Rheem GPT series User manual

92-24161-96-01
SUPERSEDES 92-24161-96-00
INSTALLATION INSTRUCTIONS
FOR UPFLOW/HORIZONTAL & DOWNFLOW INDUCED
DRAFT GAS FURNACES WITH ECM X-13 MOTORS
(-)GPT UPFLOW/HORIZONTAL SERIES
(-)GLT DOWNFLOW SERIES

2
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 spe ifi s.)
GAS SUPPLY
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.)
ELECTRICAL
orrect thermostat and subbase Thermostat model Subbase model
orrect thermostat mode and setting
orrect line supply voltage
orrect power supply polarity is required with electronic ignition
orrect furnace ground to electrical panel
D microamp (∝A) flame signal (hot surface ignition units)
orrect control voltage
Measure and set heat anticipator amperage
Air conditioning low voltage wires connected to terminals “Y” “ ” - not with wire nuts
VENTING
orrect vent pipe diameter and length (according to SA tables) Vent connection size
orrect venting material (according to SA tables)
orrect 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
orrect 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.
orrect filter(s)
orrect 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

33
IMPORTANT: TO INSURE PROPER INSTALLATION AND OPERATION OF
THIS PRODUCT, CO PLETELY READ ALL INSTRUCTIONS PRIOR TO
ATTE PTING TO ASSE BLE, INSTALL, OPERATE, AINTAIN OR REPAIR
THIS PRODUCT. UPON UNPACKING OF THE FURNACE, INSPECT ALL
PARTS FOR DA AGE PRIOR TO INSTALLATION AND START-UP.
CONTENTS
Installation heck List ..............................................................................................2
Safety Information ....................................................................................................4
General Information..................................................................................................6
Location Requirements and onsiderations ............................................................7
ombustion and Ventilation Air..............................................................................12
Vent Pipe Installation..............................................................................................16
Gas Supply and Piping...........................................................................................19
Electrical Wiring......................................................................................................23
Thermostat .............................................................................................................23
Accessories ............................................................................................................24
Furnace Twinning...................................................................................................24
High Altitude Installations .......................................................................................27
Start-Up Procedures...............................................................................................30
Air Flow...................................................................................................................32
Blower Performance Data ......................................................................................33
Safety Features ......................................................................................................34
Maintenance...........................................................................................................35
Troubleshooting......................................................................................................38
Wiring Diagram.......................................................................................................39
Important: All manufacturer products
meet current Federal OSHA Guidelines
for safety. alifornia Proposition 65
warnings are required for certain
products, which are not covered by the
OSHA standards.
alifornia's Proposition 65 requires
warnings for products sold in alifornia
that contain, or produce, any of over
600 listed chemicals known to the State
of alifornia to cause cancer or birth
defects such as fiberglass insulation,
lead in brass, and combustion products
from natural gas.
All “new equipment” shipped for sale in
alifornia 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
alifornia 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
• arbon Monoxide ( O)
• Formaldehyde
• Benzene
More details are available at the
Websites for OSHA (Occupational
Safety and Health Administration), at
www.osha.gov and the State of
alifornia's OEHHA (Office of
Environmental Health Hazard
Assessment), at www.oehha.org.
onsumer 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.

4
USE ONLY WITH TYPE OF GAS
APPROVED FOR THIS FURNACE.
REFER TO THE FURNACE RATING
PLATE.
INSTALL THIS FURNACE ONLY IN
ALOCATION AND POSITION AS
SPECIFIED IN THE LOCATION
REQUIREMENTS AND
CONSIDERATIONS SECTION OF
THESE INSTRUCTIONS.
PROVIDE ADEQUATE
COMBUSTION AND VENTILATION
AIR TO THE FURNACE SPACE AS
SPECIFIED IN THE VENTING
SECTION OF THESE
INSTRUCTIONS.
COMBUSTION PRODUCTS MUST
BE DISCHARGED OUTDOORS.
CONNECT THIS FURNACE TO AN
APPROVED VENT SYSTEM ONLY,
AS SPECIFIED IN VENT PIPE
INSTALLATION SECTION OF
THESE INSTRUCTIONS.
THE MANUFACTURER IS NOT
RESPONSIBLE FOR EQUIPMENT
THAT IS MISMATCHED OR
IMPROPERLY INSTALLED.
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.
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 PLATE.
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.
WHEN THIS FURNACE IS
INSTALLED IN A RESIDENTIAL
GARAGE, IT MUST BE INSTALLED
SO THE BURNERS AND IGNITION
SOURCE ARE LOCATED NO LESS
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
VEHICLES. FAILURE TO FOLLOW
THESE WARNINGS CAN CAUSE A
FIRE OR EXPLOSION, RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
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
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
SAFETY INFORMATION

