Microprocessor Controller for MUA
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Appendix C: Space Thermostat Quick Start
Initial Setup and Communication Configuration
The space thermostat is a Modbus connected device. Up to three additional Modbus sensors can be added for
space temperature or space temperature and humidity averaging. The sensors must all be connected in a daisy
chain configuration.
The microprocessor controller will be pre-configured for one space thermostat. If space temperature averaging is
desired, additional field setup will be required both in the controller and on the Modbus space sensors:
• Each space sensor must have the DIP switches adjusted on the back of the sensor
to the corresponding switches. Reference Space Thermostat Modbus Address
chart on the following page for DIP switches settings.
• Once the address is set and the wires are connected the “Status” LED should be a
steady green and the “Network” LED should be a quick blinking amber/green color.
• To add additional sensors in the field, enter the Ctrl Variables Menu/Temperature
and scroll down in the Temperature Menu to select Space Thermostat. Choose the
number of space sensor being used (1-4).
The space thermostat gives users the ability to view the space temperature
and relative humidity (optional) and control the active space setpoints from
the adjustable display. The space thermostat also has the ability to send
the unit into temporary occupied mode. Up to four space thermostats can
be wired back to the microprocessor to provide an average for the space
temperature and humidity (optional). The space thermostat is shipped loose
with installation by others and is a Modbus connected device.
Space thermostat functions:
• Temporary occupancy override control
• Temperature and relative humidity monitoring
• Temperature and relative humidity setpoint adjustability
• Status icon on LCD display with push buttons
Display
If more than one space thermostat is provided for
averaging, only one space thermostat will be provided
with a display and push buttons for adjustment.
Adjusting Setpoint
- The default display will show the
current temperature value for the space. Use the scroll
button to index through additional sensor parameters.
Parameters with the SETPOINT icon displayed above
the temperature display are adjustable. Use the Up/
Down buttons to adjust the setpoint, and use the scroll
button to view the next parameter or return to the
normal display mode.
Up/Down Button Function
- The Up/Down buttons
are used to adjust editable parameters including the
temperature and humidity setpoint.
Override Button Function
- The display shows a person in the lower left corner of the display at all times. If the
person is solid, the unit is operating in occupied mode. If it is an outline of the person, the unit is in unoccupied
mode. Pushing the Override button when the unit is in unoccupied mode temporarily overrides the sequence to
Occupied mode for a period of 1 to 4 hours (adjustable at the unit microprocessor).
