Nordica TermoISOTTA - DSA, Instructions For Installation, Use And Maintenance Manual

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TERMOISOTTA DSA
18
7199701 - IT-EN-DE-FR
lead to serious damage of the entire structure . The system must be filled by means of the loading pipe directly from the open tank
in a way to prevent an excessive pressure of the water network deforming the body of the thermo heating stove.
The system must be kept constantly full of water even during the periods when the use of the thermo-heating stove is not requested. During
the winter, inactivity must be faced with the addition of antifreeze.
3.2. CLOSED expansion Tank system
It is COMPULSORY that the CLOSED expansion Tank system is provided with:
1. A 3 bar SAFETY VALVE : maximum operation pressure allowed for the system is 3 bar (equal to 30 m of the water column). 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. AUTOMATIC THERMOSTATIC MIXING VALVE – (see chapter 3.3 )
3. HEAT DISCHARGE VALVE 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
: safety sensors must be in place on the machine according to that stated in chapter 3.1 . 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 MA NDATORY 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 3.4 ) 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.
3.3. AUTOMATIC THERMOSTATIC MIXER VALVE
- (purchased as OPTIONAL part)
The automatic thermostatic mixer valve finds applications in solid fuel heat generators as it prevents cold water return in the
exchanger Picture 1 at page 50 . 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 efficiency improvement, reduces formation of
smoke condensation and prolongs the boiler life span.
Valves on the market have different calibrations. 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 flow ( M ).
IMPORTANT lack of installation of the device voids the heat exchanger warranty.
3.4. HEAT DISCHARGE VALVE - (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 ( Picture 1 at page 50 / Chap. TECHNICAL DATA SHEETS
-
A
) and the other rot drainage network (
C
). When the safety temperature is reached, the heat discharge valve, 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.
3.5. 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 TECHNICAL DATA SHEETS.
ATTENTION: The filling 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 floodings.
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 .