Carrier GAS FURNACE 58MXA Instructions and recipes

58MXA
Deluxe 4–Way Multipoise Fixed-Capacity
Direct Vent Condensing Gas Furnace
Installation, Start-Up, and Operating Instructions
Sizes 040-140, Series 160
NOTE: Read the entire instruction manual before starting the
installation.
This symbol →indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................2
INTRODUCTION..........................................................................3
CODES AND STANDARDS........................................................3
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........3
APPLICATIONS............................................................................5
General......................................................................................5
Upflow Applications.................................................................5
Condensate Trap Location (Factory-Shipped
Orientation)..........................................................................5
Condensate Trap Tubing (Factory-Shipped
Orientation)..........................................................................6
Condensate Trap Location (Alternate Upflow
Orientation)..........................................................................6
Condensate Trap Tubing (Alternate Upflow
Orientation)..........................................................................7
Condensate Trap Field Drain Attachment..........................7
Pressure Switch Tubing.......................................................7
Upper Collector Box and Inducer Housing
(Unused) Drain Connections...............................................7
Condensate Trap Freeze Protection....................................8
Downflow Applications............................................................8
Condensate Trap Location ..................................................8
Condensate Trap Tubing.....................................................8
Condensate Trap Field Drain Attachment..........................9
Pressure Switch Tubing.......................................................9
Condensate Trap Freeze Protection....................................9
Horizontal Left (Supply-Air Discharge)
Applications ..............................................................................9
Condensate Trap Location ..................................................9
Condensate Trap Tubing.....................................................9
Condensate Trap Field Drain Attachments ......................10
Pressure Switch Tubing.....................................................10
Condensate Trap Freeze Protection..................................10
Construct a Working Platform..........................................10
Horizontal Right (Supply-Air Discharge)
Applications ............................................................................10
Condensate Trap Location ................................................11
Condensate Trap Tubing...................................................11
Condensate Trap Field Drain Attachment........................11
Pressure Switch Tubing.....................................................11
Condensate Trap Freeze Protection..................................12
Construct a Working Platform..........................................12
LOCATION..................................................................................12
General....................................................................................12
Furnace Location Relative to Cooling
Equipment ...............................................................................13
Hazardous Locations...............................................................13
INSTALLATION.........................................................................13
Leveling Legs (If Desired).....................................................13
Installation in Upflow and Downflow
Applications ............................................................................14
Installation in Horizontal Applications..................................15
Air Ducts.................................................................................16
General Requirements .......................................................16
Ductwork Acoustical Treatment .......................................16
Supply Air Connections....................................................16
Return Air Connections.....................................................17
Filter Arrangement..................................................................17
Bottom Closure Panel.............................................................17
Gas Piping...............................................................................18
Electrical Connections............................................................19
115–v Wiring.....................................................................19
24–v Wiring.......................................................................19
Accessories ........................................................................20
Direct Venting.........................................................................20
Removal of Existing Furnaces from Common
Vent Systems.....................................................................20
Combustion-Air and Vent Piping .....................................21
Concentric Vent and Combustion-Air
Termination Kit Installation..............................................26
Multiventing and Vent Terminations................................31
Condensate Drain....................................................................31
General...............................................................................31
Application.........................................................................31
Condensation Drain Protection .........................................31
Sequence of Operation............................................................33
Heating Mode....................................................................33
Cooling Mode....................................................................34
Thermidistat Mode ............................................................34
Continuous Blower Mode .................................................37
Heat Pump Mode...............................................................37
Component Test.................................................................38
START-UP PROCEDURES........................................................38
General....................................................................................38
Prime Condensate Trap With Water......................................38
A93040
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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. 535–80085 Printed in U.S.A. Form 58MXA-13SI Pg 1 7-02 Replaces: 58MXA-12SI

Purge Gas Lines......................................................................39
Adjustments.............................................................................39
Set Gas Input Rate ............................................................39
Set Temperature Rise........................................................45
Adjust Blower Off Delay (Heat Mode)............................45
Set Thermostat Heat Anticipator ......................................45
Check Safety Controls............................................................46
Check Primary Limit Control ...........................................46
Check Pressure Switch......................................................46
Checklist..................................................................................46
SAFETY CONSIDERATIONS
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. Improper
installation or misapplication of furnace can require excessive
servicing or cause premature component failure.
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause carbon monoxide poisoning, explo-
sion, tire, electrical shock, or other conditions which may
cause personal injury or property damage. Consult a qualified
installer, service agency, local gas supplier, or your distribu-
tor or branch for information or assistance. The qualified
installer or agency must use only factory-authorized and
listed kits or accessories when modifying this product. Failure
to follow this warning could result in electrical shock, fire,
personal injury, or death.
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 unit and other safety
precautions that may apply.
These instructions cover the 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.
Wear safety glasses and work gloves. Have a fire extinguisher
available during start-up and adjustment procedures and service
calls.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when han-
dling parts. Failure to follow this caution could result in
personal injury. Have a fire extinguisher available during
start-up and adjustment procedures and service calls.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words DANGER, WARNING, CAU-
TION, and NOTE. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signifies
hazards which could result in personal injury or death. CAUTION
is used to identify unsafe practices which would result in minor
personal injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
The 58MXA Multipoise Condensing Gas-Fired Furnaces are
C.S.A. design-certified for 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 C.S.A. listed gas
conversion kit is required to convert furnace for use with propane
gas.
See Fig. 3 for required clearances to combustibles.
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.
These furnaces SHALL NOT be installed directly on carpeting,
tile, or any other combustible material other than wood flooring. In
REGISTERED QUALITY SYSTEM
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9
0
0
1
#
A
2
8
8
3
®
EFFICIENCY
RATING
CERTIFIED
CERTIFIED
Fig. 1—Multipoise Orientations
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
2
→

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. is used.
The 58MXA 040 through 120 size units are C.S.A. (A.G.A. and
C.G.A.) design-certified for use in manufactured (mobile) homes
when factory accessory conversion kit is used. The 140 size unit is
NOT design-certified for use in manufactured (mobile) homes.
These furnaces are suitable for installation in a structure built on
site or a manufactured building completed at final site. The design
of this furnace line is NOT C.S.A. design-certified for installation
in recreation vehicles or outdoors.
This furnace is designed for continuous return-air minimum
temperature of 60 °F db or intermittent operation down to 55°F db.
Return-air temperature must not exceed 85°F db. See Fig. 4.
These furnaces are shipped with the drain and pressure tubes
connected for UPFLOW applications. Minor modifications are
required when used in DOWNFLOW, HORIZONTAL RIGHT, or
HORIZONTAL LEFT (supply-air discharge direction) applica-
tions as shown in Fig. 1. See details in Applications section.
This furnace must be installed with a direct-vent (combustion air
and flue) system and a factory accessory termination kit. In a
direct-vent system, all air for combustion is taken directly from the
outside atmosphere and all flue products are discharged to the
outside atmosphere. See furnace and factory accessory termination
kit instructions for proper installation.
These furnaces are shipped with the following materials to assist in
proper furnace installation. These materials are shipped in the main
blower compartment.
Installer Packet includes:
Installation, Startup, and Operating Instructions
Service and Maintenance Instructions
User’s Information Manual
Warranty Certificate
Loose Parts Bag includes: Quantity
Pressure tube extension 1
Collector Box or condensate trap extension tube 1
Inducer housing drain tube 1
1/2-in CPVC street elbow 2
Drain tube coupling 1
Drain tube coupling grommet 1
Vent and combustion-air pipe support 2
Condensate trap hole filler plug 3
Vent and combustion-air intake hole filler plug 2
Combustion-air pipe perforated disk assembly 1
Vent Pipe Extension 1*
* ONLY supplied with some furnaces.
INTRODUCTION
The model 58MXA 4-way multipoise, Gas-Fired, Category IV,
direct-vent condensing furnace is available in model sizes ranging
in input capacities of 40,000 to 138,000 Btuh.
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 54-1999/ANSI
Z223.1-1999 and the Installation Standards, Warm Air Heating
and Air Conditioning Systems ANSI/NFPA 90B
•CANADA: National Standard of Canada, Natural Gas and
Propane Installation Code (NSCNGPIC) CSA B149.1-00
Step 2—General Installation
•US: NFGC and the NFPA 90B. For copies, contact the National
Fire Protection Association Inc., Batterymarch Park, Quincy,
MA 02269; or for only the NFGC contact the American Gas
Association, 400 N. Capitol, N.W., Washington DC 20001
•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 5.3 of the NFGC, Air for Combustion and
Ventilation
•CANADA: Part 7 of the 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.
Step 5—Acoustical Lining and Fibrous Glass Duct
•US and CANADA: current edition of SMACNA, 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 2,3,4, and 9 and national plumbing codes
•CANADA: NSCNGPIC Parts 3, 4, 5, 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
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
Electrostatic discharge can affect electronic components.
Take precautions 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 hand during
grounding will be discharged.
3. You may proceed to service the control or connecting wires as
long as you do nothing to recharge your body (moving or
shuffling feet, touching ungrounded objects, etc.).
4. If you touch ungrounded objects, firmly touch a clean,
unpainted metal surface again before touching control or
wires.
5. Before removing a new control from its container, discharge
your body’s charge to ground. If the control is to be installed
in a furnace, follow items 1 through 4 before bringing the
3
→
→

