Carrier Furnace 58TMA User Manual

58TMA  
Downflow/Horizontal 2-Speed, 2-Stage,  
Induced-Combustion Gas Furnace  
Installation, Start-Up, and Operating Instructions  
Sizes 065-125, Series 111  
NOTE: Read the entire instruction manual before starting the  
installation.  
This symbol indicates a change since the last issue.  
ama  
Index  
Page  
SAFETY CONSIDERATIONS.....................................................1  
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS  
PROCEDURE...........................................................................2  
INTRODUCTION.......................................................................2-4  
Dimensional Drawing ....................................................................2  
Clearances to Combustibles......................................................3  
LOCATION....................................................................................4  
General ......................................................................................4  
Location Relative to Cooling Equipment ................................4  
Hazardous Locations.................................................................4  
AIR FOR COMBUSTION AND VENTILATION...................4-5  
Unconfined Space.....................................................................4  
Confined Space......................................................................4-5  
SUPPLY-AIR PLENUM INSTALLATION  
CANADIAN GAS ASSOCIATION  
®
A PPROVED  
R
CERTIFICATION OF  
MANUFACTURING SITE  
SAFETY CONSIDERATIONS  
(DOWNFLOW).....................................................................5-6  
Installation On Combustible Floor...........................................6  
HORIZONTAL ATTIC INSTALLATION...................................7  
HORIZONTAL CRAWLSPACE INSTALLATION....................7  
FILTER ARRANGEMENT...........................................................7  
GAS PIPING...............................................................................7-9  
ELECTRICAL CONNECTIONS ................................................10  
115-v Wiring...........................................................................10  
24-v Wiring.............................................................................10  
Accessories..............................................................................10  
VENTING ....................................................................................10  
START-UP, ADJUSTMENT, AND SAFETY CHECK.......10-22  
General...............................................................................10-12  
Sequence of Operation ......................................................12-16  
Adaptive Heating Mode ....................................................12-14  
Non-Adaptive Heating Mode .................................................14  
Cooling Mode....................................................................14-15  
Continuous Blower Mode.......................................................15  
Heat Pump Mode....................................................................15  
Defrost Mode.....................................................................15-16  
Start-Up Procedures................................................................16  
Adjustments .......................................................................16-22  
Set Gas Input Rate ............................................................16-22  
Set Temperature Rise ........................................................17-21  
Set Thermostat Heat Anticipator ......................................21-22  
Check Safety Controls............................................................22  
Checklist..................................................................................23  
Installing and servicing heating equipment can be hazardous due to  
gas and electrical components. Only trained and qualified person-  
nel 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 the literature, on tags,  
and on labels attached to or shipped with the unit and other safety  
precautions that may apply.  
Follow all safety codes. In the United States, refer to the National  
Fuel Gas Code (NFGC) NFPA No. 54-1996/ANSI Z223.1-1996.  
In Canada, refer to the current edition of the National Standard of  
Canada CAN/CGA-B149.1- and .2-M95 Natural Gas and Propane  
Installation Codes (NSCNGPIC). Wear safety glasses and work  
gloves. Have 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 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 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.  
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.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 6a 8a  
1
4
PC 101  
Catalog No. 535-887  
Printed in U.S.A.  
Form 58TMA-6SI  
Pg 1  
8-97  
Replaces: 58TMA-4SI  
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MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION  
This forced air furnace is equipped for use with natural gas at  
altitudes 0-10,000 ft (0-3,050m).  
Clearance arrows do not change with furnace orientation.  
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.  
1"  
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 from combustible material.  
This furnace may be used with a Type B-1 Vent and may be vented  
in common with other gas-fired appliances.  
0"  
1"  
††  
#
B
A
*
C
K
For installation on non-combustible floors only.  
S
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.  
E
R
V
I
C
F
R
O
E 30"  
N
For furnaces wider than 14.25 inches (362mm) may be 0 inches.  
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.  
For single wall vent type 6 inches.  
For Type B-1 vent type 3 inches.  
Clearance to Back 0 inches (0 po) in downflow and horizontal  
(attic/alcove & crawlspace) positions and 3 inches (3 po) in  
horizontal closet positions.  
MIN  
#
Ø
*
T
##  
1" #  
*
Ø
#
"
Clearance in inches.  
1
##  
††  
Vent Clearance to combustibles:  
For Single Wall vents 6 inches (6 po).  
For Type B-1 vent type 1 inch (1 po).  
A97430  
Fig. 2—Clearances to Combustibles  
in alcoves, attics, crawlspaces, basements, closets, or utility rooms.  
The design of this furnace line is not A.G.A./C.G.A. certified for  
installation in mobile homes, recreation vehicles, or outdoors.  
Application of this furnace should be indoors with special  
attention given to vent sizing and material, gas input rate, air  
temperature rise, and unit sizing. Improper installation or  
misapplication of the furnace can require excessive servicing  
or cause premature component failure.  
Before installing the furnace, refer to the current edition of the  
NFGC and the NFPA 90B. Canadian installations must be installed  
in accordance NSCNGPIC and all authorities having jurisdiction.  
For a copy of the NFGC NFPA54/Z223.1, contact International  
Approval Services U.S. Inc., 8501 E. Pleasant Valley Road,  
Cleveland, OH 44131 or National Fire Protection Association Inc.,  
Batterymarch Park, Quincy, MA 02269. For a copy of NFPA 90B,  
contact National Fire Protection Association Inc., Batterymarch  
Park, Quincy, MA 02269.  
Installation must conform to regulations of serving gas supplier  
and local building, heating, and plumbing codes in effect in the  
area in which installation is made, or in absence of local codes with  
requirements of the NFGC.  
This furnace is designed for a minimum continuous return-air  
temperature of 60°F db or intermittent operation down to 55°F  
such as when used with a night setback thermostat. Return-air  
temperature must not exceed 85°F db.  
Before installing the furnace in Canada, refer to the current edition  
of the NSCNGPIC. Contact Standards Department of Canadian  
Gas Association, 55 Scarsdale Road, Don Mills, Ontario, Canada  
M3B 2R3.  
To aid in installation, troubleshooting, and service, a status code  
label is located on blower component door. This label explains  
how to use the LED status indicated on furnace control which is  
viewed through the sight glass on door.  
The duct system should be designed and sized according to  
accepted national standards published by: Air Conditioning Con-  
tractors Association (ACCA), Sheet Metal and Air Conditioning  
Contractors National Association (SMACNA). Or consult the  
Residential Systems Design Guidelines reference tables available  
from your local distributor. The duct system should be sized to  
handle the maximum CFM capabilities of the equipment at the  
optimum design static pressure.  
3
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HAZARDOUS LOCATIONS  
When furnace is installed in a residential garage, it must be  
installed so that burners and ignition source are at least 18 in.  
above floor. The furnace should be protected from physical  
damage by vehicles.  
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, loss of life, or property damage.  
Consult a qualified installer, service agency, local gas sup-  
plier, or your distributor or branch for information or assis-  
tance. The qualified installer or agency must use only  
factory-authorized and listed kits or accessories when modi-  
fying this product. A failure to follow this warning could  
result in electrical shock, fire, personal injury, or death.  
When furnace is installed in public garages, airplane hangars, or  
other buildings having hazardous atmospheres, unit must be  
installed in accordance with recommended good practice require-  
ments of the National Fire Protection Association, Inc.  
Step 2—Air for Combustion and Ventilation  
Provisions for adequate combustion and ventilation air must be  
provided in accordance with Section 5.3, Air for Combustion and  
Ventilation, of the NFGC or applicable provisions of local building  
codes.  
For high-altitude installation, the high-altitude conversion kit must  
be installed at or above 5500 ft above sea level.  
For accessory installation details, refer to applicable installation  
literature.  
Canadian installations must be in accordance with NSCNGPIC  
and all authorities having jurisdiction.  
NOTE: Remove all shipping brackets and materials before oper-  
ating furnace.  
Step 1—Location  
Air for combustion must not be contaminated by halogen  
compounds which include fluoride, chloride, bromide, and  
iodide. These elements are found in aerosol sprays, deter-  
gents, bleaches, cleaning solvents, salts, air fresheners, and  
other household products.  
GENERAL  
DO NOT install furnace in a corrosive or contaminated  
atmosphere. Make sure all combustion and circulating air  
requirements are followed.  
DO NOT use this furnace during construction when adhe-  
sives, sealers, and/or new carpets are being installed and  
curing. If the furnace is required during construction, use  
clean outside air for combustion and ventilation. Compounds  
of chlorine and fluorine when burned in combustion air form  
acids which will cause corrosion of the heat exchangers and  
metal vent systems. Some of these compounds are released  
from paneling and dry wall adhesives, paints, thinners,  
masonry cleaning materials, and many other solvents com-  
monly used in the construction process.  
The operation of exhaust fans, kitchen ventilation fans,  
clothes dryers, or fireplaces could create a negative air  
pressure condition at the furnace. Make-up air must be  
provided for these devices, in addition to that required by the  
furnace.  
All fuel-burning equipment must be supplied with air for combus-  
tion of the fuel. Sufficient air MUST be provided to ensure there  
will not be a negative pressure in equipment room or space. In  
addition, a positive seal MUST be made between furnace cabinet  
and return-air duct to avoid pulling air from the burner area and  
draft safeguard opening into circulating air.  
Excessive exposure to contaminated combustion air will  
result in safety and performance related problems.  
The requirements for combustion and ventilation air depend upon  
whether furnace is located in a CONFINED or UNCONFINED  
space.  
This furnace must be installed so electrical components are  
protected from water.  
Locate furnace as near to center of air distribution system and  
chimney or vent as possible. The furnace should be installed as  
level as possible.  
UNCONFINED SPACE  
An unconfined space must have at least 50 cu ft for each 1000  
Btuh of input for all appliances (such as furnaces, clothes dryer,  
water heaters, etc.) in the space.  
When furnace is installed so that supply ducts carry air to areas  
outside space containing furnace, the return air must also be  
handled by a duct(s) sealed to furnace casing and terminating  
outside space containing furnace.  
For Example:  
58TMA FURNACE  
HIGH-FIRE INPUT  
BTUH  
MINIMUM SQ FT  
WITH  
7-1/2 FT CEILING  
Provide ample space for servicing and cleaning. Always comply  
with minimum fire protection clearances shown on unit clearance  
label. This furnace shall not be installed directly on carpeting, tile,  
or any combustible material other than wood flooring. The furnace  
may be installed on combustible flooring when installed with  
accessory downflow subbase, which is available from your dis-  
tributor or branch when required.  
