Fan motor
Also known as: fan, axial fan motor
Short definitionThe motor that turns the propeller of an evaporator or condenser. The airflow through the unit, its noise and part of its electricity use depend on how this component is chosen.
With no air moving between the fins, even the largest coil is useless; the fan motor is what drives that air. Cold room units almost always use propeller (axial) fans with the motor built into the hub, so the passing air cools it as well. Small fans need 230 V single-phase, large ones 400 V three-phase. Enclosure protection is usually IP54.
In a load calculation the power of the evaporator fans is entered as heat entering the room, because the electricity they use turns into heat inside. Three 200 W fans running non-stop add up to 14.4 kWh a day. A fan for sub-zero duty needs bearings and grease rated for −40 °C. After a replacement, check the blowing direction; a three-phase motor wired in reverse still spins but hardly pushes any air.