Heat Controller GMUH75-E4A, GMUH50-E3A, GMUH75-E3A, GMUH100-E3A, GMUH100-E4A Installation Instructions Manual
...
HEAT CONTROLLER
INSTALLATION INSTRUCTIONS
FOR INDUCED DRAFT GAS FURNACES
GMUH UPFLOW/HORIZONTAL SERIES
GMDA DOWNFLOW SERIES
Upflow/Horizontal Models Downflow Models
Model Number Input (Btu) Tons Model Number Input (Btu) Tons
GMUH50-E3A 50,000 3 GMDA50-E3A 50,000 3
GMUH75-E3A 75,000 3 GMDA75-E4A 75,000 4
GMUH75-E4A 75,000 4 GMDA75-E3A 75,000 3
GMUH100-E3A 100,000 3 GMDA100-E3A 100,000 3
GMUH100-E4A 100,000 4 GMDA100-E5A 100,000 5
GMUH100-E5A 100,000 5 GMDA125-E5A 125,000 5
GMUH125-E5A 125,000 5 GMDA150-E5A 150,000 5
GMUH150-E5A 150,000 5
U.L. recognized fuel gas and CO (carbon monoxide) detectors are recommended in all
applications, and their installation should be in accordance with the manufacturer’s
recommendations and/or local laws, rules, regulations, or customs.
SUPERSEDES 92-24161-65-01
92-24161-65-02
Before beginning any troubleshooting procedure, complete the following installation checklist. A furnace malfunction is
sometimes caused by an improper installation. By completing this checklist, the problem may be found and corrected. Make
copies of the checklist and complete one for every Low Profile Furnace service call for your records.
INSTALLATION CHECKLIST
(Refer to this manual for specifics.)
AS SUPPLY
G
Adequate pipe size
No gas leaks
Proper supply and manifold gas pressure (check with an accurate U-tube manometer with the furnace and all other gas
appliances operating.)
LECTRICAL
E
Correct thermostat and subbase Thermostat model Subbase model
Correct thermostat mode and setting
Correct line supply voltage
Correct power supply polarity is required with electronic ignition
Correct furnace ground to electrical panel
DC microamp (µA) flame signal (hot surface ignition units)
Correct control voltage
Measure and set heat anticipator amperage
Air conditioning low voltage wires connected to terminals “Y” “C” - not with wire nuts
VENTING
Correct vent pipe diameter and length (according to CSA tables) Vent connection size
Correct venting material (according to CSA tables)
Correct lining for masonry chimneys
Adequate clearance from combustibles
Proper negative pressure reading in the vent
Vent pipe secured to induced draft blower housing
COMBUSTION AIR
Proper source of combustion air
Correct combustion air opening size
Optional attic combustion air pull
Non-attic combustion air pull
FURNACE INSTALLATION
Adequate clearance from combustibles
Adequate clearance for service
Proper air temperature rise (See furnace rating plate)
External static pressure inches w.c.
Correct filter(s)
Correct cooling coil or accessories (if equipped)
Adequate supply and return air ducting Return Air Duct Size Supply Air Duct Size
Air ducts sealed to prevent leakage
2
Important: All manufacturer products
meet current Federal OSHA Guidelines
for safety. California Proposition 65
warnings are required for certain
products, which are not covered by the
OSHA standards.
California's Proposition 65 requires
arnings for products sold in California
w
that contain, or produce, any of over
600 listed chemicals known to the State
f California to cause cancer or birth
o
defects such as fiberglass insulation,
lead in brass, and combustion products
rom natural gas.
f
All “new equipment” shipped for sale in
California will have labels stating that
the product contains and/or produces
Proposition 65 chemicals. Although we
have not changed our processes,
having the same label on all our
products facilitates manufacturing and
shipping. We cannot always know
“when, or if” products will be sold in the
California market.
You may receive inquiries from
customers about chemicals found in, or
produced by, some of our heating and
air-conditioning equipment, or found in
natural gas used with some of our
products. Listed below are those
chemicals and substances commonly
associated with similar equipment in
our industry and other manufacturers.
• Glass Wool (Fiberglass) Insulation
• Carbon Monoxide (CO)
• Formaldehyde
• Benzene
More details are available at the
Websites for OSHA (Occupational
Safety and Health Administration), at
www.osha.gov
California's OEHHA (Office of
Environmental Health Hazard
Assessment), at www.oehha.org.
Consumer education is important since
the chemicals and substances on the
list are found in our daily lives. Most
consumers are aware that products
present safety and health risks, when
improperly used, handled and
maintained.
and the State of
CONTENTS
nstallation Check List ............................................................................................2
I
Safety Information ..................................................................................................4
General Information ...............................................................................................8
Location Requirements and Considerations ..........................................................9
Combustion and Ventilation Air............................................................................14
Vent Pipe Installation ...........................................................................................18
Gas Supply and Piping ........................................................................................21
Electrical Wiring ...................................................................................................25
Thermostat...........................................................................................................25
Accessories..........................................................................................................26
Furnace Twinning ................................................................................................26
High Altitude Installations.....................................................................................27
Start-Up Procedure ..............................................................................................30
Air Flow ................................................................................................................32
Blower Performance Data ....................................................................................33
Safety Features....................................................................................................34
Maintenance ........................................................................................................35
Troubleshooting ...................................................................................................38
Wiring Diagram ....................................................................................................39
IMPORTANT: TO INSURE PROPER INSTALLATION AND OPERATION OF
THIS PRODUCT, COMPLETELY READ ALL INSTRUCTIONS PRIOR TO
ATTEMPTING TO ASSEMBLE, INSTALL, OPERATE, MAINTAIN OR REPAIR
THIS PRODUCT. UPON UNPACKING OF THE FURNACE, INSPECT ALL
PARTS FOR DAMAGE PRIOR TO INSTALLATION AND START-UP.
33
SAFETY INFORMATION
WARNING
!
IF THE INFORMATION IN THESE
INSTRUCTIONS IS NOT
OLLOWED EXACTLY, A FIRE OR
F
EXPLOSION MAY RESULT,
CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
WARNING
!
