Description
The Lennox 21W89 Transformer/Relay is an essential part of different Lennox HVAC equipment. This transformer regulates voltage levels in the HVAC system such that it provides an appropriate power supply to the required components. For example, it can decrease the incoming line voltage to the level that can be used in control circuits. The relay component, before it can be used as an electrical switch, helps dictate the flow of current to different parts of the electric system depending on the signal it receives from the thermostat or control board. When the thermostat feels a temperature change and sends a signal, the relay switches on or off the equipment to get the right temperature.
