sphere, or (2) enclosed furnaces which incorporate an
integral total enclosure and use only outside air for
combustion and dilution of flue gases.
(b)Equipment shallbe installedin a location in which the
facilities for ventilation permit satisfactory combustion of
gas, proper venting and the maintenance of ambient
temperature at safe limits under normal conditions of
use.Equipmentshallbelocatedsoasnottointerferewith
propercirculationofair.Whennormalinfiltrationdoesnot
providethenecessaryair,outsideairshallbeintroduced.
(c) In addition to air needed for combustion, process air
shallbeprovidedasrequiredfor:coolingofequipmentor
material,controllingdewpoint,heating,drying,oxidation
or dilution, safety exhaust, odor control, and air for
compressors.
(d) In addition to air needed for combustion, air shall be
supplied for ventilation, including all air required for
comfort and proper working conditions for personnel.
(e) While all forms of building construction cannot be
covered in detail, air for combustion, ventilation and
dilutionoffluegasesforgasutilizationequipmentvented
by natural draft normally may be obtained by application
of one of the methods covered in 5.3.3 and 5.3.4.
(f) Air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothes dryers, and fire-
places shall be considered in determining the adequacy
of a space to provide combustion air requirements.
5.3.2 Equipment Located in Unconfined Spaces: In
unconfined spaces (see definition below) in buildings,
infiltrationmaybeadequatetoprovideairforcombustion
ventilation and dilution of flue gases. However, in build-
ingsoftightconstruction(forexample,weatherstripping,
heavilyinsulated,caulked,vaporbarrier,etc.),additional
airmayneedtobeprovidedusingthemethodsdescribed
in 5.3.3-b or 5.3.4.
Space,Unconfined.ForpurposesofthisCode,aspace
whose volume is not less than 50 cubic feet per 1,000
BTU per hour of the aggregate input rating of all appli-
ances installed in that space. Rooms communicating
directly with the space in which the appliances are
installed through openings not furnished with doors, are
considered a part of the unconfined space.
5.3.3 Equipment Located in Confined Spaces: (a) All
Air from Inside the Building: The confined space shall be
provided with two permanent openings communicating
directlywithanadditionalroom(s)ofsufficient volumeso
thatthecombinedvolumeofallspacesmeetsthecriteria
for an unconfined space. The total input of all gas
utilization equipment installed in the combined space
shall be considered in making this determination. Each
openingshallhave a minimumfreearea of1square inch
per 1,000 BTU per hour of the total input rating of all gas
utilization equipment in the confined space, but not less
than 100 square inches. One opening shall be within 12
inches of the top and one within 12 inches of the bottom
of the enclosure. (Figure 1 )
Figure 1
Equipment Located in Confined Spaces;
All Air from Inside Building. See 5.3.3-a
.
(b) All Air from Outdoors: The confined space shall be
provided with two permanent openings, one commenc-
ing within 12 inches of the top and one commencing
within 12 inches of the bottom of the enclosure. The
openings shall communicate directly, or by ducts, with
theoutdoorsorspaces(crawlorattic)thatfreelycommu-
nicate with the outdoors.
1. When directly communicating with the outdoors,
each opening shall have a minimum free area of 1
square inch per 4,000 BTU per hour of total input
rating of all equipment in the enclosure. (Figure 2)

6
Figure 2
Equipment Located in Confined Spaces;
All Air from Outdoors—Inlet Air from
Ventilated Crawl Space and Outlet Air to
Ventilated Attic. See 5.3.3-b
2. When communicating with the outdoors through
vertical ducts, each opening shall have a minimum
free areaof 1 square inch per 4,000 BTU per hour of
total input rating of all equipment in the enclosure.
(See Figure 3)
Figure 3
Equipment Located in Confined Spaces;
All Air from Outdoors Through Ventilated
Attic. See 5.3.3-b.
3. When communicating with the outdoors through
horizontalducts,eachopeningshallhaveaminimum
free area of 1 square inch per 2,000 BTU per hour of
total input rating of all equipment in the enclosure.
(Figure 4)
*If the appliance room is located against an outside wall and the air openings communicate
directly with the outdoors, each opening shall have a free area of not less than one square
inch per 4,000 BTU per hour of the total input rating of all appliances in the enclosure.
Figure 4
Equipment Located in Confined Spaces;
All Air from Outdoors. See 5.3.3-b.
4. When ducts are used, they shall be of the same
cross-sectionalareaasthefreeareaoftheopenings
to which they connect. The minimum dimension of
rectangular air ducts shall not be less than 3 inches.
5.3.4 Specially Engineered Installations:
The requirements of 5.3.3 shall not necessarily govern
when special engineering, approved by the authority
havingjurisdiction,providesanadequatesupplyofairfor
combustion, ventilation, and dilution of flue gases.
5.3.5 Louvers and Grilles:
In calculating free area in 5.3.3, consideration shall be
given to the blocking effect of louvers, grilles or screens
protecting openings. Screens used shall not be smaller
than1/4inchmesh.Ifthearea throughadesignoflouver
orgrilleisknown,itshouldbeusedincalculatingthesize
of opening required to provide the free area specified. If
thedesignandfreeareaisnotknown,itmaybeassumed
that wood louvers will have 20-25 percent free area and
metal louvers and grilles will have 60-75 percent free
area. Louvers and grilles shall be fixed in the open
positionorinterlockedwiththeequipmentsothattheyare
opened automatically during equipment operation.
5.3.6 Special Conditions Created by Mechanical Ex-
hausting or Fireplaces:
Operation of exhaust fans, ventilation systems, clothes
dryers, or fireplaces may create conditions requiring
special attention to avoid unsatisfactory operation of
installed gas utilization equipment.