THESE INSTRUCTIONS ARE
INTENDED AS AN AID TO
QUALIFIED SERVICE PERSONNEL
FOR PROPER INSTALLATION,
ADJUSTMENT AND OPERATION
OF THIS UNIT. READ THESE
INSTRUCTIONS THOROUGHLY
BEFORE ATTEMPTING
INSTALLATION OR OPERATION.
FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN
IMPROPER INSTALLATION,
ADJUSTMENT, SERVICE OR
MAINTENANCE, POSSIBLY
RESULTING IN FIRE, ELECTRICAL
SHOCK, CARBON MONOXIDE
POISONING, EXPLOSION,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
WARNING
!
PROPOSITION 65 WARNING: THIS
PRODUCT CONTAINS CHEMICALS
KNOWN TO THE STATE OF
CALIFORNIA TO CAUSE CANCER,
BIRTH DEFECTS OR OTHER
REPRODUCTIVE HARM.
WARNING
!
USE ONLY WITH TYPE OF GAS
APPROVED FOR THIS FURNACE.
REFER TO THE FURNACE RATING
PLATE.
WARNING
!
INSTALL THIS FURNACE ONLY IN
A LOCATION AND POSITION AS
SPECIFIED IN THE LOCATION
REQUIREMENTS AND
CONSIDERATIONS SECTION OF
THESE INSTRUCTIONS.
WARNING
!
Do not store or use gasoline or other
—
flammable vapors and liquids, or
ther combustible materials in the
o
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
building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
as supplier’s instructions.
g
• If you cannot reach your gas
supplier, call the fire department.
• Do not return to your home until
authorized by the gas supplier or fire
department.
—DO NOT RELY ON SMELL ALONE TO
DETECT LEAKS. DUE TO VARIOUS
FACTORS, YOU MAY NOT BE ABLE
TO SMELL FUEL GASES.
• U.L. recognized fuel gas and CO
(carbon monoxide) detectors are
recommended in all applications,
and their installation should be in
accordance with the manufacturer’s
recommendations and/or local laws,
rules, regulations, or customs.
— Improper installation, adjustment,
alteration, service or maintenance can
cause injury, property damage or
death. Refer to this manual.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier. In
the commonwealth of Massachusetts,
installation must be performed by a
licensed plumber or gas fitter for
appropriate fuel.
WARNING
!
PROVIDE ADEQUATE
COMBUSTION AND VENTILATION
AIR TO THE FURNACE SPACE AS
SPECIFIED IN THE VENTING
SECTION OF THESE
INSTRUCTIONS.
WARNING
!
COMBUSTION PRODUCTS MUST
BE DISCHARGED OUTDOORS.
CONNECT THIS FURNACE TO AN
APPROVED VENT SYSTEM ONLY,
AS SPECIFIED IN VENT PIPE
NSTALLATION SECTION OF
I
THESE INSTRUCTIONS.
WARNING
!
THE MANUFACTURER IS NOT
RESPONSIBLE FOR EQUIPMENT
THAT IS MISMATCHED OR
IMPROPERLY INSTALLED.
WARNING
!
NEVER TEST FOR GAS LEAKS
WITH AN OPEN FLAME. USE A
COMMERCIALLY AVAILABLE
SOAP SOLUTION MADE
SPECIFICALLY FOR THE
DETECTION OF LEAKS TO CHECK
ALL CONNECTIONS, AS
SPECIFIED IN GAS SUPPLY AND
PIPING SECTION OF THESE
INSTRUCTIONS.
WARNING
!
ALWAYS INSTALL FURNACE TO
OPERATE WITHIN THE
FURNACE'S INTENDED
TEMPERATURE-RISE RANGE
WITH A DUCT SYSTEM WHICH
HAS AN EXTERNAL STATIC
PRESSURE WITHIN THE
ALLOWABLE RANGE, AS
SPECIFIED IN DUCTING SECTION
OF THESE INSTRUCTIONS. SEE
ALSO FURNACE RATING
WARNING
!
WHEN A FURNACE IS INSTALLED
SO THAT SUPPLY DUCTS CARRY
AIR CIRCULATED BY THE
FURNACE TO AREAS OUTSIDE
THE SPACE CONTAINING THE
FURNACE, THE RETURN AIR
SHALL ALSO BE HANDLED BY
DUCT(S) SEALED TO THE
FURNACE CASING AND
TERMINATING OUTSIDE THE
SPACE CONTAINING THE
FURNACE.
4
WARNING
!
WHEN THIS FURNACE IS
INSTALLED IN A RESIDENTIAL
GARAGE, IT MUST BE INSTALLED
SO THE BURNERS AND IGNITION
OURCE ARE LOCATED NO LESS
S
THAN 18 INCHES ABOVE THE
FLOOR. THIS IS TO REDUCE THE
RISK OF IGNITING FLAMMABLE
VAPORS WHICH MAY
BE PRESENT IN A GARAGE.
ALSO, THE FURNACE MUST BE
LOCATED OR PROTECTED TO
AVOID PHYSICAL DAMAGE BY
EHICLES. FAILURE TO FOLLOW
V
THESE WARNINGS CAN CAUSE A
FIRE OR EXPLOSION, RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
WARNING
!
USE OF THIS FURNACE IS
ALLOWED DURING
CONSTRUCTION IF THE
FOLLOWING TEMPORARY
INSTALLATION REQUIREMENTS
ARE MET. INSTALLATION MUST
COMPLY WITH ALL INSTALLATION
INSTRUCTIONS INCLUDING:
• PROPER VENT INSTALLATION;
• FURNACE OPERATING UNDER
THERMOSTATIC CONTROL;
• RETURN AIR DUCT SEALED TO
THE FURNACE;
• AIR FILTERS IN PLACE;
• SET FURNACE INPUT RATE AND
TEMPERATURE RISE PER
RATING PLATE MARKING;
• MEANS FOR PROVIDING
OUTDOOR AIR REQUIRED FOR
COMBUSTION;
• RETURN AIR TEMPERATURE
MAINTAINED BETWEEN 55°F
(13°C) AND 80°F (27°C); AND
• CLEAN FURNACE, DUCT WORK
AND COMPONENTS UPON
SUBSTANTIAL COMPLETION OF
THE CONSTRUCTION
PROCESS, AND VERIFY
FURNACE OPERATING
CONDITIONS INCLUDING
IGNITION, INPUT RATE,
TEMPERATURE RISE AND
VENTING, ACCORDING TO THE
INSTRUCTIONS.