Fig. 2—Dimensional Drawing
Dimensions (in.)
UNIT SIZE A D E
040-08 17-1/2 15-7/8 16
040-12 17-1/2 15-7/8 16
060-08 17-1/2 15-7/8 16
060-12 17-1/2 15-7/8 16
060-16 17-1/2 15-7/8 16
080-12 17-1/2 15-7/8 16
080-16 17-1/2 15-7/8 16
080-20 21 19-3/8 19-1/2
100-16 21 19-3/8 19-1/2
100-20 21 19-3/8 19-1/2
120-20 24-1/2 22-7/8 23
140-20 24-1/2 22-7/8 23
A02149
17
5
⁄ 16 "
24
1
⁄ 2 "
27
9
⁄ 16 "
TYP
27
5
⁄ 8 "
29
11
⁄ 16 "
TYP
30
13
⁄ 16 "
32
5
⁄ 8 "
TYP
33
1
⁄ 4 "
TYP
CONDENSATE
DRAIN TRAP
LOCATION
(ALTERNATE
UPFLOW)
7⁄8-IN. DIA
ACCESSORY
POWER ENTRY
7⁄8-IN. DIA
POWER CONN
CONDENSATE DRAIN
TRAP LOCATION
(DOWNFLOW &
HORIZONTAL LEFT)
26
15
⁄ 16 "
24
1
⁄ 2 "
22
5
⁄ 16 "
2
-IN. COMBUSTION-
AIR CONN
1
⁄ 2 -IN. DIA
GAS CONN
2 -IN.VENT CONN
1⁄2-IN. DIA THERMOSTAT
ENTRY
22
11
⁄ 16 "
SIDE INLET
23
1
⁄ 4 " TYP
SIDE INLET
1
1
⁄ 4 "
1"E
INLET
11
⁄ 16 "
11
⁄ 16 "
D
13
⁄ 16 "
13
⁄ 16 "
OUTLET
A
AIRFLOW
OUTLET
26
15
⁄ 16 "
28
1
⁄ 2 "
22
5
⁄ 16 "
19"
13
⁄ 16 "
5
⁄ 8 "
5
⁄ 16 "
1"
39
7
⁄ 8 "
22
1
⁄ 4 " TYP
11
⁄ 16 "
7
⁄ 16 "
24
3
⁄ 16 "
BOTTOM INLET
18
1
⁄ 4 "
22
11
⁄ 16 "
CONDENSATE DRAIN
TRAP LOCATION
(DOWNFLOW &
HORIZONTAL RIGHT)
OR ALTERNATE
1
⁄ 2 -IN. DIA GAS CONN
2-IN. COMBUSTION-
AIR CONN
1⁄2-IN. DIA
GAS CONN
7⁄8-IN. DIA
POWER CONN
1⁄2-IN. DIA
THERMOSTAT ENTRY
2-IN.VENT CONN
DIMPLE LOCATORS
FOR HORIZONTAL
HANGING
14
1
⁄ 2 "
TYP SIDE INLET
NOTES: 1. Minimum return-air openings at furnace, based on metal duct.If flex duct is used,
see flex duct manufacturer’s recommendations for equivalent diameters.
2. Minimum return-air opening at furnace:
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 23
1/4
-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 at 0.5 W.C.ESP.
9
7
⁄ 16 "
TYP
26
15
⁄ 16 " TYP
CONDENSATE
DRAIN LOCATION
(UPFLOW)
30
1
⁄ 2 "
9
⁄ 16 "
TYP
CONDENSATE
DRAIN LOCATION
(UPFLOW)
26
1
⁄ 4 "
26
1
⁄ 4 "
4

