Nature Air RGRM-04*MAES User manual

92-24161-84-01
SUPERSE ES 92-24161-84-00
INSTALLATION INSTRUCTIONS
OR UP LOW, DOWN LOW/HORIZONTAL HIGH
E ICIENCY CONDENSING TWO-STAGE GAS
URNACES
RGRM, RGTM SERIES
ISO 9001:2008
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.

INSTALLATION CHECK LIST
REFER TO INSTALLATION INSTRUCTIONS
GAS SUPPLY
______ Adequate pipe size
______ Correct supply pressure (during furnace operation)
______ Manifold pressure
______ No gas leaks
______ L.P. Kit Number (if applicable)
ELECTRICAL
______ 115 V.A.C. supply (Single Circuit)
______ Polarity observed
______ Furnace properly grounded
______ Adequate wire size
URNACE INSTALLATION
______ Adequate clearance to combustibles
______ Adequate clearance for service (at front)
DUCT STATIC PRESSURE
______ in. w.c. on heating speed
______ in. w.c. on cooling speed
______ Air temperature rise
CONDENSATE LINE
______ Trap filled with water
______ Vented
______ Sloped toward drain
______ Condensate drain line hoses connected
and clamped
______ Freeze protection (if necessary)
VENTING – DIRECT VENT
______ in. diameter – intake pipe
______ in. diameter – exhaust pipe
______ ft. of pipe – intake air
______ no. of elbows – intake air
______ ft. of pipe – exhaust pipe
______ no. of elbows – exhaust pipe
______ Exhaust Vent Temperature
TERMINATIONS – DIRECT VENT
VERTICAL
______ Intake – 12" min. above roof/snow level
______ Correct relationship – exhaust to intake
HORIZONTAL/VERTICAL – CONCENTRIC (RXGY-E03A)
______ Intake – 12" min. above roof/snow level
______ Intake “Y” rotated above center
______ Exhaust sloped toward furnace
HORIZONTAL – STANDARD (RXGY-D02, -D03) – US
(RXGY-D02A, RXGY-D03A) – CANADA
______ Correct relationship – exhaust to intake
______ 12" min. above grade/snow level
HORIZONTAL – ALTERNATE
(RXGY-D02, -D03 OR -D04) – US
(RXGY-D02A, -D03A, -D04A) – CANADA
______ Correct relationship – exhaust to intake
______ Above anticipated snow level
VENTING – NON-DIRECT VENT
______ in. diameter – exhaust pipe
______ ft. of pipe – exhaust
______ no. of elbows
TERMINATION – NON-DIRECT VENT
VERTICAL
______ 12" min. above roof/snow level
HORIZONTAL – STANDARD
______ 12" min. above grade/snow level
HORIZONTAL – ALTERNATE
______ Above anticipated snow level
_____________________________ Model Number
_____________________________ Serial Number
_____________________________ ate of Installation
2

3
CONTENTS
Safety Precautions ...................................................................................................1
Installation Check List ..............................................................................................2
General Information..................................................................................................4
Safety Information ....................................................................................................6
Location Requirements and Considerations ............................................................8
ucting ...................................................................................................................13
Venting and Combustion Air Piping .......................................................................15
Combustion and Ventilation Air..............................................................................17
Vent Pipe Installation..............................................................................................20
Condensate rain/Neutralizer................................................................................33
Gas Supply and Piping...........................................................................................37
Electrical Wiring......................................................................................................41
Accessories ............................................................................................................42
High Altitude Installations .......................................................................................43
Start-Up Procedures...............................................................................................44
Integrated Furnace Control and ECM Motor Settings............................................45
Air Flow...................................................................................................................48
Maintenance...........................................................................................................50
Troubleshooting......................................................................................................53
Wiring iagram.......................................................................................................55
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
warnings for products sold in California
that contain, or produce, any of over
600 listed chemicals known to the State
of California 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
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 and the State of
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.

NOTE: A load calculation must be
performed to properly determine the
required furnace BTU size for the
structure. Also, the duct must be properly
designed and installed for proper airflow.
Existing ductwork must be inspected for
proper size and sealed system. Proper
airflow is necessary for both user comfort
and equipment performance.
Before opening the furnace carton and
installation of the furnace, verify the data
tags on the carton and inside the
furnace, match and is what was ordered
from the local distributor. Also, check for
any damage to the furnace before
installation.
IMPORTANT: Proper application,
installation and maintenance of this
furnace and system is a must if
consumers are to receive the full benefits
for which they have paid.
The RGRM and RGTM series furnaces
are design-certified by CSA for use with
natural and propane gases as follows:
4
1. As non-direct vent central forced air
furnaces taking combustion air from
the installation area or using air
ducted from the outside.
2. As direct vent central forced air
furnaces with all combustion air
supplied directly to the furnace
burners through a special air intake
system outlined in these
instructions.Install this furnace in
accordance with the American
National Standard Z223.1 – latest
edition entitled “National Fuel Gas
Code” (NFPA54) and requirements
or codes of the local utilities or
other authorities having jurisdiction.
This is available from the following:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
GENERAL INFORMATION
IGURE 1
UP LOW URNACE COMPONENTS
25
26
ITEM
NO. PART NAME
1 CONDENSATE TRAP
2 DOOR SWITCH
3 JUNCTION BOX
4 TRANSFORMER
5 PRESSURE SWITCHES
6 EXHAUST TRANSITION
7 CONNECTOR
OUTLET AIR PIPE
9 SHIPPING PLUG (TO BE REMOVED)
10 FLAME SENSOR*
11 OVERTEMPERATURE SWITCH*
12 TOP PLATE
13 BURNER
14 IGNITER*
15 COMBUSTION AIR INLET
16 OPTIONAL AIR INLET (UPFLOW UNITS ONLY)
17 OPTIONAL GAS INLET
1 GAS VALVE
19 INDUCED DRAFT BLOWER
20 CAPACITOR*
21 BLOWER
22 LOW VOLTAGE TERMINAL
23 CONTROL MOUNTING PLATE
24 FILTER / SOLID METAL BASEPLATE
(UPFLOW UNITS ONLY)
25 POWER FACTOR CORRECTION CHOICE*
26 AIR CIRCULATING BLOWER*
*These components may be only partially visible in this photo.
NOTE: A PARTS BAG IS INCLU E WITH THE FURNACE. IF A NEW PARTS BAG NEE S TO BE OR ERE , USE THE FOLLOWING PART
NUMBERS: AS-100717-01 FOR -GRM-45, -GRM-60, -GRM-75, GRM-90 AN GRM-105 AS-100717-02 FOR -GRM-120.
AIR LOW
CSA-INTERNATIONAL
8501 East Pleasant Valley Road
Cleveland, Ohio 44131-5575
Install units in Canada in accordance
with CSA-B149, local installation
codes and authorities having
jurisdiction. CSA-B149 is available
from:
CSA-INTERNATIONAL
178 Rexdale Blvd.
Toronto, Ontario
Canada M9W, 1R3
NOTE: It is our recommendation that
any HVAC equipment which were
subject to flooding be replaced to
avoid any risk of property damage,
personal injury or death. Also, our
position that the immersion by flood
waters compromises any HVAC
products thus voiding this warranty.
DOWN LOW/HORIZONTAL URNACE COMPONENTS
9
8
4
17
11
25
10
18
5
19
20
21
2
315 12 23 22
7
1
14
6
13
AIR LOW

