1. Introduction
This manual provides essential instructions for the installation, operation, and maintenance of your Rheem RRTG20006DW Digital Display Remote Control, also known as UMC-117. This remote control is designed to provide precise temperature management for compatible Rheem tankless water heaters, enhancing user comfort and system efficiency.
2. Safety Information
Read all instructions carefully before installation and operation. Failure to follow these instructions could result in property damage, personal injury, or death. Keep this manual for future reference.
- Electrical Safety: Ensure power to the water heater is disconnected before attempting any installation or maintenance. All electrical work should be performed by a qualified professional.
- Water Safety: Be aware of potential water leaks during installation. Turn off the water supply to the water heater if necessary.
- Professional Installation: If you are unsure about any part of the installation process, consult a qualified technician.
- Avoid Scalding: Always test water temperature before use to prevent scalding.
3. Package Contents
Verify that your package contains the following items:
- Rheem RRTG20006DW Digital Display Remote Control (UMC-117)
- Mounting hardware (screws, wall plate)
Note: Connecting wires (typically 18/2 gauge) are not included and must be supplied separately.
4. Setup and Installation
The Rheem RRTG20006DW remote control is designed for straightforward replacement or new installation. Follow these steps:
- Power Disconnection: Before beginning, ensure the power supply to your tankless water heater is completely disconnected at the circuit breaker.
- Remove Existing Remote (if applicable): If replacing an existing remote, locate the bottom center set screw. Loosen or remove this screw. Gently pivot the bottom of the remote away from the wall. The unit is typically secured by two hooks on the upper sides that mate with a metal wall mounting plate. Lift the remote upwards to detach it from the wall plate.
- Wiring Connection: Connect the 18/2 gauge wires from the water heater to the terminals on the back of the new remote control. The wiring polarity (positive/negative) is generally not a factor for this unit. Existing wires are often colored red and white.
- Mounting: Secure the new remote control to the wall mounting plate. Ensure it is level and firmly attached. Re-insert and tighten the bottom center set screw.
- Power Reconnection: Once the remote is securely installed and wired, restore power to the water heater at the circuit breaker.
This image displays the Rheem RRTG20006DW Digital Display Remote Control, also known as UMC-117. The remote features a digital display, 'PRIORITY' indicator, up and down arrow buttons, and a 'POWER ON/OFF' button. Dimensions are indicated on the right, showing a height of approximately 4.9 inches (12 cm).
5. Operation
The Rheem RRTG20006DW remote control provides intuitive operation for your tankless water heater.
- Power On/Off: Press the POWER ON/OFF button to turn the water heater system on or off.
- Temperature Adjustment: Use the Up (▲) and Down (▼) arrow buttons to adjust the desired water temperature. The digital display will show the current temperature setting. Temperature can typically be adjusted in 2-degree increments.
- Digital Display: The display shows the set temperature and may indicate system status or error codes.
- PRIORITY Indicator: This indicator illuminates when the remote control has priority over other potential control units in a multi-controller setup.
6. Maintenance
The Rheem RRTG20006DW remote control requires minimal maintenance to ensure long-term performance.
- Cleaning: Wipe the surface of the remote control with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Environment: Ensure the remote control is installed in a dry location, away from excessive humidity or corrosive materials (e.g., salt, strong detergents) to prevent potential corrosion of internal components.
7. Troubleshooting
This section addresses common issues you might encounter with your remote control.
| Problem | Possible Cause | Solution |
|---|---|---|
| Remote display is blank or unresponsive. | No power to the water heater or remote, loose wiring connection. |
|
| Error Code 76 (or C4-C7) displayed. | Communication error between the remote control and the water heater unit. |
|
| Incorrect temperature displayed or adjusted. | Sensor issue or communication problem. |
|
For more detailed diagnostic information, refer to the full technical manual for your specific Rheem tankless water heater model or contact Rheem customer support.
8. Specifications
| Brand | Rheem |
| Model Name | RRTG20006DW (UMC-117) |
| Item Weight | 9.6 ounces |
| Connectivity Technology | Infrared (Note: This refers to internal communication, the unit is wired to the water heater) |
| Controller Type | Button Control |
| Maximum Number of Supported Devices | 1 |
| Approximate Dimensions (Height) | 4.9 inches (12 cm) |
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact Rheem customer service. Keep your purchase receipt and product model number handy when contacting support.
Rheem Customer Support: Refer to the official Rheem website or your water heater's main manual for current contact information.