control or yourself in contact with the furnace. Put all used and
new controls into containers before touching ungrounded
objects.
APPLICATIONS
Local codes may require a drain pan under entire furnace and
condensate trap when a condensing furnace is used in an attic
application or over a finished ceiling.
Step 1—General
Some assembly and modifications are required for furnaces
installed in any of the 4 applications shown in Fig. 1. All drain and
pressure tubes are connected as shown in Fig. 6. See appropriate
application instructions for these procedures.
Step 2—Upflow Applications
An upflow furnace application is where furnace blower is located
below combustion and controls section of furnace, and conditioned
air is discharged upwards.
CONDENSATE TRAP LOCATION (FACTORY-SHIPPED
ORIENTATION)
The condensate trap is factory installed in the blower shelf and
factory connected for UPFLOW applications. A factory-supplied
tube is used to extend the condensate trap drain connection to the
desired furnace side for field drain attachment. See Condensate
Trap Tubing (Factory-Shipped Orientation) section for drain tube
extension details.See Fig. 5.
Fig. 3—Clearances to Combustibles
A02148
This forced air furnace is equipped for use with natural gas at altitudes 0 - 10,000 ft (0 - 3,050m), except 140 size Furnaces are only approved for altitudes 0 - 7,000 ft. (0 - 2,135m).
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 in a manufactured (mobile) home when stated on rating plate and using factory
authorizedkit.
This furnace may be installed on combustible flooring in alcove or closet at minimum clearance from combustible material.
This appliance requires a special venting system. Refer to the installation instructions for parts list and method of installation. This furnace is for use with schedule-40 PVC, PVC-DWV,
CPVC, or ABS-DWV pipe, and must not be vented in common with other gas-fired appliances. Construction through which vent/air intake pipes may be installed is maximum 24 inches
(600 mm), minimum3/4 inches (19 mm) thickness (including roofing materials).
MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION
Cette fournaise àair pulséest équipée pour utilisation avecgaz naturel et altitudes comprises entre 0 - 3,050m
(0-10,000 pi), exceptéqueles fournaises de140 taille sont pour altitudes comprises entre 0 - 2,135m(0 - 7,000 pi).
Utiliser une trousse de conversion, fournie par le fabricant, pour passer au gaz propane ou pour certaines installations au gaz naturel.
Cettefournaiseàair pulséest pour installation àl´intérieur dans un bâtiment construit sur place. Cette fournaise àair pulsépeut êtreinstallée dans une maison préfabriquée
(maison mobile) si prescrit par la plaque signalétique et si l´on utilise une trousse specifiée par le fabricant.
Cette fournaise peut être installée sur un plancher combustible dans un enfoncement ou un placard en observant les dégagements minimums avec les matériaux combustibles.
Cet appareil nécessite un système d´évacuation spécial. La méthoded´installation et la liste des pièces nécessaires figurent dans les instructions d´installation.Cette fournaise doit
s´utiliser avec la tuyauterie des nomenclatures 40 PVC, PVC-DWV, CPVC, ou ABS-DWVet elle ne peut pas être ventilée conjointment avec d´autres appareils àgaz. Épaisseur de la
construction au travers de laquelle il est possible de faire passer les tuyaux d´aération (admission/évacuation): 24 po (600 mm) maximum, 3/4 po (19 mm) minimum (y compris la toiture).
*
Minimum front clearance for service 30 inches (762mm).
140 size furnaces require 1 inch back clearance to combustible materials.
For installation on combustible floors only when installed on special base No. KGASB0201ALL, Coil
Assembly, Part No. CD5 or CK5, or Coil Casing, Part No. KCAKC.
Line contact is permissible only between lines formed by intersections of top and two sides of furnace
jacket, and building joists, studs, or framing.
Clearance shown is for air inlet and air outlet ends.
120 and 140 size furnaces require 1 inch bottom clearance to combustible materials.
Ø
Clearance in inches
Dégagement (po).
Vent clearance to
combustibles 0".
0 (po) Dégagement
d´évent avec combustibles.
Dégagement avant minimumde 762mm(30 po) pour l´entretien.
Pour les fournaises de 140 taille, 1 po (25mm) dégagement des matériaux combustibles est requis
au-arriere.
Pour l´installation sur le plancher combustible seulement quand on utilise la base spéciale, pièce
n°KGASB0201ALL, l´ensemble serpentin, pièce n°CD5 ou CK5, ou le carter de serpentin, pièce
n°KCAKC.
Le contact n´est permis qúentre les lignes formées par les intersections du dessus et des deuxcôtés de la
chemise de la fournaise, et des solives, des montants ou de la charpente du bátiment.
La distance indiquée concerne l´extrémitédu tuyau d´arrivée d´air et l´extrémitédutuyau de sortie d´air.
Pour les fournaises de 120 et 140 taille, 1 po (25mm) dégagement des matériaux combustibles est requis
au-dessous.
This furnace is approved for UPFLOW, DOWNFLOW and
HORIZONTAL installations.
Cette fournaise est approuvée pour l´installation HORIZONTALE
et la circulation d´air VERS LE HAUT et VERS LE BAS.
*
BOTTOM
DESSOUS
0"
Ø
3"
0"
§
0"
TOP/PLENUM
DESSUS/CHAMBRE D´AIR
1"
0"
§
30
MIN
ALL POSITIONS:
DOWNFLOW POSITIONS:
HORIZONTAL POSITIONS:
SIDE
COTES
FRONT
AVANT
BCK
ARRIE
A
E
R
SERVIE
C
LÈNTRT
EN
E
I
V
AN
AT
FRONT
SIDE
COTES
FOU
U
FRNACS
EE
I
A
RN
Les fléches de dégagement
ne change pas avec
l´orientation de la
générateur d´air chaud.
Clearance arrows
do not change with
furnace orientation.
†
†
††
HORIZONTAL
UPFLOW OR
DOWNFLOW
1/2" MAX
FRONT FRONT
1/2" MAX
TO
MIN 1/4"
LEVEL (0")
TO
††
INSTALLATION
DÉGAGEMENT MINIMUM EN POUCES AVEC ÉLÉMENTS DE CONSTRUCTION COMBUSTIBLES
††
†
POUR LA POSITION HORIZONTALE:
POUR LA POSITION COURANT DESCENDANT:
POUR TOUS LES POSITIONS:
Ø
*
§
§
324999-201 REV. D (LIT TOP)
For upflow and downflow applications, furnace must be installed level, or pitched within 1/2"
of level. For a horizontal application, the furnace must be pitched minimum1/4" to
maximum of 1/2" forward for proper drainage. See Installation Manual for IMPORTANT unit
support details on horizontal applications.
Pour des applications de flux ascendant et descendant, la fournaise doit être installée de
niveau ou inclinée àpas plus de 1/2" du niveau. Pour une application horizontale, la
fournaise doit être inclinée entre minimum1/4" et maximum1/2" du niveau pour le drainage
approprié. Encas d'installation en position horizontale, consulter les renseignements
IMPORTANTS sur le support dans le manuel d'installation.
Fig. 4—Return-Air Temperature
A93042
5
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→

CONDENSATE TRAP TUBING (FACTORY-SHIPPED
ORIENTATION)
NOTE: See Fig. 6 or tube routing label on main furnace door to
confirm location of these tubes.
1. Collector Box Drain, Inducer Housing Drain, Relief Port, and
Pressure Switch Tubes.
These tubes should be factory attached to condensate trap and
pressure switch ready for use in UPFLOW applications. These
tubes can be identified by their connection location and also
by a color label on each tube. These tubes are identified as
follows: collector box drain tube (blue label), inducer housing
drain tube (violet label or molded), relief port tube (green
label), and pressure switch tube (pink label).
2. Condensate Trap Drain Tube
The condensate trap drain connection must be extended for
field attachment by doing the following:
a. Determine location of field drain connection. (See Fig. 2 or
6.)
NOTE: If internal filter or side Filter/Media Cabinet is used, drain
tube should be located to opposite side from casing of return duct
attachment to assist in filter removal.
b. Remove and discard casing drain hole plug button from
desired side.
c. Install drain tube coupling grommet (factory-supplied in
loose parts bag) in selected casing hole.
d. Slide drain tube coupling (factory-supplied in loose parts
bag) through grommet ensuring long end of coupling faces
blower.
e. Cement 2 factory-supplied 1/2-in. street CPVC elbows to
the rigid drain tube connection on the condensate trap. (See
Fig. 6.) These elbows must be cemented together and
cemented to condensate trap drain connection.
NOTE: Failure to use CPVC elbows may allow drain to kink and
prevent draining.
f. Connect larger diameter drain tube and clamp (factory-
supplied in loose parts bag) to condensate trap and clamp
securely.
g. Route tube to coupling and cut to appropriate length.
h. Attach tube to coupling and clamp securely.
CONDENSATE TRAP LOCATION (ALTERNATE UPFLOW
ORIENTATION)
An alternate location for the condensate trap is the left-hand side
of casing. (See Fig. 2 and 7.)
NOTE: If the alternate left-hand side of casing location is used,
the factory-connected drain and relief port tubes must be discon-
nected and modified for attachment. See Condensate Trap Tubing
(Alternate Upflow Orientation) section for tubing attachment.
To relocate condensate trap to the left-hand side, perform the
following:
Fig. 5—Condensate Trap
A93026
1⁄2OD
INDUCER HOUSING
DRAIN CONNECTION
1⁄4OD
COLLECTOR BOX TO
TRAP RELIEF PORT
5⁄8OD
COLLECTOR BOX
DRAIN CONNECTION
1⁄2-IN. PVC OR CPVC
SCREW HOLE FOR
UPFLOW OR DOWN-
FLOW APPLICATIONS
(OPTIONAL)
142
78
18
7
SLOT FOR SCREW
HORIZONTAL
APPLICATION
(OPTIONAL)
WIRE TIE
GUIDES
(WHEN USED)
12
1
34
1
34
FRONT VIEW SIDE VIEW
FURNACE
DOOR
FURNACE
DOOR CONDENSATE
TRAP
78
14
26
4
FURNACE
SIDE
FURNACE
SIDE
12
1
14
26
434
534 5
4
SIDE VIEW FRONT VIEW END VIEW FRONT VIEW
34
DOWNFLOW AND ALTERNATE
EXTERNAL UPFLOW APPLICATIONS HORIZONTAL
APPLICATIONS
FIELD
DRAIN
CONN
FIELD
DRAIN
CONN
CONDENSATE
TRAP (INSIDE)
BLOWER SHELF
ALTERNATE DRAIN
TUBE LOCATION
UPFLOW APPLICATIONS
CONDENSATE TRAP
DRAIN TUBE LOCATION
6