5
DUCT LEAK CAN CREATE AN
UNBALANCED Y TEM AND
DRAW POLLUTANT UCH A
DIRT, DU T, FUME AND ODOR
INTO THE HOME CAU ING
PROPERTY DAMAGE. FUME
AND ODOR FROM TOXIC,
VOLATILE OR FLAMMABLE
CHEMICAL , A WELL A
AUTOMOBILE EXHAU T AND
CARBON MONOXIDE (CO), CAN
BE DRAWN INTO THE LIVING
PACE THROUGH LEAKING
DUCT AND UNBALANCED DUCT
Y TEM CAU ING PER ONAL
INJURY OR DEATH ( EE FIGURE
1).
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK I LOCATED IN
GARAGE OR OFF-GARAGE
TORAGE AREA - ALL JOINT ,
EAM , AND OPENING IN THE
EQUIPMENT AND DUCT MU T
BE EALED TO LIMIT THE
MIGRATION OF TOXIC FUME
AND ODOR INCLUDING
CARBON MONOXIDE FROM
MIGRATING INTO THE LIVING
PACE.
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK I LOCATED IN
PACE CONTAINING FUEL
BURNING APPLIANCE UCH
A WATER HEATER OR
BOILER - ALL JOINT , EAM ,
AND OPENING IN THE
EQUIPMENT AND DUCT MU T
AL O BE EALED TO PREVENT
DEPRE URIZATION OF THE
PACE AND PO IBLE
MIGRATION OF COMBU TION
BYPRODUCT INCLUDING
CARBON MONOXIDE INTO THE
LIVING PACE.
IMPROPER IN TALLATION, OR
IN TALLATION NOT MADE IN
ACCORDANCE WITH THE C A
INTERNATIONAL (C A)
CERTIFICATION OR THE E
IN TRUCTION , CAN RE ULT IN
UN ATI FACTORY OPERATION
AND/OR DANGEROU CONDI-
TION AND ARE NOT COVERED
BY THE UNIT WARRANTY.
IN COMPLIANCE WITH
RECOGNIZED CODE , IT I
RECOMMENDED THAT AN
AUXILIARY DRAIN PAN BE
IN TALLED UNDER ALL
EVAPORATOR COIL OR UNIT
CONTAINING EVAPORATOR
COIL THAT ARE LOCATED IN
ANY AREA OF A TRUCTURE
WHERE DAMAGE TO THE
BUILDING OR BUILDING
CONTENT MAY OCCUR A A
RE ULT OF AN OVERFLOW OF
THE COIL DRAIN PAN OR A
TOPPAGE IN THE PRIMARY
CONDEN ATE DRAIN PIPING. EE
ACCE ORIE ECTION OF
THE E IN TRUCTION FOR
AUXILIARY HORIZONTAL
OVERFLOW PAN INFORMATION
(MODEL RXBM).
!WARNING NOTICE
NOTICE

6
The (-)GPT/(-)GLT series furnaces are
design certified by SA for use with
natural and propane gases as follows:
As a ategory 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 ode”
(NFPA 54) (in anada, SA B149.1
and .2 Installation odes 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
onservation Act (NAE A) 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.
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
APPLI ATION, INSTALLATION AND
MAINTENAN E OF THIS FURNA E
IS A MUST IF ONSUMERS ARE TO
RE EIVE THE FULL BENEFITS FOR
WHI H THEY HAVE PAID.
Additional helpful publications available
from the “National Fire Protection
Association” are: NFPA-90A –
Installation of Air onditioning and
Ventilating Systems 1985 or latest
edition. NFPA-90B – Warm Air Heating
and Air onditioning Systems 1984.
These publications are available from:
National Fire Protection Association,
Inc.
Batterymarch Park
Quincy, MA 02269
SA-INTERNATIONAL
178 Rexdale Blvd.
Etobicoke (Toronto), Ontario
anada M9W, 1R3
IMPORTANT INFORMATION
ABOUT EFFICIENCY AND
INDOOR AIR
QUALITY
entral 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.
DUCT LEAK CAN CREATE AN
UNBALANCED Y TEM AND DRAW
POLLUTANT UCH A DIRT,
DU T, FUME AND ODOR INTO
THE HOME CAU ING PROPERTY
DAMAGE. FUME AND ODOR
FROM TOXIC, VOLATILE OR
FLAMMABLE CHEMICAL , A
WELL A AUTOMOBILE EXHAU T
AND CARBON MONOXIDE (CO),
CAN BE DRAWN INTO THE LIVING
PACE THROUGH LEAKING DUCT
AND UNBALANCED DUCT
Y TEM CAU ING PER ONAL
INJURY OR DEATH ( EE FIGURE 1).
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK I LOCATED IN
GARAGE OR OFF-GARAGE
TORAGE AREA - ALL JOINT ,
EAM , AND OPENING IN THE
EQUIPMENT AND DUCT MU T BE
EALED TO LIMIT THE
MIGRATION OF TOXIC FUME
AND ODOR INCLUDING
CARBON MONOXIDE FROM
MIGRATING INTO THE LIVING
PACE.
• IF AIR-MOVING EQUIPMENT OR
DUCTWORK I LOCATED IN
PACE CONTAINING FUEL
BURNING APPLIANCE UCH A
WATER HEATER OR BOILER -
GENERAL INFORMATION
FIGURE 1
MIGRATION OF DANGEROU UB TANCE , FUME , AND ODOR INTO LIVING PACE
!WARNING

