The UCS-221E Control Module is a high-precision electro-pneumatic sequencer designed to interface electronic controllers with pneumatic actuators and mechanical equipment. As the direct UCS-221 replacement, this module provides seamless two-stage relay control for HVAC and industrial process systems. The unit operates on a 24 VAC/VDC supply voltage and features jumper-selectable 0-20 mA or 0-15 VDC input signals, ensuring compatibility with a wide range of building automation systems. Integration is streamlined via standard screw terminals and a snap-track mounting base. Each of the two SPDT relays is rated for 10A at 120 VAC, featuring adjustable setpoints and field-configurable differentials. With a high input impedance (250 ? for mA, 49.7 k? for VDC) and an operating accuracy of ?1%, the UCS-221E sequencer delivers reliable performance in demanding environments from 32? to 158?F. Onboard LED indication provides instant diagnostic status for each relay stage, reducing troubleshooting time for field technicians. Key Benefits for Contractors: Universal Input Compatibility: Field-selectable jumpers allow the module to accept either 0-20 mA or 0-15 VDC signals without additional converters. Precise Stage Management: Dual SPDT relays provide independent control of two distinct stages with adjustable setpoints and differentials via plug-in resistors. Simplified Installation: The compact footprint and included snap-track allow for quick mounting inside control cabinets and panels. Enhanced Diagnostics: High-visibility LEDs confirm relay activation at a glance, facilitating faster system commissioning. Legacy Support: Specifically engineered as a drop-in UCS-221 replacement, minimizing downtime during system retrofits. Common Questions Regarding the UCS-221E: Can I use this module with a 24V DC power supply? Yes, the UCS-221E is designed for dual-power compatibility, accepting 24 VAC (half-wave) or 24 VDC supply voltage. How do I adjust the relay differential? The differential is factory-set at 0.5 mA or 0.375 V but can be customized in the field using specific plug-in resistors to match unique system requirements. Is this unit suitable for high-humidity environments? The module is rated for operation in 5% to 95% relative humidity, provided the environment is non-condensing. 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.
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