1. Background and Development Concept
The Fujitsu General VR-II Touch Wall Controller was developed to provide a user-friendly, visually intuitive interface that simplifies operation, enhances energy efficiency, and supports easy installation and maintenance.
It was designed with three key stakeholders in mind:
| User | Installer | Service Personnel |
|---|---|---|
| • Easy operability • Energy-saving features • Modern decorative design | • Simplified wiring and setup • Fewer limitations • Lower installation cost | • Quick error recognition • Easy access to diagnostic data • Error history retention |
This aligns with growing environmental regulations, increased energy-conscious behavior, and building management integration requirements
2. Product Overview
Core Characteristics
Touch-panel interface with wide LCD display
Multi-function operation through intuitive icons and menus
Energy management and control logic
Simplified installation via non-polar wiring
Integrated diagnostics and maintenance menus
The design emphasizes aesthetic appeal and intuitive usability, fitting seamlessly into office, hotel, and institutional interiors.
3. Energy-Saving Control Functions
The controller introduces four key automatic control features to reduce energy consumption and prevent operational waste:
| Function | Description | Typical Application |
|---|---|---|
| 1. Auto-Off Timer | Automatically turns the indoor unit off after a preset duration (30–240 minutes). | Meeting rooms, changing rooms, or offices where users may forget to shut down systems. |
| 2. Set Temperature Auto Return | Automatically reverts the temperature to a predefined setting after a set period (10–120 minutes). | Office environments to prevent users from keeping extreme settings. |
| 3. Upper & Lower Temperature Limits | Restricts adjustable temperature range per mode (e.g., 18–30 °C cooling / 10–25 °C heating). | Restaurants, classrooms, or areas requiring controlled comfort limits. |
| 4. Weekly Timer | Two programmable schedules with up to eight change points per day. Controls On/Off, temperature, and mode by weekday. | Offices, schools, and retail applications. |
These automated functions ensure consistent comfort while maintaining operational efficiency.
4. Convenience Features
Designed for diverse applications—from commercial offices to hospitality—the new wired controller includes multiple user-convenience functions:
| Function | Description |
|---|---|
| Anti-Cool / Anti-Heat Mode | Automatically starts cooling or heating when room temperature exceeds or drops below preset limits—even when the unit is off. Ideal for hotels or unoccupied rooms. |
| Summer Time Display | Adjusts all time-based schedules automatically when daylight saving changes occur—no manual updates required. |
| Child Lock | Prevents accidental or unauthorized adjustments; activated by holding the On/Off button and screen for 4 seconds. Suitable for public or educational spaces. |
| Room Temperature Display | Built-in temperature sensor shows real-time room temperature. (Avoid direct sunlight or airflow exposure.) |
| Status & Limitation Display | Clearly indicates control restrictions imposed by external systems (e.g., On/Off lock, mode lock). |
| Multi-Language Support | Interface available in 7 languages, supporting international installations. |
These enhancements significantly improve usability and transparency, particularly for buildings managed under BMS control.
5. Operational Control Functions
The controller also supports enhanced administrative control features:
| Function | Purpose |
|---|---|
| Password Protection | Locks access to system or energy-saving settings to prevent unauthorized changes. Commonly used in public facilities or server rooms. |
| Name Registration | Indoor units can be individually named (e.g., “Meeting Room 1” or “Lobby AC”) for quick identification on the display. Especially useful in multi-zone installations. |
These features allow facility managers to maintain standardized control parameters while enabling local flexibility.
6. Simplified Installation
The VR-II wired controller is designed for fast, error-free installation, reducing commissioning time.
| Improvement | Description |
|---|---|
| 1. Non-Polar 2-Wire Connection | Replaces the 3-wire system from older models, enabling connection without polarity concerns. Compatible wire thickness: AWG16–22 (1.3–0.3 mm²). |
| 2. Multiple Cable Pass-Through Options | Wiring can enter from the rear or top; additional cable holes improve layout flexibility. |
| 3. Auto Addressing & Location Confirmation | Automatically assigns addresses to connected indoor units. Installers can confirm connection by using temporary louver motion or other display indicators. |
This approach minimizes wiring errors and installation time compared to legacy rotary-switch setups
7. Maintenance & Service Functions
The new touch wall controller doubles as a service tool, allowing quick diagnostics directly from the interface:
| Function | Description |
|---|---|
| Error History Storage | Saves up to 32 historical errors for review. Data retained during power failure (if enabled via DIP switch). |
| Sensor & EEV Monitoring | Displays inlet/outlet heat exchanger temperatures (TH21–TH23) and EEV pulse degree for live performance evaluation. |
| Indoor Unit Model Display | Shows the model number of the connected indoor unit when an error occurs, simplifying field service and part replacement. |
This eliminates the need for separate diagnostic equipment in many troubleshooting scenarios.
8. Technical Highlights
Power Supply: DC 12V via indoor unit communication line
Communication: Non-polar 2-wire system (dedicated signal bus)
Compatibility: VR-II / V-II / J-II indoor units (with feature differences)
Display: Wide monochrome touch LCD with LED backlight
Mounting: Standard wall-mount configuration with surface or recessed wiring options
9. Summary and Benefits
Key Advantages of the VR-II Touch Wall Controller
Intuitive touch-based user interface with enhanced visuals.
Advanced energy-saving automation for commercial environments.
Simplified installation using non-polar wiring and auto addressing.
Integrated error logging and sensor monitoring for service teams.
Multi-language, password-protected operation for flexible deployment in varied facility types.
Ideal Applications
Office complexes
Schools and public facilities
Hotels and hospitality environments
Commercial and retail establishments