SCHNEIDER ELECTRIC TC300 Thermostat
Features
- Modern appearance
- Large, blue backlit, LCD screen
- Eco button for energy saving
- Real-time display
- Button lockout function controls the unauthorized operation
- Non-volatile memory (EEPROM) retains user settings during power loss
- Low-temperature protection
- Standard 86×86 mm box for installation
- Alert function facilitates temperature sensor maintenance
- Optional Modbus communication
- Deluxe models include:
- Sleep mode for energy savings
- Occupancy/card key input
- Optional remote temperature sensor
Product Description
The TC300 Series fan coil thermostats are optimized for office building, hotel and residential applications. The TC300 Series can be used for 2-pipe or 4-pipe applications. Their simple design makes them suitable for any contemporary building. They are both easy to operate and install.
The TC300 features microprocessor-based control and a large backlit LCD screen. The LCD display modes include operation status (cooling, heating, and ventilation), fan speed, room temperature, and set-point.
Available Products
| Part Number | Description | Application | Comm. | Real-Time |
| TC303-3A2L | FCU Thermostat for 2-position on/off actuator (2-wire) | 2-pipe | None | No |
| TC303-3A4L | FCU Thermostat for 2-position on/off actuator (2-wire) | 4-pipe* | None | No |
| TC303-3A2LM | FCU Thermostat for 2-position on/off actuator (2-wire) | 2-pipe | Modbus | No |
| TC303-3A4LM | FCU Thermostat for 2-position on/off actuator (2-wire) | 4-pipe* | Modbus | No |
| TC303-3A2DLS | Deluxe FCU Thermostat for 2-position on/off actuator (2-wire) | 2-pipe | None | Yes |
| TC303-3A4DLS | Deluxe FCU Thermostat for 2-position on/off actuator (2-wire) | 4-pipe* | None | Yes |
| TC303-3A2DLMS | Deluxe FCU Thermostat for 2-position on/off actuator (2-wire) | 2-pipe | Modbus | Yes |
| TC303-3A4DLMS | Deluxe FCU Thermostat for 2-position on/off actuator (2-wire) | 4-pipe* | Modbus | Yes |
| IR-300 | TC3xx Infrared Remote Control** | |||
| RS-03 | 10 kΩ NTC Remote Sensor – 3 m (10 pcs)** | |||
* Can be changed from 4-pipe system with 2-wire motorized valve, to 2-pipe system with 3-wire motorized valve.
** For use with deluxe models only
Specifications
| Sensing element | 10 kΩ NTC (3950) |
| Accuracy | ±1 °C |
| Set-point range | 5 … 35 °C |
| Display range | 0 … 50 °C (shown in 0.5 °C increments) |
| Operating temperature | 0 … 45 °C |
| Operating humidity | 5 … 95 %RH (non-condensing) |
| Power requirement | < 1 W |
| Power supply | 85 … 260 Vac, 50/60 Hz |
| Terminals | Can be connected to 2 x 1.5 mm2 or 1 x 2.5 mm2 conductors |
| Switch current rating | 5 A resistive, 3 A inductive @ 230 Vac |
| Switch power rating | Max. inrush 1385 VA / 150 W |
| Protection class | IP30 |
| Housing | Flame-retardant PC |
| Dimensions | 88.5 x 86 x 16 mm (3.48” x 3.38” x 0.63”) |
| Hole pitch | 60 mm (standard) |
Precautions
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
- Follow safe electrical work practices. See NFPA 70E in the USA, CSA Z462 in Canada, or applicable local codes.
- Read and understand the instructions before installing the product. Follow the instructions during installation.
- Installation, wiring, testing or service must be performed only by qualified persons in accordance with all applicable codes and regulations.
- Do not use the product for life or safety applications.
- Do not install the product in hazardous or classified locations.
- Do not exceed the product’s ratings or maximum limits.
- The product may use multiple voltage/power sources.
- Turn off ALL power-supplying equipment before working on or inside the equipment.
- Use a properly rated voltage-sensing device to confirm that all power is off.
- Do NOT depend on the product for voltage indication.
- Products rated only for basic insulation must be installed on insulated conductors.
- Current transformer secondaries (current mode) must be shorted or connected to a burden at all times.
- Remove all wire scraps and tools, replace all doors, covers and protective devices before powering the equipment.
- Failure to follow these instructions will result in death or serious injury.