1. Remove 3 tubes connected to condensate trap.
2. Remove trap from blower shelf by gently pushing tabs inward
and rotating trap.
3. Install casing hole filler cap (factory-supplied in loose parts
bag) into blower shelf hole where trap was removed.
4. Install condensate trap into left-hand side casing hole by
inserting tube connection stubs through casing hole and
rotating until tabs snap into locking position.
5. Fill unused condensate trap casing holes with plastic filler
caps (factory-supplied in loose parts bag).
CONDENSATE TRAP TUBING (ALTERNATE UPFLOW
ORIENTATION)
NOTE: See Fig. 7 or tube routing label on main furnace door to
confirm location of these tubes.
1. Collector Box Drain Tube
Connect collector box drain tube (blue label) to condensate
trap.
NOTE: On 17-1/2 in. wide furnaces ONLY, cut tube between
corrugated sections to prevent kinks from occurring.
2. Inducer Housing Drain Tube
a. Remove and discard LOWER (molded) inducer housing
drain tube which was previously connected to condensate
trap.
b. Use inducer housing drain extension tube (violet label and
factory-supplied in loose parts bag) to connect LOWER
inducer housing drain connection to the condensate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.
3. Relief Port Tube
a. Connect relief port tube (green label) to condensate trap.
b. Extend this tube (if required) by splicing to small diameter
tube (factory-supplied in loose parts bag).
c. Determine appropriate length, cut, and connect tube.
CONDENSATE TRAP FIELD DRAIN ATTACHMENT
Refer to Condensate Drain section for recommendations and
procedures.
PRESSURE SWITCH TUBING
The LOWER collector box pressure tube (pink label) is factory
connected to the pressure switch and should not require any
modification.
NOTE: See Fig. 6 or 7 or tube routing label on main furnace door
to check for proper connections.
UPPER COLLECTOR BOX AND INDUCER HOUSING
(UNUSED) DRAIN CONNECTIONS
Upper Collector Box Drain Connection
Attached to the UPPER collector box drain connection is a
factory-installed corrugated, plugged tube (blue and white striped
label). This tube is plugged to prevent condensate leakage in this
application. Ensure this tube is plugged.
Fig. 6—Factory-Shipped Upflow Tube
Configuration (Shown with Blower Access Panel
Removed)
A94163
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX
TUBE (GREEN)
INDUCER HOUSING
(MOLDED) DRAIN
TUBE (BEHIND
COLLECTOR BOX
DRAIN TUBE)
COLLECTOR BOX
DRAIN TUBE (BLUE)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
COUPLING (LEFT
DRAIN OPTION)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
FIELD-INSTALLED
FACTORY-SUPPLIED
1⁄2-IN. CPVC STREET
ELBOWS (2) FOR
LEFT DRAIN OPTION
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
COUPLING (RIGHT
DRAIN OPTION)
CAP
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
PLUG
CONDENSATE
TRAP
Fig. 7—Alternate Upflow Configuration and Trap
Location
A94164
COLLECTOR BOX
TUBE (PINK)
CONDENSATE
TRAP
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR BOX
DRAIN TUBE (BLUE)
INDUCER
HOUSING
DRAIN TUBE
(VIOLET)
CAP
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
PLUG
7

NOTE: See Fig. 6 or 7 or tube routing label on main furnace door
to check for proper connections.
Upper Inducer Housing Drain Connection
Attached to the UPPER (unused) inducer housing drain connection
is a cap and clamp. This cap is used to prevent condensate leakage
in this application. Ensure this connection is capped.
NOTE: See Fig. 6 or 7 or tube routing label on main furnace door
to check for proper connections.
CONDENSATE TRAP FREEZE PROTECTION
Refer to Condensate Drain Protection section for recommenda-
tions and procedures.
Step 3—Downflow Applications
A downflow furnace application is where furnace blower is located
above combustion and controls section of furnace, and conditioned
air is discharged downwards.
CONDENSATE TRAP LOCATION
The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2, 8, or 9.
To relocate condensate trap from the blower shelf to desired
location, perform the following:
1. Remove 3 tubes connected to condensate trap.
2. Remove trap from blower shelf by gently pushing tabs inward
and rotating trap.
3. Remove casing hole filler cap from casing hole. (See Fig. 2, 8,
or 9.)
4. Install casing hole filler cap into blower shelf hole where trap
was removed.
5. Install condensate trap into desired casing hole by inserting
tube connection stubs through casing hole and rotating until
tabs snap into locking position.
CONDENSATE TRAP TUBING
NOTE: See Fig. 8 or 9 or tube routing label on main furnace door
to check for proper connections.
Relocate tubes as described below.
1. Collector Box Drain Tube
a. Remove factory-installed plug from LOWER collector box
drain tube (blue and white striped label).
b. Install removed clamp and plug into UPPER collector box
drain tube (blue label) which was connected to condensate
trap.
c. Connect LOWER collector box drain connection to con-
densate trap.
(1.) Condensate Trap Located on Left Side of Casing
(a.) Connect LOWER collector box drain tube (blue
and white striped label) to condensate trap. Tube
does not need to be cut.
(b.) Clamp tube to prevent any condensate leakage.
(2.) Condensate Trap Located on Right Side of Casing
(a.) Install drain tube coupling (factory-supplied in
loose parts bag) into collector box drain tube
(blue and white striped label) which was previ-
ously plugged.
(b.) Connect larger diameter drain tube (factory-
supplied in loose parts bag) to drain tube cou-
pling, extending collector box drain tube for
connection to condensate trap.
PLUG
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
COLLECTOR BOX
EXTENSION TUBE
CONDENSATE
TRAP
INDUCER HOUSING
DRAIN TUBE (VIOLET)
COLLECTOR BOX
EXTENSION TUBE
CAP
COLLECTOR BOX
DRAIN TUBE (BLUE)
A94165
Fig. 8—Downflow Tube Configuration (Left-Hand
Trap Installation)
PLUG
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
COLLECTOR BOX
EXTENSION
DRAIN TUBE
CONDENSATE
TRAP
INDUCER HOUSING
DRAIN TUBE
(VIOLET)
COLLECTOR BOX
EXTENSION TUBE
DRAIN TUBE
COUPLING
COLLECTOR BOX
DRAIN TUBE (BLUE)
CAP
COLLECTOR BOX
EXTENSION TUBE
A94166
Fig. 9—Downflow Tube Configuration (Right-Hand
Trap Installation)
8

