TEC3000 Series Networked and Wireless Proportional Fan Coil and Individual Zone Thermostat Controllers with
Dehumidification Capability Installation Guide
25
To set the Equipment Size parameter:
1. Press the Menu icon.
2. Press Control Setup.
3. Press Tuning.
4. Use the up and down arrows to navigate to Equipment Size.
5. Press Equipment Setup and select Oversized.
6. Press Save and the back arrow
to return to the previous screen.
Changeover
Pressure-Dependent VAV systems and two-pipe fan coils require changeover detection in order to switch seasonal
operation between heating and cooling modes. The TEC supports the following methods for changeover:
automatic changeover using an analog sensor (thermistor), automatic changeover using a binary switch, or remote
changeover from a BAS and manual changeover.
For automatic changeover, a supply temperature sensor or switch must be connected to the Changeover Sensor
(COS) input of the TEC. Changeover Mode must be set to Auto, and Supply Temp Type must be set for Analog
Sensor, Cooling N.C. (cooling when switch is closed), or Heating N.C. (heating when switch is closed). When an
analog sensor is used, the changeover setpoint can be adjusted. The changeover logic applies a 10-degree
Fahrenheit differential to the setpoint. The system switches to cooling mode when the temperature drops below the
changeover setpoint and remains in cooling mode until the measured temperature has risen 10 degrees above the
changeover setpoint.
To configure automatic changeover:
1. Press the Menu icon.
2. Press Setup.
3. Press Equipment Setup.
4. Press Changeover.
5. Press Changeover Mode and select Auto.
6. Press Supply Temp Type and select Analog Sensor, Cooling N.C., or Heating N.C.
7. If using an Analog Supply Temp Sensor, press Supply Temp Type and adjust accordingly.
8. Press
Save and the back arrow to return to the previous screen.
Additionally, the thermostat controller supports manual changeover. To configure manual changeover:
1. Press the Menu icon.
2. Press Setup.
3. Press Equipment Setup.
4. Press Changeover.
5. Press Changeover Mode and select Heating or Cooling.
6. Press Save and the back arrow
to return to the previous screen.
You need to ensure that the Supply Temp type is set to Analog Sensor. The Changeover Mode is also exposed to
the BAS through the CGOVR-MODE and can be commanded from the BAS.
On two-pipe or VAV systems without an automatic changeover, or on four-pipe systems, you can use RSEN or
COS as a monitor-only point for reading an analog sensor. By setting the controller in four-pipe mode, or selecting
Heating or Cooling for Changeover Mode, the controller defaults to monitor-only mode for RSEN or COS and
exposes the value to the network as the supply temperature.
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