A qualified person is one who has skills and knowledge related to the construction and operation of this electrical equipment and installations, and has received safety training to recognize and avoid the hazards involved. NEC Article 100
If this product is used in a manner not specified by the manufacturer, the protection provided by the product may be impaired. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.
Control system design must consider the potential failure modes of control paths and, for certain critical control functions, provide a means to acheive a safe state during and after a path failure. Examples of critical control functions are emergency stop and over-travel stop.
WARNING
LOSS OF CONTROL
- Assure that the system will reach a safe state during and after a control path failure.
- Separate or redundant control paths must be provided for critical control functions.
- Test the effect of transmission delays or failures of communication links.1
- Each implementation of equipment using communication links must be individually and thoroughly tested for proper operation before placing it in service.
Failure to follow these instructions may cause injury, death or equipment damage.
1For additional information about anticipated transmission delays or failures of the link, refer to NEMA ICS 1.1 (latest edition). Safety Guidelines for the Application, Installation, and Maintenance of
Solid-State Controls or its equivalent in your specific country, language, and/or location
.Note: Loss of control warning applies to Modbus models only.
Dimensions mm (in.)
Functions
- Set-point Adjustment – The set-point buttons allows users to adjust the set-point (in 0.5 °C increments) for the space.
- Fan Speed – Users can select fan speed (High, Medium, Low and Automatic) by pressing the Power/Fan button.
- Mode Control – Users can switch operating modes (Heating, Cooling, or Ventilation) by pressing the mode button.
- Eco Saving Mode – Pressing the Eco button starts the energy savings mode. In cooling mode, the set-point is automatically adjusted to 26 °C and the fan speed is set to Low. In heating mode, the set-point is automatically adjusted to 18 °C and the fan speed is set to Low. The user can exit the energy saving by pressing the Eco button.
- Button Lockout Function – Allows the buttons to be deactivated to prevent thermostat operation by others.
- Low Temperature Protection – If the room temperature drops below 5 °C, the thermostat will start automatically and the fan speed will be set to high. Once the temperature reaches 7 °C, the thermostat will switch off the output.
- Alert – In the event of an operating exception, the thermostat will attempt to command the valve to close and place the device in an inoperative state. The display will indicate the current status with one of four diagnostic messages.
Installation Guidelines
- Install the thermostat about 1.5 m (59”) above the floor
- Make sure the device is powered off prior to installation/service
- Do not install in locations that can be affected by radiant heat or in places with high levels of sunlight
- Do not install thermostats behind doors or in corners
- Protect from water/debris to avoid damaging the thermostat
Operation Instructions
- Power on/off: Press and hold
button for two seconds to turn the power on. Press and hold button again for two seconds will turn off the power as well as the fan coil and motorized valve. - Temperature setting: With the power on, press
to decrease the temperature setting and 
to increase in steps of 0.5 °C. - Mode selection: With the power on, press M button to switch the operation mode. The LCD indicates cooling with
heating with 
and ventilation with
- Air speed selection: With the power on, press button to select fan speed:
(high), 
(medium),
(low) or 
(automatic) shift. - In automatic mode, the air speed shift changes automatically: With a 1 °C, 2 °C and 3 °C difference between room temperature and the temperature setting, the low, medium and high air speed shift will be automatically selected respectively.
- Motorised valve control (2-pipe models): In cooling (heating) mode, the motorised valve will be switched on when the room temperature is higher than (lower than) the temperature setting by 1 °C and switched off when the room temperature reaches the temperature setting
- Motorised valve control (4-pipe models): In cooling mode, the cold water valve will be opened when the room temperature is 1 °C higher than the temperature setting or closed when the room temperature drops to the setting, and the hot water valve will remain closed. In heating mode, the hot water valve will be opened when the room temperature is 1 °C lower than the temperature setting or closed when the room temperature rises to the setting, and the cold water valve will remain closed.
Energy Saving Mode
Press Eco button to start the energy-saving mode. If the thermostat runs in cooling mode the temperature will be set to 26 °C automatically and the fan will operate at low speed. If the thermostat runs in heating mode the temperature will be set to 18 °C automatically and the fan will operate at low speed. To exit the energy-saving mode, press Eco again or press 
Energy-saving mode of occupancy sensor: This can be switched
to the energy-saving mode by room card and occupancy sensor. For example, after room key is taken out, if the thermostat is in cooling mode, the temperature will be automatically set at 28 °C and fan is on low speed; if the thermostat is on heating mode, 16 °C will be set automatically with fan operating at low speed; the mode that guest has previously chosen will be switched back after the room key is plugged in.