7
IV. Category IVenting (Vertical
Venting)
WARNING
To prevent possible death or personal
injury due to asphyxiation, Amana Non-
Condensing Gas Fired Warm Air Fur-
naces must be Category I vented. Do not
vent any of these furnaces using Cat-
egory III venting.
Category I Venting (vent at a non-positive pressure)
doesnothavetobegas-tight. WhenventedasCategory
I, this furnace is considered a fan-assisted appliance,
which has an induced draft blower to draw products of
combustion through the heat exchanger, and under
some conditions may be vented in common with natural
draft appliance (such as most water heaters).
All installations must be vented in accordance with Na-
tional Fuel Gas Code, NFPA 54 / ANSI Z223.1 - latest
edition. In Canada, the furnaces must be vented in
accordancewiththeNationalStandardofCanada, CAN/
CGA B149.1 and .2 - latest editions and amendments.
For any Category I installation, the vertical height of the
venting system will be at least as great as the horizontal
length of the venting system.
WARNING
To prevent possible death or personal
injuryduetoasphyxiation,commonvent-
ing with other manufacturer’s induced
draft appliances is not allowed.
Common venting with specific Amana Category I 80%
furnacesisallowedwiththeadditionofacommonventkit
(CVK) for each appliance. Contact the local installing
dealer, distributor or Amana directly for more informa-
tion.
For Category I venting, the minimum vent diameter is as
shown below:
MINIMUM VENT DIAMETER
MODEL GUI* GCI*
45 3 Inch 4 Inch
70 4 Inch 4 Inch
90 4 Inch 4 Inch
115 5 Inch 5 Inch
140 5 Inch 5 Inch
Under some conditions, larger vents than those shown
above may be required or allowed.
When an existing furnace is removed from a venting
system serving other appliances , the venting system
maybetoo largetoproperly venttheremaining attached
appliances.
Thefollowingstepsshallbefollowedwitheachappliance
remaining connected to the common venting system
placedinoperation,whiletheotherappliancesremaining
connected to the common venting system are not in
operation.
(a) Seal any unused openings in the common venting
system.
(b) Visually inspect the venting system for proper size
and horizontal pitch as required in the National Fuel
Gas Code, ANSI Z223.1, or the CAN/CGA B149
InstallationCodesandtheseinstructions.Determine
thereisnoblockageorrestriction,leakage,corrosion
or other deficiencies which could cause an unsafe
condition.
(c) Where practical, close all building doors, windows,
and all doors between the space where the appli-
ances remain connected to the common venting
systemare located and otherspaces of the building.
Turn on all gas appliances not connected to the
common venting system and operate on high speed
allexhaustfans(rangehoodsandbathroom),except
summer exhaust fans. Close fireplace dampers.
(d) Following the lighting instructions, place the furnace
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening after
5minutesofmainburneroperation.Usethe flame of
a match or candle, or smoke from a cigarette, cigar,
or pipe.
(f) After it has been determined that each appliance
remainingconnectedtothecommonventingsystem
properlyventswhentestedasoutlinedabove,return
doors, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance to their previ-
ous conditions of use.
(g) If improper venting is observed during any of the
above tests, the common venting system must be
corrected in accordance with the latest edition of the
National Fuel Gas Code, ANSI Z223.1.
When resizing any portion of the common venting sys-
tem,usetheappropriatetableinAppendixGinthelatest
edition of the National Fuel Gas Code, ANSI Z223.1.
Upflow or Horizontal units: As shipped, the induced
draftblower dischargesout thetop of the furnace. (“Top”
is as viewed for an upflow installation.) If desired, the
induceddraftblowermayberotated90degreescounter-
clockwiseforCategoryIventing,withtheairflowhorizon-
tal left to right. (Figure 5)
Figure 5
Upflow Rotated Induced Draft Blower

8
Counterflowunits: Asshipped,theinduceddraftblower
dischargesoutthetopofthefurnace.(“Top”isasviewed
for an counterflow installation.) If desired, the induced
draft blower may be rotated 90 degrees counterclock-
wise for Category I venting, with the airflow horizontal
right to left. (Figure 6)
Supply
Air Return
Air
Vent
Figure 6
Counterflow Rotated Induced Draft Blower
To rotate the induced draft blower counterclockwise
proceed as follows:
1. Disconnect electrical power from furnace.
WARNING
To prevent death or personal injury due
to electrical shock, disconnect electrical
power.
2. Remove the round cutout from the side of the
furnace.
Note: The assembly, starting from the outside, is
induced draft blower, outer gasket, rotation plate,
inner gasket, partition panel. See Figure 7.
Figure 7
3. Remove and save the four screws which hold the
rotation plate on the partition panel. Note that one of
thescrewswhichholdtheinduceddraftbloweronthe
rotation plate needs to be removed.
4.Turntherotationplate90degreescounterclockwise.
The inner gasket must turn with the rotation plate.
5. Reinstall the rotation plate on the partition panel,
using the four screws removed in step 3. Be certain
thatallscrewsaretightenedproperlysoastoprovide
an airtight seal.
6. Make sure all wires are at least one inch from flue
pipe. Relocate junction box to right side of cabinet if
necessary. Refer to Section Vl for instructions.
WARNING
To prevent death or serious illness to
building occupants due to flue products
leaking into the building, proper installa-
tion of gaskets and screws is essential
forprovidingagastightsealbetweenthe
partition panel and the induced draft
blower.

