Quick Summary
The HTW-FC09-FVMN-24S modulating thermostat is designed for fan coil unit control. It manages 3-speed fans, EC fans, and 0–10V valve regulation. The controller supports two-pipe FCU systems with modulating valve control. A built-in transformer provides 24V output for valve operation.
This page explains how the modulating thermostat works in FCU control projects. It describes the practical meaning of key control functions. Technical parameters and wiring references are also included. Typical engineering questions and possible project customisation options are also discussed.
Modulating Thermostat Functional Highlights
(This section introduces the main control functions and their engineering value in fan coil unit HVAC systems.)
(01) 3-speed fan and EC fan support
This function allows the thermostat to work with both traditional 3-speed fan units and EC fan units. It means one thermostat model can be used in different types of fan coil systems. This helps simplify project planning and reduces the number of models needed during installation and maintenance.
(02) Two-pipe 0–10V modulating valve control
The thermostat controls the valve using a 0–10V continuous signal. This allows the valve to open and close more smoothly instead of only switching fully on or off. As a result, room temperature can stay more stable and the system can run more efficiently.
(03) Built-in transformer with 24VDC valve output
The thermostat has a built-in transformer that provides a stable 24V output for the valve. Because of this, an external power supply for the valve is usually not required. This helps simplify wiring and makes installation easier for the project.
(04) RS485 Modbus communication
The thermostat supports RS485 Modbus communication for system integration. This allows it to connect with a building management system for central control. Facility teams can monitor room temperature and system status more easily from one platform.
(05) External sensor function
The thermostat can work with an external temperature sensor. This sensor can be installed in another location to measure the actual room temperature. It helps improve control accuracy when the thermostat installation position does not represent the real room conditions.
(06) Weekly programming function
The thermostat supports weekly programming for automatic temperature control. Users can set different temperature schedules for different times of the day and different days of the week. This helps maintain comfort while reducing unnecessary energy use when the room is unoccupied.
Modulating Thermostat Display
(This section shows the thermostat appearance, screen interface, and installation dimensions of this model.)
Modulating Thermostat Specifications
(This section lists the key technical parameters relevant to this thermostat model.)
| Parameter | Value |
|---|---|
| Power Supply | 95~240Vac, 50/60Hz |
| Fan Relay Load | 5A |
| Built-in Sensor | NTC3950, 10K |
| Temperature Accuracy | ±0.5°C |
| Set-Point Range | 5~35°C |
| Warranty | 2 Year |
| Installation | Standard 86×86mm Box |
Modulating Thermostat Wiring Diagram
(This section provides the wiring diagram for this thermostat in fan coil HVAC control systems.)
Project Fit & Customization
(This section describes project suitability, system limitations, and available customization options.)
This thermostat does not support four-pipe FCU systems or on/off valve control logic. Projects requiring BACnet communication are also not suitable for this model. Systems needing mobile app control or Wi-Fi connection should consider other thermostat options.
Despite these limitations mentioned above, certain functions may be customised for specific projects. Communication protocols or control logic may be adjusted when hardware conditions allow. Engineering teams may discuss project needs to evaluate feasible changes.
OEM cooperation is also supported for brand projects or distribution partners. Logo printing, housing colour, and packaging labels may be customised. Such options help match project identity and installation requirements.
Certifications
(This thermostat complies with European market requirements and is supported by certifications such as CE, RoHS, LVD test reports, EMC test reports, etc)
Exhibition Moments
(Our team regularly participates in international HVAC exhibitions such as Febrava in Brazil, The Big 5 in Dubai, and ISK-SODEX in Turkey, etc.)
Frequently Asked Questions
Q1. Can this modulating thermostat work with most FCU systems?
This model is designed for two-pipe fan coil unit systems. It controls fan speed and modulating valves for room temperature regulation.
Q2. How does the external sensor function help in a project?
The external sensor measures temperature from another room position. This improves accuracy when the wall location does not reflect actual room conditions.
Q3. Can this thermostat communicate with a building management system?
Yes. RS485 Modbus communication allows connection to many BMS platforms. Central monitoring can read temperature values and operating status.
Q4. Does the thermostat provide power for the modulating valve?
Yes. The built-in transformer provides stable 24V output. This power can directly drive many common 0–10V FCU valve actuators.
Q5. What is the minimum order quantity and can I get samples?
Samples are available for testing and evaluation. The usual minimum order quantity is around 300 units. Smaller trial orders around 100 units may also be discussed.
Q6. How can I place an order and arrange payment?
Contact us to confirm the model and quantity. We will provide a proforma invoice. Payment can be arranged by TT, PayPal, or Visa.
Q7. How long does product preparation normally take?
Standard samples are usually shipped within seven days. Customised products require programme adjustment and evaluation. Batch orders around 300 units usually take about one month.
Q8. How are the products usually shipped?
Courier delivery such as DHL, FedEx, or UPS usually takes about seven days. Air freight takes around one week. Sea freight may require about one month.
Need Support?
If you need help selecting the right thermostat model, please contact us. Our team can discuss project needs and provide practical application advice. To find out others, please click (Modbus thermostats).
Final Note
HVAC projects require stable room temperature control and reliable fan coil operation. The HTW-FC09-FVMN-24S modulating thermostat manages fan speed, valve regulation, and Modbus communication. These functions support stable operation and allow facility teams to monitor building performance more easily.