(c.) Route extended collector box drain tube directly
from collector box drain to condensate trap as
shown in Fig. 9.
(d.) Determine appropriate length and cut.
(e.) Connect to condensate trap.
(f.) Clamp tube to prevent any condensate leakage.
2. Inducer Housing Drain Tube
a. Remove factory-installed cap and clamp from LOWER
inducer housing drain connection.
b. Remove and discard UPPER (molded) inducer housing
drain tube which was previously connected to condensate
trap.
c. Install cap and clamp on UPPER inducer housing drain
connection where molded drain tube was removed.
d. Use inducer housing drain tube (violet label and factory-
supplied in loose parts bag) to connect LOWER inducer
housing drain connection to the condensate trap.
e. Connect inducer housing drain connection to condensate
trap.
(1.) Condensate Trap Located on Left Side of Casing
(a.) Determine appropriate length and cut.
(b.) Connect tube to condensate trap.
(c.) Clamp tube to prevent any condensate leakage.
(2.) Condensate Trap Located on Right Side of Casing
(a.) Route inducer housing drain tube (violet label)
directly from inducer housing to condensate trap
as shown in Fig. 9.
(b.) Determine appropriate length and cut.
(c.) Connect tube to condensate trap.
(d.) Clamp tube to prevent any condensate leakage.
3. Relief Port Tube
Refer to Pressure Switch Tubing section for connection procedure.
CONDENSATE TRAP FIELD DRAIN ATTACHMENT
Refer to Condensate Drain section for recommendations and
procedures.
PRESSURE SWITCH TUBING
One collector box pressure tube (pink label) is factory connected to
the pressure switch for use when furnace is installed in UPFLOW
applications This tube MUST be disconnected and used for the
condensate trap relief port tube. The other collector box pressure
tube (green label) which was factory connected to the condensate
trap relief port connection MUST be connected to the pressure
switch in DOWNFLOW or HORIZONTAL RIGHT applications.
NOTE: See Fig. 7 or 8 or tube routing label on main furnace door
to check for proper connections.
1. Disconnect collector box pressure tube (pink label) attached to
pressure switch.
2. Extend collector box pressure tube (green label) which was
previously connected to condensate trap relief port connection
by splicing to small diameter tube (factory-supplied in loose
parts bag).
3. Connect collector box pressure tube (green label) to pressure
switch connection labeled COLLECTOR BOX.
4. Extend collector box pressure tube (pink label) which was
previously connected to pressure switch by splicing to remain-
ing small diameter tube (factory-supplied in loose parts bag).
5. Route this extended tube (pink label) to condensate trap relief
port connection.
6. Determine appropriate length, cut, and connect tube.
7. Clamp tube to relief port connection.
CONDENSATE TRAP FREEZE PROTECTION
Refer to Condensate Drain Protection section for recommenda-
tions and procedures.
Step 4—Horizontal Left (Supply-Air Discharge)
Applications
A horizontal left furnace application is where furnace blower is
located to the right of combustion and controls section of furnace,
and conditioned air is discharged to the left.
CONDENSATE TRAP LOCATION
The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2 or 10.
To relocate condensate trap from the blower shelf to desired
location, perform the following:
1. Remove 3 tubes connected to condensate trap.
2. Remove trap from blower shelf by gently pushing tabs inward
and rotating trap.
3. Install casing hole filler cap (factory-supplied in loose parts
bag) into blower shelf hole where trap was removed.
4. Install condensate trap into left-hand side casing hole by
inserting tube connection stubs through casing hole and
rotating until tabs snap into locking position.
5. Fill unused condensate trap casing holes with plastic filler
caps (factory-supplied in loose parts bag).
CONDENSATE TRAP TUBING
NOTE: See Fig. 10 or tube routing label on main furnace door to
check for proper connections.
1. Collector Box Drain Tube
a. Install drain tube coupling (factory-supplied in loose parts
bag) into collector box drain tube (blue label) which was
previously connected to condensate trap.
b. Connect large diameter drain tube and clamp (factory-
supplied in loose parts bag) to drain tube coupling, extend-
ing collector box drain tube.
c. Route extended tube (blue label) to condensate trap and cut
to appropriate length.
d. Clamp tube to prevent any condensate leakage.
2. Inducer Housing Drain Tube
a. Remove and discard LOWER (molded) inducer housing
drain tube which was previously connected to condensate
trap.
b. Use inducer housing drain extension tube (violet label and
factory-supplied in loose parts bag) to connect LOWER
inducer housing drain connection to the condensate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.
3. Relief Port Tube
a. Extend collector box tube (green label) which was previ-
ously connected to the condensate trap by splicing to small
diameter tube (factory-supplied in loose parts bag).
b. Route extended collector box pressure tube to relief port
connection on the condensate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.
9

CONDENSATE TRAP FIELD DRAIN ATTACHMENTS
Refer to Condensate Drain section for recommendations and
procedures.
PRESSURE SWITCH TUBING
The LOWER collector box pressure tube (pink label) is factory
connected to the pressure switch for use when furnace is installed
in UPFLOW applications. This tube MUST be disconnected,
extended, rerouted, and then reconnected to the pressure switch in
HORIZONTAL LEFT applications.
NOTE: See Fig. 10 or tube routing label on main furnace door to
check for proper connections.
Modify tube as described below.
1. Disconnect collector box pressure tube (pink label) attached to
pressure switch.
2. Use smaller diameter tube (factory-supplied in loose parts
bag) to extend tube disconnected in item 1.
3. Route extended tube:
a. Behind inducer housing.
b. Between blower shelf and inducer housing.
c. Behind inducer motor bracket.
d. Between inducer motor and pressure switch.
4. Determine appropriate length, cut, and reconnect tube to
pressure switch connection labeled COLLECTOR BOX.
CONDENSATE TRAP FREEZE PROTECTION
Refer to Condensate Drain Protection section for recommenda-
tions and procedures.
CONSTRUCT A WORKING PLATFORM
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 11.)
The condensate trap MUST be installed below furnace. See
Fig. 5 for dimensions. The drain connection to condensate
trap must also be properly sloped to an open drain.
NOTE: Combustion-air and vent pipes are restricted to a mini-
mum length of 5 ft. (See Table 7.)
NOTE: A 12-in. minimum offset pipe section is recommended
with short (5 to 8 ft) vent systems. This recommendation is to
reduce excessive condensate droplets from exiting the vent pipe.
(See Fig. 11 or 34.)
Step 5—Horizontal Right (Supply-Air Discharge)
Applications
A horizontal right furnace application is where furnace blower is
located to the left of combustion and controls section of furnace,
and conditioned air is discharged to the right.
Local codes may require a drain pan under entire furnace and
condensate trap when a condensing furnace is used in attic
application or over a finished ceiling.
NOTE: In Canada, installations shall be in accordance with
current NSCNGPIC Installation Codes and/or local codes.
NOTE: The auxiliary junction box (J-Box) MUST be relocated to
opposite side of furnace casing. (See Fig. 12) See Electrical
Connection section for J-Box relocation.
Fig. 10—Horizontal Left Tube Configuration
A00215
CONDENSATE
TRAP
AUXILIARY "J"BOX
PLUG
CAP
INDUCER HOUSING
DRAIN TUBE (VIOLET)
COLLECTOR BOX
DRAIN TUBE (BLUE)
COLLECTOR BOX TUBE (PINK)
RELOCATE TUBE BETWEEN BLOWER SHELF AND INDUCER HOUSING FOR
040, 060, AND 080 HEATING INPUT FURNACES
COLLECTOR BOX
EXTENSION TUBE
COLLECTOR BOX
DRAIN TUBE
(BLUE AND WHITE STRIPED)
DRAIN TUBE COUPLING
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR
BOX EXTENSION
DRAIN TUBE
10

CONDENSATE TRAP LOCATION
The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2 or 12.
To relocate condensate trap from the blower shelf to desired
location, perform the following:
1. Remove 3 tubes connected to condensate trap.
2. Remove trap from blower shelf by gently pushing tabs inward
and rotating trap.
3. Install casing hole filler cap (factory-supplied in loose parts
bag) into blower shelf hole where trap was removed.
4. Install condensate trap into left-hand side casing hole by
inserting tube connection stubs through casing hole and
rotating until tabs snap into locking position.
5. Fill unused condensate trap casing holes with plastic filler
caps (factory-supplied in loose parts bag).
CONDENSATE TRAP TUBING
NOTE: See Fig. 12 or tube routing label on main furnace door to
check for proper connections.
1. Collector Box Drain Tube
a. Remove factory-installed plug from LOWER collector box
drain tube (blue and white striped label).
b. Install removed clamp and plug into UPPER collector box
drain tube (blue label) which was previously connected to
condensate trap.
c. Connect LOWER collector box drain tube (blue and white
striped label) to condensate trap. Tube does not need to be
cut.
d. Clamp tube to prevent any condensate leakage.
2. Inducer Housing Drain Tube
a. Remove factory-installed cap and clamp from LOWER
inducer housing drain connection.
b. Remove and discard UPPER (molded) inducer housing
drain tube which was previously connected to condensate
trap.
c. Install cap and clamp on UPPER inducer housing drain
connection where molded drain tube was removed.
d. Use inducer housing drain extension tube (violet label and
factory-supplied in loose parts bag) to connect LOWER
inducer housing drain connection to condensate trap.
e. Determine appropriate length, cut, and connect tube to
condensate trap.
f. Clamp tube to prevent any condensate leakage.
3. Relief Port Tube
Refer to Pressure Switch Tubing section for connection
procedure.
CONDENSATE TRAP FIELD DRAIN ATTACHMENT
Refer to Condensate Drain section for recommendations and
procedures.
PRESSURE SWITCH TUBING
One collector box pressure tube (pink label) is factory connected to
the pressure switch for use when furnace is installed in UPFLOW
applications. This tube MUST be disconnected and used for the
condensate trap relief port tube. The other collector box pressure
tube (green label) which was factory connected to the condensate
trap relief port connection MUST be connected to the pressure
switch in DOWNFLOW or HORIZONTAL RIGHT applications.
Fig. 11—Attic Location and Working Platform
A93031
COMBUSTION –AIR
INTAKE VENT
MANUAL
SHUTOFF
GAS VALVE
SEDIMENT
TRAP CONDENSATE
TRAP
DRAIN
ACCESS OPENING
FOR TRAP
30″MIN
WORK AREA
A 12-IN. MIN HORIZONTAL PIPE
SECTION IS RECOMMENDED WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE DROPLETS FROM
EXITING THE VENT PIPE.
5 3⁄4″
NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE
FURNACE AND CONDENSATE TRAP WHEN A CONDENSING
FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.
11