9
V.Masonry Chimneys
WARNING
Possibilityof propertydamage, personal
injury, or death - Damaging condensa-
tion can occur inside masonry chimneys
when a single fan assisted Category I
appliance (80% AFUE furnace) is vented
withoutadequatedilutionair.Donotcon-
nect an 80% furnace to a masonry chim-
neyunlessthefurnaceiscommonvented
with a draft hood equipped appliance, or
the chimney is lined with a metal liner or
Type B metal vent. All installations using
Masonry chimneys must be sized in ac-
cordance with the appropriate Venting
Tables.
Ifan 80% furnaceis common ventedwith
a draft hood equipped appliance, the
potential for condensation damage may
stillexistwithextremely cold conditions,
longventconnectors,exteriorchimneys,
or any combination of these conditions.
The risk of condensation damage is best
avoided by using the masonry chimney
as a pathway for properly sized metal
liner or Type B metal vent.
Wash
Crown
Clay Tile Size: 8" x 8" x12"
(Each x 24" Length)
Clay Tile Size Generally
12" x 12" (24" Length)
1/2" to 1" Air Space
Second Floor
First Floor
Attic Floor
Roof Line
Throat
Damper
Breech
Clean Out FanAssisted
Forced Air
Furnace
Natural Draft
Water Heater
Water Heater
VentConnector
Basement Floor
F.A.F. Vent
Connector
Figure 8
Typical Multiple Flue Clay Tile Chimney
Checklist Summary
This checklist serves as a summary of the items to be
checkedbeforeventing anAirCommand 80furnaceinto
a masonry chimney. In addition, we recommend that a
qualified serviceman use this checklist to perform a
yearly inspection of the furnace venting system.
This checklist is only a summary. For detailed informa-
tion on each of the procedures mentioned, see the
paragraph referenced with each item.
This inspection is based upon a draft topical report,
“Masonry Chimney Inspection and Relining”, issued by
the Gas Research Institute. While not yet finalized, we
believethisreportrepresentsthebestinformationonthis
subject which is currently available.
Yes
Proper Chimney
Termination?
(Check 1)
Line, terminate with
listed vent cap
(Fix 1)
Chimney channel
free of solid and
liquid fuel
appliances?
(Check 2)
Change venting
arrangements
(Fix 2)
Crown in good
condition?
(Check 3)
Rebuild crown
(Fix 3)
and /or Reline
(Fix 4)
Cleanout free of
debris?
(Check 4)
Reline
(Fix 4)
Liner in good
condition?
(Check 5)
Dilution air
available?
(Check 6)
Complete the
installation.
(Check 7)
Reline
(Fix 4)
Reline
(Fix 4)
No
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes

10
Check 1 - Proper chimney termination.
A masonry chimney used as a vent for gas fired equip-
ment must extend at least three feet above the highest
point where it passes through the roof. It must extend at
least two feet higher than any portion of a building within
a horizontal distance of 10 feet. In addition, the chimney
must terminate at least 3 feet above any forced air inlet
located within 10 feet. The chimney must extend at least
five feet above the highest connected equipment draft
hood outlet or flue collar.
If the chimney does not meet these termination require-
ments, but all other requirements in the checklist can be
met, it may be possible for a mason to extend the
chimney. If this will not be practical, see Fix 1, page 12.
2' Min. 2' Min. 3' Min.
10' or Less
Wall or
Parapet
Chimney
Ridge 2' Min.
10' or Less
3' Min.
Chimney
Figure 9
Termination 10 Feet Or Less From Ridge,
Wall or Parapet
Wall or
Parapet Chimney
NOTE: No Height
above parapet
required when distance
from walls or parapet is
more than 10 feet.
More than 10'
3' Min.
Ridge
3' Min.
Chimney
2' Min.
More than 10'
10"
Height above any
roof surface within
10 feet horizontally.
Figure 10
Termination More Than 10 Feet From
Ridge, Wall or Parapet
Check 2 - Any solid or liquid fuel appliances
vented into this chimney channel
Solid fuel appliances include fireplaces, wood stoves,
coal furnaces, and incinerators.
Liquid fuel appliances include oil furnaces, oil-fired boil-
ers and oil-fired water heaters.
Appliances which burn propane (sometimes referred to
asLP(liquefiedpetroleum))gasareconsideredgas-fired
appliances.
Check 3 - Chimney Crown Condition.
Damage from condensate usually shows up first in the
crown. If any of the following trouble signs are present,
the condition of the crown is not satisfactory:
a)Crown leaning
b)Bricks missing
c) Mortar missing
d)Tile liner cracked
e)No tile liner
f) Salt staining at mortar pints. (White stains, and
mortar becomes sandy and/or erodes.)
For problems a, b, or c, see Fix 3. If problems d, e, or f
are present; see Fix 4. IMPORTANT: It may be neces-
sary to follow both Fix 3 and Fix 4.