63,000  
84,000  
105,000  
123,000  
420  
560  
700  
820  
If space is constructed unusually tight, air for combustion and  
ventilation MUST come from either the outdoors or spaces freely  
communicating with outdoors. Combustion and ventilation open-  
ings must be sized the same as for a confined space as defined  
below. Return air must not be taken from the room unless equal or  
greater amount of air is supplied to the room.  
LOCATION RELATIVE TO COOLING EQUIPMENT  
The cooling coil must be installed parallel with or on downstream  
side of furnace to avoid condensation in heat exchangers. When  
installed parallel with furnace, dampers or other means used to  
control the flow of air must prevent chilled air from entering  
furnace. If dampers are manually operated, they must be equipped  
with means to prevent operation of either unit unless damper is in  
full-heat or full-cooling position.  
CONFINED SPACE  
A confined space is defined as a space whose volume is less than  
50 cu ft per 1000 Btuh of total input ratings of all appliances  
4
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DUCTS TO  
OUTDOORS  
1 SQ IN.  
PER 4000  
BTUH  
*
VENT THROUGH ROOF  
(CATEGORY I)  
12MAX  
D
12″  
1 SQ IN.  
MAX  
RETURN  
AIR  
VENT  
A
PER 2000  
THROUGH  
ROOF  
(CATEGORY I)  
F
BTUH  
RETURN  
AIR  
*
12MAX  
1 SQ IN.  
PER 4000  
1 SQ IN.  
PER 1000  
BTUH  
*
DUCTS  
BTUH IN DOOR  
*
TO  
OR WALL  
OUTDOORS  
INTERIOR  
HEATED  
SPACE  
OUTSIDE  
UNCONFINED  
SPACE  
1 SQ IN.  
PER 4000  
6MIN  
BTUH  
*
(FRONT) †  
1 SQ IN.  
PER 2000  
BTUH  
1 SQ IN.  
G
E
B
PER 1000  
12″  
*
BTUH IN DOOR  
*
MAX  
C
12MAX  
OR WALL  
12MAX  
12MAX  
SUPPLY AIR  
DUCT  
TO  
OUTDOORS  
1 SQ IN.  
PER 4000  
BTUH  
SUPPLY AIR  
Minimum dimensions of 3 in.  
*
* Minimum opening size is 100 sq in. with  
minimum dimensions of 3 in.  
Minimum of 3 in. when type B-1 vent is used.  
NOTE: Use any of the following  
combinations of openings:  
A & B C & D D & E F & G  
A93387  
A93388  
Fig. 3—Confined Space: Air for Combustion and Fig. 4—Confined Space: Air for Combustion and  
Ventilation from an Unconfined Space  
Ventilation from Outdoors  
installed in that space. A confined space MUST have provisions  
for supplying air for combustion, ventilation, and dilution of flue  
gases using 1 of the following methods. (See Fig. 3 and Table 2.)  
2. Air from outside the structure requires 1 of the following  
methods:  
a. If combustion air is taken from outdoors through 2 vertical  
ducts, the openings and ducts MUST have at least 1 sq in.  
of free area per 4000 Btuh of total input for all equipment  
within the confined space. (See Fig. 4 and Table 2.)  
NOTE: In determining free area of an opening, the blocking  
effect of louvers, grilles, and screens must be considered. If free  
area of louver or grille design is unknown, assume that wood  
louvers have a 20 percent free area and metal louvers or grilles  
have a 60 percent free area. Screens, when used, must not be  
smaller than 1/4-in. mesh. Louvers and grilles must be constructed  
so they cannot be closed.  
b. If combustion air is taken from outdoors through 2 hori-  
zontal ducts, the openings and ducts MUST have at least 1  
sq in. of free area per 2000 Btuh of total input for all  
equipment within the confined space. (See Fig. 4 and Table  
2.)  
The size of the openings depends upon whether air comes from  
outside of the structure or an unconfined space inside the structure.  
c. If combustion air is taken from outdoors through a single  
opening or duct (horizontal or vertical) commencing within  
12 in. of the top of the confined space, opening and duct  
MUST have at least 1 sq in. of free area per 3000 Btuh of  
the total input for all equipment within the confined space  
and not less than the sum of the areas of all vent connectors  
in the confined space. (See Fig. 4 and Table 2.) Equipment  
clearances to the structure shall be at least 1 in. from the  
sides and back and 6 in. from the front of the appliances.  
1. All air from inside the structure requires 2 openings (for  
structures not usually tight):  
a. Each opening MUST have at least 1 sq in. of free area per  
1000 Btuh of total input for all equipment within the  
confined space, but not less than 100 sq in. per opening.  
(See Fig. 3 and Table 2.) The minimum dimension of air  
openings shall not be less than 3 in.  
When ducts are used, they must be of the same cross-sectional area  
as the free area of the openings to which they connect. The  
minimum dimension of ducts must not be less than 3 in. (See Fig.  
4.)  
b. If the building is constructed unusually tight, a permanent  
opening directly communicating with the outdoors shall be  
provided. See item 2 below.  
c. If furnace is installed on a raised platform to provide a  
return-air plenum, and return air is taken directly from  
hallway or space adjacent to furnace, all air for combustion  
must come from outdoors.  
Step 3—Supply-Air Plenum Installation (Downflow)  
DOWNFLOW INSTALLATION  
NOTE: This furnace is approved for use on combustible flooring  
when manufacturer’s accessory floor base Part No.  
5
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Table 2—Free Area Of Combustion Air Opening  
AIR UNCONFINED  
SPACE FROM  
OUTDOOR AIR THROUGH  
VERTICAL DUCTS  
OUTDOOR AIR THROUGH  
HORIZONTAL DUCTS  
OUTDOOR AIR THROUGH  
SINGLE DUCT  
58TMA  
FURNACE  
HIGH-FIRE  
INPUT  
Free Area  
of Opening  
(Sq In.)  
Free Area of  
Opening and Duct  
(Sq In.)  
Round  
Pipe  
(In. Dia)  
Free Area of  
Opening and Duct  
(Sq In.)  
Round  
Pipe  
(In. Dia)  
Free Area of  
Opening and Duct  
(Sq In.)  
Round  
Pipe  
(In. Dia)  
(BTUH)  
63,000  
84,000  
105,000  
123,000  
100  
100  
105  
123  
15.8  
21.0  
26.3  
30.8  
5
6
6
7
31.5  
42.0  
52.5  
61.5  
7
8
9
9
21.0  
28.0  
35.0  
41.0  
6
6
7
8
KGASB0201ALL is used. Manufacturer’s accessory floor 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.  
4. If downflow subbase (KGASB) is used, install as shown in  
Fig. 6.  
If coil assembly CD5, CK5, or Coil Box KCAKC is used,  
install as shown in Fig. 7.  
1. Determine application being installed from Table 3.  
INSTALLATION ON COMBUSTIBLE FLOOR  
1. Cut and frame hole in floor per dimensions in Installation  
Instructions packaged with downflow subbase.  
2. Construct hole in floor per dimensions specified in Table 3  
and Fig. 5.  
3. Construct plenum to dimensions specified in Table 3.  
A
PLENUM  
OPENING  
B
D
FLOOR  
OPENING  
C
A96283  
Fig. 5—Floor and Plenum Opening Dimensions  
Table 3—Opening Dimensions (In.)  
FURNACE  
CASING  
WIDTH  
PLENUM OPENING  
APPLICATION  
FLOOR OPENING  
A
B
C
D
Non-Combustible Flooring  
Combustible Flooring Using KGASB Subbase  
12-11/16  
11-13/16  
19  
19  
13-3/8  
13-7/16  
19-5/8  
20-3/8  
14-3/16  
17-1/2  
21  
Combustible Flooring with CD5 or CK5 Coil Assembly or  
KCAKC Coil Box  
Non-Combustible Flooring  
Combustible Flooring Using KGASB Subbase  
Combustible Flooring with CD5 or CK5 Coil Assembly or  
KCAKC Coil Box  
Non-Combustible Flooring  
Combustible Flooring Using KGASB Subbase  
Combustible Flooring with CD5 or CK5 Coil Assembly or  
KCAKC Coil Box  
12-5/16  
19  
13-5/16  
20  
16  
15-1/8  
19  
19  
16-5/8  
16-3/4  
19-5/8  
20-3/8  
15-1/2  
19  
16-1/2  
20  
19-1/2  
18-5/8  
19  
19  
20-1/8  
20-1/4  
19-5/8  
20-3/8  
19  
19  
20  
20  
Non-Combustible Flooring  
Combustible Flooring Using KGASB Subbase  
23  
22-1/8  
19  
19  
23-5/8  
23-3/4  
19-5/8  
20-3/8  
24-1/2  
Combustible Flooring with CD5 or CK5 Coil Assembly or  
KCAKC Coil Box  
22-1/2  
19  
23-1/2  
20  
6
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FURNACE  
(OR COIL CASING  
WHEN USED)  
FURNACE  
CD5 OR CK5  
COIL ASSEMBLY  
OR KCAKC  
COIL BOX  
COMBUSTIBLE  
FLOORING  
COMBUSTIBLE  
FLOORING  
DOWNFLOW  
SUBBASE  
SHEET METAL  
PLENUM  
SHEET METAL  
PLENUM  
FLOOR  
OPENING  
FLOOR  
OPENING  
A96285  
A96284  
Fig. 6—Furnace, Plenum, and Subbase Installed on Fig. 7—Furnace, Plenum, and Coil Assembly or Coil  
Combustible Floor  
Box Installed on Combustible Floor  
2. When completed, downflow subbase, plenum, and furnace (or  
coil casing when used) should be installed as shown in Fig. 6.  
10.) The furnace can be suspended from each corner by hanger  
bolts (4 each 3/8-in. all-thread rod) cut to desired length, 1- X  
3/8-in. flat washer, 3/8-in. lockwasher, and 3/8-in. nut. Dimples  
are provided for hole locations. (See Fig. 1.)  
Step 4—Horizontal Attic Installation  
Since horizontal crawlspace installation is very similar to attic  
installation, refer to Step 4. The installation of a sheet metal shield  
in front of louvered control panel is covered in Step 4. For a  
crawlspace installation, this same sheet metal shield must be  
installed above louvered control panel. Extend sheet metal shield  
over furnace top far enough to cover gas pipe entry hole.  
Do not install furnace on its back; safety control operation  
will be adversely affected. Never connect return-air ducts to  
the sides or back of the furnace. A failure to follow this  
warning could result in fire, personal injury, or death.  
The furnace can be installed horizontally on either the left-hand  
(LH) or right-hand (RH) side. A typical attic installation is shown  
in Fig. 8.  
Step 6—Filter Arrangement  
CONSTRUCT WORKING PLATFORM  
Construct working platform on location where all required furnace  
clearances are met. (See Table 1 and Fig. 8.)  
