Ranco ETC-212000-000 Temperature Control

The Ranco ETC-212000-000 is an industrial-grade two-stage electronic temperature control engineered for precision in commercial refrigeration and HVAC systems. operating on 24V AC, this microprocessor-based controller provides a seamless digital replacement for outdated electromechanical switches. It features an expansive -30°F to 220°F temperature range and a user-adjustable 1°F to 30°F differential, allowing for tight control over complex staging requirements. The unit includes dual SPDT output relays, making it a versatile choice for managing multiple compressor stages, ventilation sequences, or dual heating and cooling applications. A high-visibility backlit LCD provides real-time sensor data and relay status at a glance, while the EEPROM memory ensures all programmed setpoints are retained during power loss. For high-traffic or rooftop installations, the keypad lockout switch prevents unauthorized parameter adjustments, maintaining system integrity. The included 8-foot thermistor sensor is rated for reliable performance and can be extended up to 400 feet for remote monitoring.

• Dual-Stage Versatility: Independent setpoints for Stage 1 and Stage 2 allow for overlapping heating/cooling or lead-lag compressor operation.
• Enhanced Equipment Protection: Integrated anti-short cycle compressor delay prevents rapid cycling, extending the life of high-dollar components.
• Remote Sensing Capability: Thermistor sensor can be relocated up to 400 feet away using standard 22 AWG wire without significant signal loss.
• Diagnostic Intelligence: Onboard software continuously monitors for sensor opens, shorts, and system errors, displaying specific fault codes for rapid troubleshooting.
• NEMA 1 Enclosure: Durable plastic housing designed for reliable indoor mounting in commercial mechanical rooms.

How do I resolve an "EP" error code on the display?
The "EP" code indicates a probe failure. first, inspect the sensor wiring for shorts or open circuits; if the wiring is intact and the ambient temperature is within the -30°F to 220°F range, the 1309007-044 thermistor likely requires replacement.

Can this unit control a heating stage and a cooling stage simultaneously?
Yes, the two stages are fully independent. You can program Stage 1 for cooling (C1) and Stage 2 for heating (H2), making it ideal for automatic changeover or climate-controlled storage applications.

What should I do if the keypad is unresponsive?
Ensure the internal lockout switch is in the "Unlock" position. This hardware switch is located inside the cover, approximately two inches from the bottom of the circuit board, and must be toggled to allow programming changes.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.