11
Check 4 - Debris in Cleanout
Acleanout(dropleg)mustbepresentsuchthattheupper
edgeofthecleanoutcoverisatleast12inchesbelowthe
lower edge of the lowest chimney inlet opening.
A chimney without a cleanout could become partially
blocked by debris. If no cleanout is present, the chimney
must be relined. (Fix 4)
Remove the cleanout cover, and examine the cleanout
for debris. If significant amounts of any of the following
are found:
•Fuel oil residue
•Bricks
•Mortar or sand
•Pieces of the tile liner
•Rusted pieces of the metallic liner
…then the chimney must be relined. (Fix 4)
Check 5 - Liner condition.
If a metal liner is present, it must be checked. It cannot
be assumed that all existing metal liners are correctly
installed and in good condition.
Removethelowestexistingventconnector,andexamine
the inside of the elbow or tee at the base of the liner. A
small amount of soot may be considered acceptable,
providedtheinstallervacuumsitaway.Ifrustedpiecesof
the liner have collected here, the metal liner must be
removed and replaced. (Fix 4)
Next, gently tap the inside of the liner with a phillips
screwdriver. If the screwdriver perforates the liner, or if
the tapping does not sound like metal hitting metal, the
liner must be removed and replaced. (Fix 4)
Remember that all appliances must be vented inside the
liner. Venting one appliance inside the liner and another
appliance outside the liner is not acceptable.
Next,useaflashlightandsmallmirrortosightuptheliner.
B vent must be supported so as to not come into direct
contactwiththechimneywallsortileliner.Ifitisnot,itcan
probably be rehung so as to be acceptable. A thimble or
fire stop may be helpful here.
Flexible liners should be hung straight or nearly straight.
If it is spiraled in the chimney and in good condition, it
should be rehung. To do this, break the top seal; pull up
and cut off the excess liner length, and refit the top seal.
Use caution when doing this, as the cut edges of flexible
liners may be sharp.
The surfaces of the liner must be physically sound. If
gaps or holes are present, the metal liner must be
removed and replaced. (Fix 4)
Finally, confirm that the metallic liner is the correct size
for the appliances to be installed. Use the GAMA tables
and rules.
If a metal liner is not present, a clay tile liner must be
present, or the chimney must be lined. (Fix 4)
Use a flashlight and small mirror at the cleanout or vent
connector to inspect the clay tile liner. If any of the
following problems are present:
•Tile sections misaligned
•Tile sections missing
•Gaps between tile sections
•Signsofcondensatedrainageatthecleanoutorvent
connectors
•Mortar protruding from between tile sections
•Use of sewer pipe or drainage pipe rather than an
approved fire clay tile
…then the chimney must be relined. (Fix 4)
Next, measure the size of the liner. It may be possible to
do this from the cleanout. The liner must be at least as
large as the minimum size established by the tables in
NationalFuel GasCode, NFPA54 /ANSI Z223.1- latest
edition and in the National Standard of Canada, CAN/
CGA B149.1 and .2 - latest editions and amendments. If
the liner is too small or too large, then the chimney must
be relined. (Fix 4)
Check 6 - Dilution Air.
If gas-fired appliances are to be vented into a clay tile
liner, a source of dilution air is required.
Dilution air cannot be obtained through:
•Induced draft appliances
•Natural draft appliances with vent dampers
Sufficient dilution air can ordinarily be obtained through
the draft hood of a natural draft appliance only if the
appliance’s vent connector does not include a vent
damper.
If dilution air will not be available, the chimney must be
relined. (Fix 4)
Check 7 - Complete the Installation.
If Checks 1 through 6 have been satisfactory, and the
lineris an acceptablesize as determinedby the tablesin
NationalFuel GasCode, NFPA54 /ANSI Z223.1- latest
edition and in the National Standard of Canada, CAN/
CGA B149.1 and .2 - latest editions and amendments,
then the clay tile liner can probably be used as a vent for
the gas appliances. However, the installer must keep in
mind the following factors which may render the tile liner
unsuitable for use as a vent:
•Extremely cold weather
•Long vent connectors
•Masonry chimneys with no air gap between the liner
and the bricks. (In practice, this can be difficult to
detect.)
•Exterior chimneys (The tables in National Fuel Gas
Code, NFPA 54 / ANSI Z223.1 - latest edition and in
theNationalStandardofCanada,CAN/CGAB149.1
and .2 - latest editions and amendments assume
interior chimneys.)

12
If,in the judgmentof thelocal gasutility, installer,and/or
local codes; one or more of the above factors is likely to
presenta problem,the chimneymust be relined. (Fix 4)
Fix 1 - Liner termination.
Any cap or roof assembly used with a liner must be
approved by the liner manufacturer for such use. The
liner and cap/roof assembly must then terminate above
the roof in accordance with the manufacturer’s instruc-
tions.
In some cases, a shorter extension above the roof may
be possible with a liner than would be required with a
masonry chimney.
For further information on relining, see Fix 4.
Fix 2 -Change venting arrangements
If the masonry chimney has more than one channel, it
may be possible to vent the gas appliances into one
channelandvent the solidorliquid fuelappliance(s)into
another channel(s). Do not vent an Air Command 80
inside of a metal liner with other appliances vented
outside the liner.
Alternatively, the homeowner may agree to discontinue
use of the fireplace (solid fuel appliance). If so, the tile
liner must be cleaned to remove creosote buildup. The
fireplace opening must then be permanently sealed.
If oil-fired appliance(s) are being replaced by gas-fired
appliance(s),thetilelinermustfirstbecleanedtoremove
the fuel oil residue.
If none of the above options is practical, the Air Com-
mand80 may need to be vented vertically with a BVent.
Under some conditions an Air Command 90 or 95 could
be installed rather than an Air Command 80. The Air
Command 90 or 95 can be vented horizontally or verti-
cally through PVC pipe.
Fix 3 - Rebuild the crown.
If the chimney crown is damaged, a qualified mason
must repair it in accordance with nationally recognized
building codes or standards. One such standard which
may be referenced is the Standard for Chimneys, Fire-
places,Vents,andSolidFuelBurningAppliances,ANSI/
NFPA 211.
Fix 4 - Relining.
Relining options include B vent and flexible liners.
If the chimney has diagonal offsets, B vent probably
cannot be used.
If B vent is to be used, it must be supported adequately.
Supports(suchasfirestopsorthimbles)mustbeusedto
prevent the B vent from coming into direct contact with
thetileliner orchimneywalls. Directcontactwould result
in higher heat loss, with an increased possibility of poor
venting system performance.
ItisnotacceptabletoventoneapplianceinsidetheBvent
and other appliances outside. The excess space be-
tweentheBventandthechimneywalls must becovered
at the top of the chimney by a weatherproof, corrosion
resistant flashing.
The B vent should then be topped with a listed vent cap.
The listed vent cap will, when installed per the
manufacturer’s instructions, prevent problems due to
rain, birds, or wind effects.
B vent installed as described above is considered to be
an enclosed vent system, and the sizing tables in Na-
tional Fuel Gas Code, NFPA 54 / ANSI Z223.1 - latest
edition and in the National Standard of Canada, CAN/
CGA B149.1 and .2 - latest editions and amendments
may be used.
If a flexible liner is to be used, it must be made of the
proper materials:
•For most residential applications, an aluminum liner
should be acceptable.
•If the combustion air supplied to the furnace will be
contaminatedwithcompoundscontainingchlorineor
fluorine, a liner of AL294C stainless steel should be
used. Common sources of chlorine and fluorine
compoundsincludeindoorswimmingpoolsandchlo-
rine bleaches, paint strippers, adhesives, paints,
varnishes, sealers, waxes (which are not yet dried)
and solvents used during construction and remodel-
ing. Various commercial and industrial processes
mayalsobesourcesofchlorine/fluorinecompounds.
•Heavier gauge 300 and 400 series stainless steel
liners were developed for use with oil or solid fuel
appliances. They are not suitable for use with gas-
fired appliances. Flexible liners specifically intended
and tested for gas applications are listed in the UL
“Gas and Oil Equipment Directory”. (UL Standard
1777).