7
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
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.
6. IMPORTANT:If installing in a utility
room, be sure the door is wide
enough to:
a. allow the largest part of the
furnace to pass; or
b. allow any other appliance (such
as a water heater) to pass.
LOCATION REQUIREMENTS AND CONSIDERATIONS
WARNING
!
FIGURE 2
HORIZONTAL FURNACE INSTALLED W/SUPPORT BRACKETS
ST-A0799-01
NOTE: Do not block furnace
access with support rods. Maintain
clearances recommended in Figure 3.
Allow enough space for proper service
maintenance or replacement of the heat
exchanger and blower assembly.
EXHAUST
VENT
ALL JOINT , EAM , AND
OPENING IN THE EQUIPMENT
AND DUCT MU T AL O BE
EALED TO PREVENT
DEPRE URIZATION OF THE
PACE AND PO IBLE
MIGRATION OF COMBU TION
BYPRODUCT INCLUDING
CARBON MONOXIDE INTO THE
LIVING PACE.
IMPROPER IN TALLATION, OR
IN TALLATION NOT MADE IN
ACCORDANCE WITH THE C A
INTERNATIONAL (C A)
CERTIFICATION OR THE E
IN TRUCTION , CAN RE ULT IN
UN ATI FACTORY OPERATION
AND/OR DANGEROU CONDI-
TION AND ARE NOT COVERED BY
THE UNIT WARRANTY.
IN COMPLIANCE WITH
RECOGNIZED CODE , IT I
RECOMMENDED THAT AN
AUXILIARY DRAIN PAN BE
IN TALLED UNDER ALL
EVAPORATOR COIL OR UNIT
CONTAINING EVAPORATOR COIL
THAT ARE LOCATED IN ANY AREA
OF A TRUCTURE WHERE
DAMAGE TO THE BUILDING OR
BUILDING CONTENT MAY OCCUR
A A RE ULT OF AN OVERFLOW
OF THE COIL DRAIN PAN OR A
TOPPAGE IN THE PRIMARY
CONDEN ATE DRAIN PIPING. EE
ACCE ORIE ECTION OF THE E
IN TRUCTION FOR AUXILIARY
HORIZONTAL OVERFLOW PAN
INFORMATION (MODEL RXBM).
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.
• heck 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.
aulking 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 ode.
• NFPA90A Installation of Air
onditioning and Ventilating
Systems.
• NFPA90B Installation of warm air
heating and air conditioning
systems.
• The equipment has been evaluated
in accordance with the ode of
Federal Regulations, hapter XX,
Part 3280.
NOTICE
NOTICE

8
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
UPFLOW/HORIZONTAL MODELS
TOP
LEFT SIDE
FRONT
RIGHT SIDE
ALTERNATE
GAS CONNECTION
BOTTOM
RETURN
AIR
AIRFLOW
SUPPLY
AIR
2613/16
265/8
2411/32
2411/32
19/32
9/16
247/16
281/16
265/8
143/8
111/2
34
15/8DIA.
23
15
20
D
7/8DIA.
7/8DIA.
19/32
19/32
3/4
143/8
111/2
11/4
2317/32
F
GAS ONNE TION
ELE TRI AL ONNE TION
OPTIONAL RETURN AIR UTOUT
(EITHER SIDE) FOR USE WITH
EXTERNAL SIDE FILTER FRAME
LOW VOLTAGE
E
SIGHT
GLASS
A
B
FIGURE 3
UPFLOW/HORIZONTAL DIMENSIONS
IMPORTANT: This furnace is not approved or recommended for
installation on its back, with access doors facing upwards.
REDUCED CLEARANCE (IN.)
Model A B C D E F Left Right Back Top Front Vent Ship.
Side Side Wgts.
05 14 1227/32 105/8➀111/217/80 4➁0 1 3 6➂85 lbs.
07 171/21611/32 123/8➀15 21/20 3➁0 1 3 6➂105 lbs.
10(A) 171/21611/32 123/8➀15 21/20 3➁0 1 3 6➂115 lbs. 10(B) 21 1927/32 141/8➀181/221/20 0 0 1 3 6➂120 lbs.
12 241/22311/32 157/8➀22 21/20 0 0 1 3 6➂140 lbs. 15 241/22311/32 157/8➀22 21/20 0 0 1 3 6➂150 lbs.
➀May require 3”to 4”or 3”or 5”adapter.
➁May be 0”with type B vent.
➂May be 1”with type B vent.
241/2
25.406

9
FIGURE 4
DOWNFLOW DIMENSIONS
REDUCED CLEARANCE (IN.)
Model A B C D E Left Right Back Top Front Vent Ship.
Side Side Wgts.
05 14 1227/32 103/8➀13 1/80 4➁0 1 3 6➂85 lbs.
07 171/21611/32 121/8➀16 5/80 3➁0 1 3 6➂105 lbs.
10(A) 171/21611/32 121/8➀16 5/80 3➁0 1 3 6➂115 lbs. 10(B) 21 1927/32 137/8➀20 1/80 0 0 1 3 6➂120 lbs.
12 241/22311/32 155/8➀23 5/80 0 0 1 3 6➂140 lbs. 15 241/22311/32 155/8➀23 5/80 0 0 1 3 6➂150 lbs.
TOP BOTTOM
241/2
193/4
A
BD
LOW VOLTAGE
GAS ONNE TION
ELE TRI ONNE TION
ES.A.
R.A.
265/8
2613/16
63/16
203/8
233/8
5/85/8
3/4
5/8
34
233/8
203/8
63/16
247/16
265/8
201/8
281/16
7/8DIA.
7/8DIA.
15/8DIA.
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
DOWNFLOW MODELS
NOTE: IN DOWNFLOW ONFIGURATION, OPTIONAL AIR UTOUT IS NOT PERMITTED.
➀May require 3”to 4”or 3”or 5”adapter. ➁May be 0”with type B vent. ➂May be 1”with type B vent.
SIGHT
GLASS
AIRFLOW

10
CLEARANCE –
ACCESSIBILITY
The design of forced air furnaces with
input ratings as listed in the tables on
the following pages are certified by
SA 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.
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.
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.
DUCTING
Proper air flow is required for the
correct operation of this furnace. Too
little air flow can cause erratic
operation and can damage the heat
exchanger. The duct system must
carry the correct amount of air for
heating and cooling. Position the unit
minimize long runs or runs with many
turns and elbows.
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 factory-
provided 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.
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.
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.
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.
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.
CAUTION
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
TABLE 1
FURNACE BASE BASE
WIDTH PLATE NO. PLATE SIZE
171/2” RXGB-D17 151/8”x 239/16”
21” RXGB-D21 185/8” x 239/16”
241/2” RXGB-D24 255/8” x 239/16”

