THIS FURNACE IS DESIGN CERTIFIED FOR
INSTALLATION IN BUILDINGS CONSTRUCTED ON
SITE ONLY.
CARBON MONOXIDE (REFERRED TO AS CO) CAN
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
WARNING
WARNING
WARNING
DO NOT USE THIS FURNACE IF ANY PART HAS
BEEN UNDER WATER. IMMEDIATELY CALL A
QUALIFIED SERVICE TECHNICIAN TO INSPECT
THE FURNACE AND TO REPLACE ANY PART OF
THE CONTROL SYSTEM AND ANY GAS CONTROL
THAT HAS BEEN UNDER WATER.
All information contained herein is subject to change without notice.
Goodman Manufacturing Company, L.P.
I0-213D2550 North Loop West, Suite 400, Houston, TX 77092 2/04
IF THIS FURNACE IS INSTALLED IN AN ENCLOSED
AREA, SUCH AS A GARAGE OR UTILITY ROOM,
EITHER ALONE OR WITH ANY OTHER CARBON
MONOXIDE PRODUCING DEVICE (E.G.
AUTOMOBILE, SPACE HEATER, WATER HEATER,
ETC.), ENSURE THAT THE ENCLOSED AREA IS
PROPERLY VENTILATED.
THIS FURNACE CONTAINS ELECTRONIC COMPONENTS,
WHICH REQUIRE A DEFINITE GROUND. PROVISIONS ARE
MADE FOR CONNECTION OF THE GROUND. A DEDICATED
GROUND FROM THE MAIN POWER SUPPLY OR AN EARTH
GROUND MUST BE PROVIDED.
REPLACEMENT PARTS
Replacement parts for this appliance are available through
your contractor or local distributor. For the location of your
nearest distributor consult the white business pages, the
yellow page section of the local telephone book or contact:
ELECTRICAL CONTROLS
Control board
Auxiliary / main limit switch
Roll-out switch
Transformer
Door interlock switch
Air pressure switch
Induced draft blower
BURNER ASSEMBLY
Burners
Manifold
Orifices
Gas Valve
Igniter
Flame sensor
MISCELLANEOUS
Wrapper
Access doors
Chimney
Gaskets and seals
Wiring assemblies
In order to effectively process the parts requirement the
distributor / contractor will need the entire model number
and serial number found on the series and rating plate
located inside the blower compartment.
CARBON MONOXIDE POISONING HAZARD
Special Warning for Installation of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Utility Rooms or Parking Areas
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unventilated garages, utility rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulting from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, utility room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
ventilation.
This ventilation is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device continues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain damage or death.
B10259-216
-
IO-213D2/04
2
WARNING
WHILE CARBON MONOXIDE DETECTORS DO PROVIDE
ADDITIONAL PROTECTION, LIMITATIONS TO THEIR
EFFECTIVENESS REQUIRE THAT YOU OTHERWISE
CONTINUE TO FOLLOW APPROPRIATE INSTRUCTIONS
LOCATED IN THE “INSTALLATION & OPERATING
INSTRUCTIONS” AND “USER’S INFORMATION MANUAL”
RELATING TO PROTECTING PERSONS FROM THE RISKS
OF CARBON MONOXIDE. REVIEW EACH CO DETECTOR’S
MANUFACTURERS’ EXPLANATION OF THEIR UNIT’S
CAPABILITIES AND FOLLOW THE INSTALLATION AND
OPERATING MANUAL WHEN INSTALLING AND
OPERATING SUCH UNITS.
WARNING
THE CIRCULATING AIR DUCTS MUST BE COMPLETELY
AND POSITIVELY SEALED TO PREVENT THE
COMBUSTION PRODUCTS, INCLUDING CARBON
MONOXIDE, FROM ENTERING THE LIVING SPACE.
