1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Caleffi Automatic Filling Unit Model 553140. This unit is designed to automatically maintain the correct pressure in closed-circuit heating systems by refilling water as needed. Please read these instructions thoroughly before installation and use.
2. Safety Information
- Installation should only be performed by a qualified professional in accordance with local regulations and standards.
- Ensure the main water supply is turned off before beginning any installation or maintenance work.
- Do not exceed the maximum operating pressure or temperature specified in the technical data.
- Always wear appropriate personal protective equipment during installation and maintenance.
3. Product Overview
The image displays the Caleffi Automatic Filling Unit 553140. This brass-bodied unit features a black and yellow adjustment knob on top for pressure setting, and an integrated pressure gauge indicating 'bar' units for monitoring system pressure. It includes an inlet connection on the left, an outlet connection on the right, and a grey cap at the bottom which covers the filter housing. The unit also incorporates a stopcock and a non-return valve for system protection and control.
4. Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | 553140 |
| Manufacturer | CALEFFI |
| Material | Metal (Brass) |
| Dimensions (L x W x H) | 15.7 x 10.2 x 5.6 cm |
| Weight | 900 grams |
| Thread Size | 1/2 inch |
| Connector Type | Tee |
| Adjustment Range | 0.3 ÷ 4 bar |
| Max Inlet Pressure | 16 bar |
| Max Operating Temperature | 70 °C |
| Exterior Finish | Gold |
5. Setup and Installation
- Preparation: Ensure the heating system is depressurized and the main water supply is closed.
- Location: Install the unit in an accessible location within the heating system, typically on the return line or near the boiler.
- Orientation: Observe the flow direction arrow on the unit's body to ensure correct installation. The inlet should connect to the potable water supply, and the outlet to the heating system.
- Connections: Use appropriate sealing materials (e.g., PTFE tape or hemp) on threaded connections to prevent leaks. Tighten connections securely but do not overtighten.
- System Fill: Once installed, slowly open the main water supply and the stopcock on the filling unit. Allow the system to fill and pressurize.
- Leak Check: Carefully inspect all connections for any signs of leakage.
6. Operating Instructions
- Setting Pressure: The desired system pressure is set using the black and yellow adjustment knob located on the top of the unit. Turn the knob clockwise to increase the set pressure and counter-clockwise to decrease it.
- Monitoring Pressure: The integrated pressure gauge displays the current system pressure. Ensure the pressure remains within the recommended range for your heating system, typically between 1.0 and 1.5 bar for most domestic systems.
- Automatic Refill: The unit will automatically open to refill the system if the pressure drops below the set value and close once the set pressure is reached.
- Stopcock: The integrated stopcock allows for manual isolation of the filling unit from the water supply for maintenance or system work. Ensure it is open during normal operation.
7. Maintenance
- Regular Inspection: Periodically check the pressure gauge to ensure the system pressure is stable and within the desired range.
- Filter Cleaning: The unit contains an internal filter to prevent impurities from entering the heating system. Over time, this filter may become clogged. To clean or replace the filter, first close the stopcock and isolate the unit from the water supply. Carefully unscrew the grey cap at the bottom of the unit to access the filter. Clean the filter under running water or replace it if damaged. Reassemble securely.
- Non-Return Valve: The non-return valve prevents backflow into the potable water supply. If continuous filling occurs without a system pressure drop, the non-return valve may be faulty and require inspection by a professional.
8. Troubleshooting
- System Pressure Too Low / No Automatic Fill:
- Check if the main water supply is open.
- Ensure the stopcock on the filling unit is fully open.
- Inspect the internal filter for blockages and clean if necessary.
- Verify the pressure adjustment setting is above the current system pressure.
- System Pressure Too High / Continuous Automatic Fill:
- Check the pressure adjustment setting; it might be set too high.
- A continuous fill often indicates a leak within the heating system, causing constant pressure drops.
- The non-return valve or the filling unit's internal mechanism might be faulty, allowing water to pass continuously. In this case, professional inspection is required.
- Leaks at Connections:
- Ensure all threaded connections are properly sealed and tightened.
- If leaks persist, professional assistance may be needed to re-seal or replace connections.
9. Warranty and Support
For detailed warranty information, technical support, or spare parts, please refer to the official Caleffi website or contact your local Caleffi distributor. It is recommended to retain your purchase receipt as proof of purchase for warranty claims.