13
For sizing of flexible liners, see Note 22 and the tables in
the National Fuel Gas Code, NFPA 54 / ANSI Z223.1 -
latest edition and in the National Standard of Canada,
CAN/CGA B149.1 and .2 - latest editions and amend-
ments.
Toinstalltheliner,readandfollowthelinermanufacturer’s
instructions and your local codes. Excess liner length
should be pulled out of the chimney and cut off. Use
cautionwhendoingthis,asthecutedgesofflexibleliners
may be sharp. Do not spiral excess liner inside of the
chimney. Support the liner as recommended by the liner
manufacturer.
Some manufacturers of flexible liners offer an insulation
sleeve designed to be added to the liner before it is
installed in the chimney. (Poured insulation, either ver-
miculite or other materials, is no longer recommended.)
Insulation will need to be added to the flexible liner if:
•Itisrequiredbythelinermanufacturer’s instructions.
•The previous liner was properly sized and installed,
and suffered from condensation damage.
•It is required by your local building codes.
Evenifnoneofthosethreeconditionsexistwhichrequire
additional liner insulation, the installer may wish to con-
sider it if:
• The local climate is very cold
• The chimney is very tall
• The vent connectors used are very long or have a
large number of elbows
• Local experience indicates that flexible liners in-
stalledwithoutinsulationarelikelytohavecondensa-
tion problems.
Insulation must be selected and installed in accordance
with the liner manufacturer’s instructions.
Finally, cap the chimney and terminate the liner in
accordance with the liner manufacturer’s instructions.
VI. Gas Piping
The rating plate is stamped with the model number, type
of gas and gas input rating. Make sure the furnace is
equipped to operate on the type of gas available.
Inlet Ga s Pressure
Natural Min. 5.0" W.C., Max. 10.0" W.C.
Propane Min. 11.0" W.C., Max. 14.0" W.C.
Inlet gas pressure must not exceed the maximum value
shown in table above.
NOTE: Adjusting the minimum supply pressure below
the limits in the above table could lead to unreliable
ignition.
Gas input to the burners must not exceed the rated input
shownontheratingplate.Overfiringofthefurnacecould
result in premature heat exchanger failure. Gas pres-
suresinexcessof14incheswatercolumncouldresultin
permanent damage to the gas valve.
IMPORTANT NOTE: The furnace will naturally derate
itself with altitude. Do not attempt to increase the firing
rate by changing orifices or increasing the manifold
pressure. This can cause poor combustion and equip-
ment failure.
At all altitudes, the manifold pressure must be within 0.3
inchesW.C.of that listedonthe “SpecificationSheet”for
the fuel used. At all altitudes and with either fuel, the air
temperature rise must be within the range listed on the
furnace nameplate.
Gas Piping
IMPORTANT NOTE: To avoid possible unsatisfactory
operation or equipment damage due to underfiring of
equipment, do not undersize the natural/propane gas
piping from the meter/tank to the furnace. Include all
applianceswhichmaybeoperatedsimultaneouslywhen
sizing a trunk line.
The gas pipe supplying the furnace must be properly
sized based on gas flow required, specific gravity of the
gas and length of the run. The gas line installation must
complywithlocalcodes,orintheabsenceoflocalcodes,
withthelatesteditionoftheNationalFuelGasCodeANSI
Z223.1.
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of Nominal Black Pipe Size
Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
CFH = BTUHFurnace Input
Heating Value of Gas (BTU/Cubic Foot)

14
Connecting Gas Piping - Natural Gas
Refer to Figure 11 for the general layout at the furnace.
The following rules apply:
1.Useblackironorsteelpipeandfittingsforthebuilding
piping.
2. Use pipe joint compound on male threads only. Pipe
jointcompound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4.Installadriplegtotrapdirtandmoisturebeforeitcan
enterthe gas valve.The drip legmust be aminimum
of three inches long.
5. Use two pipe wrenches when making connection to
the gas valve to keep it from turning. The orientation
ofthegasvalveonthemanifoldmustbethesameas
shipped from the factory.
6. Within six feet of the unit, install a manual shutoff
valve between the meter and the unit. If a union is
installed, the union must be downstream of the
manual shutoff valve, between the shutoff valve and
the furnace.
7. Tighten all joints securely.
8.Thefurnacemustbeconnectedtothebuildingpiping
by one of the following:
•Rigid metallic pipe and fittings.
•Semirigid metallic tubing and metallic fittings. Alu-
minum alloy tubing must not be used in exterior
locations.
•Listed gas appliance connectors, used in accor-
dance with the terms of their listing, must be
completely in the same room as the furnace.
•The connectors or semirigid tubing must be pro-
tectedagainstphysicalandthermaldamagewhen
installed. Aluminum-alloy tubing and connectors
must be coated to protect against external corro-
sion when in contact with masonry, plaster or
insulation or are subject to repeated wettings by
such liquids as water (except rain water), deter-
gents or sewage.
Figure 11
Upflow Installations
When the gas piping enters through the right side of the
furnace , the installer must supply the following fittings
(starting from the gas valve):
• 90 degree elbow
• Close nipple
• 90 degree elbow
• Straight pipe to reach the exterior of the furnace.
(Figures 12 & 13)
Figure12
Gas Inlet Through Furnace Right Side
A ground joint union, drip leg, and manual shutoff valve
mustalsobesuppliedbytheinstaller.Insomecases,the
installer may also need to supply a transition piece from
1/2" to another pipe size.
Figure13
Gas Inlet Through Furnace Bottom Side
(Upflow)
When the gas piping enters through the left side of the
furnace, the installer must supply the following fittings
(starting from the gas valve):
•Straight pipe to reach the exterior of the furnace.
(Figures 14 & 15)
•A ground joint union, drip leg, and manual shutoff
valve must also be supplied by the installer. In some
cases, the installer may also need to supply a tran-
sition piece from 1/2 inch to another pipe size.

