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Defines WARNING and CAUTION signal words used for hazards.
Lists 9 critical safety practices for installation and operation.
Steps to prevent CO poisoning during appliance operation.
Details 8 essential requirements for furnace placement and clearances.
Lists situations and chemicals mandating outdoor air for combustion.
Emphasizes proper venting for safety and efficiency, covering CO hazards.
Details requirements for Category IV furnaces and direct/nondirect vent systems.
Mandates CO detector installation for horizontally vented appliances in MA.
Covers piping arrangements, codes, shut-off valves, and drip legs.
Details steps for checking gas flow and input rate.
Explains how to derate furnaces for high altitudes and check input rates.
Details the process of burner ignition, flame sensing, and gas valve operation.
Explains how to check the operation of the limit switch.
Discusses issues like excessive pressure, flame loss, and power failure.
Covers inducer failure, condensate drain blockage, and system lockout resets.
Lists and explains various error flash codes from the furnace control module.
General