The TFCB24F3XYZ1 is a fully configurable controller designed specifically for 2 pipe and 4 pipe fan coil applications. No additional modules are required as the required inputs, outputs and control algorithms are built into the unit. The TFCB24F3XYZ1 also provides support for networked communications via the BACnet MS/TP protocol
Applications
Typical Application
Fan coil applications provide heating and cooling to a zone by circulating hot and cold air depending on the demand to maintain an optimum temperature in the selected space. A fan coil setup typically consists of fan coil units, source for hot and cold water, and a pipe system for distribution. When there is a demand for heating, the hot water is supplied to the unit through the source and passes over the heating coil, and the hot air is pushed into the zone by the fan. When there is a demand for cooling, the cold water is supplied to the unit through the source and passes over the cooling coil, and the cold air is pushed into the zone by the fan.
Interface
We strongly recommend that all Neptronic products be wired to a separate grounded transformer and that the transformer shall service only Neptronic products. This precaution will prevent interference with, and/or possible damage to incompatible equipment
Wiring – 2 Pipe Terminal Description Details – 2 Pipe
| Terminals | Analog | On/Off | Floating | Step | ||||||||||
| 1 | Common | Common | Common | Common | – | |||||||||
| 2 | 24 Vac | 24 Vac | 24 Vac | 24 Vac | – | |||||||||
| 3 | Common TRIAC | Common TRIAC | Common TRIAC | Common TRIAC | ||||||||||
| 4 | TRIAC Output 1 (TO1) | – | 2 pipe on/off | 2 pipe floating (close) | 9 | |||||||||
| 5 | TRIAC Output 2 (TO2) | – | – | 2 pipe floating (open) | 9 | |||||||||
| 6 | TRIAC Output 3 (TO3) | Local reheat * | Local reheat * | Local reheat * | 21 | |||||||||
| Fan | 1 speed | 2 speed | 3 speed | Analog | 1 speed | 2 speed | 3 speed | Analog | 1 speed | 2 speed | 3 speed | Analog | ||
| 7 | Common Relay | Common Relay | Common Relay | Common Relay | ||||||||||
| 8 | Digital Output 1 (DO1) | – | – | High | – | – | – | High | – | – | – | High | – | 33 |
| 9 | Digital Output 2 (DO2) | – | High | Med | – | – | High | Med | – | – | High | Med | – | 33 |
| 10 | Digital Output 3 (DO3) | Low | Low | Low | AO4 | Low | Low | Low | AO4 | Low | Low | Low | AO4 | 33 |
| 11 | Digital Input 1 (DI1) | Occupancy Sensor * | Occupancy Sensor * | Occupancy Sensor * | ||||||||||
| 12 | Analog Input (AI1) | External Temp Sensor * | External Temp Sensor * | External Temp Sensor * | 38 | |||||||||
| 13 | Analog Input (AI2) | External Changeover * | External Changeover * | External Changeover * | 13 | |||||||||
| 14 | Analog Output 1 (AO1) | 2 pipe analog | – | – | 9 | |||||||||
| 15 | Analog Output 2 (AO2) | – | – | – | 9 | |||||||||
| 16 | Analog Output 3 (AO3) | Local reheat * | Local reheat * | Local reheat * | 21 | |||||||||
| 17 | A+ | BACnet communication | BACnet communication | BACnet communication | – | |||||||||
| 18 | B- | BACnet communication | BACnet communication | BACnet communication | – | |||||||||
Wiring – 4 Pipe Terminal Description Details – 4 Pipe
| Terminals | Cool: Analog Heat: Analog | Cool: On/Off Heat: On/Off | Cool: Analog Heat: On/Off or Pulse | Cool: On/Off Heat: Analog | Step | |||||||||||||
| 1 | Common | Common | Common | Common | Common | – | ||||||||||||
| 2 | 24 Vac | 24 Vac | 24 Vac | 24 Vac | 24 Vac | – | ||||||||||||
| 3 | Common TRIAC | Common TRIAC | Common TRIAC | Common TRIAC | Common TRIAC | |||||||||||||
| 4 | TRIAC Output 1 (TO1) | – | 4 pipe cool (on/off) | – | 4 pipe cool (on/off) | 9 | ||||||||||||
| 5 | TRIAC Output 2 (TO2) | – | 4 pipe heat (on/off or pulse) | 4 pipe heat (on/off or pulse) | – | 9 | ||||||||||||
| 6 | TRIAC Output 3 (TO3) | Local reheat * | Local reheat * | Local reheat * | Local reheat * | 21 | ||||||||||||
| Fan | 1 speed | 2 speed | 3 speed | Analog | 1 speed | 2 speed | 3 speed | Analog | 1 speed | 2 speed | 3 speed | Analog | 1 speed | 2 speed | 3 speed | Analog | ||
