1. Introdución
The Hydrolevel Model 3250 Fuel Smart Hydrostat is an advanced control unit designed for oil boilers. It integrates temperature limit, low water cut-off (LWCO), and boiler reset functionalities to optimize boiler performance and fuel efficiency. This manual provides essential information for the safe and effective installation, operation, and maintenance of your Model 3250 Hydrostat.
The Model 3250 is engineered to be a universal replacement for many common aquastat models, offering both cold start and tankless coil operation. Its design focuses on ease of use with dial-type limit settings and industry-standard wiring designations.
2. Información de seguridade
ADVERTENCIA: Unha instalación, un axuste, unha alteración, unha revisión ou un mantemento incorrectos poden causar danos materiais, lesións ou a morte. Lea estas instrucións detidamente antes de instalar ou realizar o mantemento deste equipo.
- Always disconnect power to the boiler before performing any installation, wiring, or maintenance.
- A instalación e o mantemento deben ser realizados por un técnico de calefacción cualificado.
- Asegúrese de que todo o cableado cumpra cos códigos eléctricos locais e nacionais.
- Do not operate the boiler if any part of the control is damaged.
- This device operates on 230 Volts. Exercise extreme caution.
3. Configuración e instalación
The Hydrolevel Model 3250 is designed for straightforward installation, often serving as a direct replacement for older aquastat models. It does not require an outdoor sensor.
3.1 Montaxe
The unit can be surface mounted or wall mounted. Ensure the mounting location is secure and allows for proper wiring connections and access to controls.
3.2 Cableado
Follow industry-standard wiring designations. Refer to the wiring diagram provided with the product packaging for specific connections. The Model 3250 works with virtually any boiler.
Important Note on LWCO:
- When installed on an existing standard immersion well, the unit provides only temperature and reset functionality.
- For automatic Low Water Cut-Off (LWCO) functionality, the Model 3250 must be installed on an ElectroWell.
3.3 Configuración inicial
After installation, set the number of heating zones using the dial control. The unit provides cold start and tankless coil operation capabilities.

Figure 1: Hydrolevel Model 3250 Fuel Smart Hydrostat. This image shows the front view of the control unit, typically black with a display and control dials.
4. Funcionamento
The Model 3250 is designed to optimize boiler performance and fuel consumption through its intelligent features.
4.1 Temperature Limit Settings
Adjust the high and low temperature limits using the dial controls. These settings determine the operating range of your boiler water temperature.
4.2 Thermal Targeting Feature
The Thermal Targeting feature is factory set to the OFF position. When activated, this feature dynamically adjusts the boiler water temperature based on changes in the heat load. This helps to lower the boiler temperature, saving fuel without compromising comfort.
Consult the detailed wiring and operation guide included with your product for instructions on activating and configuring Thermal Targeting.
4.3 Cold Start and Warm Start
The unit supports both cold start and warm start operations, allowing flexibility based on your boiler system's requirements and desired energy efficiency.
5. Mantemento
Regular maintenance ensures the longevity and optimal performance of your Hydrolevel Model 3250 Hydrostat and the entire boiler system.
- Inspección anual: Have a qualified technician inspect the control unit and boiler system annually.
- Comprobación do sensor: If LWCO functionality is active, ensure the sensor in the ElectroWell is clean and making good contact. Over time, mineral deposits can affect sensor performance. If a low water condition warning occurs despite adequate water, the sensor may need cleaning.
- Integridade do cableado: Comprobe periodicamente todas as conexións do cableado para comprobar se están ben axustadas e se presentan signos de desgaste ou corrosión.
- Limpeza: Keep the exterior of the control unit clean and free from dust and debris. Use a soft, dry cloth. Do not use liquid cleaners.
6 Solución de problemas
This section addresses common issues you might encounter with your Model 3250 Hydrostat.
6.1 Boiler Not Firing / No Heat
- Comprobar a potencia: Ensure the boiler and control unit have power. Check circuit breakers.
- Thermostat Call: Verify that the thermostat is calling for heat.
- Nivel de auga: If LWCO is active, check the boiler water level. A low water condition will prevent the boiler from firing.
- Limit Settings: Ensure temperature limit settings are appropriate for your system.
6.2 Erratic Temperature Readings / Short Cycling
- Contacto do sensor: Ensure the temperature sensor is properly seated in the immersion well and making good contact.
- Cableado: Check for loose or corroded wiring connections to the sensor and control unit.
- Aire no sistema: Air pockets in the boiler system can cause erratic temperature readings. Bleed the system if necessary.
6.3 Low Water Condition Warning (False Alarm)
If the LWCO activates but the boiler has sufficient water:
- Limpeza de sensores: The LWCO sensor in the ElectroWell may have mineral deposits. Disconnect power, remove the sensor, and carefully clean any buildup from the metal spring or probes. Reinstall and restore power.
- Cableado: Inspect wiring to the ElectroWell for damage or loose connections.
If troubleshooting steps do not resolve the issue, contact a qualified heating technician.
7. Especificacións
| Característica | Detalle |
|---|---|
| Marca | Hidronivel |
| Nome do modelo | 3250-Plus |
| Tipo de controlador | Mechanical knob, Dial Control |
| Característica especial | Thermal Targeting |
| Cor | Negro |
| Usos específicos | Boiler, Heat Pump |
| Tipo de control de temperatura | Manual |
| Tecnoloxía de conectividade | RF |
| Fonte de enerxía | Eléctrico con cable |
| Voltage | 230 voltios |
| Material | Metal, Plástico |
| Tipo de visualización | LCD |
| Tipo de montaxe | Surface Mount/Wall Mount |
| Peso do elemento | 2 libras |
| Dimensións do produto | 1 x 1 x 1 polgadas (aproximado) |
| UPC | 642277482501 |
8. Garantía e soporte
For specific warranty information regarding your Hydrolevel Model 3250 Fuel Smart Hydrostat, please refer to the warranty card included with your product packaging or visit the official Hydrolevel websitio. Os termos da garantía adoitan cubrir os defectos de fabricación durante un período específico a partir da data de compra.
For technical support, service, or to inquire about replacement parts, please contact Hydrolevel customer service directly. Contact information can usually be found on the product packaging or the manufacturer's websitio.
Recursos en liña: For additional information, FAQs, and support documents, visit the Hydrolevel official websitio.