NOTE: See Fig. 12 or tube routing label on main furnace door to
check for proper connections.
Relocate tubes as described below.
1. Disconnect collector box pressure tube (pink label) attached to
pressure switch.
2. Extend collector box pressure tube (green label) which was
previously connected to condensate trap relief port connection
by splicing to small diameter tube (factory-supplied in loose
parts bag).
3. Route extended collector box pressure tube behind inducer
motor bracket then between inducer motor and pressure
switch.
4. Connect collector box pressure tube (green label) to pressure
switch connection labeled COLLECTOR BOX.
5. Use remaining smaller diameter tube (factory-supplied in
loose parts bag) to extend collector box pressure tube (pink
label) which was previously connected to pressure switch.
6. Route this extended tube (pink label) to condensate trap relief
port connection.
7. Determine appropriate length, cut, and connect tube.
8. Clamp tube to relief port connection.
CONDENSATE TRAP FREEZE PROTECTION
Refer to Condensate Drain Protection section for recommenda-
tions and procedures.
CONSTRUCT A WORKING PLATFORM
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 11.)
The condensate trap MUST be installed below furnace. See
Fig. 5 for dimensions. The drain connection to condensate
trap must also be properly sloped to an open drain.
NOTE: Combustion-air and vent pipes are restricted to a mini-
mum length of 5 ft. (See Table 7.)
NOTE: A 12-in. minimum offset pipe section is recommended
with short (5 to 8 ft) vent systems. This recommendation is to
reduce excessive condensate droplets from exiting the vent pipe.
(See Fig. 11 or 34.) LOCATION
Step 1—General
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 so combustion-air and vent pipe maximum lengths
are not exceeded. Refer to Table 7.
•be located where available electric power and gas supplies meet
specifications on the furnace rating plate.
•be attached to an air distribution system and be located as close
to the center of the distribution system as possible. Refer to Air
Ducts section.
•be provided with ample space for servicing and cleaning.
Always comply with minimum fire protection clearances
shown on the furnace clearance to combustible label.
This furnace may be located in a confined space without special
provisions for dilution or ventilation air. When a furnace is
installed so that supply ducts carry air to areas outside the space
containing the furnace, return air must also be handled by ducts
sealed to furnace casing. The ducts terminate outside the space
containing the furnace to ensure there will not be a negative
pressure condition within equipment room or space.
Fig. 12—Horizontal Right Tube Configuration
A00214
PLUG
COLLECTOR BOX DRAIN TUBE
(BLUE AND WHITE STRIPED)
INDUCER HOUSING
DRAIN TUBE (VIOLET)
COLLECTOR BOX
EXTENSION TUBE
COLLECTOR BOX TUBE (GREEN)
CAP COLLECTOR BOX DRAIN TUBE (BLUE)
COLLECTOR BOX TUBE (PINK)
CONDENSATE
TRAP
COLLECTOR BOX EXTENSION TUBE
AUXILARY “J”BOX RELOCATED HERE
12

NOTE: For upflow/downflow applications install furnace so that
it is level or pitched forward within 1/2-in. for proper furnace
operation. For horizontal applications pitch 1/4-in. minimum to
1/2-in. maximum to ensure proper condensate drainage from
secondary heat exchangers. (See Fig. 13.)
Do not install furnace on its back. Safety control operation
will be adversely affected. Never connect return-air ducts to
back of furnace. Failure to follow this warning could result in
fire, personal injury, or death. (See Fig. 14.)
Do not operate this furnace during construction. If the furnace
is required for temporary heating of buildings or structures
under construction, use clean outside air free of chlorine and
fluorine compounds for combustion and ventilation. These
compounds form acids that corrode the heat exchangers.
These compounds are found in paneling and dry wall adhe-
sives, paints, thinners, masonry cleaning materials, and many
other materials.
If these furnaces are installed in an unconditioned space
where the ambient temperatures may be 32°F or lower, freeze
protection measures must be taken. (See Fig. 15.)
Step 2—Furnace Location Relative to Cooling
Equipment
The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air must prevent chilled air from entering furnace.
If dampers are manually operated, they must be equipped with a
means to prevent operation of either unit unless damper is in
full-heat or full-cool position.
Step 3—Hazardous Locations
When furnace is installed in a residential garage, it must be
installed so that burners and ignition sources are located a
minimum of 18 in. above floor. The furnace must be located
or protected to avoid physical damage by vehicles. When
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, unit must be
installed in accordance with NFGC or NSCNGPIC. (See Fig.
16.)
INSTALLATION
Step 1—Leveling Legs (If Desired)
When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 17.) Install field-supplied,
corrosion-resistant 5/16-in. machine bolts and nuts.
NOTE: The maximum length of bolt should not exceed 1-1/2 in.
Fig. 13—Furnace Location for Proper Condensate
Drainage
A02146
UPFLOW OR DOWNFLOW HORIZONTAL
FRONT
LEVEL (0″)
TO
1⁄2″MAX MIN 1⁄4″
TO
1⁄2″MAX
FRONT
Fig. 14—Prohibit Installation on Back
A93043
FRONT
BACK
FRONT
B
A
C
K
Fig. 15—Freeze Protection
A93058
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
Fig. 16—Installation in a Garage
A93044
18-IN. MINIMUM
TO BURNERS
13
→
→
→

1. Position furnace on its back. Locate and drill a 5/16–in.
diameter hole in each bottom corner of furnace. (See Fig. 17.)
Holes in bottom closure panel may be used as guide locations.
2. For each hole, install nut on bolt and then install bolt and nut
in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height, and tighten inside
nut to secure arrangement.
NOTE: Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.
Step 2—Installation in Upflow and Downflow
Applications
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when special base (available from
manufacturer) Part No. KGASB0201ALL is used. Special base is
not required when this furnace is installed on manufacturer’s Coil
Assembly Part No. CD5 or CK5, or Coil Box Part No. KCAKC is
used.
1. Determine application being installed from Table 1.
2. Construct hole in floor per dimensions specified in Table 1
and Fig. 18.
3. Construct plenum to dimensions specified in Table 1 and Fig.
18.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 19.
If Coil Assembly Part No. CD5 or CK5 or Coil Box Part No.
KCAKC is used, install as shown in Fig. 20.
NOTE: Remove furnace perforated, discharge duct flanges when
they interfere with mating flanges on coil on downflow subbase.
To remove furnace perforated, discharge duct flange, use wide
duct pliers or duct flange tool to bend flange back and forth until
it breaks off. Be careful of sharp edges. (See Fig. 21.)
Do not bend duct flanges inward as shown in Fig. 21. This
will affect airflow across heat exchangers and may cause limit
cycling or premature heat exchanger failure. Remove duct
flange completely or bend it inward a minimum of 210°as
shown in Fig. 21.
NOTE: For 140 size unit when installed in downflow orientation,
cut the white jumper wire off between terminals PL1-7 and PL1-9.
Do not cut white jumper between terminals PL1-7 and PLI-11.
Refer to Fig. 30 for location of jumper. Cut jumper close to
connector and remove wire to avoid a short circuit.
Fig. 17—Leveling Legs
A89014
1 3⁄4″
1 3⁄4″
1 3⁄4″
1 3⁄4″
5⁄16″
5⁄16″
5⁄16″
5⁄16″
Fig. 18—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
BD
FLOOR
OPENING
Fig. 19—Furnace, Plenum, and Subbase Installed
on a Combustible Floor
A96285
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
14