IMPROPER INSTALLATION, OR
INSTALLATION NOT MADE IN
ACCORDANCE WITH THE CSA
INTERNATIONAL (CSA)
CERTI ICATION OR THESE
INSTRUCTIONS, CAN RESULT IN
UNSATIS ACTORY OPERATION
AND/OR DANGEROUS CONDI-
TIONS AND ARE NOT COVERED BY
THE UNIT WARRANTY.
IN COMPLIANCE WITH
RECOGNIZED CODES, IT IS
RECOMMENDED THAT AN
AUXILIARY DRAIN PAN BE
INSTALLED UNDER ALL
EVAPORATOR COILS OR UNITS
CONTAINING EVAPORATOR COILS
THAT ARE LOCATED IN ANY AREA
O A STRUCTURE WHERE DAMAGE
TO THE BUILDING OR BUILDING
CONTENTS MAY OCCUR AS A
RESULT O AN OVER LOW O THE
COIL DRAIN PAN OR A STOPPAGE
IN THE PRIMARY CONDENSATE
DRAIN PIPING. SEE ACCESSORIES
SECTION O THESE INSTRUCTIONS
OR AUXILIARY HORIZONTAL
OVER LOW PAN IN ORMATION
(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.
• Check the unit rating plate for unit
size, electric heat, coil, voltage,
phase, etc. to be sure equipment
NOTICE
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
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 LEAKS CAN CREATE AN
UNBALANCED SYSTEM AND DRAW
POLLUTANTS SUCH AS DIRT,
DUST, UMES AND ODORS INTO
THE HOME CAUSING PROPERTY
DAMAGE. UMES AND ODORS
ROM TOXIC, VOLATILE OR
LAMMABLE 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 IGURE 2).
• I AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
GARAGES OR O -GARAGE
STORAGE AREAS - ALL JOINTS,
SEAMS, AND OPENINGS IN THE
EQUIPMENT AND DUCT MUST BE
SEALED TO LIMIT THE
MIGRATION O TOXIC UMES
AND ODORS INCLUDING CARBON
MONOXIDE ROM MIGRATING
INTO THE LIVING SPACE.
• I AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
SPACES CONTAINING UEL
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 O THE
SPACE AND POSSIBLE
MIGRATION O COMBUSTION
BYPRODUCTS INCLUDING
CARBON MONOXIDE INTO THE
LIVING SPACE.
NOTICE
WARNING
!
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.
IGURE 2
MIGRATION O DANGEROUS SUBSTANCES, UMES, AND ODORS INTO LIVING SPACES
5

!WARNING
!WARNING
!WARNING
!WARNING
SAFETY INFORMATION
COMBUSTION PRODUCTS MUST
BE DISCHARGED OUTDOORS.
CONNECT THIS URNACE TO AN
APPROVED VENT SYSTEM ONLY,
AS SPECI IED IN VENT PIPE
INSTALLATION SECTION O
THESE INSTRUCTIONS.
PROVIDE ADEQUATE
COMBUSTION AND VENTILATION
AIR TO THE URNACE SPACE AS
SPECI IED IN THE COMBUSTION
AND VENTILATION AIR SECTION
O THESE INSTRUCTIONS.
INSTALL THIS URNACE ONLY IN
A LOCATION AND POSITION AS
SPECI IED IN THE LOCATION
REQUIREMENTS AND
CONSIDERATIONS SECTION O
THESE INSTRUCTIONS. PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR TO THE
URNACE SPACE AS SPECI IED
IN THE VENTING SECTION O
THESE INSTRUCTIONS.
USE ONLY WITH TYPE O GAS
APPROVED OR THIS URNACE.
RE ER TO THE URNACE RATING
PLATE.
6
IMPORTANT!
THE COMMONWEALTH O
MASSACHUSETTS REQUIRES
COMPLIANCE WITH REGULATION
248 CMR 4.00 AND 5.00 OR
INSTALLATION O THROUGH-
THE-WALL VENTED GAS
APPLIANCES AS OLLOWS:
(a) For all side wall horizontally
vented gas fueled equipment installed
in every dwelling, building or structure
used in whole or in part for residential
purposes, including those owned or
operated by the Commonwealth and
where the side wall exhaust vent
termination is less than seven (7) feet
above finished grade in the area of
the venting, including but not limited
to decks and porches, the following
requirements shall be satisfied:
1. INSTALLATION O CARBON
MONOXIDE DETECTORS. At the
time of installation of the side wall
horizontal vented gas fueled
equipment, the installing plumber or
gasfitter shall observe that a hard
wired carbon monoxide detector with
an alarm and battery back-up is
installed on the floor level where the
gas equipment is to be installed. In
addition, the installing plumber or
gasfitter shall observe that a battery
operated or hard wired carbon
monoxide detector with an alarm is
installed on each additional level of
the dwelling, building or structure
served by the side wall horizontal
vented gas fueled equipment. It shall
be the responsibility of the property
owner to secure the services of
qualified licensed professionals for
the installation of hard wired carbon
monoxide detectors.
a. In the event that the side wall
horizontally vented gas fueled
equipment is installed in a crawl
space or an attic, the hard wired
carbon monoxide detector with alarm
and battery back-up may be installed
on the next adjacent floor level.
b. In the event that the requirements
of this subdivision can not be met at
the time of completion of installation,
the owner shall have a period of thirty
(30) days to comply with the above
requirements; provided, however, that
during said thirty (30) day period, a
battery operated carbon monoxide
detector with an alarm shall be
installed.
2. APPROVED CARBON
MONOXIDE DETECTORS. Each
carbon monoxide detector as required
in accordance with the above
provisions shall comply with NFPA
720 and be ANSI/UL 2034 listed and
IAS certified.
3. SIGNAGE. A metal or plastic
identification plate shall be
permanently mounted to the exterior
of the building at a minimum height of
eight (8) feet above grade directly in
line with the exhaust vent terminal for
the horizontally vented gas fueled
heating appliance or equipment. The
sign shall read, in print size no less
than one-half (1/2) inch in size, “GAS
VENT DIRECTLY BELOW. KEEP
CLEAR O ALL OBSTRUCTIONS”.
4. INSPECTION. The state or local
gas inspector of the side wall
horizontally vented gas fueled
equipment shall not approve the
installation unless, upon inspection,
the inspector observes carbon
monoxide detectors and signage
installed in accordance with the
provisions of 248 CMR 5.08(2)(a) 1
through 4.
(b) EXEMPTIONS: The following
equipment is exempt from 248 CMR
5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10
entitled “Equipment Not Required To
Be Vented” in the most current edition
of NFPA 54 as adopted by the Board;
and
2. Product Approved side wall
horizontally vented gas fueled
equipment installed in a room or
structure separate from the dwelling,
building or structure used in whole or
in part for residential purposes.
(c) MANUFACTURER
REQUIREMENTS – GAS
EQUIPMENT VENTING SYSTEM
PROVI E . When the manufacturer
of Product Approved side wall
horizontally vented gas equipment
provides a venting system design or
venting system components with the
equipment, the instructions provided
by the manufacturer for installation of
the equipment and the venting
system shall include:
1. etailed instructions for the
installation of the venting system
design or the venting system
components; and
2. A complete parts list for the venting
system design or venting system.
(d) MANUFACTURER
REQUIREMENTS – GAS
EQUIPMENT VENTING SYSTEM
NOT PROVI E . When the
manufacturer of a Product Approved
side wall horizontally vented gas
fueled equipment does not provide
the parts for venting the flue gases,
but identifies “special venting
systems”, the following requirements
shall be satisfied by the manufacturer:
1. The referenced “special venting
system” instructions shall be included
with the appliance or equipment
installation instructions; and
2. The “special venting systems” shall
be Product Approved by the Board,
and the instructions for that system
shall include a parts list and detailed
installation instructions.
(e) A copy of all installation
instructions for all Product Approved
side wall horizontally vented gas
fueled equipment, all venting
instructions, all parts lists for venting
instructions, and/or all venting design
instructions shall remain with the
appliance or equipment at the
completion of the installation.

