Robertshaw 803A Cooling Stat 321042-401 and aeration equipment

and aeration equipment

or the system failing to modulate water temperature despite dropping outdoor temperatures

or an inability to sustain the second heating stage

preventing premature dielectric breakdown

Robertshaw 803A Cooling Stat 321042-401 and aeration equipmentThe Robertshaw 803A is a commercial grade line voltage cooling thermostat engineered for high performance temperature regulation in single pole applications. This SPST cooling thermostat is the direct field replacement for the legacy 803 model, featuring a bimetal sensing element for rapid thermal response without the need for mercury. Designed for versatile HVAC line voltage control, it supports 120V, 240V, and 277V AC circuits, making it a standard