1. Introdución
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.

Figura 1: Fronte view of the OJ Microline UDG4-4999 Thermostat, displaying its intuitive touch screen interface.
2. Información de seguridade
AVISO: 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.
- Non expoñas o termostato á auga nin a humidade excesiva.
- The built-in GFCI provides protection against ground faults. Test the GFCI monthly as per instructions.
- Verificar voltage compatibility (120V or 240V) before connecting.
3. Configuración e instalación
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 Desembalaxe e compoñentes
Carefully remove the thermostat and its components from the packaging. The package should include:
- OJ Microline UDG4-4999 Thermostat unit
- Sensor de piso
- Parafusos de montaxe
- Este manual de instrucións
3.2 Instrucións de cableado
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.
- Desconecte a alimentación no disyuntor principal.
- 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.
- Fixe o termostato á caixa eléctrica empregando os parafusos proporcionados.
- Restablecer a enerxía no interruptor automático.
4. Instrucións de funcionamento
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 Programación do termostato
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).
- Función adaptativa: 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 Funcións avanzadas
- Bloqueo para nenos: Impide cambios non autorizados na configuración.
- Modo vacacións: 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. Mantemento
The OJ Microline UDG4-4999 thermostat requires minimal maintenance.
- Limpeza: Limpar a pantalla e casing cun suave, damp pano. Non use produtos de limpeza ou disolventes abrasivos.
- Proba GFCI: 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.
- Actualizacións de firmware: Consulte o do fabricante website for any available firmware updates that may enhance performance or add features.
6 Solución de problemas
Se tes problemas co teu termostato, consulta os seguintes problemas e solucións comúns:
| Problema | Causa posible | Solución |
|---|---|---|
| A pantalla do termostato está en branco. | No power, tripped circuit breaker, or loose wiring. | Check circuit breaker. Ensure wiring connections are secure. Contact a qualified electrician if problem persists. |
| O sistema de calefacción non se acende. | GFCI tripped, thermostat in OFF mode, or wiring issue. | Press the GFCI 'Reset' button. Check thermostat mode. Verify wiring. |
| Temperatura imprecisa. | 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. Especificacións
| Característica | Detalle |
|---|---|
| Número de modelo | UDG4-4999-B |
| Voltage | 120 V/240 V CA |
| Carga máxima | 15 Amps (1800W@120V, 3600W@240V) |
| GFCI | Class A (5mA trip level) |
| Tipo de control de temperatura | Calefacción por chan |
| Sensación | Dual Sensing (Air & Floor) |
| Floor Limit Range | +41 a +104 °F (+5 a +40 °C) |
| Rango de temperatura ambiente | +32 a +104 °F (0 a +40 °C) |
| Tipo de visualización | Pantalla táctil de 3.5 polgadas |
| Tecnoloxía de conectividade | Con cable |
| Tipo de montaxe | Soporte de parede |
| Certificacións | C-UL-us Listed, Certified for Wet Room installations |
| Dimensións | Aprox. 6 x 3.5 x 2.6 polgadas |
| Peso do elemento | 12.8 onzas |
8. Garantía e soporte
8.1 Limited Factory Warranty
The OJ Microline UDG4-4999 Thermostat comes with a 3-Year limited factory WarrantyEsta garantía cobre defectos de materiais e fabricación en condicións normais de uso. Conserve o comprobante de compra para reclamacións de garantía.
8.2 Atención ao cliente
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact OJ Electronics customer support. Refer to the official OJ Electronics websitio para obter a información de contacto máis actualizada.





