Planned Service
A service technician should check the following items dur- ing an annual inspection. Power to the unit must be shut off for 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, cracked 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.
Instruct the homeowners to pay attention to their furnace. Situations can arise between annual furnace in- spections 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 carbon monoxide gas.
Page 55
