A technician measures a return air temperature at the furnace of 70°F and a supply air temperature of 180°F on a furnace whose temperature rise is rated at 40 to 60°F. The technician should:
A) Leave it alone; it is working great.
B) Increase the airflow to reduce the temperature rise.
C) Increase the gas manifold pressure to reduce the temperature rise.
D) Decrease the airflow to reduce the temperature rise.
B
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