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La Nordica Termoisotta DSA Manual

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ENGLISH
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 OBLIGATORYPURCHASED 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).

AUTOMATIC THERMAL DISCHARGE VALVE DSAPURCHASED 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.
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