!WARNING
!WARNING
DO NOT OPERATE THE SYSTEM
WITHOUT ILTERS. A PORTION
O THE DUST ENTRAINED IN THE
AIR MAY TEMPORARILY LODGE
IN THE AIR DUCT RUNS AND AT
THE SUPPLY REGISTERS. ANY
CIRCULATED DUST PARTICLES
WILL BE HEATED AND CHARRED
BY CONTACT WITH THE
URNACE HEAT EXCHANGER.
THIS SOOTY RESIDUE WILL SOIL
CEILINGS, WALLS, DRAPES,
CARPETS AND OTHER
HOUSEHOLD ARTICLES. SOOT
DAMAGE MAY ALSO RESULT
WITH, OR WITHOUT, ILTERS IN
PLACE, WHEN CERTAIN TYPES
O CANDLES ARE BURNED, OR
CANDLEWICKS ARE LE T
UNTRIMMED.
DO NOT INSTALL THIS URNACE
IN A MOBILE HOME!! THIS
URNACE IS NOT APPROVED OR
INSTALLATION IN A MOBILE
HOME. DOING SO COULD CAUSE
IRE, PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
NOTICE
NOTICE
7
!WARNING
NEVER TEST OR GAS LEAKS
WITH AN OPEN LAME. USE A
COMMERCIALLY AVAILABLE
SOAP SOLUTION MADE
SPECI ICALLY OR THE
DETECTION O LEAKS TO CHECK
ALL CONNECTIONS, AS
SPECI IED IN GAS SUPPLY AND
PIPING SECTION O THESE
INSTRUCTIONS.
!WARNING
ALWAYS INSTALL URNACE TO
OPERATE WITHIN THE
URNACE'S INTENDED
TEMPERATURE-RISE RANGE
WITH A DUCT SYSTEM WHICH
HAS AN EXTERNAL STATIC
PRESSURE WITHIN THE
ALLOWABLE RANGE, AS
SPECI IED IN DUCTING SECTION
O THESE INSTRUCTIONS. SEE
ALSO URNACE RATING PLATE.
!WARNING
WHEN A URNACE IS INSTALLED
SO THAT SUPPLY DUCTS CARRY
AIR CIRCULATED BY THE
URNACE TO AREAS OUTSIDE
THE SPACE CONTAINING THE
URNACE, THE RETURN AIR
SHALL ALSO BE HANDLED BY
DUCT(S) SEALED TO THE
URNACE CASING AND
TERMINATING OUTSIDE THE
SPACE CONTAINING THE
URNACE.
!WARNING
WHEN THIS URNACE 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
LOOR. THIS IS TO REDUCE THE
RISK O IGNITING LAMMABLE
VAPORS WHICH MAY
BE PRESENT IN A GARAGE.
ALSO, THE URNACE MUST BE
LOCATED OR PROTECTED TO
AVOID PHYSICAL DAMAGE BY
VEHICLES. AILURE TO OLLOW
THESE WARNINGS CAN CAUSE A
IRE OR EXPLOSION, RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
!WARNING
THE URNACE MAY BE USED
OR HEATING O BUILDINGS OR
STRUCTURES UNDER
CONSTRUCTION.
INSTALLATION MUST COMPLY
WITH ALL INSTALLATION
INSTRUCTIONS INCLUDING:
• PROPER VENT INSTALLATION;
• URNACE OPERATING UNDER
THERMOSTATIC CONTROL;
• RETURN AIR DUCT SEALED TO
THE URNACE;
• AIR ILTERS IN PLACE;
• SET URNACE INPUT RATE
AND TEMPERATURE RISE PER
RATING PLATE MARKING;
• MEANS OR PROVIDING
OUTDOOR AIR REQUIRED OR
COMBUSTION;
• RETURN AIR TEMPERATURE
MAINTAINED BETWEEN 55°
(13°C) AND 80° (27°C); AND
• CLEAN URNACE, DUCT
WORK AND COMPONENTS
UPON SUBSTANTIAL
COMPLETION O THE
CONSTRUCTION PROCESS,
AND VERI Y URNACE
OPERATING CONDITIONS
INCLUDING IGNITION, INPUT
RATE, TEMPERATURE RISE
AND VENTING, ACCORDING TO
THE INSTRUCTIONS AND
CODES.
!WARNING
DUCT LEAKS CAN CREATE AN
UNBALANCED SYSTEM AND
DRAW POLLUTANTS SUCH AS
DIRT, DUST, UMES AND ODORS
INTO THE HOME CAUSING
PROPERTY DAMAGE. UMES
AND ODORS ROM TOXIC,
VOLATILE OR LAMMABLE
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 IGURE
2).
• I AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
GARAGES OR O -GARAGE
STORAGE AREAS - ALL JOINTS,
SEAMS, AND OPENINGS IN THE
EQUIPMENT AND DUCT MUST
BE SEALED TO LIMIT THE
MIGRATION O TOXIC UMES
AND ODORS INCLUDING
CARBON MONOXIDE ROM
MIGRATING INTO THE LIVING
SPACE.
• I AIR-MOVING EQUIPMENT OR
DUCTWORK IS LOCATED IN
SPACES CONTAINING UEL
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 O THE
SPACE AND POSSIBLE
MIGRATION O COMBUSTION
BYPRODUCTS INCLUDING
CARBON MONOXIDE INTO THE
LIVING SPACE.
IMPROPER INSTALLATION, OR
INSTALLATION NOT MADE IN
ACCORDANCE WITH THE CSA
INTERNATIONAL (CSA)
CERTI ICATION OR THESE
INSTRUCTIONS, CAN RESULT IN
UNSATIS ACTORY OPERATION
AND/OR DANGEROUS CONDI-
TIONS AND ARE NOT COVERED
BY THE UNIT WARRANTY.
IN COMPLIANCE WITH
RECOGNIZED CODES, IT IS
RECOMMENDED THAT AN
AUXILIARY DRAIN PAN BE
INSTALLED UNDER ALL
EVAPORATOR COILS OR UNITS
CONTAINING EVAPORATOR
COILS THAT ARE LOCATED IN
ANY AREA O A STRUCTURE
WHERE DAMAGE TO THE
BUILDING OR BUILDING
CONTENTS MAY OCCUR AS A
RESULT O AN OVER LOW O
THE COIL DRAIN PAN OR A
STOPPAGE IN THE PRIMARY
CONDENSATE DRAIN PIPING.
SEE ACCESSORIES SECTION O
THESE INSTRUCTIONS OR
AUXILIARY HORIZONTAL
OVER LOW PAN IN ORMATION
(MODEL RXBM).

