Planned Service
You should expect a service technician to check the follow- ing items during an annual inspection. Power to the unit must be shut off for the service technician’s safety.
Fresh air grilles and louvers (on the unit and in the room where the furnace is installed) - Must be open and unob- structed to provide combustion air.
Burners - Must be inspected for rust, dirt, or signs of water.
Vent pipe - Must be inspected for signs of water, damaged or sagging pipe, or disconnected joints.
Unit appearance - Must be inspected for rust, dirt, signs of water, burnt or damaged wires, or components.
Blower access door - Must be properly in place and pro- vide a seal between the return air and the room where the furnace is installed.
Return air duct - Must be properly attached and provide an air seal to the unit.
Operating performance - Unit must be observed during operation to monitor proper performance of the unit and the vent system.
Combustion gases - Flue products must be analyzed and compared to the unit specifications.
Problems detected during the inspection may make it nec- essary to temporarily shut down the furnace until the items can be repaired or replaced.
Pay attention to your furnace. Situations can arise be- tween annual furnace inspections that may result in unsafe operation. For instance, items innocently stored next to the furnace may obstruct the combustion air supply. This could cause incomplete combustion and the production of car- bon monoxide gas.
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