Sleeping energy-saving mode: Under this mode, the thermostat will set temperature from 12 p.m. with 1 °C up or down every one hour and mode is ended at 3 a.m., with a total change of 3 °C. Under cooling mode, the temperature for sleeping mode will not exceed 26 °C; under the heating mode, no less than 18 °C will be set on. The thermostat will set the temperature from 4 a.m. with 1 °C down or up every one hour, until it comes back to the degree that the guest has previously chosen at 7 a.m.
Timing Setting Function
During power-on, press and hold M button for 3 seconds to enter the display screen. Press M button again to select hour, minute, week, working day timing on, working day timing off parameters. Press and to adjust this parameter.
Pressing and holding 
at the same time for five seconds will activate keypad lockup function to prevent thermostat operation by others. Once this function is activated, press hold and the same time for five seconds to unlock the buttons.
Low Temperature Protection Function
If the thermostat is switched off and the room temperature drops below 5 °C, the thermostat will start automatically for heating and display the 
symbol. The fan will run at high speed automatically and the motorized valve will be opened (hot water valve will be opened for 4-pipe models). When the room temperature rises to 7 °C, the low-temperature protection function is canceled and the thermostat will stop automatically, returning to its previously switched-off state.
Alert Function
In the event of an operating exception, the thermostat will attempt to command the valve to close, place the device in an inoperative state and display 
and E1 or E2.
- E1: Sensor short-circuit alert
- E2: Sensor open-circuit alert
HI will be displayed if the temperature is higher than 50 °C.
LO will be displayed if the temperature is lower than 0 °C.
Parameter Settings
During power off, press and hold M button for 5 seconds to enter the display screen. Press M button again to select the parameters as shown in the table below. Press to adjust this parameter.
Notice: This parameter table must be set by specialized installation personnel authorized by Schneider Electric. Any inconvenience or damage caused by unauthorized operation will not be covered by warranty.
Installation Instructions
| No. | Parameter | Factory Default | Function Description |
| 01 | Low-temperature protection | OF | OF: Low-temperature protection deactivated On: Low-temperature protection activated |
| 02 | Fan operation status after temperature setting is reached | 01 | 00: Fan off
01: Fan on |
| 03 | Selection between 2-pipe and 4-pipe systems | 00*
01** |
00: 2-pipe system
01: 4-pipe system |
| 04 | Address setting | 01 | 01 … 32 Address selection range |
| 05 | Sleeping mode | On | On: Sleeping mode activated OF: Sleeping mode deactivated |
| 06 | 12/24-hour timing setting | 24 | 24: 24-hour
12: 12-hour |
| 07 | Mode selection | 00 | 00: FCU cooling or heating 01: FCU cooling only
02: FCU heating only 03: Thermal valve heating |
* TC303-3A2L / TC303-3A2LM / TC303-3A2DLS / TC303-3A2DLMS
** TC303-3A4L / TC303-3A4LM / TC303-3A4DLS / TC303-3A4DLMS
Notes:
- For 2-pipe thermostats, the 03 parameter default is for 2-pipe systems only.
- For 4-pipe thermostats, the 03 parameter default can be changed from 4-pipe system with 2-wire motorised valve to 2-pipe system with 3-wire motorized valve. The 04 parameter is
- for Modbus versions only (TC303-3A2LM, TC303-3A4LM, TC303-3A2DLMS and TC303-3A4DLMS).
- The 05 and 06 parameters are for deluxe models only (TC303-3A2DLS, TC303-3A4DLS, TC303-3A2DLMS and TC303-3A4DLMS).
- The 07 parameter is for 2-pipe models only (TC303-3A2L, TC303-3A2LM, TC303-3A2DLS and TC303-3A2DLMS).
Wiring
Provide an approved disconnecting means and overcurrent protection to supply conductors. The disconnecting device(s) shall meet the relevant requirements of IEC 60947-1 and IEC 60947-3 and shall be suitable for the application. Locate and mark per local requirements.
Standalone
Mounting
- Remove the main control board and insert a 3.5 mm wide flatheaded screwdriver along the bevel into the slot for 4 mm. Pry it upwards with a slight force to release the hook.
- Completely remove the wires from the unit.
