Manufacturer of electronic temperature controllers, pressure switches, and refrigeration controls for commercial HVAC applications.
Ranco is a trusted name in the HVAC and refrigeration industry, providing robust control solutions for commercial and industrial applications.
The brand is best known for its Electronic Temperature Controls (ETC series), pressure switches, and temperature regulation devices designed to ensure the efficiency and safety of heating, cooling, and ventilation systems. Ranco products feature microprocessor-based accuracy and durable construction, often including NEMA-rated enclosures suitable for harsh environments like agricultural buildings and outdoor units.
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To switch between Fahrenheit and Celsius, press the SET key once to access the scale mode. The display will show the current status (F or C). Use the up or down arrow keys to toggle the selection.
An E1 error message typically appears if the up or down key is pressed when the unit is not in programming mode. If the message appears constantly without any keys being pressed, the control may need replacement.
For manual reset controls (such as the O16 series), the system pressure must return to a safe operating range before the device can be reset. For low-pressure controls, pressure must rise approximately 10 PSIG above the cut-out setting; for high-pressure controls, it must drop approximately 40 PSIG below the cut-out setting.
The E2 error indicates that control settings are not properly stored in the memory. To correct this, check all programming settings and save them again consistent with your application requirements.
Many Ranco ETC models, such as those with NEMA Type 4X enclosures, are rated watertight and are suitable for outdoor use or high-moisture environments like agricultural buildings.