Never operate unit without a filter or with filter access door  
removed. A failure to follow this warning could result in fire,  
personal injury, or death.  
INSTALL FURNACE  
1. Position furnace in desired location.  
2. Connect gas supply pipe. See Fig. 8 for typical piping entry.  
3. Connect supply- and return-air ducts.  
The 2 factory-supplied filters are shipped in the blower compart-  
ment. After return-air duct has been connected to furnace, install  
filters in a V-formation inside return-air plenum. See Fig. 11 and  
Table 4 for horizontal applications. Horizontal filter retainers must  
be field supplied. See Fig. 12 for downflow applications.  
4. Install field-supplied filter retainers as indicated in Fig. 11 and  
Table 4 before connecting return-air duct to furnace.  
Step 7—Gas Piping  
5. Install 24- X 24-in. sheet metal shield on platform in front of  
louvered control panel as shown in Fig. 8.  
Gas piping must be installed in accordance with national and local  
codes. Refer to the NFGC NFPA 54-1996/ANSI Z223.1-1996.  
Canadian installations must be installed in accordance with NSC-  
NGPIC and all authorities having jurisdiction.  
Step 5—Horizontal Crawlspace Installation  
The gas supply line should be a separate line directly from the  
meter to the furnace, if possible. Refer to Table 5 for recom-  
mended gas pipe sizing. Risers should be used to connect to the  
furnace and to the meter.  
The furnace can be installed horizontally with either the LH or RH  
side up. In a crawlspace, furnace can either be hung from floor  
joist (see Fig. 9) or installed on suitable blocks or pad. (See Fig.  
7
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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.  
GAS  
ENTRY  
TYPE-B  
VENT  
MIN  
6
30-IN. MIN  
WORK AREA  
24  
SHEET  
METAL  
24  
MANUAL SHUTOFF  
GAS VALVE  
SEDIMENT  
TRAP  
A97516  
Fig. 8—Typical Attic Installation  
38-IN. ROD  
ANGLE  
IRON OR  
EQUIVALENT  
(B)  
(A)  
(B)  
(A)  
(B)  
(A) ROD LOCATION  
USING DIMPLE  
LOCATORS  
(A)  
(B)  
3/8-IN. HEX NUT  
& WASHER (4)  
REQD PER ROD  
(SEE DIMENSIONAL  
DWG FOR  
LOCATIONS)  
NOTES: 1. A 1 In. clearance minimum between top of  
furnace and combustible material.  
(A) PREFERRED ROD LOCATION  
(B) ALTERNATE ROD LOCATION  
2. The entire length of furnace must be  
supported when furnace is used in horizontal  
position.  
A96633  
Fig. 9—Horizontal Crawlspace Installation on Hanger Rods  
8
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AIRFLOW  
INSTALLATION  
POSITION  
OF FILTERS  
RETURN-AIR  
PLENUM  
A95235  
Fig. 10—Horizontal Installation on Blocks  
AIRFLOW  
12″  
D
4″  
ACCESS DOOR  
FIELD-SUPPLIED  
FILTER RETAINERS  
A82173  
A88486  
Fig. 12—Downflow Filter Arrangement  
Table 5—Maximum Capacity of Pipe*  
Fig. 11—Horizontal Filter Arrangement  
Table 4—Filter Retainer (In.)  
FURNACE CASING WIDTH  
FILTERS  
D
14-3/8  
13-3/8  
11-5/8  
10-1/4  
NOMINAL  
INTERNAL  
LENGTH OF PIPE (FT)  
14-3/16  
17-1/2  
21  
(2) 14 X 20 X 1  
(2) 14 X 20 X 1  
(2) 16 X 20 X 1  
(2) 16 X 20 X 1  
IRON PIPE DIAMETER  
10  
20  
30  
40  
82  
50  
73  
SIZE (IN.)  
(IN.)  
1/2  
3/4  
1
1-1/4  
1-1/2  
0.622  
0.824  
1.049  
1.380  
1.610  
175  
360  
680  
120  
250  
465  
950  
97  
200  
375  
770  
170 151  
320 285  
660 580  
24-1/2  
1400  
2100 1460 1180 990 900  
If 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.  
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a  
supply line pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas).  
Ref: Table 10-2, NFPA 54-1996.  
Install accessible manual shutoff valve upstream of furnace gas  
controls and within 72 in. of furnace. A 1/8-in. NPT plugged  
tapping is provided on gas value for test gage connection.  
Installation of additional 1/8-in. NPT plugged tapping, accessible  
for test gage connection, installed immediately upstream of gas  
supply connection to furnace and downstream of manual shutoff  
valve is not required. Place ground joint union between gas control  
manifold and manual shutoff.  
Use the proper length of pipes to avoid stress on gas control  
manifold. A failure to follow this warning could result in a  
gas leak causing fire, explosion, personal injury, or death.  
Install sediment trap in riser leading to furnace. The trap can be  
installed by connecting a tee to riser leading from furnace. Connect  
capped nipple into lower end of tee. The capped nipple should  
extend below level of gas controls. (See Fig. 13.)  
Use a backup wrench at furnace gas control when connecting  
gas pipe to furnace to avoid damaging gas controls or  
manifold.  
Piping should be pressure tested in accordance with local and  
national plumbing and gas codes before furnace has been attached.  
If test pressure exceeds 0.5 psig (14-in. wc), the 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 the gas valve before test.  
(See Fig. 13.) It is recommended that ground joint union be  
loosened before pressure testing.  
Never purge a line into a combustion chamber. Never use  
matches, candles, flame, or other sources of ignition to check  
for gas leakage. Use a soap-and-water solution to check for  
gas leaks. A failure to follow this warning could result in fire,  
explosion, personal injury, or death.  
Joint compounds (pipe dope) should be applied sparingly and only  
to male threads of joints. This pipe dope must be resistant to action  
of propane gas.  
After all connections have been made, purge lines and check for  
gas leakage with regulated gas supply pressure.  
9
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NOTE: Proper polarity must be maintained for 115-v wiring. If  
polarity is incorrect, the furnace control status LED will flash  
rapidly and prevent heating operation.  
The cabinet must have an uninterrupted or unbroken ground  
according to NEC ANSI/NFPA 70-1996 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.  
GAS  
SUPPLY  
24-V WIRING  
MANUAL  
SHUTOFF  
VALVE  
Refer to ESD Precautions Procedure before proceeding with 24-v  
connections.  
(REQUIRED)  
Make field 24-v connections at the 24-v terminal block. (See Fig.  
14.) Connect terminal Y/Y2 as shown in Fig. 15 or 16 for proper  
operation in cooling mode. Use AWG No. 18 color-coded, copper  
thermostat wire only.  
SEDIMENT  
TRAP  
UNION  
When furnace is installed in horizontal position with RH discharge  
air, 24-v wire connections can be made easier by removing the 2  
control box mounting screws and letting control box turn so that  
24-v screw terminals are visible. Be sure to reinstall control box  
after connections are made.  
Fig. 13—Typical Gas Pipe ArrangementA89414  
EAC - ELECTRONIC  
AIR CLEANER  
(115-VAC 1 AMP MAX)  
The 24-v circuit contains an automotive-type, 3-amp fuse located  
on main control. Any 24-v electrical shorts during installation,  
service, or maintenance could cause this fuse to blow. If fuse  
replacement is required, use ONLY a 3-amp fuse. The control will  
flash code 24 when fuse needs replacement.  
3-AMP  
7
4
1
8
9
6
3
5
FUSE  
2
LED -  
DIAGNOSTIC  
LIGHT  
10 11  
12  
9
ACCESSORIES  
7
4
1
8
5
2
6
1. Electronic air cleaner (EAC)  
TWIN / TEST  
TERMINAL  
3
MASTER SLAVE  
1
A terminal block (EAC-1 [hot] and EAC-2 [neutral]) is  
provided for EAC connection. (See Fig. 14.) The terminals are  
energized with 115v, 1-amp maximum during blower motor  
operation.  
HUM -  
HUMIDIFIER  
(24-VAC 0.5  
AMP MAX)  
2. Humidifier (HUM)  
24-VOLT  
THERMOSTAT  
TERMINALS  
Screw terminals (HUM-1 and COM) are provided for 24-v  
humidifier connection. The terminals are energized with 24v,  
0.5-amp maximum when the gas valve is energized.  
Step 9—VENTING  
1
2
3
4
O F F  
O N  
Refer to National or Local Installation Code such as; National Fuel  
Gas Code NFPA No. 54-1996/Z223.1-1996, or the Canadian  
Installation Code, CAN B149.1- and .2-M95, for proper vent  
sizing and installation requirements. Use enclosed Venting Tables  
for Category I Fan-Assisted Furnaces for quick, easy reference.  
The horizontal portion of the venting system shall maintain a  
minimum of 1/4-in. upward slope per linear ft, and it shall be  
rigidly supported every 5 ft or less with hangers or straps to ensure  
that there will be no movement after installation.  
FURNACE AND  
BLOWER OFF DELAY  
SETUP SWITCHES  
A93348  
Fig. 14—Control Center  
Step 8—Electrical Connections  
115-V WIRING  
Refer to unit rating plate or Table 6 for equipment electrical  
requirements. The control system requires an earth ground for  
proper operation.  
Step 10—Start-Up, Adjustment, and Safety Check  
GENERAL  
The furnace must have a 115-v power supply properly connected  
and grounded. Correct polarity must be maintained to enable gas  
heating operation.  
Do not connect aluminum wire between disconnect switch  
and furnace. Use only copper wire.  
The gas service pressure must not exceed 0.5 psig (14-in. wc), and  
be no less than 0.16 psig (4.5-in. wc).  
Make all electrical connections in accordance with the current  
edition of the National Electrical Code (NEC) ANSI/NFPA  
70-1996 and any local codes or ordinances that might apply. For  
Canadian installations, all electrical connections must be made in  
accordance with CSA C22.1 Canadian Electrical Code or authori-  
ties having jurisdiction.  
Thermostat wire connections at R and W/W1 are the minimum  
required for gas heating operation. W2 must be connected for  
2-stage heating thermostats. COM, Y/Y2, and G are required for  
cooling, heat pumps, and some clock thermostats. These must be  
made at 24-v terminal block on control. (See Fig. 14.)  
