935SB
Up to 95% AFUE, Single-Stage, Upflow/Horizontal
Ultra Low NOx, 35-in. Tall, Condensing Gas Furnace
Installation, Start-up, Operating and Service Maintenance
NOTE: Read the entire instruction manual before starting the
installation
Approved for installations up to 5,400 feet (1646 meters)
TABLE OF CONTENTS
IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 1 - Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table 2 - Minimum Clearances to Combustible Materials for All Units
5
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3 - Loose Parts Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCE-
DURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4 - Minimum Free Area Required for Each Combustion Air
Opening or Duct to Outdoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 5 - Minimum Space Volumes for 100% Combustion, Ventila-
tion and Dilution Air from Outdoors . . . . . . . . . . . . . . . . . . . . . . 10
CONDENSATE TRAP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 6 - Condensate Trap Configurations . . . . . . . . . . . . . . . . . 13
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7 - Evaporator Coil Spacer or Shield Requirements. . . . . 16
Table 8 - Air Filter Selection and Duct Sizing - In. (mm) . . . . . 21
Table 9 - Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 21
Table 10 - Filter Media Pressure Drop (Clean) Versus Airflow - in.
w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 11 - Filter Media Pressure Drop (Clean) Versus Face Velocity-
in. w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 12 - Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 24
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 13 - Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 14 - Vent Termination Kit for Direct Vent (2-pipe) Systems29
Table 15 - Approved Combustion-Air and Vent Pipe, Fitting and Ce-
ment Materials (U.S.A. Installations) . . . . . . . . . . . . . . . . . . . . . 29
Table 16 - Maximum Equivalent Vent Length - Ft. . . . . . . . . . . 37
Table 17 - Deductions from Maximum Equivalent Vent Length - Ft.
(M) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 18 - Maximum Allowable Exposed Vent Length in Uncondi-
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.
tioned Space - Ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 19 - Hanger Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 20 - Air Delivery - CFM (with filter) . . . . . . . . . . . . . . . . 44
Table 21 - Airflow Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 22 - System Status Display Codes . . . . . . . . . . . . . . . . . . 46
Table 23 - Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 24 - Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 25 - Altitude Derate Multiplier for USA. . . . . . . . . . . . . . 50
Table 26 - Gas Rate (CU ft./hr). . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 27 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 40,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 28 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 60,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 29 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 80,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 30 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 100,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
WINTERIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
TRAINING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
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