WARNING
TO ENSURE PROPER INSTALLATION AND OPERATION OF
THIS PRODUCT, COMPLETELY READ AND UNDERSTAND
THESE INSTRUCTIONS PRIOR TO ATTEMPTING TO
ASSEMBLE, INSTALL, MAINTAIN, OR REPAIR. IF THESE
INSTRUCTIONS ARE NOT FOLLOWED PRECISELY THERE
IS A POTENTIAL OF CARBON MONOXIDE POISONING,
WHICH CAN RESULT IN SERIOUS ILLNESS OR DEATH.
WARNING
UNLESS ALLOWED BY LOCAL CODE, DO NOT INSTALL A
LIQUID PETROLEUM GAS BURNING APPLIANCE IN A PIT,
BASEMENT, OR SIMILAR LOCATION. L.P., A HEAVIER THAN
AIR GAS, CAN COLLECT IN LOW AREAS AND MAY NOT
DISPERSE NATURALLY. APPLIANCES SO FUELED SHALL
NOT BE INSTALLED IN AN ABOVE GRADE UNDER FLOOR
SPACE OR BASEMENT UNLESS SUCH LOCATION IS
PROVIDED WITH APPROVED MEANS FOR REMOVAL OF
UNBURNED GAS.
WARNING
THIS FURNACE WAS EQUIPPED AT THE FACTORY FOR
USE WITH NATURAL GAS ONLY. LIQUID PETROLEUM (L.P.)
CONVERSION, IF REQUIRED, MUST BE PERFORMED BY
A QUALIFIED TECHNICIAN FAMILIAR WITH PERFORMING
THIS TYPE OF CONVERSION. IF L.P. CONVERSION IS
REQUIRED, ALL INSTRUCTIONS INCLUDED WITH THE
FACTORY AUTHORIZED KIT MUST BE FOLLOWED. THE
ONLY KIT THAT MUST BE USED FOR THIS CONVERSION
IS THE FACTORY AUTHORIZED LPT-01. FAILURE TO
FOLLOW THOSE INSTRUCTIONS EXPLICITLY MAY CAUSE
FIRE, EXPLOSION, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
WARNING
NEVER LAY THIS FURNACE ON ITS FRONT OR REAR.
WARNING
HEATING UNIT SHOULD NOT BE UTILIZED WITHOUT
REASONABLE, ROUTINE, INSPECTION, MAINTENANCE
AND SUPERVISION. IF THE BUILDING IN WHICH ANY
SUCH DEVICE IS LOCATED WILL BE VACANT, CARE
SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY
INSPECTED, MAINTAINED AND MONITORED. IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO
FREEZING TEMPERATURES AND WILL BE VACANT, ALL
WATER-BEARING PIPES SHOULD BE DRAINED, THE
BUILDING SHOULD BE PROPERLY WINTERIZED, AND
THE WATER SOURCE CLOSED. IN THE EVENT THAT THE
BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT, ANY HYDRONIC
COIL UNITS SHOULD BE DRAINED AS WELL AND, IN SUCH
CASE, ALTERNATIVE HEAT SOURCES SHOULD BE
UTILIZED.
GENERAL INFORMATION
The GMNT series furnace can be installed as an upflow,
downflow or horizontal furnace. It can also be installed as a
direct vent or a non-direct vent furnace.
These Installation and Operating Instructions are intended
for use by fully qualified installation technicians. Some
localities require the installer/sevicer to be licensed. If in
doubt, check with local authorities.
INSTALLATION: In the USA, this furnace MUST be installed
in accordance with the latest edition of the ANSI Z223.1
booklet entitled “National Fuel Gas Code” (NFPA 54), and
the requirements or codes of the local utility or other authority
having jurisdiction. In Canada, this furnace must be installed
in accordance with the current CAN/CGA-B149.1 & 2 Gas
Installation Codes, local plumbing or waste water codes and
other applicable codes.
Additional helpful publications available from the NFPA are,
NFPA 90A - Installation of Air Conditioning and Ventilating
System and NFPA 90B - Warm Air Heating and Air
Conditioning System.
All venting shall be in accordance with PART 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI Z223.1, or
applicable local building and/or air conditioning codes.