11
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.
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.
UPFLOW UNITS
1. Set furnace in place and connect the
return duct or return air cabinet to
unit. Make the connection air-tight to
prevent entraining combustion
gases from any adjacent fuel-
burning appliances. Unit return air
may be connected on the sides or
bottom of the return air
compartment.
a. Openings in the side must be cut
out the full width of the knockouts
on the unit. If using side return air,
THE BOTTOM base plate must
be installed.
NOTE: Where the maximum
airflow is 1800 FM or more, both
sides or the bottom must be used
for return air.
b. If using bottom return air, place
furnace over return air plenum and
seal furnace bottom to return air
plenum.
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.
2. If summer air conditioning is desired,
position the indoor coil on the supply
air side of the furnace. Insure that no
air can bypass this coil.
3. onnect the supply air plenum to the
furnace plenum opening.
DOWNFLOW UNITS
THE DOWNFLOW FURNACE
DESIGN IS CERTIFIED FOR
INSTALLATION ON A NON-
COMBUSTIBLE 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.
1. Position the unit over the supply air
plenum and connect.
a. If installing on a combustible floor
and not using an evaporator
oil box, install the special
combustible floor base. See
Figure 5.
b. If summer air conditioning is
desired, position the indoor coil on
the bottom of the unit. Insure that
no air can bypass this coil.
2. onnect the return air ducting to the
return air opening at the top of the
unit. Make the connection air tight to
prevent entraining combustion
gases from an adjacent fuel-burning
appliance.
HORIZONTAL UNITS
1. Unit can be mounted left or right
side airflow configuration.
2. Position the unit on adequate
supports or by using support
brackets (see Figure 3) and connect
supply plenum.
3. If summer air conditioning is desired,
position the indoor coil on the supply
air side of the unit. Insure that no air
can bypass this coil.
4. Secure the four angle brackets
shipped with the unit to the return air
opening. See Figure 7. onnect the
return air ducting to the return air
opening at the top of the unit. Make
the connection air tight to prevent
entraining combustion gases from
an adjacent fuel-burning appliance.
NOTE: Do not block furnace access
with support rods. Maintain clearances
recommended in Figure 3. Allow
enough space for proper service
maintenance or replacement of the
heat exchanger and blower assembly.
WARNING
!
WARNING
!
WARNING
!
FIGURE 5
COMBUSTIBLE FLOOR BASE

12
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.
Adequate facilities for providing air for
combustion and ventilation must be
provided in accordance with section
5.3, Air for ombustion and
Ventilation, of the National Fuel Gas
ode, ANSI, Z223.1 latest edition or
SA B149.1 and .2 or, applicable
provisions for the local building codes,
and not obstructed so as to prevent the
flow of air to the furnace.
FIGURE 6
HORIZONTAL RETURN AIR DUCT
(LEFT-HAND AIRFLOW POSITION SHOWN)
FIGURE 7
AIR FROM HEATED SPACE
COMBUSTION AIR
REQUIREMENTS
IMPORTANT:Air for combustion and
ventilation must not come from a
corrosive atmosphere. Any failure due
to corrosive elements in the
atmosphere is excluded from warranty
coverage.
The following types of installation may
require OUTDOOR AIR for
combustion, due to chemical
exposures:
• ommercial buildings
• Buildings with indoor pools
• Furnaces installed in laundry rooms
• Furnaces in hobby or craft rooms
• Furnaces installed near chemical
storage areas.
Exposure to the following substances
in the combustion air supply may also
require OUTDOOR AIR for
combustion:
• Permanent wave solutions
• hlorinated waxes and cleaners
• hlorine-based swimming pool
chemicals
• Water softening chemicals
• De-icing salts or chemicals
• arbon tetrachloride
• Halogen type refrigerants
• leaning solvents (such as
perchloroethylene)
• Printing inks, paint removers,
varnishes, etc.
• Hydrochloric acid
• ements and glues
• Antistatic fabric softeners for clothes
dryers
• Masonry acid washing materials
COMBUSTION AND VENTILATION AIR
WARNING
!
FOUR ANGLE BRA KETS ARE SHIPPED WITH EA H
UNIT THAT AN BE INSTALLED HORIZONTALLY. THESE
BRA KETS MAY BE USED TO SE URE THE RETURN
AIR DU T TO A HORIZONTAL UNIT.
IMPORTANT: This is not a direct vent furnace. Review venting instructions
before installing.
RETURN
AIRFLOW
REAR VIEW

