1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Fafeicy Digital Fan Coil Unit Thermostat. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Key Features
- Large LCD display with blue backlight for clear data visibility.
- High-accuracy NTC thermistor temperature sensor for fast and reliable readings.
- Suitable for temperature control and heating equipment control of fan coil units, electric valves, power-driven air valves, and power-driven intake of central air conditioning.
- Clear keys for visual display of room temperature, heating/cooling status, and wind speed.
- Adjustable wind speed settings: High, Medium, Low, Automatic.
- Compatible with 2 or 3-line applicable valves.
- Compact size: Approx. 86x86x13mm (3.4x3.4x0.5in) with standard 60mm (2.4in) hole spacing.
3. Package Contents
Verify that all items are present upon opening the package:
- 1 x Fafeicy Digital Fan Coil Unit Thermostat
- 1 x Instruction Manual
- 2 x Mounting Screws
4. Technical Specifications
| Specification | Detail |
|---|---|
| Brand | Fafeicy |
| Model Name | Fafeicyvayb4x09pg |
| Product Dimensions | 0.51"D x 3.39"W x 0.51"H (86x86x13mm) |
| Controller Type | Push Button |
| Special Feature | Programmable |
| Temperature Control Type | Programmable |
| Connectivity Technology | Wired |
| Power Source | Hardwire (24V) or 2x AAA Batteries |
| Item Weight | 7.1 ounces (200 Grams) |
| Voltage | 1 Volts (likely referring to control voltage, actual system voltage is 24V) |
| Material | ABS+PC Fire Retardant |
| Display Type | LCD with Blue Backlight |
| Mounting Type | Wall Mount |
| Temperature Sensing | NTC Thermistor |
| Accuracy | ±1°C |
| Set Point Range | 17-35°C |
| Display Range | 0-60°C |
| IP Level | IP30 |
5. Setup and Installation
5.1 Safety First
Before beginning any installation, ensure the power to your HVAC system is turned OFF at the circuit breaker to prevent electrical shock.
5.2 Removing Your Old Thermostat
- Turn off power to your HVAC system at the circuit breaker.
- Carefully remove the cover of your old thermostat.
- Take a photo of the existing wiring connections for reference.
- Disconnect the wires one by one, using the provided wiring labels to mark each wire with its corresponding terminal designation (e.g., R, W, Y, G, C).
- Unscrew and remove the old thermostat's base plate from the wall.
5.3 Mounting the New Thermostat Base Plate
- Position the new thermostat's base plate on the wall where the old thermostat was located.
- Use the provided mounting screws to secure the base plate to the wall. Ensure it is level for aesthetic purposes.
Figure 1: Rear view of the thermostat showing wiring terminals.
5.4 Wiring Connections
- Feed the thermostat wires through the opening in the new base plate.
- Connect each labeled wire to the corresponding terminal on the new thermostat's base plate. Refer to the wiring diagram in the included instruction manual for specific configurations.
- Ensure all connections are secure.
Figure 2: Front and back views of the thermostat, illustrating the wiring terminals on the rear.
5.5 System Type Configuration (Electric/Gas)
On the back of the thermostat unit (not the base plate), locate the small switch labeled 'ELEC/GAS'. Set this switch according to your HVAC system type (Electric or Gas furnace).
5.6 Attaching the Thermostat Unit
- Align the thermostat unit with the installed base plate.
- Gently push the unit onto the base plate until it clicks securely into place.
5.7 Battery Installation
Open the battery compartment (usually a hinged door on the front or top of the unit). Insert 2 AAA alkaline batteries, ensuring correct polarity. Close the battery compartment.
Video 1: Product Overview - This video demonstrates the physical features of a similar thermostat, including the battery compartment and system switches, which are relevant for installation and initial setup.
5.8 Power On
Restore power to your HVAC system at the circuit breaker. The thermostat display should now illuminate.
6. Operating Instructions
6.1 Understanding the Display
Figure 3: Front view of the thermostat with its large, illuminated LCD display.
The large LCD display shows the current room temperature, the set temperature, the current system mode (Heat/Cool/Off), fan status (On/Auto), and fan speed indicators. It also displays humidity levels.
6.2 Setting the Temperature
Use the Up (▲) and Down (▼) arrow buttons on the right side of the thermostat to adjust your desired temperature. The display will show the set temperature as you adjust it.
6.3 System Mode Selection
Use the SYSTEM switch located at the bottom right of the thermostat to select the desired operating mode:
- COOL: Activates the cooling system.
- OFF: Turns off both heating and cooling systems.
- HEAT: Activates the heating system.
6.4 Fan Operation
Use the FAN switch located at the bottom left of the thermostat to select the fan operation mode:
- ON: The fan runs continuously.
- AUTO: The fan cycles on only when the heating or cooling system is actively running.
7. Maintenance
7.1 Battery Replacement
When the low battery indicator appears on the display, replace the 2 AAA alkaline batteries promptly to ensure continuous operation. Open the battery compartment, remove old batteries, insert new ones with correct polarity, and close the compartment.
7.2 Cleaning
To clean the thermostat, gently wipe the exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents. Avoid spraying liquids directly onto the thermostat.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank | No power or dead batteries | Check circuit breaker. Replace AAA batteries. Ensure 24V power is connected if not using batteries. |
| System (Heat/Cool) not responding | Incorrect wiring, system switch setting, or compressor delay. | Verify wiring connections. Ensure SYSTEM switch is set to HEAT or COOL. Allow 3-minute compressor delay protection to complete. Check the ELEC/GAS switch setting. |
| Fan not operating | Incorrect fan switch setting or system not calling for heat/cool. | Ensure FAN switch is set to ON for continuous operation or AUTO for automatic cycling with system. |
| Inaccurate temperature reading | Thermostat location, sensor issue, or calibration needed. | Ensure thermostat is not exposed to direct sunlight, drafts, or heat sources. Refer to the full instruction manual for room temperature calibration adjustment procedures. |
9. Warranty and Support
9.1 Warranty
This Fafeicy thermostat comes with a 2-year warranty from the date of purchase, covering defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For technical assistance, troubleshooting, or warranty inquiries, please refer to the contact information provided in your product packaging or visit the official Fafeicy website.