WARNING
!
DUCT LEAKS CAN CREATE AN
UNBALANCED SYSTEM AND DRAW
POLLUTANTS SUCH AS DIRT, DUST,
FUMES AND ODORS INTO THE
HOME CAUSING PROPERTY
DAMAGE. FUMES AND ODORS
ROM TOXIC, VOLATILE OR
F
FLAMMABLE CHEMICALS, AS WELL
AS AUTOMOBILE EXHAUST AND
CARBON MONOXIDE (CO), CAN BE
DRAWN INTO THE LIVING SPACE
THROUGH LEAKING DUCTS AND
UNBALANCED DUCT SYSTEMS
CAUSING PERSONAL INJURY OR
DEATH (SEE FIGURE 1).
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
GARAGES OR OFF-GARAGE
STORAGE AREAS - ALL JOINTS,
SEAMS, AND OPENINGS IN THE
EQUIPMENT AND DUCT MUST BE
SEALED TO LIMIT THE MIGRATION
OF TOXIC FUMES AND ODORS
INCLUDING CARBON MONOXIDE
FROM MIGRATING INTO THE
LIVING SPACE.
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
SPACES CONTAINING FUEL
BURNING APPLIANCES SUCH AS
WATER HEATERS OR BOILERS ALL JOINTS, SEAMS, AND
OPENINGS IN THE EQUIPMENT
AND DUCT MUST ALSO BE
SEALED TO PREVENT
DEPRESSURIZATION OF THE
SPACE AND POSSIBLE
MIGRATION OF COMBUSTION
BYPRODUCTS INCLUDING
CARBON MONOXIDE INTO THE
LIVING SPACE.
WARNING
!
THIS FURNACE IS NOT APPROVED
FOR INSTALLATION IN A MOBILE
HOME. DO NOT INSTALL THIS
FURNACE IN A MOBILE HOME.
INSTALLATION IN A MOBILE HOME
COULD CAUSE FIRE, PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
WARNING
!
UPFLOW AND HORIZONTAL
FURNACES MUST NOT BE
INSTALLED DIRECTLY ON
CARPETING, TILE OR OTHER
COMBUSTIBLE MATERIAL OTHER
THAN WOOD FLOORING.
INSTALLATION ON A COMBUSTIBLE
MATERIAL CAN RESULT IN FIRE
CAUSING PROPERTY DAMAGE,
SEVERE PERSONAL INJURY OR
DEATH.
WARNING
!
DOWNFLOW UNIT DESIGN IS
CERTIFIED FOR INSTALLATION ON
NON-COMBUSTIBLE FLOOR. A
SPECIAL COMBUSTIBLE FLOOR
SUB-BASE IS REQUIRED WHEN
INSTALLING ON A COMBUSTIBLE
FLOOR. FAILURE TO INSTALL THE
SUB-BASE MAY RESULT IN FIRE,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH. THIS SPECIAL
BASE IS OFFERED AS AN
ACCESSORY FROM THE FACTORY.
SEE THE CLEARANCE LABEL
LOCATED INSIDE THE FURNACE
FOR THE APPROPRIATE MODEL
NUMBER.
THE SPECIAL BASE IS NOT
REQUIRED WHEN THE FURNACE IS
INSTALLED ON TOP OF AN AIR
CONDITIONING PLENUM.
CAUTION
!
WHEN COILS ARE USED WITH AIR
HANDLERS OR FURNACES AND
INSTALLED ABOVE A FINISHED
CEILING OR LIVING AREA, IT IS
RECOMMENDED THAT AN
AUXILIARY SHEET METAL
CONDENSATE DRAIN PAN BE
FABRICATED AND INSTALLED
UNDER ENTIRE UNIT. FAILURE TO
DO SO CAN RESULT IN PROPERTY
DAMAGE. RUN CONDENSATE TO A
LOCATION WHERE IT IS
NOTICEABLE.
WARNING
!
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA
AROUND THE FURNACE MUST BE
KEPT CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIALS
INCLUDING GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR
FOR ANY OTHER STORAGE
PURPOSES.
5
WARNING
!
EVER ALLOW PRODUCTS OF
N
OMBUSTION OR THE FLUE
C
RODUCTS TO ENTER THE
P
ETURN AIR DUCTWORK, OR THE
R
IRCULATING AIR SUPPLY. ALL
C
ETURN DUCTWORK MUST BE
R
DEQUATELY SEALED AND
A
ECURED TO THE FURNACE WITH
S
HEET METAL SCREWS, AND
S
OINTS TAPED. WHEN A FURNACE
J
S MOUNTED ON A PLATFORM,
I
ITH RETURN THROUGH THE
W
OTTOM, IT MUST BE SEALED
B
IRTIGHT BETWEEN THE FURNACE
A
ND THE RETURN AIR PLENUM.
A
HE RETURN AIR PLENUM MUST BE
T
ERMANENTLY ENCLOSED. NEVER
P
USE A DOOR AS A PART OF THE
RETURN AIR PLENUM. THE FLOOR
OR PLATFORM MUST PROVIDE
SOUND PHYSICAL SUPPORT OF
THE FURNACE, WITHOUT SAGGING,
CRACKS, GAPS, ETC., AROUND THE
BASE AS TO PROVIDE A SEAL
BETWEEN THE SUPPORT AND THE
BASE.
FAILURE TO PREVENT PRODUCTS
OF COMBUSTION FROM BEING
CIRCULATED INTO THE LIVING
SPACE CAN CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING THAT COULD RESULT
IN PERSONAL INJURY OR DEATH.
