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Bryant 926TB User Manual

Bryant 926TB
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926TB
TWO--STAGE, VARIABLE--SPEED ECM
MULTIPOISE 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 4.........................
INTRODUCTION 5...................................
CODES AND STANDARDS 6...........................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 6...
ACCESSORIES 6.....................................
LOCATION 7........................................
AIR FOR COMBUSTION AND VENTILATION 9..........
CONDENSATE TRAP 12...............................
CONDENSATE DRAIN 13.............................
INSTALLATION 17...................................
AIR DUCTS 30.......................................
GAS PIPING 30......................................
ELECTRICAL CONNECTIONS 32.......................
VENTING 38........................................
START-- UP, ADJUSTMENT, AND SAFETY CHECK 60......
SERVICE AND MAINTENANCE PROCEDURES 70........
SEQUENCE OF OPERATION 78........................
PARTS REPLACEMENT GUIDE 84......................
TABLES
Loose Parts Bag Contents 5..............................
Minimum Clearances to Combustible Materials 5.............
Minimum Free Area Required 11.........................
Minimum Space Volumes 11.............................
Filter Size Information 23...............................
Opening Dimensions 23................................
Air Delivery CFM 26...................................
Maximum Capacity of Pipe 31...........................
Electrical Data 35......................................
Combustion--Air Vent Pipe, Fitting & Cement Material.. 40.....
Vent Termination Kit for Direct Vent (2--Pipe) Systems 41......
Hangar Spacing 49.....................................
Maximum Allowable Exposed Vent Lengths Insulation 52......
Maximum Equivalent Vent Length 53......................
Deductions from Maximum Equivalent Vent Length 53........
Altitude Derate Multiplier for U.S.A. 68....................
Blower Off Delay Setup Switch 68........................
Gas Rate 68..........................................
Orifice Size and Manifold Pressure 69.....................
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 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.

Table of Contents

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Bryant 926TB Specifications

General IconGeneral
StagesTwo-Stage
Blower MotorVariable-Speed
Gas ValveModulating
Fuel TypeNatural Gas
Warranty10-Year Parts Limited Warranty
Heating Capacity40, 000 to 120, 000 BTU/h

Summary

Safety Considerations

General Safety Warnings and Symbols

Covers fire, electrical, CO hazards, and safety alert symbol usage.

Important Installation and Start-up Procedures

Procedures to avoid nuisance smoke or odor complaints after installation.

Introduction

Furnace Description and Approval

Furnace CSA design certification, fuel types, and installation limitations.

Codes and Standards

Applicable Codes and Standards

Outlines national and local codes for installation, safety, and system components.

Electrostatic Discharge (ESD) Precautions

ESD Procedure and Precautions

Steps to prevent damage to electronic controls from static discharge during installation/servicing.

Location

Installation Location Hazards and Requirements

Covers hazards and specific requirements for furnace placement, combustion air, and temperature.

Prohibited Installations and Orientations

Details on forbidden furnace orientations and installation locations to ensure safety and proper function.

Air for Combustion and Ventilation

Combustion Air Requirements

Explains direct, non-direct, and ventilated air options and general requirements.

Airflow Calculations and Methods

Details methods for calculating required combustion and ventilation air based on space volume and infiltration rates.

Condensate Trap

Condensate Trap Relocation and Configuration

Instructions for orienting and relocating the condensate trap for proper drainage based on furnace position.

Condensate Drain Connection and Protection

Warnings about freezing hazards and instructions for connecting the condensate drain line.

Condensate Drain

Condensate Drain Routing and Connections

Detailed steps for routing the condensate drain line for right and left side connections.

Installation

Furnace Support and Roll-Out Protection

Guidance on supporting the furnace and providing flame roll-out protection during installation.

Return Air Connections and Leveling

Instructions for connecting return air ducts and installing leveling legs for proper furnace placement.

Filter Arrangement and Duct Sizing

Information on filter types, arrangement, and considerations for duct sizing based on pressure drop.

Furnace Pitch and Opening Dimensions

Requirements for furnace pitch and dimensions for floor/plenum openings based on application.

Air Ducts

General Duct System Requirements

Guidelines for designing duct systems, including sealing, insulation, and clearances.

Gas Piping

Gas Piping Safety Warnings

Hazards associated with gas piping installation, including purging and leak testing.

Gas Pipe Sizing and Installation

Recommendations for gas pipe sizing, typical arrangement, and pressure tap usage.

Electrical Connections

Electrical Safety Warnings

Hazards related to electrical connections, grounding, and servicing procedures.

115-V Wiring and J-Box Installation

Instructions for connecting 115-V power and installing the junction box for electrical connections.

Field Wiring and 24-V Connections

Guidance on making field wiring connections for power and low-voltage 24-V circuits.

Electrical Specifications and Accessories

Electrical data for furnace models, and information on connecting thermostats and accessories like EAC/Humidifier.

Venting

Venting System Planning and Requirements

Covers planning, Canadian requirements, safety, materials, and termination guidelines.

Vent Pipe Installation and Calculations

Details on calculating vent length, pipe sizing, installation procedures, and support.

Vent Termination Installation

Steps for installing various vent terminations on roofs and sidewalls.

Start-Up, Adjustment, and Safety Check

Furnace Start-up and Setup Switch Configuration

Procedures for initial start-up, safety checks, and configuring furnace setup switches.

Adjustments and Gas Pressure Settings

Instructions for adjusting manifold pressure, checking gas leaks, and setting temperature rise.

Gas Input Rate and Meter Clocking

Procedures for checking gas input rate by clocking the meter and verifying manifold pressure.

Temperature Rise and Blower Adjustments

How to measure and adjust temperature rise, and set blower speeds for cooling/continuous fan.

Start-Up, Adjustment, and Safety Check

Blower Speed, Cooling, and Dehumidification Settings

Configuring blower speeds for cooling, heat pump, dehumidification, and continuous fan modes.

Pre-Operation Checklist and Safety Control Checks

Final checks for safety controls, wiring, and overall system readiness before operation.

Service and Maintenance Procedures

General Maintenance and Safety Precautions

General maintenance tasks and safety warnings for servicing the furnace.

Troubleshooting and Component Self-Test

Guide for diagnosing issues using status codes and performing component self-tests.

Air Filter and Blower Motor Maintenance

Instructions for cleaning/replacing air filters and maintaining the blower motor and wheel.

Blower Assembly Servicing

Detailed steps for removing, cleaning, and reinstalling the blower assembly.

Service and Maintenance Procedures

Burner and Flame Sensor Cleaning

Procedures for cleaning the burners and flame sensor for optimal performance.

Igniter Servicing and Drainage System Flushing

Steps for servicing the hot surface igniter and flushing the condensate collector box and drain system.

Heat Exchanger Cleaning

Procedures for cleaning primary heat exchangers, noting when replacement is necessary.

Winterization Procedures

Steps to protect the furnace from freezing in unconditioned spaces during cold weather.

Parts Replacement Information Guide

Replacement Parts by Group

Lists components categorized into Casing, Electrical, Blower, Filter, Gas Control, Heat Exchanger, and Inducer groups.

How to Obtain Replacement Parts

Instructions on how to contact dealers or the manufacturer for obtaining replacement parts.

Model Nomenclature and Specifications

Details on how to identify the furnace model and its basic specifications.

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