UCS-621E Control Module

Upgrade your system’s response profile with the UCS-621E Sequencer Control Module, a solid-state powerhouse designed for high-precision multistage HVAC control. This veteran-grade six-stage sequencer functions as a direct replacement for the legacy UCS-621, offering seamless integration into existing building automation systems (BAS). Built to handle a dual 24 VAC/VDC supply voltage, the module accepts a wide-range 0-20 mA or 0-15 VDC input signal, making it highly adaptable for sequencing boilers, chillers, or electric heat stages. Each of its six SPDT relays is rated for 10A at 120 VAC, ensuring robust switching capacity for commercial loads. With adjustable relay setpoints and differentials, technicians can fine-tune staging to prevent short-cycling and optimize energy efficiency. The unit’s snap-track mounting and clear LED status indicators simplify field installation, while the ability to daisy-chain modules allows for scalable control beyond six stages. Rely on this electronic sequencer for stable, repeatable performance in demanding industrial environments.

• Precise Multistage Management: Efficiently sequences up to six stages of cooling, heating, or airflow to maintain tight environmental tolerances.
• Universal Input Compatibility: Field-selectable jumpers allow for easy switching between 0-20 mA and 0-15 VDC analog signals without additional converters.
• Robust Solid-State Design: Engineered for reliability within a broad 32° to 158°F operating temperature range, ideal for mechanical rooms.
• Direct Retrofit Capability: Serves as a direct replacement for UCS-621, ensuring zero-footprint changes during control upgrades.
• Customizable Staging: On-board potentiometers and plug-in resistors allow for precise adjustment of relay setpoints and differentials.

How do I configure the input signal for the UCS-621E?
The module features internal jumpers that let you select between current (0-20 mA) and voltage (0-15 VDC) inputs. Always ensure power is disconnected before adjusting jumper positions to protect the electronic control module.

Can I add more than six stages to my system?
Yes, these modules are designed to be daisy-chained. By linking multiple units, you can expand your sequencing control to accommodate large-scale boiler plants or complex VAV applications.

What are the power requirements for this sequencer?
The UCS-621E operates on a nominal 24 VAC or 24 VDC supply. For maximum stability and to reduce EMI interference, use 18 AWG stranded copper wiring and ensure a clean, dedicated power source.

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.