10  
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Table 6—Electrical Data  
OPERATING  
VOLTAGE RANGE  
VOLTS—  
HERTZ—  
PHASE  
MAX  
UNIT  
MIN  
WIRE  
GAGE  
MAX WIRE  
LENGTH  
FT‡  
MAX FUSE OR  
HACR-TYPE  
UNIT  
SIZE  
AMPS  
CKT BKR AMPS†  
Max*  
127  
127  
127  
127  
127  
127  
127  
Min*  
104  
104  
104  
104  
104  
104  
104  
065-08  
065-12  
085-12  
085-16  
105-16  
105-20  
125-20  
115—60—1  
115—60—1  
115—60—1  
115—60—1  
115-60-1  
8.0  
14  
14  
14  
14  
14  
12  
12  
46  
35  
30  
26  
29  
33  
32  
15  
15  
15  
15  
15  
20  
20  
10.5  
12.0  
14.2  
13.2  
17.2  
17.9  
115—60—1  
115—60—1  
* Permissible limits of the voltage range at which the unit will operate satisfactorily.  
† Time-delay fuse is recommended.  
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.  
FIELD 24-V WIRING  
FIELD 115-, 208/230-, 460-V WIRING  
FACTORY 24-V WIRING  
FACTORY 115-V WIRING  
1-STAGE THERMOSTAT TERMINALS  
W
Y
R
G
C
FIVE  
WIRE  
FIELD-SUPPLIED  
FUSED DISCONNECT  
TWO-WIRE  
HEATING-  
ONLY  
208/230- OR  
460-V  
THREE  
PHASE  
W2  
BLK  
BLK  
COM  
W/W1  
WHT  
WHT  
208/230-V  
SINGLE  
PHASE  
GND  
Y/Y2  
115-V FUSED  
DISCONNECT  
SWITCH  
JUNCTION  
BOX  
R
G
GND  
CONTROL  
CONDENSING  
UNIT  
(WHEN REQUIRED)  
BOX  
24-V  
TERMINAL  
BLOCK  
NOTES: 1. Connect Y-terminal as shown for proper operation.  
FURNACE  
2. Some thermostats require a "C" terminal connection as shown.  
3. If any of the original wire, as supplied, must be replaced,  
use same type or equivalent wire.  
A97443  
Fig. 15—Heating and Cooling Application Wiring Diagram With 1-Stage Thermostat and Condensing Unit  
This furnace can be installed with either single-stage heating or  
2-stage heating thermostat.  
Table 7—Setup Switch Description  
SETUP  
SWITCH NO.  
NORMAL  
POSITION  
For single-stage thermostats, connect thermostat W to W/W1 at  
furnace control terminal block. (See Fig. 15.) For single-stage  
thermostats the control determines, based on length of previous  
heating on and off cycles, when to operate in low- and high-gas  
heat for optimum comfort. Setup Switch-2 (SW-2) must be in the  
factory-shipped OFF position. See Fig. 17 and Tables 6 and 7 for  
setup switch information.  
DESCRIPTION OF USE  
Turn switch on to obtain only  
high-gas-heat operation on  
any call for heat regardless of  
whether R-W/W1, or R-W/W1,  
-W2 is closed. SW-1 overrides  
SW-2.  
OFF  
(Staged Gas  
Heat)  
SW-1  
Only High-Gas Heat  
Turn switch off for installations  
with single-stage thermostats;  
control selects low-gas-heat  
or high-gas-heat operation  
based on previous cycles.  
Turn switch on for installations  
with 2-stage thermostats to  
permit only low-gas-heat op-  
eration in response to closing  
R-W/W1. High-gas heat is  
supplied only when R to  
If 2-stage heating thermostat is to be used, move SW-2 to ON  
position at end of furnace installation. This overrides built-in  
control process for selecting high and low stage and allows 2-stage  
thermostat to select gas heating modes. The W2 from thermostat  
must be connected to W2 on control terminal block. (See Fig. 16.)  
SW-2  
Low-Gas Heat  
(Adaptive Mode)  
OFF  
(Single-Stage  
Thermostat)  
Before operating furnace, check each manual reset switch for  
continuity. If necessary, press and release button to reset switch.  
W/W1 and W2 is closed.  
Switches control gas heating  
blower off delay. (See Table  
8.)  
SW-3 and  
SW4  
ON, OFF  
11  
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FIELD 24-V WIRING  
FIELD 115-, 208/230-, 460-V WIRING  
FACTORY 24-V WIRING  
FACTORY 115-V WIRING  
2-STAGE THERMOSTAT TERMINALS  
W2 W1 Y2  
R
G
Y1  
C
SEVEN  
WIRE  
FIELD-SUPPLIED  
FUSED DISCONNECT  
THREE-WIRE  
HEATING-  
ONLY  
208/230- OR  
460-V  
THREE  
PHASE  
W2  
COM  
W/W1  
BLK  
BLK  
WHT  
WHT  
208/230-V  
SINGLE  
PHASE  
GND  
C
Y/Y2  
115-V FUSED  
DISCONNECT  
SWITCH  
JUNCTION  
BOX  
Y1  
Y2  
R
G
GND  
CONTROL  
2-SPEED  
CONDENSING  
UNIT  
(WHEN REQUIRED)  
BOX  
24-V  
TERMINAL  
BLOCK  
NOTES: 1. Connect Y-terminal as shown for proper operation.  
FURNACE  
2. Some thermostats require a "C" terminal connection as shown.  
3. If any of the original wire, as supplied, must be replaced,  
use same type or equivalent wire.  
A97444  
Fig. 16—Heating and Cooling Application Diagram With 2-Stage Thermostat and Condensing Unit  
Table 8—Blower Off Delay Setup Switch  
Position  
4
3
2
1
OFF  
ON  
DESIRED HEATING  
MODE BLOWER OFF  
DELAY (SEC)  
SETUP SWITCH  
SW-3  
SW-4  
90  
OFF  
OFF  
ON  
OFF  
ON  
135  
180  
225  
OFF  
ON  
ON  
his furnace is equipped with 2 manual reset limit switches in  
gas control area. The switches will open and shut off power  
to gas valve if a flame rollout or an overheating condition  
occurs in gas control area. DO NOT bypass switches. Correct  
inadequate combustion air supply, component failure, re-  
stricted flue gas passageway before resetting switches.  
LOW  
HEAT  
(ADAPTIVE  
ALGORITHM)  
BLOWER-  
HIGH  
HEAT  
ONLY  
OFF  
DELAY  
SEQUENCE OF OPERATION  
Using the schematic diagram follow sequence of operation through  
different modes. (See Fig. 18.) Read and follow wiring diagram  
very carefully.  
A96402  
Fig. 17—Setup Switches on Control Center  
(Factory Settings)  
NOTE: If power interruption occurs during "call for heat" (W/W1  
or W/W1-and-W2), control starts 90-sec blower only on period 2  
sec after power is restored if thermostat is still calling for gas  
heating. The red LED flashes code 12 during 90-sec period, after  
which LED will be on continuously as long as no faults are  
detected. After 90-sec period, furnace responds to thermostat  
normally.  
NOTE: With high-heat-only switch SW-1 off, low-heat-only  
switch SW-2 selects either low-heat-only operation mode when on  
(see item 2. below), or adaptive heating mode when off in response  
to "call for heat." (See Fig. 17.) When high-heat-only switch SW-1  
is on, it always causes high-gas-heat operation when R-W/W1  
circuit is closed, regardless of the setting of low-heat-only switch  
SW-2.  
Blower door must be installed for power to be conducted through  
blower door interlock switch ILK to furnace control CPU, trans-  
former TRAN, inducer motor IDM, blower motor BLWM, hot  
surface ignitor HSI, and gas valve GV.  
This furnace can operate as a 2-stage furnace with a single-  
stage thermostat because furnace control CPU includes a  
programmed adaptive sequence of controlled operation which  
selects low-gas-heat or high-gas-heat operation. This selection  
is based upon stored history of the length of previous gas  
heating on/off periods of single-stage thermostat.  
1. Adaptive Heating Mode—Single-Stage Thermostat and  
2-Stage Heating  
(See Fig. 16 for thermostat connections.)  
12  
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S W 2  
S W 3  
S W 4  
B L K  
W H  
B L U  
R E  
T
D
T
W H  
B L K  
B L K  
W H  
D
R E  
T
9
7
8
B L K  
Y
G R  
1
3
2
B L K  
1 2  
1 0 1 1  
Y
N
G R  
N
G R  
T
W H  
E
F S  
T
W H  
B R  
B L U  
)
S E U D H E W ( N  
# 8 T E N O  
2
3
1
L
Y E  
L
Y E  
N
O R  
N
O R  
N
R E  
O R  
N
O R  
D
D
R E  
S G N T T I S E  
Y R C T F O A  
F
O F  
O N  
F
F
O F  
O N  
F
F
O F  
O N  
3
4
2
1
O F  
O N  
O F  
O N  
D
R E  
13  
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The furnace starts up in either low- or high-gas heat. If furnace  
starts up in low-gas heat, control CPU determines low-gas  
heat on time (from 0 to 16 minutes) which is permitted before  
switching to high-gas heat.  
If power is interrupted, stored history is erased, and control  
CPU selects low-gas heat for up to 16 minutes and then  
switches to high-gas heat as long as thermostat continues to  
"call for heat." Subsequent selection is based on stored history  
of thermostat cycle times.  
inducer motor IDM provides sufficient pressure to close  
high-heat pressure switch HPS, high-heat gas valve sole-  
noid GV is energized. Blower motor BLWM switches  
speed for high-gas heat 5 sec after control CPU switches  
from low-gas heat to high-gas heat.  
g. Switching from high- to low-gas heat—Control CPU will  
not switch from high-gas heat to low-gas heat while  
thermostat R-W circuit is closed when a single-stage  
thermostat is used.  
When the wall thermostat "calls for heat," R-W1 circuit  
closes. The furnace control performs a self-check, verifies  
low-heat and high-heat pressure switch contacts LPS and HPS  
are open, and starts inducer motor IDM in low speed or high  
speed as appropriate.  
a. Inducer prepurge period—As inducer motor IDM comes up  
to low speed or high speed, the low-heat pressure switch  
contacts LPS (or LPS and HPS) close to begin a 15-sec  
prepurge period.  
h. Blower off delay—When thermostat is satisfied, R-W  
circuit is opened, de-energizing gas valve GV, stopping gas  
flow to burners, and de-energizing humidifier terminals  
HUM and COM. Inducer motor IDM remains energized for  
a 5-sec post-purge period. Blower motor BLWM and EAC  
terminals EAC-1 and EAC-2 remain energized for 90, 135,  
180, or 225 sec (depending on selection at blower off delay  
switches SW-3 and SW-4). Furnace control CPU is factory  
set for a 135-sec blower off delay.  
b. Ignitor warm-up—At the end of prepurge period, hot  
surface ignitor HSI is energized for a 17-sec ignitor  
warm-up period.  