| 7 | Common Relay | Common Relay | Common Relay | Common Relay | Common Relay | |||||||||||||
| 8 | Digital Output 1 (DO1) | – | – | High | – | – | – | High | – | – | – | High | – | – | – | High | – | 33 |
| 9 | Digital Output 2 (DO2) | – | High | Med | – | – | High | Med | – | – | High | Med | – | – | High | Med | – | 33 |
| 10 | Digital Output 3 (DO3) | Low | Low | Low | AO4 | Low | Low | Low | AO4 | Low | Low | Low | AO4 | Low | Low | Low | AO4 | 33 |
| 11 | Digital Input 1 (DI1) | Occupancy Sensor * | Occupancy Sensor * | Occupancy Sensor * | Occupancy Sensor * | |||||||||||||
| 12 | Analog Input (AI1) | External Temp Sensor * | External Temp Sensor * | External Temp Sensor * | External Temp Sensor * | – | ||||||||||||
| 13 | Analog Input (AI2) | – | – | – | – | 13 | ||||||||||||
| 14 | Analog Output 1 (AO1) | 4 pipe cool (analog) | – | 4 pipe cool (analog) | – | 18 | ||||||||||||
| 15 | Analog Output 2 (AO2) | 4 pipe heat (analog) | – | – | 4 pipe heat (analog) | 15 | ||||||||||||
| 16 | Analog Output 3 (AO3) | Local reheat (analog)* | Local reheat (analog)* | Local reheat (analog)* | Local reheat (analog)* | 21 | ||||||||||||
| 17 | A+ | BACnet communication | BACnet communication | BACnet communication | BACnet communication | – | ||||||||||||
| 18 | B- | BACnet communication | BACnet communication | BACnet communication | BACnet communication | – | ||||||||||||
Jumpers
| Jumpers | Description | |
| JP1 | TRIAC Output Signal Selector | A&B = Internal: All TRIAC output signals are linked to internal 24 Vac (same as thermostat). B&C = External: All TRIAC output signals are linked to external 24 Vac (different than thermostat). |
| JP2 | Digital Output Signal Selector | A&B = Internal: All digital output signals are linked to internal 24 Vac (same as thermostat). B&C = External: All digital output signals is linked to external 24 Vac (different than thermostat). |
| JP3 | Mode Selection | A&B = RUN: Thermostat is in Operation Mode. (See Operation Mode, page 14) B&C = PGM: Thermostat is in Programming Mode. (See Programming Mode, page 5) |
| JP4 | Fan Output Signal Selection | A&B: Pin 10 of TB1 is set to digital output signal (DO3). (See Step 33) B&C: Pin 10 of TB1 is set to analog output signal (AO4). (See Step 33) |
| JP6 | End of Line | A&B: No End of Line. B&C: 120 Ohm End of Line (on the last TFCB24F3XYZ1 of the RS-485 communication bus). |
| Jumpers | Description | |
| JP1 | TRIAC Output Signal Selector | A&B = Internal: All TRIAC output signals are linked to internal 24 Vac (same as a thermostat). B&C = External: All TRIAC output signals are linked to external 24 Vac (different than thermostat). |
| JP2 | Digital Output Signal Selector | A&B = Internal: All digital output signals are linked to internal 24 Vac (same as a thermostat). B&C = External: All digital output signals are linked to external 24 Vac (different than thermostat). |
| JP3 | Mode Selection | A&B = RUN: Thermostat is in Operation Mode. (See Operation Mode, page 14) B&C = PGM: The thermostat is in Programming Mode. (See Programming Mode, page 5) |
| JP4 | Fan Output Signal Selection | A&B: Pin 10 of TB1 is set to digital output signal (DO3). (See Step 33) B&C: Pin 10 of TB1 is set to analog output signal (AO4). (See Step 33) |
| JP6 | End of Line | A&B: No End of Line. B&C: 120 Ohm End of Line (on the last TFCB24F3XYZ1 of the RS-485 communication bus). |
Programming Mode
Symbols used in this Manual
Compare the displayed temperature reading with a known value from a thermometer. To offset or calibrate the sensor, use the arrows button to set the desired temperature reading. This is useful for thermostats installed in areas where the temperature read is slightly different than the room’s actual temperature. For example, a thermostat placed right under the air diffuser. If the thermostat is set to use an external temperature sensor, (t10.0 at Step 38), the thermostat displays “OFF”.