13
ombustion air must be free of acid
forming chemicals; such as sulphur,
fluorine and chlorine. These elements
are found in aerosol sprays,
detergents, bleaches, cleaning
solvents, air fresheners, paint and
varnish removers, refrigerants and
many other commercial and household
products. Vapors from these products
when burned in a gas flame form acid
compounds. The acid compounds
increase the dew point temperature of
the flue products and are highly
corrosive after they condense.
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.
ombustion air requirements are
determined by whether the furnace is
in an open (unconfined) area or in a
confined space such as a closet or
small room. See Figures 7 and 8.
EXAMPLE 1.
FURNACE LOCATED IN AN
UNCONFINED SPACE
Using indoor air for ombustion.
An unconfined space must have at
least 50 cubic feet for each 1,000
BTUH of the total input for all
appliances in the space. Here are a
few examples of the room sizes
required for different inputs. The sizes
are based on 8 foot ceilings.
BTUH Minimum Sq. Feet Typical Room Size
Input With 8' Ceiling With 8' Ceiling
50,000 312 14*x24*or 18*x18*
75,000 469 15*x31*or 20*x24*
100,000 625 20*x31*or 25*x25*
125,000 833 23*x34*or 26*x30*
150,000 938 25*x38*or 30*x31*
If the open space containing the
furnace is in a building with tight
construction (contemporary
construction), outside air may still be
required for the furnace to operate and
vent properly. Outside air openings
should be sized the same as for a
confined space.
FIGURE 8
AIR FROM ATTIC/CRAWL SPACE
EXAMPLE 2.
FURNACE LOCATED IN A
CONFINED SPACE
A confined space (any space smaller
than shown above as “unconfined”)
must have openings into the space
which are located in accordance with
the requirements set forth in the
following subsections A and B. Size the
openings by how they are connected to
the heated area or to the outside, and
by the input of all appliances in the
space.
If confined space is within a building
with tight construction, combustion air
must be taken from outdoors or area
freely communicating with the
outdoors.
A. USING INDOOR AIR FOR
OMBUSTION, ALL OF THE
MODELS (GPT, GLT)
IMPORTANT:Air should not be taken
from a heated space with a fireplace,
exhaust fan or other device that may
produce a negative pressure.
If combustion air is taken from the
heated area, the openings must
each have at least 100 square
inches of free area. Each opening
must have at least one square inch
of free area for each 1,000 Btuh of
total input in the space. Here are
some examples of typical openings
required.
Btuh Free Area
Input Ea h Opening
100,000 100 Square Inches
150,000 150 Square Inches
AIR INTAKE PIPE CONNECTION
(GPT ONLY)
A double-elbow may be installed to
top inlet air opening, BUT IS NOT
REQUIRED. This will help to prevent
a idental blo kage of the intake
opening. Referen e Figure 10 for
proper elbow diameter.
NOTE: Inlet is specifically designed to
prevent material from being pulled into
furnace. If elbows are not used, the
intake opening must be kept clean and
free of debris.
It is also a eptable to run the
ondensate drain (or refrigerant) line
a ess over the air intake hole as
long as a 1" minimum learan e is
maintained.
B. USING OUTDOOR AIR FOR
OMBUSTION, ALL OF THE
MODELS (GPT, GLT)
IMPORTANT:Never take
combustion air from an attic space
that is equipped with power
ventilation.
The confined space must
communicate with the outdoors
according to Methods 1 and 2. The
minimum air opening dimension
shall not be less than 3 inches.
When using ducts, they shall be of
the same cross-sectional area as
the free area of the openings to
which they connect.
WARNING
!

14
a. One square inch for each 3000
BTUH of the total input rating of all
equipment located in the enclosure,
AND
b. Not less than the sum of the areas
of all vent connectors in the confined
space.
IMPORTANT: If the furnace is in a
location with an exhaust fan, there
must be sufficient ventilation to prevent
the exhaust fan from creating a
negative pressure in the room.
ombustion air openings must NOT
BE RESTRICTED in any manner.
ONSULT LO AL ODES FOR
SPE IAL REQUIREMENTS.
B: Method 1
Provide two permanent openings,
one located within 12 inches of the
top and one located within 12
inches of the bottom of the
enclosure. Each opening shall
communicate directly, or by ducts,
with the outdoors or spaces (crawl
or attic) that freely communicate
with the outdoors.
a. Where directly communicating
with the outdoors or where
communicating to the outdoors
through VERTICAL DUCTS,
each opening shall have a
minimum free area of 1 square
in h for ea h 4000 BTUH of
total appliance input rating in the
enclosure. Here are typical duct
sizes:
b. Where communicating with
outdoors through HORIZONTAL
DUCTS, each opening shall have
a minimum free area of 1 square
in h for ea h 2000 BTUH of total
input rating for all equipment in
the enclosure. Here are typical
duct sizes:
B: Method 2
One permanent opening, located within
12 inches of the top of the enclosure,
shall be permitted where the
equipment has clearances of at least 1
inch from the sides and back and 6
inches from the front of the appliance.
The opening shall directly
communicate with the outdoors or
communicate through a vertical or
horizontal duct to the outdoors or
spaces (crawl or attic) that freely
communicate with the outdoors and
have a minimum free area of:
VERTICAL OUTDOOR AIR
OPENING DIMENSIONS
BTUH Free Area Round
Input Each Opening Pipe Size
50,000 12.50 sq. inches 4”
75,000 18.75 sq. inches 5”
100,000 25.00 sq. inches 6”
125,000 31.25 sq. inches 7”
150,000 37.50 sq. inches 7”
HORIZONTAL OUTDOOR AIR
OPENING DIMENSIONS
BTUH Free Area Round
Input Each Opening Pipe Size
50,000 25.00 sq. inches 6”
75,000 37.50 sq. inches 7”
100,000 50.00 sq. inches 8”
125,000 62.50 sq. inches 9”
150,000 75.00 sq. inches 10”
FIGURE 9
COMBUSTION AIR FITTING – NON-ATTIC COMBUSTION AIR PULL, GPT ONLY
ATTA H OPTIONAL DOUBLE ELBOW TO TOP INLET
AIR OPENING TO PREVENT A IDENTAL BLO KAGE
OF INTAKE OPENING. THIS IS NOT A REQUIREMENT.
(SEE PREVIOUS PAGE.) SINGLE ELBOW IS ALLOWED
BUT MAY NOT PREVENT DEBRIS FROM BEING
DROPPED INTO THE FURNA E.
GROUND OR
SHELF SURFA E
6" MIN.
6" MININUM
LEARAN E
PV
DOUBLE
ELBOW
#8 S REWS
METAL FLUE
PIPE ONLY
EXHAUST
#8 S REWS

