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This document is the User's Information Manual for the Bosch 96% AFUE Gas Furnace BGH96 Model, a condensing gas furnace designed for quality, performance, and comfort. It provides essential information for users to understand how the furnace operates, as well as basic maintenance and upkeep to ensure optimal performance.
The Bosch 96% AFUE Gas Furnace is a heating appliance that utilizes natural gas or propane gas (LP) to generate heat for residential spaces. It is equipped with an automatic ignition device, meaning users should not attempt to light the burner manually. The furnace operates by drawing in air, which is then heated by burners and distributed throughout the building by a circulating fan blower. Combustion products are safely vented outside through an exhaust system. The furnace's operation is controlled by a thermostat, which signals the unit to start and stop based on desired room temperature. A key feature is its 96% AFUE (Annual Fuel Utilization Efficiency) rating, indicating high energy efficiency in converting fuel to heat.
The manual outlines a straightforward process for furnace start-up and shutdown. For start-up, users need to ensure the manual gas shutoff valve is closed, electrical power is off, the room thermostat is set to its lowest possible setting, and the burner access panel is removed. The gas valve switch should then be pushed to the OFF position. After waiting five minutes to clear any gas, and confirming no gas smell, the gas valve switch can be moved to the ON position. Electrical power is then turned on, and the thermostat is set to slightly above room temperature to initiate the heating cycle. The furnace's control system manages the ignition sequence, including a warm-up period for the ignitor and a "retry" sequence if flame is not detected. Once the burner flame is proven, the blower motor energizes to distribute heated air. There is an approximate 48-second delay between the thermostat energizing and the burner firing.
For furnace shutdown, especially in case of malfunction, the user should set the thermostat to OFF or its lowest temperature, turn off the electrical power, turn off the main gas supply at the manual valve, remove the burner access panel, move the appliance gas valve switch to the "OFF" position, and then replace the burner access panel. If the shutdown is due to a malfunction, contacting a contractor immediately is advised.
Routine maintenance is crucial for the furnace's longevity and efficient operation. The manual emphasizes that untrained personnel (homeowners) should only clean and replace filters and replace fuses. All other operations, including installation, repair, and service, must be performed by a qualified installer, service agency, or the gas supplier.
An annual inspection by a qualified professional is recommended at the beginning of each heating season to ensure all components are in proper working order. This inspection includes checking:
Filter Maintenance is highlighted as the most common cause of inadequate heating or cooling performance. Filters are not supplied with the furnace but are installed externally by the installer. Users are advised to inspect filters monthly and clean (permanent) or replace (disposable) filters as required. When replacing, filters must be of the same type and size and rated for high airflow. For permanent filters, cold tap water and mild liquid detergent can be used for cleaning, followed by spraying both sides with a dust adhesive. If filters are badly torn or uncleanable, they must be replaced with equal size permanent, high velocity filters. The manual also provides a table of manufacturer-recommended high velocity filter sizes based on furnace cabinet width.
Replacement Parts are available through contractors or distributors, and when ordering, the furnace model and serial numbers (found on the warning label on the blower access panel) should be provided. Common spare parts include various cabinet parts (panels, door switch), electronics (transformer, PCB board, pressure switches, limit switches, capacitor), blower parts (motor, blower assembly), and heating parts (inducer, ignitor, burners, gas valve, flame sensor, heat exchanger assembly, rollout switch).
Safety Instructions are paramount throughout the manual, with warnings highlighted by a triangle against a grey background. These warnings address potential hazards such as fire, explosion, electrical shock, and carbon monoxide poisoning. Users are explicitly cautioned against storing or using flammable vapors near the appliance, attempting to light the burner manually, or using a flood-damaged furnace. In case of a gas smell, immediate evacuation and contacting the gas supplier or fire department are instructed. The manual also warns about the product containing chemicals like lead, which are known to cause cancer and birth defects, directing users to www.P65Warnings.ca.gov for more information. Adequate air for combustion and ventilation is essential, and air openings or spacing around the furnace must not be blocked.
General| Brand | Bosch |
|---|---|
| Model | BOSBGH96M100D5A |
| Category | Furnace |
| Fuel Type | Gas |
| AFUE | 96% |
| Heating Capacity | 100, 000 BTU |
| Motor Type | Variable Speed |
| Blower Motor | ECM |
| Vent Type | Direct Vent |
| Warranty | 10-year limited warranty |
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