Carrier 58CTA Quick guide

58CTA/58CTX
2 Stage Deluxe Induced-Combustion
4-Way Multipoise Furnace
Form No. 58CT-5SI 1-05
Installation, Start-up, Operating, and Service
and Maintenance Instructions
-Series 110
THE PERFORMANCE 80 GAS FURNACE
The 58CTA/CTX Two-Stage, 4-way Multipoise Gas Furnaces offer unmatched comfort in their class with
ComfortHeat™Technology in an 80% AFUE gas furnace. You get the benefits of a ComfortHeat™Technology
furnace: reduced drafts, reduced sound levels, longer cycles, less temperature swings between cycles, and less
temperature differences between rooms. Its exclusive, intelligent microprocessor control adapts to the heating needs
of the home by automatically adjusting high and low heat times to maximize comfort. The 58CTA/CTX furnaces are
approved for use with natural or propane gas, and the 58CTX is also approved for use in Low NOx Air Quality
Management Districts.
STANDARD FEATURES
- ComfortHeat™Technology
Two-stage heating with single-stage thermostat
Very low operating sound through low-stage operation and
QuieTech™system
- Media Filter Cabinet Available
- Microprocessor based "smart" control center
Adapts heating stages to meet demand
Dehumidification selection for summer-time cooling
Adjustable heating air temperature rise
Adjustable cooling airflow
ComfortFan™--Constant fan speed selectable from
thermostat
LED diagnostics and self test feature
Stores fault codes during power outages
- 4-way Multipoise furnace, 13 vent applications
- Hot surface ignition (HSI)
- Draft safeguard switch to ensure proper furnace venting
- All Models Chimney-Friendly when used with the
accessory vent kit.
- Insulated blower compartment
- Heat pump compatible
- Residential installations eligible for consumer financing
through the Retail Credit Program
- Twinning in Upflow, Downflow and Horizontal
CERTIFIED
®
LIMITED WARRANTY
- 20-year warranty on "Super S™" heat exchanger
- 5-year parts warranty on all other components
Catalog No: 535-80124

Important Information
Addendum to the Installation, Start-up, and Operating and
Maintenance Instructions
Series 110 or Series B 33 1/3” Mid-Efficiency Furnaces
This furnace is equipped with the White-Rodgers Series G valve. This instruction
sheet is to familiarize you with Series G gas valve and to be used to check and
adjust gas pressure for proper installation and start-up.
This sheet will be used to complete the “Adjustments” section of the “Start-up Procedures”
section of the Installation, Start-up, Operating and Maintenance Instructions.
See Fig. 1 for two-stage gas valve. This version of the G valve has standard 1/8” NPT inlet and
outlet pressure taps that are removed with a 3/16” hex head wrench for connection to a
manometers and Low Gas Pressure Switch (when used). For conversions to propane gas, refer to
the instructions in the Natural to Propane Conversion Kit, KGANP3001ALL.
Fi
g
. 1-Two-Sta
g
e Gas Valve
The major difference in the two-stage G valve, besides the compact design, is the location of the
Low and High stage regulators. Both regulators are located on top of the valve and are marked
“Lo” and “Hi” next to the regulator seal caps. Both regulator springs are adjusted with a standard
3/16” or smaller flat-tipped screwdriver.
The other difference is the G series valve IS NOT a dual-fuel gas valve. Conversions to propane
will require the replacement of BOTH regulator adjustment springs. The Low stage and High
stage springs are identical to each other and the 2 springs are included in the Natural to Propane
Conversion Kit, KGANP3001ALL
IMPORTANT:
This sheet MUST be inserted into the Installation, Start-up, Operating and Maintenance
Instructions and left with the furnace.
58CTV-1SI/II 312AJ-45-1

2-Stage Deluxe
Induced-Combustion
4-Way Multipoise Furnace
Installation, Start-up, Operating, and
Service and Maintenance Instructions
Series 110/B
NOTE: Read the entire instruction manual before starting the
installation.
This symbol →indicates a change since the last issue.
→Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1-2002©,
with permission of National Fire Protection Association, Quincy, MA 02269 and
American Gas Association, Washington DC 20001. This reprinted material is not the
complete and official position of the NFPA or ANSI on the referenced subject, which
is represented only by the standard in its entirety.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................2
INTRODUCTION..........................................................................3
CODES AND STANDARDS........................................................5
Safety.........................................................................................5
General Installation...................................................................5
Combustion and Ventilation Air..............................................5
Duct Systems ............................................................................5
Acoustical Lining and Fibrous Glass Duct..............................5
Gas Piping and Gas Pipe Pressure Testing..............................5
Electrical Connections..............................................................5
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE ................................................................................5
LOCATION....................................................................................5
General......................................................................................5
Location Relative to Cooling Equipment ................................7
AIR FOR COMBUSTION AND VENTILATION......................7
INSTALLATION.........................................................................10
Upflow Installation .................................................................10
Bottom Return Air Inlet....................................................10
Side Return Air Inlet.........................................................10
Leveling Legs (If Desired)................................................10
Downflow Installation ............................................................11
Bottom Return Air Inlet....................................................11
Horizontal Installation ............................................................11
Suspended Unit Support....................................................11
Platform Unit Support.......................................................11
Roll-Out Protection............................................................11
Bottom Return Air Inlet....................................................11
Side Return Air Inlet.........................................................11
Filter Arrangement..................................................................15
Air Ducts.................................................................................15
General Requirements .......................................................15
Ductwork Acoustical Treatment .......................................15
Supply Air Connections....................................................15
Return Air Connections.....................................................17
Gas Piping...............................................................................17
Electrical Connections............................................................19
115-V Wiring.....................................................................20
J-Box Relocation ...............................................................20
Electrical Connection to J-Box.........................................21
Power Cord Installation in Furnace J-Box.......................22
BX Cable Installation in Furnace J-Box ..........................22
24-V Wiring.......................................................................22
Accessories ........................................................................22
Venting....................................................................................22
General Venting Requirements.........................................27
Masonry Chimney Requirements......................................27
Appliance Application Requirements ...............................28
Additional Venting Requirements.....................................31
Sidewall Venting ...............................................................33
START-UP, ADJUSTMENT, AND SAFETY CHECK............33
General....................................................................................33
Start-Up Procedures ...............................................................33
Adjustments.............................................................................34
Check Safety Controls............................................................38
Checklist..................................................................................38
SERVICE AND MAINTENANCE PROCEDURES..................41
Introduction.............................................................................41
General...............................................................................41
Electrical Controls and Wiring .........................................41
Care and Maintenance............................................................44
Cleaning and/or Replacing Air Filter ...............................46
Blower Motor and Wheel..................................................46
Cleaning Heat Exchanger..................................................47
Sequence of Operation............................................................49
Wiring Diagrams.....................................................................52
Troubleshooting ......................................................................52
Cancels: II 312A-45-3 II 312A-45-4
1-05
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 6a 8a PC 101 Catalog No. See Cover Printed in U.S.A. Form 58CT-5SI Pg 1 1-05 Replaces: 58CT-4SI

SAFETY CONSIDERATIONS
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, serious injury, death, or property damage.
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause carbon monoxide poisoning, explo-
sion, fire, electrical shock, or other conditions which may
cause personal injury or property damage. Consult a qualified
service agency, local gas supplier, or your distributor or
branch for information or assistance. The qualified service
agency must use only factory-authorized and listed kits or
accessories when modifying this product.
FURNACE RELIABILITY HAZARD
Improper installation or misapplication of furnace can require
excessive servicing or cause premature component failure.
Application of this furnace should be indoors with special
attention given to vent sizing and material, gas input rate, air
temperature rise, unit leveling, and unit sizing.
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified
personnel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in literature, on tags, and
on labels attached to or shipped with furnace and other safety
precautions that may apply.
These instructions cover minimum requirements and conform to
existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residen-
tial construction practices. We require these instructions as a
minimum for a safe installation.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
Wear safety glasses and work gloves. Have fire extinguisher
available during start-up and adjustment procedures and service
calls.
This is the safety-alert symbol . When you see this symbol on
the furnace and in instructions or manuals, be alert to the potential
for personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies a hazard which
could result in personal injury or death. CAUTION is used to
identify hazards which may result in minor personal injury or
product and property damage. NOTE is used to highlight sugges-
tions which will result in enhanced installation, reliability, or
operation.