Step 3—Installation in Horizontal Applications
These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, furnace can either
be hung from floor joist or installed on suitable blocks or pad.
Furnace can be suspended from each corner by hanger bolts and
angle iron supports. (See Fig. 22.) Cut hanger bolts (4 each 3/8-in.
all-thread rod) to desired length. Use 1 X 3/8-in. flat washers,
3/8-in. lock washers, and 3/8-in. nuts on hanger rods as shown in
Fig. 22. Dimples are provided for hole locations. (See Fig. 2.)
Table 1—Opening Dimensions (in.)
FURNACE
CASING
WIDTH APPLICATION PLENUM OPENING FLOOR OPENING
ABCD
17-1/2
Upflow Applications 16 24–1/8 16–5/8 24–3/4
Downflow Applications on Non-Combustible Flooring 15-7/8 19 16-1/2 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 15-1/8 19 16-3/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 15-1/2 19 16-1/2 20
21
Upflow Applications 19-1/2 24-1/8 20-1/8 24-3/4
Downflow Applications on Non-Combustible Flooring 19-3/8 19 20 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 18-5/8 19 20-1/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 19 19 20 20
24-1/2
Upflow Applications 23 24-1/8 23-5/8 24-3/4
Downflow Applications on Non-Combustible Flooring 22-7/8 19 23-1/2 19-5/8
Downflow Applications on Combustible Flooring Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 22-1/8 19 23-3/4 20-3/8
Downflow Applications on Combustible Flooring NOT Using
KGASB Subbase
Furnace with or without CD5 or CK5 Coil Assembly or
KCAKC Coil Box 22-1/2 19 23-1/2 20
Fig. 20—Furnace, Plenum, and Coil Assembly or
Coil Box Installed on a Combustible Floor
A96284
CD5 OR CK5
COIL ASSEMBLY
OR KCAKC
COIL BOX
FURNACE
SHEET METAL
PLENUM
FLOOR
OPENING
COMBUSTIBLE
FLOORING
Fig. 21—Duct Flanges
A93029
NO
YES
YES
PERFORATED
DISCHARGE DUCT
FLANGE
210°
MIN
15

The entire length of furnace MUST be supported when
furnace is used in a horizontal position to ensure proper
draining. When suspended, bottom brace supports sides and
center blower shelf. When unit is supported from the ground,
blocks or pad should support sides and center blower shelf
area.
Step 4—Air Ducts
GENERAL REQUIREMENTS
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA) or
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE) or consult factory The Air Systems Design
Guidelines reference tables available from your local distributor.
The duct system should be sized to handle the required system
design CFM at the design static pressure.
When a furnace is installed so that the supply ducts carry air to
areas outside the space containing the furnace, the return air must
also be handled by a duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-duct connections to furnace with code
approved tape or duct sealer.
Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration. Ductwork passing
through unconditioned space should be insulated to enhance
system performance. When air conditioning is used, a vapor
barrier is recommended.
Maintain a 1-in. clearance from combustible materials to supply air
ductwork for a distance of 36-in. horizontally from the furnace.
See NFPA 90B or local code for further requirements.
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air
stream. The cover attachment shall prevent leaks.
DUCTWORK ACOUSTICAL TREATMENT
Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-off may require internal
acoustical lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
SMACNA construction 18 standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
SUPPLY AIR CONNECTIONS
Upflow Furnaces
Connect supply-air duct to 3/4-in. flange on furnace supply-air
outlet. The supply-air duct attachment must ONLY be connected
Fig. 22—Crawlspace Horizontal Application
A93304
NOTES:
ANGLE
IRON OR
EQUIVALENT
(B)
(A) ROD LOCATION
USING DIMPLE
LOCATORS
(SEE DIMENSIONAL
DWG FOR
LOCATIONS)
13/16-IN. MAX
ALTERNATE SUPPORT
LOCATION FROM BACK
ALTERNATE SUPPORT
LOCATION 4-IN. MIN
8-IN. MAX
3⁄8-IN. ROD
(A) (B)
(A)
(B)
(B)
(A)
1. A 1 In. clearance minimum between top of
furnace and combustible material.
2. The entire length of furnace must be
supported when furnace is used in horizontal
position to ensure proper drainage.
(A) PREFERRED ROD LOCATION
(B) ALTERNATE ROD LOCATION
DRAIN
5 3⁄4″
3/8-IN. HEX NUT
& WASHER (4)
REQD PER ROD
16
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to furnace supply-/outlet-air duct flanges or air conditioning coil
casing (when used). DO NOT cut main furnace casing to attach
supply side air duct, humidifier, or other accessories. All accesso-
ries MUST be connected external to furnace main casing.
Downflow Furnaces
Connect supply-air duct to supply-air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used), when
installed on non-combustible material. When installed on combus-
tible material, supply-air duct attachment must ONLY be con-
nected to an accessory subbase or factory approved air condition-
ing coil casing. DO NOT cut main furnace casing to attach supply
side air duct, humidifier, or other accessories. All accessories
MUST be connected external to furnace main casing.
Horizontal Furnaces
Connect supply-air duct to supply air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used). DO NOT
cut main furnace casing to attach supply side air duct, humidifier,
or other accessories. All accessories MUST be connected external
to furnace main casing.
RETURN AIR CONNECTIONS
Never connect return-air ducts to the back of the furnace.
Return-air duct connections on furnace side(s) permitted in
upflow applications only. A failure to follow this warning
could result in fire, personal injury, or death.
Upflow Furnaces
The return-air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing as shown in Fig. 2 Bypass humidifier may be attached into
unused side return air portion of the furnace casing. DO NOT
connect any portion of return-air duct to back of furnace casing.
Downflow and Horizontal Furnaces
The return-air duct must be connected to return-air opening
provided as shown in Fig. 2. DO NOT cut into casing sides or back
to attach any portion of return-air duct. Bypass humidifier connec-
tions should be made at ductwork or coil casing sides exterior to
furnace.
Step 5—Filter Arrangement
Never operate unit without a filter or with filter access door
removed. Failure to follow this warning can cause fire,
personal injury, or death
The air filter arrangement will vary due to application, furnace
orientation, and filter type. The filter may be installed in an
external Filter/Media cabinet (if provided) or the furnace blower
compartment. Factory supplied washable filters are shipped in the
blower compartment.
If a factory-supplied external Filter/Media cabinet is provided,
instructions for its application, assembly, and installation are
packaged with the cabinet. The Filter/Media cabinet can be used
with the factory-supplied washable filter or a factory-specified
high-efficiency disposable filter (see cabinet instructions).
If installing the filter in the furnace blower compartment, deter-
mine location for filter and relocate filter retaining wire if
necessary. See Table 2 to determine correct filter size for desired
filter location. Table 2 indicates filter size, location, and quantity
shipped with this furnace. See Fig. 2 for location and size of
bottom and side return-air openings.
Use care when cutting support rods in filters to protect against
flying pieces and sharp rod ends. Wear safety glasses, gloves,
and appropriate protective clothing. Failure to follow this
caution could result in personal injury.
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.
NOTE: Side return-air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 23. Bottom
return-air opening may be used with all 4 orientations. Filter may
need to be cut to fit some furnace widths. Install filter as shown in
Fig. 24.
NOTE: Remove and discard bottom closure panel when bottom
inlet is used.
Step 6—Bottom Closure Panel
These furnaces are shipped with bottom enclosure panel installed
in bottom return-air opening. This panel MUST be in place when
side return air is used.
To remove bottom closure panel, perform following:
1. Tilt or raise furnace and remove 2 screws holding front filler
panel. (See Fig. 25.)
Table 2—Filter Information
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN.) FILTER
TYPE
Side Return Bottom Return
17–1/2 (1)16X25X1†(1)16X25X1†Cleanable
21 (1)16X25X1* (1)20X25X1†Cleanable
24–1/2 (1or2)16X25X1* (1)24X25X1†Cleanable
* Filters may be field modified by cutting filter material and support rods (3) in
filters. Alternate sizes and additional filters may be ordered from your dealer.
†Factory-provided with furnace.
Fig. 23—Filter Installed for Side Inlet
A93045
FILTER
RETAINER
WASHABLE
FILTER
17

