Amana GUX-X User manual

Amana
Fayetteville, TN 37334
!RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
ATTENTION INSTALLING PERSONNEL
As a professional installer you have an obligation to
know the product better than the customer. This
includes all safety precautions and related items.
Prior to actual installation, thoroughly familiarize
yourself with this Instruction Manual. Pay special
attentiontoallsafetywarnings.Oftenduringinstallation
or repair it is possible to place yourself in a position
which is more hazardous than when the unit is in
operation.
Remember,itisyourresponsibilitytoinstalltheproduct
safely and to know it well enough to be able to 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
not supersede existing practices but should be
considered as supplemental information.
®
Amana Forced Air Central Furnace Design Complies With
Requirements Embodied in The American National Stan-
dard / National Standard of Canada Shown Below.
ANSI Z21.47•CAN/CGA-2.3 Central Furnaces
June 1999(2) 10318725
Table of Contents
I. Safety and Unit Location...................................................3
II. General Information........................................................... 4
III. Air Requirements ............................................................... 5
IV. Vent Pipe (All Models) and Combustion Air Pipe (GUD
Models) Materials ...............................................................7
V. Vent Piping - GUX (All Installations), GUC (All
Installations), and GUD (One Pipe Installations) ............8
VI. Combustion Air and Vent Piping (GUD - Two Pipe) .......9
VII. Condensate Piping ..........................................................14
VIII. Gas Piping ........................................................................14
IX. Electrical Wiring...............................................................18
X. Circulating Air and Filters...............................................19
XI. Sequence of Operation ...................................................21
XII. Start-Up, Adjustments, and Checks ..............................21
XIII. Maintenance .....................................................................26
XIV. Functional Parts List ....................................................... 28
GUX-X, GUC-X, & GUD-X
Gas-Fired
Warm-Air Furnace
Installation Instructions
Affix this manual, Specification Sheet and Users
Information Manual adjacent to the furnace.

2
To The Owner
It is important that you fill out the owner’s registration card
and mail it today. This will assist Amana in contacting you
should any service or warranty information change in the
future. When filling in the registration card, 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.
Keep the warranty certificate in a safe place, so you can
find it, if necessary.
If additional operating instructions are required, call the
dealer where the purchase was made.
To The 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, BTU input rating, air temperature rise, minimum or
maximum CFM, and motor speed connections.
Keepthisliteratureina safeplaceforfuturereference.
WARNING
If the information in these instructions is
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.
– If you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediatelycallyourgassupplierfrom
a neighbor’s phone. Follow the gas
supplier’s instructions.
• Ifyour gassuppliercannotbereached,
call the fire department.
– Installation and service must be
performedbyaqualifiedinstaller,service
agency or the gas supplier.
WARNING
Shouldoverheatingoccurorthegassupply
fail to shut off, turn off the manual gas
controlvalvetothefurnacebeforeshutting
off the electrical supply.

3
SAFETY
• When the furnace is heating, the return air tempera-
ture of the furnace must be between 55°F and 100°F.
• Furnaces installed in areas frequently contaminated
by: permanent wave solutions
chlorinated waxes or cleaners
chlorine based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
must be sealed to prevent contaminated air from
reaching the furnace. The furnace must still have an
adequate supply of combustion air, either from a
nearby uncontaminated room or from outdoors. For
details, see “AIR REQUIREMENTS” Section III.
• Provisions must be made for intake of combustion air
(GUD) and venting combustion products outdoors
through proper venting systems. The length of com-
bustionairpipe (GUD)andflue pipecouldbe a limiting
factor in locating the furnace. See Sections III and IV.
• Allow clearances from the enclosure as shown on
Specification sheet for fire protection, proper opera-
tion, and service access. These clearances must be
permanently maintained. The combustion and venti-
lating air openings in the front and top panels of the
furnace must never be obstructed.
• When the furnace is used in connection with a cooling
unit, the furnace must be upstream of, or in parallel
with, the cooling unit. For details see Section VlI.
• This furnace produces condensate as it operates. Do
not locate the furnace or its condensate drainage
system in an area subjected to below freezing tem-
peratures.
I. Safety and Unit Location
WARNING
To prevent personal injury or death due to
improper installation, adjustment,
alteration, service or maintenance, refer to
this manual or for additional assistance or
information consult a qualified installer,
service agency or the gas supplier.
WARNING
This product contains or produces a
chemical or chemicals which may cause
serious illness or death and which are
known to the State of California to cause
cancer, birth defects or other reproductive
harm.
WARNING
To prevent possible death, personal injury
or equipment damage due to fire, the
following points must be observed when
installing the unit.
WARNING
To prevent possible death, personal injury
orpropertydamageduetoelectricalshock,
the furnace must be located to protect the
electrical components from water.
CAUTION
This unit must not be used as a
“construction heater” during the finishing
phasesofconstructiononanewstructure.
This type of use may result in premature
failure of the unit due to extremely low
return air temperatures and exposure to
corrosive or very dirty atmospheres.