These publications are available from:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
The GMNT series of furnaces meet the California NOx
emission standards and California seasonal efficiency
standards. ANNUAL inspections of the furnace and its vent
system is strongly recommended. It is the installer’s
responsibility to inform the user of this importance. Any
installation, alteration or repair of this equipment must not
be in violation of local code or the information contained in
this manual. This furnace shall be securely fastened in place
when installed in the vertical position. This furnace must be
installed in such a manner as to allow for service, inspection,
repair or replacement without removing permanent
construction. A platform is recommended to allow for service.
IO-213D 2/04
3
LOCATION
• DO NOT install this furnace in a mobile home. This furnace
is designed only for installation in buildings constructed
on site and connected to ductwork. When installed in a
utility room or closet, the door should be wide enough to
allow the largest part of the furnace to enter, or to permit
the replacement of another appliance, such as a water
heater. This furnace is designed to be installed indoors
only.
• DO NOT install outdoors. This furnace should be installed
in such a manner so that it is protected from water. If any
components should become wetted or submerged under
water, replace those parts before returning the furnace to
operation.
• DO NOT use as a construction heater.
• DO NOT use in an area where freezing may occur without
properly protecting the vent and drain system. The drain
may crack and leak if subjected to freezing temperatures.
• DO NOT install in a room used or designed to be used as
a bedroom, bathroom or storage closet, or in any enclosed
space with access only through such a room or space.
A return air filter grille or means of inserting a filter into the
return air duct is recommended. The opening in the duct
used for filter access must be capable of being sealed air
tight if located in the same pressure zone as the furnace.
The furnace and it’s individual shut-off must be disconnected
from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2
psig (3.5kPa)
The furnace must be isolated from the gas supply piping
system by closing it’s individual manual shut-off valve during
any pressure testing of the gas supply piping system at
pressures equal to or less than 1/2 psig (3.5 kPa).
CLEARANCES
MIN. CLEARANCES TO COMBUSTIBLE SURFACES
Unobstructed front clearance of 24" for servicing is
recommended.
RIGHT SIDE - 1" VENT - 0"
REAR - 0" LEFT SIDE - 1"
TOP OF PLENUM - 1" FRONT - 3"
Line contact is permitted in the horizontal position.
ACCESSIBILITY CLEARANCE, WHERE GREATER,
SHOULD TAKE PRECEDENCE OVER MINIMUM FIRE
PROTECTION CLEARANCE.
A gas-fired furnace for installation in a residential garage
must be installed so that the ignition source and burners
are located not less than eighteen inches (18") above the
floor and is protected or located to prevent physical damage
by vehicles.
A gas furnace must not be installed directly on carpeting,
tile, or other combustible materials other than wood flooring.
WARNING
A SOLID METAL BASEPLATE IS SUPPLIED WITH THIS
FURNACE. THIS BASEPLATE MUST BE IN PLACE AND
SEALED AIR TIGHT WHEN THE FURNACE IS INSTALLED
WITH SIDE RETURN AIR DUCTS. FAILURE TO DO SO
MAY PERMIT COMBUSTION PRODUCTS, INCLUDING
CABON MONOXIDE, TO ENTER THE LIVING SPACE AND
CREATE POTENTIALLY HAZARDOUS CONDITIONS SUCH
AS CARBON MONOXIDE POISONING OR DEATH. FULL
SIZE RETURN AIR DUCT OPENINGS MUST BE UTILIZED.
EMBOSSES ARE PROVIDED FOR THIS PURPOSE.
Before proceeding with this installation check the following:
• Correct clearance from combustible materials
• Adequate accessibility for servicing
• Flooring is not carpet or any other combustible material,
except wood
• Adequate combustion / ventilation air is supplied
• Metal base plate is in place when using side(s) for return
air
• In a garage, the furnace has been adequately elevated
and protected from vehicle damage
• Furnace area is free of flammable materials and vapors
such as gasoline
COMBUSTION AIR
The GMNT furnace can be installed either as a Direct Vent
(2 pipe) or a Non-Direct Vent (1 pipe) appliance. If installed
as direct vent appliance, the combustion air is to be taken
from the outdoors via a 2" or 3" schedule 40 PVC pipe and
terminate at the furnace burner box. As a non-direct vent
furnace, the combustion air is taken from the area which
the furnace is installed. Avoid combustion air sources that
contain flammable fumes and vapors, and gasses such as
carbon monoxide, hydrogen sulfide, ammonia, chlorine, and
halogenated hydrocarbons.