15
FIGURE 10
OUTSIDE AIR USING A HORIZONTAL INLET & OUTLET
FIGURE 11
COMBUSTION AIR FITTING – OPTIONAL ATTIC COMBUSTION AIR PULL, GPT ONLY
B: Method 3, GPT only
For the optimum in quiet operation,
attic air may be brought directly to the
furnace.
IMPORTANT: In applications using
Method 3 for combustion air, the attic
must be ventilated by gable or soffit
vents. See Figure 8.
COMBUSTION AIR INTAKES
CANNOT BE TERMINATED
OUTSIDE. DOING SO CAN CAUSE
IMPROPER OPERATION OF THE
FURNACE.
If attic combustion air is used, the inlet
air opening at the furnace must be
protected from accidental blockage.
Install a 90° elbow pointing horizontally
at the top of inlet air pipe. See Figure
11 (maximum of 2, 45° or 90° elbows,
allowed).
NOTE: Maximum length of pipe that
may be used for combustion air is 10
feet with two elbows. Lengths of more
IN LUDING
HORIZONTAL DIRE TION
ATTA H A 90° ELBOW TO TOP INLET AIR
OPENING TO PREVENT A IDENTAL BLO KAGE
OF INTAKE OPENING.
than 10 feet can result in nuisance
pressure switch trips.
CAUTION
!
PV
ELBOW
#8 S REWS
#8 S REW
METAL FLUE PIPE ONLY
10 FT. MAX.
12" MIN. FROM
TOP OF INSULATION
6" MINIMUM
LEARAN E
PV
OUPLER
EXHAUST
ATTI SPA E
INDOOR SPA E
INSULATION
CAUTION
!
USE OF SHEET METAL
AIR INTAKE PIPE INSTEAD
OF PVC MAY RESULT IN
NOISE ISSUES.

16
GENERAL INFORMATION
The furnace must be vented in
accordance with these instructions,
National Fuel Gas ode, ANSI Z223.1
and/or the Natural Gas Installation
ode, SA-B149.1 & .2 and
requirements or codes of the local utility
or other authority having jurisdiction.
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.
DRAFT INDUCER
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 13.
FAILURE TO FOLLOW THIS
WARNING CAN CAUSE
RECIRCULATION OF FLUE
PRODUCTS CAUSING CARBON
MONOXIDE POISONING
RESULTING IN PERSONAL INJURY
OR DEATH.
IMPORTANT APPLICATION
NOTES
When the furnace is used as a
replacement, the existing vent system
should be inspected to assure that
there are no obstructions, blockage, or
any signs of corrosion and is properly
sized for use with this furnace.
NOTE: When the vent table permits
more than one diameter of pipe for a
connector or vent, the smallest
permitted diameter must be used.
Vent pipe may be type “B-1,” either
rigid or suitable flexible construction
that carries a u.l. listing.
ommon venting is allowed with
vertical B-1 vent systems, and lined
masonry chimneys. Follow the National
Fuel Gas ode, ANSI Z223.1 and/or
the Natural Gas Installation ode,
SA-B149.1 & .2 for proper installation
practices.
NOTE: Follow combustion air
instructions as outlined in this manual.
Single wall vent connectors to “B-1
vent or masonry chimneys” may be
used under the guidelines of the
National Fuel Gas ode, ANSI Z223.1
and/or the Natural Gas Installation
ode, SA-B149.1 & .2.
The entire length of the vent
onne tor shall be readily
a essible for inspe tion, leaning
and repla ement.
WARNING
!
WARNING
!
FURNACE CATEGORY
INFORMATION
This furnace is shipped as a ategory I
type induced draft furnace. A ategory
Ifurnace operates with a nonpositive
vent pressure and has a vent gas
temperature at least 140°F above the
dew point of the vent gases. A
ategory Itype may be a draft hood
equipped furnace or have a fan
assisted combustion system (induced
draft). The inducer is used to pull flue
products through the combustion
chamber and as they leave the
furnace, most of the energy has been
dissipated. The buoyant effect of the
flue gases provides venting to the
outdoors.
During the off cycle, the inducer is off
and there is very little flow through the
vent, cooling the vent. During the on
cycle there is no dilution airflow, as
with a draft hood type furnace.
Although the vent heats up rapidly
without dilution air, the flue products
contain more water vapor, which
results in a higher dew point
temperature. It is most important that
you follow the guidelines in these
instructions to prevent the possible
formation of condensation in the
venting system.
As a ategory Ifurnace it may be
vented vertically with type B-1 vent
pipe and also may be common vented,
as described in these instructions.
FIGURE 12
ATTACHING TO DRAFT INDUCER COLLAR
VENTING
A0991-01