GENERAL INFORMATION
DO NOT INSTALL THIS URNACE
IN A MOBILE HOME!! This furnace
is not approved for installation in a
mobile home. oing so could cause
IRE, PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
WHEN THIS URNACE 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
LOOR. THIS IS TO PREVENT
THE RISK O IGNITING
LAMMABLE VAPORS WHICH
MAY BE PRESENT IN A GARAGE.
ALSO, THE URNACE MUST BE
LOCATED OR PROTECTED TO
AVOID PHYSICAL DAMAGE BY
VEHICLES. AILURE TO OLLOW
THESE WARNINGS CAN CAUSE A
IRE OR EXPLOSION, RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
1. IMPORTANT: If installing the unit
over a finished ceiling or living
area, be certain to install an
auxiliary condensate drain pan
under the entire unit. This
auxiliary drain pan should extend
under any evaporator coil
installed with the furnace and the
open portion of the condensate
drain assembly. See
“Condensate rain/Neutralizer”
section for more details.
2. IMPORTANT: If using a cooling
evaporator coil with this furnace,:
a. be sure the air passes over
the heat exchanger before
passing over the cooling
coil. The cooled air passing
over the warm ambient air
inside the heat exchanger
tubes can cause
condensation inside the tubes
resulting in corrosion and
eventual failure.
or
b. install a parallel duct system
to divert all the air from the
furnace allowing it to pass
over the cooling coil only. Use
dampers or other means to
prevent chilled air from
passing over the heat
exchanger.
If these are manual dampers, they
must be equipped to prevent heating
or cooling operation unless the
damper is in the full heat or cool
position.
3. IMPORTANT: Install the furnace
level. If it is not level, condensate
cannot drain properly, possibly
causing furnace shut down.
NOTE: These furnaces are approved
for installation in attics, as well as
alcoves, utility rooms, closets and
crawlspaces. Provisions must be
made to prevent freezing of
condensate.
4. IMPORTANT: If this furnace is
installed in a garage, attic and/or
any unconditioned space, install a
self-regulating heat tape around
the condensate trap and along the
entire length of the condensate
drain in the unconditioned space.
When the condensing horizontal
gas furnace is installed in an
unconditioned space where the
temperature would be capable of
reaching close to or below 32°F
!WARNING
!WARNING
(0°C), a self-regulating heat tape
is required on the condensate
drain, along with an insulation
wrap. The heat tape should meet
the following requirements:
a. The heat tape must be UL
listed.
b. The heat tape must be
installed per the
manufacturer’s instructions for
the entire length of drain pipe
in the unconditioned space.
c. The heat tape should be rated
at 5 or 6 watts per foot at
120V. See Figure 3.
IMPORTANT: Support this unit
when installed. Since this furnace
is suitable for attic or crawl space
installation, it may be installed on
combustible wood flooring or by
using support brackets.
5. 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.
c. allow service clearance
LOCATION REQUIREMENTS AND CONSIDERATIONS
8
IGURE 3
HORIZONTAL URNACE W/HEAT TAPE ON CONDENSATE TRAP
I526
RAIN
PIPE
HEAT
TAPE
TRAP
AIR LOW

Upflow furnaces are shipped with a
bottom closure panel installed.
When bottom return air is used,
remove the panel by removing the
two screws attaching the panel to
the front base angle. See filter
section for details.
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE URNACE JACKET. THE
AREA AROUND THE URNACE
MUST BE KEPT CLEAR AND REE
O ALL COMBUSTIBLE
MATERIALS INCLUDING
GASOLINE AND OTHER
LAMMABLE VAPORS AND
LIQUIDS. PLACEMENT O
COMBUSTIBLE MATERIALS ON,
AGAINST OR AROUND THE
URNACE JACKET CAN CAUSE
AN EXPLOSION OR IRE
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE HOMEOWNER
SHOULD BE CAUTIONED THAT
THE URNACE AREA MUST NOT
BE USED AS A BROOM CLOSET
OR OR ANY OTHER STORAGE
PURPOSES.
CLEARANCE -
ACCESSIBILITY
The design of forced air furnaces with
input ratings as listed in the tables
under Figures 5, 6, 7 are certified by
CSA-International 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.
NOTE: Use recommended 24”
clearance if accessibility clearances
are greater than fire protection
clearances.
UP LOW URNACES ARE DESIGN-
CERTI IED OR INSTALLATION
ON COMBUSTIBLE LOORS.
NOTE, HOWEVER, THAT
URNACES MUST NOT BE
INSTALLED DIRECTLY ON
CARPETING, TILE OR OTHER
COMBUSTIBLE MATERIAL OTHER
THAN WOOD LOORING.
INSTALLATION ON A
COMBUSTIBLE MATERIAL CAN
RESULT IN IRE, CAUSING
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
!WARNING
THIS URNACE IS NOT
APPROVED OR RECOMMENDED
OR INSTALLATION ON ITS BACK,
WITH ACCESS DOORS ACING
UPWARDS OR IN ANY
HORIZONTAL CON IGURATION.
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 get 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.
See Figure 4.
4. Locate the furnace to maintain
proper clearance to combustibles
as shown in following Figures 5,
6, 7.
DO NOT LI T THE UNIT BY THE
HEAT EXCHANGER TUBES.
DOING SO CAN DAMAGE THE
HEAT EXCHANGER ASSEMBLY.
!WARNING
CAUTION
!
!WARNING
9
IGURE 4
HORIZONTAL URNACE INSTALLED W/SUPPORT BRACKETS
GAS
PIPE
TRAP
EXHAUST
FAN
ELECTRICAL
CON UIT
INTAKE
VENT
I522
AIR LOW

10
IGURE 5
CLEARANCE TO COMBUSTIBLES, UP LOW UNITS
I392
UPFLOW MODELS MINIMUM CLEARANCE (IN.)
LEFT RIGHT SHIP
MODEL A B C D E F SIDE SIDE BACK TOP FRONT VENT
WGTS
04 171/21611/32 155/82 15 1325/32 00012*0 111 06 171/21611/32 155/82 15 1325/32 00012*0 117
07A 171/21611/32 155/82 15 1325/32 00012*0 123 07B 21 1927/32 191/82 181/2179/32 00012*0 145
09 21 1927/32 191/82 181/2179/32 00012*0 148 10 21 1927/32 191/82 181/2179/32 00012*0 152 12 241/22311/32 225/82 22 2025/32 00012*0 160
*A s rvic cl aranc of at l ast 24 inch s is r comm nd d in front of all furnac s.
SUPPLY
AIR
RETURN
AIR
AIR LOW
OPTIONAL RETURN AIR
CUTOUT (EITHER SIDE)*
*BOTH SIDES OR 1800 C M
OPTIONAL
RETURN
AIR CUTOUT
(EITHER SI E)*
I392. GN
2 DIA. KNOCKOUT
ALT. GAS CONNECTION
267⁄16
275⁄8
2 DIA.
GAS CONNECTION

11
IGURE 6
CLEARANCE TO COMBUSTIBLES, DOWN LOW UNITS
I393
DOWNFLOW MODELS MINIMUM CLEARANCE (IN.)
LEFT RIGHT SHIP
MODEL A B C D E F SIDE SIDE BACK TOP FRONT VENT
WGTS
06 171⁄21611⁄32 155⁄82 165⁄8137⁄800012*0 117
07A 171⁄21611⁄32 155⁄82 165⁄8137⁄800012*0 123 07B 21 1927/32 193/16 2 181/2179/32 00012*0 123
09 21 1927⁄32 193⁄16 2 201⁄8173⁄800012*0 148 10 21 1927⁄32 193⁄16 2 201⁄8173⁄800012*0 152 12 241⁄22311⁄32 225⁄82 235⁄8207⁄800012*0 160
*A s rvic cl aranc of at l ast 24 inch s is r comm nd d in front of all furnac s.
NOTE: IN OWNFLOW CONFIGURATION, RETURN AIR CUTOUT IS NOT PERMITTE .
AIR LOW
SUPPLY
AIR
RETURN
AIR
A103501. GN
2 DIA.
ALT. GAS CONNECTION
2513⁄16
43⁄8
2 DIA.
GAS
CONNECTION

