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For Johnson Controls Applications

Description: 6-STAGE SEQUENCER
Category: Electrical Controls



The Model UCS-621 is a solid-state device used for
multi-stage control in HVAC systems, sequencing boilers
or chillers, or floating control of VAV boxes from a
single analog signal. The UCS-621 can be used to
obtain a digital output from a voltage or current producing
sensor. The UCS-621 is supplied with mounting
track for easy installation.

• 6 stages of relay control
• Voltage or current input
• 24 VAC or 24 VDC power
• LED indication of relay status
• Adjustable relay setpoints
• Adjustable relay differentials
• Snap-track mounted


The UCS-621 accepts a 0.5-20 mA or 0.375-15 VDC
signal to produce up to six stages of relay output. Each
relay has a multi-turn potentiometer adjustment to set
the pull-in point. Each of the six relays is jumper-selectable
to pull in on either a rise or fall in signal. Individual
relay differential is easily adjusted by using different
value plug-in differential resistors. The UCS-621 considers
an input signal below 0.5 mA or 0.375 V to be a loss
of signal and all relays will de-energize.

Replaces Part Numbers: UCS-621, CARUCS-621

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