17
“B-1” VERTICAL VENTING
Type “B-1” vents must be installed in
accordance with the terms of their
listings and the vent manufacturer’s
instructions.
“B-1” vents must be supported and
spaced in accordance with their listings
and the manufacturer’s instructions. All
vents must be supported to maintain
their minimum clearances from
combustible material.
VERTICAL VENTING
Categorized
Furna e Vent
Input Size Required
50K 3”
75K *4”
100K *4”
125K *5”
150K *5”
*NOTE: All furnaces have a 3” vent
connection as shipped from the factory. A 3”
to 4” or 3” to 5” vent transition is required on
all but the 50,000 BTUH models when
vertically vented or common vented with
metal vent pipes. THE VENT TRANSITION
CONNECTION MUST BE MADE AT THE
FURNACE VENT EXIT. It must originate
with an adapter if required, at the furnace
flue collar and terminate either in a listed
cap or roof assembly. When common
venting, the vent connector size may differ
from the above diameters depending on
application. See ANSI Z21.47-1993/ SA-
2.3-M93 or latest edition tables.
VERTI AL VENT SYSTEMS:
1. A gas vent shall terminate above the
roof surface with a listed cap or
listed roof assembly. Gas vents 12
inches in size or smaller with listed
caps shall be permitted to be
terminated in accordance with
Figure 14, provided they are at least
8 feet from a vertical wall or similar
obstruction. All other gas vents shall
terminate not less than 2 feet above
the highest point where they pass
through the roof and at least 2 feet
higher than any portion of a building
within 10 feet.
2. A type B-1 gas vent shall terminate
at least 5 feet in vertical height
above the highest connected
equipment draft hood or flue collar.
3. Must rise 1/4” per foot away from the
furnace on horizontal runs and be
supported with straps or hangers so
it has no sags or dips. Supports at 4
foot intervals and at all elbows are
recommended.
4. The vent connector must be
mechanically fastened to the outlet
collar of the furnace with at least (2)
sheet metal screws except vent
connectors that are B-1 material.
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.
SPECIAL VENT SYSTEMS (SVS)
IMPORTANT: It is THE FURNACE
ANUFACTURER’s position now that
new installations of any HTPV pipe
used in a category III vent application,
including Selkirk’s Selvent™ II HTPV
product, should cease immediately.
These shall be assembled in
accordance with the manufacturer’s
instructions. See Figure 12.
5. Any angle greater than 45 degrees
from the vertical is considered
horizontal. The total horizontal
distance of a vent plus the horizontal
vent connector serving draft-hood
equipped appliances shall not be
greater than 75 percent of the
vertical height of the vent.
NOTE: Refer to the National Fuel Gas
ode, ANSI Z223.1 and/or the Natural
Gas Installation ode,
SA-B149.1 & .2.
Single appliance venting of a fan
assisted furnace into a tile-lined
masonry chimney is prohibited. The
chimney must be lined with either Type
B vent or with a listed, single wall,
metal lining system. Reference
National Fuel Gas ode, ANSI Z223.1
and/or the Natural Gas Installation
ode, SA-B149.1 & .2. See Figure 13
for typical B-1 vent chase.
FIGURE 13
TYPICAL VENTING WITH “B-1” VENT
WARNING
!

18
EXISTING VENT SYSTEMS
IMPORTANT RETROFIT
VENTING INSTRUCTIONS
If this furnace is a replacement
installation, ALWAYS INSPECT the
existing vent system to be sure there
are no obstructions, blockages, or
signs of corrosion.
When the existing furnace is removed
from a venting system serving other
appliances, the venting is likely to be
too large to properly vent the remaining
attached appliances.
The following steps shall be followed
with each appliance that remains
connected to the common venting
system, while the other appliances that
remain connected to the common
venting systems are not in operation.
NOTE: When the vent table permits
more than one diameter of pipe for a
onne tor or vent, the smallest
permitted diameter must be used.1.
Seal any unused openings in the
ommon venting system.
1. Visually inspect the venting system
for proper size and horizontal pitch
and determine that there is no
blockage, restriction, leakage,
corrosion or other deficiencies which
could cause an unsafe condition.
2. Insofar as is practical, close all
building doors, windows and all
doors between the space where the
appliances remaining connected to
FIGURE 14
DEDICATED VENTING THROUGH
CHIMNEY WITH “B-1” VENT
the common venting system are
located. 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 maximum speed.
Do not operate a summer exhaust
fan. lose fireplace dampers.
3. Follow the lighting instructions.
Place the appliance being inspected
into operation. Adjust the thermostat
so the appliance will operate
continuously.
4. Test for spillage at the draft hood
relief opening after 5 minutes of
main burner operation. Use the
flame of a match or candle, or
smoke from a cigarette, cigar, or
pipe.
5. After it has been determined that
each appliance that remains
connected to the common venting
system properly vents (when tested
as outlined above) return doors,
windows, exhaust fans, fireplace
dampers and any other gas-burning
appliance to their previous
conditions of use.
6. If improper venting is observed
during any of the above tests, the
common venting system must be
resized. Refer to National Fuel Gas
ode, ANSI Z223.1 and/or the
Natural Gas Installation ode,
SA-B149.1 & .2.
POWER VENT SYSTEMS
When vertical venting is not possible,
the only acceptable method for
horizontal venting is with the use of
Tjernlund model GPAK-1TR or Field
ontrols models SWG-4R power
venter. Type B vent pipe and fittings
must be used. ommon venting is not
permitted
All appli ation and installation
instru tions supplied with the power
venter must be followed.
Please address all questions regarding
power venter installation, agency
listings and furnace model compatibility
to:
Tjernlund Products, Inc.
[phone] or [phone]
Field ontrols L.L. .
[phone] or [phone]
CHIMNEY-FRIENDLY
ADAPTER SYSTEM
This furnace can be used with chimney
adapter RXGW-B01.