DO NOT, UNDER ANY
CIRCUMSTANCES, CONNECT
RETURN OR SUPPLY DUCTWORK
TO OR FROM ANY OTHER HEAT
PRODUCING DEVICE SUCH AS A
FIREPLACE INSERT, STOVE, ETC.
DOING SO MAY RESULT IN FIRE,
CARBON MONOXIDE POISONING,
EXPLOSION, PERSONAL INJURY OR
PROPERTY DAMAGE.
WARNING
!
THE DOWNFLOW FURNACE
DESIGN IS CERTIFIED FOR
INSTALLATION ON A NONCOMBUSTIBLE FLOOR. IF
INSTALLED ON A COMBUSTIBLE
FLOOR, USE THE SPECIAL BASE
SPECIFIED ON THE FURNACE
CLEARANCE LABEL. FAILURE TO
INSTALL THE SPECIAL BASE MAY
RESULT IN FIRE, PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THIS SPECIAL BASE IS
SHIPPED FROM THE FACTORY AS
AN ACCESSORY.
WARNING
!
THIS FURNACE AND ANY OTHER
FUEL-BURNING APPLIANCE MUST
BE PROVIDED WITH ENOUGH
FRESH AIR FOR PROPER
COMBUSTION AND VENTILATION
OF THE FLUE GASES. MOST
HOMES WILL REQUIRE THAT
OUTSIDE AIR BE SUPPLIED INTO
THE FURNACE AREA. FAILURE TO
DO SO CAN CAUSE DEATH FROM
CARBON MONOXIDE POISONING.
WARNING
!
ALL FURNACE INSTALLATIONS
MUST COMPLY WITH THE
NATIONAL FUEL GAS CODE AND
LOCAL CODES TO PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR FOR THE
FURNACE. FAILURE TO DO SO CAN
CREATE HAZARDOUS CONDITIONS
RESULTING IN PROPERTY
DAMAGE, BODILY INJURY OR
DEATH FROM SMOKE, FIRE OR
CARBON MONOXIDE.
WARNING
!
DEVICES ATTACHED TO THE FLUE
OR VENT FOR THE PURPOSE OF
REDUCING HEAT LOSS UP THE
CHIMNEY HAVE NOT BEEN TESTED
AND HAVE NOT BEEN INCLUDED IN
THE DESIGN CERTIFICATION OF
THIS FURNACE. WE, THE
MANUFACTURER, CANNOT AND
WILL NOT BE RESPONSIBLE FOR
INJURY OR DAMAGE CAUSED BY
THE USE OF SUCH UNTESTED
AND/OR UNCERTIFIED DEVICES,
ACCESSORIES OR COMPONENTS.
WARNING
!
VENT PIPE ATTACHING HOLES
MUST BE PREDRILLED IN THE
DRAFT INDUCER COLLAR TO
PREVENT DAMAGING THE INDUCER.
DRILL 1/8” DIAMETER HOLES
THROUGH THE VENT PIPE AND
COLLAR AND USE #8 SCREWS TO
ATTACH. SEE FIGURE 12. FAILURE
TO FOLLOW THIS WARNING CAN
CAUSE RECIRCULATION OF FLUE
PRODUCTS CAUSING CARBON
MONOXIDE POISONING RESULTING
IN PERSONAL INJURY OR DEATH.
WARNING
!
BLOWER AND BURNERS MUST
NEVER BE OPERATED WITHOUT
THE BLOWER DOOR IN PLACE.
THIS IS TO PREVENT DRAWING
GAS FUMES (WHICH COULD
CONTAIN HAZARDOUS CARBON
MONOXIDE) INTO THE HOME THAT
COULD RESULT IN PERSONAL
INJURY OR DEATH.
WARNING
!
A SOLID METAL BASE PLATE, (SEE
TABLE 1) MUST BE IN PLACE WHEN
THE FURNACE IS INSTALLED WITH
SIDE AIR RETURN DUCTS. FAILURE
TO INSTALL A BASE PLATE COULD
CAUSE PRODUCTS OF
COMBUSTION TO BE CIRCULATED
INTO THE LIVING SPACE AND
CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING OR DEATH.
6
CAUTION
!
COMBUSTION AIR INTAKES CANNOT
BE TERMINATED OUTSIDE. DOING
SO CAN CAUSE IMPROPER
OPERATION OF THE FURNACE.
CAUTION
!
USE OF SHEET METAL AIR INTAKE
PIPE INSTEAD OF PVC MAY RESULT
IN NOISE ISSUES.
WARNING
!
DO NOT CONNECT THIS FURNACE
TO A CHIMNEY USED TO VENT A
SOLID FUEL APPLIANCE (WOOD OR
COAL). VENTING WITH A SOLID
FUEL APPLIANCE CAN LEAD TO
IMPROPER FUNCTIONING OF THE
UNIT, AND DUE TO SOOTING, THE
POSSIBILITY OF FIRE RESULTING IN
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
WARNING
!
HIS FURNACE IS EQUIPPED AT THE
T
ACTORY FOR USE ON NATURAL
F
AS ONLY. CONVERSION TO LP GAS
G
EQUIRES A SPECIAL KIT
R
AVAILABLE FROM THE
DISTRIBUTOR. FAILURE TO USE THE
PROPER CONVERSION KIT CAN
CAUSE FIRE, CARBON MONOXIDE
POISONING, EXPLOSION,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
CAUTION
!
ELEVATIONS ABOVE 2000 FT
REQUIRE THAT THE FURNACE
INPUT RATING BE ADJUSTED AND
THAT THE SIZE OF THE BURNER
ORIFICES BE RE-CALCULATED
BASED ON ELEVATION AND GAS
HEATING VALUE. THE BURNER
ORIFICES MAY (OR MAY NOT) NEED
TO BE CHANGED. SEE THE
SECTION TITLED “HIGH ALTITUDE
INSTALLATIONS”OF THIS BOOK
FOR INSTRUCTIONS.
WARNING
!
NEVER PURGE A GAS LINE INTO
THE COMBUSTION CHAMBER.
NEVER USE MATCHES, FLAME OR
ANY IGNITION SOURCE FOR
CHECKING LEAKAGE. FAILURE TO
FOLLOW THIS WARNING CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
WARNING
!
