Biofell Cascade
601130040 [Revision 1502.00] [subject to changes with no previous notice]
Page 5 of 20
Figure 4
2.2
Filling the System
2.2.1
General Notes
To prevent lime scale damage to the DHW exchanger, the feed water hardness should not exceed 15°fH. In any case it is advisable to
check the water used, and install the appropriate device for its treatment.
To fill up the system, clean tap water must be used only. If adding antifreeze chemicals, a hydraulic breaker must be installed in the filling
system, to allow separation between the heating circuit and the water circuit.
After making the hydraulic connections, complete the installation as follows:
Check that the pump is not blocked.
Check that the automatic air vent is loose to allow gas evacuation.
Open the DHW’s main circuit input.
Unscrew the pump cap to remove any air bubbles, and close it when water comes out of it.
Open the traps on any devices connected to the circuit, and control the process of removing any air. When water comes out, close radiator straps.
Check the gauge so that installation pressure reaches a value of about 1.5 bar.
If after performing the operations indicated, a decrease in pressure is detected, open the fill again until the gauge pressure reaches 1.5 bar.
Ensure that the fill is securely closed.
2.2.2
Water Features
To ensure that the device should work properly, take into account the following basic rules:
Make sure there are no leaks, and closing any large or evident ones.
If there is an automatic filling system, a counter should be available to determine the size of any leaks.
To fill the system soft water should be used to reduce the total hardness. Furthermore, water must be treated to keep the pH value within corrosion-
preventing limits.
For new installations or boiler replacements, installations must be effectively filtered or screened to protect the boiler from impurities and air.
Ensure that no water come out of the system during maintenance operations, even though the amount seem insignificant: for example, it is
recommended that the system incorporate cutting keys allowing filter cleaning.
Before connecting the boiler, the system’s water should always be tested to check if the values shown advice emptying the system, using existing
waters or performing a chemical cleaning (if the system is particularly dirty or clogged) before filling it with treated water.
Water treatment
