58TMA
Downflow/Horizontal 2-Speed,
2-Stage Induced-Combustion Gas Furnace
Installation, Start-Up, and Operating Instructions
Series 100, Sizes 065-125
NOTE:
Read the entire instruction manual before starting the
installation.
Index
Page
SAFETY CONSIDERATIONS .....................................................1
Clearances to Combustibles......................................................1
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE ...........................................................................2
INTRODUCTION ..........................................................................2
Dimensional Drawing ....................................................................3
LOCATION....................................................................................3
General ......................................................................................2
Location Relative to Cooling Equipment ................................3
Hazardous Locations.................................................................3
AIR FOR COMBUSTION AND VENTILATION ...................3-5
Unconfined Space .....................................................................4
Confined Space......................................................................4-5
SUPPLY-AIR PLENUM INSTALLATION
(DOWNFLOW) ........................................................................5
Installation On a Concrete Slab ...............................................5
Installation On a Combustible Floor ....................................5-6
HORIZONTAL ATTIC INSTALLATION ...................................6
HORIZONTAL CRAWLSPACE INSTALLATION....................6
FILTER ARRANGEMENT...........................................................6
GAS PIPING...............................................................................6-7
ELECTRICAL CONNECTIONS...............................................7-8
115-v Wiring..........................................................................7-8
24-v Wiring...............................................................................8
Accessories................................................................................8
VENTING ......................................................................................8
START-UP, ADJUSTMENT, AND SAFETY CHECK .........9-17
General.................................................................................9-10
Sequence of Operation ......................................................10-13
Adaptive Heating Mode ....................................................10-12
Non-Adaptive Heating Mode .................................................12
Cooling Mode ....................................................................12-13
Continuous Blower Mode.......................................................13
Heat Pump Mode ....................................................................13
Defrost Mode ..........................................................................13
Start-Up Procedures...........................................................13-17
Adjustments .......................................................................14-16
Set Gas Input Rate ............................................................14-15
Set Temperature Rise ........................................................15-16
Set Thermostat Heat Anticipator ......................................16-17
Check Safety Controls ............................................................17
Checklist..................................................................................17
SAFETY CONSIDERATIONS
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. 54-1992/ANSI Z223.1-1992.
In Canada, refer to the current edition of the National Standard of
®
ama
CANADIAN GAS ASSOCIATION
A PP R O VED
R
Table 1— Clearances to Combustible
Materials (In.)
UNIT SIZE
065 AND 085 105 AND 125
DOWNFLOW (IN ALCOVE OR CLOSET)
Sides
Single-Wall Vent
1*
0
Type B-1 Double-Wall Vent
0
0
Back
0
0
Top
1
1
Front†
(See Notes)
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
3
3
Vent
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
1
1
HORIZONTAL POSITION (IN ALCOVE, ATTIC, AND
CRAWLSPACE)
Sides‡
1
1
Back
0
0
Top
Single-Wall Vent
1
1
Type B-1 Double-Wall Vent
1
1
Front†
(See Notes)
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
3
3
Vent
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
1
1
HORIZONTAL POSITION (IN CLOSET)
Sides‡ **
1
1
Back
3
3
Top
Single-Wall Vent
2
2
Type B-1 Double-Wall Vent
2
2
Front
(See Notes)
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
3
3
Vent
Single-Wall Vent
6
6
Type B-1 Double-Wall Vent
1
1
* For casing widths larger than 14-1/4 in., 0 clearance may be used.
† 18 in. front clearance required for alcove.
‡ Clearance shown is for the outlet end. The inlet end must maintain 6 in.
clearance from flue to combustible materials when using single-wall vent.
** Indicates supply or return sides when furnace is in the horizontal position.
NOTES:
1. Provide 30-in. front clearance for servicing. An open door in front of the
furnace can meet this requirement.
2. A minimum clearance of 3 in. must be provided in front of the furnace for
combustion air and proper operation.
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. 535-824
Printed in U.S.A.
Form 58TMA-3SI
Pg 1
6/94
Replaces: 58TMA-2SI