4
LOCATION
• Centralize the furnace as is practical with respect to
the air distribution system.
• The furnace must be set on a level floor to enable the
condensateproducedtodrainproperly.Ifthefloor may
become wet or damp at times, the furnace should be
supported above the floor on a concrete base sized
approximately 1-1/2” larger than the base of the fur-
nace.
• Do not install the furnace directly on carpeting, tile, or
combustible material other than wood flooring.
• Do not install the furnace where the combustion air is
exposed to the following substances:
permanent wave solutions
chlorinated waxes or cleaners
chlorine based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen-type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials.
Exposure to contaminated combustion air will result in
safety and performance-related problems.
• If the furnace is installed in a residential garage, the
furnace must be positioned so that the burners and
ignition source are located not less than 18 inches
(457 mm) above the floor and protected from physical
damage by vehicles.
II. General Information
WARNING
Possibledeath,personalinjuryorproperty
damageduetofire,explosion,smoke,soot,
condensation, electrical shock or carbon
monoxide may result from improper
installation, repair, operation, or
maintenance on this product.
WARNING
To prevent death, personal injury or
property damage due to fire, do not install
this furnace in a mobile home, trailer, or
recreational vehicle.
To ensure safe and efficient operation, install, operate,
and maintain this upflow furnace in accordance with these
installation and operating instructions, all local building
codes and ordinances, or with the latest edition of the
National Fuel Gas Code, NFPA 54/ANSI Z223.1*, and/or
CAN/CGA B149 Installation Codes, local plumbing or
waste water codes and other applicable local codes.
The rated heating capacity of the furnace should be
greater than or equal to the total heat loss of the area to be
heated. The total heat loss should be calculated by an
approved method or in accordance with “A.S.H.R.A.E.
Guide” or “Manual J-Load Calculations” published by the
Air Conditioning Contractors of America.
*Obtain from: American National Standards Institute 1430
Broadway, New York, NY 10018.
TRANSPORTATION DAMAGE
All furnaces are securely packed in shipping containers
testedaccordingto the InternationalSafeTransit Associa-
tion standards. The carton must be checked upon arrival
for external damage. If damage is found, a request for
inspection by carrier’s agent must be made in writing
immediately.
The furnace must be carefully inspected on arrival for
damage and bolts or screws which may have come loose
in transit. In the event of damage the consignee should:
1. Make a notation on delivery receipt of any visible
damage to shipment or container.
2. Notify carrier promptly and request an inspection.
3. With concealed damage, carrier must be notified as
soon as possible - preferably within five days.
4. File the claim with the following support documents
within a nine month statute of limitations.
• Original or certified copy of the Bill of Lading, or
indemnity bond.
• Original paid freight bill or indemnity in lieu thereof.
• Original or certified copy of the invoice, showing
trade and other discounts or reductions.
• Copy of the inspection report issued by carrier’s
representative at the time damage is reported to
carrier.
The carrier is responsible for making prompt inspection of
damage and for a thorough investigation of each claim.
The distributor or manufacturer will not accept claims from
dealers for transportation damage.
EXISTING FURNACE REMOVAL
Note : When an existing furnace is removed from a
venting system serving other appliances, the venting
system may be too large to properly vent the remaining
attached appliances.
The following steps shall be followed with each appliance
remainingconnectedtothecommonventingsystemplaced
in operation, while the other appliances remaining con-
nectedtothe common venting systemarenot in operation.
(a) Seal any unused openings in the common venting
system.
(b) Visually inspect the venting system for proper size
andhorizontalpitch and determinethereis no block-

5
age or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
(c) Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance
not connected to the common venting system. Turn
on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at maxi-
mum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
(d) Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening after
5minutesof mainburneroperation. Usetheflame of
a match or candle, or smoke from a cigarette, cigar,
or pipe.
(f) After it has been determined that each appliance
remainingconnectedto the common venting system
properlyvents whentestedas outlinedabove, 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, NFPA 54/ANSI Z223.1.
If resizing any portion of the common venting system, use
the appropriate table in Appendix G in the latest edition of
the National Fuel Gas Code, NFPA 54/ANSI Z223.1.
THERMOSTAT LOCATION
Locate the thermostat in an area having good air circula-
tion, about 5 feet high on a vibration-free inside wall.
Do not install the thermostat where it may be affected by:
• drafts or dead spots behind door, in corners or under
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.
Consult the instructions packaged with the thermostat for
mounting instructions. See Section IX for wiring and
adjustments to thermostat.
III. Air Requirements
WARNING
Possibledeath,personalinjuryorproperty
damagemay occurif thefurnace and other
fuel-burning appliances are not provided
withenoughfreshairforpropercombustion
and ventilation of flue gases. 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
much tighter around doors and windows so air infiltration
is minimal. This creates a problem supplying combustion
and ventilation air for gas fired and other fuel burning
appliances. Use of appliances pulling air out of the house
(clothes dryers, exhaust fans, fireplaces, etc.) increases
this problem causing appliances to starve for air.
Most homes will require outside air be supplied to the
furnace area by means of ventilation grilles or ducts
connecting directly to the outdoors or spaces open to the
outdoors such as attics or crawl spaces.
The following information on air for combustion and
ventilation is reproduced from the National Fuel Gas
Code NFPA 54/ANSI Z223.1, Section 5.3.
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 in-
stalled so that all air combustion is obtained from the
outside atmosphere and all flue gases are discharged
to the outside atmosphere, or (2) enclosed furnaces
which incorporate an integral total enclosure and use
only outside air for combustion and dilution of flue
gases.
(b) Equipment shall be installed in a location in which
the facilities for ventilation permit satisfactory com-
bustion of gas, proper venting and the maintenance
of ambient temperature at safe limits under normal
conditions of use. Equipment shall be located so as
not to interfere with proper circulation of air. When
normal infiltration does not provide the necessary
air, outside air shall be introduced.
(c) In addition to air needed for combustion, process air
shall be provided as required for: cooling of equip-
ment or material, controlling dew point, 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 person-
nel.
(e) While all forms of building construction cannot be
covered in detail, air for combustion, ventilation and
dilution of flue gases for gas utilization equipment
vented 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 ad-
equacy of a space to provide combustion air require-
ments.
5.3.2 Equipment Located in Unconfined Spaces: In
unconfined spaces (see definition below) in buildings,
infiltration may be adequate to provide air for combus-

6
tion ventilation and dilution of flue gases. However, in
buildings of tight construction (for example, weather
stripping,heavilyinsulated,caulked,vaporbarrier,etc.),
additional air may need to be provided using the meth-
ods described in 5.3.3-b or 5.3.4.
Space, Unconfined. For purposes of this Code, a space
whose volume is not less than 50 cubic feet per 1,000
BTU per hour of the aggregate input rating of all
appliances installed in that space. Rooms communicat-
ing 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: Theconfined space
shall be provided with two permanent openings
communicating directly with an additional room(s)
of sufficient volume so that the combined volume of
all spaces meets the criteria for an unconfined space.
The total input of all gas utilization equipment in-
stalled in the combined space shall be considered in
making this determination. Each opening shall have
a minimum free area of 1 square 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 (See 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 com-
mencing within 12 inches of the top and one com-
mencing within 12 inches of the bottom of the enclo-
sure.The openingsshall communicatedirectly, orby
ducts,withtheoutdoorsorspaces (crawl or attic)that
freely communicate 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 (See
Figure 2).
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 mini-
mumfree areaof1 squareinch per 4,000BTU 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.

