Setra Systems Flex User Manual

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Rough-in Installation
If live power is already turning on FLEX, power can be
removed from FLEX by removing the J3 jumper on the unit.
This can be done by hand (pictured below), or carefully
with non-conductive pliers. Normally, FLEX is continuously
powered and this jumper does not need to be accessed.
Universal Inputs (3) and Analog Input (1)
There are three (3) Universal Inputs (UI) on the FLEX main
unit, and one Analog Input (AI). The AI is used for the on-
board pressure sensor. If the factory-installed pressure
sensor is present, the AI is unavailable for other wired
sensors.The UI can be congured in software as either
Digital Inputs (DI) or AI.
Using the Universal Inputs as Analog Inputs
WhentheUIareconguredasAI, sensorsthatoutputa
voltage or milliamp (mA) signal can be used. Supported
signals are 0-5 V, 0-10 V, and 4-20 mA. These sensors can
be for temperature, relative humidity, CO2, lumens, etc.
Two 24 VDC excitation terminals are available on the UI
to power up to two pressure sensors or other desired
devices. One 24 VDC excitation terminal is available on the
AI (provided the on-board sensor is not present). These
terminals can source 90 mA maximum combined. They
are labeled “+24V” on the terminals. Connect this to the
positive excitation terminal of the desired sensor.
Using the Universal Inputs as Digital Inputs
Any of the UI terminals can be congured as DI, and
thenconguredaccordinglyinFLEXsetup screens.It is
common for a DI to be used as a door-open indicator, fan
status,pressureswitchacrosslter,ductstaticpressure
switch, or other type of dry contact. Normally-open (NO)
or Normally-closed (NC) states are supported.
WhentheDIisconguredfordoor-openindication,FLEX
will display a round door indicator on the home screen
(shown below).
Milliamp Loops Require Field-installed 250 Ohm Resistor
For 4-20 mA loops, it is required that a 250 ohm resistor
be eld-installed between the terminals labeled  UI/AI
and COM. FLEX will be measuring the voltage across this
resistor as 1-5 VDC corresponding to 4-20 mA.
Door open indicator

Setra Systems Flex Specifications

General

Brand	Setra Systems
Model	Flex
Category	Control Unit
Language	English