15
Figure 14
Gas Inlet Through Furnace Left Side
(Upflow)
Figure 15
Gas Inlet Through Furnace Top Side
(Upflow)
The gas piping connections shown in Figures 13 and 14
are for a furnace equipped for a right hand discharge.
Adaptation for left hand discharge should be self ex-
planatory.
Figure 16
Horizontal Furnace
(Right Hand Discharge)
Counterflow Installations
When the gas piping enters through the left side of the
furnace,theinstaller must supplyastraight pipetoreach
the exterior of the furnace. (Figure 17)
Figure 17
Gas Inlet Through Left Side
(Counterflow)
A ground joint union, drip leg, and manual shutoff valve
mustalsobesuppliedbytheinstaller.Insomecases,the
installer may also need to supply a transition piece from
1/2" to another pipe size.
When the gas piping enters through the right side of the
furnace, the installer must supply the following fittings
(starting at the gas valve):
• 90 degree elbow.
• Close nipple.
• 90 degree elbow.
• Straightpipetoreachexterioroffurnace(Figure18).
A ground joint union, drip leg, and manual shutoff valve
mustalsobesuppliedbytheinstaller.Insomecases,the
installer may also need to supply a transition piece from
1/2 inch to another pipe size.
Figure 18
Gas Inlet Through Right Side
(Counterflow)
“Left side” and “right side” above are as viewed for a
counterflowinstallation. Adaptation for horizontal airflow
should be self explanatory.

16
Checking Gas Piping
CAUTION
To prevent personal injury or property
damageduetofire,thefollowinginstruc-
tions must be performed regarding gas
connections, pressure testing, location
of shutoff valve and installation of gas
piping.
Before placing in operation, leak test the unit and gas
connections. To avoid the possibility of explosion or fire,
never use a match or open flame to test for leaks. Never
exceed specified pressures for testing. Higher pressure
may damage the gas valve and cause overfiring, result-
ing in heat exchanger failure.
This unit and shutoff valve must be disconnected from
the gas supply piping system before supply piping sys-
tem pressure testing with test pressures in excess of 1/
2 psig (3.48 kPa).
Thisunit must beisolated fromthe gassupply systemby
closing its manual shutoff valve before pressure testing
of gas supply piping system with test pressures equal to
or less than 1/2 psig (3.48 kPa).
Tanks and Piping - Propane Gas Units
WARNING
Topreventdeath,personalinjuryorprop-
erty damage due to fire or explosion
caused by a propane gas leak, install a
gas detecting warning device. Since rust
can reduce the level of odorant in pro-
panegas,agasdetectingwarningdevice
is the only reliable way to detect a pro-
pane gas leak. Contact a local propane
gas supplier about installing a gas de-
tecting warning device.
WARNING
All metal inserts, screens or turbulators
mustberemovedfromtheheatexchanger
tubes when using propane gas. Failure
to comply could cause serious personal
injury or death. Failure to comply with
this requirement will also void warranty
coverage.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters
(See NBFU Manual 58).
For satisfactory operation, propane gas pressure must
be 10 inch W.C. at the furnace manifold with all gas
appliancesinoperation.Maintainingpropergaspressure
depends on three main factors:
1. Vaporization rate, depending on temperature of the
liquid, and “wetted surface” area of the container or
containers.
2.Properpressureregulation.(Two-stage regulationis
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and be-
tween second stage regulator and the appliance.
Pipe size will depend on length of pipe run and total
load of all appliances.
Completeinformationregardingtank sizing forvaporiza-
tion, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and pro-
pane gas suppliers.
Sincepropanegaswillquicklydissolvewhiteleadormost
standard commercial compounds, special pipe dope
must be used. Shellac base compounds resistant to the
actions of liquefied petroleum gases such as Gasolac,
Stalactic, Clyde’s or John Crane are satisfactory.
Refer to Figure 19 for typical propane gas installations.
Figure 19