7
3. When communicating with the outdoors through
horizontal ducts, each opening shall have a mini-
mumfree areaof1 squareinch per 2,000BTU per
hour of total input rating of all equipment in the
enclosure (See 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-sectional area as the free area of the open-
ingsto which they connect. The minimum dimen-
sion 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
having jurisdiction, provides an adequate supply of air
for 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.Iftheareathrougha designoflouver
or grille is known, it should be used in calculating the
size of opening required to provide the free area speci-
fied. If the design and free area is not known, it may be
assumed 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 position or interlocked with the equipment so
that they are 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.
IV. Vent Pipe (All Models) and
Combustion Air Pipe (GUD Models)
Materials
WARNING
Failure to follow these instructions can
result in bodily injury or death from
asphyxiation.Therefore,carefullyreadand
followallinstructionsgiveninthissection.
Inordertoachievehighefficiency,theproductsofcombus-
tion from this furnace are cooled to the point where
condensationtakes place. Consequently,the ventingmust
be done in a different manner and with different materials
than with a conventional system. Two- or three-inch PVC
Schedule 40 pipe meeting ASTM D1785, PVC primer
meeting ASTM F656 and PVC solvent cement meeting
ASTM D2564 specifications must be used. Only DWV type
fittings meeting ASTM D2665 and ASTM D3311 can be
used. Carefully follow the manufacturer’s instructions in
cutting, cleaning, and solvent cementing of PVC or ABS
pipe.
As an alternate to PVC pipe, primer, solvent cement, and
fittings; ABS materials which are in compliance with the
following specifications may be used: two- or three-inch
ABS Schedule 40 pipe must meet ASTM D1527 and, if
used in Canada, must be CSA listed. Solvent cement for
ABS to ABS joints must meet ASTM D2235 and, if used in
Canada, must be CSA listed. The solvent cement used for
the PVC to ABS transition joint must meet ASTM D3138.
Fittings must be DWV type fittings which meet ASTM
D2661 and ASTM D3311 and, if used in Canada, must be
CSA listed. Carefully follow the manufacturer’s instruc-
tions in cutting, cleaning, and solvent cementing PVC or
ABS pipes.
WARNING
Solvent cements are combustible liquids
and should be kept away from all ignition
sources. (i.e. sparks, open flames and
excessive heat). Avoid breathing cement
vapors or contact with skin and eyes.
All 90 degree elbows must be medium (1/4 bend DWV) or
long radius (long sweep 1/4 bend DWV) types conforming
to ASTM D3311. A medium radius (1/4 bend) elbow is 3-
1/16 inch minimum from the plane of one opening to the
centerline of the other opening for 2 inch pipe (4-9/16 inch
for 3 inch pipe).
This furnace must not be connected to any type B, BW, or
L vent or vent connector and must not be vented into any
portion of a factory built or masonry chimney, except when
used as a pathway for PVC pipe as described below
Flexible couplings for joining PVC pipe (sometimes called
“nohubconnectors”) have been usedbysome installers to
connect the field supplied portion of the vent system to the

8
must terminate at least one foot outside to keep moist
combustion products away from the structure. The vent
terminationmust be atleast three feetabove anyforcedair
inlet located within ten feet. It must be at least four feet
below, four feet horizontally from or one foot above any
door, window, or gravity air inlet into any building. The vent
must terminate at least one foot above ground level. If
heavy snow is expected locally, this distance may need to
be increased. The vent shall not terminate over public
walkways, or over an area where condensate or vapor
could create a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or other equip-
ment. Drill a 2-3/8 inch diameter hole through the wall for
2 inch pipe. (For 3 inch pipe, drill a 3-1/2 inch diameter
hole.) Cut a piece of PVC (ABS) pipe that is the thickness
of the wall plus the depth of the sockets of the fittings to be
installed on the inside and outside of the walls. To prevent
the vent pipe from moving and possibly damaging connec-
tions, locate the fitting on the inside wall and a coupling on
the outside wall as shown in Fig. 5. To prevent condensate
from freezing inside the PVC flue pipe in extremely cold
conditions or in long outdoor runs, insulation may be
required on the cut side of the PVC pipe. Use 1/2 inch
thickness closed cell foam insulation such as Armaflex or
Insultube.
Figure 5
Horizontal Vent Termination
In a basement installation, the vent pipe may be run
between the joist spaces. If the vent must go below the
joists, then the pipe must run up into the last joist space to
go through the header. Two 45° elbows should be used
rather than 90’s. The horizontal run must not have any sag
that can hold condensate and should pitch up at least 1/4
inch per foot so that condensate will run back to the unit to
drain. Support the horizontal run at least every three feet.
Allow for some expansion and contraction from tempera-
ture fluctuations. The normal direction changes usually
account for this, but if you have a long run followed by a
shortoffset oflessthan40inches suchas goingup intothe
last joist space, the pipe should be tightly clamped to
preventflexloading on the fittings.Sealaround the pipe on
the outside wall with silicone caulking material.
If the vent is to be run vertically through the roof, it must
extend at least 12 inches above the roof line and shall be
at least 12 inches from any vertical wall. It must terminate
at least three feet above any forced air inlet located within
10 feet, and at least 12 inches from any door, window, or
gravity air inlet into any building. If heavy snow is expected
to remain on the roof, the clearances to vertical walls and
theroof mayneedto beincreased.The ventmust bemade
furnace. Amana does not encourage nor recommend
using these connectors. However, if you do choose to use
“no-hub connectors,” the connectors must be gas tight,
water tight, and able to withstand continuous exposure to
the warm, moist, acidic flue products of the furnace.
It is the responsibility of the installer to follow the manufac-
turers’ recommendations and to verify that all flue pipe
connectors used are compatible with the furnace flue
products. In addition the connectors must possess ad-
equate structural integrity to prevent flue pipe separations
during furnace operation.
V. Vent Piping - GUX (All Installations),
GUC (All Installations), and GUD
(One Pipe Installations)
IMPORTANT: The length of the vent pipe affects the
performance of the furnace and therefore must be care-
fully sized.
Pipe Diameter for GUC(All Models),
GUX (All Models), and GUD045 (One Pipe Venting)
# of Inside
Elbows 5 to 10 feet 10 to 15 feet 15 to 20 feet 20 to 25 feet 25 to 30 feet 30 to 35 feet 35 to 40 feet 40 to 45 feet 45 to 50 feet
1 2"2"2"2"2"2"2"3"3"
2 2"2"2"2"2"2"2"3"3"
3 2"2"2"2"2"2"3"3"3"
4 2"2"2"2"2"3"3"3"3"
5 2"2"2"2"2"3"3"3"3"
6 2"2"2"2"3"3"3"3"3"
7 2"2"2"3"3"3"3"3"3"
8 2"2"3"3"3"3"3"3"3"
Pipe Diameter for GUD070
(One Pipe Venting)
# of Inside
Elbows 5 to 10 feet 10 to 15 feet 15 to 20 feet 20 to 25 feet 25 to 30 feet 30 to 35 feet 35 to 40 feet 40 to 45 feet 45 to 50 feet
1 2"2"2"2"2"2"2"3"3"
2 2"2"2"2"2"2"2"3"3"
3 2"2"2"2"2"2"3"3"NA
4 2"2"2"2"2"3"3"NANA
5 2"2"2"2"2"3"NANANA
6 2"2"2"2"3"NANANANA
7 2"2"2"3"NANANANANA
8 2" 2" 3" NANANANANANA
Pipe Diameter for GUD090, GUD115
(One Pipe Venting)
# of Inside
Elbows 5 to 10 feet 10 to 15 feet 15 to 20 feet 20 to 25 feet 25 to 30 feet 30 to 35 feet 35 to 40 feet 40 to 45 feet 45 to 50 feet
1 3"3"3"3"3"3"3"3"3"
2 3"3"3"3"3"3"3"3"3"
3 3"3"3"3"3"3"3"3"NA
4 3"3"3"3"3"3"3"NANA
5 3"3"3"3"3"3"NANANA
6 3"3"3"3"3"NANANANA
7 3"3"3"3"NANANANANA
8 3" 3" 3" NANANANANANA
Theinsidefeetofstraight pipeandinsideelbowsrepresent
the venting system from the furnace to the inside wall.
Follow termination instructions for going from the inside
wall to the outside in the next paragraph.
When the vent pipe goes through an outside wall, the vent