Direct Vent Combustion Air. As shown in the following
illustration, the combustion air pipe is to originate at the
furnace’s cabinet and terminate outside of the building. The
diameter of the PVC combustion air pipe depends upon
the furnace size, the length of pipe, and the quantity of
fittings employed. The table found in the “Combustion/Vent
Pipe Size” section of this manual outlines these sizing
requirements. As a direct vent installation, the “Air for
Combustion and Ventilation Air” requirements found in ANSI
Z223.1, section 5.3 is not required for the furnace to operate
correctly. However, other fuel burning appliances located
in the same space as the furnace may still require that the
area be serviced with Combustion and Ventilation Air
consistent with ANSI Z223.1, section 5.3.
WARNING
COMBUSTIBLE MATERIAL MUST NOT BE PLACED ON OR
AGAINST THE FURNACE CABINET. THE AREA AROUND
THE FURNACE MUST BE KEPT CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIAL INCLUDING GASOLINE AND
OTHER FLAMMABLE VAPORS AND LIQUIDS. THE USER
MUST BE CAUTIONED THAT THE FURNACE AREA MUST
NOT BE USED AS A BROOM CLOSET OR FOR ANY OTHER
STORAGE PURPOSE.
IO-213D2/04
4
Attaching Combustion Air Intake Fitting. A coupling for
attaching the combustion air fitting to the furnace cabinet
is included in a plastic bag packaged with the furnace. The
fitting is sized to accept a 3" diameter PVC pipe. In certain
situation, a 2" diameter pipe can be used for this application.
Refer to the combustion/ vent table for sizing requirements.
Attach the fitting to the cabinet using (4) #10 x 1/2" sheet
metal screws (field supplied). If a right hand entrance is
preferred, the plug installed on this side is to be removed
and reinstalled in the left side opening.
Non-Direct Vent Combustion Air. If the furnace is to be
installed as a non-direct vent appliance, the combustion air
pipe outlined previously is not used.
As a non-direct vent furnace, this must be installed in
accordance with the combustion and ventilation air
requirements found in ANSI Z221.3, section 5.3. When
installed as a non-direct vent furnace in an area, which is
deemed as a confined area, see (ANSI Z223.1, section 1.7,
“Space, Confined”) the requirements are as follows:
All Combustion Air Taken From The Inside Of The
Building. When installed as a non-direct vent furnace and
indoor air is used as the combustion air source, the space
is to be provided with (2) permanent openings communicating
directly with an additional room(s) of sufficient volume so
that the combined volume of all spaces meets the criteria of
an unconfined area. The total input of all gas burning
equipment shall be used to determine the minimum size of
each opening. Each opening shall be sized to be a minimum
of 1 square inch of free area per 1,000 Btu/hr of combined
input of gas utilization equipment in the area. The minimum
area for each opening shall not be less than 100 square
inches, and the minimum dimension of these openings shall
not be less than 3 inches. One opening shall commence
within 12 inches of the top of the area, while the other opening
shall commence within 12 inches of the bottom of the area.
All Combustion Air Taken From Outdoors. If installed
as a non-direct furnace and outdoor air is selected as the
combustion air source, then area shall be serviced with an
opening(s) communicating directly with the outdoors by either
of the following two methods. When calculating the minimum
area for each opening, the combined input of all gas utilization
equipment is to be considered. Also, the minimum
dimension for any opening shall not be less than 3 inches.
Method 1..... Two permanent openings communicating
directly with the outdoors via. horizontal ducts shall be
sized to be a minimum of 1 square inch per 4,000 Btu/hr
or, two permanent openings communicating directly with
the outdoors via. vertical ducts shall be sized to be a
minimum of 1 square inch per 2,000 Btu /hr.