12
IGURE 7
CLEARANCE TO COMBUSTIBLES, HORIZONTAL UNITS
I520
HORIZONTAL MODELS MINIMUM CLEARANCE (IN.)
LEFT RIGHT SHIP
MODEL A B C D E F SIDE SIDE BACK TOP FRONT VENT
WGTS
06 171⁄21611⁄32 155⁄82 165⁄8137⁄800012*0 117
07A 171⁄21611⁄32 155⁄82 165⁄8137⁄800012*0 123 07B 21 1927⁄32 193⁄16 2 201⁄8173⁄800012*0 123
09 21 1927⁄32 193⁄16 2 201⁄8173⁄800012*0 148 10 21 1927⁄32 193⁄16 2 201⁄8173⁄800012*0 152 12 241⁄22311⁄32 225⁄82 235⁄8207⁄800012*0 160
*A s rvic cl aranc of at l ast 24 inch s is r comm nd d in front of all furnac s.
NOTE: In horizontal configuration, return air cutout is not permitted.
Horizontal left-hand airflow only.
IMPORTANT: This furnace is not approved or recommended for
installation on its back, with access doors facing upwards.
AIR LOW
DRAIN TRAP LOCATION
SUPPLY
AIR
RETURN AIR
A103601. GN
2 DIA.
GAS CONNECTION
2 DIA. ALT. GAS CONNECTION
43⁄8
2513⁄16

1313
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 if summer air
conditioning is used.
SOME HEATING AIR LOW
VALUES MAY BE HIGHER THAN
THOSE REQUIRED OR COOLING.
BE SURE TO SIZE DUCT OR THE
MAXIMUM POSSIBLE AIR LOW
VALUE.
Size the ducts according to
acceptable industry standards and
methods. The total static pressure
drop of the air distribution system
should not exceed 0.5" w.c.
NEVER ALLOW THE PRODUCTS
O COMBUSTION ROM THE
LUE TO ENTER THE RETURN AIR
DUCTWORK OR THE CIRCULATED
AIR SUPPLY. ALL RETURN
DUCTWORK MUST BE
ADEQUATELY SEALED AND
SECURED TO THE URNACE
WITH SHEET METAL SCREWS;
AND JOINTS, TAPED. ALL OTHER
DUCT JOINTS MUST BE SECURED
WITH APPROVED CONNECTIONS
AND SEALED AIRTIGHT. WHEN
AN UP LOW URNACE IS
MOUNTED ON A PLAT ORM WITH
RETURN THROUGH THE BOTTOM,
IT MUST BE SEALED AIRTIGHT
BETWEEN THE URNACE AND
THE RETURN AIR PLENUM. THE
LOOR OR PLAT ORM MUST
PROVIDE SOUND PHYSICAL
SUPPORT O THE URNACE
WITHOUT SAGGING, CRACKS, OR
GAPS, AROUND THE BASE,
PROVIDING A SEAL BETWEEN
THE SUPPORT AND THE BASE.
AILURE TO PREVENT
PRODUCTS O COMBUSTION
ROM 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 ROM ANY OTHER HEAT
PRODUCING DEVICE SUCH AS A
IREPLACE INSERT, STOVE, ETC.
DOING SO MAY RESULT IN IRE,
CARBON MONOXIDE POISONING,
EXPLOSION, PERSONAL INJURY
OR PROPERTY DAMAGE.
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
AN STATIC PRESSURE.
IMPORTANT: When using outside air,
design and adjust the system to maintain
a return air temperature ABOVE 55° F
during the heating season.
NOTE: Return air grilles and warm air
registers must not be obstructed or
closed.
UP LOW UNITS
1. Position the unit to minimize long
runs of duct or runs of duct with
many turns and elbows.
2. Open the return air compartment.
UP LOW URNACE: A SOLID METAL
BASE PLATE MUST REMAIN IN THE
URNACE BOTTOM WHEN USING
SIDE AIR RETURN. AILURE TO
INSTALL A BASE PLATE COULD
CAUSE THE PRODUCTS O
COMBUSTION TO CIRCULATE INTO
THE LIVING SPACE AND CREATE
POTENTIALLY HAZARDOUS
CONDITIONS, INCLUDING CARBON
MONOXIDE POISONING OR DEATH.
OR BOTTOM RETURN, REMOVE
SOLID METAL BASE PLATE.
a. Cut an opening in the side. The
opening should be cut the full
width and height of the knockouts
on the unit. See Figure 8.
NOTE: Where the maximum air flow
is 1800 CFM or more, both sides or
the bottom must be used for return
air.
3. Connect the return duct or return
air cabinet to the unit. Make the
connection air tight to prevent
entraining combustion gases
from an adjacent fuel-burning
appliance.
4. Be sure to have adequate
space for the unit filter.
NOTE: O NOT take return air
from bathrooms, kitchens,
furnace rooms, garages, utility or
laundry rooms, or cold areas.
NOTE: O NOT use a rear air
return.
5. 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.
6. Connect the supply air plenum to
the furnace plenum opening.
IMPORTANT: If a flexible duct
connector must be used, it
MUST be rated for a minimum
temperature of 250°F.
continuous.
!WARNING
!WARNING
IGURE 8
UP LOW CUTOUT AND DRILL IN ORMATION
JACKET
DRILL (2)
3/16" DIA.
HOLES
8.000
4.875
1.531
!WARNING

14
DOWN LOW UNITS
1. Position the unit to minimize long
runs of duct or runs of duct with
many turns and elbows.
2. 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.
3. If installing on a combustible floor
and not using an air
conditioning plenum, install the
special non-combustible floor
base. See Table 1 and Figure 9.
THE DOWN LOW URNACE
DESIGN IS CERTI IED OR
INSTALLATION ON A NON-
COMBUSTIBLE LOOR. USE THE
SPECIAL BASE SPECI IED ON
THE URNACE CLEARANCE
LABEL. AILURE TO INSTALL THE
SPECIAL BASE MAY RESULT IN
IRE, PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
THIS SPECIAL BASE IS SHIPPED
ROM THE ACTORY AS AN
ACCESSORY.
4. Connect the furnace to the
supply air plenum.
5. Connect 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: In downflow
configuration, return air cut out is
not permitted.
6. Be sure to have adequate
space for the unit filter.
NOTE: O NOT take return air
from bathrooms, kitchens, furnace
rooms, garages, utility or laundry
rooms, or cold areas.
HORIZONTAL UNIT
IMPORTANT: THIS URNACE MAY
ONLY BE INSTALLED SO AS WHEN
ACING THE RONT O THE
URNACE, SUPPLY AIR IS
DISCHARGED ON THE LE T HAND
SIDE.
1. Position the unit to minimize long
runs of duct or runs of duct with
many turns and elbows.
2. 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.
3. Connect the furnace to the supply
air plenum.
4. Connect the return air ducting to
the return air opening at the right
end of the unit. Make the
connection air tight to prevent
pulling combustion gases from an
adjacent fuel-burning appliance.
NOTE: In horizontal configuration,
return air cut out is not permitted.
5. Be sure to have adequate space
for the unit filter.
NOTE: O NOT take return air
from bathrooms, kitchens, furnace
rooms, garages, utility or laundry
rooms, or cold areas.
!WARNING
IGURE 9
NON-COMBUSTIBLE LOOR BASE
TABLE 1
NON-COMBUSTIBLE LOOR BASES
loor Base Size
No. Cabinet
(-)XGC-B17 17
(-)XGC-B21 21
(-)XGC-B24 24