TURN OFF ELECTRIC POWER AT
THE FUSE BOX OR SERVICE PANEL
BEFORE MAKING ANY ELECTRICAL
CONNECTIONS.
ALSO, THE GROUND CONNECTION
MUST BE COMPLETED BEFORE
MAKING LINE VOLTAGE
CONNECTIONS. FAILURE TO DO SO
CAN RESULT IN ELECTRICAL
SHOCK, SEVERE PERSONAL
INJURY OR DEATH.
WARNING
!
HE CABINET MUST BE
T
ERMANENTLY GROUNDED. A
P
ROUND SCREW IS PROVIDED IN
G
HE JUNCTION BOX FOR THIS
T
URPOSE. FAILURE TO DO SO CAN
P
ESULT IN FIRE, ELECTRICAL
R
HOCK, PERSONAL INJURY OR
S
EATH.
D
CAUTION
!
INSTALLATION OF THIS FURNACE
AT ALTITUDES ABOVE 2000 FT (610
m) SHALL BE IN ACCORDANCE
WITH LOCAL CODES, OR IN THE
BSENCE OF LOCAL CODES, THE
A
NATIONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54 OR NATIONAL
STANDARD OF CANADA, NATURAL
GAS AND PROPANE INSTALLATION
CODE, CAN B149.1.
WARNING
!
BE SURE THAT THE MANUAL GAS
VALVE HAS BEEN IN THE “OFF”
POSITION FOR AT LEAST FIVE
MINUTES. DO NOT ATTEMPT TO
MANUALLY LIGHT THE MAIN
BURNERS. FAILURE TO FOLLOW
THIS WARNING CAN CAUSE A FIRE
OR AN EXPLOSION RESULTING IN
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
WARNING
!
SHOULD OVERHEATING OCCUR OR
THE GAS SUPPLY FAIL TO SHUT
OFF, SHUT OFF THE MANUALGAS
VALVE TO THE APPLIANCE BEFORE
SHUTTING OFF THE ELECTRICAL
SUPPLY. FAILURE TO DO SO CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY DAMAGE,
PERSONALINJURY OR DEATH.
CAUTION
!
DISCONNECT THE ELECTRICAL
SUPPLY TO THE FURNACE BEFORE
ATTEMPTING TO CHANGE THE
BLOWER SPEED. FAILURE TO DO SO
CAN CAUSE ELECTRICAL SHOCK
RESULTING IN SEVERE PERSONAL
INJURY OR DEATH.
CAUTION
!
IT IS IMPORTANT THAT EACH DUCT
SYSTEM BE SIZED AND INSTALLED
FOR THE SPECIFIC APPLICATION BY
PROPERLY APPLYING THE
APPROPRIATE INDUSTRY
ACCEPTED STANDARD. IF LESS
THAN MINIMUM STANDARDS ARE
APPLIED, THE EQUIPMENT USER
COULD EXPECT TO EXPERIENCE
HIGHER UTILITY BILLS, MAJOR
COMPONENT FAILURE, VARYING
DEGREES OF AIR NOISE OR OTHER
UNSATISFACTORY ISSUES, OVER
WHICH THE MANUFACTURER HAS
NO CONTROL.
WARNING
!
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING IN
SEVERE PERSONAL INJURY OR
DEATH.
WARNING
!
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA AROUND
THE FURNACE MUST BE KEPT
CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIALS
INCLUDING GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR FOR
ANY OTHER STORAGE PURPOSES.
WARNING
!
HOLES IN THE VENT PIPE OR HEAT
EXCHANGER CAN CAUSE TOXIC
FUMES TO ENTER THE HOME
RESULTING IN CARBON MONOXIDE
POISONING OR DEATH. THE VENT
PIPE OR HEAT EXCHANGER MUST
BE REPLACED IF THEY LEAK.
7
GENERAL INFORMATION
The 80% gas furnaces are design
certified by CSA for use with natural and
propane gases as follows:
As a Category I furnace, it may be
vented vertically with type B-1 vent
pipe and also may be common
vented as described in these
instructions.
This furnace should be installed in
accordance with the American National
Standard Z223.1 - latest edition booklet
entitled “National Fuel Gas Code”
(NFPA 54) (in Canada, CSA B149.1 and
.2 Installation Codes for gas burning
appliances), and the requirements or
codes of the local utility or other
authority having jurisdiction including
local plumbing or waste water codes.
The National Appliance Energy
Conservation Act (NAECA) of 1987
states that any gas furnace
manufactured after January 1, 1992,
must have a minimum Annual Fuel
Utilization Efficiency (AFUE) of 78%.
The higher the AFUE percentage the
more usable heat energy the consumer
gets for every dollar of fuel purchased.
This is similar to the EPA's minimum gas
mileage requirement for automobiles. It
gives the consumer a relatively easy
way to make direct efficiency
comparisons between different furnace
brands and styles.
A high AFUE value, which translates into
a low operating cost, is not the only
concern that consumers have. They also
want a furnace with a reasonable
installed cost. They want a furnace that
provides them with comfort – their main
concern. And they expect a furnace with
exceptional reliability and longevity.
Gas furnace manufacturers are always
striving to provide consumers with the
best furnace value. The Low Profile
Furnace addresses all those consumer
needs. It gives exceptional efficiency
with a low installation cost. It delivers the
comfort the customer wants along with
the reliability they expect.
The key to all these customer benefits is
the furnace's heat exchanger. The
materials used to construct the furnace
in general and the heat exchanger in
particular make it a rugged, long lasting
unit. The unique heat exchanger design
provides the customer with a furnace
only 34 inches high. This gives the
consumer a unit easily installed in
almost every location that accepts all
customary accessories.
With the introduction of higher efficiency
furnaces, special attention must be paid
to the venting system. Only listed
venting systems may be used as stated
in the installation instructions and the
National Fuel Gas Code, ANSI Z223.1
(NFPA 54), or the Canadian CAN/CGA
B149.1 and B149.2 Installation Codes
for Gas Burning Appliances. Since
furnace technology and venting
requirements are changing, awareness
of local, state, and federal codes and
industry changes is imperative.