9
tight where it penetrates the roof with a proper flashing
such as used with a plastic plumbing vent. The vent may
be run through an existing unused chimney: however, the
pipe must be used all the way through to at least 12 inches
above the top of the existing chimney. The space between
the vent pipe and the chimney must be closed with a
weather tight, corrosion resistant flashing. Never vent with
anexistingapplianceorventusedbyasolidfuelappliance.
WARNING
Uponcompletionofthefurnaceinstallation,
carefully inspect the entire flue system
both inside and outside the furnace to
assure it is properly sealed. Leaks in the
flue system can result in serious personal
injury or death due to exposure to flue
products, including carbon monoxide.
CANADIAN VENTING REQUIREMENTS
In Canada, venting shall conform to the requirements of
the current CANI-B149 Installation Codes.
Use only C.S.A. Listed 2 inch or 3 inch nominal diameter
PVC or ABS pipe and fittings throughout.
The Minimum vent consists of 3 feet of straight pipe with
2 elbows (9 equivalent feet).
A single wall vent shall not be run vertically through the
roof. The vent may be run through an existing unused
chimney as described in the previous venting section
provided the space between the vent pipe and the
chimney is insulated and closed with a weather tight,
corrosion resistant flashing.
Cut all vent pipe at right angles. Remove inside and
outside burr at each cut. Use cleaner to clean pipe and
fitting socket. Use CSA listed cement to fasten pipe and
fittings.
Follow manufacturers cleaning and cementing instruc-
tions carefully to avoid leakage.
Note: All piping exposed outdoors or in unheated areas
must be insulated with 1/2 inch thick closed cell foam
insulation such as “armaflex” or “insultube”.
The vent terminal shall not be located:
1. Less than 12 inches above the finished grade line.
2. Less than 36 inches from any building opening or any
gas service regulator. (For gas service regulators in
the Province of Ontario, 72 inches.)
3. Less than 72 inches from the combustion air inlet of
another appliance.
4. Directly above a gas utility meter or service regulator.
5. Over a walkway unless 84 inches above grade.
VI. Combustion Air and Vent Piping
(GUD - Two Pipe)
GENERAL INFORMATION AND SAFETY
PRECAUTIONS
WARNING
Failure to follow these instructions can
result in bodily injury or death from
asphyxiation.Therefore,carefullyreadand
followallinstructionsgiveninthissection.
CAUTION
Terminate the combustion air intake as far
as is practical from the air conditioning
unit or heat pump, swimming pools,
swimming pool pumping units, and dryer
vents.
All combustion air and exhaust piping must be installed in
accordance with local codes and these instructions.
When the furnace is installed in a confined space where
the minimum clearances to combustible surfaces (see
Specification Sheet) are applied, such as in a closet or a
utility room, two ventilation openings are required with a
total minimum free area of 0.25 square inches per 1,000
BTUH of the furnace input rating. One opening must be
within 12 inches of the top and one must be within 12
inches of the bottom of the confined space. In typical
construction, the clearance between the door and door
frame will usually be adequate to satisfy this ventilation
requirement.
When the GUD furnace is installed in the same space with
other gas appliances, such as a water heater, make sure
there is an adequate supply of combustion and ventilation
air for the other appliances. See the latest edition of the
National Fuel Gas Code NFPA 54/ANSI Z223.1. for deter-
mining the combustion air requirements for the appli-
ances.
The GUD furnaces are supplied with a 3 inch air intake
terminal screen. This screen is shipped in the same plastic
sack that held this manual. For both vertical and horizontal
installations, insert the screen into the air intake terminal
until it is firmly secured at the hub of the terminal elbow.
Ifthevent(flue)pipeisexposedto extremelycoldtempera-
tures and/or long runs through unheated spaces or out-
doors,insulationmayberequiredontheoutsideofthevent
pipe to prevent condensate from freezing. Canadian in-
stallers must take note of the “Canadian Venting Require-
ments” in this section. Where required, use 1/2 inch thick
closed cell foam insulation such as Armaflex or Insultube.
Note: Inspect the flue for leaks before installing any
insulation.
If the combustion air pipe is to be installed above a
suspended ceiling or other area where dripping of conden-
sation will be objectionable, insulation of the combustion
air pipe may be required. Where required, use 1/2 inch