1. Use only with type of gas approved for this furnace. Refer to
the furnace rating plate.
2. Install this furnace only in a location and position as specified
in the “Location” section of these instructions.
NOTES:
1. Two additional 7/8-in. diameter holes are located in the top plate.
2. Minimum return-air openings at furnace, based on metal duct. If flex duct is used, see flex duct manufacturer’s recommendations for equivalent diameters.
a. For 800 CFM-16-in. round or 14 1/2 x 12-in. rectangle.
b. For 1200 CFM-20-in. round or 14 1/2 x 19 1/2-in. rectangle.
c. For 1600 CFM-22-in. round or 14 1/2 x 22-in. rectangle.
d. For airflow requirements above 1800 CFM, see Air Delivery table in Product Data literature for specific
use of single side inlets. The use of both side inlets, a combination of 1 side and the bottom, or the
bottom only will ensure adequate return air openings for airflow requirements above 1800 CFM.
→Fig. 1—Dimensional Drawing
A04037
2-7/16"
1-1/8"
28-7/8"
25-1/4"
22-9/16"
JUNCTION BOX
LOCATION
7/8" DIA
ACCESSORY 1/2" DIA THERMOSTAT
WIRE ENTRY
3-15/16"
LEFT HAND GAS
ENTRY
33-5/16" 24-7/8"
5-1/2"
7/8" DIA. ACCESSORY
11/16"
21-5/8"
BOTTOM INLET 1-11/16"
13/16"
11/16"
4-13/16"
AIRFLOW
19"
OUTLET
13/16"
11/16"
8-9/16"
VENT OUTLET
5 PLACES (TYP)
3-3/4"
1-3/4" DIA.RIGHT HAND
GAS ENTRY
7/8" DIA. K.O. WIRE ENTRY
SIDE INLET
14-7/8"
7/8" DIA. ACCESSORY
1-1/4"
1"
22-1/16"
A
D
F
E
(FLUE COLLAR)
5-15/16"
24"
CASING
1-5/16"
1/2" DIA. K.O.THERMOSTAT
WIRE ENTRY
ALTERNATE
JUNCTION BOX
LOCATIONS (TYP)
26-1/8"
1-1/2"
7-3/4" 9-5/8"
11-1/2"
5-1/2"
2

3. Provide adequate combustion and ventilation air to the furnace
space as specified in “Air for Combustion and Ventilation”
section.
4. Combustion products must be discharged outdoors. Connect
this furnace to an approved vent system only, as specified in
the “Venting” section of these instructions.
5. Never test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the detec-
tion of leaks to check all connections, as specified in the “Gas
Piping” section.
6. 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 speci-
fied in the “Start-Up, Adjustments, and Safety Check” section.
See furnace rating plate.
7. 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. See “Air Ducts” section.
8. A gas-fired furnace for installation in a residential garage must
be installed as specified in the warning box in the “Location”
section.
9. The furnace is not to be used for temporary heating of
buildings or structures under construction. See page 7 for
caution box.
10. These Multipoise Gas-Fired Furnaces are CSA (formerly
A.G.A. and C.G.A.) design-certified for use with natural and
propane gases (see furnace rating plate) and for installation in
alcoves, attics, basements, closets, utility rooms, crawlspaces,
and garages. The furnace is factory-shipped for use with
natural gas. A CSA (A.G.A. and C.G.A.) listed gas conversion
kit is required to convert furnace for use with propane gas.
11. See Fig. 2 for required clearances to combustible construction.
12. Maintain a 1-in. clearance from combustible materials to
supply air ductwork for a distance of 36 inches horizontally
from the furnace. See NFPA 90B or local code for further
requirements.
13. These furnaces SHALL NOT be installed directly on carpet-
ing, tile, or any other combustible material other than wood
flooring. In downflow installations, factory accessory floor
base MUST be used when installed on combustible materials
and wood flooring. Special base is not required when this
furnace is installed on manufacturer’s Coil Assembly Part No.
CD5 or CK5, or when Coil Box Part No. KCAKC is used. See
Fig. 2 for clearance to combustible construction information.