17
Propane Gas Piping Charts
Sizing Between First and Second Stage Regulator
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
Pipe or Nominal Pipe Size
Tubing Tubing Size, O.D. Type L Schedule 40
Length, 3/8" 1/2" 5/8" 3/4" 7/8" 1/2" 3/4"
Feet
10 730 1,700 3,200 5,300 8,300 3,200 7,500
20 500 1,100 2,200 3,700 5,800 2,200 4,200
30 400 920 2,000 2,900 4,700 1,800 4,000
40 370 850 1,700 2,700 4,100 1,600 3,700
50 330 770 1,500 2,400 3,700 1,500 3,400
60 300 700 1,300 2,200 3,300 1,300 3,100
80 260 610 1,200 1,900 2,900 1,200 2,600
100 220 540 1,000 1,700 2,600 1,000 2,300
125 200 490 900 1,400 2,300 900 2,100
150 190 430 830 1,300 2,100 830 1,900
175 170 400 780 1,200 1,900 770 1,700
200 160 380 730 1,100 1,800 720 1,500
To convertto capacities at 15 psig settings - multiply by 1.130
To convertto capacities at 5 psig settings - multiply by 0.879
Sizing Between Single or Second Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on 1/2" W.C. pressure drop at 11" W.C. setting.
Capacities in 1,000 BTU/hour.
Pipe or Nominal Pipe Size
Tubing Tubing Size, O.D. Type L Schedule 40
Length, 3/8" 1/2" 5/8" 3/4" 7/8" 1-1/8" 1/2" 3/4" 1" 1-1/4" 1-1/2"
Feet
10 39 92 199 329 501 935 275 567 1,071 2,205 3,307
20 26 62 131 216 346 630 189 393 732 1,496 2,299
30 21 50 107 181 277 500 152 315 590 1,212 1,858
40 19 41 90 145 233 427 129 267 504 1,039 1,559
50 18 37 79 131 198 376 114 237 448 913 1,417
60 16 35 72 121 187 340 103 217 409 834 1,275
80 13 29 62 104 155 289 89 185 346 724 1,066
100 11 26 55 90 138 255 78 162 307 630 976
125 10 24 48 81 122 224 69 146 275 567 866
150 9 21 43 72 109 202 63 132 252 511 787
200 8 19 39 66 100 187 54 112 209 439 665
250 8 17 36 60 93 172 48 100 185 390 590
*Data in accordance with NFPA pamphlet NO. 54
WARNING
To prevent death, serious personal in-
jury or property damage due to fire or
explosion caused by a propane gas leak,
install a gas detecting warning device.
If the propane gas furnace is installed in
a basement, an excavated area or a con-
finedspace, awarning deviceis required
due to:
• Propane gas is heavier than air and
any leaking gas can settle in any low
areas or confined spaces.
• Propane gas odorant may fade, mak-
ing the gas undetectable except with
a warning device.
If the presence of gas is suspected, fol-
low the instructions on Page 2 of this
manual.
VIl. ElectricalWiring
WARNING
To prevent death or personal injury due
to electric shock, disconnect electrical
powerbeforechanginganyelectricalwir-
ing.
CAUTION
When servicing controls, label all wires
before disconnecting. Wiring errors can
cause improper and dangerous oper-
ation. After servicing is completed, al-
ways verify proper operation.
The unit wiring harness is an integral part of the furnace.
Fieldalterationtocomplywithelectricalcodesshouldnot
be required.
Power supply to the furnace must be NEC Class 1, and
mustcomplywith all applicablecodes.The furnacemust
be electrically grounded in accordance with the local
codes or, in their absence, with the latest edition of the
National Electrical Code, ANSI NFPA No. 70 and/or the
CSAC22.1Electrical Code. Afuseddisconnectmust be
providedandsizedinaccordancewiththeunitmaximum
overcurrent protection.
Figure 20
Typical Field Wiring
(24 VAC Control Circuit)
A 40 V.A. transformer and an integrated electronic con-
trol are built into the furnace to allow use with most
cooling equipment.
CAUTION
To avoid the risk of electrical shock,
wiring to the unit must be properly polar-
ized and grounded.
To provide more reliable sensing of flame, the ground
wire must run to the electrical panel.
Line voltage wiring must enter into the junction box
provided with the furnace.

18
Asshipped,the junction boxisattached totheleft sideof
the furnace (as viewed for an upflow installation). If this
is suitable for your installation, no changes are neces-
sary.
If the line voltage wiring is to enter through the right side
of the furnace (as viewed for an upflow installation),
relocate the junction box as shown in Figure 21.
Figure 21
Junction Box (Left Side)
WARNING
To prevent death or personal injury due
to electric shock, disconnect electrical
power.
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction
box to the left side of the furnace.
3.Disconnectthehosefromthepressureswitch.Leave
the other end attached to the induced draft blower.
4. Remove five wires entering junction box from split
grommet in blower deck.
5. Swap locations of the two bushings in the junction
box.
6. Rotate the junction box 180 degrees so the access
panel continues to face forward. The open snap
bushing should now be at the bottom.
7. Insert five wires into the split grommet on the right
side of the blower deck.
8. Insert the five wires through the open bushing in the
bottom of the junction box.
9.Attachthejunctionboxtotherightsideofthefurnace,
using the screws removed in step 2.
10. Reconnect the hose to the pressure switch.
11. Check the location of the pressure hose and all
wiring. Confirm that it will not be damaged by heat
from the burners or by the rotation of the fan. Also
confirmthatwiringlocationwillnotinterferewithfilter
removal or other maintenance.
After the junction box is in the desired location, use
washers to connect field-supplied conduit to the junction
box in accordance with NEC and local codes. Connect
hot, neutral, and ground wires as shown in the furnace
wiring diagram. The wires and ground screw are located
in the furnace junction box.
Lowvoltagewiringmayenterthroughtherightorleftside
of the furnace (as viewed for an upflow installation - top
or bottom for a horizontal installation). See Specification
Sheetforholelocations.Runthethermostatwiresthrough
either grommet in the blower deck. (Figure 21)
Lowvoltagewiresmaybeconnectedto theterminalstrip
as shown in Figure 22.
IMPORTANT NOTE: To avoid possible equipment mal-
function,routethelowvoltagewirestoavoidinterference
with filter removal or other maintenance.
Heating Fan
Off Adjustments
Low Voltage
Terminals
OR
ON
OFF
12
B1
B2
B3
B4
Pins (4)
Jumper
Style A
Style B
Figure 22
Integrated Ignition Control
(Viewed in an Upflow Installation)
Junction
Box