10
HORIZONTAL VENT/INTAKE TERMINATIONS
12" Min.
Vent
24" Max.
3" Min.
12" Min. Screen
24" Max.
Air
Intake
90°
Medium
Radius
Elbow
Figure 6
Horizontal Vent Termination
Position the combustion air intake terminal away from
obstructions, above anticipated snow accumulations, and
at least 12 inches above grade, as shown in Figure 6.
The exhaust vent must penetrate the wall within the
shaded region as shown in Figure 6.
All exhaust vent and air intake terminal fittings must be
medium radius (1/4 bend DWV) 90 degree elbows.
To prevent unnecessary shutdown of furnace due to
pressure switch trips, always determine anticipated snow
accumulation level, and install the terminals accordingly to
prevent exhaust vent and air intake blockages.
If installation above snow accumulation is required, add
additionalelbowsasshownin Figure7. A12inchminimum
clearance between the air intake and the highest antici-
pated snow level must be maintained. The exhaust vent
must penetrate the wall within the shaded region as shown
in Figure 7.
Air Intake
Screen
90°
Medium Radius
Elbow Vent
12" Min.
24" Max.
12" Min.
24" Max.
3" Min.
12" Min. Above
Highetst Anticipated
Snow Level
Figure 7
Horizontal Vent Termination Above
Anticipated Snow Level
thick closed cell foam insulation such as Armaflex or
Insultube.
LOCATION OF EXHAUST AND INTAKE
TERMINATIONS
This furnace can be installed with either a vertical or
horizontal direct vent. In either case, the exhaust vent and
the combustion air intake pipe must be located on the
same side of the structure and separated by no less than
3 inches and no more than 24 inches.
This ensures enough distance to prevent flue gas recircu-
lation and limits the distance to ensure the vent outlet and
air inlet terminals are in the same atmospheric pressure
zone.
The following points must also be considered when install-
ing the vent pipe in either a horizontal or vertical applica-
tion:
1. The vent termination must be at least 3 feet above any
forced air inlet located within 10 feet.
Exception: This provision shall not apply to the com-
bustion air intake of a direct vent furnace.
2. The vent termination must be at least 12 inches from
any door, window, or gravity air inlet into any building.
3. The vent must terminate at least 2 feet above ground
level or roof level. If heavy snow accumulation is
expected, this distance will need to be increased.
4. The vent shall not terminate over public walkways or
over an area where condensate or vapor could create
a nuisance or hazard or could be detrimental to the
operation of regulators, relief valves, or other equip-
ment.
5. In addition, the combustion air intake should not be
terminated in areas that are frequently very dusty or
dirty.
CAUTION
Donot terminate thecombustion air intake
wheretheairisoftenheavilycontaminated
with compounds containing chlorine or
fluorine. Common residential sources of
such compounds include:
• Swimming pools and swimming pool
pumps/filter
• Clothes dryer vents
• Remote air conditioning or heat pump
units (A refrigerant leak would
contaminate the combustion air.)
• Plumbing vent stacks
• Bathroomorswimmingpoolexhaustfans
• Undried paint strippers, adhesives,
paints, varnishes, sealers, waxes, and
solvents. These are often used during
new construction or remodeling.
Various commercial and industrial
processesmayalsobesourcesofchlorine/
fluorine compounds.

11
Do not point terminals into window wells, stairwells, al-
coves or other recessed areas. It is preferable for the air
intake to terminate on opposite or adjacent sides of the
structure from the dryer vent. If this is not practical, main-
tain a 3 foot clearance (residential laundry) or a 10 foot
clearance (commercial laundry).
VERTICAL VENT/INTAKE TERMINATIONS
If the vent and air intake pipes are to be run vertically
throughtheroof,they mustextendatleast12inchesabove
the roof line and shall be no closer than 12 inches to any
vertical wall. The vent pipe must extend at least 12 inches
above the air intake (See Figure 8). In areas where heavy
snow accumulation is expected, these distances will need
to be increased. The vent and air intake pipes must be
made tight where they pass through the roof with a proper
flashing such as used with a plastic plumbing vent.
Maintain at least a three foot clearance from the air intake
pipe to plumbing vent stacks.
90°
Medium Radius
Elbow
12" Min.
Vent
24" Max.
3" Min.
Air Intake
12" Min.
Figure 8
Vertical Vent Termination
Theventand airintakepipe mayberunthroughanexisting
unused chimney. However, the pipes must be run all the
way through the chimney, with the air intake pipe terminat-
ing at least 12 inches above the top of the chimney.
SeeFigure9for explanation. The flue pipe mustterminate
at least 12 inches above the air intake. The air intake and
exhaust may run side by side or as far apart as necessary
within the chimney.
The open space around the two pipes must be closed with
aweather tight,corrosionresistant flashing.NEVER VENT
WITH AN EXISTING APPLIANCE OR A VENT USED BY
A SOLID FUEL APPLIANCE.
Two 90° Medium
Radius Elbows
Air
Intake
Screen
12"
12"
Vent
Figure 9
Venting Through Existing Chimney
VENT/INTAKE TERMINATIONS FOR INSTALLATION
OF MULTIPLE DIRECT VENT FURNACES
If more than one direct vent furnace is to be installed
vertically through a common roof top, maintain the same
minimum clearances between the exhaust vent and air
intake terminations of adjacent units as with the exhaust
vent and air intake terminations of a single unit (Figure 8).
If more than one direct vent furnace is to be installed
horizontally through a common side wall, maintain the
clearances as shown in Figure 10. Always terminate all
exhaust vent outlets at the same elevation and always
terminate all air intakes at the same elevation.
12" Min.
Vents
24" Max.
3" Min.
12" Min. Screen
24" Max.
Air
Intakes
90°
Medium
Radius
Elbows
24" Max.
3" Min.
Min.
Figure 10
Horizontal Venting Of Multiple Units
EXHAUST VENT AND COMBUSTION AIR INLET
PIPES SIZING
ConsultTables1to3toselectthe properdiameterexhaust
and combustion air piping. The vent and air intake piping
is sized for each unit model number based on inside piping
length and number of inside 90° elbows required. Two 45°
elbows are equivalent to one 90° elbow. For all piping, the
elbow(s) used for vent & air pipe termination outside the