8
NOTE: Always perform a proper heat
loss calculation before specifying the
furnace size. This ensures that the
furnace is sized to adequately,
economically, heat the building and
provide the correct airflow for your
application.
IMPORTANT: PROPER APPLICATION,
INSTALLATION AND MAINTENANCE
OF THIS FURNACE IS A MUST IF
CONSUMERS ARE TO RECEIVE THE
FULL BENEFITS FOR WHICH THEY
HAVE PAID.
Additional helpful publications available
from the “National Fire Protection
Association” are: NFPA-90A –
FIGURE 1
MIGRATION OF DANGEROUS SUBSTANCES, FUMES, AND ODORS INTO LIVING SPACES
IMPORTANT INFORMATION
ABOUT EFFICIENCY AND
INDOOR AIR QUALITY
Central cooling and heating equipment
is only as efficient as the duct system
that carries the cooled or heated air. To
maintain efficiency, comfort and good
indoor air quality, it is important to have
the proper balance between the air
being supplied to each room and the air
returning to the cooling and heating
equipment.
Proper balance and sealing of the duct
system improves the efficiency of the
heating and air conditioning system
and improves the indoor air quality of
the home by reducing the amount of
airborne pollutants that enter homes
from spaces where the ductwork and /
or equipment is located. The
manufacturer and the U.S.
Environmental Protection Agency’s
Energy Star Program recommend that
central duct systems be checked by a
qualified contractor for proper balance
and sealing.
Installation of Air Conditioning and
Ventilating Systems 1985 or latest
edition. NFPA-90B – Warm Air Heating
and Air Conditioning Systems 1984.
These publications are available from:
National Fire Protection Association,
Inc.
Batterymarch Park
Quincy, MA 02269
CSA-INTERNATIONAL
178 Rexdale Blvd.
Etobicoke (Toronto), Ontario
Canada M9W, 1R3
WARNING
!
DUCT LEAKS CAN CREATE AN
UNBALANCED SYSTEM AND DRAW
POLLUTANTS SUCH AS DIRT, DUST,
FUMES AND ODORS INTO THE
HOME CAUSING PROPERTY
DAMAGE. FUMES AND ODORS
FROM TOXIC, VOLATILE OR
FLAMMABLE CHEMICALS, AS WELL
AS AUTOMOBILE EXHAUST AND
CARBON MONOXIDE (CO), CAN BE
DRAWN INTO THE LIVING SPACE
THROUGH LEAKING DUCTS AND
UNBALANCED DUCT SYSTEMS
CAUSING PERSONAL INJURY OR
DEATH (SEE FIGURE 1).
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
GARAGES OR OFF-GARAGE
STORAGE AREAS - ALL JOINTS,
SEAMS, AND OPENINGS IN THE
EQUIPMENT AND DUCT MUST BE
SEALED TO LIMIT THE MIGRATION
OF TOXIC FUMES AND ODORS
INCLUDING CARBON MONOXIDE
FROM MIGRATING INTO THE
LIVING SPACE.
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
SPACES CONTAINING FUEL
BURNING APPLIANCES SUCH AS
WATER HEATERS OR BOILERS ALL JOINTS, SEAMS, AND
OPENINGS IN THE EQUIPMENT
AND DUCT MUST ALSO BE
SEALED TO PREVENT
DEPRESSURIZATION OF THE
PACE AND POSSIBLE
S
MIGRATION OF COMBUSTION
BYPRODUCTS INCLUDING
CARBON MONOXIDE INTO THE
LIVING SPACE.
NOTICE
IMPROPER INSTALLATION, OR
INSTALLATION NOT MADE IN
ACCORDANCE WITH THE
UNDERWRITERS LABORATORY (UL)
CERTIFICATION OR THESE
INSTRUCTIONS, CAN RESULT IN
UNSATISFACTORY OPERATION
AND/OR DANGEROUS CONDI-TIONS
AND ARE NOT COVERED BY THE
UNIT WARRANTY.
NOTICE
IN COMPLIANCE WITH
RECOGNIZED CODES, IT IS
RECOMMENDED THAT AN
AUXILIARY DRAIN PAN BE
INSTALLED UNDER ALL
EVAPORATOR COILS OR UNITS
CONTAINING EVAPORATOR COILS
OR GAS FURNACES USED WITH
EVAPORATOR COILS THAT ARE
LOCATED IN ANY AREA OF A
STRUCTURE WHERE DAMAGE TO
THE BUILDING OR BUILDING
CONTENTS MAY OCCUR AS A
RESULT OF AN OVERFLOW OF THE
COIL DRAIN PAN OR A STOPPAGE IN
THE PRIMARY CONDENSATE DRAIN
PIPING.
RECEIVING
Immediately upon receipt, all cartons
and contents should be inspected for
transit damage. Units with damaged
cartons should be opened immediately.
If damage is found, it should be noted
on the delivery papers, and a damage
claim filed with the last carrier.
• After unit has been delivered to job
site, remove carton taking care not to
damage unit.
• Check the unit rating plate for unit
size, electric heat, coil, voltage,
phase, etc. to be sure equipment
matches what is required for the job
specification.
• Read the entire instructions before
starting the installation.
• Some building codes require extra
cabinet insulation and gasketing
when unit is installed in attic
applications.
• If installed in an unconditioned space,
apply caulking around the power
wires, control wires, refrigerant tubing
and condensate line where they enter
the cabinet. Seal the power wires on
the inside where they exit conduit
opening. Caulking is required to
prevent air leakage into and
condensate from forming inside the
unit, control box, and on electrical
controls.
• Install the unit in such a way as to
allow necessary access to the
coil/filter rack and blower/control
compartment.
• Install the unit in a level position to
ensure proper condensate drainage.
Make sure unit is level in both
directions within 1/8”.
• Install the unit in accordance with
any local code which may apply and
the national codes. Latest editions
are available from: “National Fire
Protection Association, Inc.,
Batterymarch Park, Quincy, MA
02269.” These publications are:
• ANSI/NFPA No. 70-(Latest Edition)
National Electrical Code.
