Ravelli Hydro, Use And Maintenance Manual

Use and maintenance manual Touch Radio Hydro

Pag.28 

Rev.0  18/05/2021

EN

Diagram 3 (boiler buffer tank sensor)

Diagram 3 is to be used in a system where both a water buffer tank for the heating system and a DHW boiler are present.

The operating logic is similar to that of Diagram 1. Also in this type of circuit, the boiler water temperature is managed by the stove 

and room temperature by a control unit (not supplied) that controls the buffer tank and any zone valves. The buffer tank temperature 

is controlled by the thermo-stove through a sensor.

The diagram shown here is indicative and may not display all the components required to properly operate the system. Rely on a 

qualified thermal technician for the hydraulic system design.

System water characteristics

The chemical-physical characteristics of the system and replenishing water are important for the proper operation and service life 

of the thermo-stove; 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.

Therefore, we invite you to check the quality and hardness of the water with your supplier.

We recommend the installation of a softener (limescale filter) in correspondence with the system loading. This precaution becomes 

essential in the conditions listed below: 

• 

medium and high water hardness (> 15 ° f)

• 

considerable quantities of make-up water or subsequent fillings

• 

plants of a certain complexity and size.

⚠

National and local laws may require the use of water softening systems. The technician responsible for the plumbing 

installation is invited to check what is reported in the regulations in force.

System water load

Once the plumbing connections have been completed, the appliance and its system can be LOADED.

To facilitate the escape of air, unscrew the cap of the automatic vent valve (Jolly valve) of the thermo stove and open the vent valves 

in the system. Bleed the air even after the first hours of operation and, if necessary, also periodically (for example in the event of 

noises and gurgling).

The filling pressure of the COLD system must be 1 bar (100 kPa). In order to ensure correct operation of the thermo stove, the HOT 

pressure must be approximately 1.5 bar (150 kPa).

If during operation the system pressure drops to values below the minimum indicated above, the user must bring it back to the initial 

value by acting on the filling tap.

It is possible to load the system and keep it at the correct pressure also by means of a special automatic filling unit.

Periodically check the system water pressure, using the appropriate function on the display.

Stufa a Pellet

LEGEND

1- Pellet stove

2- Distribution manifolds

3- Radiators

4- Thermometer

5- Pressure gauge

6- Anti-condensation valve

 7- Check valve

 8- Group of direct distribution

 9- Thermostatic distribution unit

10- Radiant panel (underfloor heating)

11- Shut-off valve

12- Thermostat

13- Expansion vessel (tank)

14- Pump station for solar thermal system

15- Solar thermal collector

16- Thermostatic mixing valve

17- Booster pump

18- Buffer tank

19- Motorised three-way valve with spring return

20- Gas boiler

21- Power separation system

22- Motorised three-way valve

23- DHW storage

24- Flow switch