1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Honeywell Home RCA900N1008 16V Low Voltage Transformer. This transformer is designed to convert standard 120V AC 60 Hz input to 16V AC 10VA output, making it suitable for powering Honeywell Home wired door chimes and other compatible low-voltage devices.
Please read this manual thoroughly before installation and retain it for future reference.
2. Safety Information
WARNING: Risk of Electric Shock. Installation should be performed by a qualified electrician or in accordance with local electrical codes.
- Always disconnect power at the circuit breaker or fuse box before installing or servicing the transformer.
- Ensure all wiring connections are secure and properly insulated.
- Do not exceed the specified voltage and current ratings of the transformer or connected devices.
- This transformer is designed for indoor use in dry locations only.
- Waste electrical products should not be disposed of with household waste. Please recycle where facilities exist. Check with your local authority or retailer for recycling advice.
3. Package Contents
Verify that your package contains the following item:
- Honeywell Home RCA900N1008 16V Low Voltage Transformer (1 unit)
4. Specifications
| Model | RCA900N1008 |
| Input Voltage | 120V AC, 60 Hz |
| Output Voltage | 16V AC, 10VA |
| Dimensions (H x W x D) | 2.5" x 3.5" x 2.5" (6.35 cm x 8.89 cm x 6.35 cm) |
| Weight | 12.8 ounces (362.87 grams) |
| Mounting Type | Door Mount (designed to mount to an electrical box) |
| Power Source | Corded Electric |
5. Setup and Installation
The Honeywell Home RCA900N1008 transformer is designed for simple installation, typically mounting to an electrical junction box. Follow these steps carefully:
5.1 Prepare for Installation
- Turn off power: Locate the circuit breaker or fuse that supplies power to the installation area and turn it off. Verify that power is off using a voltage tester.
- Gather tools: You will need basic electrical tools such as a screwdriver, wire strippers, and a voltage tester.
- Identify wiring: Ensure you can identify the 120V AC input wires (typically black for hot, white for neutral, and green/bare for ground) and the low-voltage wires for your door chime or device.
5.2 Mounting the Transformer
The transformer is designed to mount directly to an electrical box. It features an L-shaped bracket with a screw-down tab for secure attachment.

Image: Honeywell Home RCA900N1008 transformer mounted to an electrical junction box. This image shows the transformer securely attached to the side of a standard electrical box, with wiring connections visible.
- Position the transformer's mounting bracket against the electrical box.
- Secure the transformer to the electrical box using the provided screw or an appropriate mounting screw, ensuring it is firmly attached.
5.3 Wiring Connections
The transformer has three input wires for 120V AC and two output terminals for 16V AC.

Image: Close-up view of the Honeywell Home RCA900N1008 transformer's wiring. This image details the input wires (black, white, green) and the low-voltage output terminals, showing how they are connected.
- Connect 120V AC Input:
- Connect the black wire from the transformer to the hot (black) wire from your 120V AC power source.
- Connect the white wire from the transformer to the neutral (white) wire from your 120V AC power source.
- Connect the green wire from the transformer to the ground (green or bare copper) wire from your 120V AC power source.
- Use appropriate wire connectors (e.g., wire nuts) and ensure connections are tight and insulated.
- Connect 16V AC Output:
- Connect the two low-voltage wires from your door chime or other compatible device to the two screw terminals on the transformer.
- The output is AC, so polarity typically does not matter for most door chimes.

Image: Rear view of the Honeywell Home RCA900N1008 transformer. This image highlights the two screw terminals for low-voltage output connections.

Image: Side view of the Honeywell Home RCA900N1008 transformer. This image provides a perspective of the transformer's compact size and construction.
5.4 Final Steps
- Double-check all wiring connections for security and proper insulation.
- Ensure no bare wires are exposed.
- Restore power at the circuit breaker or fuse box.
- Test the connected low-voltage device (e.g., press the doorbell button).
6. Operation
The Honeywell Home RCA900N1008 transformer operates continuously once installed and powered. It provides a constant 16V AC output to connected low-voltage devices.
- No user interaction is required for the transformer's operation after installation.
- The transformer will supply power as long as the 120V AC input is present.
7. Maintenance
The Honeywell Home RCA900N1008 transformer is designed for maintenance-free operation. However, periodic checks are recommended:
- Annual Inspection: Annually, visually inspect the transformer and its wiring connections for any signs of damage, wear, or loose connections. Ensure power is off before inspection.
- Cleaning: If necessary, gently wipe the exterior of the transformer with a dry, soft cloth. Do not use liquid cleaners or solvents.
- Temperature: Ensure the transformer is not exposed to extreme temperatures or moisture, which can affect its performance and lifespan.
8. Troubleshooting
If your low-voltage device (e.g., doorbell chime) is not functioning correctly, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not receiving power / not working. |
|
|
| Transformer is humming loudly. |
|
|
| Transformer feels hot to the touch. |
|
|
9. Warranty Information
This Honeywell Home RCA900N1008 Low Voltage Transformer comes with a 1 Year Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
For warranty claims or further details, please contact Honeywell Home customer support.
10. Customer Support
For technical assistance, troubleshooting not covered in this manual, or warranty inquiries, please contact Honeywell Home customer support through their official website or the contact information provided with your purchase.
When contacting support, please have your product model number (RCA900N1008) and purchase date available.