Method 2..... One permanent opening communicating
directly with the outdoors via a horizontal duct. This
opening/duct shall be sized to be equal to 1 square inch
per 3,000 Btu / hr, but not less than the sum of the areas
all of the vent connectors in the confined space.
When installed as a direct vent furnace and NOT using the
concentric vent kit CVK-00 option, the combustion air is to
be terminated in the following manner;
OPTIONAL
INLET
SCREEN
COMBUSTION
AIR INTAKE
If the optional concentric vent kit (CVK-00) is used, follow
the instructions provided with this accessory.
SOURCE OF COMBUSTION AIR
The recommended source of combustion air is to use the
outdoor air supply. However, the use of indoor air in most
applications is acceptable except as follows;
1. If the furnace is installed in a confined space, the
necessary combustion must come from outdoors by
way of the attic, crawl space, or direct opening to the
outside.
2. If indoor combustion is used, there must be no exposure
to the substances listed in #3 below.
3. The following installations may require OUTDOOR AIR
for combustion, due to chemical exposures;
• Commercial buildings
• Buildings with indoor pools
• Furnaces installed in laundry rooms
• Furnaces installed in hobby or craft rooms
• Furnaces installed near chemical storage areas
Exposures to the following substances in the combustion
air supply may also require OUTDOOR AIR for combustion;
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as perchloroethylene)
• Printing inks, paint removers, varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes dryers
• Masonry acid washing materials
VENTING
ANNUAL inspections of the furnace and it’s vent / combustion
air supply is strongly recommended. It is the contractor’s
responsibility to inform the user of this importance. All venting
shall be in accordance with Part 7; Venting of Equipment,
of the National Fuel Gas Code, ANSI Z223.1, or applicable
local building and/ or air conditioning codes.
PROPER INSTALLATION OF THE VENT / COMBUSTION AIR
SYSTEMS IS CRITICAL TO SAFE OPERATION OF THIS
APPLIANCE. CAREFULLY READ AND UNDERSTAND THE
INSTRUCTIONS IN THIS SECTION. EACH VENT AND
COMBUSTION AIR SUPPLY PIPE MUST SERVE ONLY ONE
IO-213D 2/04
5
APPLIANCE. DO NOT CONNECT TO AN EXISTING VENT OR
CHIMNEY UNLESS IT CONFORMS TO ALL PROVISIONS IN
THIS INSTRUCTION BOOKLET. THE VENT MUST TERMINATE
OUTDOORS.
VENT/COMBUSTION AIR SUPPLY PIPE LENGTHS
Elbows must be long radius types. (Quarter bends or DWV).
The maximum length of the vent pipe and the combustion
air supply pipe is 100 feet each.
Model Vent @ Vent @ more Comb. Air @ Comb. Air @
GMNT45 ft.than 45 ft. More than 45
040-32 in.3 in.2”3”
060-32 in.3 in.2”3”
080-43 in.3 in.3”3”
100-43 in.3 in.3”3”
120-53 in.3 in.3”3”
or less45 ft.or less
45 ft.
Chart assumes a maximum of 4 - 90° elbows. For excess
of 4 elbows decrease length by 7.5 ft. per elbow. A
maximum of 6 elbows is acceptable. The use of two 45°
over one 90° is preferred. Do not count the termination as
an elbow.
Minimum vent length is 6 ft. for vertical and horizontal runs.
There is no minimum combustion air supply pipe length.
These furnaces are a condensing type appliance. The
products of combustion are recirculated through a secondary
coil. During this process the flue products are brought to a
point below dew point. Thus the moisture present in the
flue products condenses leaving a liquid by-product. This
by-product must be removed from the furnace and it’s
collection system.
