Rev 3.1 01/11/23 - 3 - Model 600 User Guide
2.2 Powering the System
The Model 600 has three sources for powering the system. All three can be used simultaneously to provide
redundancy to the system. The Model 600 gets 24VAC power from each HVAC system being controlled when
the R (24vac hot) and C (24VAC common) terminals are connected to the system. The system monitors the
presence of the 24VAC voltage from the HVAC unit to determine if power is lost, requiring a switch of the lead
HVAC system. Additionally, there is a separate 18-65 VDC input on the upper left corner of the IO board for
connection to the facilities DC plant. The DC power takes precedence over the power from the HVAC systems,
but if any source should fail, the system will switch seamlessly to the next available source and continue to
operate. The system monitors the presence of the 24VAC voltage from the HVAC unit to determine if power is
lost, requiring a switch of the lead HVAC system.
2.3 Wiring Inputs and Outputs
See Figure 2- Model 600 Wiring Diagram for wiring the monitoring and control points for your application.
Temperature sensors are thermistor devices and are not polarity sensitive. For the Humidity sensor, make sure
you wire the power and input terminals to the appropriate terminals. Follow the directions that come with the
sensor. The alarm outputs are energized under normal condition and de-energize when an alarm occurs. The
diagram shows the outputs in their “normal” or non-alarm condition.
Monitoring inputs for HVAC fail, econ on, generator running, hydrogen gas and smoke detector are wired
between their respective input and common terminal. The points are defined through the system setup and/or
alarm setup (depending on input) for normally open or normally closed operation. The default is “disabled” and
must be changed if the points are wired and are being used.
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