Скачать или смотреть Heat Exchanger Cooldown: Fan Limit Calibration and Plenum Temperature Check

A proper furnace cool down prevents heat exchanger damage and prolongs equipment life by ensuring the blower runs after the burner shuts off until the exchanger reaches a safe temperature. Learn fan limit control calibration, fan runon settings, plenum temperature checks, and troubleshooting for miscalibrated switches, clogged filters, weak blower motors and failing capacitors. This guide covers how to test and adjust the fan limit control, measure plenum temperature with a handheld thermometer, confirm electronic control set points, replace sensors, clean and lubricate the blower, and measure static pressure to restore proper airflow. Homeowners and HVAC technicians searching for furnace maintenance, furnace safety, heat exchanger cooling, safe cycling design, and HVAC troubleshooting will find practical steps to improve furnace performance and avoid costly heat exchanger repairs.

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furnace cooldown, fan limit control, heat exchanger safety, plenum temperature check, HVAC troubleshooting, blower motor maintenance, furnace fan runon, static pressure testing, filter replacement, heat exchanger protection