INTRODUCTION
The Series 110/B 4–way multipoise Category I fan-assisted
furnace is CSA (formerly A.G.A. and C.G.A.) design-certified. A
Category I fan-assisted furnace is an appliance equipped with an
integral mechanical means to either draw or force products of
combustion through the combustion chamber and/or heat ex-
changer. The furnace is factory-shipped for use with natural gas.
This furnace is not approved for installation in mobile homes,
recreational vehicles, or outdoors.
These furnaces shall not be installed directly on carpeting, tile, or
any other combustible material other than wood flooring. For
downflow installations, a factory accessory floor base must be
used when installed on combustible materials and wood flooring.
This special base is not required when this furnace is installed on
the manufacturer’s coil assembly, or when the manufacturer’s coil
box is used. See Fig. 2 for clearance to combustible material
information.
This furnace is designed for minimum continuous return-air
temperature of 60°F db or intermittent operation down to 55°F db
such as when used with a night setback thermostat. Return-air
temperature must not exceed 85°F db. Failure to follow these
return-air temperature limits may affect reliability of heat exchang-
ers, motors, and controls. (See Fig. 3.)
For accessory installation details, refer to the applicable instruction
literature.
NOTE: Remove all shipping brackets and materials before oper-
ating the furnace.
→Table 1—Dimensions (IN.)
FURNACE SIZE
A
CABINET
WIDTH
(IN.)
D
SUPPLY-AIR
WIDTH
(IN.)
E
RETURN-AIR
WIDTH
(IN.)
F
C.L. TOP AND
BOTTOM
FLUE COLLAR
(IN.)
FLUE
COLLAR*
(IN.) SHIP WT. (LB)
FILTER
MEDIA
CABINET
SIZE
(IN.)
045-08/024045 14-3/16 12-9/16 12-11/16 9-5/16 4 116 16
045-12/036045 14-3/16 12-9/16 12-11/16 9-5/16 4 119 16
070-08/024070 14-3/16 12-9/16 12-11/16 9-5/16 4 120 16
070-12/036070 14-3/16 12-9/16 12-11/16 9-5/16 4 124 16
070-16/048070 17-1/2 15-7/8 16 11-9/16 4 138 16
090-14/042090 17-1/2 15-7/8 16 11-9/16 4 136 16
090-16/048090 21 19-3/8 19-1/2 13-5/16 4 151 20
090-20/060090 21 19-3/8 19-1/2 13-5/16 4 156 20
110-12/036110 17-1/2 15-7/8 16 11-9/16 4 144 16
110-16/048110 21 19-3/8 19-1/2 13-5/16 4 158 20
110-22/066110 21 19-3/8 19-1/2 13-5/16 4 163 20
135-16/048135 21 19-3/8 19-1/2 13-5/16 4† 163 20
135-22/066135 24-1/2 22-7/8 23 15-1/16 4† 174 24
155-20/060155 24-1/2 22-7/8 23 15-1/16 4† 181 24
* 5” or 6” vent connector may be required in some cases.
† 135 and 155 size furnaces require five-inch or larger vents. Use a 4-5 or 4-6 inch vent adapter between furnace and vent connector.
3
→

→Fig. 2—Clearances to Combustibles
A04123
MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION
DISTANCE MINIMALE EN POUCES AUX CONSTRUCTIONS COMBUSTIBLES
INSTALLATION
327590-101 REV. C
Ø
*
Clearance arrows
do not change with
furnace orientation.
BOTTOM
DESSOUS
0"
3"
0"
0"
1"
0"
24"
MIN
SIDE
CÔTÉ
FRONT
AVANT
BCK
ARRIÈ
A
E
R
SERVIE
C
ENTRT
E
N
E
I
V
AN
AT
FRONT
SIE
CÔTÈ
FOU
U
FRNAC
S
E
E
I
A
RN
Ø
TOP / PLENUM
DESSUS / CHAMBRED'AIR
D
*
*
†
MIN
Ø
*
†
This forced air furnace is equipped for use with
natural gas at altitudes 0-10,000 ft (0-3,050m).
An accessory kit, supplied by the
manufacturer, shall be used to convert to propane
gas use or may be required for some natural gas
applications.
This furnace is for indoor installation in a
building constructed on site.
