SpaceLogic Thermostat TC900 Series for Digital Fan Coil Applications

Product Description

The TC900 Series fan coil thermostats are optimized for office buildings, hotels, hospitals, and residential applications. They are suitable for 2-pipe or 4-pipe systems and are available in two housing finishes: optimum (black glass display with capacitive buttons on a white base) or medium (white glass display with mechanical buttons on a white base). The thermostats feature microprocessor-based control and large backlit LCD screens displaying operation status (cooling, heating, ventilation), fan speed, room temperature, and set-point.

Specifications

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.
• 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.

If this product is used in a manner not specified by the manufacturer, the protection provided by the product may be impaired. Schneider Electric assumes no responsibility for any consequences arising out of the use of this material.

External housing may be cleaned with a damp cloth if it becomes dirty. Do not use any cleaning agent, especially alcohol.

Dimensions

TC903 Series: 86.0 (3.40") x 86.0 (3.40") x 14.5 (0.57"). Wall box: BS wall box, min. 35 mm depth. Hole pitch: 60 mm (standard).

TC907 Series: 86.0 (3.40") x 86.0 (3.40") x 14.5 (0.57"). Wall box: BS wall box, min. 35 mm depth. Hole pitch: 60 mm (standard).

Control Pollution Degree: Pollution Degree 2

Operation Type: Type 1.B

Terminal sizing: Max: 2 x 1.5 mm² or 1 x 2.5 mm² conductors

European conformance: CE

Agency approvals: IEC/EN 60730-1, IEC/EN 60730-2-9

Functions

Set-point Adjustment

Users can adjust the set-point (in 0.5 °C increments) for the space using the set-point buttons.

Fan Speed

Users can select a fan speed (High, Medium, Low, or Automatic) by pressing the FAN/ECO button (TC903) or the FAN button (TC907).

Mode Control

Users can switch operating modes (Heating, Cooling, or Ventilation) by pressing the Mode button.

Eco Mode

To activate Eco mode, press the FAN/ECO button (TC903) or the ECO button (TC907) until the ECO icon flashes. In Cooling mode, the set-point adjusts to 26°C and fan speed to Low. In Heating mode, the set-point adjusts to 18°C and fan speed to Low. To exit Eco mode, press the FAN/ECO button (TC903) to select another fan speed, or press the ECO button (TC907) to cancel Eco mode.

Button Lockout Function

This function allows buttons to be deactivated to prevent unauthorized operation. Press and hold the up and down buttons simultaneously for six seconds to activate/deactivate.

Low Temperature Protection

If the room temperature drops below 5 °C, Heating mode starts automatically with the fan set to High speed. Once the temperature reaches 7 °C, the thermostat switches off the output.

Alert

In case of an operating exception, the thermostat will attempt to command the valve to close and enter an inoperative state. The display will show one of five diagnostic messages: 'EE' (EEPROM), 'E1' (Temperature sensor short-circuit), 'E2' (Temperature sensor open-circuit), 'HI' (Ambient temperature > 50°C), 'LO' (Ambient temperature < 0°C).

Installation Guidelines

• Install the thermostat approximately 1.5 m (59") above the floor.
• Ensure the device is powered off before installation or service.
• Do not install in locations affected by radiant heat or direct sunlight.
• Avoid installing thermostats behind doors or in corners.
• Protect from water and debris to prevent thermostat damage.

Operation Instructions

Power On/Off

A short press of the ON/OFF button turns the power on. Another short press turns off the power, fan coil, and motorized valve. The backlight turns off after 10 seconds of inactivity. Press any button to reactivate the backlight.

Temperature Setting

With power on, press the '-' button to decrease and the '+' button to increase the temperature setting in 0.5°C increments. The '+' symbol appears on the display. The setpoint is confirmed after six seconds of inactivity.

Mode Selection

With power on, press 'M' to cycle through operation modes: Cooling (❄), Heating (?), or Ventilation (?). Auto mode (?) can be selected in parameter settings.