12
structure as shown in Figures 6, 8, and 9 are not to be
countedwhenusing Tables1through3.Theadditionaltwo
90° elbows as shown in Figure 7 must be counted as part
of the total number of inside elbows when using Tables 1
- 3. WHEN THE VENT SYSTEM REQUIRED IS BORDER-
LINE WITH NEXT SIZE COMBINATION CATEGORY,
USE THE NEXT LARGER SIZE.
Important: One short radius 90° elbow is equivalent to 3-
1/3 medium radius elbows. For this reason, short radius
90° elbows must not be used. The proper centerline-to-
centerline dimensions for medium radius 90° elbows are
shown below in Figure 11.
Elbow or
Coupling
Inside Wall
90° Elbow
Outside To Ground
12" Min.
3-1/16" Min. For 2" Pipe
4-9/16" Min. For 3" Pipe
Figure 11
Medium Radius Elbow Dimensions
EXAMPLE:
An installation calls for a 45,000 Btuh furnace. It must be
vented 50 inside feet and use three inside medium radius
90° elbows on both inlet and exhaust. With this in mind, we
must look at Table 1 to determine the correct vent and air
intake pipe size. With three elbows and 50 feet of straight
pipe, 3 inch air intake pipe must be used and 2 inch vent
pipe.
Important: When three inch diameter exhaust pipe is
used, the transition from two inch to three inch pipe must
be made in a vertical run. This is necessary for proper
condensate drainage and pressure switch operation.
VENT PIPE INSTALLATION
The size of the vent and air intake pipes is determined by
the heating capacity of the furnace and the length and
number of elbows of the pipe runs. To properly size the
pipes, refer to the previous section.
Use only the fittings, primer, and solvent cement which are
described in Section IV. An air intake screen is supplied
with the furnace and should be installed as shown in
Figures 6-10. Do not place a screen in the exhaust vent
termination. The furnace flue products could cause it to
corrode.
WARNING
Topreventdeath,personalinjuryorproperty
damage, solvent cements are combustible
liquids and should be kept away from all
ignition sources (i.e. sparks, open flames
andexcessiveheat).Avoidbreathingcement
vapors or contact with skin and eyes.
Undersomeconditions,insulationofsomeorall ofthevent
pipe and/or combustion air pipe may be required. Do not
install insulation until after the flue system has been
inspected for leaks as described below.
WARNING
To prevent death, personal injury or
propertydamage dueto carbonmonoxide,
carefully inspect the entire flue system
both inside and outside the furnace after
installation is completed, to assure it is
properlysealedandnotleakingfluegases.
For each 2 inch pipe, drill a 2-3/8 inch diameter hole
through the wall at the proper location.
For each 3 inch pipe, drill a 3-1/2 inch diameter hole
through the wall at the proper location.
Cut a piece of PVC (ABS) pipe that is the thickness of the
wall plus the depth of the sockets of the fittings to be
installed on the inside and outside of the walls.
To prevent the vent pipe from moving, and possibly dam-
aging the connections, locate the fittings on the inside wall
and the elbow on the outside as shown in Figure 11 for the
air intake.
In a basement installation, the pipes may be run between
the joist spaces. If the pipes must go below the joists, then
thepipesmust run up into thelastjoist space to go through
the header. Two 45° elbows should be used rather than
90’s. The horizontal run of exhaust pipe must not have any
sag that can hold condensate and should reach up at least
1/4inch perfootsothatcondensate willrun backtotheunit
to drain. Support the horizontal run at least every three
feet.
Allow for some expansion and contraction from tempera-
ture fluctuations. The normal direction changes usually
account for this, but if you have a long run followed by a
shortoffset oflessthan40inches suchas goingup intothe
last joist space, the pipes should be tightly clamped to
preventflexloading on the fittings.Sealaround the pipe on
the outside wall with silicone caulking material.

13
# of
Inside 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90
Elbows Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet Feet
Inlet 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA
Inlet 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA
Inlet 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA
Inlet 2" 2" 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA NA
Inlet 2" 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA NA NA
Inlet 2" 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA NA NA NA
Inlet 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA NA NA NA NA
Inlet 2" 2" 2" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA NA
Exhaust 2" 2" 2" 2" 2" 2" 2" 3" 3" NA NA NA NA NA NA NA NA
GUD045X**B, GUD070X**B Direct Vent Venting Table
3
4
5
Vent
Type
1
2
6
Inside Feet of Straight Pipe
7
8
TABLE 1
5-10 ft 10-15
ft 15-20 ft 20-25 ft 25-30 ft 30-35 ft 35-40 ft 40-45 ft 45-50 ft 50-55 ft 55-60 ft 60-65 ft 65-70 ft 70-75 ft 75-80 ft 80-85 ft 85-90 ft
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA
Exhaust 2" 2" 2" 2" 2" 3" 3" 3" 3" 3' 3" 3" 3" 3" 3" 3" NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA
Exhaust 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA
Exhaust 2" 2" 2" 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA
4Inlet
3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA
Exhaust 2" 2" 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA
Exhaust 2" 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA
Exhaust 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA NA
8
Inside Feet of Straight Pipe
2
3
5
6
7
1
# of Inside
Elbows Vent Type
GUD090X**B Direct Vent Venting Table
TABLE 2
5-10 ft 10-15
ft 15-20 ft 20-25 ft 25-30 ft 30-35 ft 35-40 ft 40-45 ft 45-50 ft 50-55 ft 55-60 ft 60-65 ft 65-70 ft 70-75 ft 75-80 ft 80-85 ft 85-90 ft
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA
Exhaust 2" 2" 2" 3" 3" 3" 3" 3" 3" 3' 3" 3" 3" 3" 3" 3" NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA
Exhaust 2" 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA
Exhaust 2" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA
Inlet 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA NA
Exhaust 3" 3" 3" 3" 3" 3" 3" 3" 3" NA NA NA NA NA NA NA NA
1
# of Inside
Elbows
Inside Feet of Straight Pipe
GUD115X**B Direct Vent Venting Table
Vent
Type
2
3
8
4
5
6
7
TABLE 3

