1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your OJ Microline UDG4-4999 Touch Screen Programmable Thermostat. Designed for electric radiant floor heating systems, this thermostat features dual voltage (120V/240V) and dual sensing (air/floor) capabilities, along with a built-in Class A GFCI for enhanced safety. Please read this manual thoroughly before installation and use to ensure proper function and safety.
Figure 1: Front view of the OJ Microline UDG4-4999 Thermostat, displaying its intuitive touch screen interface.
2. Safety Information
WARNING: Risk of electric shock. Installation must be performed by a qualified electrician in accordance with local electrical codes. Disconnect power at the circuit breaker before installing or servicing the thermostat.
- Ensure the power supply is disconnected before any wiring is performed.
- The thermostat is designed for indoor use only.
- Do not expose the thermostat to water or excessive moisture.
- The built-in GFCI provides protection against ground faults. Test the GFCI monthly as per instructions.
- Verify voltage compatibility (120V or 240V) before connecting.
3. Setup and Installation
The UDG4-4999 thermostat is designed for easy installation in a standard electrical box. It supports both 120V and 240V systems and includes a floor sensor for precise temperature control.
3.1 Unboxing and Components
Carefully remove the thermostat and its components from the packaging. The package should include:
- OJ Microline UDG4-4999 Thermostat unit
- Floor sensor
- Mounting screws
- This instruction manual
3.2 Wiring Instructions
Follow the wiring diagram below for correct installation. Ensure all connections are secure and comply with local electrical codes. The thermostat requires a dedicated circuit.
Figure 2: Technical specifications and wiring diagram for the UDG4-4999 Thermostat. Note the connections for Neutral, Hot from power source, and House Ground.
- Turn off power at the main circuit breaker.
- Connect the power supply wires (Line/Load) to the appropriate terminals on the thermostat as indicated in the wiring diagram.
- Connect the floor heating cable wires to the designated heating load terminals.
- Connect the floor sensor wires to the sensor terminals. Ensure the sensor is properly placed in the floor according to heating system manufacturer guidelines.
- Secure the thermostat to the electrical box using the provided screws.
- Restore power at the circuit breaker.
4. Operating Instructions
The UDG4-4999 thermostat features an intuitive 3.5" responsive touch color screen for easy operation and programming.
4.1 Initial Setup and Install Wizard
Upon first power-up, the thermostat will guide you through an Install Wizard to set basic parameters such as date, time, temperature units, and floor type.
4.2 Basic Temperature Adjustment
From the main screen, you can easily adjust the setpoint temperature using the up and down arrows. The thermostat will temporarily override any active program until the next scheduled event.
Figure 3: A hand interacting with the thermostat screen to adjust the temperature setpoint.
4.3 Programming the Thermostat
The thermostat offers a 7-day programmable schedule with multiple events per day to optimize comfort and energy savings. Access the programming menu via the main screen's menu button.
- 7-Day Program: Customize heating schedules for each day of the week, allowing different temperature settings for various times (e.g., morning, day, evening, night).
- Adaptive Function: The thermostat features a self-learning, self-adjusting operating system that maintains set temperatures while adjusting run time to help reduce energy consumption.
4.4 Advanced Features
- Child Lock: Prevents unauthorized changes to settings.
- Vacation Mode: Sets the thermostat to a lower, energy-saving temperature for extended periods.
- OPEN Window Mode: Detects sudden drops in temperature (e.g., open window) and temporarily pauses heating to save energy.
- Power Logging: Provides detailed energy usage reports, accessible via the thermostat or potentially through a connected device (if applicable to your model's connectivity features).
5. Maintenance
The OJ Microline UDG4-4999 thermostat requires minimal maintenance.
- Cleaning: Wipe the screen and casing with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- GFCI Test: Press the 'Test' button on the GFCI monthly to ensure it is functioning correctly. The GFCI should trip, cutting power to the heating system. Press 'Reset' to restore power.
- Firmware Updates: Check the manufacturer's website for any available firmware updates that may enhance performance or add features.
6. Troubleshooting
If you experience issues with your thermostat, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat screen is blank. | No power, tripped circuit breaker, or loose wiring. | Check circuit breaker. Ensure wiring connections are secure. Contact a qualified electrician if problem persists. |
| Heating system not turning on. | GFCI tripped, thermostat in OFF mode, or wiring issue. | Press the GFCI 'Reset' button. Check thermostat mode. Verify wiring. |
| Temperature inaccurate. | Floor sensor issue or improper placement. | Ensure floor sensor is correctly installed and not damaged. |
| Cannot turn the thermostat completely OFF for summer. | Thermostat may not have a dedicated 'OFF' button for the heating function, or it's in a continuous program mode. | Set the thermostat to Vacation Mode with a very low setpoint, or use the 'OFF' setting if available in the menu. For complete power disconnection, turn off the dedicated circuit breaker. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | UDG4-4999-B |
| Voltage | 120V / 240V AC |
| Maximum Load | 15 Amps (1800W@120V, 3600W@240V) |
| GFCI | Class A (5mA trip level) |
| Temperature Control Type | Floor Heating |
| Sensing | Dual Sensing (Air & Floor) |
| Floor Limit Range | +41 to +104°F (+5 to +40°C) |
| Ambient Temperature Range | +32 to +104°F (0 to +40°C) |
| Display Type | 3.5 Inch Touchscreen |
| Connectivity Technology | Wired |
| Mounting Type | Wall Mount |
| Certifications | C-UL-us Listed, Certified for Wet Room installations |
| Dimensions | Approx. 6 x 3.5 x 2.6 inches |
| Item Weight | 12.8 ounces |
8. Warranty and Support
8.1 Limited Factory Warranty
The OJ Microline UDG4-4999 Thermostat comes with a 3-Year limited factory Warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
8.2 Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact OJ Electronics customer support. Refer to the official OJ Electronics website for the most current contact information.