15
GENERAL INFORMATION
READ AND OLLOW ALL
INSTRUCTIONS IN THIS SECTION.
AILURE TO PROPERLY VENT
THIS URNACE CAN CAUSE
CARBON MONOXIDE POISONING
OR AN EXPLOSION OR IRE,
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.
This furnace removes both sensible
and latent heat from the combustion
flue gases. Removal of latent heat
results in condensation of flue gas
water vapor. This condensed water
vapor drains from the secondary heat
exchanger and out of the unit into a
drain trap.
When installed as a non-direct vent
furnace, only exhaust piping is
required and inside combustion air
may be used. Refer to section on
“
COMBUSTION & VENTILATION AIR
FOR FURNACE INSTALLATIONS.”
irect vent installations require a
dedicated combustion air and venting
system. All air for combustion is taken
from the outside atmosphere and all
combustion products are discharged
to the outdoors.
The combustion air and vent pipe
fittings must conform to American
National Standards Institute (ANSI)
and American Society for Testing
Materials (ASTM) standards
1785 (Schedule 40 PVC), 2665
(PVC- WV), 2241 (S R-21 and
S R26-26 PVC), 2661 (ABS- WV)
or F628 (Schedule 40 ABS- WV).
IN CANADA, PRODUCTS
CERTI IED OR INSTALLATION
AND INTENDED TO BE VENTED
WITH PLASTIC VENT SYSTEMS
(PVC, CPVC) MUST USE VENT
SYSTEMS THAT ARE CERTI IED
TO THE STANDARD OR TYPE BH
GAS VENTING SYSTEMS, ULC
S636.
THE COMPONENTS O THE
CERTI IED MATERIAL MUST NOT
BE INTERCHANGED WITH OTHER
VENT SYSTEMS OR UNLISTED
PIPE/ ITTINGS.
PLASTIC COMPONENTS AND
SPECI IED PRIMERS AND GLUES
O THE CERTI IED SYSTEM MUST
BE ROM A SINGLE SYSTEM
MANU ACTURER AND NOT
INTERMIXED WITH OTHER
SYSTEM MANU ACTURER’S
PARTS.
NOTE: INLET AIR PIPING IS NOT
CONSIDERED TO BE A PART O
THE “VENTING SYSTEM”. THE
REQUIREMENT THAT VENT
MATERIAL BE CERTI IED TO ULC
S636 DOES NOT APPLY TO INLET
AIR PIPING.
IMPORTANT: The plastic combustion
air and venting components are of
Schedule 40 PVC. If using ABS
piping, ensure that the solvent
cement is compatible for joining PVC
to ABS components or use a
mechanical connection that can
withstand the vent temperatures and
is corrosion resistant.
NOTE: Schedule 40 ABS- WV pipe
and fittings may be used as an
alternate to PVC pipe for the
combustion air inlet and vent pipes.
NOTE: Cellular core PVC is also
approved for use. It must be schedule
40PVC- WV cellular pipe for non-
pressure applications and
manufactured under ASTM F-891.
NOTE: With the furnace correctly
vented, the inducer will move
approximately 25 cfm per 100,000
Btu’s.
IMPORTANT: No part of the
combustion air and vent pipes may
run under ground.
OVERTEMPERATURE
SAFETY SWITCHES
Furnaces are equipped with safety
switches in the control compartment
to protect against overtemperature
conditions caused by inadequate
combustion air supply. The switches
are located in the burner
compartment. If a switch is tripped it
must be manually reset.
DO NOT JUMPER THESE
DEVICES! I ONE O THESE
SWITCHES SHOULD TRIP, A
QUALI IED INSTALLER, SERVICE
AGENCY OR THE GAS SUPPLIER
MUST BE CALLED TO CHECK
AND/OR CORRECT OR
ADEQUATE COMBUSTION AIR
SUPPLY. DO NOT RESET THE
SWITCHES WITHOUT TAKING
CORRECTIVE ACTION TO ASSURE
THAT AN ADEQUATE SUPPLY O
COMBUSTION AIR IS MAINTAINED
UNDER ALL CONDITIONS O
OPERATION. AILURE TO DO SO
CAN RESULT IN CARBON
MONOXIDE POISONING OR
DEATH. I THIS UNIT IS MOUNTED
IN A CLOSET, THE DOOR MUST
BE CLOSED WHEN MAKING THIS
CHECK.
REPLACE THESE SWITCHES
ONLY WITH THE IDENTICAL
REPLACEMENT PART.
EXISTING VENT SYSTEMS
When the installation of this furnace
replaces an existing furnace that is
removed from a vent system serving
other appliances, the vent system is
likely to be too large to properly vent
the remaining attached appliances.
The following steps should be
followed with each appliance
remaining connected to the original
common vent system. Place the
appliance to be tested in operation,
while the other appliances remaining
connected to the common vent
system are not in operation. Test the
operation of each appliance
individually by the following method.
1. Permanently seal any unused
openings in the common venting
system.
2. 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.
3. If practical, close all building
doors, windows and all doors
between the space where the
appliances remaining connected
to 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. o not operate a summer
exhaust fan. Close fireplace
dampers.
4. Follow the lighting instructions.
Place the appliance being
inspected into operation. Adjust
the thermostat so the appliance
will operate continuously.
5. 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.
VENTING AND COMBUSTION AIR PIPING
!WARNING
!WARNING !WARNING

