Plumbing Connections; System Water Filling; System Water Characteristics - Ravelli HR EVO 300 SMART Manuel D'installation, D'utilisation Et D'entretien

Plumbing connections

The heating capacity of the unit must be previously established by calculating the building's heat requirement according to current
regulations, by contacting a specialised technician.
According to Italian Standard UNI 10412-2 (2009) and proper installation technique, a heating system must be provided with all the
adjustment, control and safety components to ensure proper and safe operation, as well as shutoff and non-return valves to allow the
boiler to be isolated from the system in case of maintenance and/or checks.
There are two types of systems: CLOSED VESSEL system and OPEN VESSEL system. In the present case, both types are
compatible with our unit, provided all the adjustment, control and safety components required by the current regulations on installation
are installed.
The pellet boiler has an internal heating water circuit complete with high efficiency circulating pump, safety valve, air vent, temperature
probes and pressure transducer.
If the heating system is managed in zones a multi-zone controller, available on request, must be installed.
In solid fuel boilers, to avoid the return of cold water in the heating chamber during the heating phase, it is advisable to install an
AUTOMATIC THERMOSTATIC VALVE (available on request) in the system to improve combustion efficiency and boiler life and also
reduce the condensation of fumes in the flueways, with less deposits and tars.
Before connecting the boiler to the water circuit, thoroughly clean all system pipes to remove any residuals or machining residuals
that could compromise the proper operation of the adjustment, control and safety components.
During boiler transport, the rings and respective seals in the water system may come loose and/or break, causing
water leaks during operation; therefore make sure to check the tightening of the circulating pump and heating
chamber connection rings and vent the residual air during water filling and after the first hours of operation.

System water filling

After carrying out the plumbing connections, it is possible to FILL the unit and system:
• open all the air vent valves of the radiators - manifolds - boiler and system;
• open the water filling cock gradually, making sure the vent valves work properly;
• fill the system slowly, to allow proper and complete evacuation of the air from the vent, bringing the circuit under pressure (for a
closed vessel system from 1.1 to 1.5 bar);
• when finished, close the filling cock and make sure all vent valves have discharged the air from the system;
• to display the boiler's water circuit pressure, just press the control panel button P5 for 3 seconds.
The creation of a heating system with installation of the boiler must comply with all the applicable National,
Regional, Provincial and Local regulations in the country where the system is installed.

System water characteristics

The chemical-physical characteristics of the system and replenishing water are important for the proper operation and service life
of the boiler; in fact, with the use of low quality water the most frequent problem is due to scale, which causes a reduction in heat
exchange and generates corrosion.
It is therefore advisable to check the water quality and, in the conditions listed below, provide for treatment:
• very hard water ( >20°f );
• considerable amounts of replenishing water or subsequent fillings;
• systems of some complexity and size.
HR EVO 300-350 SMART
use and maintenance manual
Rev.0 18/12/2019
ENG
Pag.71