• NFPA90A Installation of Air
Conditioning and Ventilating
Systems.
• NFPA90B Installation of warm air
heating and air conditioning systems.
• The equipment has been evaluated
in accordance with the Code of
Federal Regulations, Chapter XX,
Part 3280.
LOCATION REQUIREMENTS AND CONSIDERATIONS
GENERAL INFORMATION
1. NOTE: This furnace is shipped with
heat exchanger support brackets
installed under the back of the heat
exchanger. These may be removed
before installation, but it is not
required.
LOCATION
!
WARNING
THIS FURNACE IS NOT APPROVED
FOR INSTALLATION IN A MOBILE
HOME. DO NOT INSTALL THIS
FURNACE IN A MOBILE HOME.
INSTALLATION IN A MOBILE HOME
COULD CAUSE FIRE, PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
2. IMPORTANT: This furnace is not
approved or recommended for
installation on its back, with access
doors facing upwards.
3. This furnace is suitable for
installation in buildings constructed
on-site. This heating unit should be
centralized with respect to the heat
distribution system as much as
practicable.
4. NOTE: These furnaces are
approved for installation in attics, as
well as alcoves, utility rooms,
closets and crawlspaces.
5. IMPORTANT: Support this unit when
installed. For attic or crawl space
installation, horizontal furnaces may
be installed on combustible wood
flooring or by using support brackets.
See Figure 2.
FIGURE 2
HORIZONTAL FURNACE INSTALLED W/SUPPORT BRACKETS
EXHAUST
VENT
NOTE: Do not block furnace
access with support rods. Maintain
clearances recommended in Figure 2.
Allow enough space for proper service
maintenance or replacement of the heat
exchanger and blower assembly.
6. IMPORTANT: If installing in a utility
room, be sure the door is wide
enough to:
a. allow the largest part of the
b. allow any other appliance (such
furnace to pass; or
as a water heater) to pass.
ST-A0799-01
9
FIGURE 3
PFLOW/HORIZONTAL DIMENSIONS
U
Ship.
/32
19
15
20
/16
1
28
➀ May require 3” to 4” or 3” or 5” adapter.
➁ May be 0” with type B vent.
Back Top Front Vent
REDUCED CLEARANCE (IN.)
➂ May be 1” with type B vent.
/16
7
24
/8
5
26
/8 DIA.
/8 DIA.
5
7
1
/8 DIA.
7
23
D
/2
Left Right
Side Side Wgts.
/8 0 4➁ 0 1 3 6➂ 85 lbs.
/2 0 3➁ 0 1 3 6➂ 105 lbs.
/2 0 3➁ 0 1 3 6➂ 115 lbs.
/2 0 0 0 1 3 6➂ 120 lbs.
/2 0 0 0 1 3 6➂ 140 lbs.
7
1
1
/2 1
1
/8 ➀ 11
/8 ➀ 15 2
/8 ➀ 15 2
5
3
3
/32 10
/32 12
/32 12
27
11
11
/2 16
/2 16
1
A B C D E F
1
/2 0 0 0 1 3 6➂ 150 lbs.
1
1
1
/2 2
1
/8 ➀ 18
/8 ➀ 22 2
/8 ➀ 22 2
1
7
7
/32 14
/32 15
/32 15
27
11
11
/2 23
/2 23
1
1
/16
9
/32
ALTERNATE
GAS CONNECTION
/32
19
B
A
/4
3
11
24
34
1
11
/8
3
14
RIGHT SIDE
FRONT
75 17
50 14 12
kBtu
Input-
3
Tons
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
UPFLOW/HORIZONTAL MODELS
/4
1
1
3 & 4
/32
17
23
125 24
100 17
3
150 24
100 21 19
5
5
4.5&5
/32
19
SIGHT
GLASS
AIRFLOW
/32
11
AIR
BOTTOM
RETURN
E
24
/8
3
14
/2
1
11
10
/2
1
24
/16
TOP
AIR
SUPPLY
C
13
26
/8
5
26
GAS CONNECTION
LOW VOLTAGE
LEFT SIDE
F
ELECTRICAL CONNECTION
(EITHER SIDE) FOR USE WITH
EXTERNAL SIDE FILTER FRAME
OPTIONAL RETURN AIR CUTOUT
25.406
IMPORTANT: This furnace is not approved or recommended for
installation on its back, with access doors facing upwards.
FIGURE 4
DOWNFLOW DIMENSIONS
Ship.
➀ May require 3” to 4” or 3” or 5” adapter.
➁ May be 0” with type B vent.
Back Top Front Vent
REDUCED CLEARANCE (IN.)
➂ May be 1” with type B vent.
/8
5
/8
1
20
/16
1
28
/8
5
26
/8 DIA.
/8 DIA.
7
7
/16
7
24
/8 DIA.
5
1
D
Left Right
Side Side Wgts.
/8 0 4➁ 0 1 3 6➂ 85 lbs.
/8 0 3➁ 0 1 3 6➂ 105 lbs.
/8 0 3➁ 0 1 3 6➂ 115 lbs.
/8 0 0 0 1 3 6➂ 120 lbs.
/8 0 0 0 1 3 6➂ 140 lbs.
1
5
5
/8 0 0 0 1 3 6➂ 150 lbs.
1
5
5
/8
3
/16
3
6
20
/8
/8 ➀ 13
/8 ➀ 16
/8 ➀ 16
/8 ➀ 20
/8 ➀ 23
3
1
1
/32 10
/32 12
/32 12
27
11
11
/2 16
/2 16
1
A B C D E
1
/8 ➀ 23
7
5
5
/32 13
/32 15
/32 15
27
11
11
/2 23
/2 23
1
1
/8
5
/4
3
3
23
34
50 14 12
75 17
100 17
100 21 19
125 24
kBtu
Input-
3
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
DOWNFLOW MODELS
Tons
3
3 & 4
150 24
5
5
5 & 5.5
/4
3
19
R.A.
B
A
/8
5
SIGHT
GLASS
AIRFLOW
S.A.