2. Non-Adaptive Heating Mode—Two-Stage Thermostat and  
2-Stage Heating  
(See Fig. 16 for thermostat connections.)  
c. Trial-for-ignition sequence—When ignitor warm-up period  
is completed, main gas valve relay contacts MGVR-1 and  
-2 close to energize low-heat gas valve solenoid GV, gas  
valve opens, and 24-v power is supplied for a field-installed  
humidifier at terminals HUM and COM. Low-heat gas valve  
solenoid GV permits gas flow to the burners where it is  
ignited. After 5 sec, ignitor HSI is de-energized, and a 2-sec  
flame-proving period begins.  
NOTE: The low-heat-only switch SW-2 ON selects low-heat-  
only operation mode in response to closing thermostat R-W/W1  
circuit. When high-heat-only switch SW-1 is off, closing thermo-  
stat R to W1-and-W2 circuits is required for high-gas-heat  
operation. When high-heat-only switch SW-1 is on, it always  
causes high-gas-heat operation when R-W/W1 circuit is closed,  
regardless of setting of low-heat-only switch SW-2 and regardless  
of whether R-W2 circuit is closed or open.  
If furnace control CPU selects high-gas-heat operation,  
high-heat gas valve solenoid GV is also energized after  
normally closed high-heat pressure switch relay HPSR  
closes and after inducer motor IDM goes to high speed and  
provides sufficient pressure to close high-heat pressure  
switch HPS. HPSR is open while furnace is powered in  
standby mode. If high-heat pressure switch HPS fails to  
close and low-heat pressure switch LPS closes, furnace  
operates at low-heat gas flow rate until high-heat pressure  
switch closes.  
The start-up and shutdown functions and delays described in  
item 1 above apply to 2-stage heating mode as well, except for  
switching from low- to high-gas heat and vice versa.  
a. When wall thermostat "calls for heat," R-W/W1 circuit  
closes for low-gas heat or R to W1-and-W2 circuits close  
for high-gas heat. The furnace control performs a self-  
check, verifies low-heat and high-heat pressure switch  
contacts LPS and HPS are open, and starts inducer motor  
IDM in low speed or high speed as appropriate.  
b. Switching from low- to high-gas heat—If thermostat  
R-W/W1 circuit for low-gas heat is closed and R-W2  
circuit for high-gas heat closes, control CPU switches  
inducer motor IDM speed from low to high. The high-heat  
pressure switch relay HPSR closes. When inducer motor  
IDM provides sufficient pressure to close high-heat pres-  
sure switch HPS, high-heat gas valve solenoid GV is  
energized. Blower motor BLWM switches speed for high-  
gas heat 5 sec after R-W2 circuit closes.  
d. Flame-proving—When burner flame is proved at flame-  
proving sensor electrode FSE, control CPU begins blower  
on delay period and continues to hold gas valve GV open.  
If burner flame is not proved within 2 sec, control CPU  
closes gas valve GV, and control CPU repeats ignition  
sequence for up to 3 more trials-for-ignition before going  
to ignition lockout. LOCKOUT IS RESET AUTOMATI-  
CALLY after 3 hr, or by momentarily interrupting 115-v  
power to furnace, or by interrupting 24-v power at SEC1 or  
SEC2 to control CPU (not at W/W1, G, R, etc.). Opening  
thermostat R-W circuit will not reset ignition lockout.  
c. Switching from high- to low-gas heat—If thermostat R-W2  
circuit for high-gas heat opens and R-W/W1 circuit for  
low-gas heat remains closed, control CPU switches inducer  
motor IDM speed from high to low. The high-heat pressure  
switch relay HPSR opens to de-energize high-heat gas  
valve solenoid GV. When inducer motor IDM reduces  
pressure sufficiently, high-heat pressure switch HPS opens.  
The low-heat gas valve solenoid GV remains energized as  
long as low-heat pressure switch LPS remains closed.  
Blower motor BLWM switches speed for low-gas heat 5  
sec after R-W2 circuit opens.  
If flame is proved when flame should not be present,  
control CPU locks out of gas heating mode and operates  
inducer motor IDM on high speed until flame is no longer  
proved.  
e. Blower on delay—If burner flame is proven, 45 sec after  
gas valve GV is opened blower motor BLWM is energized  
on appropriate heating speed, low-gas-heat or high-gas-  
heat speed. Simultaneously, EAC terminals EAC-1 and  
EAC-2 are energized with 115v and remain energized as  
long as blower motor BLWM is energized.  
3. Cooling Mode  
a. Single-Speed Cooling Outdoor Unit  
(See Fig. 15 for thermostat connections.)  
f. Switching from low- to high-gas heat—If furnace control  
CPU switches from low-gas heat to high-gas heat, control  
CPU switches inducer motor IDM speed from low to high.  
The high-heat pressure switch relay HPSR closes. When  
14  
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(1.) The thermostat closes R to G-and-Y circuits. The  
R-Y circuit starts outdoor unit, and R to G-and-Y  
circuits start furnace blower motor BLWM on high-  
cool speed.  
NOTE: An accessory interface kit is required with single-speed  
heat pumps. See interface kit Installation Instructions for single-  
speed heat pump thermostat and interface connections. No inter-  
face kit is needed for 2-speed heat pumps. See 2-speed heat pump  
Installation Instructions for thermostat connections.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating.  
a. Single-Speed Heat Pump Cooling  
(1.) The thermostat and interface kit close R to G-and-  
Y/Y2 circuit to start furnace blower motor BLWM on  
high-cooling speed. (Y/Y2 input to furnace control is  
necessary to provide adequate cooling airflow.)  
(3.) When thermostat is satisfied, R to G-and-Y circuits  
are opened. The outdoor unit stops, and furnace  
blower motor BLWM continues operating on high-  
cool speed for an additional 90 sec.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating.  
b. Two-Speed Cooling Outdoor Unit  
(See Fig. 16 for thermostat connections.)  
(3.) When thermostat is satisfied, furnace blower motor  
BLWM continues operating on high-cooling speed for  
an additional 90 sec.  
(1.) The thermostat closes R to G-and-Y1 circuits for low  
cooling or closes R to G-and-Y1-and-Y/Y2 circuits  
for high cooling. The R-Y1 circuits start outdoor unit  
on low-cooling speed, and R-G circuit starts furnace  
blower motor BLWM on low-cooling speed (same  
speed as for low-gas heat). The R to Y1-and-Y2  
circuits start outdoor unit on high-cooling speed, and  
R to G-and-Y2 circuits start furnace blower motor  
BLWM on high-cooling speed.  
b. Two-Speed Heat Pump Cooling  
(1.) The thermostat R to G circuits start furnace blower  
motor BLWM on low-cooling speed. Thermostat  
R to G-and-Y/Y2 circuits start furnace blower motor  
BLWM on high-cool speed.  
NOTE: The furnace control CPU controls blower motor BLWM  
speed by sensing only G (for low-cooling speed) and Y2 (for  
high-cooling speed).  
NOTE: Y1 is not located on furnace control, but is found in  
outdoor unit. The furnace control CPU controls blower motor  
BLWM speed by sensing only G for low-cooling speed and Y/Y2  
for high-cooling speed.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating on  
either cooling speed.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating on  
either cooling speed.  
(3.) When thermostat is satisfied, furnace blower motor  
BLWM continues operating on cooling speed for an  
additional 90 sec.  
(3.) When thermostat is satisfied, R to G-and-Y1 or  
R to G-and-Y1-and-Y/Y2 circuits open. The outdoor  
unit stops, and furnace blower continues operating on  
cooling speed for an additional 90 sec.  
c. Single-Speed Heat Pump Heating  
(1.) The thermostat and accessory interface kit R to G-  
and-Y/Y2 circuits start furnace blower motor BLWM  
on heat pump high-heat speed (identical to high-cool  
speed).  
4. Continuous Blower Mode  
a. When R to G circuit is closed by thermostat, blower motor  
BLWM operates on low-gas-heat speed (identical to low-  
cool speed). Terminals EAC-1 and EAC-2 are energized  
with 115v as long as blower motor BLWM is energized.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating.  
(3.) When thermostat is satisfied, furnace blower motor  
BLWM continues operating on heat pump high-heat  
speed for an additional 90 sec.  
b. During "call for heat," blower motor BLWM stops during  
ignitor warm-up (17 sec), ignition (7 sec), and blower on  
delay (45 sec), allowing furnace heat exchangers to heat up  
quickly.  
d. Two-Speed Heat Pump Heating  
(1.) The thermostat closes R to G circuit for low heat and  
starts furnace blower motor BLWM on heat pump  
low-heat speed (identical to low-cooling speed). Clos-  
ing R-Y/Y2 circuit to furnace provides blower motor  
BLWM heat pump high-heat speed.  
(1.) The blower motor BLWM reverts to continuous  
blower speed after heating cycle is completed. In  
high-gas-heat, furnace control CPU holds blower mo-  
tor BLWM at high-gas-heat speed during selected  
blower off delay period before reverting to continuous  
blower speed.  
NOTE: The furnace control CPU controls blower motor BLWM  
speed by sensing only G (for heat pump low-heat speed) and Y2  
(for heat pump high-heat speed).  
(2.) When thermostat "calls for low cooling," blower  
motor BLWM continues to operate on low-cool speed.  
When thermostat is satisfied, blower motor BLWM  
continues on continuous blower speed.  
(2.) The EAC terminals EAC-1 and EAC-2 are energized  
with 115v when blower motor BLWM is operating on  
either heating speed.  
(3.) When thermostat is satisfied, R to G or R to G-and-  
Y2 circuits are opened. After opening R to G-and-Y2  
circuit, the furnace blower motor BLWM continues  
operating on heating speed for an additional 90 sec.  
(3.) When thermostat "calls for high cooling," blower  
motor BLWM operates on high-cool speed. When  
thermostat is satisfied, blower motor BLWM operates  
an additional 2 sec on high-cool speed before reverting  
back to continuous blower speed.  
(4.) Opening R-Y2 circuit reduces blower motor BLWM  
speed to heat pump low-heat speed.  
(4.) When R to G circuit is opened, blower motor BLWM  
continues operating for an additional 90 sec if no other  
function requires blower motor BLWM operation.  
6. Defrost  
a. When furnace control R to W/W1-and-Y/Y2 circuits are  
closed, furnace control CPU continues blower motor  
5. Heat Pump  
15  
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BLWM operation at heat pump heating speed until end of  
prepurge period, then shuts off until end of HSI ignitor on  
period (22 sec).  
In the U.S.A., input rating for altitudes above 2000 ft must be  
reduced by 4 percent for each 1000 ft above sea level.  
