Before installing the York S1-7945-3551

all manufactured to original factory specifications

providing precise burner management

the 78H55 is the updated manufacturer part number that replaces the older 78H5501 while maintaining the same 120V to 24V conversion ratio and mounting specs

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

Warrick 16DMM1M0 Load Contact Freon Before installing the York S1-7945-3551The 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