14
VIII. Gas Piping
The rating plate is stamped with the model number, type of
gasandgasinputrating.Makesurethefurnaceisequipped
to operate on the type of gas available.
Inlet Gas Pressure
Natural Min. 5.0" W.C., Max. 10.0" W.C.
Propane Min. 11.0" W.C., Max. 13.0" W.C.
Inlet gas pressure must not exceed the maximum value
shown in table above.
The minimum supply pressure must be maintained to
prevent unreliable ignition. In addition, gas input to the
burners must not exceed the rated input shown on the
rating plate. Overfiring the furnace could result in prema-
ture heat exchanger failure.
High Altitude Derate (U.S. Installations Only)
When this furnace is installed at altitudes above 2,000 feet
above sea level the furnace input must be derated 4
percent for each 1,000 feet above sea level because the
density of the air is reduced.
In some areas the gas supplier will derate the gas at a rate
of 4% for each 1,000 feet above sea level. It this is not
done, smaller orifices will be required at altitudes above
3,500 feet (non-derated natural gas) or 4,500 feet (non-
derated propane gas).
A different pressure switch is required at altitudes more
than 4,000 feet above sea level. This is required regard-
less of the heat content of the fuel used.
High altitude kits are purchased according to the altitude
and usage of either propane gas or natural gas. Refer to
the Amana distributor for required high altitude kit(s).
Do not derate the furnace by adjusting the manifold pres-
sure to a lower pressure than specified on the furnace
nameplate. With a lower air density and a lower manifold
pressure at the burner orifice, the orifice will not supply the
proper amount of air into the burner, causing incomplete
combustion of the gas, flashback, and possible yellow
tipping.
GAS PIPING
ImportantNote:Toavoidpossibleunsatisfactoryoperation
or equipment damage due to underfiring of equipment, do
not undersize the natural/propane gas piping from the
meter/tankto thefurnace.Include allappliances which may
be operated simultaneously when 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
lengthof therun. Thegas lineinstallation mustcomplywith
localcodes,orintheabsenceoflocal codes,withthelatest
edition of the National Fuel Gas Code, NFPA 54/ANSI
Z223.1.
VII. Condensate Piping
Figure 12
Standpipe Assembly
TheAirCommand90and95achievesitshighefficiencyby
condensing some of the flue products into a slightly acidic
water which must be piped to a drain. A standpipe, which
is shipped with the furnace, must be installed on the right
side of the furnace cabinet (Figure 12). The condensate
from the recuperative coil and the induced draft blower
flowsintothis standpipe which actsasa trap. No other trap
may be used. A 3/4 inch PVC or CPVC pipe must be run
from the side of the standpipe to a drain, maintaining a
horizontaldownwardslopeinaccordancewithgoodplumb-
ing practices. Do not trap this line.
PVC or CPVC pipe is recommended since it is corrosion
resistant, rigid, and not easily damaged. The drain line
must not be routed outside where it could freeze and
become blocked. The top of the standpipe must be left
open so any blockage in the drainline will be relieved out
the tip of the standpipe and not back up into the unit.
If an air conditioning coil is installed with the furnace, a
common drain can be used (install as shown in Figure 13).
Leavingan open teenear the coolingcoil will allowpositive
airpressureinthesupply airplenumberelievedout thetee
withoutinterfering withdrainingof thefurnace condensate.
Figure 13
Common Drain Installation

15
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 = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
NATURAL GAS CONNECTION
RefertoFigure14forthegenerallayoutatthefurnace.The
following rules apply:
1. Use black iron or steel pipe and fittings for the building
piping.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
5. A 1/8 inch NPT pipe plug fitting, accessible for test
gage connection, must be installed immediately up-
stream of the gas supply connection to the furnace.
6.Usetwo pipewrencheswhenmakingconnectiontothe
gas valve to keep it from turning. The orientation of the
gas valve on the manifold must be the same as
shipped from the factory.
7. 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.
8. Tighten all joints securely.
9. The furnace must be connected to the building piping
by one of the following:
•Rigid metallic pipe and fittings.
•Semirigid metallic tubing and metallic fittings. Alumi-
num alloy tubing must not be used in exterior loca-
tions.
•Listed gas appliance connectors, used in accor-
dance with the terms of their listing, must be com-
pletely in the same room as the furnace.
•The connectors or semirigid tubing must be pro-
tected against physical and thermal damage when
installed.Aluminum-alloytubingandconnectorsmust
becoated toprotect againstexternalcorrosionwhen
in contact with masonry, plaster or insulation or are
subjecttorepeatedwettingsby suchliquids aswater
(except rain water), detergents or sewage.
Figure 14
General Furnace Layout
When the gas piping enters through the left side of the
furnace (Figure 15), the installer must supply the following
fittings (starting from the gas valve):
•90 degree elbow.
•1-1/2 inch close nipple.
•90 degree elbow.
•Straight pipe to reach exterior of furnace.
Figure 15
Gas Inlet Through Furnace Left Side
(Except GUD)
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 transition piece from 1/
2" to another pipe size.

16
When the gas piping enters through the right side of the
furnace (Figures 16 and 17) the installer must supply the
straight pipe to reach the exterior of the furnace.
Figure 16
Gas Inlet Through Furnace Right Side
(Except GUD)
Figure 17
Gas Inlet Through Furnace Right Side
(GUD Only)
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 transition piece from 1/
2 inch to another pipe size.
When the gas piping enters through the right side of the
furnace (Figure 18) the installer must supply the following
fittings (starting from the gas valve):
•90 degree elbow.
•1-1/2 inch close nipple.
•90 degree elbow.
•Straight pipe to reach exterior of furnace.
Figure 18
Gas Inlet Through Furnace Top Side
(GUD)
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 transition piece from 1/
2 inch to another pipe size.
GAS PIPING CHECKS
CAUTION
To prevent personal injury or property
damage due to fire, the following
instructions must be performed regarding
gasconnections,pressuretesting,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 explo-
sion 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, resulting in heat exchanger
failure.
• This unit and shutoff valve must be disconnected
from the gas supply piping system before supply
pipingsystempressure testing withtest pressures in
excess of 1/2 psig (3.48 kPa).
• This unit must be isolated from the gas supply
system by 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).

17
TANKS AND PIPING - PROPANE GAS UNITS
WARNING
To prevent death, personal injury or
property damage due to fire or explosion
causedbyapropanegasleak, installagas
detecting warning device. Since rust can
reducethe level ofodorant inpropane gas,
a gas detecting warning device is the only
reliable way to detect a propane gas leak.
Contactalocalpropanegassupplierabout
installing a gas detecting warning device.
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 appli-
ances in operation. Maintaining proper gas pressure de-
pends on three main factors:
1. Vaporization rate, depending on temperature of the
liquid, and “wetted surface” area of the container or
containers.
2. Proper pressure regulation. Two-stage regulation is
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.
Complete information regarding tank sizing for vaporiza-
tion, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
Since propane gas will quickly dissolve white lead or most
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
Propane Gas Installations (Typ.)
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 convert to capacities at 15 psig settings - multiply by 1.130
To convert to 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 injury
orpropertydamageduetofireorexplosion
causedbyapropanegasleak, installagas
detecting warning device.
If the propane gas furnace is installed in a
basement,anexcavatedarea or aconfined
space,a warning deviceis requireddue to:
• Propanegasisheavierthanairandany
leaking gas can settle in any low areas
or confined spaces.
• Propanegasodorantmayfade,making
the gas undetectable except with a
warning device.
If the presence of gas is suspected, follow
the instructions on Page 2 of this manual.