This furnace may be installed on combustible
flooring in alcove or closet at minimum clearance
as indicated by the diagram from combusitble
material.
This furnace may be used with a Type B-1 Vent
and may be vented in common with other gas
fired appliances.
Cette fournaise à air pulsé est équipée
pour utilisation avec gaz naturel et altitudes
comprises entre 0-3,050m (0-10,000 pi).
Utiliser une trousse de conversion, fournie par
le fabricant, pour passer au gaz propane ou pour
certaines installations au gaz naturel.
Cette fournaise est prévue pour être
installée dans un bâtiment construit sur place.
Cette fournaise peut être installée sur
un plancher combustible dans une alcôve ou
dans un garde-robe en respectant le minimum
d'espace libre des matériaux combustibles, tel
qu
´ indiqué sur le diagramme.
Cette fournaise peut être utilisée avec un
conduit d
´ évacuation de Type B-1 ou connectée
au conduit ommun d 'autres appareils à gaz.
MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION
Installation on non-combusibible floors only.
For Installation on combustible flooring only when installed on special base, Part No. KGASB0201ALL,
Coil Assembly, Part No. CD5 or CK5, or Coil Casing, Part No. KCAKC.
18 inches front clearance required for alcove.
Indicates supply or return sides when furnace is in the horizontal position. Line contact only permissible
between lines formed by intersections of the Top and two Sides of the furnace jacket, and building joists,
studs or framing.
DOWNFLOW POSITIONS:
DÉGAGEMENT MINIMUM EN POUCES AVEC ÉLÉMENTS
DE CONSTRUCTION COMBUSTIBLES
Pour l ´ installation sur plancher non combustible seulement.
Pour l ´ installation sur un plancher combustible seulement quand on utilise la base spéciale, pièce
nº KGASB0201ALL, l
´ ensemble serpentin, pièce nº CD5 ou CK5, ou le carter de serpentin, pièce
nº KCAKC.
Dans une alcôve, on doit maintenir un dégagement à l ´ avant de 18 po (450mm).
La poistion indiquée concerne le côté d
´ entrée ou de retour quand la fournaise est dans la
position horizontale.
Le contact n
´ est permis qu ´ entre les lignes formées par les intersections du dessus et des
deux côtés de la cherrise de la fournaise et les solives, montant sous cadre de charpente.
POUR LA POSITION COURANT DESCENDANT:
Cette fournaise est approuvée pour l 'installation HORIZONTALE
et la circulation d 'air VERS LE HAUT et VERS LE BAS.
This furnace is approved for UPFLOW, DOWNFLOW, and
HORIZONTAL installations.
Clearance in inches
Dégagement (po).
Les fléches de dégagement
ne change pas avec
l 'orientation de la fournaise.
Vent Clearance to combustibles:
For Single Wall vents 6 inches (6 po).
For Type B-1 vent type 1 inch (1 po).
Dégagement de l ´ évent avec combustibles:
Pour conduit d ´ évacuation à paroi simple 6 po (6 inches).
Pour conduit d
´ évacuation de Type B-1 1 po (1 inch).
†
4

CODES AND STANDARDS
Follow all national and local codes and standards in addition to
these instructions. The installation must comply with regulations
of the serving gas supplier, local building, heating, plumbing, and
other codes. In absence of local codes, the installation must
comply with the national codes listed below and all authorities
having jurisdiction.
In the United States and Canada, follow all codes and standards for
the following:
Step 1—Safety
• US: National Fuel Gas Code (NFGC) NFPA 54–2002/ANSI
Z223.1–2002 and the Installation Standards, Warm Air Heating
and Air Conditioning Systems ANSI/NFPA 90B
• CANADA: CSA B149.1-00 National Standard of Canada
Natural Gas and Propane Installation Code (NSCNGPIC)
Step 2—General Installation
• US: Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; (www.NFPA.org) or
for only the NFGC, contact the American Gas Association, 400
N. Capitol Street, N.W., Washington DC 20001
(www.AGA.org.)
• CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke (Tor-
onto), Ontario, M9W 1R3 Canada
Step 3—Combustion and Ventilation Air
• US: Section 8.3 of the NFGC, Air for Combustion and
Ventilation
• CANADA: Part 7 of NSCNGPIC, Venting Systems and Air
Supply for Appliances
Step 4—Duct Systems
• US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning Con-
tractors National Association (SMACNA), or American Soci-
ety of Heating, Refrigeration, and Air Conditioning Engineers
(ASHRAE) 2001 Fundamentals Handbook Chapter 34 or 2000
HVAC Systems and Equipment Handbook Chapters 9 and 16.
Step 5—Acoustical Lining and Fibrous Glass Duct
• US and CANADA: current edition of SMACNA and NFPA
90B as tested by UL Standard 181 for Class I Rigid Air Ducts
Step 6—Gas Piping and Gas Pipe Pressure Testing
• US: NFGC; chapters 5, 6, 7, and 12 and National Plumbing
Codes
• CANADA: NSCNGPIC Parts 3, 4, and 5, and Appendices A,
B, E and H.
Step 7—Electrical Connections
• US: National Electrical Code (NEC) ANSI/NFPA 70–2002
• CANADA: Canadian Electrical Code CSA C22.1
Step 8—Venting
• US: NFGC; chapters 10 and 13
• CANADA: NSCNGPIC Part 7 and Appendix C
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE
FURNACE RELIABILITY HAZARD
Improper installation or service of furnace may cause prema-
ture furnace component failure.
Electrostatic discharge can affect electronic components.
Follow the Electrostatic Discharge Precautions Procedure
listed below during furnace installation and servicing to
protect the furnace electronic control. Precautions will pre-
vent electrostatic discharges from personnel and hand tools
which are held during the procedure. These precautions will
help to avoid exposing the control to electrostatic discharge
by putting the furnace, the control, and the person at the same
electrostatic potential.
1. Disconnect all power to the furnace. Multiple disconnects may
be required. DO NOT TOUCH THE CONTROL OR ANY
WIRE CONNECTED TO THE CONTROL PRIOR TO DIS-
CHARGING YOUR BODY’S ELECTROSTATIC CHARGE
TO GROUND.
2. Firmly touch the clean, unpainted, metal surface of the furnace
chassis which is close to the control. Tools held in a person’s
hand during grounding will be satisfactorily discharged.
3. After touching the chassis, you may proceed to service the
control or connecting wires as long as you do nothing to
recharge your body with static electricity (for example; DO
NOT move or shuffle your feet, do not touch ungrounded
objects, etc.).
4. If you touch ungrounded objects (and recharge your body with
static electricity), firmly touch a clean, unpainted metal
surface of the furnace again before touching control or wires.
5. Use this procedure for installed and uninstalled (ungrounded)
furnaces.
6. Before removing a new control from its container, discharge
your body’s electrostatic charge to ground to protect the
control from damage. If the control is to be installed in a
furnace, follow items 1 through 4 before bringing the control
or yourself in contact with the furnace. Put all used and new
controls into containers before touching ungrounded objects.
7. An ESD service kit (available from commercial sources) may
also be used to prevent ESD damage.
LOCATION
GENERAL
This multipoise furnace is shipped in packaged configuration.
Some assembly and modifications are required when used in any
of the four applications shown in Fig. 4.
Fig. 3—Return Air Temperature
A02055
60
5
→
→
→

NOTE: For high-altitude installations, the high-altitude conver-
sion kit MUST be installed at or above 5500 ft above sea level.
Obtain high-altitude conversion kit from your area authorized
distributor.
This furnace must:
• be installed so the electrical components are protected from
water.
•not be installed directly on any combustible material other than
wood flooring (refer to SAFETY CONSIDERATIONS).
• be located close to the chimney or vent and attached to an air
distribution system. Refer to Air Ducts section.
• be provided ample space for servicing and cleaning. Always
comply with minimum fire protection clearances shown on the
furnace clearance to combustible construction label.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death, and furnace damage.
Corrosive or contaminated air may cause failure of parts
containing flue gas, which could leak into the living space.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products. Do not install
furnace in a corrosive or contaminated atmosphere. Make
sure all combustion and circulating air requirements are met,
in addition to all local codes and ordinances.
