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Bosch BGH96 Series User Manual

Bosch BGH96 Series
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Bosch 96% AFUE Gas Furnace BGH96 Model
Condensing Gas Furnace
Installation, Operation, and Maintenance Manual
3124627

Table of Contents

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Bosch BGH96 Series Specifications

General IconGeneral
SeriesBGH96
AFUEUp to 96%
Blower MotorVariable Speed ECM
Fuel TypeNatural Gas
Heating Capacity60, 000 to 120, 000 BTU/hr
StagesModulating
Heat ExchangerStainless Steel
WarrantyLimited Lifetime (Heat Exchanger)

Summary

Key Symbols and Safety Instructions

1.2 Safety and Hazard Warnings

General safety advice, fire/explosion hazards, water damage, and fuel type warnings.

Safety Precautions and Requirements

Safety Precautions and Requirements

Covers fire, electrical, carbon monoxide hazards, installation, and leak checks.

Operational Safety Checks and Warnings

Operational Safety Checks and Warnings

Pre-season checks, lighting/shutdown, air openings, and Proposition 65.

Introduction

Hazard Warnings

Warnings about furnace orientation and improper adjustment or service.

Codes and Standards

Electrostatic Discharge (ESD) Precautions

Location

Location Requirements and Warnings

Placement, clearances, chemical exposure, and CO hazard warning.

Installation Hazard Warnings

Installation Hazard Warnings

Warnings for garage installation and use during construction.

Installation

7.3 Condensate Line and Overflow Switch

Filter Arrangement

Filter Safety and Installation

Safety warnings about filters and installation guidance.

Air Ducts

Combustion Air and Vent System

Combustion Air and Vent Piping Assembly

Combustion Air / Venting

Vent System

Combustion & Ventilation Air Requirements

Combustion Air Connection and Hazard Warnings

Outdoor air connection, ambient air, and CO hazard warnings.

Combustion Air Supply Hazards and Requirements

Combustion Air Supply Hazards and Requirements

Warnings about inadequate air supply and requirements for confined spaces.

Vent and Supply (Outside) Air Safety Check Procedure

Ventilation System Safety Check Procedure

Procedure to detect ventilation issues causing unsafe conditions.

Gas Supply and Piping

Gas Supply and Piping Safety Warnings

Warnings regarding gas purging, leak testing, pipe length, and connections.

9.2 High Altitude Derate Procedures

9.2 High Altitude Derate Procedures

Procedures for calculating derates for high altitude installations.

9.3 Propane Gas (LP) Conversion

Gas Piping Connection Details and Checks

Gas Piping Connection Details and Checks

Specifics for connecting piping, leak testing, and safety warnings.

Electrical Connections

Electrical Safety Warnings

Warnings about blower door switch, grounding, and wire types.

Furnace Control and Wiring Diagrams

Start-Up, Adjustment, and Safety Check

General Start-Up and Safety Information

General info on safety circuits, controls, and hazard warnings.

Start-Up Procedures and Leak Checks

Step-by-step guide for starting the furnace and checking for leaks.

Furnace Shutdown Procedure and Sequence of Operation

Furnace Shutdown Procedure and Sequence of Operation

Steps to shut down the furnace and details of its operation modes.

11.5 Gas Manifold Pressure Measurement and Adjustment

11.5 Gas Manifold Pressure Measurement and Adjustment

Procedure for measuring and adjusting gas manifold pressure.

11.6 Gas Input Rate Measurement

11.6 Gas Input Rate Measurement

Procedure for measuring natural gas input rate using the gas meter.

11.7 Temperature Rise Adjustment

Procedure for adjusting temperature rise by changing blower speed.

11.8 Circulator Blower Speed Adjustment

11.8 Circulator Blower Speed Adjustment

Procedure for adjusting blower speed to meet installation requirements.

Operational Checks

General Operational Hazards and Burner Flame Inspection

Dangers during checks, burner flame inspection, and safety circuit overview.

Troubleshooting

ESD Precautions and Lockout Reset

Precautions for ESD and procedures for resetting furnace lockout.

Troubleshooting Chart (Part 1)

Troubleshooting Chart (Part 2)

Service and Maintenance Procedures

Wiring Diagram

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