In Canada, input rating must be derated by 10 percent for  
altitudes of 2000 ft to 4500 ft above sea level.  
b. When installed with a heat pump, furnace control CPU  
automatically holds blower off time to 22 sec during HSI  
ignitor on period. After 17 sec of HSI ignitor on period, a  
trial-for-ignition sequence occurs as described above for  
gas heating. After flame is proved and without blower on  
delay, blower motor BLWM then operates on high-gas-  
heat speed during defrost. For both single-speed and  
2-speed heat pumps, defrost mode is in high-gas heat only.  
Furnace input rate must be within 2 percent of input on  
furnace rating plate.  
2. Determine natural gas orifice size and manifold pressure for  
correct input.  
a. Obtain yearly heat value average (at installed altitude) from  
local gas supplier.  
b. Obtain yearly specific gravity average from local gas  
supplier.  
c. When furnace control R to W/W1 circuit is opened, furnace  
control CPU begins normal inducer post-purge period, and  
blower motor BLWM remains on for blower off delay  
period. If R-G circuit remains closed, blower motor  
BLWM reverts to continuous operation.  
c. Verify furnace model. Table 10 can only be used for model  
58TMA Furnaces.  
d. Find installation altitude in Table 10.  
START-UP PROCEDURES  
NOTE: For Canada altitudes of 2000 to 4500 ft, use U.S.A.  
1. Component test—The furnace features a component test  
system to help diagnose a system problem in case of compo-  
nent failure. To initiate component test procedure, ensure that  
there are no thermostat inputs to control and that all time  
delays have expired. Short TWIN/TEST terminal to ground or  
COM for 1 to 4 sec. See Fig. 14 for terminal locations.  
altitudes of 2001 to 3000 ft in Table 10.  
e. Find closest natural gas heat value and specific gravity in  
Table 10.  
f. Follow heat value and specific gravity lines to point of  
intersection to find orifice size and low- and high-heat  
manifold pressure settings for proper operation.  
NOTE: The component test feature will not operate if control is  
receiving any thermostat signals and until all time delays have  
expired.  
EXAMPLE: (0—2000 ft altitude)  
Heating value = 1075 Btu/cu ft  
Specific gravity = 0.62  
Therefore: Orifice No. 45  
Manifold pressure: 3.7-in. wc for high heat  
1.5-in. wc for low heat  
* Furnace is shipped with No. 45 orifices. In this example,  
all main burner orifices are the correct size and do not need  
to be changed to obtain proper input rate.  
The component test sequence is as follows:  
a. The furnace control checks itself, operates inducer motor  
on low speed for 7 sec and on high speed for 7 sec, then  
stops.  
b. The hot surface ignitor is then energized for 15 sec, then  
de-energized.  
c. The blower motor operates on low-gas-heat/heat pump  
low-heat/low-cool/continuous fan speed for 7 sec, then  
stops.  
g. Check and verify burner orifice size in furnace. NEVER  
ASSUME ORIFICE SIZE; ALWAYS CHECK AND  
VERIFY.  
d. The blower motor operates on high-gas-heat speed for 7  
sec, then stops. The gas valve and humidifier terminal  
HUM are not energized for safety reasons.  
3. Adjust manifold pressure to obtain input rate.  
NOTE: The EAC terminals are energized when blower is ener-  
gized.  
a. Remove caps that conceal adjustment screws for low- and  
high-heat gas valve regulators. (See Fig. 19.)  
e. The blower operates on heat pump high-heat/high-cool  
speed for 7 sec, then stops.  
b. Move setup switch SW-2 on control center to ON position.  
(See Fig. 17.) This keeps furnace locked in low-heat  
operation.  
2. After all connections have been made, purge gas lines and  
check for leaks.  
c. Jumper R and W/W1 thermostat connections on control  
center to start furnace.  
d. Turn low-heat adjusting screw (5/64 hex Allen wrench)  
counterclockwise (out) to decrease input rate or clockwise  
(in) to increase input rate.  
Never purge a line into a combustion chamber. Never use  
matches, candles, flame, or other sources of ignition to check  
for gas leakage. Use a soap-and-water solution to check for  
gas leaks. A failure to follow this warning could result in fire,  
explosion, personal injury, or death.  
NOTE: DO NOT set low-heat manifold pressure less than 1.3-in.  
wc or more than 1.7-in. wc for natural gas. If manifold pressure is  
outside this range, change main burner orifices.  
3. To operate furnace, follow procedures on operating instruction  
label attached to furnace.  
4. With furnace operating, set thermostat below room tempera-  
ture and observe that furnace goes off. Set thermostat above  
room temperature and observe that furnace restarts.  
DO NOT bottom out gas valve regulator adjusting screw.  
This can result in unregulated manifold pressure and result in  
excess overfire and heat exchanger failures.  
ADJUSTMENTS  
NOTE: If orifice hole appears damaged or it is suspected to have  
been redrilled, check orifice hole with a numbered drill bit of  
correct size. Never redrill an orifice. A burr-free and squarely  
aligned orifice hole is essential for proper flame characteristics.  
1. Set gas input rate.  
Furnace gas input rate on rating plate is for installations at  
altitudes up to 2000 ft.  
16  
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EXAMPLE:  
85,000 Btuh input furnace installed at 4300 ft.  
Furnace Input  
Rate at  
Sea Level  
Derate  
X Multiplier =  
Factor  
Furnace Input Rate  
at Installation  
Altitude  
85,000  
X
0.82  
=
69,700  
CANADA  
At installation altitudes from 2000 to 4500 ft, this furnace  
must be derated 10 percent by an authorized Gas Conver-  
sion Station or Dealer. To determine correct input rate for  
altitude, see example above and use 0.82 as derate multi-  
plier factor.  
BURNER  
ORIFICE  
b. Check that gas valve adjustment caps are in place for  
proper input to be clocked.  
A93059  
c. Obtain yearly heat value average for local gas supply.  
NOTE: Be sure heating value of gas used for calculations is  
correct for your altitude. Consult local gas utility for altitude  
adjustment of gas heating value.  
DO NOT redrill orifices. Improper drilling (burrs, out-of-  
round holes, etc.) can cause excessive burner noise and  
misdirection of burner flames. This can result in flame  
impingement of burners and heat exchangers, causing  
failures.  
d. Check and verify orifice size in furnace. NEVER AS-  
SUME THE ORIFICE SIZE. ALWAYS CHECK AND  
VERIFY.  
e. Turn off all other gas appliances and pilots.  
e. Move setup switch SW-2 to OFF position after completing  
low-heat adjustment.  
f. Move setup switch SW-2 to ON position. (See Fig. 17.)  
This keeps furnace locked in low-heat operation.  
g. Jumper R to W/W1.  
f. Jumper R and W2 thermostat connections on control center.  
(See Fig. 14.) This keeps furnace locked in high-heat  
operation.  
h. Let furnace run for 3 minutes in low-heat operation.  
i. Measure time (in sec) for gas meter to complete 1 revolu-  
tion. Note reading.  
g. Turn high-heat adjusting screw (5/64 hex Allen wrench)  
counterclockwise (out) to decrease input rate or clockwise  
(in) to increase rate.  
j. Refer to Table 10 for cubic ft of gas per hr.  
k. Multiply gas rate cu ft/hr by heating value (Btu/cu ft).  
NOTE: DO NOT set high-heat manifold pressure less than 3.2-in.  
wc or more than 3.8-in. wc for natural gas. If manifold pressure is  
outside this range, change main burner orifices.  
l. Move setup switch SW-2 to OFF position and jumper R and  
W2 thermostat connections. (See Fig. 17.) This keeps  
furnace locked in high-heat operation. Repeat items h  
through k for high-heat operation.  
h. When correct input is obtained, replace caps that conceal  
gas valve regulator adjustment screws. Main burner flame  
should be clear blue, almost transparent. (See Fig. 20.)  
EXAMPLE: (High-heat operation at 0—2000 ft altitude)  
Furnace input from rating plate is 85,000 Btuh  
Btu heating input = Btu/cu ft X cu ft/hr  
Heating value of gas = 1050 Btu/cu ft  
Time for 1 revolution of 2-cu ft dial = 92 sec  
Gas rate = 80 cu ft/hr (from Table 10)  
i. Remove jumper R to W2.  
4. Verify natural gas input rate by clocking gas meter.  
a. Calculate high-altitude adjustment (if required).  
UNITED STATES  
Btu heating input = 80 X 1050 = 84,000 Btuh In this  
example, the orifice size and manifold pressure adjustment  
is within 2 percent of the furnace input rate.  
At altitudes above 2000 ft, this furnace has been approved  
for a 4 percent derate for each 1000 ft above sea level. See  
Table 9 for derate multiplier factor and example.  
Table 9—Altitude Derate Multiplier for U.S.A.  
NOTE: Measured gas inputs (high heat and low heat) must be  
within 2 percent of that stated on furnace rating plate when  
installed at sea level or derated per that stated above when installed  
at higher altitudes.  
ALTITUDE  
(FT)  
% OF  
DERATE  
DERATE MULTIPLIER  
FACTOR FOR U.S.A.*  
0—2000  
2001—3000  
3001—4000  
4001—5000  
5001—6000  
6001—7000  
7001—8000  
8001—9000  
9001—10,000  
0
1.00  
0.90  
0.86  
0.82  
0.78  
0.74  
0.70  
0.66  
0.62  
8—12  
m. Remove jumper across R, W/W1, and W2 thermostat  
connections to terminate call for heat.  
12—16  
16—20  
20—24  
24—28  
18—32  
32—36  
36—40  
5. Set temperature rise.  
Place SW-2 in ON position. Jumper R to W/W1 and W2 to  
check high-gas-heat temperature rise. To check low-gas-heat  
temperature rise, remove jumper to W2. Determine air tem-  
perature rise for both high and low heat using the following  
steps. DO NOT exceed temperature rise ranges specified on  
unit rating plate for high and low heat.  
* Derate multiplier factor is based on midpoint altitude for altitude range.  
17  
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Table 10—Model 58TMA Orifice Size and Manifold Pressure for Correct Input  
(Tabulated Data Based on 21,000 Btuh High Heat/13,500 Btuh Low Heat per Burner,  
Derated 4% for Each 1000 Ft Above Sea Level)*  
SPECIFIC GRAVITY OF NATURAL GAS  
AVG GAS  
ALTITUDE  
RANGE  
(FT)  
0.58  
Manifold  
0.60  
Manifold  
0.62  
Manifold  
0.64  
Manifold  
Pressure  
High/Low  
0.66  
Manifold  
Pressure  
High/Low  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
Pressure  
High/Low  
Pressure  
High/Low  
850  
875  
900  
925  
950  
42  
43  
43  
43  
44  
44  
44  
44  
45  
46  
46  
3.3/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.5  
3.3/1.4  
3.2/1.3  
3.7/1.5  
3.7/1.5  
3.5/1.5  
42  
42  
43  
43  
44  
44  
44  
44  
45  
46  
46  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.5/1.4  
3.3/1.4  
3.8/1.6  
3.8/1.6  
3.6/1.5  
42  
42  
42  
43  
43  
44  
44  
44  
44  
45  
46  
3.5/1.5  
3.3/1.4  
3.2/1.3  
3.6/1.5  
3.5/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.8/1.6  
42  
42  
42  
43  
43  
43  
44  
44  
44  
44  
45  
3.7/1.5  
3.5/1.4  
3.3/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
42  
42  
42  
42  
43  
43  
44  
44  
44  
44  
45  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.6/1.5  
3.5/1.4  
3.3/1.4  
3.8/1.6  
0
to  
975  
1000  
1025  
1050  
1075  
1100  
2000  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
U.S.A.  