The following types of furnace installations may require OUT-
DOOR AIR for combustion due to chemical exposures:
• Commercial buildings
• Buildings with indoor pools
• Laundry rooms
• Hobby or craft rooms, and
• Chemical storage areas
If air is exposed to the following substances, it should not be used
for combustion air, and outdoor air may be required for combus-
tion:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• Water softening chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as perchloroethylene)
• Printing inks, paint removers, varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes dryers
• Masonry acid washing materials
All fuel-burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative
pressure in the equipment room or space. A positive seal must be
made between the furnace cabinet and the return-air duct to
prevent pulling air from the burner area and from draft safeguard
opening.
Fig. 4—Multipoise Orientations
A02097
THE BLOWER IS LOCATED
TO THE RIGHT OF THE
BURNER SECTION, AND
AIR CONDITIONED AIR IS
DISCHARGED TO THE LEFT.
THE BLOWER IS
LOCATED BELOW THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED UPWARD.
THE BLOWER IS
LOCATED ABOVE THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED DOWNWARD
THE BLOWER IS
LOCATED TO THE LEFT
OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGEDTOTHE RIGHT.
Fig. 5—Installation in a Garage
A93044
18-IN. MINIMUM
TO BURNERS
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FIRE, INJURY OR DEATH HAZARD
Improper location or inadequate protection could result in fire
or explosion.
When the furnace is installed in a residential garage, the
burners and ignition sources must be located at least 18 inches
above the floor. The furnace must be located or protected to
avoid damage by vehicles. When the furnace is installed in a
public garage, airplane hangar, or other building having a
hazardous atmosphere, the furnace must be installed in
accordance with the NFGC or NSCNGPIC. (See Fig. 5.)
PERSONAL INJURY AND/OR PROPERTY DAMAGE
HAZARD
Improper use or installation of this furnace can cause prema-
ture component failure.
This gas furnace may be used for construction heat provided
that:
-The furnace is permanently installed with all electrical
wiring, piping, venting and ducting installed according to
these installation instructions. A return air duct is provided,
sealed to the furnace casing, and terminated outside the space
containing the furnace. This prevents a negative pressure
condition as created by the circulating air blower, causing a
flame rollout and/or drawing combustion products into the
structure.
-The furnace is controlled by a thermostat. It may not be ″hot
wired″to provide heat continuously to the structure without
thermostatic control.
-Clean outside air is provided for combustion. This is to
minimize the corrosive effects of adhesives, sealers and other
construction materials. It also prevents the entrainment of
drywall dust into combustion air, which can cause fouling
and plugging of furnace components.
-The temperature of the return air to the furnace is no less
than 55 degrees F, with no evening setback or shutdown. The
use of the furnace while the structure is under construction is
deemed to be intermittent operation per our installation
instructions.
-The air temperature rise is within the rated rise range on the
furnace rating plate, and the gas input rate has been set to the
nameplate value.
-The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.
-The furnace, ductwork and filters are cleaned as necessary
to remove drywall dust and construction debris from all
HVAC system components after construction is completed.
-Verify proper furnace operating conditions including igni-
tion, gas input rate, air temperature rise, and venting accord-
ing to these installation instructions.
FIRE, INJURY, OR DEATH HAZARD
Failure to follow this warning could result in unsafe furnace
operation.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control opera-
tion will be adversely affected. Never connect return-air ducts
to the back of the furnace. (See Fig. 6.)
LOCATION RELATIVE TO COOLING EQUIPMENT
The cooling coil must be installed parallel with, or on the
downstream side of the unit to avoid condensation in the heat
exchangers. When installed parallel with the furnace, dampers or
other flow control must prevent chilled air from entering the
furnace. If the dampers are manually operated, they must be
equipped with means to prevent operation of either unit unless the
damper is in the full-heat or full-cool position.
AIR FOR COMBUSTION AND VENTILATION
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
U.S. installations: Section 8.3 of the NFGC, Air for Combustion
and Ventilation, and applicable provisions of the local building
codes.
Canadian installations: Part 7 of the NSCNGPIC, Venting
Systems and Air Supply for Appliances and all authorities having
jurisdiction.
FURNACE CORROSION HAZARD
Failure to follow this caution may result in furnace damage.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.
Fig. 6—Prohibit Installation on Back
A02054
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CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
The operation of exhaust fans, kitchen ventilation fans,
clothes dryers, attic exhaust fans or fireplaces could create a
NEGATIVE PRESSURE CONDITION at the furnace.