16
1. Cut pipe end square. Chamfer
edge of pipe. Clean fitting socket
and pipe joint area of all dirt,
grease and moisture.
2. After checking pipe and socket
for proper fit, wipe socket and
pipe with cleaner-primer. Apply
a liberal coat of primer to inside
surface of socket and outside of
pipe. Read instructions included
with the primer for proper
application.
3. Apply a thin coat of cement
evenly in the socket. Quickly
apply a heavy coat of cement to
the pipe end and insert pipe into
fitting with a slight twisting
movement until it bottoms out.
NOTE: Cement must be fluid; if
not, recoat.
4. Hold the pipe in the fitting for 30
seconds to prevent the tapered
socket from pushing the pipe out
of the fitting.
5. Wipe all excess cement from the
joint with a rag. Allow 15 minutes
before handling. Cure time varies
according to fit, temperature and
humidity.
NOTE: Stir the solvent cement
frequently while using. Use a natural
bristle brush or the dauber supplied
with the can. The proper brush size is
one inch.
IMPORTANT: For Proper Installation
O NOT use solvent cement that
has become curdled, lumpy or
thickened.
O NOT thin. Observe shelf
precautions printed on containers.
For application below 32°F, use only
low-temperature-type solvent
cement.
6. 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.
7. If improper venting is observed
during any of the above tests, the
common venting system must be
resized.
When the furnace is installed in the
same space with other gas
appliances such as a water heater, be
sure there is an adequate supply of
combustion and ventilation air for the
other appliances. o not delete or
reduce the combustion air supply
required by the other gas appliances
in this space. See Z223.1, National
Fuel Gas Code (NFPA54) for
determining the combustion air
requirements for gas appliances. An
unconfined space must have at least
50 cubic feet (volume) for each
1,000 BTUH of the total input of all
appliances in the space. If the open
space containing the appliances is in
a building with tight construction
(contemporary construction), outside
air may still be required for the
appliances to burn and vent properly.
Outside air openings should be sized
the same as for a confined space.
IMPORTANT: Only the current vent
instructions apply. All 90 Plus Gas
Furnaces cannot be common vented.
JOINING PIPE AND
FITTINGS
PVC SOLVENT CEMENTS AND
PRIMERS ARE HIGHLY
LAMMABLE. PROVIDE
ADEQUATE VENTILATION AND DO
NOT ASSEMBLE NEAR HEAT
SOURCE OR AN OPEN LAME. DO
NOT SMOKE. AVOID SKIN OR EYE
CONTACT. OBSERVE ALL
CAUTIONS AND WARNINGS
PRINTED ON MATERIAL
CONTAINERS. AILURE TO
OLLOW THESE GUIDELINES
MAY RESULT IN IRE, EXPLOSION
OR ASPHYXIATION CAUSING
PERSONAL INJURY OR DEATH.
All pipe, fittings, solvent cement,
primers and procedures must
conform to American National
Standard Institute and American
Society for Testing and Materials
(ANSI/ASTM) standards as shown
below:
CEMENTING JOINTS
Properly seal all joints in the PVC
vent using the following materials and
procedures.
PVC CLEANER-PRIMER AND
PVC MEDIUM-BODY SOLVENT
CEMENT
IMPORTANT: After cutting pipe,
remove all ragged edges and burrs.
This is important to prevent reduction
in pressure drop throughout the
system.
!WARNING
PIPE & ITTING MATERIAL ASTM
SPECI ICATION
Schedule 40 PVC (Pipe) 1785
Schedule 40 PVC (Cellular Core Pipe) F891
Schedule 40 PVC (Fittings) 2466
S R-21PVC (Pipe) 2241
S R-26 PVC (Pipe) 2241
Schedule 40 ABS Cellular Core WV (Pipe) F628
Schedule 40 ABS (Pipe) 1527
Schedule 40 ABS (Fittings) 2468
ABS- WV ( rain Waste & Vent)
(Pipe & Fittings) 2661
PVC- WV ( rain Waste & Vent)
(Pipe & Fittings) 2665

17
NON-DIRECT
FURNACE INSTALLATIONS
THE URNACE AND ANY OTHER
UEL-BURNING APPLIANCE MUST
BE PROVIDED WITH ENOUGH
RESH AIR OR PROPER
COMBUSTION AND VENTILATION
O THE LUE GASES. MOST
HOMES WILL REQUIRE THAT
OUTSIDE AIR BE SUPPLIED INTO
THE URNACE AREA. AILURE
TO DO SO CAN CAUSE
PERSONAL INJURY OR DEATH
ROM CARBON MONOXIDE
POISONING.
Adequate facilities for providing air for
combustion and ventilation must be
provided in accordance with section
5.3, “Air for Combustion and
Ventilation” of the National Fuel Gas
Code, ANSI Z223.1 (latest edition) or
applicable provisions for the local
building codes, and not obstructed so
as to prevent the flow of air to the
furnace.
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
(but not limited to the following) will
require OUT OOR AIR for
combustion, due to chemical
exposures:
• Commercial 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 (but not
limited to the following) will also
require OUT OOR AIR for
combustion:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine-based swimming pool
chemicals
• Water softening chemicals
• e-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
•Cleaning solvents (such as
perchloroethylene)
• Printing inks, paint removers,
varnishes, etc.
• Hydrochloric acid
• Cements and glues
•Antistatic fabric softeners for
clothes dryers
• Masonry curing and acid washing
materials
Combustion 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. When burned in
a gas flame, vapors from these
products form acid compounds. The
acid compounds increase the dew
point temperature of the flue products
and are highly corrosive after they
condense.
ALL URNACE INSTALLATIONS
MUST COMPLY WITH THE
NATIONAL UEL GAS CODE AND
LOCAL CODES TO PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR OR THE
URNACE. AILURE TO DO SO
CAN RESULT IN EXPLOSION,
IRE, PROPERTY DAMAGE,
CARBON MONOXIDE POISONING,
PERSONAL INJURY OR DEATH.
Combustion 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.
EXAMPLE 1:
URNACE LOCATED IN AN
UNCON INED SPACE
Using indoor air for combustion.
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. F t Typical Room Siz
Input With 8' C iling With 8' C iling
45,000 2 1 14' x 20' OR 16' x 1 '
60,000 375 15' x 25' OR 19' x 20'
75,000 469 15' x 31' OR 20' x 24'
90,000 563 20’ x 2 ’ OR 24’ x 24’
105,000 657 20' x 33' OR 26' x 25'
120,000 750 25' x 30' OR 24' x 32'
If the open space containing the
furnace is in a building with tight
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.
EXAMPLE 2:
URNACE LOCATED IN A
CON INED 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 IN OOR AIR FOR
COMBUSTION
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.
COMBUSTION AND VENTILATION AIR
!WARNING
!WARNING

18
BTUH Fr Ar a
Input Each Op ning
45,000 100 square inches
60,000 100 square inches
75,000 100 square inches
90,000 100 square inches
105,000 105 square inches
120,000 120 square inches
B. USING OUT OOR AIR FOR
COMBUSTION
IMPORTANT: o not take air from
an attic space that is equipped
with power ventilation.
The confined space must
communicate with the outdoors in
accordance with Methods 1 or 2.
The minimum dimension of air
openings shall not be less than 3
inches. Where ducts are used,
they shall be of the same cross-
sectional area as the free area of
the openings to which they
connect.
Method 1
Two permanent openings, one
located within 12 inches of the top
and one located within 12 inches
of the bottom of the enclosure,
shall be provided. The openings
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 as shown in
Figure 11, each opening shall
have a minimum free area of 1
square inch for each 4,000 BTUH
of total appliance input rating in the
enclosure.
BTUH Fr Ar a Round Pip
Input Each Op ning Siz
45,000 11.25 square inches 4"
60,000 15.00 square inches 5"
75,000 1 .75 square inches 5"
90,000 22.50 square inches 6"
105,000 26.25 square inches 6"
120,000 30.00 square inches 6"
b. Where communicating with
outdoors through horizontal ducts,
each opening shall have a
minimum free area of 1 square
inch for each 2,000 BTUH of total
input rating of all equipment in the
enclosure (see Figure 12).
Here are some typical sizes:
BTUH Fr Ar a Round Pip
Input Each Op ning Siz
45,000 22.50 square inches 6"
60,000 30.00 square inches 6"
75,000 37.50 square inches 7"
90,000 45.00 square inches "
105,000 52.50 square inches "
120,000 60.00 square inches 9"
IGURE 11
AIR ROM ATTIC/CRAWL SPACE
IGURE 12
OUTSIDE AIR USING A HORIZONTAL DUCT
IGURE 10
AIR ROM HEATED SPACE
NOTE:
EACH OPENING SHALL
HAVE A REE AREA O
NOT LESS THAN ONE
SQUARE INCH PER 1,000
BTU PER H0UR O THE
TOTAL INPUT RATING O
ALL EQUIPMENT IN THE
ENCLOSURE, BUT NOT
LESS THAN 100 SQUARE
INCHES.
GAS
WATER
HEATER
URNACE
GAS
WATER
HEATER
GAS
WATER
HEATER
URNACE URNACE
12" MAX.
12"
MAX.
1 SQ. INCH PER
4000 BTUH INLET AIR
OUTLET AIR 1 SQ. INCH
PER 2000 BTUH
INLET AIR 1 SQ. INCH
PER 2000 BTUH
1 SQ. INCH PER
4000 BTUH
OUTLET AIR
OPTIONAL 1 SQ. INCH PER 4000 BTUH INLET AIR
VENTILATED
ATTIC GABLE OR
SO IT VENTS
GABLE
VENT
OUTLET AIR
IN ATTIC
MUST BE
ABOVE
INSULATION