In addition, the vent temperatures are also considerably lower
than conventional furnaces. This allows the use of low
temperature plastic as the vent system. The recommended
plastic is schedule 40 PVC, ABS, DWV (or equivalent if
allowed by local code). See the previous chart for proper
sizing. The use of two 45° elbows is suggested over the use
of a single 90° elbow. The vent pipe must slope toward the
furnace to properly drain the condensate. The drain trap and
related parts must be installed as shown in the illustrations.
Failure to follow these instructions can cause products of
combustion including CARBON MONOXIDE entering the
dwelling.
IF THIS FURNACE IS INSTALLED IN AN ATTIC OR SIMILAR
AREA WHERE CONDENSATE OVERFLOW MAY BE A PROBLEM,
AN AUXILIARY DRAIN PAN MUST BE INSTALLED UNDER THE
FURNACE WITH THE AUXILIARY DRAIN LINES ROUTED TO
THE OUTDOORS TO PREVENT WATER DAMAGE CAUSED
BY LEAKS.
THE COMBUSTION PRODUCTS AND MOISTURE IN THE
FLUE GASES WILL CONDENSE. THE CONDENSATE MAY
FREEZE ON THE EXTERIOR WALL AND SURROUNDING
SURFACES. SOME DISCOLORATION OR ETCHING IS TO BE
EXPECTED.
THE VENT AND COMBUSTION AIR SUPPLY PIPES MUST
BE INSPECTED ANNUALLY.
Visually check the vent terminal and combustion air supply
pipe screens, clean if necessary. Visually check for
blockage of the condensate disposal system. Hoses may
be disconnected to determine that proper flow is maintained.
Should an obstruction be observed, it can be dislodged by
forcing a stream of water through it using a device such as
a garden hose.
Materials and procedures must conform to:
The ASTM Standards.
Pipe and Fittings ASTM 1785, D2465 and D2266
PVC Primer and Solvent Cement ASTM D2564
Procedure for Cementing Joints ASTM D2855 (ref.) This
appliance may be vertically or horizontally vented.
HORIZONTAL THROUGH THE WALL VENTING
This appliance may be horizontally vented through an exterior
wall following the applicable instructions in the “VENTING”
section in conjunction with these additional requirements.
A wall sleeve must be used.
ALL HORIZONTAL VENT INSTALLATIONS MUST BE MADE
IN ACCORDANCE WITH THESE INSTRUCTIONS.
When selecting which exterior wall to penetrate, the following
items should be taken into consideration:
1. Layout the combustion air and vent system to avoid the
possibility of interference with beams, poles, posts,
electrical wiring, plumbing, etc.
2. When possible, the combustion air and vent termination
should not be subjected to prevailing winds.
3. The combustion air intake and vent termination must
be located at least twelve (12) inches above expected
snowfall. Consideration should be made to past unusual
snowfalls.
• DO NOT locate the terminal less than seven (7) feet above
public walkways. This applies to steps and stairwells.
• DO NOT locate the termination areas where condensate
may present a problem such as flowerbeds, patios, etc.
• DO NOT locate within four (4) feet of a gas meter, electric
meter, or gas regulator; (3) feet in Canada
• DO NOT locate the vent terminal within four (4) feet of an
adjacent building.
• DIRECT VENT INSTALLATION - DO NOT locate the vent
terminal within twelve (12) inches of an operable window
or door.
• NON-DIRECT VENT INSTALLATION - DO NOT locate the
vent terminal less than (12) inches above a door or
operable window.
• NON-DIRECT VENT INSTALLATION - DO NOT locate the
vent terminal less than (4) feet below or (4) feet horizontally
from any door, window or gravity air inlet into any building.
• DO NOT locate the vent terminal less than three (3) feet
above, or (10) feet horizontally from, a forced air inlet into
any building, other than the combustion air supply pipe.
• DO NOT locate the vent terminal within three (3) feet of an
inside corner of a building or structure. Minor corners
created by fireplace chimneys are excluded from this
requirement.
To protect the exterior surface from staining due to the
condensate, an aluminum plate or similar material may be
installed surrounding the termination. This plate should
extend approximately two (2) feet from the termination.
IO-213D2/04
6
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