18
IX. Electrical Wiring
WARNING
Toavoid theriskof electricalshock, wiring
to the unit must be properly polarized and
grounded.
WARNING
To avoid electrical shock, injury or death,
disconnect electrical power before
changing any electrical wiring.
CAUTION
Labelallwirespriortodisconnectionwhen
servicingcontrols.Wiringerrorscancause
improper and dangerous operation. After
servicingiscompleted,alwaysverifyproper
operation.
The wiring harness on this unit is furnished as an integral
partof thefurnace. Fieldalterationtocomplywithelectrical
codes should not be required.
LINE VOLTAGE WIRING
Power supply to the furnace must be N.E.C. Class 1, and
must comply with all applicable codes. The furnace must
beelectricallygrounded inaccordancewiththelocalcodes
or, in their absence, with the latest edition of the National
Electrical Code, ANSI NFPA No. 70 and/or the CSA C22.1
Electrical Code. A fused disconnect should be provided
and sized in accordance with the unit maximum overcur-
rent protection.
The ground wire should run all the way back to the
electrical panel. To confirm proper grounding:
1. Disconnect electrical power.
2. Measure resistance between the neutral (white) con-
nection and one of the burners.
3. Resistance should be 10 ohms or less.
On all units except GUD models, line voltage wiring must
enterthroughthe left sideofthe furnace. On GUDmodels,
line voltage wiring must enter through the top or left side of
the furnace. Connect hot, neutral, and ground wires as
shown in the wiring diagram located on the blower door of
the unit. The ground screw is located inside the junction
box (Figure 20).
Ground
Screw
Line
Voltage
Connections
Figure 20
Field Wiring Connections - GUD
(Line Voltage)
(Shown with Junction Box Cover Removed For
Clarity Only)
LINE VOLTAGE CONNECTION FOR OPTIONAL
HUMIDIFIER AND ELECTRONIC AIR CLEANER
The control module in this furnace is equipped with line
voltage accessory terminals to be used for controlling the
power to an optional field-supplied humidifier and/or elec-
tronic air cleaner.
CAUTION
Labelallwirespriortodisconnectionwhen
servicingcontrols,wiringerrorscancause
improper and dangerous operation. Verify
proper operation after servicing.
ACCESSORY LOAD SPECIFICATIONS
Air Cleaner: 1.0 Amp maximum at 120 VAC
Humidifier: 1.0 Amp maximum at 120 VAC
ACCESSORY INSTALLATION
Follow the electronic air cleaner and humidifier manufac-
turers’ instructions for mounting and electrically grounding
these accessories. Check that the power supply to the
furnace has been disconnected. Wire the accessories to
the furnace control module as shown in Figure 21. All
connections to the control module are to be made through
1/4 (.250") receptacle (female) terminals.
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring must
comply with all local codes. This wiring must have a
minimum temperature rating of 105° C and must be routed
away from the burner compartment. All line voltage wire
splices must be made inside the furnace junction box.

19
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 21
Accessory Operation
Thefurnacecontrolmoduleenergizesthehumidifierwhen-
ever the induced draft blower is energized (if there is an
optional air cleaner on the system, the humidifier is not
energized until the air cleaner is energized). The control
module energizes the air cleaner whenever the air circula-
tion blower is energized.
LOW VOLTAGE WIRING
Low voltage wiring may enter through the right or left side
of the furnace. See Section II for hole locations. Run the
thermostat wires through either hole, up through a grom-
met in the blower deck, and to the ignition control module
(Figure 22).
CAUTION
To avoid possible equipment malfunction,
becareful to route the lowvoltage wiresso
as not to interfere with filter removal or
other maintenance.
Low voltage wires may then be connected to the terminal
strip as shown below.
Figure 22
Typical Field Wiring
(24 VAC Control Circuit)
Adjust the heat anticipator in the room thermostat to obtain
the proper number of heating cycles per hour. The heat
anticipator is a wire-wound adjustable heater that prevents
the room temperature from “overshooting” the room ther-
mostat setting. The heat anticipator must be set at 0.7
amps. The heat anticipator is part of the thermostat and if
it should fail for any reason, the thermostat must be
replaced.
A 40\/ transformer and auxiliary fan relay are built into the
furnace so that is may be used with most cooling equip-
ment.
Consult the wiring diagram for both 115V and 24V wiring
details. The wiring diagram is located inside the blower
compartment door.
X. 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 accordance
with the recommended methods of “Air Conditioning Con-
tractors of America” Manual D.
A duct system must be installed in accordance with Stan-
dards of the National Board of Fire Underwriters for the
Installation of Air Conditioning, Warm Air Heating and
Ventilating Systems. Pamphlets No. 90A and 90B.
The filter is designed for high velocity heating and cooling
applications.Filtersmustbeinspected,cleanedorchanged
every two months or as required. It is the owner's respon-
sibility to keep air filters clean. Note: Dirty filters are the
most common cause of inadequate heating or cooling
performance.
Guide dimples locate the bottom or side cutouts. Use a
straight edge to scribe lines connecting the dimples. Cut
out the opening on these lines. For bottom return air
connection, the bottom of the cabinet has to be removed
before the furnace is positioned on the raised platform or
set on top of the return air duct.
A closed return duct system must be used, with the return
duct sealed to the furnace casing. Supply and return duct
connections to the unit may be made with flexible joints to
minimize noise transmission. If a central return is used, a
connectingductmust be installedbetweenthe unit andthe
utility room wall so the furnace blower will not interfere with
combustion air or draft. The room, closet, or alcove must
not be used as a return air collecting 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 condensation in
the heating element. With a parallel flow arrangement, the
dampersorothermeansusedtocontroltheflowofairmust
be adequate to prevent chilled air from entering the fur-
nace 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
size that the heat exchanger can be viewed for visual light
inspection or such that a sampling probe can be inserted
into the air stream. The access panel must be made to
prevent air leaks when the furnace is in operation.

20
Timing Chart for Normal Integrated Ignition Control Operation
On
Off
Open
Closed
Closed
Open
On
Off
On
Off
On
Off
Seconds 0 17 20 23 53 0 5 60, 90, 120
or 180
Air Circulation
Blower
Gas Valve
Ignitor
Pressure Switch
Induced Draft Blower
Thermostat
Integrated Control
Diagnostic Light Signal Meanings
Light Signal Refer To "Abnormal Operation -
Inte
g
rated Control" Section
Continuous Light 1. Internal Control Failure
1 Flash 2. System Lockout
2 Flashes 3. Pressure Switch Stuck Closed
3 Flashes 4. Pressure Switch Stuck Open
4 Flashes 5. Open Limit Control
5 Flashes 6. Open Roll-Out Control
Continuous Flashing 7. Flame Sensed No Call For Heat
Timing Chart for Normal Cooling Operation
Seconds 0 5 0 45
Indoor Fan
Outdoor Fan
and
Compressor
Thermostat
On
Off
On
Off
On
Off