Altitudes  
2001  
to  
3000  
775  
800  
825  
850  
875  
900  
925  
950  
975  
1000  
1025  
43  
43  
44  
44  
44  
44  
46  
46  
46  
47  
47  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.5  
42  
43  
43  
44  
44  
44  
45  
46  
46  
47  
47  
3.2/1.3  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
3.8/1.6  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
42  
43  
43  
44  
44  
44  
44  
45  
46  
46  
47  
3.3/1.4  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.7/1.5  
3.5/1.4  
3.8/1.6  
42  
42  
43  
43  
44  
44  
44  
45  
46  
46  
46  
3.4/1.4  
3.2/1.3  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
3.8/1.6  
3.8/1.6  
3.6/1.5  
3.4/1.4  
42  
42  
43  
43  
44  
44  
44  
44  
45  
46  
46  
3.5/1.4  
3.3/1.3  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.7/1.5  
3.5/1.5  
or  
Canada  
Altitudes  
2000  
to  
4500  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
750  
775  
800  
825  
850  
875  
900  
925  
950  
975  
1000  
43  
44  
44  
44  
45  
46  
46  
47  
47  
47  
48  
3.5/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.8/1.6  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
43  
43  
44  
44  
44  
45  
46  
46  
47  
47  
48  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
3.8/1.6  
43  
43  
44  
44  
44  
44  
46  
46  
46  
47  
47  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
42  
43  
43  
44  
44  
44  
45  
46  
46  
47  
47  
3.2/1.3  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.4/1.4  
3.3/1.3  
3.7/1.5  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
42  
43  
43  
44  
44  
44  
44  
46  
46  
46  
47  
3.3/1.4  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3001  
to  
4000  
* For 125-20 size only, input is 20,500 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.  
wc.  
18  
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Table 10—Model 58TMA Orifice Size and Manifold Pressure for Correct Input—Continued  
(TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER,  
DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL)*  
SPECIFIC GRAVITY OF NATURAL GAS  
AVG GAS  
ALTITUDE  
RANGE  
(FT)  
0.58  
Manifold  
0.60  
Manifold  
0.62  
Manifold  
0.64  
Manifold  
Pressure  
High/Low  
0.66  
Manifold  
Pressure  
High/Low  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
Pressure  
High/Low  
Pressure  
High/Low  
725  
750  
775  
800  
825  
850  
875  
900  
925  
950  
44  
44  
44  
45  
46  
46  
47  
47  
48  
48  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.7/1.5  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
43  
44  
44  
44  
46  
46  
46  
47  
47  
48  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.7/1.5  
43  
44  
44  
44  
45  
46  
46  
47  
47  
48  
3.5/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.8/1.6  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.8/1.6  
43  
43  
44  
44  
44  
46  
46  
46  
47  
47  
3.6/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
43  
43  
44  
44  
44  
45  
46  
46  
47  
47  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
3.3/1.4  
3.8/1.6  
3.7/1.5  
3.5/1.5  
3.8/1.6  
3.6/1.5  
4001  
to  
5000  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
700  
725  
750  
775  
800  
825  
850  
875  
900  
925  
950  
975  
1000  
44  
44  
45  
46  
46  
47  
47  
48  
48  
48  
49  
49  
49  
3.5/1.5  
3.3/1.4  
3.7/1.5  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
44  
44  
44  
46  
46  
47  
47  
48  
48  
48  
49  
49  
49  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.5/1.5  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
44  
44  
44  
45  
46  
46  
47  
47  
48  
48  
48  
49  
49  
3.8/1.6  
3.5/1.4  
3.3/1.4  
3.7/1.5  
3.7/1.5  
3.4/1.4  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
3.3/1.4  
3.7/1.5  
3.6/1.5  
43  
44  
44  
44  
46  
46  
47  
47  
47  
48  
48  
48  
49  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.6/1.5  
3.5/1.4  
3.3/1.4  
3.7/1.5  
43  
44  
44  
44  
45  
46  
46  
47  
47  
48  
48  
48  
49  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
3.7/1.5  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.8/1.6  
5001  
to  
6000  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
650  
675  
700  
725  
750  
775  
800  
825  
850  
875  
44  
44  
45  
46  
47  
47  
48  
48  
48  
49  
3.5/1.5  
3.3/1.4  
3.7/1.5  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.8/1.6  
44  
44  
44  
46  
46  
47  
47  
48  
48  
48  
3.7/1.5  
3.4/1.4  
3.2/1.3  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.3/1.4  
44  
44  
44  
45  
46  
47  
47  
48  
48  
48  
3.8/1.6  
3.5/1.4  
3.3/1.3  
3.7/1.5  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
43  
44  
44  
45  
46  
46  
47  
47  
48  
48  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.8/1.6  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
43  
44  
44  
44  
46  
46  
47  
47  
47  
48  
3.5/1.4  
3.7/1.5  
3.5/1.4  
3.2/1.3  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.4/1.4  
3.6/1.5  
6001  
to  
7000  
* For 125-20 size only, input is 20,500 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.  
wc.  
19  
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Table 10—Model 58TMA Orifice Size and Manifold Pressure for Correct Input—Continued  
(TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER,  
DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL)*  
SPECIFIC GRAVITY OF NATURAL GAS  
AVG GAS  
ALTITUDE  
RANGE  
(FT)  
0.58  
Manifold  
0.60  
Manifold  
0.62  
Manifold  
0.64  
Manifold  
Pressure  
High/Low  
0.66  
Manifold  
Pressure  
High/Low  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
Pressure  
High/Low  
Pressure  
High/Low  
625  
650  
675  
700  
725  
750  
775  
800  
825  
850  
44  
45  
46  
47  
47  
48  
48  
48  
49  
49  
3.3/1.4  
3.7/1.5  
3.6/1.5  
3.8/1.6  
3.5/1.5  
3.7/1.5  
3.5/1.5  
3.3/1.4  
3.6/1.5  
3.4/1.4  
44  
45  
46  
46  
47  
47  
48  
48  
49  
49  
3.4/1.4  
3.8/1.6  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.8/1.6  
3.5/1.5  
44  
44  
46  
46  
47  
47  
48  
48  
48  
49  
3.5/1.5  
3.3/1.3  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.5/1.5  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.7/1.5  
44  
44  
45  
46  
46  
47  
47  
48  
48  
49  
3.6/1.5  
3.4/1.4  
3.8/1.6  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.8/1.6  
44  
44  
44  
46  
46  
47  
47  
48  
48  
48  
3.7/1.5  
3.5/1.4  
3.2/1.3  
3.8/1.6  
3.5/1.5  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.5/1.5  
3.3/1.4  
7001  
to  
8000  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
600  
625  
650  
675  
700  
725  
750  
775  
800  
45  
46  
47  
47  
48  
48  
49  
49  
49  
3.7/1.5  
3.6/1.5  
3.8/1.6  
3.5/1.4  
3.7/1.5  
3.4/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
44  
46  
46  
47  
48  
48  
48  
49  
49  
3.2/1.3  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.3/1.4  
3.7/1.5  
3.4/1.4  
44  
46  
46  
47  
47  
48  
48  
49  
49  
3.3/1.4  
3.8/1.6  
3.5/1.5  
3.7/1.5  
3.5/1.4  
3.7/1.5  
3.4/1.4  
3.8/1.6  
3.5/1.5  
44  
45  
46  
47  
47  
48  
48  
48  
49  
3.4/1.4  
3.8/1.6  
3.7/1.5  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.7/1.5  
44  
44  
46  
46  
47  
47  
48  
48  
49  
3.5/1.4  
3.2/1.3  
3.8/1.6  
3.5/1.4  
3.7/1.5  
3.4/1.4  
3.7/1.5  
3.4/1.4  
3.8/1.6  
8001  
to  
9000  
SPECIFIC GRAVITY OF NATURAL GAS  
0.60 0.62 0.64  
Manifold  
AVG GAS  
HEAT VALUE  
AT ALTITUDE  
(BTU/CU FT)  
ALTITUDE  
RANGE  
(FT)  
0.58  
0.66  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Manifold  
Pressure  
High/Low  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Orifice  
No.  
Pressure  
High/Low  
575  
600  
625  
650  
675  
700  
725  
750  
775  
46  
47  
47  
48  
48  
49  
49  
50  
50  
3.6/1.5  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.4/1.4  
3.7/1.5  
3.4/1.4  
3.8/1.6  
3.5/1.5  
46  
46  
47  
48  
48  
49  
49  
49  
50  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.8/1.6  
3.5/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
3.7/1.5  
46  
46  
47  
47  
48  
48  
49  
49  
50  
3.8/1.6  
3.5/1.5  
3.7/1.5  
3.4/1.4  
3.6/1.5  
3.3/1.4  
3.7/1.5  
3.4/1.4  
3.8/1.6  
45  
46  
47  
47  
48  
48  
49  
49  
49  
3.8/1.6  
3.6/1.5  
3.8/1.6  
3.5/1.5  
3.7/1.5  
3.5/1.4  
3.8/1.6  
3.5/1.5  
3.3/1.4  
44  
46  
46  
47  
48  
48  
48  
49  
49  
3.2/1.3  
3.8/1.6  
3.5/1.4  
3.6/1.5  
3.8/1.6  
3.6/1.5  
3.3/1.4  
3.6/1.5  
3.4/1.4  
9001  
to  
10,000  
* For 125-20 size only, input is 20,500 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.  
wc.  