In Operation mode, you cannot decrease the setpoint to less than the value that is set as the minimum user point. The minimum value is restricted by the maximum value set at Step 3. In other words, the value that is set as the minimum cannot be greater than the maximum value.
In Operation mode, you cannot increase the setpoint to more than the value that is set as the maximum user point. The maximum value is restricted by the minimum value set at Step 2. In other words, the value that is set as the maximum cannot be less than the minimum value.
If set to No, the user setpoint option is not locked and the user can adjust the desired setpoint temperature. If set to Yes, the user setpoint option is locked and the user cannot set the desired setpoint temperature. A lock symbol appears indicating that the setpoint is locked.
Set the desired temperature setpoint within the defined range. If the setpoint option was locked in Step 4, a lock symbol is displayed. The setpoint value is restricted by the minimum (Step 2) and maximum (Step 3) values. In other words, the setpoint should be within in the range of minimum and maximum setpoints.
If you select Yes, the user can set the unit to “Off” via the Control Mode (see page 15). If you select No, the “Off” selection does not appear in the Control Mode.
Select the desired signal output for your 2 pipe system from the available options. The cooling and heating symbols are also displayed.
Select the desired minimum voltage (zero value) for the analog ramp. The minimum value (Step 11) is restricted by the maximum value (Step 12). In other words, the minimum value should be less than the maximum value
Select the desired maximum voltage (span value) for the analog ramp. The maximum value (Step 12) is restricted by the minimum value (Step 11). In other words, the maximum value should be greater than the minimum value.
If SENs is selected: heating mode activates when the temperature read by the external sensor is above the Changeover Setpoint and cooling mode activates when the temperature read by the external sensor is below the Changeover Setpoint. (see Step 14)
This option appears if you have set one of the analog inputs to SENs (External Changeover Sensor) at Step 13. Set the desired changeover temperature setpoint. Note that the heating mode activates when the temperature read by the external sensor is above the changeover setpoint and cooling mode activates when the temperature read by the external sensor is below the changeover setpoint.
This option appears if you have selected 4P at Step 8. Select the heating signal for your 4 pipe system.
Select the desired minimum voltage (zero value) for heating ramp. The minimum value (Step 16) is restricted by the maximum value (Step 17). In other words, the minimum value must be less than the maximum value
Select the desired maximum voltage (span value) for heating ramp. The maximum value (Step 17) is restricted by the minimum value (Step 16). In other words, the maximum value must be greater than the minimum value.
This option appears if you have selected 4P at Step 8. Select the desired cooling signal output for your 4 pipe system.
Select the desired minimum voltage (zero value) for cooling ramp. The minimum value (Step 19) is restricted by the maximum value (Step 20). In other words, the minimum value must be less than the maximum value
Select the desired maximum voltage (span value) for cooling ramp. The maximum value (Step 20) is restricted by the minimum value (Step 19). In other words, the maximum value should be greater than the minimum value
Select the desired signal output for reheat.
If you selected On/Of (On/Off heating and fan), or or PuLS (Pulse heating and fan), go to Step 24.
Select the desired minimum voltage (zero value) of reheat ramp. The minimum value (Step 22) is restricted by the maximum value (Step 23). In other words, the minimum value must be less than the maximum value
Select the desired minimum voltage (zero value) for fan ramp. The minimum value (Step 34) is restricted by the maximum value (Step 35). In other words, the minimum value should be less than the maximum value. The fan symbol is also displayed
Select the desired maximum voltage (span value) for fan ramp. The maximum value (Step 35) is restricted by the minimum value (Step 34). In other words, the maximum value must be more than the minimum value. The fan symbol is also displayed.