- Connect the wires in accordance with the connection diagram shown above.
- Use the two screws supplied in the package box to secure the wired thermostat base plate to the wall.
- Put the two upper hooks in place at 30 degrees. Then, press the two lower corners of the thermostat with a slight force to lock the upper cover. The installation is now finished.
Notice: Please connect the wires in strict accordance with the connection diagram. Avoid the ingress of foreign matter such as water or debris into the thermostat, otherwise it can be damaged.
Modbus Transport Protocols
The TC303 thermostats come with the option of Modbus communication for both 2- and 4-pipe configurations. Modbus is an open, widespread and well established serial communication protocol used within building automation. The support of Modbus communication allows simple integration of the TC303 thermostats to a building management system, using standard Modbus serial communications. The following models provide support for Modbus connectivity:
- TC303-3A2LM
- TC303-3A4LM
- C303-3A2DLMS
- TC303-3A4DLMS
The TC303 thermostats communicate as a Modbus RTU slave device over a serial RS-485 connection, allowing for the transfer of real time data. The RS-485 communication parameters cannot be adjusted and are fixed as follows:
- 4800 bps Baud Rate
- 8 Data Bits
- Odd Parity
- 1 Stop Bit
The actual Modbus address of the thermostat can be set for each individual device on the RS-485 network. The address is defined
via the parameter menu on the thermostat itself. The address range available is from 01 to 32 and is defined under menu item 04 of the parameter settings. For full details on this and other parameter setting options available, please refer to the relevant section of this installation guide.
Connection to the RS-485 network is made via dedicated terminals on the back of the thermostat and marked A (+) and B (-).
The following Modbus register types and formats are supported:
| Function Code | Register Type | Data Type | Data Format |
| 01 | Read Coils | Boolean | Binary/Digital |
| 02 | Read Discrete Inputs | Boolean | Binary/Digital |
| 03 | Read Holding Registers | Word | 16-Bit Unsigned Integer |
| 04 | Read Input Registers | Word | 16-Bit Unsigned Integer |
| 06 | Write Single Register | Word | 16-Bit Unsigned Integer |
Function Code 01
| Reg. Address | Register Description | Value Definition |
| 1 | Cooling Valve in 4-Pipe Application | 0 = Off, 1 = On |
| 5 | Fan Speed Status – High | 0 = Off, 1 = On |
| 6 | Fan Speed Status – Medium | 0 = Off, 1 = On |
| 7 | Fan Speed Status – Low | 0 = Off, 1 = On |
| 8 | Heating Valve in 4-Pipe Application | 0 = Off, 1 = On |
Function Code 02
| Reg. Address | Register Description | Value Definition |
| 3 | Embedded Temperature Sensor Status | 0 = OK, 1 = Fault |
| 4 | Remote Temperature Sensor Status | 0 = OK, 1 = Fault |
Function Codes 03 and 06
| Reg. Address | Register Description | Definition |
| 3 | Thermostat Mode | 0 = Off
1 = On 2 = Frost Protection1 |
| 4 | Operating Mode | 1 = Cool
2 = Heat 3 = Ventilation |
| 5 | Room Temperature Set-point | Temperature (5 to 35 °C) |
| 6 | Fan Mode | 0 = High
1 = Medium 2 = Low 3 = Auto |
| 7 2 | Unoccupied Room Temperature
Set-point (Cooling Mode) |
Temperature (22 to 32 °C) |
| 8 2 | Unoccupied Room Temperature
Set-point (Heating Mode) |
Temperature (10 to 21 °C) |
| 9 2 | Sleep Mode | 0 = Disable
1 = Enable |
| 10 | Eco Mode | 0 = Disable
1 = Enable |
| 11 1, 2 | Occupancy Status | 0 = Unoccupied
1 = Occupied |
| 12 2 | Unoccupied Fan Speed Mode | 0 = High
1 = Medium 2 = Low |
| 13 | Keypad Status | 0 = Unlocked |
1. Read only.
2. DLMS models only.
Function Code 04
| Reg. Address | Register Description | Definition |
| 1 | Actual Room Temperature | Temperature (0 to 50 °C) |
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References:
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SCHNEIDER ELECTRIC TC300 thermostat Installation Instructions
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SCHNEIDER ELECTRIC TC300 thermostat Specification Sheet
SCHNEIDER ELECTRIC TC300 Thermostat Installation Instructions