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Bryant 912SC User Manual

Bryant 912SC
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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
manufacturers 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.....................

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Bryant 912SC Specifications

General IconGeneral
Model912SC
TypeGas Furnace
Efficiency Rating92.1% AFUE
Heating Capacity40, 000-120, 000 BTU/h
Blower TypeVariable Speed
StagesSingle-stage
Blower Motor TypeECM
Ignition TypeHot Surface Ignition
Fuel TypeNatural Gas
Warranty10-year limited warranty
Warranty on Heat Exchanger20 Years Limited
Warranty on Parts10-year limited warranty

Summary

Required Notice for Massachusetts Installations

Safety Considerations

Fire, Explosion, Electrical Shock, and Carbon Monoxide Poisoning Hazards

Critical hazards related to fire, explosion, electrical shock, and CO poisoning.

Fire Hazard

Warnings regarding combustible materials and ignition sources.

Furnace Reliability Hazard

Cautions about potential damage to unit components due to improper use.

Cut Hazard

Safety advice for handling sheet metal parts with sharp edges.

Codes and Standards

Introduction

Electrical Connections

Condensate Drain Connection

Electrostatic Discharge (ESD) Precautions Procedure

Accessories

Location

Personal Injury and/or Property Damage Hazard

Hazards associated with improper furnace use or installation.

Carbon Monoxide Poisoning / Component Damage Hazard

Risks of CO poisoning and component damage from contaminated air.

Fire, Injury or Death Hazard

Safety warnings for installing the furnace in a garage or hazardous atmosphere.

Air for Combustion and Ventilation

Fire Hazard (Air for Combustion)

Warning about potential fire hazards related to improper venting.

Furnace Corrosion Hazard

Hazards of air contaminants corroding furnace components.

Carbon Monoxide Poisoning Hazard (Air)

Risks from negative pressure conditions affecting furnace operation.

Standard Method (Combustion Air)

Known Air Infiltration Rate Method (Combustion Air)

Combination of Indoor and Outdoor Air

Condensate Trap

Condensate Trap - Upflow Orientation

Notes for upflow installation where trap relocation is not needed.

Condensate Trap - Downflow Orientation

Procedure for relocating the condensate trap for downflow installations.

Condensate Trap - Horizontal Orientation

Steps for repositioning the condensate trap in horizontal orientations.

Condensate Drain Connection

Frozen and Burst Water Pipe Hazard

Precautions against freezing that could cause property damage.

Property Damage Hazard

Warnings about potential damage from plugged drains or failed pumps.

Upflow/Downflow Orientation

Routing condensate drain for upflow/downflow installations.

For Right Side Condensate Drain

Detailed steps for making the right-side condensate drain connection.

For Left Side Condensate Drain Connection

Detailed steps for making the left-side condensate drain connection.

Installation

Upflow Installation

Specific requirements for installing the furnace in an upflow configuration.

Supply Air Connections

Instructions for connecting the supply-air ductwork to the furnace.

Return Air Connections

Bottom Return Air Inlet

Instructions for using the bottom opening for return air.

Side Return Air Inlet

Instructions for using side openings for return air, with configuration notes.

Filter Arrangement

Air Ducts

General Requirements (Air Ducts)

General guidelines for duct system design, sizing, and sealing.

Return Duct Sizing

Guidance on properly sizing return ductwork and filtering systems.

Ductwork Acoustical Treatment

Methods for treating ductwork to reduce noise and vibration.

Gas Piping

Fire or Explosion Hazard (Gas Piping)

Critical safety warnings regarding gas leaks and open flames.

Furnace Damage Hazard (Gas Piping)

Cautions to prevent damage to gas controls and burner alignment.

Gas Pipe Grommet

Specific requirement for sealing gas pipe entry in direct-vent applications.

115-V Wiring

J-Box Installation

External Electrical Box on Furnace Casing

Power Cord Installation in Furnace J-Box

BX Cable Installation in Furnace J-Box

24-V Wiring

Electrical Accessories

Alternate Power Supplies

Venting

Special Venting Requirements for Installations in Canada

Specific requirements for Canada, conforming to CSA B149 code.

Carbon Monoxide Poisoning Hazard (Venting)

Recommended Support for Vent Termination

Direct Vent / 2-Pipe System

Ventilated Combustion Air Systems

Non-Direct Vent / 1-Pipe System

Optional Combustion Air Inlet Pipe Configuration

Recommended Combustion Air Inlet Moisture Trap

Additional Information for Polypropylene Venting Systems

Install Vent Pipe and Combustion Air Pipe Adapters

Venting System Length Calculations

Start-Up, Adjustment, and Safety Check

Prime Condensate Trap with Water

Essential step to ensure proper drainage and prevent CO release.

Purge Gas Lines

Steps to safely purge gas lines and check for leaks.

Adjustments

Fire Hazard (Adjustments)

Warning about improper regulator adjustment affecting safety.

Furnace Damage Hazard (Adjustments)

Caution against incorrect orifice handling causing burner noise or flame issues.

Check Inlet Gas Pressure

Verifying inlet gas pressure is within the specified range for maximum heat.

Adjust Manifold Pressure

Adjust Temperature Rise

Adjust Blower Off Delay (Heat Mode)

Adjust Cooling Airflow

Adjust Thermostat Heat Anticipator

Check Safety Controls

Service and Maintenance Procedures

Electrical Controls and Wiring

Understanding furnace wiring and control connections.

Troubleshooting

Using the service label and troubleshooting guide to diagnose issues.

Component Self-Test

Procedure to test individual furnace components for proper function.

Care and Maintenance

Fire or Explosion Hazard (Maintenance)

Warnings about storing flammable materials near the furnace.

Electrical Shock and Fire Hazard (Maintenance)

Safety precautions for performing maintenance or service.

Carbon Monoxide Poisoning and Fire Hazard (Maintenance)

Warning about operating furnace without a filter or with access doors removed.

Blower Motor and Wheel Maintenance

Flushing Collector Box and Drainage System

Cleaning Condensate Drain and Trap

Cleaning Heat Exchangers

Sequence of Operation

Heating Mode

Detailed sequence of operations during the heating cycle.

Cooling Mode

Detailed sequence of operations during the cooling cycle.

Continuous Blower Mode

Operation of the blower when only the fan is activated.

Heat Pump Operation

How the furnace operates in conjunction with a heat pump system.

Component Self-Test

Procedure to initiate the furnace's component self-test sequence.

Troubleshooting Guide

Parts Replacement Information Guide

Model Nomenclature

Explanation of the furnace model number designation.

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