Specifications

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TRANSDUCERS
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WHEN YOU NEED IT RIGHT, RIGHT NOW, CALL KELE.
kele.com888-397-5353 USA
March 2014
Supply Voltage 24 VAC ±10%, half-wave;
or 24 VDC ±10%
Supply Current 100 mA @ 24 VAC; 50 mA @
24 VDC maximum
Input 0-20 mA or 0-15 VDC, jumper
selectable
Input Impedance 250Ω (mA input); 49.7 kΩ
(VDC input)
Wiring Terminations Screw terminals
Accuracy ±1%
Output Two SPDT relays, adjustable via
setpoint potentiometers
Relay Differential Factory set at 0.5 mA or 0.375V,
adjustable using plug-in resistors
Relay Output Rating 10A @ 120 VAC
Operating Temperature 32° to 158°F (0° to 70°C)
Operating Humidity 5% to 95% RH (non-condensing)
Weight 0.4 lb (0.18 kg)
RoHS Statement Ye s
Warranty 1 year
SEQUENCER CONTROL MODULE - TWO STAGE
UCS-221E
DESCRIPTION
The UCS-221E is a solid-state device used for multistage
control in HVAC systems, sequencing boilers or chillers, or
floating/tri-state control of VAV boxes from a single analog
signal. The UCS-221E can be used to obtain a digital output
from a voltage or current producing sensor. Units may be
daisy chained to provide additional stages of control, and a
mounting track is supplied for easy installation.
OPERATION
The UCS-221E accepts a 0-20 mA or 0-15V input signal to
produce a two-stage relay output. Each relay has a multi-
turn potentiometer adjustment to set the pull-in point. Relay
1 can be jumper-selected to pull in on either a rise or fall in
signal. Relay 2 always pulls in on a signal rise. Individual relay
differential is easily adjusted by using different value plug-
in differential resistors. Multiple UCS models can be daisy
chained to operate additional stages from one input signal.
A maximum of eight slave units can be daisy chained.
SPECIFICATIONS
2.25
(5.72)
2.25
(5.72)
1 2
24 V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
1
SEQ
CH
V
MA
FLT
2
Depth: 1.19
(3.02)
in
(cm)
FEATURES
• Two stages of relay control
• Voltage or current input
• LED indication of relay status
• Adjustable relay setpoints
• Adjustable relay differentials
• Snap-track mounted
DIMENSIONS