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Alerts to risks of carbon monoxide poisoning from improper venting of gas appliances.
Warns about potential fire or explosion risks due to improper handling or servicing.
Advises against using the furnace as a construction heater to prevent premature damage.
Prohibits installation in corrosive or contaminated environments to prevent damage.
States furnaces are not approved for mobile housing, trailers, or RVs, warning of damage or injury.
Instructs against direct installation on carpeting or tile; requires subbase for downflow applications.
Details required clearances from furnace to combustible materials for various installation types.
Specifies clearances for downflow, horizontal closet, and alcove installations to combustibles.
Warns against direct installation on combustible flooring; requires subbase for vertical downflow applications.
Defines confined spaces and outlines air supply requirements for combustion and ventilation.
Lists substances in air supply that necessitate outdoor air for combustion.
Specifies the minimum air entering temperature for the furnace.
Advises remote filter installation for horizontal applications to prevent damage or injury.
Instructs to turn off power before servicing filters to prevent injury from moving parts.
Details the process of installing the filter rack in the bottom of the furnace.
Provides instructions for relocating the filter rack for side return air on upflow furnaces.
Explains how to remove the blower door or hinge for clearance or other issues.
Describes installing alternate filter clips or brackets for upflow furnaces.
Prohibits venting into unlined masonry or concrete chimneys due to safety risks.
Details requirements for venting into lined internal masonry chimneys, including common venting.
Emphasizes thorough inspection of chimney liners for cracks to prevent leaks and deterioration.
Highlights the necessity of proper electrical grounding for safety and to prevent shock or fire.
Warns that the integrated furnace control is polarity sensitive and requires correct hot leg connection.
Instructs to disconnect electrical power before servicing to prevent shock or injury.
Provides wiring diagrams for single-stage and two-stage heating thermostats, including installation notes.
Explains how to connect an optional humidistat and modify factory jumpers.
Reiterates the danger of using open flames for gas leak detection and storing flammables nearby.
Advises using a backup wrench during gas piping installation to protect the gas valve.
Complies with California law, warning about exposure to fuel substances and combustion by-products.
Details the procedure for adjusting manifold pressure on the White-Rodgers 36E gas valve model.
Details the procedure for adjusting manifold pressure on the White-Rodgers 36G gas valve model.
Warns to replace/tighten all plugs and leak check fittings after adjusting gas pressure.
Provides guidance on selecting orifices for altitude adjustments and checking input rates.
Lists essential checks to perform before initiating the startup sequence.
Directs users to unit-specific instructions and outlines the initial checkout process.
Describes the operation sequence for 2-stage heating based on thermostat signals.
Outlines the operation sequence when using a 1-stage thermostat.
Explains blower operation when the thermostat fan switch is set to 'ON'.
Details how to test the limit switch for proper operation and overheating shut-off.
Explains how the Integrated Furnace Control manages blower timing for heating and cooling.
Guides on setting the thermostat's heat anticipator based on measured current flow.
Covers issues like excessive pressure, loss of flame, power failure, gas supply loss, and inducer failure.
Details procedures for system lockout and manual reset after errors.
Warns about fiberglass insulation causing cancer and respiratory irritation, with precautionary measures.
Provides emergency steps to take if gas is detected, emphasizing safety.
Indicates normal system status: no heat call (slow flash) or call for heat (fast flash).
Covers errors like IFC failure, power issues, lockout, pressure errors, limit circuits, flame sense, gas valve, and low flame signal.
This document serves as an installer's guide for variable speed, two-stage, gas-fired furnaces, specifically designed for upflow/horizontal and downflow/horizontal configurations, featuring a "Fan Assisted Combustion System." It provides comprehensive instructions for installation, start-up, adjustment, and maintenance, ensuring safe and efficient operation.
The furnaces described are fan-assisted combustion system, Category I gas-fired units. They are designed to provide heating for residential and light commercial applications. The two-stage operation allows for modulated heating, offering improved comfort and energy efficiency by adjusting the heat output based on demand. The variable speed blower motor further enhances comfort by providing consistent airflow and quiet operation. These furnaces are capable of operating with either natural gas or LP gas, with specific adjustments required for each fuel type and for installations at high altitudes. The integrated furnace control (IFC) manages the sequence of operation, including ignition, flame sensing, and blower control, ensuring safe and reliable performance. Safety features such as limit switches and pressure switches are incorporated to prevent overheating and ensure proper venting.
The guide details various installation configurations, including upflow, downflow, and horizontal orientations. For upflow installations, the furnace can be installed with a cased coil placed on top, and filter racks are factory supplied for bottom or side return air inlets. Horizontal installations allow for placement in attics or crawl spaces, with specific requirements for support and clearances. Downflow furnaces require a subbase for combustible flooring, unless a cased coil is installed vertically. The return air filter system is designed for flexibility, allowing filters to be located within the blower compartment for upflow models or externally for horizontal and downflow applications. The blower door is hinged for easy filter replacement and maintenance access.
The two-stage heating operation is controlled by a thermostat. A single-stage thermostat will initiate a 10-minute delay before the second stage engages, while a two-stage thermostat directly controls both stages. The variable speed blower motor provides quiet and efficient air delivery, with adjustable fan-off delays for both heating and cooling cycles. An "Enhanced Mode" is available for cooling, which ramps up and down the blower speed to improve comfort, quietness, and energy savings. This mode is particularly beneficial for dehumidification. The guide also covers the necessary adjustments for manifold pressure and orifices, which are critical for optimizing performance based on fuel type and altitude.
The guide emphasizes several maintenance-related aspects to ensure the longevity and safe operation of the furnace. Regular inspection of the venting system is crucial to check for proper size, pitch, blockages, restrictions, leakage, or corrosion. Filters are a key maintenance item, and the guide provides detailed instructions on their installation, removal, and replacement. It highlights the importance of using high-velocity type air filters and specifies that filters should not be installed directly above the furnace in horizontal applications to prevent property damage or injury. The blower door is designed for easy removal and tilting, facilitating access for filter changes and internal inspections.
Safety checks are paramount, including testing for gas leaks with a soap solution (never an open flame) and verifying the proper operation of the limit switch. The limit switch check involves intentionally restricting airflow to ensure the burners shut off when the furnace reaches its maximum outlet temperature. The guide also provides instructions for resetting the integrated control module after a lockout condition. For installations in residential garages, the furnace must be located to avoid physical damage from vehicles. The document also includes warnings about carbon monoxide poisoning and the importance of proper combustion and ventilation air supply. It advises against using the furnace as a "Construction Heater" during the finishing phases of construction to prevent corrosive conditions that could damage the heat exchanger. The guide also recommends that homeowners be instructed on how to shut off the gas supply and electrical power in case of a malfunction and to contact a qualified service agency for repairs.
General