19
FIGURE 15
GAS PIPING INSTALLATION
GAS PIPE INSTALLATION
GAS SUPPLY AND PIPING
GAS SUPPLY
THIS FURNACE IS EQUIPPED AT
THE FACTORY FOR USE ON
NATURAL GAS ONLY. CONVERSION
TO LP GAS REQUIRES A SPECIAL
KIT AVAILABLE FROM THE
DISTRIBUTOR. FAILURE TO USE
THE PROPER CONVERSION KIT CAN
CAUSE FIRE, CARBON MONOXIDE
POISONING, EXPLOSION,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
See the onversion kit index supplied
with the furna e. This index identifies
the proper LP Gas Conversion Kit
required for ea h parti ular furna e.
IMPORTANT:Any additions, changes
or conversions required for the furnace
to satisfactorily meet the application
should be made by a qualified installer,
service agency or the gas supplier,
using factory-specified or approved
parts. In the commonwealth of
assachusetts, installation must be
performed by a licensed plumber or gas
fitter for appropriate fuel.
IMPORTANT:Connect this furnace only
to gas supplied by a commercial utility.
IMPORTANT:A U.L. recognized
fuel gas and CO detector(s) are
recommended in all applications,
and their installation should be in
accordance with the detector
manufacturer’s recommendations
and/or local laws, rules, regulations or
customs.
GAS PIPING (SEE FIGURE 15)
Install the gas piping according to all
local codes, state codes and regulations
of the utility company, whichever holds
jurisdiction.
If possible, run a separate gas supply
line directly from the meter to the
furnace. onsult the local gas company
for the location of the manual main shut-
off valve. The gas line and manual gas
valve must be adequate in size to
prevent undue pressure drop and
never smaller than the pipe size to
the ombination gas valve on the
furna e. Refer to Table 2 for the recom-
mended pipe size for natural gas and
Table 3 for LP gas pipe sizes.
IMPORTANT:It is permissible to run
flexible gas connector inside the unit to
a piece of black pipe. If local codes
!WARNING
allow the use of a flexible gas appliance
connector, always use a new listed
connector. Do not use a connector
which has previously serviced another
gas appliance. assachusetts law
limits flexible gas connectors to a
maximum of 36”.
Install a ground joint union outside
the abinet to easily remove the
ontrol valve assembly. Install a
manual shut-off valve in the gas line
outside the furna e asing. The valve
should be readily accessible to turn the
gas supply on or off. Install a drip leg in
the gas supply line as close to the
furnace as possible. Always use a pipe
compound resistant to the action of
liquefied petroleum gases on all
threaded connections.
IMPORTANT: When making gas pipe
connections, use a back-up wrench to
prevent any twisting of the control
assembly and gas valve. Do not
overtighten the connection.
Any strains on the gas valve can
change the position of the gas orifices
in the burners. This can cause erratic
furnace operation.
IMPORTANT:ENSURE that the
furnace gas control valve not be
subjected to high gas line supply
pressures.
DIS ONNE T the furnace and its
individual shut-off valve from the gas
supply piping during any pressure
testing that ex eeds 1/2 PSIG
(3.48 kPa).
GROMMET
(IN NORMAL POSITION)
GAS VALVE
MANIFOLD
MANIFOLD
FLAME SENSOR
FLAME
SENSOR
BURNERS
BURNERS
DIRE T SPARK
IGNITOR
DIRE T SPARK IGNITOR
MANUAL GAS VALVE (IN LOSED POSITION)
UNION
DU T
UNION
DRIP LEG
DRIP LEG
4 TO 5 FEET
ABOVE FLOOR
REQ'D BY SOME
UTILITIES
4 TO 5 FEET
ABOVE FLOOR
REQ'D BY SOME
UTILITIES
GROMMET
(IN NORMAL
POSITION)
U
UP PF FL LO OW W & & D DO OW WN NF FL LO OW W
H
HO OR RI IZ ZO ON NT TA AL L
MANUAL GAS VALVE
(IN LOSED POSITION)
GAS VALVE

20
LP CONVERSION
NOTE: For installation, see specific LP
kit installation instructions.
The valve can be converted to use
liquefied petroleum (LP) gas by
replacing the pressure regulator spring
with the conversion kit spring. This LP
kit spring allows the regulator to
maintain the proper adjusted manifold
pressure for LP gas. The correct burner
LP orifices are included in the kit.
NOTE: Order the correct LP conversion
kit from the local distributor. Furnace
conversion to LP gas must be
performed by a qualified technician.
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.
GAS PRESSURE
IMPORTANT: The maximum gas
supply pressure to the furnace should
be 10.5” w.c. for natural gas and 13”
w.c. for LP gas.
Natural gas supply pressure should
operate between 5" to 10.5” w.c. LP
gas supply pressure should be 11” to
13” w.c. This pressure must be
maintained with all other gas-fired
applian es in operation.
NOTE: Do not ex eed a gas pressure
of 13” w. .
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.
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.
To check for gas leakage, use an
approved chloride-free soap and water
solution, an electronic combustible gas
detector, or other approved method.
!WARNING
!CAUTION
!CAUTION
NOx MODELS
When converting furnaces equipped
with NOx inserts to LP gas, remove the
NOx insert assemblies. Steps for
removal are listed below:
1. Turn off all electrical power and the
gas supply to the furnace.
2. Remove the burner door from the
furnace.
3. Remove the igniter assembly –
handle with are.
4. Remove the two screws attaching
the NOx insert retainer brackets to
the center panel. Pull the retainer
rod.
5. Put the two screws back into the
holes in the center panel.
6. Re-install the igniter and burner
assemblies.
7. Replace burner door.
8. Turn on electrical power and gas
supply to the unit.
NOTE: Some NOx models may have
one less NOx insert.