Microprocessor Controller for DOAS
38
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Appendix: Room Thermostat Quick Start
Initial Setup and Communication Configuration
The room thermostat is a Modbus connected device There can be up to three additional Modbus temperature
sensors added for room temperature averaging. The sensors must all be connected in a daisy chain configuration.
The microprocessor controller will be pre-configured for one room thermostat. If room temperature averaging is
desired, additional field setup will be required both in the controller and on the Modbus room sensors:
•
Each room sensor must have the DIP switches adjusted on the back of the sensor
to the corresponding switches. Reference Room 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.
•
In the Controller, enter the Ctrl Variables Menu/Temperature and scroll down in the
Temperature Menu to select BAPI Modbus Stat. Choose the number of room sensor
being used (1-4).
The room thermostat gives users the ability to view the room temperature
and relative humidity (optional) and control the active room set points from
the adjustable display. The room thermostat also has the ability to send
the unit into temporary occupied mode. It is also provides the functionality
to average up to 4 temperature readings through the microprocessor. The
room thermostat is shipped loose with installation by others and is a Modbus
connected device.
Room thermostat functions:
• Temporary occupancy override control
• Temperature and relative humidity monitoring
• Temperature and relative humidity set point adjustability
• Status icon on LCD display with push buttons
• Optional temperature monitoring up to 4 sensors
Display
If more than one room thermostat is provided for
averaging, only one room thermostat will be provided
with a display and push buttons for adjustment.
Adjusting SET POINT
- The default display will
show the current temperature value for the room. Use
the scroll button to index through additional sensor
parameters. Parameters with the "SET POINT"
icon displayed above the temperature display are
adjustable. Use the Up/Down buttons to adjust the
set point, 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 set point.
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 will allow a temporary override sequence to
Occupied mode for a period of 1 to 3 hours (adjustable at the unit microprocessor).
