Bryant 820SB Installation, Operating, & Maintenance Instructions

820SB/821SB
80% AFUE, Non-Communicating, Single Stage,
Variable 25-Speed, ECM Motor, 4-Way Multipoise,
Non-Condensing Gas Furnace with InteliSense™
Read the entire instruction manual before starting the installation.

TABLE OF CONTENTS

Table 1 - Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCE-
DURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
AIR FOR COMBUSTION AND VENTILATION . . . . . . . . . . . . . . 7
Table 2 - Minimum Free Area Required for Each Combustion Air
opening of Duct to Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3 - Minimum Space Volumes for 100% Combustion, Ventila-
tion, and Dilution from Indoors . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4 - Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 10
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 5 - Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . . 14
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 6 - Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INTELISENSE™ TECHNOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . 17
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 7 - Combined Appliance Maximum Input Rating
in Thousands of BTUh per Hour . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 8 - Minimum Allowable Input Rating of
Space-Heating Appliance in Thousands of BTUh per Hour . . . . 20
Table 9 - Recommended Minimum Vent Height Per Furnace and Vent
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AIR DELIVERY - CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 10 - Air Delivery - CFM (with filter)* . . . . . . . . . . . . . . . 24
Table 11 - Default Airflow Settings . . . . . . . . . . . . . . . . . . . . . . 28
FURNACE CONTROL PROGRAMMING
AND NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 12 - System Status Display Codes. . . . . . . . . . . . . . . . . . . 28
Table 13 - Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 14 - Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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
Installation, Start-Up, Operating and
Service and Maintenance Instructions
on the referenced subject, which is represented only by the standard in its entirety.
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 15 - Altitude Derate Multiplier for U.S.A. . . . . . . . . . . . . 33
Table 16 - Gas Rate (CU ft./hr). . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 17 - Orifice Size* and Manifold Pressure (in. w.c.) for Gas Input
RateTabulated Data Based on 22,000 BTUh per burner . . . . . . . 34
Table 18 - Orifice Size* and Manifold Pressure (in. w.c.) for Gas Input
Rate Tabulated Data Based on 21,000 BTUh per burner . . . . . . 34
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 36
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 19 - Filter Size Information - In. (mm) . . . . . . . . . . . . . . . 38
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
GAS FURNACE CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 47
MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
To learn more about this appliance and installation via a mobile device,
go to https://bryant.hvacpartners.com/NFC
access airflow tables or troubleshooting guide on your mobile device go
to mlctraining.com/training/techdocs/82/
To learn more about InteliSense, go to
or use the QR code below.
Mobile App QR Code
or use the QR code below. To
or use the QR code below.
Bryant.hvacpartners.com/InteliSense
Airflow QR Code
A230210
A200103