Select the Enable or Disable option to allow the user to adjust the Automatic mode. The fan symbol is also displayed.
Select the sensor that should be rewired to the analog output.
This option appears if you have set one of the analog inputs to t10.0 (External temperature sensor 10.0 KΩ) at step 38. When the thermostat is connected to the appropriate analog input (AI1 or AI2), the display shows the temperature read by the external temperature sensor. Adjust the offset by comparing it with a known value (e.g. thermometer). If the sensor is not connected or short circuited, the display is blank “Error“, and the error symbol is displayed.
Select the desired heating setpoint temperature during the no occupancy period. The maximum value is restricted by the cooling setpoint in the no occupancy period (Step 43). In other words, the maximum value must be greater than the no occupancy cooling setpoint value. The moon and heating symbols are also displayed.
Select the desired cooling setpoint temperature during the no occupancy period. The minimum value is restricted by the heating setpoint in the no occupancy period (Step 42). In other words, the minimum value must be less than the no occupancy heating setpoint value. The moon and cooling symbols are also displayed
If this option is enabled, heating starts automatically when the temperature drops to 4ºC [39ºF], even if the thermostat is in OFF mode. Once the temperature reaches 5ºC [41ºF], the heating stops
Enable or disable Auto Baud Rate Detection. If you enable this option, the controller configures its baud rate automatically by detecting the network speed upon connection to the network (go to Step 46). If you disable this option, you must select the baud rate manually (go to Step 47).
Select Yes to copy the configuration of the existing device to other devices of the same type on the network. If you select No, go to Step 53.
Select the first address you want to copy to. For example, if you select MAC address 1 as the begin address and 54 as the end address, all the devices from 1 to 54 will receive the configuration of the current device.
Select the last address you want to copy to. You cannot copy more than 64 addresses at once.
Displays “Succeed” if the addresses have been copied successfully. Otherwise, an error message appears with the associated MAC address. You can scroll through the addresses and see the error message associated with each address. The following is a complete list of error messages
Range: Copy Config” followed by one of these results: “Succeed”, “Progerr”, “Typeerr”, “Modlerr”, “Memerr”, “Slave”, “Commerr”
To change the device instance, select Yes and continue to the next step. If you select No, the device instance will be modified automatically according to the MAC address (the menu starts over at Step 1).
Use the arrow buttons to change the value and press
The BACnet Setup mode is accessible through the normal Operation mode.
These BACnet setup steps are exactly the same as those in the Programming Mode. Please refer to Steps 45 to 54 starting on page 11. When complete continue to the following step.
Compare the displayed temperature reading with a known value from a thermometer. To offset or calibrate the sensor, use the arrows button to set the desired temperature reading. This is useful for thermostats installed in areas where the temperature read is slightly different than the room’s actual temperature. For example, a thermostat placed right under the air diffuser
This option appears if you have set one of the analog inputs to t10.0 (External temperature sensor 10.0 KΩ) at step 38. When the thermostat is connected to input (AI1), the display shows the temperature read by the external temperature sensor. Adjust the offset by comparing it with a known value (e.g. thermometer). If the sensor is not connected or short circuited, the display is blank “Error“, and the error symbol is displayed.
The Mode Selector Jumper (JP3) must be set to the “RUN” mode (Operation Mode). Refer to Wiring on page 2. To exit, set the Jumper (JP3) back to the “PGM” mode (Programming Mode). All changes will be saved
Power Up
Upon power up, the LCD illuminates and all segments appear for 2 seconds. The thermostat then displays its current version for 2
seconds.
LCD Backlight
Pressing any button on the thermostat illuminates the LCD for 4 seconds.
Temperature
The thermostat always displays the temperature reading. If the sensor is disconnected or short circuited then “OFF”, “- – -”, (alarm symbol) are displayed. To toggle the temperature scale between ºC and ºF, press both the
Setpoint
To display the setpoint, press the
No Occupancy Mode
This function is only available if you have selected the derogation time at Step 41 on page 11. If the no occupancy is triggered, the thermostat enters the No Occupancy Mode (the
Control Mode
To access the Control Mode, press the
Fan Speed Selection Mode
To access the Fan Speed selection mode, press the
Neptronic
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