F80CTL and G80CTL
80% Variable-Speed
Category I, Non-Condensing, 33-1/3 in. Gas Furnace
(Series A)
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 1 - Minimum Free Area Required for Each Combustion Air
opening of Duct to Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2 - Minimum Space Volumes for 100% Combustion, Ventila-
tion, and Dilution from Indoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3 - Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . . . . 10
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4 - Air Delivery - CFM (With Filter). . . . . . . . . . . . . . . . . . . 13
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 5 - Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . . . . 18
Table 6 - Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
J-BOX RELOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 7 - Minimum Allowable Input Rating of
Table 8 - Combined Appliance Maximum Input Rating
Table 9 - Recommended Minimum Vent Height Per Furnace and Vent
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 10 - Altitude Derate Multiplier for U.S.A.. . . . . . . . . . . . . . . 30
Table 11 - Gas Rate (CU ft./hr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 12 - Blower Off Delay Setup Switch . . . . . . . . . . . . . . . . . . . 32
Table 13 - Cooling Airflow Adjustments from 1.5 to 6 Tons . . . . . 33
Table 14 - Furnace Setup Switch Description . . . . . . . . . . . . . . . . . 34
Installation, Start-Up, Operating and
Service and Maintenance Instructions
Table 15 - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input
Rate (Tabulated Data Based on 22,000 Btuh High-Heat/14,500 Btuh
for Low-Heat per Burner, Derated 4 Percent for Each 1000 Ft. (305 M)
Above Sea Level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 16 - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input
Rate (Tabulated Data Based on 21,000 Btuh High-Heat/14,500 Btuh
for Low-Heat Per Burner, Derated 4 Percent for Each 1000 Ft. (305 M)
Above Sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 17 - Filter Size Information - In. (mm) . . . . . . . . . . . . . . . . . 40
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
CASING GROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
ELECTRICAL GROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
BLOWER GROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
INDUCER GROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Use of the AHRI Certified TM Mark indicates
a manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
NOTE: Read the entire instruction manual before starting the
installation.
Portions of the text and tables are reprinted from NFPA 54/ANSI
Z223.1E, with permission of National Fire Protection Association,
Quincy, MA 02269 and American Gas Association, Washington DC
20001. This reprinted material is not the complete and official position
of the NFPA or ANSI on the referenced subject, which is represented
only by the standard in its entirety.
A200115