Bedienungsanleitung La Nordica Termoisotta DSA (Seite 24 von 101) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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CLOSED EXPANSION TANK SYSTEM

It is COMPULSORY that the CLOSED expansion Tank system is provided with:

1. A SAFETY VALVE - maximum operation pressure allowed for the system is : see DECLARATION OF PERFORMANCE - CE MARKING

INFORMATION. Higher pressures can cause deformation and breakage of the boiler body. ATTENTION: The inside diameter of the

supply pipe which connects the thermoproduct with the security valve must be equal to the internal diameter of the supply junction

present in the thermoproduct. The above mentioned connection pipe must be without siphoning parts.

2. ANTI-CONDENSATION MIXING VALVE – (see chapter)

3. AUTOMATIC THERMAL DISCHARGE VALVE DSA or TEMPERATURE SAFETY RELIEF VALVE, with double safety sensor

4. CLOSED EXPANSION Tank can be installed on the thermo product return pipe. ATTENTION: The inside diameter of the return pipe

which connects the thermoproduct with the closed expansion vessel must be equal to the internal diameter of the return junction

present in the thermoproduct. The above mentioned connection pipe must be without siphoning parts.

5. PUMP CONTROL THERMOSTAT

6. NOISE ALARM ACTIVATION THERMOSTAT

7. NOISE ALARM

8. TEMPERATURE INDICATOR

9. PRESSURE INDICATOR

10. PUMP SYSTEM

ATTENTION: temperature safety sensors must be in place on the machine or at a distance no greater than 30 cm from the ow

connection of the thermo-product. Whenever the thermo products lack a device, those missing can be installed on the thermo

product ow pipe, within a distance no greater than 1m from the thermo product. . All those parts must no have for any reason

meditate intercept bodies that could accidentally exclude them and must be placed in rooms which are protected from frost. On

the contrary, if they freeze, the boiler body could break or even explode.

IT IS MANDATORY that the thermo products for domestic heating inserted in CLOSED Tank heating systems, must be internally equipped,

with a cooling circuit, prepared by the unit manufacturer, which is activated by a thermal safety valve (see chapter VAST) which does not

require auxiliary power and can guarantee that the standard set temperature limit is not exceeded. Connection between the power supply

unit and the valve must be free from interceptions. Cooling circuit upstream pressure must be at least 1,5 bar.

ANTICONDENSATION MIXING VALVE OBLIGATORY PURCHASED AS OPTIONAL PART

The Anti-condensation mixing valve nds applications in solid fuel heat generators as it prevents cold water return in the exchanger (chap.

DIMENSIONS). Routes 1 and 3 are always open and, along with the pump installed on the return (R), they guarantee water circulation inside

the biomass boiler exchanger (CB). An elevated return temperature, allows eciency improvement, reduces formation of smoke condensation

and prolongs the boiler life span.

Valves on the market have dierent calibrations. La NORDICA advises use of model 55°c with 1” hydraulic connections. Once the valve

calibration temperature is reached, route 2 opens and the boiler water goes to the system via the ow (M).



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AUTOMATIC THERMAL DISCHARGE VALVE DSA PURCHASED AS OPTIONAL PART

Solid fuel thermo products must be installed with safety devices determined by laws in vigour. For this reason the thermo products is equipped

with a heat discharge coil.

The heat discharge coil must have one side connected to the water network (chap. DIMENSIONS / chap. DIMENSIONS - A) and the other

rot drainage network (C). When the safety temperature is reached, the automatic thermal discharge valve DSA, the bulb of which is to be

connected to attachment B, enables the intake of cold water in the boiler coil, discharging the excess heat out of pipe C towards a conveniently

installed drain. Cooling circuit upstream pressure must be at least 1,5 bar.

WARNING: We cannot be made liable for a wrong operation of the plant, when it does not comply with the provisions of

these instructions or when it uses additional products not suitable for this device (see chapter Thermostatic Valve VAST

TECHNICAL DATA SHEET).

SYSTEM CONNECTION AND FILLING

Some examples, purely indicative of the installation, are reported at chapter INSTALLATION LAYOUT, while the connections to the

thermoproduct are reported at chapter DIMENSIONS .

ATTENTION: The lling of the system must take place exclusively by the natural fall of the water from the open expansion

tank through the feed pipe in order to avoid that a too high water system grid pressure could change or cause the explosion

of boiler body.

During this phase, open all the bleed valves of the radiators to prevent the formation of air sacks, checking the outlet of water to avoid

unpleasant oodings.

The watertight test of the installation is performed with the pressure of expansion tank open.



The installation must always be full of water even when the thermo-product is not used. During winter season the non use

has to be faced by adding antifreeze substances.

La Nordica Termoisotta DSA Seite 24

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