Kele UCS-221E 2-Stage Sequencer 24 Vac (2.25 x 1.19 x 2.25 in) UCS-221E

Product Description

The Kele UCS-221E is a 2-stage sequencer control module for HVAC systems that converts a voltage or current analog input into two SPDT relay outputs with adjustable setpoints and differentials. It accepts 0–20 mA or 0–15 VDC (jumper selectable), operates from 24 Vac ±10% (half-wave) or 24 Vdc ±10%, and provides LED relay status, snap-track mounting and screw-terminal connections. Relay contacts are rated 10 A @ 120 Vac and the unit may be daisy-chained for additional stages.

• Accepts 0–20 mA or 0–15 VDC input (jumper selectable) with 250 Ω (mA) and 49.7 kΩ (VDC) input impedance
• Two SPDT relay outputs with adjustable setpoints and factory-set differential (0.5 mA / 0.375 V) and 10 A @ 120 Vac rating
• 24 Vac ±10% or 24 Vdc ±10% power, LED relay status, snap-track mounting and screw-terminal wiring

Product Highlights

2-stage HVAC sequencer; 24 Vac/Vdc operation; 0–20 mA or 0–15 VDC input; two SPDT relays, 10 A rating; snap-track mount.

Product Information

Standard Information

• Brand: KELE
• Manufacturer Part Number: UCS-221E

Technical Specifications

• Brand: Kele
• MPN: UCS-221E
• Type: 2-stage electronic sequencer control module
• Application: HVAC sequencing, boiler/chiller sequencing, VAV control
• Supply Voltage: 24 Vac ±10% (half-wave) or 24 Vdc ±10%
• Supply Current: 100 mA @ 24 Vac; 50 mA @ 24 Vdc maximum
• Input Signal: Analog (0–20 mA or 0–15 VDC, jumper selectable)
• Input Range: 0–20 mA or 0–15 VDC (jumper selectable)
• Input Impedance: 250 Ω (mA input); 49.7 kΩ (VDC input)
• Accuracy: ±1%
• Output: Two SPDT relays, adjustable via setpoint potentiometers
• Relay Differential: Factory set at 0.5 mA or 0.375 V; adjustable using plug-in resistors
• Relay Output Rating: 10 A @ 120 Vac
• Wiring Terminations: Screw terminals
• Mounting Type: Snap-track
• Display: LED (relay status indication)
• Dimensions: 2.25 x 1.19 x 2.25 in
• Weight: 0.4 lb (0.18 kg)
• Operating Temperature: 32° to 158° F (0° to 70° C)
• Operating Humidity: 5% to 95% RH (non-condensing)
• Approvals: RoHS