2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
Step 7—Gas Piping
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the United States.
Canadian installations must be made in accordance with NSCNG-
PIC and all authorities having jurisdiction. Gas supply line should
be a separate line running directly from meter to furnace, if
possible. Refer to Table 3 for recommended gas pipe sizing. Risers
must be used to connect to furnace and to meter. Support all gas
piping with appropriate straps, hangers, etc. Use a minimum of 1
hanger every 6 ft. Joint compound (pipe dope) should be applied
sparingly and only to male threads of joints. Pipe dope must be
resistant to propane gas.
Connect gas pipe to furnace using a backup wrench to avoid
damaging gas controls.
Gas valve shutoff switch MUST be facing forward or tilted
upward. Failure to follow this warning could result in
property damage or death.
Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections, as specified in ″Adjustments″
section. A failure to follow this warning could result in fire,
explosion, personal injury, or death.
Use proper length of pipe to avoid stress on gas control
manifold. Failure to follow this warning could result in a gas
leak resulting in fire, explosion, personal injury, or death.
Install a sediment trap in riser leading to furnace. Trap can be
installed by connecting a tee to riser leading to furnace so
straight-through section of tee is vertical. Then connect a capped
nipple into lower end of tee. Capped nipple should extend below
level of gas controls. Place a ground joint union between gas
control manifold and manual gas shutoff valve. (See Fig. 26.)
If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at gas
valve and extend a minimum of 2 in. outside furnace casing.
If local codes allow the use of a flexible gas appliance connector,
always use a new listed connector. Do not use a connector which
has previously serviced another gas appliance.
Fig. 24—Bottom Filter Arrangement
A00213
WASHABLE
FILTER
FILTER
SUPPORT
FILTER
RETAINER
171⁄2-IN.WIDE
CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.
1″
24 1/2″
3″
Fig. 25—Removing Bottom Closure Panel
A93047
BOTTOM
CLOSURE
PANEL
FRONT FILLER
PANEL
Table 3—Maximum Capacity of Pipe*
NOMINAL
IRON
PIPE
SIZE
(IN.)
INTERNAL
DIAMETER
(IN.)
LENGTH OF PIPE (FT)
10 20 30 40 50
1/2 0.622 175 120 97 82 73
3/4 0.824 360 250 200 170 151
11.049 680 465 375 320 285
1-1/4 1.380 1400 950 770 660 580
1-1/2 1.610 2100 1460 1180 990 900
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14–in. wc) or less and a
pressure drop of 0.5–in wc (based on a 0.60 specific gravity gas).
Ref: Table 9–2 NFGC.
18
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FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in
serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the
detection of leaks to check all connections. A fire or explo-
sion may result causing property damage, personal injury or
loss of life.
An accessible manual shutoff valve MUST be installed upstream
of furnace gas controls and within 6 ft of furnace. A 1/8-in. NPT
plugged tapping, accessible for test gage connection, MUST be
installed immediately upstream of gas supply connection to
furnace and downstream of manual shutoff valve.
NOTE: The gas valve inlet press tap connection is suitable to use
as test gage connection providing test pressure DOES NOT exceed
maximum 0.5 psig (14-in. wc) stated on gas valve. (See Fig. 57.)
Piping should be pressure and leak tested in accordance with
NFGC in the United States or NSCNGPIC in Canada, local, and
national plumbing and gas codes before the furnace has been
connected. After all connections have bee made, purge lines and
check for leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14-in. wc), gas supply pipe must be
disconnected from furnace and capped before pressure test. If test
pressure is equal to or less than 0.5 psig (14-in. wc), turn off
electric shutoff switch located on gas valve before test. It is
recommended that ground joint union be loosened before pressure
testing. After all connections have been made, purge lines and
check for leakage.
Step 8—Electrical Connections
See Fig. 27 for field wiring diagram showing typical field 115-v
and 24-v wiring. Check all factory and field electrical connections
for tightness.
Blower access panel door switch opens 115-v power to
control center. No component operation can occur. Do not
bypass or close switch with panel removed. Failure to follow
this warning could result in personal injury or death.
Furnace control must be grounded for proper operation or
control will lock out. Control is grounded through
green/yellow wire routed to gas valve and burner box screw.
115–V WIRING
Before proceeding with electrical connections, make certain that
voltage, frequency, and phase correspond to that specified on unit
rating plate. Also, check to be sure that service provided by utility
is sufficient to handle load imposed by this equipment. Refer to
rating plate or Table 4 for equipment electrical specifications.
Make all electrical connections in accordance with National
Electrical Code (NEC) ANSI/NFPA 70-2002 and any local codes
or ordinances that might apply. For Canadian installations, all
electrical connections must be made in accordance with Canadian
Electrical Code CSA C22.1 or authorities having jurisdiction. Use
a separate, fused branch electrical circuit containing a properly
sized fuse or circuit breaker for this furnace. See Table 4 for wire
size and fuse specifications. A disconnecting means must be
located within sight from and readily accessible to furnace.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control center LED status indicator light will
flash rapidly and furnace will NOT operate.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire. (See Fig. 28.)
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-2002 and Canadian Elec-
trical Code CSA C22.1 or local codes to minimize personal
injury if an electrical fault should occur. This may consist of
electrical wire or conduit approved for electrical ground when
installed in accordance with existing electrical codes. Do not
use gas piping as an electrical ground. Failure to follow this
warning could result in electrical shock, fire, or death.
J-Box Relocation
1. Remove 2 screws holding auxiliary J-box. (See Fig. 29.)
2. Rotate J-box 180°and attach box to left side, using holes
provided.
If manual disconnect switch is to be mounted on furnace,
select a location where a drill or fastener will not contact
electrical or gas components.
24–V WIRING
Make field 24-v thermostat connections at 24-v terminal block on
control center. For proper cooling operation, Y wire from thermo-
stat MUST be connected to Y terminal on control center, as shown
in Fig. 27. The 24-v terminal board is marked for easy connection
of field wiring. (See Fig. 30.) The 24-v circuit contains a 3-amp,
automotive-type fuse located on control center. (See Fig. 31.) Any
electrical shorts of 24-v wiring during installation, service, or
maintenance may cause fuse to blow. If fuse replacement is
required, use only a fuse of identical size (3 amp).
NOTE: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
Fig. 26—Typical Gas Pipe Arrangement
A93324
UNION
SEDIMENT
TRAP
MANUAL
SHUTOFF
VALVE
(REQUIRED)
GAS
SUPPLY
19
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→

ACCESSORIES
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2 are
provided for EAC connection. (See Fig. 31.) These terminals
are energized with 115-v (1.0-amp maximum) during blower
motor operation.
DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat™, Zone Controller or
similar device. See Thermidistat™, Zone Controller, thermo-
stat, or controller manufacturer’s instructions for proper
connection. A failure to follow this warning could result in
fire.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (COM
24V) are provided for 24-v humidifier connection. (See Fig.
30.) HUM terminal is energized with 24-v (0.5-amp maxi-
mum) when gas valve is energized.
NOTE: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
Step 9—Direct Venting
The 58MXA furnaces require a dedicated (one 58MXA furnace
only) direct-vent system. In a direct-vent system, all air for
combustion is taken directly from outside atmosphere, and all flue
products are discharged to outside atmosphere.
REMOVAL OF EXISTING FURNACES FROM COMMON
VENT SYSTEMS
If furnace being replaced was connected to a common vent system
with other appliances, the original venting system may no longer
be sized to properly vent the attached appliance.
Fig. 27—Heating and Cooling Application Wiring Diagram
A99440
115-V FIELD-
SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-ONLY
FIVE WIRE
NOTE 1
NOTE 2 FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
COM
WCR GY
GND
GND
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
NOTES: ConnectY-terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
W
Y/Y2
GND
THERMOSTAT
TERMINALS
1.
2.
3.
Fig. 28—Disconnect Switch and Furnace
A93033
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
Fig. 29—Relocating J-Box
A00212
FACTORY
INSTALLED
LOCATION
ALTERNATE
FIELD
LOCATION
20
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