The change is a manufacturer update to the SKU

it ensures a secure fit for the included fan blade

Upon inspection

providing precise burner management

These should be replaced any time the header is removed for heat exchanger cleaning

Warrick 16DMM1M0 Load Contact Freon The change is a manufacturerThe Warrick 16DMM1M0 is a high performance liquid level control module engineered for demanding industrial and HVACR environments. This 120V inverse acting control is specifically designed to manage single level or differential service applications without the need for additional slave relays, thanks to its integrated DPDT load contact configuration. With a factory set 26K ohm sensitivity, this solid state control provides precise conductivity