19
IGURE 13
COMBUSTION AIR ITTING
Method 2 (not shown)
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 shall have a minimum free
area of:
a. 1 square inch for each 3,000
BTUH of the total input rating of all
equipment located in the enclosure
and
BTUH Fr Ar a Round Pip
Input Each Op ning Siz
45,000 15.00 square inches 4"
60,000 16.67 square inches 5"
75,000 25.00 square inches 6"
90,000 30.00 square inches 6"
105,000 35.00 square inches 7"
120,000 40.00 square inches 7"
b. Not less than the sum of the
areas of all vent connectors in the
confined space.
If unit is installed where there is an
exhaust fan, sufficient ventilation
must be provided to prevent the
exhaust fan from creating a negative
pressure.
Combustion air openings must not be
restricted in any manner.
CONSULT LOCAL CODES OR
SPECIAL REQUIREMENTS.
CONNECTION TO
FURNACE
IMPORTANT: When indoor
combustion air is used, the inlet air
opening at the furnace must be
protected from accidental blockage.
(See Figure 13).
UP LOW
DOWN LOW/HORIZONTAL
2" PVC
DOUBLE
ELBOW
TOP
OPTION
EXHAUST
2" PVC ELBOW
SIDE
OPTION
2" PVC
DOUBLE
ELBOW*
COMBUSTION AIR
EXHAUST
ATTACH DOUBLE ELBOW TO INTAKE AIR
COLLAR AND SECURE WITH TWO SHEET
METAL SCREWS TO PREVENT ACCIDENTAL
BLOCKAGE O INTAKE AIR OPENING.
*NOTE: WHEN URNACE IS INSTALLED IN A HORIZONTAL POSITION
ONLY ONE 90° ELBOW IS REQUIRED. INSTALL THE ELBOW SO THE
OPEN END IS POINTED DOWNWARD.
ATTACH DOUBLE ELBOW TO TOP INLET
AIR OPENING OR 90° ELBOW TO SIDE
INLET AIR OPENING TO PREVENT
ACCIDENTAL BLOCKAGE O INTAKE
OPENING. PLUG OPENING NOT USED.
I337 I336
PREDRILL OR SCREWS.

20
NON-DIRECT VENT
INSTALLATION
GUIDELINES
IMPORTANT: Failure to correctly follow
all venting guidelines may result in
erratic furnace operation, freeze-up of
combustion air or exhaust air piping or
sooting of the furnace.
All exhaust piping must be installed in
compliance with Part 7, “Venting of
Equipment,” of the latest edition of the
National Fuel Gas Code NPFA54/ ANSI
Z223.1-, local codes or ordinances and
these instructions.
1. Vertical piping is preferred.
2. All horizontal piping must slope
upward a minimum of 1/4inch per
foot of run so that condensate drains
toward the furnace.
3. All horizontal runs must be
supported at least every 4 feet. No
sags or dips are permitted.
4. IMPORTANT: o not common vent
with any other appliance. o not
install in the same chase or chimney
with a metal or high temperature
plastic pipe from another gas or fuel-
burning appliance unless the
required minimum clearances to
combustibles are maintained
between the pvc pipe and other
pipes.
5. All vent runs through unconditioned
spaces where below-freezing
temperatures are expected should
be insulated with 1-in. thick,
medium-density, foil-faced
fiberglass. An equivalent “arm-a-
flex” or “rub-a-tex” insulation may
also be used as long as there is no
heat tape applied to the vent pipe.
For horizontal runs where water may
collect, wrap the vent pipe with self-
regulating 3 or 5 watt heat tape. The
heat tape must be U.L. listed and
installed per the manufacturer’s
instructions.
6. The minimum vent pipe length is
5 feet.
7. Extend the exhaust pipe a minimum
of 18” from the cabinet before turning
vent.
8. Vent cannot be ran underground.
IGURE 14
TEE TERMINAL – OR STANDARD
HORIZONTAL NON-DIRECT
INSTALLATION
VENT
12" 12" MIN. ABOVE
GRADE OR
SNOW LEVEL
NUMBERS OF ELBOWS
45° OR 90°
Medium / Long Radius ONLY
1-2 3-4 5-6
2” Standard 60 55 50 45,000
Alternate 55 50 45
2”Standard 30 25 20
Alternate 25 20 15
60,000
3”Standard 120 120 115
Alternate 120 120 110
3”Standard 45 40 NR
75,000
Alternate NR NR NR
3” Standard 90 5 75
90,000
Alternate 60 50 45
105,000 3” Standard 45 40 NR
120,000 3” Standard 70 65 55
Alternate 40 30 25
NOTES:
1. *N.R. - NOT RECOMMEN E .
2. MAXIMUM OF 4 ELBOWS MAY BE USE . O NOT COUNT ELBOWS REQUIRE FOR
ALTERNATE TERMINATION. USE ONLY ME IUM OR LONG SWEEP ELBOWS.
3. A 45 OR 22.5 EGREE ELBOW IS CONSI ERE ONE ELBOW.
4. NO SCREENS MAY BE USE TO COVER EXHAUST.
*A = 17-1/2” CABINET WI TH B = 21) CABINET WI TH
FURNACE
INPUT
VENT PIPE INSTALLATION
PIPE
SIZE TERMINATION
TABLE 1
UP LOW UNITS
OR NON-DIRECT VENT APPLICATIONS - AIR OR COMBUSTION
PROVIDED ROM INDOORS
MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE PIPE
ELEVATED SINGLE PIPE
ALTERNATE TEE
TERMINATION
See Figure 15. The tee termination may
be elevated up to 24 inches above the
wall penetration if required for anticipated
snow levels. Use 2 long-sweep, 2-in.
PVC elbows and 2-in. PVC pipe,
attaching the tee so it is 12 inches from
the wall.
NUMBERS OF ELBOWS
45° OR 90°
Medium / Long Radius ONLY
1-2 3-4
2” Standard 50 40
Alternate 40 30
60,000
3” Standard 50 40
Alternate 50 40
3” Standard 50 40
75,000 Alternate 50 40
90,000 3” Standard 50 40
Alternate 50 40
105,000 3” Standard 50 40
Alternate 50 40
NOTES:
1. *N.A. - NOT APPLICABLE.
2. MAXIMUM OF 4 - 90 EGREE ELBOWS MAY BE USE . O NOT COUNT ELBOWS REQUIRE FOR
ALTERNATE TERMINATION. USE ONLY ME IUM OR LONG SWEEP ELBOWS.
3. A 45 OR 22.5 EGREE ELBOW IS CONSI ERE ONE ELBOW.
4. NO SCREENS MAY BE USE TO COVER EXHAUST.
*A = 17-1/2” CABINET WI TH B = 21” CABINET WI TH
FURNACE
INPUT
PIPE
SIZE TERMINATION
TABLE 2
DOWN LOW/HORIZONTAL UNITS
OR NON-DIRECT VENT APPLICATIONS - AIR OR COMBUSTION
PROVIDED ROM INDOORS
MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE PIPE