Fan Speed Selection

With power on, press the fan button (TC903: ?, TC907: ?) to select fan speed: High, Medium, Low, or Automatic. In Automatic mode, fan speed adjusts based on temperature difference: Low for 1°C difference, Medium for 2°C, and High for 3°C or more.

Motorized Valve Control (2-Pipe Models)

In cooling mode, the motorized valve opens when the room temperature is 1°C above the set-point and closes when it reaches the set-point. In heating mode, the valve operates inversely.

Motorized Valve Control (4-Pipe Models)

In Cooling mode, the cold water valve opens when the room temperature is 1°C higher than the set-point and closes when it reaches the set-point. The hot water valve remains closed. In Heating mode, the hot water valve opens when the room temperature is 1°C lower than the set-point and closes when it reaches the set-point. The cold water valve remains closed.

Energy Saving Functions

Eco Mode

Press the FAN/ECO button (TC903) or ECO button (TC907) to activate Eco mode. The display shows ❄ and ? icons. In Cooling mode, the set-point is 26°C with low fan speed. In Heating mode, the set-point is 18°C with low fan speed. To exit Eco mode, adjust the temperature or press the FAN/ECO or ECO buttons.

Unoccupied Energy Saving Mode

This mode can be activated via a hotel room key card or bioprobe. When the key card is removed, ? and ? icons appear. In cooling mode, the set-point is 28°C with low fan speed. In heating mode, the set-point is 16°C with low fan speed. Returning the key card deactivates this mode.

Sleep Energy Saving Mode

Activated at 12:00 a.m., this mode adjusts the set-point by 1°C every hour until 3:00 a.m., then reverses the adjustment until 7:00 a.m. The cooling set-point will not exceed 26°C, and the heating set-point will not drop below 18°C.

Time Setting Function

During power-on, press and hold 'M' for six seconds to enter Time Setting mode. Press 'M' again to select hour, minute, and week. Use the up/down buttons to adjust. The mode exits automatically after six seconds of inactivity.

Parameter Settings

During power off, press and hold the 'M' button for six seconds to enter the display screen. Use the 'M' or Fan button to navigate parameters. Use the up/down buttons to adjust. The table below details the parameters:

Notes: Parameters 01-11 apply to all models. Parameters 12-15 apply to models with 'M' (Modbus). Parameters 16-22 apply to models with 'S' (RTC/external sensors). Parameters 23-25 apply to models with 'F' (DC brushless fan). Skip parameters for models without specific functions. Parameter settings must be done by authorized Schneider Electric personnel.

Wiring

Provide an approved disconnecting means and overcurrent protection to supply conductors. Locate and mark per local requirements.

Mounting:

1. Insert a 3.5 mm flat head screwdriver into the slot and pry upwards to release the two hooks.
2. Remove the display from the base module. Carefully remove wire connections if necessary.
3. Connect wires according to the appropriate wiring diagram. Ensure correct polarity of the mains supply.
4. Mount the base module onto the wall box using the supplied screws.
5. Fit the display module onto the base module, aligning the upper hooks. Replace wiring connections if removed. Click the display module onto the base module using the two lower hooks.

Wiring Diagrams:

Diagrams illustrate various configurations for TC903/TC907 series thermostats, including 2-pipe and 4-pipe systems with different valve types and Modbus connectivity.

Modbus Transport Protocols

The TC900 Series thermostats offer Modbus communication for integration with building management systems. Models with 'M' in the part number support Modbus RTU slave communication over RS-485. Communication parameters (Baud Rate, Parity check, Device Modbus Address) can be adjusted via menu items 12-15.

Modbus Register Types and Formats:

Register Descriptions:

Detailed register descriptions are provided for various functions including valve control, fan speed status, sensor status, thermostat mode, set-points, energy saving modes, and Modbus communication settings.