Make-up air MUST be provided for the ventilation devices, in
addition to that required by the furnace. Refer to Carbon
Monoxide Poisoning Hazard warning in venting section of
these instructions to determine if an adequate amount of
make-up air is available.
The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume
of at least 50 cubic feet per 1,000 Btuh input rating for all gas
appliances installed in the space.
• Spaces having less than 50 cubic feet per 1,000 Btuh require
the OUTDOOR COMBUSTION AIR METHOD.
• Spaces having at least 50 cubic feet per 1,000 Btuh may use the
INDOOR COMBUSTION AIR, STANDARD or KNOWN-
AIR INFILTRATION METHOD.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion,
ventilation, and dilution of flue gases using permanent hori-
zontal or vertical duct(s) or opening(s) directly communicat-
ing with the outdoors or spaces that freely communicate with
the outdoors.
2. Fig. 7 illustrates how to provide TWO OUTDOOR OPEN-
INGS, one inlet and one outlet combustion and ventilation air
opening, to the outdoors.
a. One opening MUST commence within 12″(300 mm) of
the ceiling and the second opening MUST commence
within 12″(300 mm) of the floor.
b. Size openings and ducts per Fig. 7 and Table 2.
c. TWO HORIZONTAL DUCTS require 1 square inch of
free area per 2,000 Btuh (1,100 mm
2
/kW) of combined
input for all gas appliances in the space per Fig. 7 and Table
2.
d. TWO OPENINGS OR VERTICAL DUCTS require 1
square inch of free area per 4,000 Btuh (550 mm
2
/kW) for
combined input of all gas appliances in the space per Fig.
7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 square inch of free area per 3,000 Btuh (734 mm
2
/kW)
for combined input of all gas appliances in the space per
Table 2 and
b. Not less than the sum of the areas of all vent connectors in
the space.
Table 2–Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors
FURNACE
INPUT
(BTUH)
TWO HORIZONTAL DUCTS
(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW) SINGLE DUCT OR OPENING (1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW) TWO OPENINGS OR VERTICAL DUCTS (1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)
Free Area of
Opening and Duct
(Sq. In.) Round Duct
(in. Dia) Free Area of
Opening and Duct
(sq In.) Round Duct
(in. Dia) Free Area of
Opening and Duct
(Sq In.) Round Duct
(In. Dia)
44,000 22 6 14.7 5 11 4
66,000 33 7 22 6 16.5 5
88,000 44 8 29.3 7 22 6
110,000 55 9 36.7 7 27.5 6
132,000 66 10 44 8 33 7
154,000 77 10 51.3 9 38.5 8
EXAMPLES: Determining Free Area
FURNACE WATER HEATER TOTAL INPUT
110,000 + 30,000 = (140,000 divided by 4,000) = 35.0 Sq. In. for each two Vertical Ducts or Openings
66,000 + 40,000 = (106,000 divided by 3,000) = 35.3 Sq. In. for a Single Duct or Opening
88,000 + 30,000 = (118,000 divided by 2,000) = 59.0 Sq. In. for each of two Horizontal Ducts
→Table 3–Minimum Space Volumes for 100% Combustion, Ventilation, and
Dilution from Indoors
ACH
OTHER THAN FAN-ASSISTED TOTAL
(1,000’S BTUH GAS INPUT RATE) FAN-ASSISTED TOTAL (1,000’S BTUH GAS INPUT RATE)
30 40 50 44 66 88 110 132 154
Space Volume (ft
3
)
0.60 1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300 3,850
0.50 1,260 1,680 2,100 1,320 1,980 2,640 3,300 3,960 4,620
0.40 1,575 2,100 2,625 1,650 2,475 3,300 4,125 4,950 5,775
0.30 2,100 2,800 3,500 2,200 3,300 4,400 5,500 6,600 7,700
0.20 3,150 4,200 5,250 3,300 4,950 6,600 8,250 9,900 11,550
0.10 6,300 8,400 10,500 6,600 9,900 13,200 16,500 19,800 23,100
0.00 NP NP NP NP NP NP NP NP NP
NP = Not Permitted
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