20  
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Table 11—Gas Rate (Cu Ft/Hr)  
LOW-FIRE  
ON/OFF  
SWITCH  
ADJUSTMENT  
ALLEN SCREW  
(UNDER CAP)  
SIZE OF TEST DIAL  
SIZE OF TEST DIAL  
SECONDS  
FOR 1  
REVOLUTION  
SECONDS  
FOR 1  
REVOLUTION  
1
2
5
cu ft  
1
cu ft  
2
5
cu ft cu ft  
cu ft  
cu ft  
HIGH-FIRE  
10  
11  
12  
13  
14  
360  
327  
300  
277  
257  
720  
655  
600  
555  
514  
1800  
1636  
1500  
1385  
1286  
50  
51  
52  
53  
54  
72  
71  
69  
68  
67  
144  
141  
138  
136  
133  
360  
355  
346  
340  
333  
ADJUSTMENT  
ALLEN SCREW  
(UNDER CAP)  
INLET  
PRESSURE  
TAP  
O
F
F
ON  
15  
16  
17  
18  
19  
240  
225  
212  
200  
189  
480  
450  
424  
400  
379  
1200  
1125  
1059  
1000  
947  
55  
56  
57  
58  
59  
65  
64  
63  
62  
61  
131  
129  
126  
124  
122  
327  
321  
316  
310  
305  
20  
21  
22  
23  
24  
180  
171  
164  
157  
150  
360  
343  
327  
313  
300  
900  
857  
818  
783  
750  
60  
62  
64  
66  
68  
60  
58  
56  
54  
53  
120  
116  
112  
109  
106  
300  
290  
281  
273  
265  
25  
26  
27  
28  
29  
144  
138  
133  
129  
124  
288  
277  
267  
257  
248  
720  
692  
667  
643  
621  
70  
72  
74  
76  
78  
51  
50  
48  
47  
46  
103  
100  
97  
257  
250  
243  
237  
231  
95  
92  
30  
31  
32  
33  
34  
120  
116  
113  
109  
106  
240  
232  
225  
218  
212  
600  
581  
563  
545  
529  
80  
82  
84  
86  
88  
45  
44  
43  
42  
41  
90  
88  
86  
84  
82  
225  
220  
214  
209  
205  
MANIFOLD  
PRESSURE  
TAP  
A97358  
Fig. 19—Redundant Automatic Gas Control  
35  
36  
37  
38  
39  
103  
100  
97  
95  
92  
206  
200  
195  
189  
185  
514  
500  
486  
474  
462  
90  
92  
94  
96  
98  
40  
39  
38  
38  
37  
80  
78  
76  
75  
74  
200  
196  
192  
188  
184  
Valve  
BURNER FLAME  
BURNER  
40  
41  
42  
43  
44  
90  
88  
86  
84  
82  
180  
176  
172  
167  
164  
450  
439  
429  
419  
409  
100  
102  
104  
106  
108  
36  
35  
35  
34  
33  
72  
71  
69  
68  
67  
180  
178  
173  
170  
167  
45  
46  
47  
48  
49  
80  
78  
76  
75  
73  
160  
157  
153  
150  
147  
400  
391  
383  
375  
367  
110  
112  
116  
120  
33  
32  
31  
30  
65  
64  
62  
60  
164  
161  
155  
150  
a. Place duct thermometers in return and supply ducts as near  
furnace as possible. Be sure thermometers do not see heat  
exchangers so that radiant heat will not affect thermometer  
readings. This is particularly important with straight-run  
ducts.  
MANIFOLD  
A89020  
Fig. 20—Burner Flame  
b. When thermometer readings stabilize, subtract return-air  
temperature from supply-air temperature to determine tem-  
perature rise.  
NOTE: If temperature rise is outside this range, first check:  
(1.) Gas input for low- and high-heat operation.  
(2.) Derate for altitude if applicable.  
Disconnect electrical power before changing speed tap (or  
removing motor lead cap if used on 5-speed motors). A  
failure to follow this warning can cause personal injury or  
death.  
(3.) Return and supply ducts for excessive restrictions  
causing static pressures greater than 0.50-in. wc.  
NOTE: For furnaces with 5-speed motors, ensure that unused  
speed tap is either capped or, placed on SPARE terminal on control  
board before power is restored.  
c. Adjust air temperature rise by adjusting blower speed.  
Increase blower speed to reduce temperature rise. Decrease  
blower speed to increase temperature rise. For high heat,  
speed selection can be med-high, med (5-speed blowers  
only), or med-low (factory setting). For low heat, speed tap  
selection can be low (factory setting), med-low, or med  
(5-speed blowers only).  
d. To change motor speed selection for high heat, remove  
blower motor lead from control HIGH-GAS-HEAT termi-  
nal. (See Fig. 14 and Fig. 18.) Select desired blower motor  
speed lead from 1 of the other terminals and relocate it to  
HIGH-GAS-HEAT terminal. See Table 11 for lead color  
identification. Reconnect original lead to SPARE terminal  
(or use insulating cap, if used, applies only to furnaces with  
5-speed blower motors). Follow this same procedure for  
proper selection of cool and low-gas-heat speed selection.  
6. Set thermostat heat anticipator.  
a. When using a nonelectronic thermostat, the thermostat heat  
anticipation must be set to match amp draw of electrical  
21  
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1. Check primary limit control.  
Table 12—Speed Selection  
This control shuts off combustion control system and ener-  
gizes circulating-air blower motor if furnace overheats.  
COLOR  
White  
Black  
Yellow  
Orange†  
Blue  
SPEED  
Common  
High  
Med-High  
Med  
AS SHIPPED  
COM  
Cool  
SPARE  
The preferred method of checking limit control is to gradually  
block off return air after furnace has been operating for a  
period of at least 5 minutes. As soon as limit has shut off  
burners, return-air opening should be unblocked. By using this  
method to check limit control, it can be established that the  
limit is functioning properly and will operate if there is a  
motor failure.  
SPARE or Capped  
High-Gas-Heat  
Low-Gas-Heat  
Med-Low  
Low*  
Red  
* Continuous fan speed.  
† Available on 5-speed blowers only.  
2. Check draft safeguard switch.  
The purpose of this control is to permit safe shutdown of he  
furnace during certain blocked vent conditions.  
Recheck temperature rise. It must be within limits specified  
on unit rating plate. Recommended operation is at midpoint of  
rise range or above.  
a. Disconnect power to furnace and remove vent connector  
from furnace flue collar. Be sure to allow time for vent  
connector pipe to cool down before removing.  
THERMOSTAT SUBBASE  
TERMINALS WITH  
THERMOSTAT REMOVED  
(ANITICIPATOR, CLOCK, ETC.,  
MUST BE OUT OF CIRCUIT.)  
b. Restore power to furnace and set room thermostat above  
room temperature.  
c. After normal start-up, allow furnace to operate for 2  
minutes, then block flue outlet 100 percent. Furnace should  
cycle off within 2 minutes.  
HOOK-AROUND  
AMMETER  
d. Remove blockage and reconnect vent connector to furnace  
flue collar.  
R
Y
W
G
e. Wait 5 minutes and then reset draft safeguard switch.  
3. Check flow-sensing pressure switches.  
This control proves operation of draft inducer blower.  
a. Turn off 115-v power to furnace.  
b. Remove gas control door and disconnect inducer motor  
lead wires from wire harness.  
10 TURNS  
c. Turn on 115-v power to furnace  
d. Close thermostat switch as if making normal furnace start.  
If hot surface ignitor does not glow within several minutes  
and control flashes code 32, pressure switches are func-  
tioning properly.  
FROM UNIT 24-V  
CONTROL TERMINALS  
0.5 AMPS FOR THERMOSTAT  
5.0 AMPS ON AMMETER  
=
EXAMPLE:  
ANTICIPATOR SETTING  
10 TURNS AROUND JAWS  
e. Turn off 115-v power to furnace.  
A96316  
Fig. 21—Amp Draw Check With Ammeter  
f. Reconnect inducer motor wires, replace gas control door,  
and turn on 115-v power to furnace.  
components in R-W/W1 circuit. Accurate amp draw read-  
ings can be obtained at wires normally connected to  
thermostat subbase terminals R and W/W1. Fig. 21 illus-  
trates an easy method of obtaining actual amp draw. The  
amp reading should be taken after blower motor has started  
and furnace is operating in low heat. To operate furnace in  
low heat, first move SW-2 to ON position, THEN connect  
ammeter wires as shown in Fig. 21. The thermostat  
anticipator should NOT be in this circuit while measuring  
current. If thermostat has no subbase, thermostat MUST be  
disconnected from R and W/W1 wires during current  
measurement. Return SW-2 to final desired location after  
completing reading. See thermostat manufacturer’s instruc-  
tions for adjusting heat anticipator and for varying heating  
cycle length.  
4. Check auxiliary limits.  
a. Turn off 115-v power to furnace.  
b. Remove blower access door.  
c. Disconnect red motor lead at blower speed selector. Mark  
terminal for proper reconnection.  
d. Replace blower access door.  
e. Turn on 115-v power to furnace. Be sure room thermostat  
is calling for low heat.  
f. Allow furnace to operate until auxiliary limit activates, but  
DO NOT operate furnace longer than 4 minutes.  
g. If furnace operates for 4 minutes, check/replace limit  
switch(es).  
b. When using an electronic thermostat, set cycle rate for 3  
cycles per hr.  
h. Turn off 115-v power to furnace.  
i. Remove blower access door.  
CHECK SAFETY CONTROLS  
j. Reconnect red motor lead, reset switch, and replace door.  
k. Turn on 115-v power to furnace.  
The flame sensor, gas valve, and pressure switches were all  
checked in the Start-Up section as part of normal operation.  
22  
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CHECKLIST  
5. Cycle test furnace with room thermostat.  
1. Put away tools and instruments, and clean up debris.  
6. Check operation of accessories per manufacturer’s instruc-  
tions.  
2. Check SW-1 through SW-4 after completing installation to  
ensure desired settings for thermostat type (SW-1 and SW-2)  
and blower off delay (SW-3 and SW-4). Refer to Tables 6 and  
7.  
7. Review User’s Manual with owner.  
8. Leave literature packet near furnace.  
3. Verify manual reset switches have continuity.  
4. Ensure blower and gas control access doors are properly  
installed.  
23  
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SERVICE TRAINING  
Packaged Service Training programs are an excellent way to increase your  
knowledge of the equipment discussed in this manual, including:  
• Unit Familiarization • Maintenance  
• Installation Overview • Operating Sequence  
A large selection of product, theory, and skills programs is available, using popular  
video-based formats and materials. All include video and/or slides, plus companion  
book.  
Classroom Service Training plus "hands-on" the products in our labs can mean  
increased confidence that really pays dividends in faster troubleshooting, fewer  
callbacks. Course descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-644-5544  
[ ] Packaged Service Training [ ] Classroom Service Training  
A94328  
Copyright 1997 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
58tma6si  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 6a 8a  
1
4
PC 101  
Catalog No. 535-887  
Printed in U.S.A.  
Form 58TMA-6SI  
Pg 24  
8-97  
Replaces: 58TMA-4SI  
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