Bryant 912SB User Manual

1
912SC ALL
912SB 048080 SIZE ONLY
SINGLE STAGE 4 --WAY MULTI POISE
CONDENSING GAS FURNACE
Installation, Start--up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the installation.
SECTIONS
SAFETY CONSIDERATIONS 3.........................
INTRODUCTION 4...................................
CODES AND STANDARDS 4...........................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 5...
ACCESSORIES 5.....................................
LOCATION 8........................................
AIR FOR COMBUSTION AND VENTILATION 9..........
CONDENSATE TRAP 13...............................
CONDENSATE DRAIN 17.............................
INSTALLATION 21...................................
AIR DUCTS 31.......................................
GAS PIPING 33......................................
ELECTRICAL CONNECTIONS 34.......................
VENTING 40........................................
START -- UP, ADJUSTMENT, AND SAFETY CHECK 64......
SERVICE AND MAINTENANCE PROCEDURES 73........
SEQUENCE OF OPERATION 81........................
PARTS REPLACEMENT GUIDE 85......................
CERTIFIED
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.
Portions of the text and tables are reprinted from current edition of
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.
TABLES
Loose Parts Bag 5.....................................
Minimum Clearances to Combustible Materials 5.............
Minimum Free Area Required 11.........................
Minimum Space Volumes 11.............................
Filter Size Information 24...............................
Opening Dimensions 26................................
Air Delivery CFM 32...................................
Maximum Capacity of Pipe 34...........................
Electrical Data 34......................................
Vent Termination Kit for Direct Vent (2--Pipe) System 42.......
Hangar Spacing 46.....................................
Combustion--Air Vent Pipe, Fitting & Cement Material.. 48.....
Maximum Allowable Exposed Vent Lengths Insulation 49......
Maximum Equivalent Vent Length 50......................
Deductions from Maximum Equivalent Vent Length 50........
Blower Off Delay Setup Switch 67........................
Altitude Derate Multiplier for U.S.A. 68....................
Gas Rate 70..........................................
Orifice Size and Manifold Pressure 71.....................

Bryant 912SB Specifications

General

Model	912SB
Efficiency Rating	High Efficiency
Heating Capacity	40, 000-120, 000 BTU/h
Ignition Type	Hot Surface Ignition
Fuel Type	Natural Gas
Warranty	10-Year Limited Warranty

Summary

SAFETY CONSIDERATIONS

General Safety Warnings

Warns of general hazards including fire, explosion, electrical shock, and CO poisoning.

Chemical Contamination and Fire Hazards

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

ESD Protection Procedure

Step-by-step instructions for preventing electrostatic discharge damage to electronic controls.

AIR FOR COMBUSTION AND VENTILATION

Combustion Air Requirements

CONDENSATE TRAP

CONDENSATE DRAIN CONNECTION

Drain Line Freeze Protection

Precautions and methods to prevent freezing of condensate drain lines and traps.

Right and Left Side Drain Connections

INSTALLATION

Return Air Connection Configurations

GAS PIPING

Gas Piping Fire and Explosion Hazards

Critical warnings about gas piping installation to prevent fire or explosion.

ELECTRICAL CONNECTIONS

Electrical Safety Warnings

Critical warnings regarding electrical hazards like shock, fire, and explosion.

J-Box and External Wiring Installation

VENTING

Venting System Requirements

Vent Termination Clearances

Guidelines and recommendations for safe placement and clearances of vent terminations.

Venting System Length Calculations

Detailed method for calculating total equivalent vent length and comparing it to maximum allowable lengths.

Combustion Air and Vent Piping Installation

START-UP, ADJUSTMENT, AND SAFETY CHECK

Initial Start-up Procedures and Notices

Gas Pressure and Orifice Adjustments

Procedures for adjusting manifold pressure and checking gas input rates based on altitude and gas properties.

Blower Speed and Temperature Rise Adjustment

Guidance on adjusting blower speed and temperature rise for optimal heating and cooling performance.

Safety Control Checks

Procedures for testing limit, pressure, and flame-proving safety controls to ensure proper operation.

SERVICE AND MAINTENANCE PROCEDURES

Furnace Troubleshooting Guide

Steps to diagnose and resolve furnace operational issues using status codes and troubleshooting logic.

Component Self-Test and Checklist

Instructions for performing component self-tests and a final installation checklist.

Burner and Igniter Servicing

SEQUENCE OF OPERATION

Heating Cycle Operation