E
/8
5
26
TOP BOTTOM
C
LOW VOLTAGE
/8
3
23
/8
3
20
/16
3
6
/16
13
26
GAS CONNECTION
/2
1
24
ELECTRIC CONNECTION
NOTE: IN DOWNFLOW CONFIGURATION, OPTIONAL AIR CUTOUT IS NOT PERMITTED.
11
CLEARANCE –
ACCESSIBILITY
The design of forced air furnaces with
nput ratings as listed in the tables on
i
the following pages are certified by
CSA for the clearances to combustible
materials shown in inches.
See name/rating plate and clearance
label for specific model number and
clearance information.
Service clearance of at least 24 inches
is recommended in front of all furnaces.
ACCESSIBILITY CLEARANCES,
WHERE GREATER, MUST TAKE
PRECEDENCE OVER FIRE
PROTECTION CLEARANCES.
!
WARNING
UPFLOW AND HORIZONTAL
FURNACES MUST NOT BE
INSTALLED DIRECTLY ON
CARPETING, TILE OR OTHER
COMBUSTIBLE MATERIAL OTHER
THAN WOOD FLOORING.
INSTALLATION ON A COMBUSTIBLE
MATERIAL CAN RESULT IN FIRE
CAUSING PROPERTY DAMAGE,
SEVERE PERSONAL INJURY OR
DEATH.
A gas-fired furnace for installation in a
residential garage must be installed so
that the burner(s) and the ignition
source are located not less than 18”
above the floor and the furnace is
located or protected to avoid physical
damage by vehicles.
!
WARNING
DOWNFLOW UNIT DESIGN IS
CERTIFIED FOR INSTALLATION ON
NON-COMBUSTIBLE FLOOR. A
SPECIAL COMBUSTIBLE FLOOR
SUB-BASE IS REQUIRED WHEN
INSTALLING ON A COMBUSTIBLE
FLOOR. FAILURE TO INSTALL THE
SUB-BASE MAY RESULT IN FIRE,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH. THIS SPECIAL
BASE IS OFFERED AS AN
ACCESSORY FROM THE FACTORY.
SEE THE CLEARANCE LABEL
LOCATED INSIDE THE FURNACE
FOR THE APPROPRIATE MODEL
NUMBER.
THE SPECIAL BASE IS NOT
REQUIRED WHEN THE FURNACE IS
INSTALLED ON TOP OF AN AIR
CONDITIONING PLENUM.
TABLE 1
FURNACE BASE BASE
IDTH
W
14” RXGB-D14 11
1
17
/2” RXGB-D17 151/8” x 239/16”
21” RXGB-D21 18
1
24
/2” RXGB-D24 255/8” x 239/1
LATE NO.
P
LATE SIZE
P
5
/8” x 239/16”
5
/8” x 239/16”
6
”
SITE SELECTION
1. Select a site in the building near the
center of the proposed, or existing,
duct system.
2. Give consideration to the vent system
piping when selecting the furnace
location. Be sure the venting system
can travel from the furnace to the
termination with minimal length and
elbows.
3. Locate the furnace near the existing
gas piping. Or, if running a new gas
line, locate the furnace to minimize
the length and elbows in the gas
piping.
4. Locate the furnace to maintain proper
clearance to combustibles as shown
in Figures 3 and 4.
!
CAUTION
WHEN COILS ARE USED WITH AIR
HANDLERS OR FURNACES AND
INSTALLED ABOVE A FINISHED
CEILING OR LIVING AREA, IT IS
RECOMMENDED THAT AN
AUXILIARY SHEET METAL
CONDENSATE DRAIN PAN BE
FABRICATED AND INSTALLED
UNDER ENTIRE UNIT. FAILURE TO
DO SO CAN RESULT IN PROPERTY
DAMAGE. RUN CONDENSATE TO A
LOCATION WHERE IT IS
NOTICEABLE.
!
WARNING
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA AROUND
THE FURNACE MUST BE KEPT
CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIALS
INCLUDING GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR FOR
ANY OTHER STORAGE PURPOSES.
DUCTING
Proper air flow is required for the
correct operation of this furnace. Too
ittle air flow can cause erratic
l
operation and can damage the heat
exchanger. The duct system must
arry the correct amount of air for
c
heating and cooling. Position the unit
minimize long runs or runs with many
urns and elbows.
t
Size the ducts according to acceptable
industry standards and methods. The
total static pressure drop (including
evaporator coil, if used) of the entire
system should not exceed 0.5” w.c. Be
sure to have adequate space for unit
filter. NOTE: Airflow external static
pressure measurements do not include
filter or coil.
IMPORTANT: Some high efficiency
filters have a greater than normal
resistance to air flow. This can
adversely affect furnace operation. BE
SURE TO CHECK AIR FLOW if using
any filter other than the factoryprovided filter.
NOTE: DO NOT take return air from
bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.
IMPORTANT: When using outside air,
design and adjust the system to
maintain a return air temperature
above 50°F during the heating season.
!
WARNING
NEVER ALLOW PRODUCTS OF
COMBUSTION OR THE FLUE
PRODUCTS TO ENTER THE
RETURN AIR DUCTWORK, OR THE
CIRCULATING AIR SUPPLY. ALL
RETURN DUCTWORK MUST BE
ADEQUATELY SEALED AND
SECURED TO THE FURNACE WITH
SHEET METAL SCREWS, AND
JOINTS TAPED. WHEN A FURNACE
IS MOUNTED ON A PLATFORM,
WITH RETURN THROUGH THE
BOTTOM, IT MUST BE SEALED
AIRTIGHT BETWEEN THE FURNACE
AND THE RETURN AIR PLENUM.
THE RETURN AIR PLENUM MUST
BE PERMANENTLY ENCLOSED.
NEVER USE A DOOR AS A PART OF
THE RETURN AIR PLENUM. THE
FLOOR OR PLATFORM MUST
PROVIDE SOUND PHYSICAL
SUPPORT OF THE FURNACE,
WITHOUT SAGGING, CRACKS,
GAPS, ETC., AROUND THE BASE AS
TO PROVIDE A SEAL BETWEEN
THE SUPPORT AND THE BASE.
12
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