19
Air Circulation Fan Timing
All items in this section refer to the air circulation fan, not
to the induced draft fan. The timing sequence for the
induced draft fan is not adjustable.
When a call for cooling occurs, the circulation fan will
comeon.Itwillremain onfor45secondsafter the callfor
cooling ends. This fan timing is not adjustable.
During normal heating operation, the circulation fan will
come on 37 seconds after the gas valve opens. This
timing is not adjustable.
As shipped, the circulation fan will remain on for 90
secondsafter thegas valvecloses. Ifdesired, thistiming
may be adjusted. The adjustment pins or switches are
near the low voltage terminal strip. See Figure 23.
60
Second
Delay
12
ON
OFF
B1 B2 B3
B4
90
Second
Delay
12
ON
OFF
B1 B2 B3
B4
120
Second
Delay
12
ON
OFF
B1 B2 B3
B4
180
Second
Delay
12
ON
OFF
B1 B2 B3
B4
Style A Style B
Switches viewed in an upflow installation.
Figure 23
Heating Fan Off Adjustments
Heat Anticipator Setting
The heat anticipator in the room thermostat must be
correctlyadjustedtoobtainthepropernumberofheating
cycles per hour and to prevent room temperature from
“overshooting” the thermostat setting. Heat anticipator
must be set at 0.7 amps.
Line Voltage Connection of Optional Humidifier
and Electronic Air Cleaner
The control module is equipped with line voltage acces-
sory terminals used for controlling the power to an
optional field-supplied humidifier and/or electronic air
cleaner.
Accessory Load Specification
Air Cleaner: 1.0 Amp max. at 120 VAC
Humidifier: 1.0 Amp max. at 120 VAC
Accessory Installation:
Followtheelectronicaircleanerandhumidifiermanufac-
turers’ instructions for mounting and electrically ground-
ing these accessories. Check that the power supply to
the furnace has been disconnected. Wire the accesso-
ries to the control module as shown below. All connec-
tions to the control module are to be made through 1/4
inch female terminals.
Ifitisnecessarytosupplyadditionallinevoltagewiringto
theinteriorofthefurnace, thewiringmustcomplywith all
local codes. This wiring must have a minimum tempera-
ture rating of 105°C and must be routed away from the
burnercompartment.Alllinevoltagewiresplicesmustbe
made inside the furnace junction box.
Control Module
Cool
Heat Park
Park
Line
Transformer
EAC
Hum
Cir
Line
Transformer EAC Hum
Hot 120 VAC Neutral
120 VAC
Air
Cleaner
Humidifier
Optional
Accessories{
Figure 24
AccessoryOperation:Thefurnacecontrolmoduleener-
gizesthehumidifierwhenevertheinduceddraftbloweris
energized(whenanaircleanerisinstalledonthesystem,
the humidifier is not energized until the air cleaner is
energized).Thecontrolmoduleenergizestheaircleaner
whenever the air circulation blower is energized.

20
The following chart shows recommended minimum filter
sizes for each furnace model. Larger sizes are also
acceptable.
Minimum Recommended Filter Sizes
Qty. - NominalSize, Inches (Sq. In. Surface Area)
Size_Air Flow Disposable Permanent
045_30 1 - 20 X 25 (500) 1 - 15 X 20 (300)
070_30 1 - 20 X 25 (500) 1 - 15 X 20 (300)
070_40 2 - 14 X 25 (350) 1 - 16 X 25 (400)
090_30 1 - 24 X 24 (576) 1 - 16 X 25 (400)
090_50 2 - 18 X 25 (450) 1 - 20 X 25 (500)
115_40 2 - 14 X 25 (350) 1 - 18 X 25 (450)
115_50 2 - 18 X 25 (450) 1 - 20 X 25 (500)
140_50 2 - 18 X 25 (450) 1 - 20 X 25 (500)
Figure 25
Upflow/Horizontal Furnaces
Upflow Installations
This furnace contains rails for installing 16 x 25 x 1 filters
on each side of the interior furnace cabinet. A retainer is
also included for bottom return. Refer to the chart below
for filter sizes when using bottom return.
Bottom Return Air Filters
Size Filter Size, Inches Type
045, 070 14 X 25 X 1 P
90 16 X 25 X 1 P
115, 140 20 X 25 X 1 P
Figure 26
Theillustrationbelowshowshowthefilterisretainedover
the bottom return air opening.
Figure 27
One inch throwaway filters should be sized for a face
velocity of 300 feet per minute or less (14 x 25 x 1
throwaway=730CFMmax.;16x25x1throwaway=830
CFM max.; 18 x 25 x 1 throwaway = 940 CFM max.; 20
x 25 x 1 throwaway = 1040 CFM max.) All other filters
should be sized according to their manufacturer’s in-
structions.
For air delivery of less than 1800 CFM; use one side
return or bottom return.
For air delivery of 1800 CFM or higher; use two side
returns, or one side return plus bottom return.
Guide dimples locate the side and bottom return cutout
locations. Use a straight edge to scribe lines connecting
the dimples. Cut out the opening on these lines. An
undersized opening will cause reduced airflow. For bot-
tom return connection, remove the bottom of the cabinet
beforesettingthefurnaceontheraisedplatformorreturn
air duct.
VIlI. Circulating Air and Filters
Ductwork - Air Flow
Duct systems and register sizes must be properly de-
signed for the C.F.M. and external static pressure rating
of the furnace. Ductwork should be designed in accor-
dancewiththerecommendedmethodsof“AirCondition-
ing Contractors of America” Manual D.
A duct system must be installed in accordance with
Standards of the National Board of Fire Underwriters for
theInstallationofAirConditioning,WarmAirHeatingand
Ventilating Systems. Pamphlets No. 90A and 90B.
Aclosedreturnductsystemmustbeused,withthereturn
duct connected to the furnace. Supply and return con-
nections to the furnace may be made with flexible joints
toreducenoisetransmission.Topreventtheblowerfrom
interfering with combustion air or draft when a central
return is used, a connecting duct must be installed
betweentheunitandtheutilityroomwall.Aroom,closet,
or alcove must not be used as a return air chamber.
When the furnace is used in connection with a cooling
unit, the furnace should be installed in parallel with or on
the upstream side of the cooling unit to avoid condensa-
tion in the heating element. With a parallel flow arrange-
ment, the dampers or other means used to control the
flow of air must be adequate to prevent chilled air from
entering the furnace and, if manually operated, must be
equipped with means to prevent operation of either unit
unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be pro-
vided in the outlet air duct. This opening shall be acces-
sible when the furnace is installed and shall be of such a
sizethattheheatexchangercanbeviewedforvisuallight
inspectionorsuch thata sampling probecan beinserted
into the airstream. The access panel must be made to
prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the
returnairenteringthefurnacemustbebetween55°Fand
100°F.
When a furnace is installed so that supply ducts carry air
circulatedbyfurnacetoareasoutsidethespacecontain-
ing the furnace, the return air shall also be handled by a
ductsealedtothefurnacecasingandterminatingoutside
the space containing the furnace.
Filters - Read This Section Before Installing The
Return Air Ductwork
Filters must be used with this furnace. Discuss filter
maintenance with the building owner. Filters do not ship
with this furnace, but must be provided by the installer.
Filter(s) must comply with UL900 or CAN/ULCS111
standards. If the furnace is installed without filters, the
warranty will be voided.